Extract from post #51, dated Feb. 29,
q.v. . . .
I purchased one of these:
Quote:
Originally Posted by David G4EBT
There are several e-bay offerings at £10 - £15 post free from China of the ‘KKMOON High Precision Voltage Reference Module AD584kH’ with selectable outputs of 2.5, 5, 7.5 and 10V.
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Which, upon initial test, also proved to be defective. O/P voltages wrong - very wrong. At present, this matter is unresolved.
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Update, March 4. 2016.
Fortunately, that matter
is now resolved, but not without a struggle with the supplier. I eventually received a refund.
So that's now two precision voltage reference units - from different suppliers - that I have here, both faulty. One is simply a pcb with an AD584 plus a few passive components; the other also has several SMT devices on its pcb, in addition to the AD584. Now on the basis that there
may a reasonable chance that only
one AD584 chip is defective and since I have the datasheet for the AD584, in the established time-honoured tradition, I
might be able to make a good one out of the two. After all, what have got to lose? A few hours of my time at worst.
I'll report back later.
Al.