NARDA PMM 9010 Series, User Manual

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RMS-AVG and C-AVG Detectors A-A-5
A-A.5.2 Smart
Detector The Smart Detector is an innovative special function implemented in the
PMM 9010 receiver with the purpose of reducing the test time and increasing
the productivity of the lab.
This function works only when at least one limit is loaded, therefore
remember to enable a limit to run the Smart detector function.
Selecting one out of the five Smart detectors the receiver will execute the
scan using at first the Peak detector and, if a peak value is found over the
selected limit minus a
Margin set with the specific button, the reading is re-
measured and displayed with the chosen (C-Avg, AVG, C-Rms, RMS or
QPeak) detector.
Obviously this way of operation results in a much faster scan sweep and
moreover it immediately draws the attention of the test Engineer to the most
critical points. The limit associated to the Margin is displayed as a bold black
line and is automatically selected by the receiver depending which Smart
detector is chosen; for example, if a Smart QP is selected, the associated QP
limit line will be displayed as a bold black line.
It is immediately clear that this function is very useful to dramatically reduce
test time and increase the productivity of the test lab.
To deselect the Smart Detector function simply select a single detector.
The weighting time must be properly set in the Hold Time window to
allow the Smart detectors functions to operate as intended.
The Hold Time is the measurement time the receiver takes to value the input
signal and form result weighted by the selected detector.
When using the
C-Avg (CISPR-Average) or the C-RMS (CISPR-RMS)
detector, since for definition they are characterized by a long time constant,
the minimum measurement time should be set long enough to allow a correct
measurement.
For this reason,
when unknown signal are to be measured, the Hold Time
should be at least 1000ms to correctly weight signals pulsed at a rate of 5
Hz or faster.
With the Peak, RMS and AVG detectors the smallest settable
measurement time depends on the RBW.
If several detectors are used contemporarily the Hold Time should be set
to meet the requirement of the slowest one, so that the results of the
measurement are correct for all them.
When a frequency change or an attenuation variation occurs, PMM 9010
waits automatically the time needed to the internal circuits to overcome the
transient before the measurement time starts again.
PMM 9010 can be remotely controlled also when it is connected to its
options such as 9030/9060/9180 and Click meter Switching operation
Box.