Hioki DSM-8542, Instruction Manual, Page: 81 / 140

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(1) Setting automatic voltage check
Press [SHIFT] [F3] V.CK on the setting screen referring to 4.5 “Display Screen”
and
5.2.1
“Screen types.” Select on the screen whether to (execute · not execute)
monitoring of the measuring voltage automatically.
Selection made for voltage checks will be indicated by a side mark.
The side mark will flash in case the result of a voltage check is not acceptable.
6.7.2 Contact check
Capacitors with defective insulation are judged “acceptable” in capacitor measurement if
measurement is made while the measuring jig of the measuring system is not contacting
a capacitor. To prevent these errors, this function checks whether or not the measuring
terminal is contacting a capacitor after measurement is made. This function is one of
the features of the meter.
“CONTACT ERROR” (a sample is not connected) is displayed when the capacity of the
measuring system becomes smaller than the reference value for contact check. Check
the meter and measuring jig.
Detection is made by detecting the electrostatic capacity and this function cannot be
used with samples whose electrostatic capacity component is small such as pure
resistance.
The cable length is predetermined because an electrostatic capacity of the measuring
cable enters the jig capacity in parallel. The measuring cable length was adjusted to 1m
during a preshipment inspection at the factory. Readjustment will be necessary if a
longer cable is required. However, the maximum cable length guaranteed for detection
accuracy is 2m. The cable length can be lengthened up to about 4m if the electrostatic
capacity of a sample is several thousand pF or higher. Nevertheless, the jig capacity
offset capacity will deteriorate and errors of more than 50% will result. (Errors are
±20% or less if the cable length is 1m)
Contact checks are made in an auto execute mode, in which checks are made for each
measurement, and in a single execute mode in which checks are made by keying the
panel keys or by interface commands when needed.
(1) Setting auto contact check execute
Press [SHIFT] [F4] C.CK on the setting screen referring to 4.5 “Display Screen”
and 5.2.1 “Screen types.” Select on the screen whether to (execute · not
execute) contact check during measurement.
Selection made for contact checks will be indicated by a side mark.
The side mark will flash in case the result of a voltage check is not acceptable.
[Notice]
Measurement and data output will be made as normal even if a decision of
contact check is <NG>. However, signals will not be saved in the data buffer if
the result of a contact check is <NG>.