The Fluke Calibration 772 is a professional milliamp process clamp meter designed for measuring, sourcing and simulating 4–20 mA signals in industrial process control systems.
Its most important advantage is the ability to measure current signals without interrupting the current loop. This allows maintenance technicians and calibration specialists to check process signals while the system remains in operation.
The Fluke Calibration 772 combines a highly sensitive milliamp clamp with integrated current measurement, current sourcing and transmitter simulation functions.
With an accuracy of 0.2% + 5 counts for clamp measurements up to 20.99 mA and a resolution of 0.01 mA, the instrument is particularly suitable for troubleshooting industrial instrumentation.
The integrated current source provides signals from 0 to 24 mA, allowing technicians to test controllers, analog inputs, positioners and other process control equipment.
A detachable measurement clamp, illuminated display and compact construction make the instrument especially convenient for field applications.
The Fluke Calibration 772 is suitable for maintenance departments, industrial production facilities, process instrumentation specialists and calibration laboratories.
europascal supports customers with professional electrical calibration equipment, technical advice and calibration services.
For information about traceable electrical calibration, visit the europascal Calibration Service.
Your Benefits at a Glance
- Measurement of 4–20 mA signals without interrupting the current loop
- Clamp measurement range up to 100 mA
- Resolution of 0.01 mA in the lower clamp measurement range
- Clamp measurement accuracy of 0.2% + 5 counts up to 20.99 mA
- Direct current measurement from 0 to 24 mA
- Integrated current source from 0 to 24 mA
- Simulation of 4–20 mA transmitter signals
- Integrated 24 V loop power supply
- Automatic current ramp function
- Automatic 25% current steps
- Detachable measurement clamp
- Measurement Spotlight for poorly illuminated locations
- Dual backlit display
- Simultaneous indication of current and percentage of 4–20 mA span
- Hold function for capturing measurement values
- Suitable for testing PLC analog inputs
- Suitable for troubleshooting industrial transmitters
- Compact design weighing approximately 410 g
- Battery operation using four AA batteries
- Professional calibration support from europascal
Ideal for Industrial Process Calibration
The Fluke Calibration 772 is designed for applications involving industrial current loops.
In industrial automation, analog signals are frequently transmitted using a standardized current range of:
4–20 mA
This signal represents a defined measurement range.
For example, a pressure transmitter with a measuring range from 0 to 10 bar may generate the following signals:
| Pressure | Output Current |
|---|---|
| 0 bar | 4 mA |
| 2.5 bar | 8 mA |
| 5 bar | 12 mA |
| 7.5 bar | 16 mA |
| 10 bar | 20 mA |
The Fluke Calibration 772 allows technicians to measure these signals directly.
The instrument can also generate corresponding current values to test the connected control system.
This makes it particularly useful for commissioning, troubleshooting and preventive maintenance.
Measure Current Without Interrupting the Loop
One of the most important features of the Fluke Calibration 772 is its ability to measure milliamp signals using a current clamp.
Conventional current measurement requires the electrical circuit to be opened and the measuring instrument connected in series.
This can interrupt the process signal and potentially affect the operation of connected equipment.
The Fluke Calibration 772 avoids this problem.
The measurement clamp is positioned around a single conductor carrying the current signal.
The instrument measures the current without requiring an electrical connection to the circuit.
This provides several advantages:
- No interruption of the current loop
- Reduced risk of wiring errors
- Faster troubleshooting
- Reduced process downtime
- Convenient measurement in control cabinets
- Improved efficiency during maintenance
The conductor must be positioned correctly inside the clamp.
The maximum conductor diameter is 4.5 mm.
Clamp Measurement Range up to 100 mA
The Fluke Calibration 772 provides two clamp measurement ranges.
| Measurement Range | Accuracy |
|---|---|
| 0 to 20.99 mA | ±(0.2% of reading + 5 counts) |
| 21.0 to 100.0 mA | ±(1% of reading + 5 counts) |
The lower measurement range provides a resolution of 0.01 mA.
The higher range is particularly useful for checking current signals in older industrial control systems.
The measurement range up to 100 mA extends the instrument’s usefulness beyond conventional 4–20 mA applications.
Direct Current Measurement
In addition to non-contact clamp measurements, the Fluke Calibration 772 can measure current directly using its electrical test terminals.
The direct measurement range is:
0 to 24.00 mA
The specified accuracy is:
±(0.2% of reading + 2 counts)
The resolution is:
0.01 mA
Direct measurement requires the instrument to be connected in series with the current loop.
This function is useful when a conventional electrical current measurement is required.
It also allows technicians to compare direct current measurements with clamp measurements.
Integrated Current Source
The Fluke Calibration 772 includes an integrated current source.
