Vanguard WRM-40 - Manual (Page 61)

REV 3 WRM-10P AND WRM-40 USER’S MANUAL
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5.0 Troubleshooting Guide
PROBLEM DESCRIPTION Probable Cause Suggested Solution
No current displayed on
the LCD screen when
performing a test. • Opened current cable connection.
• Opened transformer windings.
• Check current cable connection.
• Perform a quick test using a shunt
or a piece of aluminum bar.
Resistance reading is zero
or invalid while current
value is displayed on the
LCD screen. • Opened sense leads connection.
• Sense leads problem. • Check sense leads connection to
D.U.T.
• Check sense leads using an
ohmmeter.
• Perform a diagnostic test. See
section 3.8.