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9. INTRODUNTION OF OPTIONS
With the SM-8200 Series super megohmmeters, any of the following options
can be provided as needed. However, note that some of them can be installed
at factory.
9-1 G uard T ip
1) Applications
1)-1 In a measurement of the insulation resistance of a cap acitive samp le,
the op tional guard tip is used as a charging tip .
1)-2 In a measurement of the high insulation resistance, the op tional
guard tip is used to guard the sample from the surface current of the
sample support made of insulation materials to obtain more re liable
data.
2) Usage
2 )-1 Charg ing T ip
(1) Before connecting the measuring plug of the red measuring rod to
the Rx “
‑
“ terminals, mount the guard tip on the measuring p lug as
shown in Fig. 9.1.1.
Fig. 9.1.1
(2) After mounting the guard tip, connect the measuring rod to the Rx
“
‑
“
measuring
terminals.
(3 ) Connect the black measuring rod to the samp le to measure.
(4 ) Press the MEASURE switch.
(5) Connect the guard tip of the red measuring rod to the sample to
charge.
(6) When an appropriate period (See Note.) of charging time has passed,
connect the measuring tip of the rod to the sample in place of the
guard tip.
Note 1: When changing the guard tip connection to the measuring
tip connection, a spark may occur, depending upon the
capacitance of the sample.
ー
ッ
ッ
1)
2)
T u rn c l o ck w i s e
t o f i t
Sample end of the
red measuring rod
Gu a r d T i p
Me a s u r in g T i p
Guard Tip
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