[volt-nuts] EDC VS330 Voltage Standard

Sun Jul 28 20:24:12 EDT 2013

Same issue as with the time-nuts and the man with one watch versus more.  No
way to tell except to 'vote with the majority'.

So, the answer is 'probably'.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Joseph Gray
Sent: Sunday, July 28, 2013 6:37 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] EDC VS330 Voltage Standard

When I get the VS330, I think I'll first try setting it for 5 V and
comparing the 3478A reading with what I got with the MAX6350. If I get about
the same reading of 5.0026 V, is it safe to assume that the 3478A is in
error?

Joe Gray
W5JG

On Sun, Jul 28, 2013 at 5:02 PM, Joseph Gray <jgray at zianet.com> wrote:

> Thanks for the subject. Actually, I had intended to put that exact 
> subject on it, but forgot and clicked send.
>
> I couldn't find even a partial manual for the VS330, but the 1030A 
> partial manual looks like it would be very similar. Would you please 
> send me the email contact at K-H that sent you the manual?
>
> Joe Gray
> W5JG
>
>
>
> On Sun, Jul 28, 2013 at 4:11 PM, J. L. Trantham <jltran at att.net> wrote:
>
>> Joe,
>>
>> Pardon my adding a 'subject' to the thread.
>>
>> If all you want is a 'house standard', you're probably 'in the ball
park'.
>> If you want to set up a home 'metrology lab' (careful, this 'metrology'
>> stuff can be as addicting as the 'time' stuff), you should get 
>> something calibrated by an outside lab.  I would send the highest 
>> resolution meter out for cal.  I don't know if calibration services 
>> are available for the VS330.
>>
>> If the 3478A is it, I would vote to send the 3478A to Agilent for 
>> their 'Agilent' cal ($204.22 per their website) and see where you 
>> are.  The meters I have sent to Agilent for their 'Agilent' cal, come 
>> back with 'as found'
>> and 'as left' values and is very informative about the capabilities 
>> of the meters.  The meters I have returned for a repeat 'Agilent' cal 
>> have all returned with their 'as found' values still in cal.
>>
>> Once you get the 3478A back, you will have a number of 'calibrated'
>> measurement capabilities.
>>
>> Do you have a manual?  I have an EDC CR103 voltage and current 
>> standard and was able to find a 'partial' manual on the web.  It 
>> noted that a complete manual was available from Krohn-Hite and to 
>> contact them at (508)
>> 508-1660
>> or sales at krohn-hite.com to purchase a complete manual.  When I 
>> emailed them about obtaining one, I received a complete .PDF manual 
>> by return email from one of their service engineers.  Others have had 
>> a similar experience.
>>  When
>> asked, Krohn-Hite asked that the manuals not be 'shared'.  So, if you 
>> can't find one, you might try contacting them.
>>
>> Good luck.
>>
>> Joe
>>
>>
>>
>> -----Original Message-----
>> From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] 
>> On Behalf Of Joseph Gray
>> Sent: Sunday, July 28, 2013 4:06 PM
>> To: volt-nuts at febo.com
>> Subject: [volt-nuts] (no subject)
>>
>> I just had a friend buy this for me (I don't have an ebay account). I 
>> hope I didn't make a mistake.
>>
>>
>> http://www.ebay.com/itm/Electronic-Development-Corporation-EDC-VS330-
>> VOLTAGE
>>
>> -STANDARD-/161069656213?nma=true&si=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253D&
>> orig_cv 
>> ip=true&rt=nc&_trksid=p2047675.l2557<http://www.ebay.com/itm/Electron
>> ic-Development-Corporation-EDC-VS330-VOLTAGE-STANDARD-/161069656213?n
>> ma=true&si=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253D&orig_cvip=true&rt=nc&_trk
>> sid=p2047675.l2557>
>>
>> Of course, once I have it, it's the chicken and egg problem. The best 
>> I have to check it against is an HP 3478A that was last calibrated an 
>> unknown number of years ago. It has a little round sticker over the 
>> CAL switch on the front, but no dated calibration label that I can 
>> see. It came from a repair facility that closed a few years ago.
>>
>> Actually, the reason I was tempted to buy the VS330 was because I 
>> think the 3478A is off a bit. A while back, I built a simple 5V 
>> reference with a MAX6350. The 3478A read high. I took the reference 
>> to work and the best Fluke handheld we have was dead on (I don't 
>> remember the model right now).
>>
>> I made the measurement again last night and the 3478A reads 5.0026 V, 
>> with the last digit fluctuating. Room temperature was 26 C.
>>
>> I guess obsessing about these things has brought me here to the Volt
Nuts.
>> I have been on Time Nuts for several years.
>>
>> Joe Gray
>> W5JG
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