type 486 output meter
Datecirca 1929
Inventory NumberRS0194
ClassificationTest Equipment
Subject
Maker
General Radio Company
1915-present
Cultural Region
Place of Origin
Dimensions10 x 18.5 x 12.5 cm (3 15/16 x 7 5/16 x 4 15/16 in.)
Material
DescriptionA General Radio Co.-Cruft type 486 output meter made of metal with bakelite fixtures and glass face.
Signedetched and white filled on front panel, bottom center: OUTPUT METER / TYPE 486 SERIAL No 49/ GENERAL RADIO COMPANY / CAMBRIDGE, MASS.
on face of meter: GENERAL (GE logo) ELECTRIC / U.S.A.
FunctionPossible function: In 1929 the idea of combining a miniature copper-oxide rectifier with asensitive dc meter was conceived, producing for the first time a simple instrument capable of measuring voltage over the wide frequency range of something like 20 to 20,000 cycles. This was incorporated with a voltage divider and called theType 486 Output Meter.
(History of General Radio) www.ietlabs.com/pdf/history.pdf
(History of General Radio) www.ietlabs.com/pdf/history.pdf
Historical AttributesCruft
