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OM-2065 / Operation and Maintenance Manual
90SB51 / Spec. 7015-3 / Frequency Converter
Section 5. Capacitor Test Procedure
1. Taking Resistance Measurements on Capacitors
a. Before taking resistance measurements, make certain that the capacitor being checked is discharged
(check with voltmeter) and removed (disconnected) from all other circuitry.
b. To take resistance measurements on the capacitor, use an ANALOG ohmmeter (NOT a
digital ohmmeter).
c. Set the ohmmeter to X100 or higher on ohms.
d. For taking these measurements, place one ohmmeter lead on each capacitor terminal.
For DC capacitors, such as C7 - C16, connect the meter "+" to capacitor terminal "+" and the meter
"-" to capacitor terminal "-".
For AC capacitors, such as C17 - C34, polarity of meter connections is not important.
e. Good capactiors will show some resistance followed by decay . . . falling to or near infinity as the
capacitor takes a charge.
f. Bad capacitors will show low to no resistance (short circuit) or infinite resistance (open circuit).
No charging of the capacitor will be noted.
NOTE: A DIGITAL ohmmeter may be used to check capacitors by using the X1 scale or DIODE CHECK
scale (if so equipped). Changes in resistance and trends will be more difficult to detect.
Defective capacitors can be identified by comparing them with a known good capacitor.
Nov 01/90
Chapter 3-5
Page 1
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