HP 8590 E & L Series Spectrum Analyzers and HP 8591C Cable TV ...

Example
COMPRESS Compress Trace
This example compresses trace B into “C-0MPTRAC” using the positive (POS) algorithm.
10 OUTPUT 718."IP-"
20 OUTPUT 718;"TR;EF C-OMPTRAC,lOO;"
30 OUTPUT 718 ;“BLANK TRA; SNGLS;"
40 OUTPUT 718;"CLRW TRB;TS;"
50 OUTPUT 718;"COMPRESS C-OMPTRAC,TRB,POS;"
60 OUTPUT 718;"BLANK TRB;"
70 OUTPUT 718;"MOV TRA,C-OMPTRAC;"
80 OUTPUT 718;"VIEW TRA;"
90 END
Description
Initializes spectrum analyz4x
Creates a trace called C-OMFTRACwith
a length of 100 elements.
Blanks trace A, activates single-sweep
mode.
Measures with trace B
Compresses trace B into C-OMFTRAC.
Blanks trace B
Moves C-OMPTRAC into trace A.
Displays the result.
The COMPRESS command stores a compressed copy of the source trace into a smaller
destination trace. The source trace is divided into the same number of intervals as there are
points in the destination trace, and the data within each interval are compressed into the value
for the corresponding destination trace point. The algorithm used to compress the data is given
as an parameter to the command.
The algorithms available are as follows:
AVERAGE
@W
NORMAL
NW
The average of the points within an interval is used.
NRM computes the compressed value of the interval by using a rosenfell
algorithm. The rosenfell algorithm is a mathematical operation defined in
spectrum analyzer firmware. The algorithm compresses a locally continuously
rising or falling signal into the peak value detected in each interval. If the
detected signal is not continuously rising or falling, then the data value
alternates between minimum and maximum in the compressed interval.
This shows the peak-to-peak noise variations. The rosenfell option is useful
for accurately displaying noise, because peak detection can give misleading
representation of noise.
NEGATIVE The lowest value in each interval is used.
(NW
POSITIVE Specifying POS selects the highest point in the interval as the compressed
(PW value.
SAMPLE (SMP) Specifying SMP selects the last point in the interval as the compressed value.
PEAK The PKAVG algorithm selects the difference between the peak and the average
AVERAGE value of the interval as the compressed value.
(PKAVG)
PEAK PIT The PKPIT algorithm returns the difference between the positive and the
(PKPIT) negative peaks within the interval.
Programming Commands 5-l 13