4.2 Setting Basic Settings of Measurement Conditions
54
Relationship between the measurement signal mode of the instrument and the sample is as follows.
About the test signal mode
For setting range and accuracy
Output impedance
Object under
test
CC
CV
HL
V
Constant current (CC) mode
You should select this if you wish
to set the current passing through
the object to be tested to a con-
stant value.
Constant voltage (CV) mode
You should select this if you wish to set the
voltage across the terminals of the object
to be tested to a constant value.
Open circuit voltage (V) mode
This voltage value is the value which is applied across the two terminals of
the series combination of the object which is being tested and the output
impedance. As for the voltage which is applied across the terminals of the
object which is being tested (by itself), if required, you should either check
the monitor voltage value, or select constant voltage (CV) and set a voltage
value across these terminals.
Open circuit voltage (V) mode and Constant voltage (CV) mode setting
Measurement mode (p. 72) Normal mode Low Z high accuracy mode
Open circuit voltage setting range 0.005 V to 5.000 V 0.005 V to 2.500 V
Open circuit voltage accuracy ±10%rdg. ±10 mV ±10%rdg. ±10 mV
Output impedance 100 ±10 25 ±5
Depending on the sample, you may not be able to perform constant voltage measurement. In
this situation, the following mark will be displayed:
Constant voltage measurement will not be performed.
Change the constant voltage level so that it is less than or equal to the displayed Vac moni-
tor values.
Example: Range in which constant voltage operation is supported when measuring a 1 F
C at 10 kHz
The sample impedance
Zm is as follows:
Xm
1–
2
fC
-----------------=
Zm = Rm + jXm = 0 [
] - j15.9 [
]
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