[Test-Equipment] "possessed'" VOM(s)

[bonddaleena at aol.com]

 Hi Bill. No, it's strictly analog. I have a LOT of VTVMs, etc, as mentioned. All were bought off of eBay and I have refurbished them all. I collect Test Equipment (some kind of disorder). Just to put a stake in the ground, I have over 24 'scopes I have fixed / refurbished. This particular VOM is a 'Sunwei Model YX-360TR'. These are only $15 on eBay, with free shipping, so I consider them a 'throw away'.
I have several other 'nicer' VOMs that are just digital and some that are analog / digital.
I guess I'm 'not right', because I like the strictly analog meters, just for the reasons listed above. Yes, I have several 260 meters also......
The only thing I can figger is that one of the sm resistors (for the X1 range) is shorted. All the other resistance ranges are fine. 
What is SO frustrating is there is almost NOTHING in there!

So, I ordered another Sunwei and will determine what's up.
These are a pretty nice VOM for the $. MUCH better than the VOMs sold in Lowes and Home Depot.... ha ha

ron

 

-----Original Message-----
From: Fuqua, Bill L <wlfuqu00 at uky.edu>
To: bonddaleena <bonddaleena at aol.com>
Sent: Sun, Mar 9, 2014 3:57 pm
Subject: RE: [Test-Equipment] "possessed'" VOM(s)


  Can you tell us more about the cheap Chinese VOM. Is it digital as all of the 
current ones are and cost a few bucks.
73
Bill wa4lav
 
________________________________________
From: test-equipment-bounces at mailman.qth.net [test-equipment-bounces at mailman.qth.net] 
on behalf of bonddaleena at aol.com [bonddaleena at aol.com]
Sent: Saturday, March 08, 2014 6:00 PM
To: test-equipment at mailman.qth.net
Subject: [Test-Equipment] "possessed'" VOM(s)

OK, I'm almost embarrassed to post this, but it's driving me crazy....
I have a LOT of VTVMs, FET VOMs, VOMs, etc. At one of my test benches, I use an 
el-cheapo Chinese VOM that gets a lot of use. Although for serious work, I have 
a dedicated VTVM there, the VOM gets a lot of use.
Recently, I noticed that the X1 ohms function didn't work correctly. (all other 
functions/ranges are OK). When selecting X1, no matter what resistor is being 
measured, it indicates ZERO Ohms. Of course, when not connected, the meter reads 
infinity.
ie: putting a 1K resistor across the leads, it reads 0 Ohms, but when switching 
to X10, X100, X1K, the readings are OK.
So, I pull it apart and other than some sm resistors and a couple of diodes for 
AC/Audio, there's nothing in there. I have looked at the contacts, the board, 
etc, and can see nothing wrong.

The thing that bothers me, is that this problem is exactly the opposite of what 
would seem logical.......If a resistor in the circuit were open, there wouldn't 
be ANY movement on X1. If a resistor were shorted, wouldn't there be an 
indication as soon as X1 was selected?

Tomorrow, I'll try to check the sm resistors but they have some strange 
markings.

What was REALLY crazy was this... I pulled out one of my Triplett 310 VOMs and 
it did the SAME thing. OK, the 310s are beat up and have been around the world 
with me, but at this point, it was time to quit.

Is there ANYTHING in the circuit (other than the fuse) on X1? Sure doesn't look 
like it.
All my other meters check the resistor OK.

ron
N4UE
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