GB407458A - Improvements in or relating to valve voltmeters - Google Patents

Improvements in or relating to valve voltmeters

Info

Publication number
GB407458A
GB407458A GB3216132A GB3216132A GB407458A GB 407458 A GB407458 A GB 407458A GB 3216132 A GB3216132 A GB 3216132A GB 3216132 A GB3216132 A GB 3216132A GB 407458 A GB407458 A GB 407458A
Authority
GB
United Kingdom
Prior art keywords
resistance
anode
switch
screens
switches
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
GB3216132A
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.)
General Electric Co PLC
Original Assignee
General Electric Co 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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3216132A priority Critical patent/GB407458A/en
Publication of GB407458A publication Critical patent/GB407458A/en
Expired legal-status Critical Current

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
    • G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
    • G01R19/0076—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00 using thermionic valves
    • 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
    • G01R15/08—Circuits for altering the measuring range

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
  • Hybrid Cells (AREA)

Abstract

407,458. Current and pressure meters; transformers. GENERAL ELECTRIC CO., Ltd., Magnet House, Kingsway, London, BLIGH, N. R., and SMYTH, C. N., c /o General Electric Co., Wembley, Middlesex. Nov. 14, 1932, No. 32161. [Class 37.] An anode-bend thermionic valve voltmeter is provided with a ganged pair of switches 3 for range-changing so that the anode voltage and grid bias are altered concurrently. Preferably the switches are of rotary form and their operation slightly staggered so that resistance values are inincreased before voltage increases. A switch 5 operating a compensating resistance 4 for zero anode current adjustment may be ganged with the switch gang 3. The grid lead 2 is brought out free from the remaining leads and a decoupling resistance 6 is provided, together with an earthing switch 9. A battery eliminator for supplying the voltmeter has one or two screens between the primary and secondary windings one of the screens 7<2> being earthed and the other 7<3> being connected to the mid-point of the high voltage winding. If one screen is employed, a small condenser may be provided to equalize any difference of capacity between the capacities of the winding halves to the screen. A barretter, or a hand adjustment resistance 7<4>, is provided for maintaining the supply volts constant and a gas discharge tube V for keeping the eliminator output volts constant. Separate cases for the transformer, rectifying valves and smoothing circuits, and for the instrument circuits may be interconnected by screened leads.
GB3216132A 1932-11-14 1932-11-14 Improvements in or relating to valve voltmeters Expired GB407458A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3216132A GB407458A (en) 1932-11-14 1932-11-14 Improvements in or relating to valve voltmeters

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3216132A GB407458A (en) 1932-11-14 1932-11-14 Improvements in or relating to valve voltmeters

Publications (1)

Publication Number Publication Date
GB407458A true GB407458A (en) 1934-03-22

Family

ID=10334238

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3216132A Expired GB407458A (en) 1932-11-14 1932-11-14 Improvements in or relating to valve voltmeters

Country Status (1)

Country Link
GB (1) GB407458A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736861A (en) * 1951-08-24 1956-02-28 Jr Philip A Duffy Multirange direct current meter amplifier

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736861A (en) * 1951-08-24 1956-02-28 Jr Philip A Duffy Multirange direct current meter amplifier

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