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Fluke 279FC/iFlex Wireless True RMS Thermal Multimeter with iFlex

Model: 279FC/IFLEX | UPC: 95969794466

Fluke 279FC/iFlex Wireless True RMS Thermal Multimeter with iFlex-


Downloads: datasheet manual

Fluke 279FC/iFlex Wireless True RMS Thermal Multimeter with iFlex

Model: 279FC/IFLEX

With the ability to scan, this thermal multimeter allows users to find electrical problems from a distance. This tool also verifies hot spots on high-voltage equipment and transformers and identifies heating of fuses, wires, insulators, connectors, splices, and switches. Additionally, it comes equipped with the iFlex probe.

With the ability to scan, this thermal multimeter allows users to find electrical problems from a distance. This tool also verifies hot spots on high-voltage equipment and transformers and identifies heating of fuses, wires, insulators, connectors, splices, and switches. Additionally, it comes equipped with the iFlex probe.

Your Price $1408.00 CAD
Availability 3 in Stock
Quantity

Add In-House ISO Certified Calibration to your 279FC/IFLEX

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Fluke 279FC/IFLEX Offers

Find. Repair. Validate. Report.

Find, repair, validate, and report many electrical issues quickly and confidently with this full-featured digital multimeter with integrated thermal imaging.

Features

  • Full-featured multimeter with built-in thermal imager
  • 15 measurement functions including: AC voltage with low-pass filter, DC voltage, Resistance, Continuity, Capacitance, Diode test, Min/Max/Avg, AC current (with iFlex), Frequency
  • Thermal imaging reveals many electrical issues quickly and safely, eliminating the need for time-consuming testing and validation
  • Two-in-one tool is designed to increase productivity– no need to go back to the truck or office to retrieve a shared camera or wait for the thermographer do more in less time!
  • iFlex expands your measurement capabilities get into tight, hard to reach spaces for current measurement (up to 2500 A AC)
  • Designed for durability, built to withstand a 9.8' (3 m) drop, double insulated with raised rubber holster for increased protection
  • Save measurements and images while communicating wirelessly with a smart phone up to 20 feet/6.1 m away (no obstructions)
  • Rechargeable lithium ion battery allows for a for a full work day (10+ hours) under normal conditions
  • Auto power off to save battery power
  • CAT III 1000 V, CAT IV 600 V measurement category

Locate the problem immediately

Scanning with this thermal multimeter allows users to locate electrical issues rapidly and from a safe distance. Additionally, it is an ideal troubleshooting tool for electrical equipment, due to it's the ability to verify hot spots on high-voltage equipment and transformers and detect heating of fuses, wires, insulators, connectors, splices, and switches.

Expanded functionality

Compatible with iFlex® (a flexible current clamp) to expand your measurement capabilities and get into tight, hard to reach spaces for current measurement (up to 2500 A AC). The large full-color LCD screen makes for easier and clearer viewing of images and readings. The 10 hour and more rechargeable battery keeps you going all day long under normal conditions.

Communicate your results

With built-in Fluke Connect®, transmit results wirelessly to a smartphone and save time on reporting to validate work is complete. Troubleshoot better by instantly trending and monitoring measurements live on your smartphone screen. Create and email reports right from the field.

