GB794706A - Radio frequency microwattmeter - Google Patents
Radio frequency microwattmeterInfo
- Publication number
- GB794706A GB794706A GB31875/56A GB3187556A GB794706A GB 794706 A GB794706 A GB 794706A GB 31875/56 A GB31875/56 A GB 31875/56A GB 3187556 A GB3187556 A GB 3187556A GB 794706 A GB794706 A GB 794706A
- Authority
- GB
- United Kingdom
- Prior art keywords
- bridge
- radio frequency
- balanced
- thermistor
- value
- 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
- G01R21/00—Arrangements for measuring electric power or power factor
Abstract
794,706. Microwattmeters. STANDARD TELEPHONES & CABLES, Ltd. Oct. 19, 1956 [Oct. 21, 1955], No. 31875/56. Class 37. A radio frequency microwattmeter consists of three equal resistances 1, 2 and 3, each of value R and a suitable thermistor 4 which together form a bridge with a balance indicator 8. The bridge is supplied with current from a source 5 through a series resistor R<SP>1</SP>. R<SP>1</SP> is varied until the bridge is balanced. The mean value of R<SP>1</SP> needed to balance the bridge should be very nearly equal to R. This can be achieved by choosing the thermistor and value of the source correctly. When the bridge is balanced a radio frequency input is applied across the thermistor at 9 and 10. A shunt circuit across the bridge consisting of variable resistance r and ammeter 6 is closed by means of switch 7. The resistor r is then adjusted until the bridge is once more balanced. The current through 6 is then an indication of the power to be measured. The Specification claims 5 per cent accuracy over a wide range of ambient temperature using only a low voltage source such as can easily be supplied by batteries.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU794706X | 1955-10-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB794706A true GB794706A (en) | 1958-05-07 |
Family
ID=3759065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB31875/56A Expired GB794706A (en) | 1955-10-21 | 1956-10-19 | Radio frequency microwattmeter |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB794706A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2263784A (en) * | 1990-01-09 | 1993-08-04 | Richard George Vivian Doble | High frequency voltage/current-measuring circuit |
-
1956
- 1956-10-19 GB GB31875/56A patent/GB794706A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2263784A (en) * | 1990-01-09 | 1993-08-04 | Richard George Vivian Doble | High frequency voltage/current-measuring circuit |
| GB2263784B (en) * | 1990-01-09 | 1994-02-16 | Richard George Vivian Doble | High frequency measuring circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB833351A (en) | ||
| GB998413A (en) | Improvements in variable impedance devices | |
| GB664898A (en) | Improvements in or relating to bridge devices and circuits for use at radio and higher frequencies | |
| GB794706A (en) | Radio frequency microwattmeter | |
| JPS57203967A (en) | Digital meter of voltage, current and phase defference | |
| GB675030A (en) | Apparatus for the measurement, and comparison, of the conductivity of solutions | |
| GB621041A (en) | Improvements in or relating to automatic electric control arrangements | |
| GB887587A (en) | Improvements relating to electrical resistance measuring instruments | |
| SU65123A1 (en) | Electrical measuring device | |
| GB810782A (en) | Improvements in or relating to electric time-delay circuits | |
| GB575443A (en) | Improvements in or relating to methods of detecting and/or locating by electrical means masses of electrically conducting or magnetic material | |
| GB691862A (en) | Improvements in or relating to electrical measuring instruments | |
| GB747828A (en) | Improvements in electric thermometers | |
| GB636048A (en) | Improvements in electrical measuring methods and apparatus | |
| JPS5745468A (en) | Pointer type resistance meter for electric blasting | |
| GB961303A (en) | Improvements in or relating to a bridge for measuring the electric conductivity of electrolytes | |
| GB830384A (en) | Improvements relating to protection of electrical instruments | |
| GB669462A (en) | Improvements in or relating to equipment for use with electrical resistence strain gauges | |
| GB639230A (en) | Improvements in and relating to alternating current bridge circuits | |
| GB631991A (en) | Improvements relating to electrical measuring instruments | |
| GB888919A (en) | Improvements in or relating to ph meters | |
| GB807232A (en) | Improvements in and relating to temperature measuring devices | |
| GB908165A (en) | Improvements relating to potentiometer circuits | |
| GB971894A (en) | Improvements in electrical instruments for the measurement of physical quantities | |
| GB792431A (en) | Improvements in or relating to direct coupled transistor amplifiers |