4.9 Setting the Contact Check
4-43 ZM2376
Detecting abnormal low capacitance
When a low capacitance is measured due to a contact failure, it is regarded as Low C (abnormal low
capacitance) in ZM2376. Exactly, it is regarded as Low C when an impedance higher than the
impedance corresponding to the specified capacitance is detected.
Low C: Low capacitance check setting menu is as follows.
ON/OFF Low capacitance limit
Low C check:OFF Cth:123.456pF Current setting
0)OFF 1)ON 2)Cth Options
OFF Disables the low capacitance check (initial value).
ON Enables the low capacitance check.
Cth Displays the low capacitance limit setting menu.
If a setting is made or the EXIT operation is performed, the measurement screen comes back.
Cth: Low capacitance limit setting menu is as follows.
C threshold: 12.3456 pF Current setting
0.0000p to 999.999n Available value ranges
Set the upper limit value of capacitance that should be regarded as abnormal.
When it is set to zero (initial value), the low capacitance check is not conducted even if it is
enabled.
If a setting is made or the EXIT operation is performed, one-previous menu comes back.
If the low capacitance check acquires a measured value of impedance higher than 100 times of the
upper limit of the recommended range for the measurement range (except the highest measurement
range used in the current measurement frequency), it is regarded as Low C regardless of the low
capacitance limit.
When it is regarded as Low C:
Panel display
LoC status is displayed whether or not the comparator function is enabled/disabled.
Cp:+0.23456pF D:+0.12345 LoC 1.00000k
Comparator
The comparison is conducted as usual on the assumption that the measured value can be obtained.
Handler interface
/NC signal is at low level when the comparator function is enabled.
Measured value output in the remote control
The measured value is output as usual. It is never an error value.
The measurement status is displayed as 2, which indicates a contact failure.
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