[volt-nuts] EDC VS330 Voltage Standard

Sun Jul 28 19:08:14 EDT 2013

Joe,

As I recall, I just sent an email to sales at krohn-hite.com regarding my CR103
and how to obtain the manual.

I can go back through the emails but it will take a while to find out who
sent it to me.

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 6:02 PM
To: Discussion of precise voltage measurement
Subject: Re: [volt-nuts] EDC VS330 Voltage Standard

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-V
> OLTAGE
>
> -STANDARD-/161069656213?nma=true&si=PiGtcBMSdSOxgbm9DhiZ6iLo1GQ%253D&o
> rig_cv
> ip=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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