Option 40; Check Level Measurement Accuracy And Flatness; Specifications Checked; Option 40 Level Accuracy And Flatness - Tektronix VM700T User Manual

Option 40

Check Level Measurement Accuracy and Flatness

Specifications Checked

Option 40 Level
Accuracy and Flatness
VM700T Option 40/41/42 Audio Measurements User Manual
Use the following procedures to check the Option 40 Audio Option.
This procedure verifies flatness and measurement accuracy by checking signal
levels at specified frequencies.
NOTE. The actual 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-2 lists audio option accuracy and flatness specifications.

Table B-2: 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 VM700T audio option left and right
mini-XLR input connectors. See Figure B-1 for an example of cabling.
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
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
B-3