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WFM 1125 Option 0A/0B/0C/0D Service Manual
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, and confirm that the amplitude is 1000 mV " 100 mV.
3. Using the oscilloscope measurement function, perform the rise and fall time
measurements, confirm that the rise and fall times are within the range from
30 ns to 44 ns.
4. Change the BNC cable from the AUDIO CHA connector to the AUDIO
CHB connector.
5. Repeat steps from 1 to 3.
6. Disconnect the BNC cable, the BNC T connector, and the 75 W terminator
from the AUDIO CHB connector on the waveform monitor and CH1
connector on the oscilloscope.
7. Change the connections to as follows:
a. Connect the AUDIO CHA and AUDIO CHB outputs from the waveform
monitor rear panel to the digital audio monitor CH1–2 AUDIO and
CH3-4 AUDIO BNC inputs, respectively, using the 75 W BNC cables.
b. Terminate the other side of the loop–through to the CH1-2 AUDIO and
CH3–4 AUDIO input with the 75 W terminators.
8. On the digital audio monitor front panel, press MENU button to display the
menu.
9. Select Inputs items from the menu, and select "CH1–2 input: BNC–unbal-
anced" and "CH3–4 input:BNC–unbalanced" items from the submenu.
10. On the digital audio monitor front panel, press the CLEAR MENU button
to clear the menu.
11. On the digital audio monitor front panel, press the VIEW AUDIO button
and SESSION button to display AUDIO/SESSION view.
12. In the view, confirm Highest true peaks are –20 dBFS, Sample rates are
48.00 kHz, and Active Bits are 20.
13. On the digital audio monitor, press the CH STATUS button to display
CHANNEL STATUS view.
. . . . . . . . . . . .
CH1
–140 mV
Performance Verification
4-17
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