11
W
Caution
During current measurement keep the jaws away from other current-
carrying devices such as transformers, motors or energized wires, as they
may negatively influence accuracy of the measurement.
Microamps μA Measurement
The μA DC ( ) function on the Meter is primarily for HVAC flame sensor
testing. To test a heating system flame sensor:
1. Turn the heating unit off and locate the wire
between the gas-burner controller and the flame
sensor.
2. Disconnect one of the flame sensor wires.
3. Turn the rotary switch on the Meter to
.
4. Connect the black test lead to the COM terminal and
the red test lead to the μA terminal.
5. Using alligator clips, connect a meter in series by
attaching one alligator clip to the disconnected flame
sensor probe and the second one to the disconnected
control-module terminal.
6. Turn heating unit on and check the reading on the
Meter.
7. Refer to the heating unit documentation for what
the correct reading should be.
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