GB574830A - Vacuum tube voltmeter circuits - Google Patents
Vacuum tube voltmeter circuitsInfo
- Publication number
- GB574830A GB574830A GB7408/44A GB740844A GB574830A GB 574830 A GB574830 A GB 574830A GB 7408/44 A GB7408/44 A GB 7408/44A GB 740844 A GB740844 A GB 740844A GB 574830 A GB574830 A GB 574830A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cathode
- resistance
- diode
- terminal
- contact
- 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
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0023—Measuring currents or voltages from sources with high internal resistance by means of measuring circuits with high input impedance, e.g. OP-amplifiers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
574,830. Thermionic valve voltmeters. STANDARD TELEPHONES & CABLES, Ltd. April 21, 1944, No. 7408. Convention date, April 24, 1943. [Class 37] A valve voltmeter is arranged for measuring either direct or alternating voltages. The voltage to be measured is applied between earth and an input terminal 1 connected to the grid 2 of a valve 3. The plate 5 is connected to a D.C. source 8A the negative terminal of which is earthed. The cathode 6 is connected through a resistance 7 to another D.C. source 8B having its positive terminal earthed. A resistance 10 is connected between a slider 30 on the resistance 7 and one contact 11 of a two-way switch 12, the arm of which is connected to earth through a microammeter M. The cathode 6 is also connected through a blocking condenser 14 to the plate 16 of a diode 17, the cathode 18 of which is connected to a contact 28 of a switch 27, gauged with the switch 12, and also to the plate 20 of a second diode 21. The cathode 22 of the diode 21 is connected through a resistance 23 to the second contact 25 of the switch 12 and also through a resistance 26 to the plate 16 of the diode 17. For measuring a direct voltage the switches 12, 27 are moved to the left-hand position, so that the microammeter M is connected to the slider 30, which is so adjusted that the microammeter reads zero when no voltage is applied to the terminal 1. When a positive potential is applied to the terminal 1 an increase of cathode current occurs and a corresponding reading is given. For measuring an alternating voltage the switch arms are moved to the right connecting the micro ammeter M to the contact 25 and earthing the contact 28. When an alternating voltage is applied to the terminal 1, a corresponding alternating voltage appears at the cathode 6 and is applied through the condenser 14 to the plate 16 of the diode 17. The rectified current passes through the resistance 26 and microammeter M and gives a corresponding reading. In the absence of an applied alternating voltage the emission currents of the diodes 17, 21 cancel out and produce no reading. Any unidirectional component of the alternating voltage is removed by the blocking condenser 14.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US574830XA | 1943-04-24 | 1943-04-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB574830A true GB574830A (en) | 1946-01-22 |
Family
ID=22010836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7408/44A Expired GB574830A (en) | 1943-04-24 | 1944-04-21 | Vacuum tube voltmeter circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB574830A (en) |
-
1944
- 1944-04-21 GB GB7408/44A patent/GB574830A/en not_active Expired
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