Segment Arb waveform
Each channel of a pulse card can be configured to output its own unique Segment Arb
®
waveform. A
Segment Arb waveform is composed of user-defined line segments, up to 2048 for the 4220-PGU
and 4225-PMU. Each segment can have a unique time interval, start value, stop value, output trigger
level (TTL high or low) and output relay state (open or closed).
If both channels of a pulse card are being used, the segment trigger levels for Channel 1 will be seen
at the TRIGGER OUT connector. The trigger levels for Channel 2 are ignored.
A Segment Arb waveform consists of line segments illustrated in the figure below. The blue line
represents the voltage waveform; the red represents the measure windows. This figure contains a
12-segment waveform.
Figure 83: Example of waveform measured using seg_arb_sequence
Two types of measurements are supported: spot mean and sample. Spot mean measurements take a
mean of all the samples within the measured window and result in a single reading for that segment.
The sample measurement reports all of the samples within the measurement window, which can then
be plotted versus time to provide a waveform.
Note that Segment Arb provides the capability to include measurement (for the 4225-PMU) and
sequences (4225-PMU and 4220-PGU).
Pulse Mode: Sequence, Segment Arb
LPT Functions: seg_arb_sequence and seg_arb_waveform
These more advanced functions can be used by the 4220-PGUs and 4225-PMUs to define a
Segment Arb waveform.
If both channels of a pulse card are being used, the segment trigger levels for CHANNEL 1 will be
seen at the TRIGGER OUT connector. The trigger levels for CHANNEL 2 are ignored.
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