732A Output not stable

Started by Karl, 07-18-2013 -- 12:47:11

Previous topic - Next topic
Print
Go Down Pages1
User actions

Karl

07-18-2013 -- 12:47:11
Hi I've got a 732A I bought used and on my 1281 it shows the 10V dropping and then resuming at 10V. Appears every 30 seconds or so.
Just powered it on again from cold and it appeared within 5 minutes.
Thought I'd see if its a known problem/fix before I open it. Anyone familiar with this?
Thanks,
Karl

Hawaii596

#1
07-19-2013 -- 10:04:22
I'm not a 732A expert.  I have a bunch of them.  I would let it run for 24 hours and see how it does then.  Again, I'm not an expert.  That's just what I would do.  I think they need plenty of time to stabilize.  Maybe an expert may have better info.  If so, I'll be interested as well.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883

Squidley

#2
07-19-2013 -- 13:42:53
I'd say let it sit warm over the weekend if it was cold and the batteries were dead...
I've had simular types problems with NiCad battery powered equipment that did that when they were dead, bad, or extremely low...
Douglas J. Baird, USN(ret),

jwilley127

#4
07-31-2013 -- 10:38:45
I know a great repair service for any electrical standards/artifacts.  Drop me a line for more information.
JW Solutions
Resistance, Temperature & Pressure Standards
Test Equipment & Accessories
Calibration & Repair Referrals
407.340.7323
jwilley127@gmail.com

JFP

#5
12-24-2013 -- 05:09:43
I brought several times a 732A, battery powered in my car, to a calibration laboratory and it needed almost 8 days to stabilize...

Squidley

#6
12-26-2013 -- 09:18:07
Try pulling the batteries and running it on straight AC...
Douglas J. Baird, USN(ret),

Hawaii596

#7
12-30-2013 -- 07:52:52
8 days seems like a long time to stabilize.  Fluke has the DC voltage maintenance program where they send you their reference via overnight shipment (Fedex, etc.), you spend a week making readings, then overnight ship their standard back to them.  They have to make readings on their standard before and after it is shipped to you.  And it has to be stable enough both before, during and after your comparison measurements.  So they must be able to get good readings in all three of those portions of the process.

So it seems like perhaps there is something wrong with a DC standard that takes 8 days to stabilize.  One question to JFP is whether he means powered by its own on-board battery, or connected to the car battery.  That could perhaps make a difference. 

Just a few thoughts.
"I often say that when you can measure what you are speaking about, and express it in numbers, you know something about it; but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and unsatisfactory kind."
Lord Kelvin (1824-1907)
from lecture to the Institute of Civil Engineers, 3 May 1883
Print
Go Up Pages1
User actions