1863: Difference between revisions
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(Created page with "Type '''1863 Megohmeter'''. ==Specifications== ==Links== ==Photos== <gallery> </gallery> Category:Meters") |
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Type | {{GR Product | ||
|model=1863 | |||
|codes=1863-9700, 1863-9701 | |||
|class= | |||
|summary=Megohmmeter | |||
|image=GR-1863-1.jpg | |||
|caption=General Radio 1863 Megohmmeter | |||
|series= | |||
|introduced=1970 | |||
|discontinued=current | |||
|designers= | |||
|manuals= | |||
* [[Media:GR 1863 and 1864 Instruction Manual 1863-0100-00.pdf|GR 1863 and 1864 Instruction Manual (1863-0100-00)]] | |||
* [[Media:GR 1863 and 1864 Instruction Manual 1863-0100-C 1974-08.pdf|GR 1863 and 1864 Instruction Manual (1863-0100-C, 1974)]] (readable schematics) | |||
* [https://www.ietlabs.com/pdf/Manuals/1863-64_im.pdf GR1863/1864 Instruction Manual, Aug 2018] @ IET Labs | |||
{{Catalog History}} | |||
}} | |||
The {{Title|GR Type 1863 Megohmmeter}} was introduced in {{Catalog U}}. It is still [https://www.ietlabs.com/genrad-1863-megohmmeter.html available from IET Labs] as of 2024. | |||
==Specifications== | ==Specifications== | ||
* '''Test Voltage:''' 50, 100, 100, 250, or 500 V; 5 mA limit | |||
* '''Resistance Range:''' 50 kΩ 20 20 TΩ in 7 ranges | |||
==Links== | ==Links== | ||
* The Model [[1864]] is similar but with a 200 TΩ top range, and test voltage variable from 10 V to 1090 V. | |||
==Internals== | |||
The 1863 is solid-state except for the test voltage supply pass element, a 6AB4 (EC92) vacuum tube. | |||
Current through the unknown is converted to a voltage using decade reference resistors from 2 kΩ to 200 MΩ. | |||
In the highest range (1 TΩ multiplier), feedback is used to multiply the effective reference resistance by a factor of 10. | |||
A four-stage, FET-input amplifier drives an analog meter. | |||
==Photos== | ==Photos== | ||
<gallery> | <gallery> | ||
GR-1863-1.jpg | |||
GR-1863-2.jpg | |||
GR-1863-3.jpg | |||
</gallery> | </gallery> | ||
[[Category:Meters]] | [[Category:Meters]] | ||
__NOTOC__ | |||
Revision as of 04:58, 20 April 2024
The GR Type 1863 Megohmmeter was introduced in Catalog U (1970). It is still available from IET Labs as of 2024.
Specifications
- Test Voltage: 50, 100, 100, 250, or 500 V; 5 mA limit
- Resistance Range: 50 kΩ 20 20 TΩ in 7 ranges
Links
- The Model 1864 is similar but with a 200 TΩ top range, and test voltage variable from 10 V to 1090 V.
Internals
The 1863 is solid-state except for the test voltage supply pass element, a 6AB4 (EC92) vacuum tube.
Current through the unknown is converted to a voltage using decade reference resistors from 2 kΩ to 200 MΩ. In the highest range (1 TΩ multiplier), feedback is used to multiply the effective reference resistance by a factor of 10.
A four-stage, FET-input amplifier drives an analog meter.
