10
Current Measurement
Do not attempt to measure more than 20 amps.
Failure to observe this warning may result in serious injury or death.
Contact with live circuits will result in severe
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
20 A input terminal.
4. Set range selector to the appropriate DCA range.
Note: When measuring an unknown current, start at the 20 A range.
5. Connect the test leads to the circuit.
6. Apply power to the circuit under test and read the display.
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 20 A 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.