The output range is:
0 to 24.00 mA
The specified accuracy is:
±(0.2% of output + 2 counts)
The instrument can deliver up to 24 mA into a load of 1000 Ω.
This function allows technicians to generate defined current signals for testing industrial equipment.
Typical applications include:
- PLC analog input testing
- Process controller testing
- Current input verification
- Indicator calibration
- Recorder testing
- I/P converter testing
- Positioner testing
The current source can be adjusted manually or operated using automatic output functions.
Simulation of 4–20 mA Signals
The Fluke Calibration 772 can simulate a current transmitter.
The simulation range is:
0 to 24.00 mA
The specified accuracy is:
±(0.2% of output + 2 counts)
In simulation mode, the instrument controls the current supplied by an external loop power source.
This allows technicians to replace the transmitter signal temporarily with a defined test signal.
For example, a technician can simulate 4 mA, 12 mA and 20 mA to verify the response of a connected controller.
This is particularly useful during commissioning and troubleshooting.
The maximum permitted external voltage for current simulation is 50 V DC.
Integrated 24 V Loop Power Supply
The Fluke Calibration 772 provides a 24 V loop power function.
This allows compatible two-wire transmitters to be supplied during testing.
The function is useful when an external loop power supply is unavailable.
It simplifies field measurements and helps reduce the amount of additional equipment required.
The transmitter and measuring instrument must be connected according to the manufacturer’s operating instructions.
Automatic Current Stepping
The Fluke Calibration 772 supports automatic current stepping.
The output can be changed in increments corresponding to 25% of the standard 4–20 mA span.
Typical output values are:
| Percentage | Current |
|---|---|
| 0% | 4 mA |
| 25% | 8 mA |
| 50% | 12 mA |
| 75% | 16 mA |
| 100% | 20 mA |
This function is particularly useful when testing analog input channels.
Instead of manually adjusting the current output, technicians can quickly select standardized test points.
Automatic stepping helps improve efficiency and repeatability during routine testing.
Automatic Current Ramp Function
The Fluke Calibration 772 also provides an automatic current ramp function.
The instrument can continuously change the output current over a defined range.
This is useful for observing the response of connected process equipment.
Typical applications include testing analog indicators, control valves and process controllers.
The ramp function helps identify irregularities in the response of the connected device.
It can also be used during functional testing and commissioning.
Detachable Measurement Clamp
The Fluke Calibration 772 features a detachable current clamp.
The clamp can be separated from the main instrument and used with its extension cable.
This allows measurements in locations where access is restricted.
Typical applications include:
- Industrial control cabinets
- Densely populated terminal blocks
- Process instrumentation panels
- Electrical distribution enclosures
- Machinery control systems
The detachable clamp improves flexibility and allows technicians to position the measuring element more conveniently.
Illuminated Display and Measurement Spotlight
The Fluke Calibration 772 includes a backlit display.
The instrument can display the measured current and the corresponding percentage of the 4–20 mA span.
This makes it easier to interpret current signals during maintenance.
The integrated Measurement Spotlight illuminates the measurement area.
This is particularly useful in poorly illuminated control cabinets.
The instrument also provides a Hold function for retaining displayed measurement values.
Calibration of Process Control Systems
The Fluke Calibration 772 is particularly suitable for testing process control systems.
Industrial control systems rely on accurate analog signals to monitor and control production processes.
The instrument can be used to verify the current signals transmitted between sensors, transmitters, controllers and actuators.
Typical applications include:
- PLC analog input verification
- Distributed control system testing
- Process transmitter troubleshooting
- Current loop verification
- Control valve testing
- Process indicator calibration
The combination of current measurement, sourcing and simulation functions allows technicians to perform several testing tasks using one instrument.
Calibration of Pressure Transmitters
Pressure transmitters frequently use 4–20 mA signals.
The Fluke Calibration 772 can measure the transmitter output without interrupting the current loop.
This allows technicians to verify the electrical output while the transmitter remains connected to the control system.
For a complete pressure transmitter calibration, an appropriate pressure reference and pressure source are also required.
The Fluke Calibration 772 measures the electrical signal but does not generate or measure pressure.
Calibration of Temperature Transmitters
Temperature transmitters convert RTD or thermocouple signals into standardized current outputs.
The Fluke Calibration 772 can be used to measure or simulate the corresponding current signals.
For complete temperature transmitter calibration, a suitable temperature source or electrical sensor simulator is additionally required.
The instrument is therefore a useful component of a temperature transmitter calibration setup.
