GB658819A - Improvements in or relating to electrical measuring instruments - Google Patents
Improvements in or relating to electrical measuring instrumentsInfo
- Publication number
- GB658819A GB658819A GB853849A GB853849A GB658819A GB 658819 A GB658819 A GB 658819A GB 853849 A GB853849 A GB 853849A GB 853849 A GB853849 A GB 853849A GB 658819 A GB658819 A GB 658819A
- Authority
- GB
- United Kingdom
- Prior art keywords
- instrument
- pointer
- energized
- arm
- measuring instruments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
- G01R27/10—Measuring resistance by measuring both voltage and current using two-coil or crossed-coil instruments forming quotient
- G01R27/12—Measuring resistance by measuring both voltage and current using two-coil or crossed-coil instruments forming quotient using hand generators, e.g. meggers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Unknown Time Intervals (AREA)
Abstract
658,819. Electric measuring instruments. SANGAMO WESTON LTD. March 29, 1949, No. 8538. [Class 37] An instrument, such as a moving coil ratiometer, that has little or no restoring force, has its pointer brought back to a datum point by a spring or gravity actuated member adapted to engage with and move the pointer back to datum position when the instrument is deenergized, and which is moved in the reverse direction when the instrument is energized so as to free the pointer. As shown, when the instrument is energized, windings 25 are energized to attract pivoted armature 35 against the action of a spring 36 and thus rotate arm 37 carrying a ratchet 38 engaging and thus rotating gear 40 to swing arm 44 over to the right, thus freeing the pointer a for movement ; when the instrument is deenergized, armature 35 is released, and the arm 44 swings back, carrying pointer a with it. An auxiliary indicator 47 may give an on-off indication. Specification 567,435 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB853849A GB658819A (en) | 1949-03-29 | 1949-03-29 | Improvements in or relating to electrical measuring instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB853849A GB658819A (en) | 1949-03-29 | 1949-03-29 | Improvements in or relating to electrical measuring instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB658819A true GB658819A (en) | 1951-10-10 |
Family
ID=9854373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB853849A Expired GB658819A (en) | 1949-03-29 | 1949-03-29 | Improvements in or relating to electrical measuring instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB658819A (en) |
-
1949
- 1949-03-29 GB GB853849A patent/GB658819A/en not_active Expired
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