Audio Performance Verification Procedures
The following t
ests verify that the Audio module for the WFM6120, WFM7020,
and WFM7120 waveform monitors meets the warranted characteristics listed
in the Speci fi cations chapter. Characteristics with typical specifications (not
warranted) are also checked with pass/fail criteria.
Tests for Waveform Monitors Equipped with Audio Options
The tests in this section apply to instruments with Audio options installed. The
tests will note when tests or their steps apply only to specific audio options;
otherwise, they apply to all the audio options.
AES Sample
Rate Range
This test veri fi es that each AES input locks to an input signal.
Typical Operation Check. This test checks for typical operation. Typical values
are not g
uaranteed characteristics and are listed in the test record as pass / fail.
1. Set the waveform monitor to the factory presets. (See page 60, Restore the
Factor
yPresets.)
2. If the audio display is not selected, press the Display Select 4 button.
3. Connect the digital audio generator unbalanced (UNBAL) output to the AES
A 1-2 In BNC connector using a 75 Ω cable.
4. Set the digital audio generator as follows:
Control or S etting Value
Freq
uency
1kHz
Out
put Level
–20
dB FS Audio Tone
Sa
mple Frequency
96 kHz
Unbalanced V
p-
p
1.
000 V (Carrier Level)
5. Select the AES A input:
a
.
P
ress and hold the AUDIO button, select Audio Input, and then select
AES A.
b. Press the AUDIO button to close the menu.
6. Press the FULL button to make the audio tile the full screen display.
7. Check for an indication of –20 dB FS and no error messages in the
corresponding bars, and record Pass or Fail in the test record.
8. Move the audio generator output to each of the remaining AES A In
connectors and repeat step 7 for each conne ctor.
9. Set the digital audio generator Sample Frequency to 35 kHz.
Waveform Monitors Specifications and P erformance Verification 121
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