Automatic
Automatic lets the oscilloscope select the record length for you. The
oscilloscope picks a record length that optimizes the amount of data acquired
and the display update rate. When the sample rate is set to manual and the
record length is set to automatic, the oscilloscope selects the shortest record
length that allows all the data in the waveform record to fill the screen (to a
lower limit of 256 points for a single-wide plug-in and 512 points for a
two-wide plug-in, and to an upper limit of the maximum record length).
When the oscilloscope is in the color graded display, waveform histogram, or
mask testing modes, an optimum number of points for the database is
selected. It is recommended that the auto record length be used for the
above three modes.
Manual
Manual lets you pick a record length from 16 to 16K points with single-wide
plug-ins in the A model mainframes, from 16 to 65K points in the D model
mainframes. (up to 32K or 128K points with a two-wide plug-in, like the
HP 54721A; or up to 64K or 256K points with a four-wide plug-in, like the
HP 54722A). Use the knob, arrow keys, or keypad to select a record length.
Remember that sample rate and record length work together. If you combine
a small record length with a high sample rate, you will have a very fast
throughput, but very little data in the record.
Acquisition Menu
Record Length
3–15
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