NF FRA5087, Instruction Manual

Page: 70 / 194

3.5 Examples of basic operations
FRA5087 3-30
3.5.4 Examples of connections
Typical examples of measurement connections are described in this section. In actual
measurement, be careful about the influence on the SUT of the common- and differential-mode
impedance of the oscillator output and analyzer input in the FRA5087.

Frequency characteristics measurement of amplifiers (1)
V
1
V
2
A
SUT
Fig. 3-14 Connection diagram for frequency characteristics measurement (1)
Connect V
1
with CH1 and V
2
with CH2, respectively.
The frequency transfer function of the SUT (system under test) can be obtained from the
following equation:
A
=
V
2
V
1
･
･
Set the measurement mode at (CH1 and CH2) and the analysis mode at (CH2/CH1) for the
FRA
5087 , to display the SUT frequency characteristics (gain and phase versus frequency) on the
LCD screen so that you can directly read them through the display.

Frequency characteristics measurement of amplifiers (2)
V
1
V
2
SUT
A
Fig. 3-15 Connection diagram for frequency characteristics measurement (2)
The diagram above shows the connection for measurement of the transfer function of A (only for
A) in the SUT.
The transfer function of A can be obtained from the following equation:
A
=
V
2
V
1
･
･
Set the analysis mode at (CH2/CH1) for the FRA 5087 to display the frequency characteristics
(gain and phase versus frequency) of A on the LCD screen so that you can directly read them
through the display.