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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

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)

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