Hioki IM3536 - X84; How to Supply a DC Bias Voltage

Appx.7
Supplying DC Bias
How to supply a DC bias voltage
WARNING
• In order to avoid electric shock accident, be absolutely sure not to touch the
test terminals while the DC bias voltage is being supplied to them.
• Do not short circuit between the H and L of the measurement cable, probe, or
xture with the DC bias voltage still being supplied. Doing so may damage the
measurement cable, probe, or xture or cause a short circuit accident.
• If you disconnect the sample under test from the test terminals with the DC bias
voltage still being supplied, then the test sample is left charged, which is very
dangerous. In order to avoid electric shock.
CAUTION
When measuring the element whose DC resistance is not high enough, DC current will
ow to the main unit and the measurement will not be performed properly.
When you want to apply a DC voltage bias, refer to the following explanation.
Example: When applying a DC voltage bias to a capacitor or other test sample
DC Bias Voltage Circuit
IM3536
Z
Measurement
sample
+
-
DC voltage
source
+
-
H
CUR
H
POT
R
HC
R
HP
C
HC
C
HP
Capacitor R or L (>>Z)
L
POT
L
CUR
GUARD
• 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
Ω
) while a H
POT
capacitor must have a small enough imped-
ance to the R
HP
.
• Be careful about the polarity when connecting together the measurement cables, probes, or x-
tures 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 voltage, so you should wait for a certain stabilization time period (which depends upon the
sample) before performing.
• After testing is completed, drop the voltage of the DC voltage source to zero, and remove the
sample under test from the measurement cables, probes or xtures after having discharged any
electric charge which may have built up.
• If you have removed the sample under test from the measurement cables, probes or xtures with-
out rst having discharged the accumulated electric charge, you should be careful to do so imme-
diately.
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Appx.
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