Filter
Top Products
Performance Verification
4–14
AM700 Audio Measurement Set Service Manual
The measured RMS voltage should be within 0.1 dB (≈1%) of the generator
setting at 120 Hz (the reference frequency). The measured RMS voltage at
10 Hz and 1 kHz should be within ±0.1 dB (≈1%) of the measured RMS
voltage at 120 Hz. At 20 kHz, the measured RMS should be within +0.1 to
–0.2 dB (≈+1% to –2%) of the measured RMS voltage at 120 Hz.
Table 4–3: High resolution generator checks
Voltage Channel 120 Hz (reference
frequency)
10 Hz 1 kHz 20 kHz
24.5 V Ch A Voltage
Ch B Voltage
8 V Ch A Voltage
Ch B Voltage
4 V Ch A Voltage
Ch B Voltage
2 V Ch A Voltage
Ch B Voltage
1 V Ch A Voltage
Ch B Voltage
0.5 V Ch A Voltage
Ch B Voltage
0.25 V Ch A Voltage
Ch B Voltage
125 mV Ch A Voltage
Ch B Voltage
62.5 mV Ch A Voltage
Ch B Voltage
1. In the Generator Controls, set the generator to High Resolution Mode if not
already in that mode.
2. Use the Frequency and Amplitude edit boxes in the Waveform Control
screen to set the Ch A and Ch B frequency to 1 kHz at 3.5 V.
3. Set the external distortion analyzer measurement bandwidth to Audio or
22 kHz. Check the THD + N using the external distortion analyzer. (It should
be about 0.005%.)
4. Press the Control button in the generator section if the Generator Control
panel is not still displayed.
Check Low
Distortion Mode