3156B User Manual
Racal Instrument © 2005
Maintenance and Performance Checks 6-33
Digital Patterns –
Simulated Bursts
Equipment
: Oscilloscope, Digital pattern test board, Dual DC power
supply
Preparation
:
1. Turn chassis power OFF
2. C5V and -5V to the test board
3. Hook up the test board on the channel 1 digital output connector
4. Turn chassis power ON
5. Turn power supply power ON
NOTE
Do not attempt to connect the test board to the 3156B
connector while power is ON as this may result in
permanent damage to the 3156B. Always turn chassis
power OFF before connecting or disconnecting the test
board to the 3156B.
6. Connect 3156B Channel 1 output to the oscilloscope input,
channel 1
7. Configure the 3156B channel 1 as follows:
Reset
Data
Frequency:1pps
Wave Mode: Digital
Digital Mode: Stimulus
Run
Mode: Burst
Burst
Count: 5
8. Using WaveCAD, open the Digital Pattern Stim List Table,
prepare and download the following table:
Index
Stim List (hex)
1
1
2
2
3
4
4
8
5
10
6
20
7
40
8
80
9
100
10
200
11
400
12
800
Test Procedure
1. Using WaveCAD, press the Enable On button
2. Watch the LED’s on the test board. The 12 MSD LED’s light in
sequence. Each LED lights for about 1 second. The sequence is
repeated for 5 times, then stops on the last step
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