Current Measurement - Greenlee 93-604 Instruction Manual

Current Measurement

Do not measure current in circuits with more than 250 VAC/VDC or in
circuits which have a maximum load exceeding 4000 VA and fuse
protection greater than 16 amps. Electric shock can result.
Failure to observe this warning can result in serious injury or death.
1. Shut off and disconnect power to the circuit to be tested.
2. Open the branch of the circuit where the current is to be measured.
3. Plug the black test lead into the COM input terminal, and plug the red test lead into the
appropriate current input terminal.
Note: When measuring an unknown current, start with the red test lead plugged into the
20A input terminal.
4. Set selector switch to the appropriate ACA or DCA range.
Note: When measuring an unknown current, start at the 20A range.
5. Connect the test leads to the circuit.
6. Apply power to the circuit under test and read the display.
Note: A current measurement of 20 amps must not exceed 30 seconds and may not be
repeated more frequently than 15-minute intervals.
Note: If the resolution of the reading is not satisfactory, shut off power to the circuit and
switch to the next lower range. Turn on the power to the circuit and read the display.
Repeat this procedure until the resolution is satisfactory.
Note: If the range selector must be changed from 20A range to the 200 mA range to obtain
finer resolution, you must also unplug the red test lead from the 20A input terminal and
plug it into the mA input terminal.
7. Shut power off and disconnect the meter from the circuit.
8. Reconnect the circuit.
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Electric shock hazard:
Contact with live circuits can result in severe
injury or death.