Applications

  • Electrical

Fluke 279FC/IFLEX Specifications

AC Voltage
Range/Resolution 600.0/0.1 mV
6.000/0.001 V
60.00/0.01 V
600.0/0.1 V
1000/1 V
Accuracy 45 to 65 Hz: 1.0 % + 3
65 to 200 Hz: 4.0% + 3
200 to 500 Hz: 15% + 3
AC mV
Range/Resolution 600.0/0.1 mV
Accuracy 45 to 500 Hz: 1.0% + 3
DC Voltage
Range/Resolution 6.000/0.001 V
60.00/0.01 V
600.0/0.1 V
1000/1 V
Accuracy 6, 60, 600 V: 0.09% + 2
1000 V: 0.15% + 2
DC mV
Range/Resolution 600.0/0.1 mV
Continuity
Range/Resolution 600/1 Ω
Accuracy Meter beeps at <25 Ω, beeper detects opens or shorts of 600 µs or longer
Resistance
Range/Resolution 600.0/0.1 Ω
6.000/0.001 kΩ
60.00/0.01 kΩ
600.0/0.1 kΩ
6.000/0.001 MΩ
50.00/0.01 MΩ
Accuracy 600 Ω: 0.5 % + 2
6 to 600 kΩ: 0.5 % + 1
50 MΩ: 1.5 % + 3
Diode Test
Range/Resolution 2.000/0.001 V
Accuracy 1% + 2
Capacitance
Range/Resolution 1000/1 nF
10.00/0.01 µF
100.0/0.1 µF
9999/1 µF
Accuracy 1000 nF to 100 µF: 1.2% + 2
9999 µF: 10% typical
AC Current
Range/Resolution 999.9/0.1 A
2500/1 A (with iFlex)
Accuracy 45 to 500 Hz: 3.0% + 5
Frequency
Range/Resolution 99.99/0.01 Hz
999.9/0.1 Hz
Accuracy 0.1% + 1
Input Characteristics
AC Voltage Input impedance (nominal): >10 MΩ <100 pF
Common mode rejection ratio (1 kΩ unbalance): >60 dB, DC to 60 Hz
Overload protection: 1100 V rms
DC Voltage Input impedance (nominal): >10 MΩ <100 pF
Common mode rejection ratio (1 kΩ unbalance): >120 dB at DC, 50 Hz or 60 Hz
Normal mode rejection: >60 dB at 50 Hz or 60 Hz
Overload protection: 1100 V rms
AC mV/DC mV Input impedance (nominal): >10 MΩ <100 pF
Common mode rejection ratio (1 kΩ unbalance): >120 dB at DC, 50 Hz or 60 Hz
Normal mode rejection: >60 dB at 50 Hz or 60 Hz
Overload protection: 1100 V rms
Resistance/Capacitance Open circuit test voltage: <2.7 V dc
Full scale voltage to 6 MΩ: <0.7 V dc
Full scale voltage 50 MΩ: <0.9 V dc
Typical short circuit current: <350 mA
Overload protection: 1100 V rms
Continuity/Diode Test Open circuit test voltage: <2.7 V dc
Full scale voltage: 2.000 V dc
Typical short circuit current: <1.1 mA
MIN/MAX Recording Accuracy
AC Functions 40 counts for changes > 900 ms in duration
DC Functions 12 counts for changes > 350 ms in duration
Infrared Camera Temperature
Temperature Range 14 to 392°F (-10 to 200°C )
Measurement Resolution 0.1°C
Temperature Measurement Yes, centerpoint
Accuracy ±5 °C or ±5 %, whichever is greater, at 25 °C (ambient) for target temperatures below 20 °C, add 0.05 °C for each °C
Emissivity 0.95 fixed
Image Performance
Resolution 102 x 77
Image Capture Frequency 8 Hz
Detector Type Uncooled vanadium oxide
Thermal sensitivity (NETD) ≤200 mK
Infrared Spectral Band 7.5 to 14 µm
Distance to Spot 162:1
Field of View 36 x 27°
Focus Mechanism Fixed focus
Image Presentation
Palette Ironbow
Level and Span Auto
Image Capture and Data Storage
Image Capture Image available for review before a save
Storage Medium Internal memory stores up to 100 images
Image Transfer Fluke Connect®/SmartView®
File Format is2
Display Size 3.5" (8.9 cm) diagonal
Click here for complete specifications on the Fluke 279FC/IFLEX

What's included with the Fluke 279FC/IFLEX

  • Multimeter
  • Current Probe
  • Test Leads
  • Hanging Strap
  • Carrying Case
  • Rechargeable Lithium Ion Battery and Charger
  • Three-Year Standard Warranty
This product features Fluke Connect Technology

See it. Save it. Share it. All the facts, right in the field.

Fluke engineers have delivered an innovative mobile platform and tool that helps solve everyday problems, allowing you to instantly document measurements, retrieve historical data, and share live measurements with your team. All handled by the Android™ or iOS smart phone you already carry.

Fluke Connect with ShareLive™ video call is the only wireless measurement system that lets you stay in contact with your entire team without leaving the field. The Fluke Connect mobile app is works with over 20 different Fluke products - the largest suite of connected test tools in the world.

Make the best decisions faster than ever before by viewing temperature, mechanical, electrical and vibration measurements for each equipment asset in one place. Get started saving time and increasing your productivity.


Fluke Connect Features:

  • TrendIt™ Graphs: Use graphing to show changes in measurements, allowing you to graph and show problems instantly.
  • EquipmentLog™ History: Access equipment history building a database of equipment health and baselines with cloud backup.
  • ShareLive™ Video Calls: Save, collaborate and share measurements instantly with your team anytime, from anywhere.
  • AutoRecord™ Measurements: Instantly save measurements to your phone with Cloud backup.
  • Fluke Cloud™ Storage: Securely access equipment records anywhere, anytime.

Fluke Connect Benefits:

  • Maximize uptime
  • Minimize maintenance costs
  • Better assessments with accurate records
  • Higher efficiency with less walking around; no notebook and excel needed
  • Share troubleshooting knowledge live
  • Create and share helpful content in the field
  • Access to Fluke digital product manuals means no need to carry manuals in the field
  • Keep organized manually entered measurements

The Fluke 279 FC True-RMS Thermal Multimeter Overview


In this introductory video, the viewer will receive an overview of the main features of this True RMS thermal multimeter. Additionally, this instrument is Fluke Connect compatible.

Introducing the Fluke 279 FC True RMS Thermal Multimeter


This introductory video will go over the main features of this True RMS thermal multimeter. Easily detect a heat map with this unit. Additionally, it comes equipped if a flexible probe which allows you to take measurements in tight and awkward areas of up to 2500 amps.

How To Set Up the Fluke iFlex Flexible Current Probe


This video is designed to demonstrate how to set up and use your Fluke iFlex flexible current probe. It provides users to capability to take measurements in tight areas. Additionally, it is compatible with a variety of Fluke products.

Using the Fluke iFlex Flexible Current Probe in Tight Areas


This video demonstrates how this flexible current probe is used for awkward and tight spaces. For this specific scenario, it is paired with the Fluke 381. Additionally, it is also compatible with a variety of Fluke products.

Getting to know the Fluke 279FC/iFlex True-rms Thermal Multimeter with iFlex


This video will serve as an overview of the Fluke 279FC/iFlex True-rms Thermal Multimeter.

Using the Fluke iFlex Flexible Current probe with the Fluke 376 FC True RMS Clamp Meter


This video demonstrates the versatility of the Fluke iFlex flexible current probe. Additionally, it is compatible with a variety of Fluke meters.

