Hello,
the drift in sync is something that I have with humidity changes and
plastic housings.
And they also have temperature changes of +/-4 deg C in the setup.
But usually the temperature gradient is different with different samples
near room temperature.
The influence may also be due to PCB stress.
with best regards
Andreas
Am 15.09.2014 um 19:35 schrieb M K:
On 15/09/2014 17:57, Tony wrote:
On 14/09/2014 18:29, Andreas Jahn wrote:
By the way:
By accident I have found some ageing drift data of REF5050 on
Malone's homepage:
http://www.voltagestandard.com/Tech_Data.html
For me it looks around 120 ppm drift within the first year.
Unfortunately there is no humidity data with the plot.
With best regards
Andreas
That's a very interesting find Andreas, thanks. After approx 500
hours, maximum drift is approx 80ppm, but its impossible to deduce
how much of that is due to long term drift, temperature and humidity
changes.
The long term drift specification for the REF5050A tested is 125ppm
(0-1000 hours), 45ppm (1000 to 2000 hours). Those for the automotive
qualified REF5050-Q1 part are 100ppm and 10ppm respectively - way
better after the initial 1k hours.
Regards,
Tony H
One thing that concerns me is that all 5 units seem to drift in sync,
so how much of that is the DVM doing the measuring? or is it just a
single batch with the same date code?
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