6.1 Troubleshooting
165
If the HRM lamp (ERROR) lights up
If the PEAK OVER U or PEAK OVER I lamp lights up
These lamps will light up if the voltage input or current input waveform peak value exceeds the figures listed
below. At this time, the displayed data is not accurate.
• Voltage input waveform peak value: ±600% of the voltage range
When using the 300 V, 600 V, or 1,000 V range, ±1,500 V peak
• Current input waveform peak value: ±600% of the current range
When using the 20 A range, ±100 A peak
When no apparent cause can be established
Perform a system reset.
This will return all settings to their factory defaults.
See: 3.9.4 Initializing the Instrument (System Reset) (p.110)
• The HRM lamp (ERROR) will light up when the instrument receives input outside the synchronization fre-
quency range for harmonic measurement or if it is unable to perform harmonic measurement due to the
effects of noise. At that time, the instrument will show the invalid data display [- - - - -].
• Since measurement processing will be reset when integration starts, preventing harmonic analysis from
being performed properly during that interval, the HRM lamp (ERROR) will light up momentarily.
Error display Status Solution
PEAK OVER U
When greater than ±1,500 V
peak
Stop measurement immediately, deactivate power to measurement
lines, and disconnect wires.
When less than ±1,500 V peak The internal circuit is not operating properly. Switch to a range for
which the PEAK OVER U lamp does not light up.
See: 3.2.3 Selecting the Voltage and Current Ranges (p.43)
PEAK OVER I
When greater than ±60 A peak Stop measurement immediately, deactivate power to measurement
lines, and disconnect wires.
When less than ±60 A peak The internal circuit is not operating properly. Switch to a range for
which the PEAK OVER I lamp does not light up.
See: 3.2.3 Selecting the Voltage and Current Ranges (p.43)
Accurate harmonic measurement cannot be
performed while the HRM lamp (ERROR) is
lit up.
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