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Performance Verification
AM700 Audio Measurement Set Service Manual
4–49
Check the UNBALANCE OUT AND IN impedance as follows:
1. Connect the UNBALANCE OUT connector to the oscilloscope with 48 inch
or shorter 75 W cable.
2. Record the open circuit output level as measured with the oscilloscope.
3. Terminate the cable at the oscilloscope using BNC tee connector and
0.025%, 75 W termination.
4. Record the terminated output level.
5. Calculate the ratio of the input-terminated level to open-circuit level.
6. Check that this ratio is in the range of 0.48 to 0.52.
7. Remove the precision termination and connect the open end of the tee to the
UNBALANCED IN connector with a 75 W cable.
8. Calculate the ratio of the input-terminated level to the precision-terminated
level.
9. Check that this ratio is in the range of 0.98 to 1.02.
Check the OPTICAL IN and OPTICAL OUT as follows:
1. Set the DUT for as follows:
a. Touch the Icon Eye Diagram soft key.
b. Set the Eye/Jitter Detection to 120 Hz.
c. Press the Configure button.
d. Touch the Input Selection soft key.
e. Select RP Optical.
f. Press the Clear Menu button.
2. Connect a 1-meter plastic optical fiber cable from the OPTICAL OUT
connector to the OPTICAL IN connector.
3. Check for normal eye with 0.08 UIp-p or less jitter with a Main Channel
Level in the range of 2 V to 3 Vp-p.
NOTE. If the residual peak-to-peak jitter exceeds 0.08 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. Remake the check
of step 3. Reset the sample rate to 48 kHz when you are done with the checks.