81
Measuring Components or Circuits
When automatically measuring an object with a large capacitance (such as a
capacitor)
Improving the reliability of insulation resistance measurement
Set the contact check function that checks connections (contacts) in the measurement circuit
including the measured object and the measurement xture.
See “4.12 Contact Check (Executing Contact Check, Setting Reference Value)” (p. 71).
Reducing the measurement time and improving the measurement accuracy
Pre-charge the measured object before measurement.
Connection to the CHARGE terminal (p. 33) and the following settings are required:
See “4.8 Setting Pre-charge” (p. 64) and “4.9 Limiting Current Flowing Through Measured Object
(Current Limiter)” (p. 65)
INPUT
GUARD
GROUND
CHARGE
OUTPUT
A
SM7110/SM7120
Measured
object
Charging
Measured
object
Negative side Positive side
Rx
Rc
Shorting plug
Measurement
voltage
source
−
+
Ammeter
Current limiter
Negative
side
Positive
side
Rc is the measured object after Rx.
Example of CHARGE terminal connection (A grounded measured object)
5
Measurement Methods Suitable for Various Objects to Be Measured
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