Re: 2445B "add" illuminated, no trace.


Siggi
 

On Sun, Jan 9, 2022 at 7:36 AM Paul Flinders <paul@flinders.org> wrote:

The Vref pins of the DAC are at about 0.35/0.36V but as this is actually
a current reference I'm not sure that tells us much (except that from
the data sheet I'd expect the reference pins to be closer to 0V).

You don't get much information from this measurement, but as I've pointed
out, measuring the 1.36 & -1.25V references on the A5 board gives you a
pretty direct assessment of the DAC's reference state. If those are good,
then the reference is good, the MPU is running, and the DACs load resistors
are in order.

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