NF FRA5087 - Table 4-4 Amplitude Compression Setting Items; Fig. 4-17 Example of Output Correction (70%)

4.9 Amplitude compression
FRA5087
4-25
Use the menu [Measure][AMPLITUDE COMPRESSION] to set the amplitude compression.
The menu compression setting items are indicated in Table 4-4.
Table 4-4 Amplitude compression setting items
Items
Descriptions
[FUNCTION]
To be set at “ON” when you want amplitude compression.
[REF CHANNEL]
To be used to set the channel (CH1 or CH2) for level monitoring.
[REF LEVEL]
To be used set the reference level to be measured in the [REF
CHANNEL].
[OUTPUT LIMIT]
To be used to set the oscillator maximum output voltage.
[ERROR]
To be used to set the permissible difference between the [REF
LEVEL] set value and the measured data.
[RETRY TIMES]
To be used to set the maximum repeatable number of
measurement.
[CORRECTION FACTOR]
To be used set the voltage correction factor.
An example of amplitude compression is shown below where the voltage correction factor
[CORRECTION FACTOR] has been set at 70 %. It is also assumed that the current oscillator
setting voltage is 1 V and the reference level [REF LEVEL] of the oscillator is 2 V.
0 1 2 3
1
2
1V
V
0
1.7V
V
1
1.91V
V
2
1.973V
V
3
Number of measurements n
Oscillator
output voltage
Output reference voltage V
G
=2V
V
n
=(V
G
-V
n-1
)×0.7+V
n-1
Fig. 4-17 Example of output correction (70 %)
Note that the oscillator output voltage is different from the amplitude set in the menu
[OSC][AMPLITUDE], even if you have disabled the amplitude compression function by setting
the [FUNCTION] at “off”.
！
CAUTION
Error message 15 may appear during amplitude compression. This is not a
malfunction.
See 7.1 error message.
Review [ERROR], [RETRY TIMES] and [CORRECTION FACTOR]
settings. Again conduct measurement.