3156B User Manual
Maintenance and Performance Checks 6-12
Racal Instrument © 2005
Flatness,
Modulation
Waveforms
Equipment
: Oscilloscope
Preparation
:
1. Configure the Oscilloscope as follows:
Termination: 20dB, 50
Ω
feedthrough attenuator
Setup:
As required for the test
2. Connect 3156B Channel 1/2 output to the oscilloscope input.
Place the feedthrough attenuator at the oscilloscope inputs
3. Configure the 3156B channels 1/2 as follows:
Reset
Waveform
Mode:
MOD
Frequency:
Initially, 1kHz then, as required by the test
Amplitude:
6V
Output:
On
Test Procedure
1. Adjust the vertical controls of the Oscilloscope to get 6 division of
display
2. Perform Sine flatness, Modulation waveforms tests on both
channels using Table 5-12
Table 6-12 Sinewave Flatness, Modulation Waveforms Tests
3156B Sine
Oscilloscope Reading
Frequency
Error Limits
CH 1
CH 2
Pass
Fail
1kHz 6
Divisions
Reference
Reference
X
X
1MHz
6± 0.2 Divisions
10MHz
6± 0.6 Divisions
25MHz
6± 0.9 Divisions
Trigger Operation
Trigger, Gate and
Burst
Equipment
: Oscilloscope, function generator, counter
Preparation
:
1. Configure the Oscilloscope as follows:
Termination: 20dB, 50
Ω
feedthrough attenuator
Setup:
As required for the test
2. Connect 3156B Channel 1/2 output to the oscilloscope input.
Place the feedthrough attenuator at the oscilloscope inputs
3. Configure the function generator as follows:
Frequency: 10kHz
Run Mode:
As required by the test
Wave:
TTL level Square from the main output.