Hioki SM-8216, Instruction Manual, Page: 23 / 44

11
④
Rx ‘
‑
‘
/
’
+
’ Measuring Terminals: These terminals carry a selected
measuring voltage across them to measure the insulation
resistanceof a sample via a pair of measuring rods or electrodes.
The polarity of the terminals is as follows:
Rx ’–‘
measuring terminal: Red measuring rod
Rx ‘+’ measuring terminal: Black measuring rod.
Note: Each of the terminals is incorporated with a plug insertion
detector switch. Unless otherwise this switch is turned on
by afull insertion of the plug of the measuring rod
or electrode, theoutput voltage circuit cannot be
completed – no output.
⑤
MEASURE/CHARGE/DISCHARGE Function Selector Switch: This switch
selects the function of the unit. Before turning the power on,
be sureto set this switch to the DISCHARGE position. After turning
the power on, and connecting the Rx
‑/+
measuring terminals
to thesample to be measured, set the switch to the CHARGE
position. Keepit there for several seconds ( to be adjusted,
depending upon thecapacitance of the sample) to charge the
sample for a reliable measurement.
When the sample is completely charged, set the switch to the
MEASURE position.
For details of the charging time, see 6.2 Usage of the MEASURE/
CHARGE/DISCHARGE Function Switch.
Fig. 4.1.2 shows the MEASURE/CHARGE/DISCHARGE function
selector switch.
Fig. 4.1.3 Function Selector Switch
⑥
VOLTAGE Selector Switch: This switch selects the voltage to be applied
across the Rx
+/‑
measuring terminals. The arrow on the
knob shows a voltage to output.