[Test-Equipment] Test-Equipment Digest, Vol 119, Issue 9

[bonddaleena at aol.com]

Hi Ed. I have several of these meters. In addition to two different spellings of the name: "Sunwa + Sunwai", they are all different inside....
This company make a LOT of different models, even within the 360 family......
The one that had a problem has SM resistors, the others (newer) have regular resistors. My problem was one of the two parallel SM resistors for X1 was broken. Strangely enough, at each end of the SM resistor part of the circuit, there was a through hole for a regular resistor. I just selected a value that gave me a accurate mid-scale reading on X1.
The meter is ultra simple and yes, Zero ohms is full scale.
Off to other vexing projects....

ron
N4UE

 

 

 

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Sent: Sun, Mar 16, 2014 12:01 pm
Subject: Test-Equipment Digest, Vol 119, Issue 9


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Today's Topics:

   1. Re: "possessed'" VOM(s) (k4pf at juno.com)


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Message: 1
Date: Sat, 15 Mar 2014 22:01:12 GMT
From: "k4pf at juno.com" <k4pf at juno.com>
To: test-equipment at mailman.qth.net
Subject: Re: [Test-Equipment] "possessed'" VOM(s)
Message-ID: <20140315.180112.26153.0 at webmail02.vgs.untd.com>
Content-Type: text/plain; charset=windows-1252


> Ron N4UE wrote
> Bill, you hit it! I looked at the SM resistors and was trying to read the code 
on the resistors in the X1 circuit. What I thought was flux or some other crud 
on the resistor, was indeed a fracture. Using an old resistor sub box and a 
precision resistor (in the X1 circuit), I simply placed the new resistor in the 
unused thru-hole already there.
This has been one of those things that has been bugging me, but just now had 
time to look at it.

Hi, Ron

Re: Sanwa YX-360TR mutlitester manual, Parts List, page 24 -
(link provided by Pat WA4TUK)

I see that R21 (19 Ohm resistor) used for X1 scale of the imported VOM
is shown in the parts list as "shunt", 
along with several other resistors used for Ohms readings.

Too bad they didn't include a schematic.  It sounds like they're using 
a separate current generator circuit and DC voltmeter circuit
across the sense terminals, like a VTVM or DMM Ohms circuit,
unlike the simple series Ohms circuit used in a Triplett 310 VOM.

Is zero Ohms full scale reading of the meter, like a standard series 
Ohmmeter?

73,
Ed Knobloch



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End of Test-Equipment Digest, Vol 119, Issue 9
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