On 2/8/22 16:35, Douglas Taylor via cctalk wrote:
On 2/8/2022 5:22 PM, Jon Elson via cctalk wrote:
On 2/8/22 13:34, Douglas Taylor via cctalk wrote:
Update on this: I did put together a battery and
voltage divider to test the AXV11. The label on the A/D
module says it brings the output from the multiplexer to
one of the external pins. I was able to verify that the
voltage applied to a couple of the A/D inputs makes it
through the multiplexer when selected using the CSR.
The next output available is from the Sample and Hold,
and this is always pegged at +12v. Am I wrong to assume
that the sample and hold will 'freeze' its output when
the A/D go bit is set?
Well, it will probably only hold the approximate voltage
for a few seconds, but should be long enough to see on a
voltmeter.
Jon
I was only using a voltmeter to look at it.
I'm going to try 2 different measurements; (1) use a scope
to look at the S&H signal on the AXV11 and see what it
does over time, (2) look at the same S&H signal on the
Data Translation board which seems to be working.
The S&H will likely have a FET as the switch element, and
those might be fairly easily damaged by external pulses. I
opened up some comparable Xincom modules and made minor repairs.
Jon
