[volt-nuts] Bls: “A Solid-State Reference System”. Author: John R. Pickering

[Anton Moehammad via volt-nuts]

Hi Frank, 

I also interested with the paper and paper from spreadbury and deaver if You 
don't mind 

Thank You




yes I have this paper, size is too big, so I'll forward it to you directly.

The patent to this 7000 standard is UK patent GB 258 356A, about 
removing of hysteresis of the LTZ.

Actually, it should not function in the 7000 standards, as these run on 
45°C, and therefore the temperature swing is too low, and there is 
usually no hysteresis at this low temperature.

I also have several interesting papers from Spreadbury and Deaver, about 
stabilities / drift behaviour of LTZ1000 and LTFLU. 


 Pada Jumat, 13 November 2015 2:09, Frank Stellmach 
 menulis:
   

 Hello Alan,

yes I have this paper, size is too big, so I'll forward it to you directly.

The patent to this 7000 standard is UK patent GB 258 356A, about 
removing of hysteresis of the LTZ.

Actually, it should not function in the 7000 standards, as these run on 
45°C, and therefore the temperature swing is too low, and there is 
usually no hysteresis at this low temperature.

I also have several interesting papers from Spreadbury and Deaver, about 
stabilities / drift behaviour of LTZ1000 and LTFLU.

regards Frank



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[volt-nuts] nA advice

[Andrea Baldoni]

Hello!

I would like to measure insulation resistance of some defective load cells.
The measurement should be done with no more than 50V and the full scale
reading should be >=5Gohm. Accuracy of +-10% is enough (in fact it could
suffice just to check if it's >=5Gohm or not).

I have not been able to find a ready made instrument that could do this within
a reasonable price (100 EUR); the normal insulation resistance testers go much
high with the probing voltage (on the purpose, but this also lighten much the
requirements on the sensitivity of the meter).

It could be as simple as a led indicator "pass/fail", but at this point, why
not to build a good frontend for a multimeter, so it could be much more useful?

There are many way to do this and also many ready circuits (like the
null detector in the mini metrology lab by Conrad Hoffmann) or in the AoE,
but instead of making it from scratch, someone knows if there is something
already made (or a kit)?

Best regards
Andrea Baldoni
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Re: [volt-nuts] nA advice

[Rob Klein]

50V across 5GOhm is 10nA. Put a standard multimeter's 10MOhm input in 
series and

you have 10mV per nA reading. Anything below 100mV is pass.


My 2 eurocents.

Rob Klein

Op 13-11-2015 om 17:15 schreef Andrea Baldoni:

Hello!

I would like to measure insulation resistance of some defective load cells.
The measurement should be done with no more than 50V and the full scale
reading should be >=5Gohm. Accuracy of +-10% is enough (in fact it could
suffice just to check if it's >=5Gohm or not).

I have not been able to find a ready made instrument that could do this within
a reasonable price (100 EUR); the normal insulation resistance testers go much
high with the probing voltage (on the purpose, but this also lighten much the
requirements on the sensitivity of the meter).

It could be as simple as a led indicator "pass/fail", but at this point, why
not to build a good frontend for a multimeter, so it could be much more useful?

There are many way to do this and also many ready circuits (like the
null detector in the mini metrology lab by Conrad Hoffmann) or in the AoE,
but instead of making it from scratch, someone knows if there is something
already made (or a kit)?

Best regards
Andrea Baldoni
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Re: [volt-nuts] nA advice

[Charles Steinmetz]

Rob wrote:

50V across 5GOhm is 10nA. Put a standard multimeter's 10MOhm input 
in series and

you have 10mV per nA reading. Anything below 100mV is pass.


Also, quite a few of the Fluke portable and handheld DMMs from the 
last 35 years or so (including the faithful old 8050A and the 
"80-series" DMMs) measure conductance (1/R) with a resolution down to 
0.01nS (= 100G ohm).  There are lots of them with this capability on 
the used market for $10 and up, and several are still available new 
(but not for less than Eu100, to my knowledge).


Best regards,

Charles


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