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E1437A
ASCII Overview and Commands
FILTER:SETUP
Sets the digital filter bandwidth and decimation filter parameters. This
description also includes information on the following commands which set
or query the decimation filter parameters individually:
FILTER:DECIMATE selects an extra factor of 2 decimation.
FILTER:DECIMATE? gets current state of extra decimation
FILTER:BW selects a signal filter bandwidth.
FILTER:BW? gets the signal filter bandwidth
Command Syntax:
FILTER:SETUP <sigBw>,<decimate>
sigBbw::=<numeric>
decimate::=01
FILTER:BW <numeric>
<numeric>::=0 to 24
FILTER:DECIMATE::=01
Query Syntax:
FILTER:BW?
FILTER:DECIMATE?
Example Statements:
OUTPUT 70924;"FILTER:SETUP 12,0"
OUTPUT 70924;"FILTER:BW?"
ENTER 70924;Response$
Parameter Definitions:
2^(sigBw)) where fs is the ADC sample frequency. In zoom applications, where the
center frequency is generally not zero, the zoom filter bandwidth is centered on the
frequency programmed with the frequency:setup command. For baseband
measurements the filter may equivalently be considered as a low pass filter of
approximately bandwidth fs/(2.56 * 2^(sigBw)) since the negative frequencies are
generally of no interest.The valid range of sigBw is 0 through 24. When sigBw = 0,
no digital filtering is applied to the signal and the module relies on the analog
anti-alias filter to limit the signal bandwidth to fs/2.56.
To more accurately calculate the bandwidth use the calculation ±fs * k/2^(sigBw)
where:
k=.36 for .25 dB bandwidth
k=.44 for 3 dB bandwidth
k=.5 for 15 dB bandwidth
k=.62 for 110 dB bandwidth
5-20
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numeric::=0 to 24
selects an alias protected signal filter bandwidth that is roughly ±fs/(2.56 *
FILTER:SETUP
command/query
command/query
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