I have access to a metrology lab with a Fluke 5522A, and a 8508A.
Any hints regarding what should be checked (more thoroughly)?

Regards,
Gabi

On 1/19/2015 10:57 PM, Laurence Motteram wrote:

I have not seen inside a 1281, but my 4920 has a 3V battery for the cal
constants. I am guessing that the unit would have flagged error codes
2110-2113.

Looking at the specs, it looks like the meter uses the 1V and 100mV ranges
for measuring resistance based on the selected range and whether or not it
is in LoI mode. The error messages appear that it is a gross measurement
error of over 100mV on both flagged ranges. I would think the 5522A would
be good enough for a quick sanity check of all possible inputs.

Todd

On Tue, Jan 20, 2015 at 4:09 AM, MailLists lists@medesign.ro wrote:

I would just check that all of the DCV ranges were reasonably accurate (<50ppm???) and were linear at e.g. 0V, +/- 0.5V, 1V, 1.5V, 1.9V.

Best Regards,

Laurence Motteram

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Sent: Tuesday, 20 January 2015 8:09 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Datron 1281

I have access to a metrology lab with a Fluke 5522A, and a 8508A.
Any hints regarding what should be checked (more thoroughly)?

Regards,
Gabi

On 1/19/2015 10:57 PM, Laurence Motteram wrote:

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Actually it's a 3.6V (SL-750/T) one. It still has ~3.68V, and no NVRAM
checksum errors are reported.

It's a no opts unit (only DCV), so the errors are not related to
resistance measurement.
As Hubert (Dankeschön) pointed out, it's related to the int cal src
drifting outside certain ranges.
As Laurence (thank you) observed, it probably would be fixed with the
int src cal characterization after ext cal, if nothing is physically wrong.

The manual specifies:
N.B.
Full Selftest cannot be selected unless a successful
'Internal Source Calibration' has been carried out
since the most-recent External Calibration.
Caution
The success of Full Selftest can be inhibited by:
• temperature not in the range: 13°C to 33°C;
• more than 1 year since Internal Source
Calibration executed;
• temperature more than 10degC different from
Internal Source Calibration; or
• presence of excessive RFI or Line noise.

2273 1V Range - Attenuated +10V Ref Magnitude Drift
Digital comparison of the present magnitude against that
recorded at the most-recent Internal Source Cal.
+100mV Signal Mag. Drift  1-10ppm < drift < 1+10ppm

2283 100mV Range - Attenuated +10V Ref Magnitude Drift
Digital comparison of the present magnitude against that
recorded at the most-recent Internal Source Cal.
+100mV Signal Mag. Drift  1-20ppm < drift < 1+20ppm

How would that drift be determined, without an ext cal?

Regards,
Gabi

On 1/20/2015 5:42 PM, Todd Micallef wrote:

Thank you, it will be moved promptly!

Didier KO4BB

On Tue, Mar 10, 2015 at 1:16 AM, Михаил timka2k@yandex.ru wrote: