Hioki DSM-8542, Instruction Manual, Page: 82 / 140

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[Notice]
Be certain to set an open correction value when using the contact check function.
Otherwise errors will result. A side mark (“
◄
”) will be lit in the “OPEN SET”
window in the lower left of the front panel when open correction is executed once.
[Notice]
When an external power source other than the dedicated power supply unit is
connected or when the contact check function is used, be sure to impress
measuring voltage. Quickly turn voltage off as soon as measurement ends.
[Warning]
In open correction, measuring voltage is momentarily output to the measuring
terminal. Carefully check that no hand or other body part is contacting the jig or
measuring circuit before pressing the [OPEN] key.
Maximum 1000V voltage is output and an electric shock is a hazardous possibility.
(2) Open correction value setting
Set a decision capacity in contact check when setting an open correction value.
Press the [OPEN] (SET OPEN CHECK PARAMETER) key on the measurement
screen. The screen will change to the screen to set a reference value for
contact check. (See Fig. 6.10)
Ｏ Ｐ Ｅ Ｎ Ｏ Ｆ Ｆ Ｓ Ｅ Ｔ Ｖ Ａ Ｌ Ｕ Ｅ
Ｃ Ｈ １ Ｏ Ｐ Ｅ Ｎ ＝ ２ ． ５ ｐ Ｆ ｗ ｏ ｒ ｋ ： ［ ０ ． ５ ］ ｐ Ｆ
Ｃ Ｈ ２ Ｏ Ｐ Ｅ Ｎ ＝ ２ ． ５ ｐ Ｆ ｗ ｏ ｒ ｋ ： ［ ０ ． ５ ］ ｐ Ｆ
Ｃ Ｈ ３ Ｏ Ｐ Ｅ Ｎ ＝ ２ ． ５ ｐ Ｆ ｗ ｏ ｒ ｋ ： ［ ０ ． ５ ］ ｐ Ｆ
Ｃ Ｈ ４ Ｏ Ｐ Ｅ Ｎ ＝ ２ ． ５ ｐ Ｆ ｗ ｏ ｒ ｋ ： ［ ０ ． ５ ］ ｐ Ｆ
Ｃ ｏ ｒ ｒ ｅ ｃ ｔ Ｇ Ｏ ： Ｃ Ｈ １ Ｃ Ｈ ２ Ｃ Ｈ ３ Ｃ Ｈ ４
Ｃ ｏ ｒ ｒ ｅ ｃ ｔ Ｎ Ｏ ： Ｎ ｏ ｎ ｅ
Ｒ Ｔ Ｒ Ｙ
▼
Fig. 6.10 Open Correction Value Setting Screen
Displaying this screen, the open capacity of the measurement system will be measured
and the following data will be displayed:
OPEN = x.xpF work
The function key [F5] will change to the RTRY (RETRY) function. Pressing the [F5]
RTRY key will redo measurement of the open capacity value of the measuring system.
(3) Setting decision capacity reference value
A minimum capacity value of a sample is set operating the numeric keys. (0.5
to 99.9)
The minimum capacity value is 1/10 the open capacity value of the measured
measuring system or 0.5pF, whichever is larger.
The reference value for contact checks is a total of the open capacity value of
the measured measuring system and of a 1/2 value of the set capacity value.
Contact NG will result if the capacity is smaller than this value.