308 Chapter5
Programming
Data Transfer to Computer
TDF M (M-format): Return Decimal Numbers in Measurement
Units (output only)
The measurement units (M) format transfers trace data as ASCII
integer values in measurement units, which is the internal format used
by the spectrum analyzer. See Figure 5-8 on page 309. The displayed
amplitude of each element falls on one of 601 vertical points (with the
601st equal to the reference level). For example, the peak of the signal
in Figure 5-8 on page 309 is equal to −10 dBm, or one division below
the reference level. This is equal to 540 measurement units (600
measurement units at the reference level, less 60 measurement units
for one division down, equals 540 measurement units). There are also
ten additional points of overrange. Measurement units range from 0 to
610.
A line feed (ASCII code 10) follows data output. The end-or-identify
message (EOI) is sent with a line feed.
The M-format is faster than the P-format, but most applications will
require computer conversion to parameter units. Also, because the
M-format transfers data as ASCII characters, the data can be viewed
directly.
To send trace data to the computer, see Example 5.
E
XAMPLE 5
10 INTEGER A(1:601)
20 OUTPUT 718;"IP;CF 300MHZ;SP 20MHZ;SNGLS;TS;"
30 CALL Get_settings(Fa,Fb,Rl,Rb,Vb,St,Lg,Aunits$)
40 OUTPUT 718;"TDF M;TRA?;"
50 ENTER 718;A(*)
60 PRINT A(*)
70 END
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