Filter
Top Products
Performance Verification
AM700 Audio Measurement Set Service Manual
4–45
8. Press the Rescale button and check that any other spurs found are below
–40 dBUI.
1. Connect the test AM700 as follows:
Test AM700 Digital Out to DUT Digital In (XLR)
2. Set the DUT controls as follows:
Press Digital button
Touch icon Eye Diagram soft key
Press Menu button
Touch Eye/Jitter Detection soft key
Select LF Rejection = 120 Hz
Select Jitter Gain = x1
3. Do a calibration of the DUT as follows:
Press Configure button
Touch System Setup soft key
Touch Calibrate soft key
Touch Calibrate Now soft key
Touch Accept Changes soft key
4. Set the test AM700 controls as follows:
Press Jitter Generation soft key
Select Generate Jitter Sine
Set Jitter Ampl = 0 UIpp
Press GENERATOR On button
5. Record the peak-to-peak jitter from the DUT. This is “120 Hz residual”
(0.03–0.05 UI). The specification is 120 Hz residual: 0.03 – 0.045 UI (p-p
jitter).
6. Set the DUT LF Rejection to 1200 Hz, “1200 Hz residual” The specification
is 1200 Hz residual: 0.03 – 0.045 UI (p-p jitter).
NOTE. If the residual peak-to-peak jitter exceeds 0.05 UI, change the sample
frequency on the test AM700 to 44.1 kHz as follows: press the Menu button,
touch the Digital Audio soft key, touch the Sample Rate soft key; rotate the large
knob to select 44.1 kHz, and press enter to make the change. Reset the sample
rate to 48 kHz when you are done with the checks.
7. Set the Test AM jitter amplitudes and frequencies and DUT LF Rejection as
indicated in Table 4–11, and check that the Jitter measurement is within the
measurement accuracy range shown. Record the measurements in the table.
Check Peak-to-Peak Jitter
Measurement Accuracy