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Digital Multimeter 500

Digital Multimeter 500; Franklin Electronics (ID = 1107567) Equipment
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Digital Multimeter 500; Franklin Electronics (ID = 1107567) Equipment
Franklin Electronics: Digital Multimeter 500 [Equipment] ID = 1107567 933x458
Select picture or schematic to display from thumbnails on the right and click for download.
For model Digital Multimeter 500, Franklin Electronics Inc.; Bridgeport, PA.:
While the Franklin Model 500 Digital Multimeter was not a military unit per se, the unit I have appears to have been a test unit for the United States Air Force, dedicated possibly to the Convair B-58 Hustler strategic bomber.
 
Country:  United States of America (USA)
Manufacturer / Brand:  Franklin Electronics Inc.; Bridgeport, PA.
Year: 1959 Category: Service- or Lab Equipment
Valves / Tubes 42: 12AT7 12AX7 12AU7 6J6 12B4 6AS6 5963 6844 BD310 0G3 0A2
Wave bands - without
Details
Power type and voltage Alternating Current supply (AC) / 120 Volt
Loudspeaker - - No sound reproduction output.
Power out
from Radiomuseum.org Model: Digital Multimeter 500 - Franklin Electronics Inc.;
Material Metal case
Shape Boatanchor (heavy military or commercial set).
Dimensions (WHD) 11.5 x 12 x 19 inch / 292 x 305 x 483 mm
Notes This is very early, accurate (chopper-stabilized) digital multimeter, utilizing four Burrough's Nixie tubes as readouts. The tube list above lists only unique numbers; the actual tube count is eleven 12AT7s, nine 12AX7s, one 12AU7, fourteen 6J6s (mostly used as Nixie tube drivers), one 12B4, one 6844 (most-significant digit Nixie tube with multiplexed anode), three BD310s (Nixie readout with one pin per cathode, common anode), one 6AS6, one 5963, two 0A2 tubes, one 0G3 tube. Power supply has six silicon rectifiers.
Net weight (2.2 lb = 1 kg) 46 lb (46 lb 0 oz) / 20.884 kg
Source of data - - Data from my own collection

Model page created by Hank Kaczmarski. See "Data change" for further contributors.



All listed radios etc. from Franklin Electronics Inc.; Bridgeport, PA.
Here you find 1 models, 1 with images and 0 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.




  
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