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MicroAmps DC (µADC)
Test flame rectifier diodes on a heater control. Connect leads between
flame sensor probe and control module. Turn heating unit on. When the
flame is on, there should be a measurable µADC signal, typically under
10µADC. Compare measurement to manufacturer’s specification to
determine if replacement is necessary.
Ranges:
1000µA
Resolution:
0.1µA
Accuracy:
±(1.0% + 5)
Volts burden:
5V
Overload Protection:
600VDC or 600VAC rms
Capacitance (MFD)
Test motor start and run capacitors. Capacitors are one of the most
failure prone components in a HVACR system. Disconnect from power and
any resistors found between terminals. Discharge capacitor before testing.
If dIS.C is displayed, the capacitor needs to be fully discharged to test.
Press SELECT three times to enter Capacitance mode.
Ranges:
10nF, 100nF, 1000nF, 10µF, 100µF, 1000µF, 10mF
Accuracy:
±(3% + 15) 10nF, ±(3% + 5) 100nF to 1000µF, ±(5% + 5) 10mF
Resolution:
0.01nF
Overload Protection:
600VDC or 600VAC rms
Discharge Cap First!
