Sony Tektronix WFM 1125 Service Manual page 108

Adjustment Procedures
Audio Output Adjustment
5-10
Connections.
Connect AUDIO CHA connector from the waveform monitor rear panel to the
oscilloscope CH1 input using the 75 W BNC cable and the BNC T connector.
Terminate the other side of the BNC T connector with the 75 W terminator.
Initial Setups.
Oscilloscope:
Waveform: . . . . . . . . . . . . . . .
Vertical scale: . . . . . . . . . . . . .
Vertical Offset:
Vertical Position:
Horizontal Scale:
Trigger mode: . . . . . . . . . . . . .
Trigger Source:
Trigger Level: . . . . . . . . . . . . .
Procedure.
1. Align the 0 mV level of the displayed signal with the center graticule on the
oscilloscope.
2. Using the oscilloscope measurement function, perform the amplitude
measurement.
3. Verify and adjust the A10 R166 so that the amplitude is 1.00 V
4. Change the BNC cable from the AUDIO CHA connector to the AUDIO
CHB connector.
5. Align the 0 mV level of the displayed signal with the center graticule on the
oscilloscope.
6. Using the oscilloscope measurement function, perform the amplitude
measurement.
7. Verify and adjust the A10 R172 so that the amplitude is 1.00 V
CH1
200 mV/div
. . . . . . . . . . . . 0 V
. . . . . . . . . . Center
. . . . . . . . . . 100 ns/div
EDGE
. . . . . . . . . . . . CH1
–140 mV
WFM 1125 Option 0A/0B/0C/0D Service Manual