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

Reading Trace Data from a Computer Disk
If we want to return trace data to the spectrum analyzer for later viewing, we must work
the “saving” process in reverse. The following program reads a trace previously stored on a
computer disk and stores the trace in an array variable.
Program Example for the HP-IB Interface
10 !FILE: "IBPROG7"
20 !create a 401-point trace array:
30 REAL Trace-a(l:401)
40 !assign path to the file with the
50 !trace in it:
60 ASSIGN @File TO "DATA-A"
70 !enter trace into variable Trace-a:
80 ENTER QFile;Trace-a(*)
90 !close file:
100 ASSIGN OFile TO *
110 END
First, in line 30, the program creates a 401-point trace array. Then, in line 60, the program
assigns a path to the trace file. Finally, in line 80, the program sends the trace data to the
variable Trace-N *).
Program Example for the RS-232 Interface
10 'File = 232PROG7
20 OPEN "COMl:9600,N,8,1" AS #l
30 'create a 401-point trace array
40 DIM TRCA(401)
50 'assign number to file with trace data in it
60 OPEN "TRACEA" FOR INPUT AS #2
70 'enter the trace into the array
80 FOR I=1 TO 401
90 INPUT #2,TRCA(I)
100 NEXT I
110 CLOSE
120 END
First, in line 40, the program creates a 401-point trace array. Then, in lines 60 through 100, the
program reads the disk file TRACEA and stores data in the array variable TRCA.
3-6 Programming Topics