3156B User Manual
Racal Instrument © 2005
Maintenance and Performance Checks 6-27
Test Procedure
1. Using WaveCAD, select Enable On
2. Verify re-triggered FM burst operation on the oscilloscope as
follows:
Waveform:
Repetitive bursts of 5-cycle sine waveforms
Sine
Frequency:
10kHz
Re-trigger Delay: 200
μ
s
Max
A:
1.5MHz
Min
A:
500kHz
Test Results
Pass
Fail
FM – Arb
Waveforms,
Continuous Run
Mode
Equipment
: Oscilloscope (LeCroy LT342, fitted with jitter package)
Preparation
:
1. Configure the oscilloscope as follows:
Time Base:
0.1 ms
Sampling Rate: 50MS/s at least.
Trace A View: Jitter, Type: FREQ, CLK.
Trigger source: Channel 2, positive slope
Amplitude:
1V/div
2. Connect 3156B Channel 1 output to the oscilloscope input,
channel 1
3. Connect the 3156B SYNC output to the oscilloscope input,
channel 2
4. Configure the 3156B channels 1/2 as follows:
Reset
Wave Mode: Modulation
Modulation Mode: FM
Modulating Wave: Arbitrary
Carrier Frequency: 1MHz
Modulating
Frequency:
10kHz
FM
SCLK:
5MS/s
Sync:
On
Output:
On
Enable:
On
5. Using WaveCAD, open the FM Composer and download the
following waveform:
Wavelength: 20000
points
Waveform:
20 cycles sinewave
Deviation
:
0.5MHz
Test Procedure
1. Verify FM operation on the oscilloscope as follows:
Waveform: Sine
Period:
5kHz
Max
A:
1.5MHz
Min
A:
500kHz