Multimeter measurements on adjustable speed drives

In the past, motor repair meant dealing with traditional three-phase motor failures that were largely the result of water, dust, grease, failed bearings, misaligned motor shafts, or just plain old age. But motor repair has changed in a big way with the introduction of electronically controlled motors, more commonly referred to as adjustable speed drives (ASDs). These drives present a unique set of measurement problems that can vex the most seasoned pro. Thanks to new technology, now for the first time you can take accurate electrical measurements with a DMM during the installation and maintenance of a drive and diagnose bad components and other conditions that may lead to premature failure.

Troubleshooting philosophy

Technicians use many different methods to troubleshoot an electrical circuit, and a good troubleshooter will always find the problem - eventually. The trick is tracking it down quickly and keeping downtime to a minimum. The most efficient troubleshooting procedure begins at the motor and then works systematically back to the electrical source, looking for the most obvious problems first. A lot of time and money can be wasted replacing perfectly good parts when the problem is simply a loose connection. As you go, take care to take accurate measurements. Nobody takes inaccurate measurements on purpose, but it's easy to do, especially when working in a high energy, noisy environment like an ASD. Likewise, choosing the right test tools for troubleshooting the drive, the motor, and the connections is of utmost importance. This is especially true when taking voltage, frequency and current measurements on the output side of the motor drive. But until now, there hasn't been a digital multimeter on the market able to accurately measure ASDs. Incorporates a selectable low pass filter* that allows for accurate drive output measurements that agree with the motor drive controller display indicator. Now, technicians won't have to guess whether the drive is operating correctly and delivering the correct voltage, current or frequency for a given control setting.

Drive measurements

Input side measurements

Any good quality True RMS multimeter can verify proper input power to an ASD. The input voltage readings should be within 1% of one another when measured phase to phase with no load. A significant unbalance may lead to erratic drive operation and should be corrected when discovered.

Output side measurements

On the flip side, a regular True RMS multimeter can't reliably read the output side of a pulse width modulated (pwm) motor drive, because the ASD applies pulse width modulated nonsinusoidal voltage to the motor terminals. A True RMS DMM reads the heating effect of the non-sinusoidal voltage applied to the motor, while the motor controller's output voltage reading only displays the rms value of the fundamental component (typically from 30 Hz to 60 Hz). The causes of this discrepancy are bandwidth and shielding. Many of today's True RMS digital multimeters have bandwidths out to 20 kHz or more, causing them to respond not only to the fundamental component, which is what the motor really responds to, but to all of the high frequency components generated by the pwm drive. And if the DMM isn't shielded for high frequency noise, the drive controller's high noise levels make the measurement discrepancies even more extreme. With the bandwidth and shielding issues combined, many True RMS meters display readings as much as 20 to 30% higher than what the drive controller is indicating. With the incorporated selectable low pass filter, allows troubleshooters to take accurate voltage, current and frequency measurements on the output side of the drive at either the drive itself or the motor terminals. With the filter selected, the readings for both voltage and frequency (motor speed) should agree with the associated drive control display indications, if available. The low pass filter also allows for accurate current measurements when used with Hall-effect type clamps. All of these measurements are especially helpful when taking measurements at the motor location when the drive's displays are not in view.

Taking safe measurements

Before taking any electrical measurements, be sure you understand how to take them safely. No test instrument is completely safe if used improperly, and many test instruments are not appropriate for testing adjustable speed drives. Also make sure to use the appropriate personal protective equipment (PPE) for your specific working environment and measurements. If at all possible, never work alone.

Safety ratings for electrical test equipment

ANSI and the International Electrotechnical Commission (IEC) are the primary independent organizations that define safety standards for test equipment manufacturers. The IEC 61010 second edition standard for test equipment safety states two basic parameters: a voltage rating and a measurement category rating. The voltage rating is the maximum continuous working voltage the instrument is capable of measuring. The category ratings depict the measurement environment expected for a given category. Most three-phase ASD installations would be considered a CAT III measurement environment, with power supplied from either 480V or 600V distribution systems. When using a DMM for measurements on these high energy systems, make sure it's rated at a minimum for CAT III 600V and preferably for CAT IV 600V/CAT III 1000V. The category rating and voltage limit are typically found on the front panel, at the input terminals. Dual-rated CAT IV 600V and CAT III 1000V. Refer to the ABC's of DMM Safety* from Fluke for additional information on category ratings and taking safe measurements.

How to take measurements

Now let's put the multimeter to the test. The measurements in the following procedure are designed to be made on a 480 volt 3 phase drive control at the control panel terminal strips. These procedures would also be valid for lower voltage 3 phase drives powered by either single or 3 phase supply voltages. For these tests the motor is running at 50 Hz.

Input voltage

To measure the ac voltage supply to the input side of the drive at the drive:

  • Select the ac voltage function.
  • Connect the black probe to one of the three phase input terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase input terminals and record the reading.
  • Leaving the black probe on the reference phase now move the red probe to the third phase input and record this reading.
  • Make sure there's no more than a 1% difference between these two readings.

Input current

Measuring the input current generally requires a current clamp accessory. In most cases, either the input current exceeds the maximum current measurable by the current function, or it isn't practical to "break the circuit" to take an in-line series current measurement. Regardless of clamp type, insure that all readings are within 10% of each other for proper balance.

