Stimulus-Related Values - HP 8753E Programming And Command Reference Manual

Stimulus-Related Values

Frequency-related values are calculated for the analyzer display. The
start and stop frequencies or center and span frequencies of the selected
frequency range are available to the programmer.
In a linear frequency range, the frequency values can be easily
calculated because the trace data points are equally spaced across the
trace. Relating the data from a linear frequency sweep to frequency can
be done by querying the start frequency, the frequency span, and the
number of points in the trace.
Given that information, the frequency of point n in a linear-frequency
sweep is represented by the equation:
F = Start frequency + (n- 1) x Span/(Points- 1)
In most cases, this is an easy solution for determining the related
frequency value that corresponds with a data point. This technique
is illustrated in "Example 3B: Data Transfer Using FORM 4 (ASCII
Format)," located in HP R4SIC Programming Examples Guide.
When using log sweep or a list-frequency sweep, the points are not
evenly spaced over the frequency range of the sweep. In these cases,
an effective way of determining the frequencies of the current sweep is
to use the OUTPLIML command. Although this command is normally
used for limit lines, it can also be used to identify all of the frequency
points in a sweep. Limit lines do not need to be on in order to read
the frequencies directly out of the instrument with the OUTPLIML
command. Refer to "Example 3D: Data Transfer Using Frequency Array
Information," located in HP R4SIC Programming Examples Guide.
Note
Another method of identifying all of the frequency
points in a sweep is to use the marker commands
MARKBUCKx and OUTPMARK in a FOR NEXT
programming loop that corresponds to the number of
points in the sweep. MARKBUCKx places a marker
at a point in the sweep, where x is the number of
the point in a sweep, and OUTPMARK outputs the
stimulus value as part of the marker data.
HP-IB Programming and Command Reference Guide