Table B-4: Accuracy And Flatness Specifications; Check Level Measurement Accuracy And Flatness - Tektronix VM700T User Manual

Appendix B: Verification Procedure

Check Level Measurement Accuracy and Flatness

Specifications Checked
Option 41 Level
Accuracy and Flatness
B-10
NOTE. If you change audio input and source files and then decide to exit the
directory and cancel the change, you must press the
followed by the
to exit the Source Selection Audio directory and cancel any changes by asking
you to touch the
This procedure verifies flatness and measurement accuracy by checking signal
levels at specified frequencies.
NOTE. Frequencies and levels checked are not specified in this procedure. If the
measurement accuracy of certain frequencies and levels is important to your
application, we recommend that your test procedure include those frequencies
and levels.
Table B-4 lists audio option accuracy and flatness specifications.

Table B-4: Accuracy and Flatness Specifications

Frequency Range Level Range
20 – 40 Hz – 20 dBu
– 20 dBu to – 50 dBu
– 50 dBu to – 60 dBu
– 60 dBu to – 70 dBu
40 Hz – 20 kHz – 20 dBu
– 20 dBu to – 50 dBu
– 50 dBu to – 60 dBu
– 60 dBu to – 70 dBu
a
Level difference between channels is 0.2 dB at levels of –50 dBu and greater.
1. Power on the VM700T and associated test equipment and let them warm up
for 20 minutes.
2. Connect the sine-wave generator to the Option 41 audio input connector as
in Figure B-3.
3. Press the Measure hard key, select Audio, and run the audio analyzer
measurement.
VM700T Option 40/41/42 Audio Measurements User Manual
soft key. The VM700T verifies that you want
soft key again.
Accuracy
a
(includes flatness)
+ 0.3 / – 0.2 dB
+ 0.4 / – 0.3 dB
+ 0.6 / – 0.5 dB
1.0 dB
0.2 dB
0.3 dB
0.5 dB
1.0 dB
soft key,
Flatness
+ 0.1 / – 0.2 dB
+ 0.1 / – 0.2 dB
+ 0.2 / – 0.3 dB
+ 0.4 / – 0.5 dB
0.1 dB
0.1 dB
0.2 dB
0.4 dB