544-B
The General Radio 544-B Megohm Bridge was introduced in Catalog K1 (1939) and remained available through Catalog R (1963).
The Type 544-B Megohm Bridge is a null instrument using a Wheatstone bridge circuit. It uses a built-in vacuum tube voltmeter (VTVM) as a detector, and an AC power supply 544-P3 for both VTVM and the Unknown voltages.
The 544-B comes installed in an oak hardwood case with operating instructions attached to the inside of its cover. A flexible jack with lead is mounted in the cover for checking the internal standards as explained in the manual. The 544-B was also available modified for use with a battery power supply.
Specifications
- Range: 0.1 MΩ to 1,000,000 MΩ
- Accuracy: ±3% on the 0.1, 1, and 10 multipliers; ±4% on the 100 and 1000 multipliers
- Output Voltage AC Supply: 100 V or 500 V, jumper-selectable
- Short Circuit Current AC Supply: 12 mA
