Saving and Recalling Waveforms
3–108
TDS 420A, TDS 430A, TDS 460A & TDS 510A User Manual
DAT file data is read line by line and placed into variables in the MathCad
document. You then do whatever calculations are required. The DAT format
begins with four values acting as a header containing the record length, time
per sample interval, trigger location, and trigger offset, followed by a linear
array of ASCII floating-point Y values. The recordLength, pre–trigger
sample count, and trigger offset are in samples. The horizontal scale per
sample is in x units and the y value is in y units.
Spreadsheet creates files (.CSV) in a format usable by most spreadsheets
(Excel
, Lotus 1-2-3
, and Quattro Pro
).
CSV files (Comma Separated Values) contain comma separated X and Y
ASCII values on CRLF terminated lines (a 2 dimensional array). Each value
is a floating point number. There is one line for each point in a waveform
record. The X and Y values are displayed in the units of seconds and Volts.
All scaling to sample increments and offsetting has been done. Zero on the X
scale is the trigger point, with negative values being pretrigger and positive
values being posttrigger.
Figure 3–58: Save Format Menu
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