4: Pulse card concepts Model 4200A-SCS Pulse Card (PGU and PMU)
4-12 4200A-PMU-900-01 Rev. B March 2023
Figure 82: 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.
High-endurance output relay (HEOR): Each output channel of a pulse card has a high-speed,
solid-state output relay. When this relay is closed, the waveform segment is output. When opened,
the channel output is electrically isolated (floating) from the DUT. In the figure in Full arb waveform
(on page 4-15), the output relay is opened during segment seven. This puts the output in a floating
condition. The minimum time for a segment with a HEOR transition (open-to-close or close-to-open)
is 25 µs for the 4220-PGU and 4225-PMU.
Because of the resources necessary to generate the Segment Arb waveforms, an additional 10 ns
interval is added to the end of the last segment of a Segment Arb waveform. During this interval, the
output voltage, HEOR, and trigger output values remain the same as the final value reached in the
last segment.
In the following figure, sequence 1 is an 82-segment sequence; additional rows are not shown in the
figure. Sequence 2 is a 5-segment sequence. There are additional columns to the right for
per-segment measurement configuration.
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