GB611333A - Vacuum tube voltmeter - Google Patents

Vacuum tube voltmeter

Info

Publication number
GB611333A
GB611333A GB12706/46A GB1270646A GB611333A GB 611333 A GB611333 A GB 611333A GB 12706/46 A GB12706/46 A GB 12706/46A GB 1270646 A GB1270646 A GB 1270646A GB 611333 A GB611333 A GB 611333A
Authority
GB
United Kingdom
Prior art keywords
valve
grid
anode
meter
measured
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
Application number
GB12706/46A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB611333A publication Critical patent/GB611333A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01R15/005—Circuits for altering the indicating characteristic, e.g. making it non-linear
    • 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)
  • Nonlinear Science (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

611,333. Thermionic valve voltmeters. STANDARD TELEPHONES & CABLES, Ltd. April 26, 1946, No. 12706. Convention date, May 2, 1945. [Class 37] A D.C. voltage to be measured is applied to the grid 16 of a D.C. amplifier 18 whose anode is connected over resistance 25 and a meter 5 with a linear scale to a source 14 which is low compared with the normal anode potential for the valve 18, so that the valve has a substantially logarithmic response characteristic, and the valve is biassed beyond cut-off by potentiometer 23 to adjust the zero of the meter. Preferably the grid of valve 18 is fed from a cathode follower valve 8, 7, 13 whose grid is supplied from the source (which may be low A.C.) to be measured. By varying resistance 25 (or the anode voltage) the slope of the characteristic can be varied, and sensitivity can be adjusted by varying the tap 15 on resistances 9 and 10.
GB12706/46A 1945-05-02 1946-04-26 Vacuum tube voltmeter Expired GB611333A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US611333XA 1945-05-02 1945-05-02

Publications (1)

Publication Number Publication Date
GB611333A true GB611333A (en) 1948-10-28

Family

ID=22033804

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12706/46A Expired GB611333A (en) 1945-05-02 1946-04-26 Vacuum tube voltmeter

Country Status (2)

Country Link
BE (1) BE611333A (en)
GB (1) GB611333A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005072026A1 (en) * 2004-01-20 2005-08-04 Koninklijke Philips Electronics, N.V. Electronic ballast with multi-slope current feedback

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005072026A1 (en) * 2004-01-20 2005-08-04 Koninklijke Philips Electronics, N.V. Electronic ballast with multi-slope current feedback

Also Published As

Publication number Publication date
BE611333A (en) 1962-03-30

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