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Performance Verification
AM700 Audio Measurement Set Service Manual
4–39
4. Setup the oscilloscope to view the signal. Typical settings are as follows:
Time/Div 50 ns/div
Volts/Div 1 V/div
Trigger Normal
Trigger Source CH 3 (trigger input)
Trigger Level Auto
CH 1 and CH 2 On
5. Check on the oscilloscope, that the time from REF zero crossing to Main
zero crossing is less than 50 ns.
1. Connect DUT Digital Out to a differential oscilloscope inputs using the
110 W XLR to dual BNC adapter cable shown in Figure 4–18.
2. Set the oscilloscope controls for ADD, INVERT ON, and set CH 1 and CH 2
OFF.
3. Set DUT:
Touch Interface Amplitude soft key
Set XLR Output for the following:
0.01 Vp-p
0.1 Vp-p
1 Vp-p
5 Vp-p
8 Vp-p
10 Vp-p
4. At each setting, check that the oscilloscope reads the same (±10 mV ±5%).
5. Disconnect the Digital Out signal from the oscilloscope.
6. Connect DUT Unbalanced Out to the oscilloscope input using a 75 W BNC
coaxial cable and a 75 W feed through termination. On the oscilloscope, turn
off ADD and INVERT.
7. Set the DUT as follows:
Touch Interface Amplitude soft key
Set BNC Output for the following:
0.02 Vp-p
0.2 Vp-p
1 Vp-p
2 Vp-p
8. For each voltage setting in step 7, check that the oscilloscope reads the same
(±2 mV ±2%).
Output Level