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 Post subject: WTB: 50ua 4" meter
PostPosted: Feb Fri 02, 2018 6:13 pm 
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 862
Location: Brooklyn, NY 11217
I need a 50ua (Microamp) approximately 4" x 4" meter movement with an internal resistance of 2k or less. Would love a Roller-Smith version (FDJ model I believe), Simpson model number is 1329, Triplett is 420 I believe.

Shawn


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Fri 02, 2018 7:55 pm 
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Joined: Dec Tue 01, 2015 5:31 am
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Location: Columbus Ohio
New or Vintage?
New 4": https://www.ebay.com/itm/100mm-x-80mm-R ... SwpFlaRenZ

Vintage 3": https://www.ebay.com/itm/1-LAFAYETTE-Ua ... SwySlaIdEd

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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Sat 03, 2018 10:58 pm 
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 862
Location: Brooklyn, NY 11217
I need 4”, not 3” and the Chinese meter linked does not have the internal resistance listed. I know what it is for the Simpson, Triplett, etc .


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Sat 10, 2018 7:28 pm 
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1956
Location: Oswego, NY, USA
Shawn, I have available an older Triplett (w/ curved top logo) 420-PL (all clear acrylic plastic case & lens; not bakelite as you'd like; 4 11/16"W X 4 3/16"H); measures 1.64K-Ohms lug-to-lug, with a 10K-Ohm shunt calibration/factory resistor soldered across movement inside case; response is linear but about 3 percent low; one might (?) bring it to spec by removing the internal 10K shunt resistor? Also have an older Triplett 327-T (black bakelite w/ glass lens; 3" square) measures 1.57K lug-to-lug, reads in spec. Neither of these matches your exact need, but thought I'd mention them. Price negotiable;fair. I realize maybe you found something by now. Fred


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Sat 10, 2018 11:11 pm 
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 315
Location: hillsborough, nc
I have a nice Mercer, possibly made by Simpson, based on some Ebay listings.
4.5X4, perfect condition.
$20, shipped 2 u.
Wilson

Attachment:
jse_Mercer_Meter.jpg
jse_Mercer_Meter.jpg [ 76.13 KiB | Viewed 172 times ]


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Mon 12, 2018 4:57 am 
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 862
Location: Brooklyn, NY 11217
Can you post the back of the Mercer? Can you measure the impedance between the lugs?


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Mon 12, 2018 5:35 am 
Member

Joined: Mar Sat 08, 2008 3:21 am
Posts: 315
Location: hillsborough, nc
1900 Ohms.

Attachment:
jse_Mercer2.jpg
jse_Mercer2.jpg [ 71 KiB | Viewed 129 times ]


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Mon 12, 2018 5:36 am 
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 315
Location: hillsborough, nc
Takes 2 1/4" hole.
WL


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Tue 13, 2018 6:44 pm 
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 315
Location: hillsborough, nc
OK, I have spent a half hour to get access to the back of the meter, take pictures, and post them.
I sure hope you want the meter!
WL


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Tue 13, 2018 8:02 pm 
Member

Joined: Aug Sat 02, 2014 3:59 am
Posts: 862
Location: Brooklyn, NY 11217
Sorry, I missed the last post. I will take it.


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 Post subject: Re: WTB: 50ua 4" meter
PostPosted: Feb Tue 13, 2018 8:39 pm 
Member

Joined: Mar Sat 08, 2008 3:21 am
Posts: 315
Location: hillsborough, nc
PM sent with Paypal info, etc.
Let me know if you don't get it.
I don't dee it here.
WL


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