Fluke 772 Milliamp Process Clamp Loop Meter

The Fluke 772 combines a milliamp process clamp meter with loop calibration functions, allowing technicians to measure, source and simulate 4–20 mA process signals without the need to disconnect the loop for clamp measurements. It is designed for process technicians and engineers working with transmitters, PLC/DCS analog I/O and industrial control systems.

Measure 4–20 mA Without Breaking the Loop

One of the main advantages of the Fluke 772 is its ability to measure current directly with the clamp. This allows technicians to troubleshoot a live process loop without opening the circuit or powering down the connected device.

The clamp measurement range covers 0 to 20.99 mA, with a specified accuracy of 0.2% + 5 counts in the primary range. The instrument provides 0.01 mA resolution, making small changes in process signals easier to identify.

Source and Simulate 4–20 mA Signals

Unlike a basic clamp meter, the Fluke 772 can also source and simulate 4–20 mA signals.

This makes it possible to test control-system inputs, I/P devices and other current-loop equipment by generating known mA values rather than relying only on measurements from the existing loop.

The source and simulate functions cover 0 to 24.00 mA, with 0.2% + 2 counts accuracy.

Integrated 24 V Loop Power

The Fluke 772 includes 24 V loop power for powering and testing compatible transmitters while measuring their current output.

This allows a single instrument to perform several common field tasks without requiring a separate loop power supply.

The combination of clamp measurement, loop measurement and loop power makes the 772 particularly useful for commissioning and troubleshooting process transmitters.

Detachable Clamp for Difficult Locations

The detachable clamp can be connected through an extension cable, allowing technicians to position the measuring jaw in tight or difficult-to-access locations.

This is useful when process instruments are installed inside crowded control cabinets, junction boxes or other areas where a conventional meter is difficult to position.

The maximum measurable conductor diameter is 4.5 mm.

Fast Troubleshooting of Live Process Loops

Because clamp measurement does not require the loop to be opened, technicians can investigate changing process signals while the system remains operational.

The Fluke 772 also provides:

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  Hold function for capturing changing measurements
  
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  Linear ramp output
  
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  25% step output
  
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  Automatic output changes for remote testing
  
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  Dual backlit display
  
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  Simultaneous mA value and percentage of the 4–20 mA span
  
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  Measurement spotlight for poorly illuminated wiring
  
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  Auto-off and backlight timeout functions
  

Extended Measurement Range

In addition to standard 4–20 mA applications, the Fluke 772 can measure signals up to 99.9 mA using its extended range.

This is useful when working with older control systems or applications where current signals exceed the conventional 4–20 mA process range.

Key Technical Parameters

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  Clamp current measurement: 0–20.99 mA
  
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  Extended current range: up to 99.9 mA
  
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  Clamp measurement accuracy: 0.2% + 5 counts
  
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  In-series mA measurement: 0–24.00 mA
  
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  mA source: 0–24.00 mA
  
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  mA simulation: 0–24.00 mA
  
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  Source/simulate accuracy: 0.2% + 2 counts
  
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  Resolution: 0.01 mA
  
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  Loop power: 24 V
  
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  Maximum conductor diameter: 4.5 mm
  
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  Operating temperature: -10 to +50 °C
  
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  Protection rating: IP40
  
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  Dimensions: 44 × 70 × 246 mm
  
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  Weight: approximately 410 g
  
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  Power: 4 × AA alkaline batteries
  

Typical Applications

The Fluke 772 is suitable for:

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  4–20 mA loop troubleshooting
  
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  Pressure transmitter testing
  
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  Temperature transmitter testing
  
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  Flow transmitter testing
  
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  Level transmitter testing
  
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  PLC/DCS analog I/O verification
  
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  Process transmitter commissioning
  
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  Control system troubleshooting
  
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  I/P device testing
  
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  Live process loop measurement
  
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  Industrial instrumentation maintenance
  

Fluke 772 vs. Fluke 771

The Fluke 771 focuses primarily on measuring 4–20 mA signals without breaking the loop, while the Fluke 772 adds 4–20 mA sourcing, simulation and 24 V loop power. This makes the 772 better suited to technicians who need both troubleshooting and active loop testing from one instrument.

Compared with the Fluke 773, the 772 does not provide the 773's DC voltage source/measurement functions. The 773 is therefore better suited when both mA loop work and DC voltage testing are required.

FAQ

What is the Fluke 772 used for?

The Fluke 772 is used to measure, source and simulate 4–20 mA process signals, as well as power and test compatible transmitters and control-system loops.

Can the Fluke 772 measure 4–20 mA without breaking the loop?

Yes. Its detachable clamp allows technicians to measure 4–20 mA signals without opening or disconnecting the loop.

Can the Fluke 772 source 4–20 mA?

Yes. The Fluke 772 can source 0–24 mA for testing control-system I/O and I/P devices.

Can the Fluke 772 simulate a 4–20 mA transmitter?

Yes. The 772 provides a 0–24 mA simulation function for testing current-loop inputs and related process equipment.

Does the Fluke 772 provide loop power?

Yes. It provides 24 V loop power for powering and testing compatible transmitters.

What is the accuracy of the Fluke 772?

For clamp measurement in the primary 0–20.99 mA range, the specified accuracy is 0.2% + 5 counts. In-series mA measurement and source/simulate functions are specified at 0.2% + 2 counts.