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

[Patrick Thompson]

Might not be the same critter; however...

www.eserviceinfo.com/downloadsm/59444/Sanwa_*YX-360TR*.html

Pat
wa4tuk<http://www.bing.com/search?q=YX-360TR&form=MOZESB&pc=MOZT#>

On 3/9/2014 4:57 PM, bonddaleena at aol.com wrote:
>   
>
>   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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