Table B-5: Example Test Signals For Level And Flatness Test; Figure B-3: Option 41 Cable Connections For Level Accuracy And Flatness Check - Tektronix VM700T User Manual

VM700T Option 40/41/42 Audio Measurements User Manual

Figure B-3: Option 41 cable connections for level accuracy and flatness check

4. Using a known accurate sine-wave generator (or one verified with an
accurate AC voltmeter), apply a 120 Hz input to the Audio option at
amplitudes –20 dBu (for example, +18, +8, –2, and –12 dBu) and verify
that the level accuracy is 0.1 dB.
5. Select at least 6 frequencies and 10 amplitudes to test. The frequencies and
amplitudes you select must be in the ranges listed in Table B-2 (use a signal
amplitude level of –70 dBu to test for worst case). Table B-5 shows an
example selection of test frequencies and amplitudes.
6. Set the sine-wave generator for each of the selected frequencies and
amplitudes.
a. Record the level of each frequency.
b. Verify that the measured levels recorded for each frequency are within
the flatness specification given in Table B-2 on page B-3.
Table B-5:
Example Test Signals for Level and Flatness Test
Frequency
30 Hz
100 Hz
1 kHz
5 kHz
12 kHz
20 kHz
7. Repeat step 5 for channels B and C.
Appendix B: Verification Procedure
To Option 41 Audio
Input Connector
Amplitudes
–10 dBu, –21 dBu, –40 dBu, –49 dBu,
–51 dBu, –55 dBu, –59 dBu,
–61 dBu, –65 dBu, –70 dBu
B-11