Check Distortion And Distortion Measurement Accuracy; Specification Checked; Option 41 Distortion Measurement Accuracy - Tektronix VM700T User Manual

Appendix B: Verification Procedure

Check Distortion and Distortion Measurement Accuracy

Specification Checked

Option 41 Distortion
Measurement Accuracy
Figure B-4: Option 41 cable connections for distortion measurement accuracy check
B-12
This procedure verifies that residual THD+N is
THD+N measurement accuracy by reading a known signal.
THD+N accuracy is 10% of the reading
of – 20 dBu and greater in a 33 Hz to 22 kHz bandwidth.
1. Check residual THD+N.
a. Apply a signal (between –20 dBu and +30 dBu) from a sine-wave
generator to the VM700T Audio Option. See to Figure B-4 for
connections.
b. Run the Audio Analyzer measurement and verify that residual THD+N
is 0.03% or less. An applied signal of +8 to +10 dBu yields an optimal
reading, while a –20 dBu signal yields a worst-case reading.
2. Check THD+N Measurement Accuracy.
a. With 600Ω output resistance selected, connect the outputs of two
sine-wave generators in parallel to the left channel of the dual female
XLR to DB-37 female adapter cable (see Figure B-4).
VM700T Option 40/41/42 Audio Measurements User Manual
0.03%, then checks the
1 digit for harmonics at input levels
To Option 41 Audio
Input Connector