Programmer’s Guide 6-17
Trace Data Transfers
Applying Gain Correction Using the Memory Trace
The following example BASIC code segment shows how to download a
complex array from your program to the analyzer's Memory trace. The
program's "Mem" array is initialized with the proper values such that
when the analyzer computes Data divided by Memory, the desired
increasing gain will be applied.
100 REAL Mem(1:201,1:2)
110 ASSIGN @Hp8711 TO 716
120 ! Fill memory array (denominator in Data/Mem)
130 ! with values that will result in an
140 ! upward sloping gain factor vs. frequency.
150 ! Used to compensate for cable loss vs. frequency
160 ! Adds 0 dB of gain at start freq; 3 dB at stop freq
170 FOR Pt=1 TO 201
180 Gain_factor_db=3.0*(Pt − 1)/200 ! 0..3 dB Power
190 Gain_factor_lin=10^(Gain_factor_db/20)
200 Mem(Pt,1)=1.0/Gain_factor_lin ! real
210 Mem(Pt,2)=0.0 ! imag
220 NEXT Pt
230 ! Download to the memory trace
240 OUTPUT @Hp8711;"FORM:DATA ASCII"
250 OUTPUT @Hp8711;"TRACE:DATA CH1SMEM"; ! Note the ";"
260 FOR Pt=1 TO 201
270 FOR I=1 TO 2
280 OUTPUT @Hp8711;",";Mem(Pt,I); ! Note the ";"
290 NEXT I
300 NEXT Pt
310 OUTPUT @Hp8711;"" ! Send linefeed
320 OUTPUT @Hp8711;"CALC1:MATH (IMPL/CH1SMEM)" ! Data/Mem
The example above downloads data to the corrected memory array. The
data is sent by the program to the analyzer using ASCII encoding. The
data is sent as ASCII characters, separated by commas. The analyzer
accepts the comma separated list of numbers until it receives a linefeed
to terminate the command. The program uses semicolons at the end of
some OUTPUT statements to avoid sending a linefeed until all of the
data has been sent. After the last number is sent, the program sends a
linefeed, and the analyzer accepts the data.
Remember, for faster transfers, use binary data encoding instead of
ASCII.
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