Please help. I need an adjustment procedure for a Amrel 39 multimeter.

Started by USMCPMEL, 05-02-2008 -- 10:58:27

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Hawaii596

#1
05-05-2008 -- 08:16:34
Wow!  That's a tough one.  I just spent a half hour researching and found basically nothing.  I went to the Amrel website and found no multimeters at all. Here are a few ideas (if it were me who had to do it):

- Is it possibly private labeled (i.e.: actually made by someone else)?  If so, maybe try to track down the real OEM for it.  That's a very intuitive pursuit.
- Is there a user you can query for some sort of manual to give you a good starting point?  Then use info found in the manual to help research.
- Is there possibly an Army T.B. type procedure for it with adjustments?
- Last Resort.... I've been known to open and reverse engineer the inside of a meter (experiment with the alignment pots inside to determine what they each do).  This is definitely a last resort and only for those not faint of metrological heart.

Don't know if the above is just a rehash or any help.  Hopefully its of some value.
"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

USMCPMEL

#2
07-16-2008 -- 14:44:47
I had to give up on that one but I have another one in front of me that is acting up too. So once again I ask does anyone have an alignment procedure for an Amrel 39 American Reliance multimeter?

RedBones

#3
07-21-2008 -- 11:58:29
Give them a ring- 1-800-654-9838.

I'm with Hawaii- It's probably a rebadge of an Extech or BK Precision POS.
I build Rockets, baby!

USMCPMEL

#4
07-21-2008 -- 15:46:58
Thanks I actually did the tinker and check method and figured out what pot I needed. The first meter I messed up the dc millamps when I fixed the DC volts and on the second meter I got it right the first time. Of course when I was done I did a complete recalibration on both meters and it all checked out good. Thanks for the help.

Hawaii596

#5
07-22-2008 -- 15:38:10
That method is definitely scary; and takes a lot of instinct to know if or when you should even try it. 

One thing I try to do in such cases is once I figure it all out (which pot does what), draw a diagram of the meter with my reverse-engineered adjustment pots so when (not if) it comes back out of spec again, It'll go easier.
"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
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