544-B: Difference between revisions
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* [[Media:GRwiki 544-B Megohm Bridge 458-I 1954.pdf|General Radio 544-B Megohm Bridge 458-I 1954]] | * [[Media:GRwiki 544-B Megohm Bridge 458-I 1954.pdf|General Radio 544-B Megohm Bridge 458-I 1954]] | ||
* [[Media:GR 544-B Megohm Bridge 458-M 02_1960.pdf|General Radio 544-B Megohm Bridge 458-M 1960]] | |||
{{Catalog History}} | {{Catalog History}} | ||
* [[Media:GRwiki_Catalog_K1_OCR_1939.pdf|K1 (1939)]], p.90 | * [[Media:GRwiki_Catalog_K1_OCR_1939.pdf|K1 (1939)]], p.90 | ||
Revision as of 20:22, 31 March 2024
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 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
Links
- Experimenter describing Type 544-B July 1937
- Experimenter describing Type 544-B June 1939
- Experimenter describing Type 544-B February 1940
