[volt-nuts] Resistance Standard Oil - Plain Mineral Oil?

[J. L. Trantham]

I wondered about the oil in the other two.  They come from very different
sources and one was NOS, including the calibration certificate, original box
and packing, etc., and both seem to have the same oil although one is GRAY
Industries and the other is Leeds & Northrup.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Mitch Van Ochten
Sent: Friday, November 25, 2011 9:37 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] Resistance Standard Oil - Plain Mineral Oil?


Hi Joe,

I just ordered it today. Might have been foolish to spend so much on mineral

oil.
ESI recommended "Drakeol 9 LT mineral oil" in their literature but I 
couldn't find it in small quantities.
I investigated a synthetic oil replacement called SpectraSyn PAO and Exxon 
offered to send a sample.
After checking with a chemist at work I decided not to.
He said over many years of immersion the "long chain parrafin" would be the 
best, and
less likely to deteriorate the insulation than a synthetic replacement.

I suspect someone may have substituted motor oil in your other resistor.


Regards,

mitch


----- Original Message ----- 
From: "J. L. Trantham" <jltran at att.net>
To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
Sent: Friday, November 25, 2011 9:32 PM
Subject: Re: [volt-nuts] Resistance Standard Oil - Plain Mineral Oil?


> Thanks for everyone's reply.  If all it takes is just plain old 
> Mineral
> Oil,
> I can get that easily at the local grocery or drug store.
>
> Mitch, have you received the Drakeol yet?
>
> I also have a Leeds & Northrup 0.1 ohm and a GRAY Inst. Co. 10000 ohm 
> Standard Resistor, both of which came with oil.  Their oil, though, is 
> very dark with quite the odor.  Somehow, I don't think plain old 
> Mineral Oil is quite the same.  If it is an acceptable substitute, I 
> can certainly get it very easily.
>
> I had always thought the oil was as much for elimination of moisture 
> as it was for insulation.  Also, of course, it seems to be for the 
> purpose of adding some 'thermal mass'.
>
> Joe
>
> -----Original Message-----
> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] 
> On Behalf Of Mitch Van Ochten
> Sent: Friday, November 25, 2011 7:43 PM
> To: Discussion of precise voltage measurement
> Subject: Re: [volt-nuts] Resistance Standard Oil - Plain Mineral Oil?
>
> Joe,
>
> I just ordered some Drakeol 7 from this company:
>
> http://www.cqconcepts.com/chem_mineraloillight.php
>
> It's $12.23 per quart and they take PayPal.
>
>
> Regards,
>
> mitch
>
> ----- Original Message -----
> From: "J. L. Trantham" <jltran at att.net>
> To: "'Discussion of precise voltage measurement'" <volt-nuts at febo.com>
> Sent: Friday, November 25, 2011 1:17 PM
> Subject: [volt-nuts] Resistance Standard Oil - Plain Mineral Oil?
>
>
>>I have looked back over the archives about this and have found some  
>>information but I am not really clear on whether or not local grocery 
>>or  drug store mineral oil is acceptable for my Leeds & Northrup 10 
>>ohm  standard  resistor.
>>
>>
>>
>> I emailed Ohm-Labs (that I think maybe acquired Leeds & Northrup?) 
>> and they suggested Drakeol 7 or Blandol.  However, I can't find a 
>> source for it. They suggested Fisher Scientific or VWR but I can't 
>> find either brand listed
>> on their websites.  They do list 'light mineral oil'.
>>
>>
>>
>> Any information or suggestions appreciated.
>>
>>
>>
>> Joe
>>
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