Fault Indicator Leds; X-Z Fault; X-Y High Resistance; Xv-Y High Resistance (4610) - AEMC 3640 User Manual

2.3

Fault Indicator LEDs

The three indicators described below confirm the correct measurement
being taken if none of them are lit.
2.3.1

X-Z Fault

This LED signals that voltage between terminals X and Z exceeds 30V peak.
There are four possible causes:
• the resistance of the current circuit between X and Z is too high
• interference voltage in the current circuit is too high
• the fuse is blown
• the circuit is open (lead not connected)
2.3.2

X-Y High Resistance

This LED signals that the resistance in the voltage circuit (between Xv and
Y or X and Y) is too high (approx 50kΩ) or that the circuit may be open.
• Flashing will continue throughout the measurement, even if the
resistance drops below the threshold (e.g. after reconnecting or
lowering auxiliary rod resistance).
• In this case, you must release the push-button and press again
after the fault has been corrected.
• Occasionally, a stray voltage above 6V
light.
• Check the leads for a possible solution.
2.3.3

X-Y High Noise

This LED signals the presence of excessive noise (approx 13V peak) in
the voltage circuit (between Xv and Y or X and Y).
• One remedy is to use shielded leads from the instrument to the
auxiliary electrodes.
• Connect all the shields to the rod under test.
8
- Xv-Y High Resistance
(3640)
- Xv-Y High Noise
(3640)
Digital Ground Resistance Tester Model 3640 and 4610
(4610)
may also set off this
DC
(4610)