[volt-nuts] EDC VS330 Voltage Standard

[J. L. Trantham]

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

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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