Stanford Research Systems SR780, Руководство по эксплуатации и программированию, Страница: 245 / 497

Arbitrary Source Menu 4-63
SR780 Network Signal Analyzer
When the Arbitrary source is a Capture buffer, the Play Rate defaults to the capture
Sampling Rate. The Play Rate should be equal to the capture Sampling Rate to preserve
the frequency content of the buffer.
When the Arbitrary source is the Arbitrary waveform memory, the Play Rate should be
set according to the rate used to calculate the waveform samples.
When the Arbitrary source is copied from a time record trace, the Play Rate should be set
to the sampling rate at which the time record was acquired.
Caution
In both cases, if the Play Rate is LESS than the maximum sampling rate, the output will
contain alias frequency components above 1/2 the sampling rate. In general, the
frequency span of any measurement using this source should not exceed 1/2 times the
Play Rate to avoid measuring these alias frequencies.
Command: ARAT (?) {i}
Source
Select Arbitrary waveform playback from the Arbitrary Waveform memory or from a
Capture buffer. Use the <Memory Allocation> menu to allocate memory between the
capture buffer, waterfall storage and the arbitrary source waveform.
The Arbitrary waveform memory can be loaded from a stored trace, via the computer
interfaces or from a disk file. The Capture buffer is filled by capturing an input signal.
Command: ASRC (?) {i}
More
Display the Arbitrary Source Settings menu. Press <Return> for the main [Source] menu.