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Performance Verification
AM700 Audio Measurement Set Service Manual
4–47
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. Remake the check.
of step 3. Reset the sample rate to 48 kHz when you are done with the checks.
Check the Digital Out and AES REF Out as follows:
1. Set the DUT as follows:
a. Touch Interface Ampl soft key.
Set XLR Output = 5.00 Vp-p
2. Connect the AES REF OUT to the differential oscilloscope input using an
unterminated dual BNC to dual XLR cable adapter (shown in Figure 4–19).
1
2
3
2
3
1
BNC Female
XLR Female
XLR Male
Cable used is insulated coax.
Figure 4–19: Dual BNC to dual XLR cable adapter
3. Record the open-circuit output level as measured from the oscilloscope.
Ignore the overshoot caused by the cable, and measure at the center of tilt (if
tilt is present in the signal display).
4. Connect a precision 110 W resistor between pin 2 and pin 3 of the open end
of the dual XLR adapter cable or use the 110 W XLR to BNC cable adapter
Check Input and Output
Impedance