[volt-nuts] keithley 2015 (2000) voltage reference SL40057

[Mitch Van Ochten]

The Keithley 2002 Service Manual says it uses a "IC, ULTRA PRECISION REF, 
LT21000A (PKG H8)".


Regards,

Mitch


----- Original Message ----- 
From: "Andreas Jahn" <Andreas_-_Jahn at t-online.de>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Sunday, May 27, 2012 4:57 AM
Subject: Re: [volt-nuts] keithley 2015 (2000) voltage reference SL40057


> Hello Fabio,
>
> since National does not longer produce the LM399, LT is the only 
> manufacturer where you can get them.
> In a german forum they state that the SL40057 IC-527 is used at least in a 
> keithley 2000 (6,5 Digit).
>
> From my collected information of DMMs I know the following:
> Keithley 2000, 2001 and 2010 use the LM399
> Keithley 2002 uses the LTZ1000A
>
> with best regards
>
> Andreas
>
> ----- Original Message ----- 
> From: "Fabio Eboli" <fabioeb at quipo.it>
> To: <volt-nuts at febo.com>
> Sent: Sunday, May 27, 2012 9:50 AM
> Subject: [volt-nuts] keithley 2015 (2000) voltage reference SL40057
>
>
>> Hello, I opened a keithley 2015, it contains a voltage reference
>> that resembles an LMx99, but is marked Linear Technology
>> and reports thes codes SL40057 IC-527 0430 the last seem a datecode.
>> here a pic:
>> http://www.flickr.com/photos/14336723@N08/7277911474/
>> I measured +6,99... volts on the pin 1 vs pin 2.
>>
>> Anyone has more info?
>>
>> Does the 2001/2002 use the same reference?
>>
>> Also I was warned to change the psu electrolytics, seem they
>> are prone to failure.
>>
>> Fabio.
>>
>> ----------------------------------------------------------------
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>>
>>
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