544-B: Difference between revisions
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{{GR Product | {{GR Product | ||
|model=544-B | |model=544-B | ||
|codes=ALOOF,ANNOY,AGREE | |||
|class=impedance measurement | |class=impedance measurement | ||
|summary= | |summary=Megohm bridge | ||
|image=GR 544-B Front Close-up.jpg | |image=GR 544-B Front Close-up.jpg | ||
|caption=General Radio 544-B Megohm Bridge | |caption=General Radio 544-B Megohm Bridge | ||
| Line 11: | Line 12: | ||
|manuals= | |manuals= | ||
* [[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}} | |||
}} | }} | ||
The | The {{Title|General Radio 544-B Megohm Bridge}} was introduced in {{Catalog K1}} and remained available through {{Catalog R}}, after which it was replaced by the [[1644-A]]. | ||
The Type 544-B Megohm Bridge is a null instrument using a Wheatstone bridge circuit. It uses a built in vacuum tube | 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== | ==Specifications== | ||
* '''Range:''' 0.1 MΩ to 1,000,000 MΩ | * '''Range:''' 0.1 MΩ to 1,000,000 MΩ | ||
* '''Accuracy:''' ±3% on the 0.1, 1, and 10 multipliers; ±4% on the | * '''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 | * '''Output Voltage AC Supply:''' 100 V or 500 V, jumper-selectable | ||
* '''Short Circuit Current AC Supply:''' 12 mA | * '''Short Circuit Current AC Supply:''' 12 mA | ||
==Links== | ==Links== | ||
| Line 27: | Line 35: | ||
* [[Media:GR Exp 544-B 06_1939.pdf|Experimenter describing Type 544-B June 1939]] | * [[Media:GR Exp 544-B 06_1939.pdf|Experimenter describing Type 544-B June 1939]] | ||
* [[Media:GR Exp 544-B 02_1940.pdf|Experimenter describing Type 544-B February 1940]] | * [[Media:GR Exp 544-B 02_1940.pdf|Experimenter describing Type 544-B February 1940]] | ||
==Photos== | ==Photos== | ||
| Line 70: | Line 48: | ||
GR 544-B Case Inside.jpg | GR 544-B Case Inside.jpg | ||
</gallery> | </gallery> | ||
[[Category:Impedance measurement]] | [[Category:Impedance measurement]] | ||
Latest revision as of 18:45, 16 April 2024
The General Radio 544-B Megohm Bridge was introduced in Catalog K1 (1939) and remained available through Catalog R (1963), after which it was replaced by the 1644-A.
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
