High Speed Data Transfers; Software Help The Wave Form Analysis Library - Agilent Technologies 3458A User Manual

High Speed Data Transfers

Software Help The
Wave Form
Analysis Library
cycle. Two methods suggest themselves for this analysis: (1) sweep the entire
frequency spectrum at 100 ns interval or (2) divide the frequency spectrum into
bands and sweep these bands at the 1/(2f
acquisition time is minimized, in the second case the need for a fast computer is
minimized.
Figure 57. Using the
3458A as a phase/gain
meter with a swept
frequency generator
for magnitude only
Bode plots. The DUT
can be characterized
over frequency with a
phase synchronous
trigger to time the
measurement.
The 3458A can transfer readings at its maximum reading rate to a 9000 Series
200/300 computer with a direct memory access card only the computer is set up
to capture the data at this rate. The readings can be taken from the 3458A internal
memory or as the dmm is making the measurements. Two conditions must occur:
the dmm has to be devoted to high speed readings and the proper buffers must be
set up in the computer.
PRESET DIG is exactly the command needed for the 3458A. It sets up the DMM
for the highest speed possible.
As long as direct digitizing is the desired operation, there is no problem in
reconstructing the wave form as it is presented to the computer. If you use the
memory for data storage before transferring the captured signal, the 3458A orders
the data for you.
The Wave Form Analysis Library, 3458A Option 005 (03458- 80005), not only
lets you acquire the wave form without having to use even the simple commands
to control the 3458A, but it also lets you analyze and present the data with a
minimum of computer and instrument knowledge. A simple sequence of
measurement setup, measurement acquisition, analysis, and presentation is all that
you have to keep in mind while developing your master program that calls up both
BASIC language and compiled subprograms. Refer to Figure 58.
Appendix E High Resolution Digitizing With the 3458A
) for the band. In the first case, the data
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