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How to measure resistance of a Compressor


Issue:
This article explains how Measure Compressor Resistance for Testing

Product line:
AFX, PA4000, ACPSC2000, ACPSC3500,  Network Air FM, ACRP1XX, ACRD5XX, ACRD1XX, ACRD2XX, ACSC1XX, ACPDX21-86, TDAV, TUAV, TDVT, TUVTl

Environment:
All AC Units with compressorsl

Cause:
How to measure for bad compressorl

Resolution:
Resistance tests should only be performed on de-energized circuits. Check the fuse before testing. Connecting to an energized circuit while the test is active will blow the fuse.

To measure resistance:

1.Insert test probes in the ? and COM input terminals.

2. Turn the rotary switch to the O position

3. Short the ends of the probes together, press the blue button and wait until dashes appear on the display. The Tester measures the probe resistance, stores the reading in memory, and subtracts it from readings.The probe resistance reading is saved even when the Tester is turned off. If the probe resistance is >2, the resistance will not be saved.

4. Connect the probes to the circuit to be measured. The Tester automatically detects if the circuit is energized.• The primary display shows ---- until you press the T button and a valid resistance reading is obtained. • The high voltage symbol (Y) along with a primary display of >2 V warns if voltage greater than 2 V ac or dc is present. In this condition, the test is inhibited. Disconnect the Tester and remove power before proceeding.• If the Tester chirps when you press the T button, the test is inhibited because voltage is present at the probes.

5. Push and hold the T button to start the test. The  icon appears on the lower portion of the display until you release the T button. The resistance reading appears on the primary display until a new test is started or a different function or range is selected. When resistance is higher than the maximum display range, the Tester displays the > symbol and the maximum resistance for the range.


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