Transformer type clamp (i200, 80i-400, 80i-600A)

  • Connect the clamp to the common and 400 mA input jacks.
  • Select the mA/A AC function.
  • Place the clamp around each of the input supply phase cables in succession, recording each of the readings as they are taken. Since these clamps output one milliamp per amp, the milliamp readings shown on the display are the actual phase current readings in amps.

Hall Effect type (AC/DC) clamp (i410,i-1010)

  • Connect the clamp to the common and V/W input jacks.
  • Select the AC voltage function.
  • Press the yellow button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the drive controller. Once the low pass filter is enabled, the meter will be in the 600 mV manual range mode.
  • Place the clamp around each of the input supply phase cables in succession, recording each of the readings as they are taken. Since these clamps output one millivolt per amp, the millivolt readings shown on the display are the actual phase current readings in amps.

Figure 1. Output voltage reading without using the low pass filter.


Figure 2. Output voltage reading with low pass filter enabled.

Output voltage

To measure the AC output voltage at either the drive or the motor terminals:

  • Plug the black test lead into the common jack and the red test lead into the V/W jack.
  • Select the AC voltage function.
  • Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase output voltage or motor terminals.
  • Press the yellow button to enable the low pass filter. Now record the reading.
  • Leaving the black probe on the reference phase, now move the red probe to the third phase output voltage or motor terminal and record this reading.
  • Make sure that there's no more than a 1% difference between these two readings (see Figure 2). The readings should also agree with the controller display, panel if available.
  • If the low pass filter isn't enabled, the output voltage readings may be 10 to 30% higher, as on a regular DMM (see Figure 1).

Figure 3. Output frequency (motor speed) without the low pass filter.


Figure 4. Output frequency (motor speed) using the low pass filter.

Motor speed (Output frequency using voltage as a reference)

To determine motor speed, simply take a frequency measurement while using the low pass filter. The measurement can be made between any two of the phase voltage or motor terminals.

  • Plug the black test lead into the common jack and the red test lead into the V/W jack.
  • Select the ac voltage function.
  • Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase output voltage or motor terminals.
  • Press the yellow button to enable the low pass filter.
  • Press the Hz button. The displayed reading in hertz will be the motor speed (see Figure 3). This measurement couldn't be made successfully without the low pass filter (see Figure 4).

Output current

TAs with input current, measuring the output current generally requires a current clamp accessory. Once again, regardless of clamp type, insure that all readings are within 10% of each other for proper balance.

Transformer type clamp (i200, 80i-400, 80i-600A)

  • Connect the clamp to the common and 400 mA input jacks.
  • Select the mA/A ac function.
  • Place the clamp around each of the output phase cables in succession, recording each of the readings as they're taken. Since these clamps output 1 milliamp per amp, the milliamp readings shown on the display are the actual phase current readings in amps.

Figure 5. Output current reading without using the low pass filter.


Figure 6. Output current reading with low pass filter enabled.

Hall Effect type (AC/DC) clamp (i410,i-1010)

  • Connect the clamp to the common and V/W input jacks.
  • Select the ac voltage function.
  • Press the yellow button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the drive controller. Once the low pass filter is turned on, the meter will be in the 600 mV manual range mode.
  • Place the clamp around each of the output phase cables in succession, recording each of the readings as they are taken (see Figure 6). Since these clamps output 1 millivolt per amp, the millivolt readings shown on the 87-V display are the actual phase current readings in amps. This measurement would not be possible without the low pass filter (see Figure 5).

Motor speed (Output frequency using current as a reference)

For motors that pull at least 20 amps of running current, motor speed can be determined by taking a frequency measurement with current clamps. Until now, noise issues have prevented accurate readings using hall effect type clamps. Here's how the low pass filter makes it possible.

Motor speed using a Hall Effect type (AC/DC) clamp (i410,i-1010)

  • Connect the clamp to the common and V/W input jacks.
  • Select the ac voltage function.
  • Press the yellow button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the drive controller. Once the low pass filter has been turned on, the meter will be in the 600 mV manual range mode.
  • Place the clamp around one of the output phase cables. Verify that the multimeter is reading a current of at least 20 amps (20 mV in the display).
  • Press the Hz button. The readings now display the motor speed as a frequency measurement.

Motor speed using a transformer type clamp (i200, 80i-400, 80i-600A)

  • Connect the clamp to the common and 400 mA input jacks.
  • Select the mA/A AC function.
  • Place the clamp around one of the output phase cables. Verify that the multimeter is reading a current of at least 20 amps (20mA in the display).
  • Press the Hz button. The readings now display the motor speed as a frequency measurement.

DC Bus measurements

A healthy dc bus is a must for a properly operating motor drive. If the bus voltage is incorrect or unstable, the converter diodes or capacitors may be starting to fail. The DC bus voltage should be approximately 1.414 times the phase to phase input voltage. For a 480 volt input, the DC bus should be approximately 679 VDC. The DC bus is typically labeled as DC+, DC- or B+, Bon the drive terminal strip. To measure the DC bus voltage:

  • Select the dc voltage function.
  • Connect the black probe to either the DC- or B- terminal.
  • Connect the red probe to the DC+ or B+ terminal. The bus voltage should agree with the example mentioned above and be relatively stable. To check the amount of ac ripple on the bus, switch the 7V's function switch to the vac function. Some small drives don't allow external access to the DC bus measurement without disassembling the drive. If you can't access the DC bus, use the peak min max function on the multimeter to measure the dc bus voltage via the output voltage signal.
  • Plug the black test lead into the common jack and the red test lead into the V/½ jack.
  • Select the AC voltage function.
  • Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase output voltage or motor terminals.
  • Press the MIN MAX button.
  • Press the (Peak min max) button.
  • The displayed reading in Peak min max will be the DC bus voltage.

