Racal Instruments 3162A/B, User Manual

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User Manual 3162A/B
Maintenance and Performance Checks 5-18
If not otherwise specified, configure the instrument to
factory defaults before each adjustment by sending the
*RST command. Always connect the output BNC connector
through a 50
Ω Ω
feedthrough termination.
Sample Clock Duty
Cycle Adjustment
Equipment: Oscilloscope (HP 64616B), 10/1 Probe
1. Configure the Model 3162B as follows:
Function: Sine
Frequency: 200 MHz
Remote Commands: :RES
:OUTP ON
:FREQ 200e6
2. Connect the probe between U62 pin 2 and ground (on the A channel
engine board). Adjust R28 for 50% duty cycle.
Pulse Response
Adjustment
Equipment: Oscilloscope (HP 64616B), 20dB Attenuator
1. Configure the Model 3162B as follows:
Function: Square
Frequency: 10 MHz
Amplitude: 3 V
Remote Commands: :RES
:FREQ 10e6
:FUNC:SHAP SQU
:VOLT 3
:OUTP ON
Channel A Adjustment
2. Connect the A channel output through 20dB attenuator to the
oscilloscope input.
3. Set oscilloscope input impedance to 50
Ω
. Set the oscilloscope
vertical gain and time base, and adjust main board C8 for best pulse
response.
4. Change the Model 3162B frequency setting to 10 kHz.
5. Remove the 3162B signal from the oscilloscope and adjust the vertical
position to be exactly on the center of the trace.
6. Reconnect the 3162B output to the oscilloscope and adjust R7 for best
symmetry around the vertical centerline.