138 Chapter 2
Front-Panel Key Reference
Meas Setup
Harmonic Distortion Meas Setup Menu Keys
To access the following keys for setting up a harmonic distortion
measurement, press
MEASURE, Harmonic Distortion and then the
front-panel
Meas Setup key.
Avg Number
On Off
Press Avg Number (On) to specify the number of averages used when
calculating the measurement result. The average will be displayed at
the end of each sweep. (Off) disables measurement averaging.
Key Access:
Meas Setup
Avg Mode
Exp Repeat
Allows you to select the type of termination control used for the
averaging function. This determines the averaging action after the
specified number of measurements (average count) is reached.
Avg Mode has no effect on measurements that are not averaged.
Exp Each successive data acquisition after the average
count is reached is exponentially weighted and
combined with the existing average. Exponential
averaging weights new data more than old data, which
facilitates tracking of slow-changing signals.
Repeat After reaching the average count, all previous result
data is cleared and the average count is set back to 1.
Key Access:
Meas Setup
Harmonics Harmonics
indicates the number of harmonics to measure before
computing the total harmonic distortion. The minimum number is 2
(only the fundamental and second harmonic will be measured). The
maximum number is 10.
Key Access:
Meas Setup
ST/Harmonic
Auto Man
ST/Harmonic
(Auto) sets the sweeptime to 200 divided by the resolution
bandwidth or 10 ms, whichever is greater.
ST/Harmonic (Man) allows
you to specify any sweeptime from 10 ms to the analyzer maximum.
This sweeptime is used only for measuring harmonics. The sweeptime
set before the measurement began is used for finding the fundamental.
Key Access:
Meas Setup
Optimize
Ref Level
Sets the reference level and attenuator to optimum values based on the
signal present at the input.
Key Access:
Meas Setup
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