DEC AXV11-C analog board
Douglas Taylor
dj.taylor4 at comcast.net
Tue Feb 8 16:35:41 CST 2022
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.
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