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2074
User Manual
(n)QAM
Test Results
Test Results
SYNC Output
operation
6-20
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:
QAM Type:
CW Control:
CH1 Output:
CH2 Output:
Test Procedure:
1. Load Demo table to the 16QAM Data Table
2. Set oscilloscope and verify 16QAM constellation trace on the
oscilloscope
Pass
6.
Modify 2074 QAM Type to 64QAM
7.
Load Demo table to the 64QAM Data Table
8.
Verify 64QAM constellation trace on the oscilloscope
Pass
This tests the operation of the SYNC output. There are four separate
synchronization outputs, which are located on the rear panel. There
are two parameters being tested, the sync qualifier and the sync
position. The sync output has TTL level amplitude.
1 ms
X-Y
1 V/div
Modulated
nQAM
16QAM
Off
On
On
Fail
Fail
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