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Weston A.C. & D. C. Ammeter Model 370 #12879 Marked USN, US $74.95 – Picture 0
Weston A.C. & D. C. Ammeter Model 370 #12879 Marked USN, US $74.95 – Picture 1
Weston A.C. & D. C. Ammeter Model 370 #12879 Marked USN, US $74.95 – Picture 0
Weston A.C. & D. C. Ammeter Model 370 #12879 Marked USN, US $74.95 – Picture 1

Weston A.c. & D. C. Ammeter Model 370 #12879 Marked Usn

US $74.95

  • Phoenixville, Pennsylvania, United States
  • Jan 29th
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Vintage Weston A-C & D-C Milliammeter No. 12879 Model 370 (this has tag on front 131 Property of USN 146059) Milliamperes Alternating & Direct Current This Instrument is an Electrodynamometer Milliammeter It’s Indications are Based Upon the Absolute Ampere & if it is Properly Used they May be Relied Upon to Within 1/4 of One per cent of full Scale Value for Either Direct Current or Alternating Current of any Frequency from 25 to 1000 Cycles per Second It is Shielded from the Effect of External Magnetic Fields, To Obtain the Greatest Accuracy on Direct Current, the Mean of Reversed Magnetism in the Shield For Ordinary Measurements no Corrections for Temperature are Necessary, When Great Accuracy is Desired Multiply the Readings by [1-0.0002 (t-25 Degrees C)] where t is the Room Temperature Approximate Self Inductance of Field & Movable Coil, at Full Scale 0.009 Henry, at Half Scale 0.007,7 Henry Approximate Resistance of Field & Movable Coil 19 OHMS at 25 Degrees C Made in USA Manufactured by: Weston Part # Model 370 This was tested by a friend who said it worked fine-I do not know about meters so I will say untested as I wasn't  there when tested Please email me with any questions
Condition:
Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...
Brand Weston
MPN 370
Model 370
Country/Region of Manufacture United States

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