1230-A

The General Radio 1230-A Electrometer and DC Amplifier was introduced in 1956 Catalog O and remained available through Catalog T 1968.

General Radio 1230-A

electrometer and dc amplifier General Radio 1230-A Electrometer and DC Amplifier Available from 1956 to 1968 Manuals General Radio 1230-A Electrometer and DC Amplifier Manual 1230-0100F 1962 (All manuals in PDF format unless noted otherwise)

Specifications

RANGES OF MEASUREMENT
Voltage: ±30, 100, and 300 mV; ±1, 3, and 10 V; dc full scale.
Current: ±1 mA dc, full scale, to ±0.3 pA full scale; Measured in terms of voltage.
Resistance: direct reading from 300 kΩ to 10 TΩ full scale; There are 16 ranges, two per decade. Voltage across the unknown resistance is 9.1 V.
ACCURACY
Voltage: ±2% of full scale on the five highest ranges, ±4% of full scale on the 30 mV range.
Current: ±3% of full scale from 1 mA to 1 nA, ±10% of full scale from 300 pA to 0.3 pA.
Resistance: ±3% from 300 kΩ to 10 MΩ at full scale (low-resistance end), ±8% from 3 MΩ to 10 TΩ.