Customer Reviews for the Fluke 279FC/IFLEX

Ask a question about Fluke 279FC/iFlex Wireless True RMS Thermal Multimeter with iFlex

Fluke 279FC/IFLEX Offers

Find. Repair. Validate. Report.

Find, repair, validate, and report many electrical issues quickly and confidently with this full-featured digital multimeter with integrated thermal imaging.

Features

  • Full-featured multimeter with built-in thermal imager
  • 15 measurement functions including: AC voltage with low-pass filter, DC voltage, Resistance, Continuity, Capacitance, Diode test, Min/Max/Avg, AC current (with iFlex), Frequency
  • Thermal imaging reveals many electrical issues quickly and safely, eliminating the need for time-consuming testing and validation
  • Two-in-one tool is designed to increase productivity– no need to go back to the truck or office to retrieve a shared camera or wait for the thermographer do more in less time!
  • iFlex expands your measurement capabilities get into tight, hard to reach spaces for current measurement (up to 2500 A AC)
  • Designed for durability, built to withstand a 9.8' (3 m) drop, double insulated with raised rubber holster for increased protection
  • Save measurements and images while communicating wirelessly with a smart phone up to 20 feet/6.1 m away (no obstructions)
  • Rechargeable lithium ion battery allows for a for a full work day (10+ hours) under normal conditions
  • Auto power off to save battery power
  • CAT III 1000 V, CAT IV 600 V measurement category

Locate the problem immediately

Scanning with this thermal multimeter allows users to locate electrical issues rapidly and from a safe distance. Additionally, it is an ideal troubleshooting tool for electrical equipment, due to it's the ability to verify hot spots on high-voltage equipment and transformers and detect heating of fuses, wires, insulators, connectors, splices, and switches.

Expanded functionality

Compatible with iFlex® (a flexible current clamp) to expand your measurement capabilities and get into tight, hard to reach spaces for current measurement (up to 2500 A AC). The large full-color LCD screen makes for easier and clearer viewing of images and readings. The 10 hour and more rechargeable battery keeps you going all day long under normal conditions.

Communicate your results

With built-in Fluke Connect®, transmit results wirelessly to a smartphone and save time on reporting to validate work is complete. Troubleshoot better by instantly trending and monitoring measurements live on your smartphone screen. Create and email reports right from the field.

Applications

  • Electrical

Fluke 279FC/IFLEX Specifications

AC Voltage
Range/Resolution 600.0/0.1 mV
6.000/0.001 V
60.00/0.01 V
600.0/0.1 V
1000/1 V
Accuracy 45 to 65 Hz: 1.0 % + 3
65 to 200 Hz: 4.0% + 3
200 to 500 Hz: 15% + 3
AC mV
Range/Resolution 600.0/0.1 mV
Accuracy 45 to 500 Hz: 1.0% + 3
DC Voltage
Range/Resolution 6.000/0.001 V
60.00/0.01 V
600.0/0.1 V
1000/1 V
Accuracy 6, 60, 600 V: 0.09% + 2
1000 V: 0.15% + 2
DC mV
Range/Resolution 600.0/0.1 mV
Continuity
Range/Resolution 600/1 Ω
Accuracy Meter beeps at <25 Ω, beeper detects opens or shorts of 600 µs or longer
Resistance
Range/Resolution 600.0/0.1 Ω
6.000/0.001 kΩ
60.00/0.01 kΩ
600.0/0.1 kΩ
6.000/0.001 MΩ
50.00/0.01 MΩ
Accuracy 600 Ω: 0.5 % + 2
6 to 600 kΩ: 0.5 % + 1
50 MΩ: 1.5 % + 3
Diode Test
Range/Resolution 2.000/0.001 V
Accuracy 1% + 2
Capacitance
Range/Resolution 1000/1 nF
10.00/0.01 µF
100.0/0.1 µF
9999/1 µF
Accuracy 1000 nF to 100 µF: 1.2% + 2
9999 µF: 10% typical
AC Current
Range/Resolution 999.9/0.1 A
2500/1 A (with iFlex)
Accuracy 45 to 500 Hz: 3.0% + 5
Frequency
Range/Resolution 99.99/0.01 Hz
999.9/0.1 Hz
Accuracy 0.1% + 1
Input Characteristics
AC Voltage Input impedance (nominal): >10 MΩ <100 pF
Common mode rejection ratio (1 kΩ unbalance): >60 dB, DC to 60 Hz
Overload protection: 1100 V rms
DC Voltage Input impedance (nominal): >10 MΩ <100 pF
Common mode rejection ratio (1 kΩ unbalance): >120 dB at DC, 50 Hz or 60 Hz
Normal mode rejection: >60 dB at 50 Hz or 60 Hz
Overload protection: 1100 V rms
AC mV/DC mV Input impedance (nominal): >10 MΩ <100 pF
Common mode rejection ratio (1 kΩ unbalance): >120 dB at DC, 50 Hz or 60 Hz
Normal mode rejection: >60 dB at 50 Hz or 60 Hz
Overload protection: 1100 V rms
Resistance/Capacitance Open circuit test voltage: <2.7 V dc
Full scale voltage to 6 MΩ: <0.7 V dc
Full scale voltage 50 MΩ: <0.9 V dc
Typical short circuit current: <350 mA
Overload protection: 1100 V rms
Continuity/Diode Test Open circuit test voltage: <2.7 V dc
Full scale voltage: 2.000 V dc
Typical short circuit current: <1.1 mA
MIN/MAX Recording Accuracy
AC Functions 40 counts for changes > 900 ms in duration
DC Functions 12 counts for changes > 350 ms in duration
Infrared Camera Temperature
Temperature Range 14 to 392°F (-10 to 200°C )
Measurement Resolution 0.1°C
Temperature Measurement Yes, centerpoint
Accuracy ±5 °C or ±5 %, whichever is greater, at 25 °C (ambient) for target temperatures below 20 °C, add 0.05 °C for each °C
Emissivity 0.95 fixed
Image Performance
Resolution 102 x 77
Image Capture Frequency 8 Hz
Detector Type Uncooled vanadium oxide
Thermal sensitivity (NETD) ≤200 mK
Infrared Spectral Band 7.5 to 14 µm
Distance to Spot 162:1
Field of View 36 x 27°
Focus Mechanism Fixed focus
Image Presentation
Palette Ironbow
Level and Span Auto
Image Capture and Data Storage
Image Capture Image available for review before a save
Storage Medium Internal memory stores up to 100 images
Image Transfer Fluke Connect®/SmartView®
File Format is2
Display Size 3.5" (8.9 cm) diagonal
Click here for complete specifications on the Fluke 279FC/IFLEX

