Simpson 260 - The Original Model

The Original Simpson 260®

Analog - VOM

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The original Simpson 260 was introduced in the 1930's, and was still advertised in 1946.

The "Series" designation would not start until the 260 Series 2A. The probe jacks accept the pin type leads,

No Taut Band Suspension, molded case or mirrored dial, those were still a few years away.

The operating instructions are two pages, typewritten and dated July 20, 1939.

Controls include: Ohms zero adjustment, AC - DC - Output, a 12 position Function / Range selector switch,

and four recessed probe jacks. The labeling is silk screened on the front, the engraved lettering would

come with the next version. Note that they used "MIC" for Micro on the 100μA range.

Back view with cover off. A lot of hand wiring here, Printed Circuit Boards were not around.

There are no fuses used in this unit. There are no calibration trim pots.

The original batteries used in this model are two 3 Volt batteries, (Eveready 905)

and one ("C" Size) 1½ Volt battery. However, most 3 Volt batteries were replaced using two "AA"

size batteries soldered in series on each side.

All batteries are soldered into place.

Case Size: 6¾ " x 5¼ " x 3 " - Weight: 3 Pounds

Simpson 260 Specifications

DC VOLTAGE

Ranges 2.5V, 10V, 50V, 250V, 1000V

Accuracy 3% of full scale * Sensitivity Unknown

AC VOLTAGE

Ranges 2.5V, 10V, 50V, 250V, 1000V

Accuracy 5% of full scale * Sensitivity Unknown

Rated Circuit-To-Ground Voltage Unknown

DECIBEL

5 Ranges 0, +12, +26, +40, +52dB

DC CURRENT

Ranges 100μA, 10mA, l00mA, 500mA

Accuracy Unknown

RESISTANCE

Ranges Rx 1, Rx 100, Rx 10K

Accuracy Unknown

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