Tektronix PSM3000 Series, User Manual

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Pulse Pro fi ling Application
To move or place a particular marker, the Pointer Control mode (found in the
Display Control toolbar and in the Results window) must be set to Markers
(
).
Once a marker is turned on and the pointer mode is set to Markers, you can click
and drag on the Measurement area to position the marker. As you move the
marker, the notation in the upper left corner of the Measurement grid will be
updated. The
x value (time) is determined by the position of the cursor. The
y value (magnitude) is determined by the value of the trace closest to that point
in time.
NOTE.
Only one marker can be active at a time, although all fi ve markers can
be displayed simultaneously. The active marker will have an asterisk (*) next to
its number in the toolbar and the marker number will be underlined and appear
slightly larger in the trace display.
A Normal Marker ( ) is a single data point and appears above the Measurement
trace.
A Delta Marker ( ) gives the differential value and appears below the
Measurement trace. To use a Delta marker, do the following:
NOTE.
There is a procedure in this document for making a measurement using
markers. (See page 48, Make a Marker Measurement.)
Arrow Icons.
The arrow icons allow you to position the markers on a peak. The
fi rst arrow icon allows you to center the highlight trace on a marker.
All Mrkrs Off.
Select to turn off and reset all markers. You will lose marker
positioning if you click this button.
Measurement Threshold.
Select to view the Threshold window where you can set
the threshold value, enable the threshold, or return the threshold to a default value.
The measurement threshold sets the minimum value of the peaks considered by
the marker and gate search algorithms. It is adjustable across the limits of the
dynamic range of the instrument. The default setting is -55 dBm and the function
must be enabled/disabled from the dialog box.
NOTE.
The Measurement Threshold function is also used to set the lower limit
of data used in gated measurements.
Pulse Criteria. Select to view the Pulse window where you can set the threshold
value, enable the threshold, or return the threshold to a default value. This
function is used to de
fi ne that portion of the total trace that is to be considered
RF and Microwave Power Sensors/Meters 41