[Test-Equipment] Triplett 310 dating Was Triplett 310 leads

[Barry]

Hi Ed,

I have not found a "Type" labeled anywhere on my meter and, while I'm no expert here, I think that may indicate it's a Type 1.  Apparently both the Type 1 and Type 2 have a single single AC scale where the later models have three AC scales.

Mine has the range switch whose arm is underneath the range selections whereas some newer models have that arm above plastic faceplate.

I'm still unsure, though, why the range resistors in the Model 10 I have differ from the values shown in the schematic.  They're wire-wound resistors and virtually spot on their labeled values.  I just can't explain that.

Thanks,
Barry - N4BUQ

----- Original Message -----
> From: k4pf at juno.com
> To: test-equipment at mailman.qth.net
> Sent: Monday, April 5, 2021 2:14:32 PM
> Subject: Re: [Test-Equipment] Triplett 310 dating   Was Triplett 310 leads
> 
> 
> 
> > Barry <n4buq at knology.net> wrote
> <snip
> This brings me to wonder if I have a different version
> of the Model 10 and, even more so, which version of the 310 I have.
> I understand there are a few(?) different versions but
> I cannot see anything in the 310 or the 10 that indicates
> which version those are.  That leads me to think
> that they both are the original versions but I don't have anything
> to back that up. <snip>
> 
> Hi, Barry
> 
> Sorry that I missed your posting earlier.
> I have several Triplett 310's, the earliest being a type 2
> (written on the panel meter just below the model number).
> It requires 4 screws to be removed to get access
> to the battery compartment.  The newer series 310's
> have a slide latch that allows removal of the battery compartment
> cover without tools.
> 
> Another improvement was changing the range switch to a top-side
> position, so there would no slot needed at the bottom of the front
> panel for the range switch to travel. (The previous design allowed
> dust to enter the instrument.)  My type 3 has the old style range
> switch, my type 5 has the newer design.
> 
> The first model 310 came out in 1955.  The model 310C added
> a polarity reversing switch on the side.
> 
> 73,
> Ed Knobloch
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