Hioki PW8001-01, Инструкция по эксплуатации

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234
Troubleshooting
Issue Cause
Solution and where to find
additional information
Frequency cannot be
measured, or measured values
are unstable.
The input frequency is set outside
the range of 0.1 Hz to 2 MHz.
Check the frequency by viewing the
input waveform.
See “4 Waveform Display
Method” (p. 95).
The input frequency is lower than
the set frequency.
Set the measurement lower
frequency limit setting.
See “Measurement upper frequency
limit and lower frequency limit
(configuring frequency measuring
range)” (p. 61).
The synchronization source input
is incorrect.
The synchronization source input
range is too large.
Check the synchronization source
setting.
See “Synchronization source”
(p. 58),
“Voltage range and current range”
(p. 54)
A severely distorted waveform,
such as a PWM waveform, is
measured.
Set the zero-cross filter to
[ON]
.
See “ZCF (Zero-cross filter)”
(p. 101).
Three-phase voltage
measurement results low.
Phase voltages are measured
with the
Δ
-Y conversion function.
Turn off the
Δ
-Y conversion function.
See “
Δ
–Y conversion” (p. 111).
Measured power values are
anomalous.
The instrument is incorrectly
connected.
Check the instrument’s connection.
See “2.9 Checking Connections”
(p. 49).
The rectifier and LPF settings is
improperly configured.
Set the rectifier properly.
If the LPF is enabled, set it to [OFF] .
See “Rectification method” (p. 62).
“Low-pass filter (LPF)” (p. 60)
The current reading never falls
to zero even when receiving
zero-input.
A Universal Clamp On CT is used
with a lower current range.
The current sensor’s high-
frequency noise may be affecting
the current reading.
Perform zero adjustment after setting
the LPF to 100 kHz.
See “Low-pass filter (LPF)” (p. 60).
“2.8 Connecting Measurement
Leads and Sensors to Lines to Be
Measured” (p. 47)
The apparent power, reactive
power, and power factor
readings on the secondary-
side of an inverter differ from
measurements obtained using
other instruments.
Voltage values are higher than
expected.
The rectifier settings are not
the same as those on the other
instruments.
Use the same rectifier setting as with
the other instruments.
See “Rectification method” (p. 62).
The calculation methods differ. Use the same calculation methods
as with the other instruments.
See “5.6 Power Calculation Method”
(p. 113).
Motor RPM cannot be
measured.
The pulse output is set to other
than voltage output.
The instrument cannot detect
open collector pulse output.
Set the device to voltage output to
match the Ch. B pulse input setting.
The pulse output contains noise. Check the cable routing.
Ground the encoder that generate
the pulse output.
Specify the pulse noise filter (PNF).
See “Pulse noise filter (PNF)”
(p. 85).
HIOKI PW8001A961-00