Electronics > Metrology

Lowest drift, lowest noise voltage reference (ADR1000AHZ)

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Andreas:
Hello,

Update on ageing drift on my ADR#01 + ADR#02 after 40 days (~1 kHr) after adjustments.
ADR#01 first firing was in September last year. Mostly all measurements where done at ~50 deg C.
ADR#02 has ~2kHrs of burn in beginning end of November before final adjustments.

Now I am doing weekly measurements relative to my most stable LTZ#4 reference.
#1 drifted ~1.8 ppm/kHr since adjustments
#2 drifted ~1.2 ppm/kHr since burn in + adjustments.
my newest LTZ#9 (non-A) running since 10/2019 is given for comparison

So #2 seems to have a slight advantage in stabilisation. (but this are only 2 different samples so no significant statistics).
But when I compare that with my AD587 references the ageing drift of the ADR is still too high.

https://www.eevblog.com/forum/metrology/ad587lw-10v-precision-travel-standard/msg4147111/#msg4147111

with best regards

Andreas

Andreas:
Hello,

update on burn in of ADR1000A#03 now at 2000 hrs (sqrt(2 kHrs))

Cycling is unchanged 110-130 deg C

After trendline changed to -15.5 ppm/sqrt(khr) from 500-1000 hrs (in blue)
the ageing reverted back to the initial ageing rate of -38 ppm/sqrt(kHr) from 1000-2000 hrs.

I will now check wether noise has changed (after downcycling to 50 deg C average).

with best regards

Andreas

branadic:
I've passed the 7000 h mark, so here's an update. I've rearranged the setup a while ago, removed one of the 2182A and added 34420A instead. The remaining 2182A still monitors the difference between F7000-1 and F7000-2 (green curve), while the 34420A now monitors the difference between ADR1000 and F7000-1 (red curve) and ADR1000 and F70002 (black curve). The magenta curve is the calculated and thus expected difference between ADR1000 and F7000-2. Black (measured data) and magenta (calculated data) curves do match quite well.
While the first plot is a measurement with R6581D monitoring the ADR1000 directly, in the second plot (second measurement each day) the R6581D measures the F7000T (averaged output of the 2x F7000). In plot 2 you can see me messing with the setup at ~2200 h leading to a small jump downwards, that recovers at ~2850 h when I added the 34420A to the setup.
Measurement ongoing.

-branadic-

Andreas:
Hello,

so I still can hope that my ADR1000A will stabilize in some 3-4 kHrs.
At the moment the drift is still  ~1 ppm/month.

with best regards

Andreas

sahko123:
God I cant wait till I get an ADR1001 put it in a cute little box with a UPS system and seal it away for 50 years

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