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Automating Measurements
Automated Measurement Setup and Control
You may want to quickly and iteratively change the analyzer’s parameters
and monitor their effect on your device under test. This section describes
how to quickly change a parameter, take a sweep, and query a marker.
For example, when measuring an amplifier, you may wish to quickly choose
the optimal input power to the amplifier which will result in a maximum
output of + 10
do so, you can set the analyzer’s source power
level, then measure the amplifier’s output, and then change the analyzer’s
source power in the direction that will cause the measured signal to approach
the desired value. This process can be repeated
the measured
output is within some specified range of the target value.
When data at only a single frequency is needed, you can achieve the fastest
possible sweep by selecting a CW frequency and setting the number of points
to the minimum value of 3. A SCPI marker command can be used to read the
trace value.
Using this approach, you can typically achieve 3 to 5 sweeps per second.
Following is a listing of an example program named
that can be
found on
your Programs Disk.
100
DIM
110 DIM
120 !
130 IF ID”) 871”) THEN
140 ASSIGN TO 800
150
ELSE
160 ASSIGN TO 716
170 ABORT 7
180 CLEAR 716
190 END IF
200 !
210 ! PRESET, to ensure known state.
220 OUTPUT
230
240
!
250
! Set up the analyzer to measure 3 data points.
260
OUTPUT
270 !
7-50