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Performance Verification
4–26
AM700 Audio Measurement Set Service Manual
1. Press the Menu button and touch Input Selection soft key.
2. If not already done, in the Input Configuration control panel, set the
generator to analyzer connection to internal. Set the Ch 1 and Ch 2 analyzer
inputs to High BW mode by touching the Analog HBW Inputs soft key.
3. Set the CH A and CH B input ranges to manual (Auto unchecked).
4. Set the analog generator to High BW mode (this automatically sets the B
generator to follow mode).
5. Check the frequency measurement and THD + N at 3.5 V and 1 kHz for both
CH 1 and CH 2 in the RT display window. THD + N should be less than or
equal to 0.003%, typically less than or equal to 0.0015%.
6. Set the frequency and amplitude to the values shown in Table 4–6 and check
the amplitude reading in the RT display window. Manually change the
analyzer input range as you change the generator voltages until you are
satisfied that the manual ranging works. You can select Auto Range at any
time to finish the checks. The amplitude measurement accuracy with respect
to 120 Hz is are defined in the Specification section.
NOTE. Keep in mind that the analog generator you are using may have some
high frequency rolloff (verified earlier in this procedure for the AM700 gener-
ator). This step checks the analyzer functionality and is not a check of its
specified measurement accuracy to determine if readjustment is required. The
specified accuracy for 80 kHz is ±1 dB or ≈ 10% relative to the 120 Hz level
measurement.
Table 4–6: High bandwidth analyzer checks
Voltage Channel 120 Hz (reference
frequency) (117.19 Hz)
11.719 Hz 20 kHz 80 kHz (79.993 kHz)
24 V Ch 1 Level Do not check 80 kHz at
24 volts. The AM700
Ch 2 Level
generator is specified to
a maximum of 19.45 V
at 80 kHz.
15.2 V Ch 1 Level
Ch 2 Level
7.6 V Ch 1 Level
Ch 2 Level
3.8 V Ch 1 Level
Ch 2 Level
Check High BW Mode