Download Tektronix scope programmer`s manual

Waveform commands also work with extended-acquisition-length mode. This mode lets the
oscilloscope acquire extended acquisition lengths of 2M, 4M, and 8M while maintaining waveform
record lengths limited to 500K.
In other words, the acquisition data for a channel may be bigger than a waveform you view. Then,
after the data is acquired, you can move to and display any portion of the data.
This mode lets you select a subsection of the larger acquisition data. You can select the starting
and ending positions in the acquisition data and the waveform record.
NOTE: To function properly, extended acquisition mode forces some oscilloscope modes and
settings to new values. Also, measurements, gating, and cursors are restricted to the current
waveform record.
Table 2-24 below shows the correlation between the number of channels in use and the waveform
record lengths.
Table 2-24: Table of Extended-Acquisition-Length Mode Channels and Record Lengths
=============================================
Waveform
# of Channels in Use
Extended
Record Length
Acquisition
Length
------------------------------------------------------------------------------8 M samples
500 K samples
1 of 4
(not on the TDS 520D
and TDS 724D)
------------------------------------------------------------------------------2 of 4
4 M samples
250 K samples
(or on the TDS 520D
and TDS 724D:
1 of 2)
------------------------------------------------------------------------------3 or 4 of 4
2 M samples
100 K samples
(or on the TDS 520D
and TDS 724D:
2 of 2)
From a software development viewpoint, to define how much of the extended acquisition length
data to include, you can use the DATa:STARt and DATa:STOP commands.
To define the waveform record within the extended acquisition data, you can use the
HORizontal:RECORDSTART or HORizontal:POSition command.
The CURVe? query will return the extended acquisition data as you defined it with DATa:STARt
and DATa:STOP. With extended-acquisition-mode set to on, this can be much larger than the
waveform record. With extended-acquisition-mode set to off, this is equal to the waveform record.
Commands related to extended-acquisition-length mode operations include:
CURVe, DATa RECORDSHAp, DATa SOUrce, DATa:STARt, DATa:STOP,
HORizontal:ACQDURATION?, HORizontal:ACQLENGTH, HORizontal:EXTDACQ,
HORizontal:POSition, HORizontal:RECORDSTART, RECAll:ACQDATA, SAVe:ACQDATA, and
WFMPre:<wfm?>.
NOTE: Extended-acquisition-length mode CURVe? queries can easily return more data than will
fit on a 1.44 Mbyte floppy. For example, to return an entire 8 M extended acquisition mode record
63