Technical Highlights
| Specification | Fluke Calibration 772 |
|---|---|
| Manufacturer | Fluke Calibration |
| Model | 772 |
| Product type | Milliamp Process Clamp Meter |
| Clamp measurement range 1 | 0 to 20.99 mA |
| Clamp accuracy range 1 | ±(0.2% + 5 counts) |
| Clamp measurement range 2 | 21.0 to 100.0 mA |
| Clamp accuracy range 2 | ±(1% + 5 counts) |
| Clamp resolution | 0.01 mA / 0.1 mA |
| Direct current measurement | 0 to 24.00 mA |
| Direct measurement accuracy | ±(0.2% + 2 counts) |
| Current source | 0 to 24.00 mA |
| Current source accuracy | ±(0.2% + 2 counts) |
| Current simulation | 0 to 24.00 mA |
| Current simulation accuracy | ±(0.2% + 2 counts) |
| Maximum source load | 1000 Ω at 24 mA |
| Maximum simulation voltage | 50 V DC |
| Loop power | 24 V |
| Automatic stepping | 25% increments |
| Automatic ramp | Yes |
| Detachable clamp | Yes |
| Maximum conductor diameter | 4.5 mm |
| Display | Dual backlit display |
| Measurement Spotlight | Yes |
| Hold function | Yes |
| Operating temperature | −10 °C to +50 °C |
| Storage temperature | −25 °C to +60 °C |
| Protection rating | IP40 |
| Power supply | Four AA batteries |
| Battery life | Approx. 12 hours at 12 mA output into 500 Ω |
| Dimensions | Approx. 44 × 70 × 246 mm |
| Weight | Approx. 410 g |
| Warranty | 3 years on electronics |
Fluke Calibration 771, 772 and 773 Comparison
The Fluke Calibration 772 belongs to a family of professional milliamp process clamp meters.
The models differ in their measurement and output capabilities.
| Function | Fluke 771 | Fluke 772 | Fluke 773 |
|---|---|---|---|
| Clamp measurement | Yes | Yes | Yes |
| Direct mA measurement | No | Yes | Yes |
| mA source | No | Yes | Yes |
| mA simulation | No | Yes | Yes |
| 24 V loop power | No | Yes | Yes |
| DC voltage measurement | No | No | Yes |
| DC voltage source | No | No | Yes |
| Scaled mA output | No | No | Yes |
The Fluke Calibration 771 is designed primarily for non-contact current measurement.
The Fluke Calibration 772 adds current sourcing, current simulation and direct current measurement.
The Fluke Calibration 773 provides additional voltage measurement and voltage output functions.
For technicians working primarily with 4–20 mA process signals, the Fluke Calibration 772 provides an excellent combination of functionality and portability.
Calibration Service by europascal
Regular calibration is essential for maintaining reliable and traceable electrical measurements.
europascal provides professional calibration services for electrical measuring instruments and process calibration equipment.
When calibrating a milliamp process clamp meter, several measurement characteristics must be considered.
These include:
- Clamp current measurement accuracy
- Direct current measurement accuracy
- Current source accuracy
- Current simulation accuracy
- Measurement resolution
- Measurement repeatability
- Environmental influences
For demanding applications, measurement uncertainty should be evaluated according to the relevant calibration procedure.
Professional calibration helps ensure that process instrumentation measurements remain reliable and traceable.
For more information, visit the europascal Calibration Service.
Why Choose the Fluke Calibration 772?
The Fluke Calibration 772 combines non-contact milliamp measurement with integrated process calibration functions.
Its ability to measure 4–20 mA signals without interrupting the current loop helps reduce process downtime.
The detachable measurement clamp provides convenient access to conductors in crowded control cabinets.
Integrated current sourcing and simulation functions allow technicians to test industrial controllers and transmitters.
Automatic current stepping and ramp functions simplify routine testing.
The illuminated display and Measurement Spotlight improve usability in industrial environments.
With a weight of approximately 410 g, the instrument is convenient for mobile maintenance and field service applications.
For process instrumentation technicians, maintenance engineers and calibration specialists, the Fluke Calibration 772 provides a versatile solution for industrial current loop testing.
europascal supports customers with professional electrical calibration equipment, technical advice and calibration services.
Typical Applications for the Fluke Calibration 772
Typical applications include:
- 4–20 mA loop measurement
- Process current measurement
- PLC analog input testing
- Current loop troubleshooting
- Pressure transmitter testing
- Temperature transmitter testing
- Process controller verification
- Current signal simulation
- Current source testing
- Industrial instrumentation maintenance
- Control valve testing
- I/P converter testing
- Process indicator verification
- Preventive maintenance
- Commissioning
- Calibration laboratories
- Industrial quality assurance
- Process automation
The combination of non-contact current measurement, integrated current sourcing, transmitter simulation and portable construction makes the Fluke Calibration 772 a professional solution for industrial process calibration applications.
Find more Fluke Calibration products here.
Manufacturer information for the Fluke Calibration 772 can be found on the official Fluke Calibration website.
