Sweep Mode Operating Instructions 4-54.2.2.2 Detector This menu allows the operator to select the most appropriate detector forthe test.In Sweep mode the Peak, Average, RMS (Root Mean Square) and Quasi-Peak detectors are available and can be selected via the appropriate button.Hold time (ms)The Hold Time (expressed in milliseconds) represents the time the receiveruses to “take a snapshot” of the incoming signal and to measure it with thechosen detector. When selecting a detector, the default hold time value isautomatically loaded, but in some cases this time is not appropriate, e.g.when the interference signals have a low repetition rate. In this case thePMM 9010 sees a high input signal and therefore tries to set the properattenuation automatically increasing the value or the input attenuators.However, when the input attenuation is set the signal is gone, so thereceiver lowers the attenuation, but then a new peak arrives, and so on andso forth.On the other hand, if the Hold Time is too high the PMM 9010 cannotproperly follow the signals.In this situation the Hold Time value should be manually set to find a correctcompromise.To set the Hold Time to the lowest possible value (this value dynamicallydepends from the measurement conditions), enter the figure 0; if a valuelower than the allowed is entered, the lowest possible value is automaticallyselected.The max. Hold Time that can be set is 30 sec (30.000 ms).4.2.2.3 Smart Detector The Smart Detector is an innovative special function implemented in thePMM 9010 receiver with the purpose of reducing the test time andincreasing the productivity of the lab.This function works only when at least one limit is loaded, thereforeremember to enable a limit to run the Smart detector function.Selecting one out of the three Smart detectors the receiver will execute thescan using at first the Peak detector and, if a peak value is found over theselected limit minus a Margin set with the specific button, the reading is re-measured and displayed with the chosen (AVG, RMS or QPeak) detector.Obviously this way of operation results in a much faster scan sweep andmoreover it immediately draws the attention of the test Engineer to the mostcritical points. The limit associated to the Margin is displayed as a bold blackline and is automatically selected by the receiver depending which Smartdetector is chosen; for example, if a Smart QP is selected, the associatedQP limit line will be displayed as a bold black line.The Smart RMS detector is disabled until a reference limit is defined byCISPR.It is immediately clear that this function is very useful to dramatically reducetest 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 toallow the Smart detectors functions to operate as intended.
