ADCMT 12704A, Operation Manual

3-6 

12704A Resistivity Chamber Operation Manual

3.2    Setting the Electrodes and a Sample

3.2  Setting the Electrodes and a Sample 

Use a sample that meets the following conditions. Measure the thickness of the 
sample previously with a vernier caliper or micrometer. 



85 mm diameter or more 



150 (W) × 5 (H) × 110 (D) mm or less 

(1)

Open the cover and check that the conductive rubber main electrode and ring electrode do 
not stick out of the plates respectively. 

(2)

Select volume resistivity measurement or surface resistivity measurement by the RESIS-
TIVITY switch. 

Volume resistivity measurement: Set the RESISTIVITY switch to VOLUME. 
Surface resistivity measurement: Set the RESISTIVITY switch to SURFACE. 

(3)

Set the PROTECTOR switch. 

ON:  If a sample is short-circuited due to insulation breakdown, the electrodes will be 

damaged. In such a case, turn the switch to ON. 
1 M



 is added to measured values. It takes longer time to reach a true value after 

measurement starts. 

OFF:  If there is no possibility that a sample is short-circuited, turn the switch to OFF. 

When the current limit of the V SOURCE is 10 mA or less and the generated volt-
age is 10 V or less, measurement can be done with the switch set to OFF even if 
there is a possibility that the sample is short-circuited. 

(4)

Set a sample onto the main electrode and the guard electrode so as to cover them com-
pletely. 

(5)

Pass the feed terminal through the two holes on the opposed electrode, and press the op-
posed electrode down to the end to stick fast to the sample. 

(6)

Close and lock the cover. 

Open the cover and make sure that the applied voltage switch is OFF or voltage is 
not being applied when operating the RESISTIVITY switch. Operating the switch 
with voltage being applied will cause damage to the switch.

CAUTION

WARNING