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

[Fabio Eboli]

A "Z" miswritten or misread that becomes a "2" ? :)

Fabio.

Mitch Van Ochten <mitch at vincentelectronics.com> ha scritto:

> 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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>>
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