[volt-nuts] EDC VS330 Voltage Standard

[Joseph Gray]

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/Electronic-Development-Corporation-EDC-VS330-VOLTAGE-STANDARD-/161069656213?nma=true&si=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253D&orig_cvip=true&rt=nc&_trksid=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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>