What's included with the Fluke 279FC/IFLEX

  • Multimeter
  • Current Probe
  • Test Leads
  • Hanging Strap
  • Carrying Case
  • Rechargeable Lithium Ion Battery and Charger
  • Three-Year Standard Warranty
This product features Fluke Connect Technology

See it. Save it. Share it. All the facts, right in the field.

Fluke engineers have delivered an innovative mobile platform and tool that helps solve everyday problems, allowing you to instantly document measurements, retrieve historical data, and share live measurements with your team. All handled by the Android™ or iOS smart phone you already carry.

Fluke Connect with ShareLive™ video call is the only wireless measurement system that lets you stay in contact with your entire team without leaving the field. The Fluke Connect mobile app is works with over 20 different Fluke products - the largest suite of connected test tools in the world.

Make the best decisions faster than ever before by viewing temperature, mechanical, electrical and vibration measurements for each equipment asset in one place. Get started saving time and increasing your productivity.


Fluke Connect Features:

  • TrendIt™ Graphs: Use graphing to show changes in measurements, allowing you to graph and show problems instantly.
  • EquipmentLog™ History: Access equipment history building a database of equipment health and baselines with cloud backup.
  • ShareLive™ Video Calls: Save, collaborate and share measurements instantly with your team anytime, from anywhere.
  • AutoRecord™ Measurements: Instantly save measurements to your phone with Cloud backup.
  • Fluke Cloud™ Storage: Securely access equipment records anywhere, anytime.

Fluke Connect Benefits:

  • Maximize uptime
  • Minimize maintenance costs
  • Better assessments with accurate records
  • Higher efficiency with less walking around; no notebook and excel needed
  • Share troubleshooting knowledge live
  • Create and share helpful content in the field
  • Access to Fluke digital product manuals means no need to carry manuals in the field
  • Keep organized manually entered measurements

The Fluke 279 FC True-RMS Thermal Multimeter Overview


In this introductory video, the viewer will receive an overview of the main features of this True RMS thermal multimeter. Additionally, this instrument is Fluke Connect compatible.

Introducing the Fluke 279 FC True RMS Thermal Multimeter


This introductory video will go over the main features of this True RMS thermal multimeter. Easily detect a heat map with this unit. Additionally, it comes equipped if a flexible probe which allows you to take measurements in tight and awkward areas of up to 2500 amps.

How To Set Up the Fluke iFlex Flexible Current Probe


This video is designed to demonstrate how to set up and use your Fluke iFlex flexible current probe. It provides users to capability to take measurements in tight areas. Additionally, it is compatible with a variety of Fluke products.

Using the Fluke iFlex Flexible Current Probe in Tight Areas


This video demonstrates how this flexible current probe is used for awkward and tight spaces. For this specific scenario, it is paired with the Fluke 381. Additionally, it is also compatible with a variety of Fluke products.

Getting to know the Fluke 279FC/iFlex True-rms Thermal Multimeter with iFlex


This video will serve as an overview of the Fluke 279FC/iFlex True-rms Thermal Multimeter.

Using the Fluke iFlex Flexible Current probe with the Fluke 376 FC True RMS Clamp Meter


This video demonstrates the versatility of the Fluke iFlex flexible current probe. Additionally, it is compatible with a variety of Fluke meters.

Multimeter measurements on adjustable speed drives

In the past, motor repair meant dealing with traditional three-phase motor failures that were largely the result of water, dust, grease, failed bearings, misaligned motor shafts, or just plain old age. But motor repair has changed in a big way with the introduction of electronically controlled motors, more commonly referred to as adjustable speed drives (ASDs). These drives present a unique set of measurement problems that can vex the most seasoned pro. Thanks to new technology, now for the first time you can take accurate electrical measurements with a DMM during the installation and maintenance of a drive and diagnose bad components and other conditions that may lead to premature failure.

