NF FRA51602, Instruction Manual

Page: 182 / 286

5.7 Amplitude compression
5
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FRA 51602
5.7 Amplitude compression
This function automatically controls the amplitude of the oscillator signal applied to the equipment under
test. By correcting for the frequency characteristics of the system being measured, measurement can be
performed with a constant amplitude applied to the DUT.
As illustrated in
Figure 5-12
, this instrument can automatically adjust the oscillator amplitude so that the
amplitude of the output of the equipment under test (EUT) A1 remains constant for the measurement,
regardless of the frequency characteristics of A1.
Figure 5-12 Example of using amplitude compression (gain-phase measurement)
An example of measuring impedance is illustrated in
Figure 5-13
. Regardless of the frequency
characteristics of the DUT or EUT, the measurement can be performed with a constant voltage amplitude
applied to the DUT itself. If amplitude control is performed for the output of CH2, measurement can be
performed at constant current.
Figure 5-13 Example of using amplitude compression (impedance measurement)
FRA51602
1
2
Z
～
Power Amp
DUT
Rsh
i
v
i × Rsh
A
1
The amplitude here should
be constant.
EUT
f
gain
A1 A2
FRA51602
CH1 OSC CH2