Electronics > Metrology

ADR1399 reference

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Andreas:

Hello,

update of ADR1399LS8 on PCB#1 ageing 5kHr after putting into Hammond enclosure and with temperature compensation:
see also
https://www.eevblog.com/forum/metrology/adr1399-reference/msg5011936/#msg5011936



The ADR have now 8.3 kHrs in total operating time. Tempco is calculated out for the ageing curves.
The ADR1399LS8#01 - #03 are drifting slightly upwards ~2-3.5 ppm / 5 kHr in average over the last 5 kHrs.
(now drifting in different directions).

The ADR1399LS8#04 has nearly no (~1.2 ppm) ageing drift.

with best regards

Andreas

Andreas:
Hello,

update from the 2nd ADR1399 PCB now at 2 kHrs for the metal can devices (KHZ) and 2.1 kHrs for the LS8 devices (first 100 hours not shown):

See also
https://www.eevblog.com/forum/metrology/adr1399-reference/msg5068999/#msg5068999

The values are all temperature compensated (temperature sensor at the bottom of the hammond die cast housing)

with best regards

Andreas

branadic:
That is some interesting result Andreas. While the ADR1399KHZ seems to drift upwards (similar to what I observe for the Valhalla 2720GS/HSR-ADR and my ADR1399-PWM-DAC) all LS8 devices seem to follow the picture we can see in the datasheet.
This seems to indicate, that Figure 27 was achieved using LS8 devices, not TO-46.

-branadic-

Andreas:
Hello branadic,

I have 2 PCBs with 4 LS8 devices each.
On PCB#1 all ageing drift is rising (datecode #2043)
here the drift is rising.
https://www.eevblog.com/forum/metrology/adr1399-reference/msg5077309/#msg5077309
https://www.eevblog.com/forum/metrology/adr1399-reference/msg4308397/#msg4308397


On PCB#2 (see post above) I bought the devices much later
There I have falling drift for the LS8 devices. (unfortunately I did not write up the date code).

The metal can devices have date code #2316

I fear the direction of the drift is more related to the date code.

with best regards

Andreas


Andreas:
Hello,

update of ADR1399LS8 on PCB#1 ageing 6kHr after putting into Hammond die cast enclosure and with temperature compensation (sensor on bottom of the hammond case)
see also
https://www.eevblog.com/forum/metrology/adr1399-reference/msg5077309/#msg5077309


The ADR1399LS8 have now 9.3 kHrs in total operating time. Tempco is calculated out for the ageing curves.
These LS8-devices are drifting upwards.

The voltage shift at the 2 LM399 (only for comparison) occurred after repair on the output connector. (while operating the cirquit).
Most probably I have damaged the Multiplexer for the "upper half" of the PCB during soldering.
(will have to check that when I have some time).

with best regards

Andreas

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