GB889328A - Apparatus for measuring small direct voltages - Google Patents

Apparatus for measuring small direct voltages

Info

Publication number
GB889328A
GB889328A GB14145/58A GB1414558A GB889328A GB 889328 A GB889328 A GB 889328A GB 14145/58 A GB14145/58 A GB 14145/58A GB 1414558 A GB1414558 A GB 1414558A GB 889328 A GB889328 A GB 889328A
Authority
GB
United Kingdom
Prior art keywords
voltage
predetermined value
source
compensating
measuring
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
GB14145/58A
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.)
NL INSTR ELECTRISCHE APP N FAB
Original Assignee
NL INSTR ELECTRISCHE APP N FAB
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 NL INSTR ELECTRISCHE APP N FAB filed Critical NL INSTR ELECTRISCHE APP N FAB
Publication of GB889328A publication Critical patent/GB889328A/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
    • G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only

Abstract

889,328. Voltage measuring. NEDERLANDSCHE INSTRUMENTEN-EN ELECTRISCHE APPARATEN FABRIEK N.V. May 2, 1958 [May 6, 1957], No. 14145/58. Class 37. In apparatus for measuring the voltage of a source T having a large internal resistance, such as a thermocouple, a millivoltmeter M is connected across the source, and a compensating voltage of the same polarity as the source is connected through resistor R to the meter M, a potentiometer P enabling this voltage to be adjusted to a predetermined value, the adjustment being made with T disconnected from M. The magnitude of the compensating voltage, when T is connected to M, will be less than the predetermined value owing to an increase in the volts drop across resistor R arriving from the current flow through T from the compensating source. When the voltage developed by T increases to the predetermined value, no current flows through T from the compensating supply, and the compensating voltage applied to M rises to the predetermined value, the volts drop across R decreasing accordingly. The meter M thus indicates when the source voltage reaches a predetermined value, this indication being unaffected by the high internal resistance of T. An adjustable contact O set to the predetermined value of the voltage may be provided, whereby when the source voltage reaches this value, a contact on the pointer W engages O for signalling or regulating purposes.
GB14145/58A 1957-05-06 1958-05-02 Apparatus for measuring small direct voltages Expired GB889328A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL889328X 1957-05-06

Publications (1)

Publication Number Publication Date
GB889328A true GB889328A (en) 1962-02-14

Family

ID=19853872

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14145/58A Expired GB889328A (en) 1957-05-06 1958-05-02 Apparatus for measuring small direct voltages

Country Status (1)

Country Link
GB (1) GB889328A (en)

Similar Documents

Publication Publication Date Title
GB1359049A (en) Bridgetype condition sensing circuits
GB1451231A (en) Gas sensitive devices
GB1214266A (en) A method and apparatus for measurement by determining the temperature of a thermosensitive element heated by the joule effect
GB902087A (en) Improvements in or relating to electrical bridge networks
GB668453A (en) Multi-channel telemetering device
GB889328A (en) Apparatus for measuring small direct voltages
GB1456646A (en) Measuring-transducer circuits
GB972408A (en) Improvements in or relating to a device for measuring the electrical conductance or resistance of molten glass
GB900329A (en) Systems for measuring electrolytic conductivity of a liquid
GB1104719A (en) The maintenance of a desired mean temperature in a length of material
GB999476A (en) Improvements in or relating to electric frequency measuring devices
GB835551A (en) Improvements in and relating to temperature measuring devices
GB970370A (en) Alternating current bridge circuit
GB1487670A (en) Measuring bridge
GB1351472A (en) Electrical apparatus for measuring compensated temperature variations
GB969055A (en) Improvements in or relating to fault detection in moving-coil electric instrument circuits
GB1155946A (en) A Direct Voltage Measuring Potentiometer Free of Thermoelectric Voltage.
SU143466A1 (en) Device for measuring active resistances
SE336976B (en)
GB1193821A (en) Improvements in or relating to Electrically Suppressed-Zero Measuring Arrangements
GB1114132A (en) Ht voltage measurement
GB790631A (en) Improvements in or relating to thermocouple instruments
GB971894A (en) Improvements in electrical instruments for the measurement of physical quantities
GB1064174A (en) Device for measuring the concentration of salt in a liquid
GB1204151A (en) Device for the accurate measurement of temperature