GB406360A - Improvements in or relating to electrical measuring instruments - Google Patents
Improvements in or relating to electrical measuring instrumentsInfo
- Publication number
- GB406360A GB406360A GB2387732A GB2387732A GB406360A GB 406360 A GB406360 A GB 406360A GB 2387732 A GB2387732 A GB 2387732A GB 2387732 A GB2387732 A GB 2387732A GB 406360 A GB406360 A GB 406360A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relays
- relating
- measuring instruments
- circuit
- electrical measuring
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/006—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage
- H02H11/007—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of too high or too low voltage involving automatic switching for adapting the protected apparatus to the supply voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/002—Switches for altering the measuring range or for multitesters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Monitoring And Testing Of Exchanges (AREA)
- Emergency Alarm Devices (AREA)
Abstract
406,360. Cut-outs protecting testing- instruments. STANDARD TELEPHONES & CABLES, Ltd., and TREVET, E. J., Connaught House, Aldwych, London. Aug. 26, 1932, No. 23877. [Class 37.] Measuring-apparatus comprises a multi. range meter M in circuit with a number of make-before-break relays R1-R3 operating at pre-determined current values to change the range of measurement, and an overload relay, which may be one of the relays R1-R3, for cutting the meter out of circuit. The overload relay may alternatively maintain current through one or more of the remaining relays, and it may operate an alarm signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2387732A GB406360A (en) | 1932-08-26 | 1932-08-26 | Improvements in or relating to electrical measuring instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2387732A GB406360A (en) | 1932-08-26 | 1932-08-26 | Improvements in or relating to electrical measuring instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB406360A true GB406360A (en) | 1934-02-26 |
Family
ID=10202757
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2387732A Expired GB406360A (en) | 1932-08-26 | 1932-08-26 | Improvements in or relating to electrical measuring instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB406360A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2425811A (en) * | 1942-06-05 | 1947-08-19 | Conn Ltd C G | Apparatus for measuring voltages |
US2517638A (en) * | 1946-05-08 | 1950-08-08 | John F Decker | Electrical circuits for test meters |
US2529729A (en) * | 1946-02-18 | 1950-11-14 | Roy M Hanson | Means for maintaining accuracy of precision ammeters |
US2530184A (en) * | 1944-01-19 | 1950-11-14 | Curtiss Wright Corp | Strain measuring instrument |
US2606943A (en) * | 1947-02-06 | 1952-08-12 | Eastern Ind Inc | Automatic range-shifting voltmeter |
US2658180A (en) * | 1950-04-10 | 1953-11-03 | Phillips Petroleum Co | Vacuum tube voltmeter |
US2913181A (en) * | 1956-02-09 | 1959-11-17 | Leeder Jacob | Electronic scaling apparatus in analog computers |
US3016488A (en) * | 1960-11-08 | 1962-01-09 | Rodale Electronics Inc | Automatic range selector |
-
1932
- 1932-08-26 GB GB2387732A patent/GB406360A/en not_active Expired
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2425811A (en) * | 1942-06-05 | 1947-08-19 | Conn Ltd C G | Apparatus for measuring voltages |
US2530184A (en) * | 1944-01-19 | 1950-11-14 | Curtiss Wright Corp | Strain measuring instrument |
US2529729A (en) * | 1946-02-18 | 1950-11-14 | Roy M Hanson | Means for maintaining accuracy of precision ammeters |
US2517638A (en) * | 1946-05-08 | 1950-08-08 | John F Decker | Electrical circuits for test meters |
US2606943A (en) * | 1947-02-06 | 1952-08-12 | Eastern Ind Inc | Automatic range-shifting voltmeter |
US2658180A (en) * | 1950-04-10 | 1953-11-03 | Phillips Petroleum Co | Vacuum tube voltmeter |
US2913181A (en) * | 1956-02-09 | 1959-11-17 | Leeder Jacob | Electronic scaling apparatus in analog computers |
US3016488A (en) * | 1960-11-08 | 1962-01-09 | Rodale Electronics Inc | Automatic range selector |
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