Fast Iterative Control - HP 8711C User Manual

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 ampliner which will result in a maximum
output of + 10 dBm. 'lb do so, you can first 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 until the measured amplifier
output is within some speciEed 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 "FASTCW" that can be
found on your
7-50
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100
DIM
110 DIM Msg$[lOO]
!
120
IF POS(SYSTEM$("SYSTEM ID">,"HP 871") THEN
130
140 ASSIGN (8Hp8711 TO 800
150 ELSE
160 ASSIGN OHp8711 TO 716
170 ABORT 7
180 CLEAR 716
190 END IF
200 !
! PRESET, to ensure known state.
210
220 OUTPUT OHp87ll;"SYST:PRES;*WAI"
230
240 !
! Set up the analyzer to measure 3 data points.
250
OUTPUT 6Hp871l;"SENSl:SWE:POIN 3;*WAI"
260
270 !
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