Hi David,
If it is saturated cells then they do not travel well.
M K
From: david.partri...@perdrix.co.uk
To: volt-nuts@febo.com
Date: Fri, 14 Dec 2012 21:59:17 +
Subject: Re: [volt-nuts] Guildline 9154C
Enough to help me decide whether I want to buy one :) (I think it is 4
That makes a good deal of sense.
Regards,
David Partridge
-Original Message-
From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf
Of m k
Sent: 14 December 2012 21:57
To: volt-nuts@febo.com
Subject: Re: [volt-nuts] Guildline 9154C
Hi David,
My take on it is
Actually,
They are unsaturated cells and moving them is not a big deal so long as you do
not bust them by rough handling. They also last a long time (decades) so long
as you don't draw current from them. They are temperature sensitive and thus
the temperature of the reference
measurement
Bill,
That is very clear, thank you. For my purposes, a solid state voltage standard
would seem to be the answer.
I've not the equipment to make use of these at this time, nor to be honest the
time to do that level of tracking.
Regards,
David Partridge
-Original Message-
From:
Both offered by the same vendor who is selling the Guildline standard cell set.
Both solid state voltage references. He's priced the Cropico Electronic
Standard Cell higher than the Tinsley Voltage Standard.
Does anyone have guidance as to their quality and relative merits?
Thanks
Dave
Both DC Voltage standards up to 1000V or so, and also null differential meters.
Also both being sold by the same vendor as the other stuff
Do the assembled mavens have a view as to which is preferable?
Thanks
Dave
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volt-nuts mailing list --
And also what is the difference between a 335A and a 335D?
Thanks again,
Dave
-Original Message-
From: volt-nuts-boun...@febo.com [mailto:volt-nuts-boun...@febo.com] On Behalf
Of David C. Partridge
Sent: 15 December 2012 02:16
To: 'Discussion of precise voltage measurement'
Subject:
Hobbyist.
The eBay bidding on the Fluke 335D is already going up ...
I still own the 335A (though how long for is another question).
Both the above are spares/repair as is the Efratom FRT (no lock).
The vendor also has Fluke 845 and Fluke 887 and scarily also a 540B, but I
can't afford all
David,
I had to go research a bit. The primary difference between the A D is output
accuracy and stability. Roughly a 2 to 1 improvement. Keep in mind we are
talking splitting hairs. Either one would exceed what one would
normally need for a small home lab.
As for the Fluke 845, you
I am not familiar with the HP 740B. It looks like it needs a special
connector for the front panel to get an output or input. If true, I would
score that as a negative.
I have a 335A that had some problems when I got it. Turned out it was just
some dead electrolytic caps that were identifiable
Hi David -- I have and like an 887AB -- I took the ruined batteries out, and
replaced the mechanical chopper amp with an OPA111 BiFet opamp that was very
spendy at the time, but worked really well -- probably an OPA227 would be good
these days. The only liability of the 887 and most of the
David and all -- here is the page for the chopper amp mod:
http://www.friedrich-messtechnik.de/cms/index.php?option=com_contenttask=blogsectionid=3Itemid=3
Dick
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The Cropice only has 1.0 and 1.018etc volt outputs, so only of use as a
transfer from stan dard cells.
From: david.partri...@perdrix.co.uk
To: volt-nuts@febo.com
Date: Sat, 15 Dec 2012 02:02:18 +
Subject: [volt-nuts] Cropico ESC1 versus Tinsley 5646A
Both offered by the same
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