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5 - 2 FUNCTION REFERENCE
ACQUISITION LENGTH
Description:
The oscilloscope allows the user to select the acquisition length, or record length
that best suits the needs of the application. The default acquisition length is 512
data points for each trace. It is possible to increase the length of a trace from 512
points up to a maximum 8K points (or 32K points if the memory expansion option
is installed). This results in a trace length of 16 screens, or 160 divisions.
The TB MODE menu offers four choices to select the acquisition length. This
menu is accessed via the key sequence ’TB MODE >> ACQ LENGTH >> ..’
Selection of the desired acquisition length is then made with the soft keys as
indicated. Note that all registers will be cleared when the length is changed. The
user must confirm the change of the acquisition length.
The X POS control is used to move the trace in horizontal direction and to display
any desired part. A bar graph shows which part of the trace is displayed on the
screen. By using the MAGNIFY key pair, you can expand the trace up to 32 times
to look at signal details. The MAGNIFY keys can also be used to compress the
signal to fit the display width and look at the total waveform. This is realized
without the loss of vertical information.
The 8K acquisition memory is shared between all channels. In the ’2ch@4K pts’
mode the entire memory is used for the two channels, so triggerview of the
external trigger channel is not possible.
In the standard mode the trace length is 512 samples and all channels can be
acquired simultaneously. In this mode, more traces can be stored in the reference
memory, and the screen update rate increases. This mode also supports delayed
timebase operation. This way, acquisition can consist of up to eight traces, four Main
TB and four Delayed TB traces ( for the 2 channel models: six traces, two Main TB
traces, two Delayed Time Base traces and two Trigger View (MTB+DTB) traces).
The following table shows the selection possibilities for a standard oscilloscope
with 8K acquisition memory.
*
) memory plus acquisition; 2 ch. models between brackets
Acquisition length Reference memory Traces
*
)
8K 2 registers of 1 trace each 3 (3)
4K 2 registers of 2 traces each 6 (6)
2K 2 registers of 4 (3) traces each 12 (9)
512 8 registers of 4 (3) traces each 40 (30)