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Modulated
Waveforms
Characteristics
(n)PSK
Test Results
Test Results
This tests the operation of the modulation circuits. It includes tests for
the (n)PSK and for the (n)QAM modulation functions. When in this
mode, each two channels 1-2 and 3-4 are generate in parallel the
same modulation function however, each couple can be programmed
to generate a different modulation type.
Equipment: Oscilloscope
Preparation:
1.
Configure the oscilloscope as follows:
Time Base:
Sampling Rate: 50 MS/s at least.
Trace View:
Amplitude:
2.
Connect 2074 Channel 1 output to the oscilloscope input,
channel 1
3.
Connect the 2074 Channel 2 output to the oscilloscope input,
channel 2
4.
Configure model 2074 controls on channels 1 and 2 as follows:
Waveform:
Modulation:
PSK Type:
CW Control:
CH1 Output:
CH2 Output:
Test Procedure:
1.
Load Demo table to the 8PSK Data Table
2.
Set oscilloscope and verify 8PSK constellation trace on the
oscilloscope
Pass
3.
Modify 2074 PSK Type to 16PSK
4.
Load Demo table to the 16PSK Data Table
5.
Verify 16PSK constellation trace on the oscilloscope
Pass
Performance Checks
200 μs
X-Y
1 V/div
Modulated
nPSK
8PSK
Off
On
On
Fail
Fail
6
Test Procedures
6-19
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