GB612137A - Improvements in or relating to valve voltmeters - Google Patents
Improvements in or relating to valve voltmetersInfo
- Publication number
- GB612137A GB612137A GB14021/46A GB1402146A GB612137A GB 612137 A GB612137 A GB 612137A GB 14021/46 A GB14021/46 A GB 14021/46A GB 1402146 A GB1402146 A GB 1402146A GB 612137 A GB612137 A GB 612137A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistance
- valve
- condenser
- voltage
- bias
- 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
- G01R17/00—Measuring arrangements involving comparison with a reference value, e.g. bridge
- G01R17/10—AC or DC measuring bridges
- G01R17/16—AC or DC measuring bridges with discharge tubes or semiconductor devices in one or more arms of the bridge, e.g. voltmeter using a difference amplifier
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
612,137. Thermionic valve voltmeters. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. May 9, 1946, No. 14021. Convention date, Feb. 25, 1942. [Class 37] In a valve voltmeter of the type in which the voltage to be measured is applied to the input circuit 8 of an anode bend detector 4 which includes a bias resistance 6 shunted by a condenser 5, a high resistance 10 is connected in series with condenser 5, so as to avoid the initial excessive grid current produced by a large A.C. input, the voltage drop across resistance 10 due to the transient charging current of condenser 5 counteracting the high periodic positive potential applied to the grid. Preferably, the bias produced by resistance 6 is opposed by a voltage tapped from resistance 3. The resistance 10 may be short-circuited and a short circuit removed from the meter 7 before reading by a switch 12 which may be operated by a relay in the anode circuit of the valve 4.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL612137X | 1942-02-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB612137A true GB612137A (en) | 1948-11-09 |
Family
ID=19788135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB14021/46A Expired GB612137A (en) | 1942-02-25 | 1946-05-09 | Improvements in or relating to valve voltmeters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB612137A (en) |
-
1946
- 1946-05-09 GB GB14021/46A patent/GB612137A/en not_active Expired
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