Don’t break the loop on 4-20 mA signal measurements and save time.

Are you spending time?

Taking mA measurements by removing a wire and breaking the loop Calling the control room to isolate a loop Testing analog input/output on a console Troubleshooting devices with mA inputs and outputs Repairing intermittent or erratic 4-20 mA loops Going back to the shop to get extra tools

If you need more time in your busy day check out the Fluke 77X mA Clamp Meters. They are designed to save you time, and money, by eliminating time wasting activities. Now you can troubleshoot and repair 4-20 mA loops without breaking the loop or bringing down the system.

Here are some specific ways the 77X Clamp Meters will help you:

Milliamp Clamp Features	Application	How it saves time and money
Measure mA signals for PLC and control system analog I/O without breaking the loop. (771, 772 and 773)	Measures low level dc current	Correlate process indication with real physical value
Measure output signals from transmitters without breaking the loop (771, 772 and 773)	Maintain and troubleshoot process and automation equipment without breaking the loop	No disruption to the process
Detachable clamp with extension cable (771, 772 and 773)	Measurements in tight locations	Enables measurements in difficult situations
Source, simulate and measure mA signals in circuit (break the loop) (772 and 773)	Confirm non-contact measurement. Have the next tool in hand for troubleshooting (source simulate)	Eliminates the need to return to the shop to get a loop calibrator for troubleshooting after finding a bad signal with non-contact measurement
Source and measure VDC (773 only)	Troubleshoot voltage input and output devices.	Measure presence of 24V loop power. Measure 1 to 5 or 0 to 10V process signals. Test chart recorders
4 to 20 mA In/out (773 only)	Dual channel mA source and measurement for troubleshooting	Source 4 to 20 mA signals into valves and mA signal conditioners and simultaneously measure 4 to 20 mA positioning output signals.
4 to 20 mA scaled output (773 only)	Scaled mA output provides a mA signal output representative of the measured mA value	Connect a logging DMM and log the mA signal without breaking the loop
Loop power supply (772 and 773)	Power a transmitter	Substitute testing of the installed 24V loop power supply. Power a transmitter and measure its mA output signal for troubleshooting.
Dual backlit display with both mA measurement and percent of 4 to 20 mA span (771, 772 and 773)	Clear measurement presentation	Allows quick measurement evaluation
Measurement Spotlight (771, 772 and 773)	Illuminates hard to see wires in dark enclosures	Measurement process is easier and quicker
Measure up to 99.9 mA range non-contact (771, 772 and 773)	Wide range of measurements	Measures 10 to 50 mA signals in older control systems
Automatic power off (771, 772 and 773)	After 15 minutes and 2 minute automatic off for backlight and spotlight	Saves battery life

Best in class 0.2 % accuracy 0.01 mA resolution and sensitivity Measure 4 to 20 mA signals without ”breaking the loop” Measure mA signals for PLC and control system analog I/O Dual backlit display with both mA measurement and percent of 4 to 20 mA span Measurement Spotlight illuminates hard to see wires in dark enclosures Detachable clamp with extension cable for measurements in tight locations Measure 10 to 50 mA signals in older control systems using the 99.9 mA range Automatically change the 4 to 20 mA output for remote testing Power saving features, auto-off, backlight timeout extend battery life Hold function captures and displays changing measurements

772 and 773 add:

Measure 4 to 20 mA signals with in-circuit measurement Simultaneous mA in-circuit measurement with 24V loop power for powering and testing transmitters Source 4 to 20 mA signals for testing control system I/O or I/Ps mA output linear ramp or 25% step output Automatically change the 4 to 20 mA output for remote testing

773 Only Features:

DC voltage measurement to verify 24V power supplies or voltage I/O signals Source DC voltage to test input devices that accept a 1-5V or 0 to 10V signals Scaled mA output provides a continuous mA signal that corresponds to the 4 to 20 mA signal measured by the mA clamp Enables milliamp signal logging to a separate logging device without breaking the loop Output mA signal enables a logging DMM or other device to record the 4- to 20 mA signal without breaking the loop mA in/out: simultaneously measure the mA signal with the clamp and source a mA signal Apply a mA input signal to a device and measure its’ 4-20 mA output on devices such as valves or mA isolators Voltage output linear ramp or 25% step output Automatically change the voltage output for remote testing

Here is an overview of the different models and their features:

What’s the difference between the 77X models?

	Fluke-771	Fluke-772	Fluke-773
	Non-contact mA loop measurement	Integrated mA loop troubleshooting	Advanced process troubleshooting
mA measure, jaw	X	X	X
mA measure, in circuit		X	X
Loop power		X	X
mA source		X	X
DCV measure			X
DCV source			X
mA scaled output			X
mA in / out			X

Functional Specifications
mA measurement (Measured by clamp) 771 /772 / 773	Resolution and Range:  0 to 20.99 mA Accuracy:  0.2% +2 counts Resolution and Range:  21.0 mA to 100.0 mA Accuracy:  1% + 5 counts
mA measurement (Measured in series with test jacks) 772/773	Resolution and Range:  0 to 24.00 mA Accuracy:  0.2% +2 counts
mA source (Maximum mA Drive: 24 mA into 1,000 ohms) 772/773	Resolution and Range:  0 to 24.00 mA Accuracy:  0.2% +2 counts
mA simulate (Maximum voltage 50 V dc) 772/773	Resolution and Range:  0 to 24.00 mA Accuracy:  0.2% +2 counts
Voltage source (2 mA maximum drive current)) 773 only	Resolution and Range:  0 to 10.00 V dc Accuracy:  0.2% +2 counts
Voltage measure 773 only	Resolution and Range:  0 to 30.00 V dc Accuracy:  0.2% +2 counts