Ever wonder why they have FOUR 732b units in a 734?
(smile) You need at least 3 of anything unknown. 4 is better.
On 8/31/2017 12:00 PM, volt-nuts-requ...@febo.com wrote:
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Today's Topics:
1. 732A drift (Alan Ambrose)
2. Re: 732A drift (Andre)
3. Re: 732A drift (m k)
----------------------------------------------------------------------
Message: 1
Date: Wed, 30 Aug 2017 16:33:55 +0000
From: Alan Ambrose <alan.ambr...@anagram.net>
To: "volt-nuts@febo.com" <volt-nuts@febo.com>
Subject: [volt-nuts] 732A drift
Message-ID: <f18848e7-c3d6-4375-9f82-f7c6cea2f...@anagram.net>
Content-Type: text/plain; charset="utf-8"
My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm pa
over a couple of year
Hope you don't mind me jumping on this thread and asking a basic question: is
there any kind of procedure for the 'enthusiast' (say with single 3458A/single
732 and not say 4x732) to measure the drift of a particular 732.
Alan
------------------------------
Message: 2
Date: Thu, 31 Aug 2017 05:15:18 +0000
From: Andre <an...@lanoe.net>
To: Discussion of precise voltage measurement <volt-nuts@febo.com>
Subject: Re: [volt-nuts] 732A drift
Message-ID: <1504156517622.25...@lanoe.net>
Content-Type: text/plain; charset="iso-8859-1"
Hi, first post!
Yeah, I ran into this issue a while back. Fortunately for most applications 10mV
resolution is fine (eg measuring charge state on Li-ion cells) but I did find that old
meters do seem to experience random drift failures of precision resistors and more so
trimpots. Would it be a good idea for someone to do a "732 FAQ" with likely
faults that would cause a particular matrix of symptoms?
Also how do you deal with failures where a precision component has "gone bad" ? Surely
all the calibrations are suspect which is why any sensible engineer always has two references at a
bare minimum and sets up a master/slave or main/backup then maintains a calibration table of each?
so if a drift is seen then the "bad" unit can be dealt with sternly.
I looked into making a 10.0000Vref a while back and had some success with
active feedback via thermal pad: it almost worked but in the end it was cheaper
and simpler to buy one ready made (cough REF02 /cough)
Also relevant, since originally buying my RS IDM65 you can now get I2C
precision CT references which can replace the troublesome parts
with something that does not drift, ever!
-Andre
________________________________________
From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Alan Ambrose
<alan.ambr...@anagram.net>
Sent: 30 August 2017 17:33
To: volt-nuts@febo.com
Subject: [volt-nuts] 732A drift
My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm pa
over a couple of year
Hope you don't mind me jumping on this thread and asking a basic question: is
there any kind of procedure for the 'enthusiast' (say with single 3458A/single
732 and not say 4x732) to measure the drift of a particular 732.
Alan
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------------------------------
Message: 3
Date: Wed, 30 Aug 2017 20:12:46 +0000
From: m k <m1k...@hotmail.com>
To: Discussion of precise voltage measurement <volt-nuts@febo.com>
Subject: Re: [volt-nuts] 732A drift
Message-ID:
<he1pr0301mb2283cfef8b3d344a07baa9fe91...@he1pr0301mb2283.eurprd03.prod.outlook.com>
Content-Type: text/plain; charset="utf-8"
On 30/08/2017 17:33, Alan Ambrose wrote:
My 732A<x-apple-data-detectors://28> e.g. has a drift of only about 0.2ppm pa
over a couple of year
Hope you don't mind me jumping on this thread and asking a basic question: is
there any kind of procedure for the 'enthusiast' (say with single 3458A/single
732 and not say 4x732) to measure the drift of a particular 732.
Alan
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and follow the instructions there.
.
Not really, you have a Voltmeter and a 732b, they drift a little, how do you
know which one is drifting, and by how
much? you cant know unless you have at least one other unit to compare with,
then you can build a matrix of all the
relative drifts and then guess which one is actually the most accurate...
------------------------------
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