[time-nuts] HP53131A Measurement Throughput (was: HP53131A RS232 question)

[Scott Stobbe]

Attached are a few plots of bits right on the RS232 line, for various gate
times.

First plot, "HP53131A_BAUD.png" serial transmit duration ~10.4 ms for 20
characters, plus one start and one stop bit yields a baud rate of 19.2
kBaud, as expected.

The next plot, "HP53131A_1sTrigDelay_1sGate.png" is just as wonderful as
the many NEMA serial debates, the mean period is ~1150 ms, with +-50 ms of
jitter.

The next plot,  "HP53131A_100msGate.png" shows the measurement rate is no
where near 10 Sa/s, but is approximately 4 Sa/s. The serial transmit
duration is only ~10ms so its not being bandwidth limited on the UART.
Again roughly +- 50 ms of jitter.

Finally plot, "HP53131A_10msGate.png" the measurement rate is only 6.25
Sa/s for a 10 ms gate time. The jitters is slightly better at +- 25 ms.

For time interval measurements the 53131 keeps up to about 17 events/s
before it starts dropping samples.

When I pick up a long enough GPIB cable I will see how much better the
results are over GPIB versus RS232.
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