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 4-13), 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 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.
Figure 84: Two sequence definitions
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