User Manual

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.