[volt-nuts] Valhalla 2703 AC calibrator

gbusg gbusg at comcast.net
Thu Mar 31 01:24:39 UTC 2011

Good job Mark!

I also have a Valhalla 2703. Mine gets past the "Hello" turn-on sequence OK. 
Display and front panel control seem OK. But when I try putting its output 
in "Operate" mode, it instantly switches back to "Standby". On its 120V 
range (and higher), its red HV symbol flashes for an instant before it plops 
back to standby. So I suspect it's automatically shutting-down due to an 
"open sense loop" or some other cause of over-voltage?

I've not performed any troubleshooting in it yet. ...It's just sitting on 
the shelf, waiting for further action. I've not yet looked for an online 
manual. I doubt there's one online, but if you run across that, let me know.

Keep us informed as to how stable your 2703 seems.


----- Original Message ----- 
From: "Mark Sims" <holrum at hotmail.com>
To: <volt-nuts at febo.com>
Sent: Wednesday, March 30, 2011 6:02 PM
Subject: [volt-nuts] Valhalla 2703 AC calibrator

I recently snagged a Valhalla 2703 AC calibrator off of Ebay for less than 
$200 shipped. It's a pretty nice machine that goes from 1 uV to 1200V 
without an external amp. And it weighs less than my Fluke 5200A alone.

It was shown powered up with "-" in all the LED digits. The opening bid was 
low enough to risk it, so I put in a low ball bid (and luckily nobody else 
did). It arrived a couple days later in pretty good shape. I opened it up 
and saw nothing out of whack. No magic smoke smell, etc. The fan was rather 
noisy and the the calibration key was missing.

The processor, eprom, and ram chips were in sockets so I reseated them and 
powered it up again. Voila! Display said "Hello" and everything works fine. 
Running it past the HP 3458A's showed all ranges were in spec. I replaced 
the fan, pulled the calibration key switch and took it to my local locksmith 
(got the "oh, no it's him again" look). 2 hours and $12 later I had two 
calibration keys.

I've had it running for a couple of days and the readings are very stable. 
I'll let it stew in its own juices for a couple of weeks and then run the 
calibration sequence.
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