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" <[email protected]>
To: <[email protected]>
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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