[time-nuts] Volt-nuts cooperation?

[Francesco Ledda]

Lucky me, I bought an HP3455A new still in the box for $300!

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com]On
Behalf Of Mark Sims
Sent: Saturday, June 20, 2009 5:05 PM
To: time-nuts at febo.com
Subject: [time-nuts] Volt-nuts cooperation?



The 3458A has two types of calibrations.  The first is done every year or
two using the external references.  The other is an internal self
calibration which you should run every day or two.  This is pretty much
standard for every high res meter on the market today (except most want you
to send it to the external cal lab every six months)

The 3458A is probably the best meter on the market.  It seems like
multimeters pretty much stopped evolving with this unit.  Basically 8.5
digits seems to be the practical limit of resolution that you can extract
from silicon devices.  8.5 digit meters have been available for around over
20 years now.  Nobody seems to have come out with anything better in the
last 20+ years.

As far as spending $4-5K for a 3458A,  if you are patient and a little lucky
you can score one for half that.  I bought one for under $1500 (but sold it
after I was made an offer I could not refuse).  My latest one cost $2500.
There is one on Ebay right now that opens at $1600.  I suspect it will sell
for under $2800.


----------------------------------------
I am a little confused as to your needs.  On the one hand you feel the
hp3458A is
a fine instrument only needing “CAL” every 2 years, yet you then say it
needed to
be “CAL’d” every 2 days to stay repeatable.  That does not sound very
encouraging
and is indicative of other problems.


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