Troubleshooting philosophy

Technicians use many different methods to troubleshoot an electrical circuit, and a good troubleshooter will always find the problem - eventually. The trick is tracking it down quickly and keeping downtime to a minimum. The most efficient troubleshooting procedure begins at the motor and then works systematically back to the electrical source, looking for the most obvious problems first. A lot of time and money can be wasted replacing perfectly good parts when the problem is simply a loose connection. As you go, take care to take accurate measurements. Nobody takes inaccurate measurements on purpose, but it's easy to do, especially when working in a high energy, noisy environment like an ASD. Likewise, choosing the right test tools for troubleshooting the drive, the motor, and the connections is of utmost importance. This is especially true when taking voltage, frequency and current measurements on the output side of the motor drive. But until now, there hasn't been a digital multimeter on the market able to accurately measure ASDs. Incorporates a selectable low pass filter* that allows for accurate drive output measurements that agree with the motor drive controller display indicator. Now, technicians won't have to guess whether the drive is operating correctly and delivering the correct voltage, current or frequency for a given control setting.

Drive measurements

Input side measurements

Any good quality True RMS multimeter can verify proper input power to an ASD. The input voltage readings should be within 1% of one another when measured phase to phase with no load. A significant unbalance may lead to erratic drive operation and should be corrected when discovered.

Output side measurements

On the flip side, a regular True RMS multimeter can't reliably read the output side of a pulse width modulated (pwm) motor drive, because the ASD applies pulse width modulated nonsinusoidal voltage to the motor terminals. A True RMS DMM reads the heating effect of the non-sinusoidal voltage applied to the motor, while the motor controller's output voltage reading only displays the rms value of the fundamental component (typically from 30 Hz to 60 Hz). The causes of this discrepancy are bandwidth and shielding. Many of today's True RMS digital multimeters have bandwidths out to 20 kHz or more, causing them to respond not only to the fundamental component, which is what the motor really responds to, but to all of the high frequency components generated by the pwm drive. And if the DMM isn't shielded for high frequency noise, the drive controller's high noise levels make the measurement discrepancies even more extreme. With the bandwidth and shielding issues combined, many True RMS meters display readings as much as 20 to 30% higher than what the drive controller is indicating. With the incorporated selectable low pass filter, allows troubleshooters to take accurate voltage, current and frequency measurements on the output side of the drive at either the drive itself or the motor terminals. With the filter selected, the readings for both voltage and frequency (motor speed) should agree with the associated drive control display indications, if available. The low pass filter also allows for accurate current measurements when used with Hall-effect type clamps. All of these measurements are especially helpful when taking measurements at the motor location when the drive's displays are not in view.

Taking safe measurements

Before taking any electrical measurements, be sure you understand how to take them safely. No test instrument is completely safe if used improperly, and many test instruments are not appropriate for testing adjustable speed drives. Also make sure to use the appropriate personal protective equipment (PPE) for your specific working environment and measurements. If at all possible, never work alone.

Safety ratings for electrical test equipment

ANSI and the International Electrotechnical Commission (IEC) are the primary independent organizations that define safety standards for test equipment manufacturers. The IEC 61010 second edition standard for test equipment safety states two basic parameters: a voltage rating and a measurement category rating. The voltage rating is the maximum continuous working voltage the instrument is capable of measuring. The category ratings depict the measurement environment expected for a given category. Most three-phase ASD installations would be considered a CAT III measurement environment, with power supplied from either 480V or 600V distribution systems. When using a DMM for measurements on these high energy systems, make sure it's rated at a minimum for CAT III 600V and preferably for CAT IV 600V/CAT III 1000V. The category rating and voltage limit are typically found on the front panel, at the input terminals. Dual-rated CAT IV 600V and CAT III 1000V. Refer to the ABC's of DMM Safety* from Fluke for additional information on category ratings and taking safe measurements.

How to take measurements

Now let's put the multimeter to the test. The measurements in the following procedure are designed to be made on a 480 volt 3 phase drive control at the control panel terminal strips. These procedures would also be valid for lower voltage 3 phase drives powered by either single or 3 phase supply voltages. For these tests the motor is running at 50 Hz.

Input voltage

To measure the ac voltage supply to the input side of the drive at the drive:

  • Select the ac voltage function.
  • Connect the black probe to one of the three phase input terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase input terminals and record the reading.
  • Leaving the black probe on the reference phase now move the red probe to the third phase input and record this reading.
  • Make sure there's no more than a 1% difference between these two readings.

Input current

Measuring the input current generally requires a current clamp accessory. In most cases, either the input current exceeds the maximum current measurable by the current function, or it isn't practical to "break the circuit" to take an in-line series current measurement. Regardless of clamp type, insure that all readings are within 10% of each other for proper balance.

Transformer type clamp (i200, 80i-400, 80i-600A)

  • Connect the clamp to the common and 400 mA input jacks.
  • Select the mA/A AC function.
  • Place the clamp around each of the input supply phase cables in succession, recording each of the readings as they are taken. Since these clamps output one milliamp per amp, the milliamp readings shown on the display are the actual phase current readings in amps.

