3.4 Viewing Harmonic Measured Values
77
3.4.4 About the HRM ERROR lamp
• 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.
Failure of the value to flash indicates that the upper limit value cannot be changed. Take the following
action to address the issue:
Status Solution and reference for more information
During integration operation
(RUN lamp lit up or flashing)
The upper limit value cannot be changed until the integrated value is reset (so that
the RUN lamp turns off).
See: "Canceling integration (resetting integrated values) (DATA RESET)" (p.65)
During display hold operation or
maximum value/minimum value
hold operation (HOLD, MIN, or
MAX lamp lit up)
The upper limit value cannot be changed until this operation is canceled (so that
the HOLD, MIN, or MAX lamp turns off).
See: "Canceling the display hold state" (p.106)
"Switching the display among the maximum, minimum, and instantaneous
values" (p.107)
If the upper limit does not flash
Accurate harmonic measurement cannot be
performed while the HRM lamp (ERROR) is
lit up.
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