Hioki IM3533, Instruction Manual

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Appendix
Appendix5 Supplying DC Bias
A7
Supplying DC bias means that a DC voltage is supplied as a bias to a sample for test whose characteristics
are voltage dependent, such as an electrolytic capacitor or a ceramic capacitor.
Further, a DC current can be supplied as a bias to a sample for test whose characteristics are current depen-
dent, such as a choke coil.
This instrument does not provide a DC bias input terminal. DC bias should be applied using the method
described below.
When you want to apply a DC voltage bias, refer to the following explanation.
Apply a DC voltage bias to a capacitor or other test sample as shown below.
• Use a resistance (R) or inductance (L) which has a large enough impedance with reference to the sample
under test (Z).
• A H
CUR
side capacitor must have a small enough impedance (i.e. a large enough capacitance) relative to
the output resistance (100

) while a H
POT
capacitor must have a small enough impedance to the R
HP
.
• Be careful about the polarity when connecting together the probes, the sample to be tested, and the DC
voltage source.
• It takes a little time for the DC voltage which is being supplied to the sample under test to reach the set volt-
age, so you should wait for a certain stabilization time period (which depends upon the sample) before per-
forming.
• After testing is completed, drop the voltage of the DC voltage source to zero, and remove the sample under
test from the probes after having discharged any electric charge which may have built up.
• If you have removed the sample under test from the probes without first having discharged the accumulated
electric charge, you should be careful to do so immediately.
Appendix5 Supplying DC Bias
A voltage must not be applied to the measurement terminals of the instrument from an
external source.
If a voltage is applied from an external source, the instrument may be damaged.
Appendix5.1 How to Supply a DC Bias Voltage
DC Bias Voltage Circuit
IM3533
Capacitor
C
HC
C
HP
Z
+
-
H
CUR
H
POT
L
POT
L
CUR
+
-
DC voltage source
R or L (>>Z)
GUARD
Sample to be tested
R
HP
R
HC