Hioki DSM-8542, Instruction Manual, Page: 75 / 140

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Ｅ Ｌ Ｅ Ｃ Ｔ Ｒ Ｏ Ｄ Ｅ Ｓ Ｉ Ｚ Ｅ
Ｄ １ （ Ｉ Ｎ Ｄ Ｉ Ａ Ｍ Ｅ Ｔ Ｅ Ｒ ） ： ［ ２ ６ ． ０ ］ ｍ ｍ
Ｄ ２ （ Ｏ Ｕ Ｔ Ｄ Ｉ Ａ Ｍ Ｅ Ｔ Ｅ Ｒ ） ： ［ ３ ８ ． ０ ］ ｍ ｍ
ｔ （ Ｔ Ｈ Ｉ Ｃ Ｋ Ｎ Ｅ Ｓ Ｓ ） ： ［ ０ ． １ ０ ０ ］ ｍ ｍ
Ｄ Ｏ Ｗ Ｎ Ｕ Ｐ Ａ Ｃ Ｔ Ｌ
Fig. 6.4 Electrode Constant Setting Screen (Disc Electrode)
On the screen illustrated in Fig. 6.4, the function keys [F2], [F3] and [F5] will change to
DOWN, UP and ACTL respectively. The [F2] DOWN and [F3] UP keys are used for
selecting the constants preset in the meter. When setting a value other than specified
values, select the item desired to set by operating the [
▲
] and [
▼
] keys and input the
value by keying the numeric keys.
(3) Specified value of electrode constant
The meter has the following values as specified values.
D1, D2 Specified value of
electrode diameter Specified value of sample
thickness
If D1 = 26, D2 = 38
If D1 = 50, D2 = 70
If D1 = 70, D2 = 90
If D1 = 76, D2 = 88
t = 0.010 t = 2.000
t = 0.100 t = 5.000
t = 0.200 t = 10.000
t = 0.500 t = 20.000
t = 1.000 t = 30.000
Press the [ENTER] key after finishing setting. The screen will return to the
measurement screen. Select “surface resistivity measurement” or “volume resistivity
measurement” as the measuring mode by pressing the F2 [MODE] key.
6.3.4 Use of shielding box
In measurement of high insulation resistance, stable measurement is sometimes
hampered due to noise and induced current in the ambience as measurement is
high-sensitivity measurement of a current.
Samples need be placed in a shielding box when measuring samples of high insulation
resistance.
(1) Connection
An example of connection when a shielding box is used is illustrated in Fig. 6.5.
The diagram shows an example of connection between CH1 equipment and the
DSM-8542.