3 IQ Analyzer (Basic) Mode
3.4 Fast (Deep) Capture
NOTE
When the word size is 32-bit, points can only be retrieved on even sample
number boundaries. That is, the pointer and block length must be even numbers.
Therefore, when the word size is set to AUTO, it is recommended that the pointer
and block size be only set to even numbers.
3.4.1 Fast Capture Length
Sets the length of the SCPI Fast Capture in samples (points). This is constrained to
be an even number.
The query returns the most recent length setting.
Remote
Command
[:SENSe]:FCAPture:LENGth <integer>
[:SENSe]:FCAPture:LENGth?
Example
:FCAP:LENG 1000
:FCAP:LENG?
Notes Affected by the IF path currently used, which can in turn be affected by the span. It is also affected by
the internal Fast Capture Word Length. The current maximum fast capture length can be found by using
the query:
:FCAP:LENG? MAX
Changing the Capture Length after initiating a fast capture clears the capture memory in preparation for
a new fast capture of a different length
Preset 1048576 Samples
Min 2
Max When Fast Capture Word Length is BIT64:
Option Value
DP2 + B10,B25 268,435,456
B40,B85,B1A,B1X,B1Y,B2X 268,435,456
B5X 536,870,912
DP4 + B85,B1A,B1X,B1Y,B2X 536,870,912
DP4 + B5X 1,073,741,824
When Fast Capture Word Length is BIT32:
Option Value
DP2 + B10,B25 536,870,912
B40,B85,B1A,B1X,B1Y,B2X 536,870,912
B5X 1,073,741,824
DP4 + B85,B1A,B1X,B1Y,B2X 1,073,741,824
DP4 + B5X 2,147,483,648
423 IQ Analyzer Mode User's &Programmer's Reference
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