1644-A: Difference between revisions
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|model=1644-A | |model=1644-A | ||
|class=impedance measurement | |class=impedance measurement | ||
|summary= | |summary=Megohm bridge | ||
|image=GR 1644-A Front A.jpg | |image=GR 1644-A Front A.jpg | ||
|caption=General Radio 1644-A Megohm Bridge | |caption=General Radio 1644-A Megohm Bridge | ||
|series= | |series= | ||
|introduced=1965 | |introduced=1965 | ||
|discontinued= | |discontinued=1978+ | ||
|designers= | |designers= | ||
|manuals= | |manuals= | ||
* [[Media:GR 1644-A Megohm Bridge 1644-0100-A 1964.pdf|General Radio 1644-A Manual 1644-0100-A 1964]] | * [[Media:GR 1644-A Megohm Bridge 1644-0100-A 1964.pdf|General Radio 1644-A Manual 1644-0100-A 1964]] | ||
{{Catalog History}} | |||
}} | }} | ||
The {{Title|General Radio 1644-A Megohm Bridge}} was introduced in {{Catalog S}}. It remained available through {{Catalog 1978}}. It replaced the Type [[544-B]]. | |||
The | The Type 1644-A is a modified Wheatstone bridge design used for resistance measurements in 9 ranges from 1 kΩ to 1 TΩ. | ||
It contains a built-in vacuum tube detector and high voltage power supply. | |||
Besides measuring resistors, its uses are measuring semiconductor leakage, capacitor resistance and insulation resistance, for example. | |||
==Specifications== | ==Specifications== | ||
* '''Resistance Range:''' 1 kΩ to 1000 TΩ in ten decade ranges | * '''Resistance Range:''' 1 kΩ to 1000 TΩ in ten decade ranges | ||
* '''Accuracy:''' from 1 kΩ to 10 GΩ | * '''Accuracy:''' ±1% basic accuracy from 1 kΩ to 10 GΩ (see manual) | ||
* '''Test Voltages:''' 10, 20, 50, 100, 200, 500, and 1000 Volts | * '''Test Voltages:''' 10, 20, 50, 100, 200, 500, and 1000 Volts | ||
* '''Short-Circuit Current:''' <15 mA at 10 V to 50 V; <10 mA at 100 to 1000 V | * '''Short-Circuit Current:''' <15 mA at 10 V to 50 V; <10 mA at 100 to 1000 V | ||
==Links== | ==Links== | ||
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GR 1644-A Open Side Case.jpg | GR 1644-A Open Side Case.jpg | ||
GR 1644-A Inside Bottom.jpg | GR 1644-A Inside Bottom.jpg | ||
GR 1644-A Inside Rear B.jpg | GR 1644-A Inside Rear B.jpg|Detector Board and Foil Side of Power Supply | ||
GR 1644-A Inside Rear Board.jpg | GR 1644-A Power Supply Board.jpg|Power Supply Board Close-Up | ||
GR 1644-A Inside Rear Board.jpg|Detector Board Close-Up | |||
GR 1644-A Inside Rear.jpg | GR 1644-A Inside Rear.jpg | ||
GR 1644-A Inside Right.jpg | GR 1644-A Inside Right.jpg | ||
Latest revision as of 18:56, 16 April 2024
The General Radio 1644-A Megohm Bridge was introduced in Catalog S (1965). It remained available through Catalog 1978. It replaced the Type 544-B.
The Type 1644-A is a modified Wheatstone bridge design used for resistance measurements in 9 ranges from 1 kΩ to 1 TΩ. It contains a built-in vacuum tube detector and high voltage power supply. Besides measuring resistors, its uses are measuring semiconductor leakage, capacitor resistance and insulation resistance, for example.
Specifications
- Resistance Range: 1 kΩ to 1000 TΩ in ten decade ranges
- Accuracy: ±1% basic accuracy from 1 kΩ to 10 GΩ (see manual)
- Test Voltages: 10, 20, 50, 100, 200, 500, and 1000 Volts
- Short-Circuit Current: <15 mA at 10 V to 50 V; <10 mA at 100 to 1000 V
Links
Photos
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Detector Board and Foil Side of Power Supply
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Power Supply Board Close-Up
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Detector Board Close-Up
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