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

Example of Using the P Format
This example sends trace datatothe computer and backtothe spectrum analyzer using P
format.
Note The spectrum analyzer mustbeinthelog amplitude scale to use the TDF P
format.
1 REAL Trace_data(l:401) Declare an array for trace data.
10 OUTPUT 718;"IP;CF 300MHZ;SP 20MHZ;SNGLS;TS;" Zzke a measurement sweep.
20 OUTPUT 718;"TDF P;TRA?;" Activate the P format, output
trace A data.
30 ENTER 718;Trace_data(*) The computer receives trace A
40 OUTPUT 718;"VIEW TRA;MOV TRA,O;"
50 OUTPUT 718*"RL'*"
' * ,
60 DISP "PRESS CONTINUE WHEN READY"
70 PAUSE
80 ENTER 718;RefJevel
90 MAT Trace-data=Trace-data-(Ref-level)
100 MAT Trace,data=Trace-data*(lOO)
110 MAT Trace,data=Trace_data+(8000)
120 OUTPUT 718m"TRA I).
130 OUTPUT 718ITrace_data(*)
140 LOCAL 718
150 END
data from the spectrum analyzer
lb v&f@ that the trace data is
transferred back to the spectrum
analyzq set trace A to zeros.
Determine the amplitude of the
reference level. The amplitude
of the reference level is used to
change the integers sent to the
spectrum analyzer into real numbers.
Get the refsrence level.
These lines change the real trace
data (stored in Trace-data) into
integers (in measurem.ent units).
Sends the trace data back to the
spectrum analyzer in measurement
units.
The trace data is sent to the computer in parameter units. A parameter unit is a standard
scientific unit. For the TDF P format, the parameter unit depends on the current amplitude
units (dBm, dBmV, dBpV, V, W). Use the AUNITS command to change the units.
For more detailed information about the P format, see the description for TDF in Chapter 5.
Programming Topics 3-21