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

Andreas Jahn Andreas_-_Jahn at t-online.de
Sun May 27 08:57:51 UTC 2012


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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