Hioki IM3533, Инструкция по эксплуатации

Страница: 63 / 400

4.2 Setting Basic Settings of Measurement Conditions
55
4
Chapte
r 4
LCR Function
The constant current operation range differs depending on the test sample to be measured.
The impedance Zm ' observed from the generator is as follows:
Accordingly, the voltage Vm across both leads of the sample is as follows:
Because the generator output voltage range is 5[mV] to 5[V], the CV operation range per
the above expression is
Vm = 0.8[mV] to 0.78[V].
In low Z high accuracy mode, the output resistance
Ro
becomes 25 [

].
Ro
: Output resistance (100 [

])
Zm'
=
Ro
+
Zm
=
100
[

] -
j15.9
[

]
Vm
Zm Vo

Zm

----------------------
15.9

Vo

101.3

 
--------------------------
= =
Vo
: generator output
| Zm' |
15.9
[

]
×
Vo
Constant current (CC) mode setting
Measurement mode (p. 72) Normal mode Low Z high accuracy mode
Constant current setting range 0.01 mA to 50.00 mA 0.01 mA to 100.00 mA
Constant current accuracy ±10%rdg. ±10

A ±10%rdg. ±10

A
Output impedance 100

±10

25

±5

Testing some types of sample is not possible using constant current. In this case, the following
symbol appears on the display:
Constant current measurement will not be performed.
Change the constant current level so that it is less than or equal to the displayed Iac monitor
values.
Example: When a 1 mH impedance is measured at 1 kHz, the CC operation range can be
obtained as follows.
Sample impedance Zm becomes as follows:
The impedance
Zm'
observed from the generator is as follows:
Accordingly, the current Im across both leads of the sample is as follows:
Because the generator output voltage range is 5 [mV] to 5 [V] (see the table of page 54),
the CC operation range per the above expression is
Im = 49.9[

A] to 49.9[mA].
In low Z high accuracy mode, the output resistance
Ro
becomes 25 [

].
Xm 2

fL =
Zm
=
Rm
+
jXm
=
0
[

] -
j6.28
[

]
Ro
: output resistance (100 [

])
Zm'
=
Ro
+
Zm
=
100
[

] -
j6.28
[

]
Im
Vo
Zm

------------
Vo
118.1

------------------ = =
Vo
: generator output
| Zm' |
Vo
100.2
[

]