To create a contiguous waterfall or spectrogram display
Contiguous traces are needed when you use a waterfall or spectrogram
display to generate an arbitrary-source waveform. You use waterfall or
spectrogram displays to generate arbitrary waveforms that contain more
than 4096 samples of complex data or 8192 samples of real data.
1. Prepare time-capture RAM for your signal:
Press [
Instrument Mode], [capture setup
]
.
Check [
buffer length] to verify that your signal will fit in time-capture RAM.
Increase [
buffer length] if necessary.
2. Fill time-capture RAM with your signal:
Press [
fill buffer].
3. Set the overlap to 0%.
Press [
Time], [ovlp: avg off 0%].
4. Select time-domain data.
Press [
Measurement Data], [main time].
5. Select a waterfall or spectrogram display and set the buffer depth to 20.
Press [
Display], [waterfall setup], [waterfall on].
Press [
buffer depth 20].
6. Start the measurement:
Press [
Meas Restart
].
Storing your signal in time-capture RAM and playing it back with 0%
overlap ensures that the traces in a waterfall or spectrogram display are
contiguous. To use waterfall or spectrogram data to drive the arbitrary
source, you need contiguous traces to eliminate phase discontinuities in the
arbitrary-source waveform. Make sure to display your data in the time
domain since the arbitrary source requires time-domain data.
This procedure uses a buffer depth of 20 to accommodate all procedures in
this chapter. Be sure to set the buffer depth according to your
measurement needs.
Creating Arbitrary Waveforms
6-10
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