Hall Effect type (AC/DC) clamp (i410,i-1010)

  • Connect the clamp to the common and V/W input jacks.
  • Select the AC voltage function.
  • Press the yellow button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the drive controller. Once the low pass filter is enabled, the meter will be in the 600 mV manual range mode.
  • Place the clamp around each of the input supply phase cables in succession, recording each of the readings as they are taken. Since these clamps output one millivolt per amp, the millivolt readings shown on the display are the actual phase current readings in amps.

Figure 1. Output voltage reading without using the low pass filter.


Figure 2. Output voltage reading with low pass filter enabled.

Output voltage

To measure the AC output voltage at either the drive or the motor terminals:

  • Plug the black test lead into the common jack and the red test lead into the V/W jack.
  • Select the AC voltage function.
  • Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase output voltage or motor terminals.
  • Press the yellow button to enable the low pass filter. Now record the reading.
  • Leaving the black probe on the reference phase, now move the red probe to the third phase output voltage or motor terminal and record this reading.
  • Make sure that there's no more than a 1% difference between these two readings (see Figure 2). The readings should also agree with the controller display, panel if available.
  • If the low pass filter isn't enabled, the output voltage readings may be 10 to 30% higher, as on a regular DMM (see Figure 1).

Figure 3. Output frequency (motor speed) without the low pass filter.


Figure 4. Output frequency (motor speed) using the low pass filter.

Motor speed (Output frequency using voltage as a reference)

To determine motor speed, simply take a frequency measurement while using the low pass filter. The measurement can be made between any two of the phase voltage or motor terminals.

  • Plug the black test lead into the common jack and the red test lead into the V/W jack.
  • Select the ac voltage function.
  • Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase output voltage or motor terminals.
  • Press the yellow button to enable the low pass filter.
  • Press the Hz button. The displayed reading in hertz will be the motor speed (see Figure 3). This measurement couldn't be made successfully without the low pass filter (see Figure 4).

Output current

TAs with input current, measuring the output current generally requires a current clamp accessory. Once again, regardless of clamp type, insure that all readings are within 10% of each other for proper balance.

Transformer type clamp (i200, 80i-400, 80i-600A)

  • Connect the clamp to the common and 400 mA input jacks.
  • Select the mA/A ac function.
  • Place the clamp around each of the output phase cables in succession, recording each of the readings as they're taken. Since these clamps output 1 milliamp per amp, the milliamp readings shown on the display are the actual phase current readings in amps.

Figure 5. Output current reading without using the low pass filter.


Figure 6. Output current reading with low pass filter enabled.

Hall Effect type (AC/DC) clamp (i410,i-1010)

  • Connect the clamp to the common and V/W input jacks.
  • Select the ac voltage function.
  • Press the yellow button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the drive controller. Once the low pass filter is turned on, the meter will be in the 600 mV manual range mode.
  • Place the clamp around each of the output phase cables in succession, recording each of the readings as they are taken (see Figure 6). Since these clamps output 1 millivolt per amp, the millivolt readings shown on the 87-V display are the actual phase current readings in amps. This measurement would not be possible without the low pass filter (see Figure 5).

Motor speed (Output frequency using current as a reference)

For motors that pull at least 20 amps of running current, motor speed can be determined by taking a frequency measurement with current clamps. Until now, noise issues have prevented accurate readings using hall effect type clamps. Here's how the low pass filter makes it possible.

Motor speed using a Hall Effect type (AC/DC) clamp (i410,i-1010)

  • Connect the clamp to the common and V/W input jacks.
  • Select the ac voltage function.
  • Press the yellow button to enable the low pass filter. This allows the meter to reject all of the high frequency noise generated by the drive controller. Once the low pass filter has been turned on, the meter will be in the 600 mV manual range mode.
  • Place the clamp around one of the output phase cables. Verify that the multimeter is reading a current of at least 20 amps (20 mV in the display).
  • Press the Hz button. The readings now display the motor speed as a frequency measurement.

Motor speed using a transformer type clamp (i200, 80i-400, 80i-600A)

  • Connect the clamp to the common and 400 mA input jacks.
  • Select the mA/A AC function.
  • Place the clamp around one of the output phase cables. Verify that the multimeter is reading a current of at least 20 amps (20mA in the display).
  • Press the Hz button. The readings now display the motor speed as a frequency measurement.

DC Bus measurements

A healthy dc bus is a must for a properly operating motor drive. If the bus voltage is incorrect or unstable, the converter diodes or capacitors may be starting to fail. The DC bus voltage should be approximately 1.414 times the phase to phase input voltage. For a 480 volt input, the DC bus should be approximately 679 VDC. The DC bus is typically labeled as DC+, DC- or B+, Bon the drive terminal strip. To measure the DC bus voltage:

  • Select the dc voltage function.
  • Connect the black probe to either the DC- or B- terminal.
  • Connect the red probe to the DC+ or B+ terminal. The bus voltage should agree with the example mentioned above and be relatively stable. To check the amount of ac ripple on the bus, switch the 7V's function switch to the vac function. Some small drives don't allow external access to the DC bus measurement without disassembling the drive. If you can't access the DC bus, use the peak min max function on the multimeter to measure the dc bus voltage via the output voltage signal.
  • Plug the black test lead into the common jack and the red test lead into the V/½ jack.
  • Select the AC voltage function.
  • Connect the black probe to one of the three phase output voltage or motor terminals. This will be the reference phase.
  • Connect the red probe to one of the other two phase output voltage or motor terminals.
  • Press the MIN MAX button.
  • Press the (Peak min max) button.
  • The displayed reading in Peak min max will be the DC bus voltage.

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