Tektronix CMD 80, User Manual, Page: 331 / 672

Audio Measurements
3–258
CMD 80 Digital Radiocommunication Tester User Manual
Fundamental Frequency
After you make the necessary test connections, press the AUDIO MEASURE-
MENT softkey to display the AUDIO MEASUREMENT menu shown in
Figure 3–210.
Figure 3–210: Audio measurement menu
The tester produces an audio signal whose frequency and level you set using the
softkeys for the AF GENERATOR. You also select which filter to use (C-MES-
SAGE or CCITT). You can then measure the unfiltered peak, the filtered peak, or
the filtered RMS audio voltage of the mobile station.
H
HARMONIC DISTORTION. Press this softkey to display the menu used to
measure harmonic distortion. Refer to Harmonic Distortion on page 3–259.
H
HOLDOFF TIME. Press this softkey to set a time delay between the start (or
change) of an audio source and the acquisition of measurement data. This
allows the transients induced by the mobile station to settle before data is
accumulated.
H
FILTER. Press this softkey to toggle between a C-MESSAGE or CCITT
filter.
In the AF GENERATOR section of the menu, you can make the following
settings:
H
FREQUENCY. Press this softkey to set the frequency of the sinusoidal test
tone generated by the AF Generator (300 Hz to 3300 Hz).
H
LEVEL. Press this softkey to adjust the RMS output voltage of the AF
Generator (0 to 5 V
RMS
).