NF ZM2376 - Page 73

3.5 Basic Operations
3-39 ZM2376
Rd-min: The minimum output impedance setting menu is as follows.
R-drive min: 25Ω-1 Current setting
0)6Ω-100-f1k 1)25Ω-1 2)25Ω-100 3)100Ω Options
6Ω-100-f1k
For measurement ranges from 100mΩ to 100Ω, this sets the output
impedance to 6Ω.
25Ω-1
For measurement ranges from 100mΩ to 1Ω this sets the output impedance
to 25Ω (initial value).
25Ω-100
For measurement ranges from 100mΩ to 100Ω, this sets the output
impedance to 25Ω
100Ω
For all measurement ranges, this sets the output impedance to 100Ω.
If a setting is made or the EXIT operation is performed, one-previous menu comes back.
Each option has the following features:
6Ω-100-f1k : Suitable for large capacitance measurement.
 The settling time is short since the CR time constant is small.
 The variation of measured value is small since the measurement current is large.
 The measurement with almost constant voltage is possible since the voltage drop caused
by the output impedance is small.
 The distortion of signal voltage can be reduced even when DUT has nonlinear
voltage-current characteristics.
25Ω-1 : Suitable for general measurement.
When measuring low impedance, the measurement variation of low impedance can be
reduced since the measurement current is large.
25Ω-100 : When measuring a DUT which has nonlinear voltage-current characteristics, the
measured value can be in agreement with the value of an impedance measurement instrument
which has an equivalent output impedance of 25Ω.
This option allows you, for example, to measure the inductance of up to about 150µH within
the recommended range under the conditions of frequency = 1MHz, signal level = 0.5V, and
output impedance = 25Ω. When measuring larger inductances, since the impedance of DUT is
high. Measured values of the rate depending on the output impedance decreases.
100Ω : Suitable for measurement of inductors with core.
When measuring a DUT which has nonlinear voltage-current characteristics, the measured
value can be in agreement with the value of an impedance measurement instrument which has
an output impedance of 100Ω. Note that the variation may become large when measuring low
impedance (small inductance).