544-B
The General Radio 544-B Megohm Bridge was introduced in 1939 Catalog K1 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 volt meter as a detector and an AC power supply 544-P3 for both VTVM and the Unknown voltages. Its 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 lOO and 1000 multipliers.
- Output Voltage AC Supply: 100 V or 500 V Jumper Selectable.
- Short Circuit Current AC Supply: 12 mA.
Links
- Experimenter describing Type 544-B July 1937
- Experimenter describing Type 544-B June 1939
- Experimenter describing Type 544-B February 1940
Catalog History
| Catalog | Year | Page Number |
|---|---|---|
| K1 | 1939 | 90 |
| K2 | 1942 | 84 |
| K3 | 1944 | 82 |
| K4 | 1945 | 83 |
| L | 1948 | 88 |
| M | 1951 | 92 |
| N | 1954 | 78 |
| O | 1956 | 16 |
| P | 1959 | 8 |
| Q | 1961 | 8 |
| R | 1963 | 47 |
