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sfox7076
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Post subject: WTB: 50ua 4" meter  Posted: Feb Fri 02, 2018 6:13 pm |
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 1206
Location: Brooklyn, NY 11217
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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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glue_ru
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Fri 02, 2018 7:55 pm |
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Joined: Dec Tue 01, 2015 5:31 am
Posts: 2705
Location: Columbus Ohio
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sfox7076
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Sat 03, 2018 10:58 pm |
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 1206
Location: Brooklyn, NY 11217
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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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Fred Scoles
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Sat 10, 2018 7:28 pm |
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Joined: Jan Thu 01, 1970 1:00 am
Posts: 1911
Location: Oswego, NY, USA
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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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infomet
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Sat 10, 2018 11:11 pm |
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 567
Location: hillsborough, nc
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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 [ 76.13 KiB | Viewed 914 times ]
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sfox7076
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Mon 12, 2018 4:57 am |
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 1206
Location: Brooklyn, NY 11217
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Can you post the back of the Mercer? Can you measure the impedance between the lugs?
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infomet
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Mon 12, 2018 5:35 am |
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 567
Location: hillsborough, nc
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1900 Ohms. Attachment:
jse_Mercer2.jpg [ 71 KiB | Viewed 871 times ]
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infomet
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Mon 12, 2018 5:36 am |
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 567
Location: hillsborough, nc
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infomet
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Tue 13, 2018 6:44 pm |
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 567
Location: hillsborough, nc
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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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sfox7076
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Tue 13, 2018 8:02 pm |
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Joined: Aug Sat 02, 2014 3:59 am
Posts: 1206
Location: Brooklyn, NY 11217
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Sorry, I missed the last post. I will take it.
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infomet
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Post subject: Re: WTB: 50ua 4" meter Posted: Feb Tue 13, 2018 8:39 pm |
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Joined: Mar Sat 08, 2008 3:21 am
Posts: 567
Location: hillsborough, nc
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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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