LOCAL OPERATION
3-18
AF Distn, SINAD, S/N Averages:
When distortion or SINAD tests are made to receivers using the Rx TEST mode or AF TEST
mode, the results displayed are obtained by averaging the results of a number of measurements.
This allows the user to balance the speed of testing against greater repeatability of measurement.
The number of measurements made can be set within the range 1 to 20 by entering the required
figure using the data input keys.
Each measurement is made using a certain number of noise samples; this variable can be changed,
as follows.
Noise Samples (X10):
This allows the number of noise samples used in each noise and distortion measurement to be
changed. Numbers of samples are displayed in tens, up to a maximum of 200 samples. More
noise samples should be used when the signal measurement is stable but the residual is noisy;
fewer samples should be used when the signal is less stable.
S………………..S………………..S…….
One measurement =
Average of
N
noise samples (
.)
Signal (S)
(
N
is a multiple of 10)
S….S….S….S….S….S….S..
Displayed result is the rolling average of a number of measurements.
Fig. 3-5 Relationship of measurement and number of samples
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