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

Saving Trace Data
The trace data in the previous program can be stored on a computer disk by making three
program modifications.
10 !FILE: "IBPROGG"
20 !create a 401 point trace array:
30 REAL Trace,a(l:401)
40 Analyzer=718
50 OUTPUT Analyzer;"IP;"
60 !set the output format of the spectrum analyzer for
70 !real numbers:
80 OUTPUT Analyzer;"TDF P;"
90 !set the spectrum analyzer parameters:
100 OUTPUT Analyzer;"SNGLS;"
110 OUTPUT Analyzer;"CF 300MZ;"
120 OUTPUT Analyzer;"SP 200MZ;"
130 OUTPUT Analyzer;"TS;"
140 OUTPUT Analyzer;"MKPK HI;"
150 !move peak to center of spectrum analyzer screen:
160 OUTPUT Analyzer;"MKCF;"
170 OUTPUT Analyzer;"TS;"
180 !ask the spectrum analyzer for trace data:
190 OUTPUT Analyzer;"TRA?;"
200 !send the trace data to the computer:
210 ENTER Analyzer;Trace-a(*)
220 !create file to store trace
230 !file is 13 records long:
240 CREATE BDAT "DATA-A",13
250 !assign path for the file:
260 ASSIGN @File TO "DATA-A"
270 !send trace data to the file:
280 OUTPUT OFile;Trace,a(*)
290 OUTPUT Analyzer;"CONTS;"
300 LOCAL 7
310 !close file:
320 ASSIGN @File TO *
330 END
First, using the CREATE command, we create an empty file on the disk for storing the trace.
The file is 13 records long. (To determine the number of records, the 401-point trace is
multiplied by 8 bytes per point, the storage required for real numbers, then divided by 256
bytes per record. The result is rounded to the next largest integer.)
Next, we assign an input and an output path to the file DATA-A. Then, we send the trace data
to the file. (See lines 260 through 280.) Finally, in line 320, we close the file.
Note If a program containing the CREATE command is run twice, the computer will
report an error the second time because the file already exists. To prevent this
error, place an exclamation mark before the CREATE command to “comment
out” the line after the first run. (See line 240.)
3-4 Programming Topics