4.7 Setting the Contact Check
4-29 ZM2371/ZM2372
Contact check during signal acquisition
Once the real time check is set to enabled, it is possible to detect only the contact failure of
H
CUR
terminal even during signal acquisition. This function may not affect on impedance
measurement besides there is no additional time incurred.
Select the Real time with the contact check setting menu, and the following real time check
setting menu is displayed.
Real time check:OFF Current setting
0)OFF 1)ON Options
OFF Disables the real time check
ON Enables the real time check (initial value)
Perform the EXIT operation to return to one-previous menu.
After setting, the results appear for a short time and return to one-previous menu.
Only when setting both real time check and contact check to enabled, the real time check
will run.
Operational outline of real time check
The real time check of ZM2372 allows checking the relation between drive signal and
measured values of voltage, current and impedance of DUT when obtaining the measured
results of AC impedance. If the above relation is extremely different from the one in normal
operation, it is regarded as contact failure.
Also when measurement signal gets an error due to the damaged drive signal source (H
CUR
),
it is afrade to be regarded as the contact failure. Always use the voltage/current monitor of
auxiliary display to check the voltage and current when great fluctuation in measured
values, which suggests an abnormal operation, is generated.
Restrictions for real time check
Only when the impedance of DUT is less than approx 100kΩ, the real time check enables the
contact failure of H
CUR
terminal to be detected.
If the total of H
CUR
connection cable impedance and normal contact resistance exceeds the
following approximate permissible value, it is possible to be justified as the contact failure in
real time check.
・Permissible value=20Ω in case of 100Ω in output impedance
・Permissible value=10Ω in case of 25Ω in output impedance
・Permissible value= 5Ω in case of 5Ω in output impedance
When frequently or always justified as contact failure due to the large impedance of
connection cable despite that the contact is normal, set the real time check to disabled.
It is impossible to detect the contact failure of H
POT
, L
POT
and L
CUR
terminal in real time
check. The real time check is used for the measurement of AC impedance but not applied for
the measurement of DC resistance Rdc.
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