[Boatanchors] DC Voltmeter Calibrator $18

Bill Cotter n4lg at qx.net
Wed Jan 20 07:18:22 EST 2016 

Here is a great little AD584K reference supply for $18 that I 
bought for calibrating my test gear.

http://www.ebay.com/itm/KKMOON-Accuracy-Voltage-Reference-Module-AD584kH-4-Channel-2-5V-7-5V-5V-10-NEW-/131566638421?hash=item1ea1fb9555:g:0RkAAOSwPcVVuH3w

73 Bill N4LG


At 02:26 PM 1/19/2016, W2HX wrote:
>There are a thousand little modules on ebay built around the 
>analog devices AD584 voltage reference
>
>http://www.analog.com/media/en/technical-documentation/data-sheets/AD584.pdf
>
>search ebay for them.  These can be excellent references for your lab.
>Eugene
>
>
>
>-----Original Message-----
>From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On 
>Behalf Of Jacques Fortin
>Sent: Tuesday, January 19, 2016 2:19 PM
>To: 'David C. Hallam'; 'Al Klase'; boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] DC Voltmeter Calibration
>
>Hi David,
>
>My 2 cents is: reading 1.651V from fresh Alkaline cells is very 
>much plausible and this not indicates any DMM calibration problem.
>I read 1.62 - 1.65 V from a couple of Duracell Quantums with my 
>trusty HP34401A DMM here (.01% accuracy, minimum).
>
>Jacques
>VE2JFE
>
>-----Original Message-----
>From: Boatanchors [mailto:boatanchors-bounces at mailman.qth.net] On 
>Behalf Of David C. Hallam
>Sent: Tuesday, January 19, 2016 1:52 PM
>To: Al Klase; boatanchors at mailman.qth.net
>Subject: Re: [Boatanchors] DC Voltmeter Calibration
>
>I have reached the point where I don't believe my Metex DMM ME11 
>comes even close to an accurate voltage reading band-gap reference 
>or not.  I tested several fresh AA alkaline cells and they all 
>read 1.651V.  I don't trust its readings any further than I can 
>throw my 2KW amp power supply.
>
>David
>KW4DH
>
>On 1/7/2016 3:36 PM, Al Klase wrote:
> > CORRECT ANSWER!!!
> >
> > Modern DVM's all contain band-gap references. These are 
> semiconductor
> > devices that use quantum-physical principles to generate a know
> > voltage. They are much more accurate than anything else you're 
> going
> > to lay mortal hands upon. Sit down with a AA cell, and compare 
> two or
> > three DVM's. You'll be amazed.
> >
> > In my case:
> >
> > $300+ Fluke 87 1.588V
> > $70'ish Escort 1.589V
> > $11 Ebay cheapie 1.592V
> >
> > A VR tube or Zener diode won't even come close.
> >
> > Al
> >
> > Al Klase - N3FRQ
> > Jersey City, NJ
> > http://www.skywaves.ar88.net/
> >
> > On 1/7/2016 1:38 PM, D C _Mac_ Macdonald wrote:
> >> I'd bet you'd get a lot closer than what you have already by 
> using a
> >> cheap (sometimes even free) digital meter from Harbor Freight 
> as a
> >> "standard for comparison."
> >>   * * * * * * * * * * *
> >> * 73 - Mac, K2GKK/5 *
> >> * (Since 30 Nov 53) *
> >> * Oklahoma City, OK *
> >> * USAF, Ret'd 61-81 *
> >> ** FAA, Ret'd 94-10 *
> >> * * * * * * * * * * *
> >>
> >>
> >>> Date: Thu, 7 Jan 2016 13:02:11 -0500
> >>> To: boatanchors at mailman.qth.net
> >>> Subject: Re: [Boatanchors] DC Voltmeter Calibration
> >>> From: boatanchors at mailman.qth.net
> >>>
> >>> A quick and dirty way that will get you a lot closer than +/- 
> 45 VDC
> >>> would be to rig up a VR-150 running at about 20 mA.
> >>>
> >>> In a message dated 01/07/2016 10:25:07 AM Central Standard Time,
> >>> dhallam at knology.net writes:
> >>>> I obviously need to calibrate my DC voltmeters.  I was 
> setting the
> >>>> 300 VDC B+ on my signal generation after some repairs.  I 
> used 3
> >>>> voltmeters and got a spread of 45V among the 3 of them, low 
> 285V
> >>>> and high330V.  The low was a VTVM and the high  DVM.  What is a
> >>>> good standard to use that won't break the bank to 
> acquire?  I used
> >>>> to have some mercury batteries but they are a no, no any more.
> >>>>
> >>>> David
> >>>> KW4DH
> >>> Robert & Susan Downs - Houston
> >>> wa5cab dot com (Web Store)
> >>> MVPA 9480
> >>
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> > --
> > There are two possible outcomes: if the result confirms the
> > hypothesis,
>then you've made a measurement.
> > If the result is contrary to the hypothesis, then you've made a 
> discovery.
> > Enrico Fermi
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