thermal multimeter
Inventory Number2012-1-0040
ClassificationMultimeter
Subject
Maker
Rawson Electrical Instrument Company
1918 - 1968
Cultural Region
Place of Origin
Place of Use
Dimensions10.6 × 20 × 18.9 cm (4 3/16 × 7 7/8 × 7 7/16 in.)
Material
DescriptionSquare walnut case with flat leather handle and hinged lid.
Inside is the instrument, with a bakelite casing. Fan-shaped window at top of the panel, with the Rawson standard pointer (with a double, o-shaped section over the mirror) with a reflective band under the scale.
Double non-linear scale, top scale from 0-100 and bottom scale from 0-30, AC or DC thermal.
Under scale at upper right knob labeled “.3”, “VOLTS ONLY”, “3”, “10”, “30”, “300”, “1000”, “CURRENT ONLY “, “3000”, and “SHORT”. Under dial black capped binding post labeled “VOLTS RANGE .3-1000 V”
Under the scale at lower left are two black capped binding posts top labeled “COMMON”, bottom labeled “CURRENT RANGES 10-3000 MA”. Raised disk-shaped section with the "ZERO" and "CLAMP" dials, arrow on “CLAMP “ dial and labeled underneath “UNCLAMP BEFORE USING.
Inside is the instrument, with a bakelite casing. Fan-shaped window at top of the panel, with the Rawson standard pointer (with a double, o-shaped section over the mirror) with a reflective band under the scale.
Double non-linear scale, top scale from 0-100 and bottom scale from 0-30, AC or DC thermal.
Under scale at upper right knob labeled “.3”, “VOLTS ONLY”, “3”, “10”, “30”, “300”, “1000”, “CURRENT ONLY “, “3000”, and “SHORT”. Under dial black capped binding post labeled “VOLTS RANGE .3-1000 V”
Under the scale at lower left are two black capped binding posts top labeled “COMMON”, bottom labeled “CURRENT RANGES 10-3000 MA”. Raised disk-shaped section with the "ZERO" and "CLAMP" dials, arrow on “CLAMP “ dial and labeled underneath “UNCLAMP BEFORE USING.
Signedprinted on face of meter: THERMAL / MULTIMETER / RAWSON ELECTRICAL INSTRUMENT CO., INC. / CAMBRIDGE, MASS. / TYPE 502A No. 14279
FunctionA multimeter (or multitester or volt/ohm meter or VOM) measures multiple characteristics often including but not limited to voltage, current and resistance.
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Alternating current meter capable of measuring not only the high values but also the lowest in milliamps and millivolts independent of frequency errors at least up to 2,000 cycles per second and one which could be easily checked against available D.C. Standards has been met….
The Thermal Multimeter has 13 ranges covering from 2 milliamps to 1 ampere and from 60 millivolts to 1,000 volts.
- Rawson Single & Double Pivot Meters Catalog, Supplementary Bulletin 105
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Alternating current meter capable of measuring not only the high values but also the lowest in milliamps and millivolts independent of frequency errors at least up to 2,000 cycles per second and one which could be easily checked against available D.C. Standards has been met….
The Thermal Multimeter has 13 ranges covering from 2 milliamps to 1 ampere and from 60 millivolts to 1,000 volts.
- Rawson Single & Double Pivot Meters Catalog, Supplementary Bulletin 105
Harvard Cyclotron Laboratory
Date: 1947-2002
Object number: 2003-1-0291