GB1365757A - Apparatus for measuring admittance values - Google Patents

Apparatus for measuring admittance values

Info

Publication number
GB1365757A
GB1365757A GB1701972A GB1701972A GB1365757A GB 1365757 A GB1365757 A GB 1365757A GB 1701972 A GB1701972 A GB 1701972A GB 1701972 A GB1701972 A GB 1701972A GB 1365757 A GB1365757 A GB 1365757A
Authority
GB
United Kingdom
Prior art keywords
admittance
source
measuring
hence
transistor
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
GB1701972A
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.)
Marconi Instruments Ltd
Original Assignee
Marconi Instruments Ltd
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 Marconi Instruments Ltd filed Critical Marconi Instruments Ltd
Priority to GB1701972A priority Critical patent/GB1365757A/en
Publication of GB1365757A publication Critical patent/GB1365757A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Resistance Or Impedance (AREA)

Abstract

1365757 Measuring admittance MARCONI INSTRUMENTS Ltd 27 Feb 1973 [13 April 1972] 17019/72 Heading G1U The admittance of an element connected between two terminals 1, 2 is measured by passing a small current from a low impedance A. C. source 3 through it and through the base-emitter circuit of a transistor 6 having a collector load comprising a circuit 11 tuned to the frequency of the A. C. source and a selectable shunt resistor 12, 13, 14, and by measuring 18 the base-collector voltage, which will be an indication of the current through the unknown element and hence of its admittance. The selectable resistors 12, 13, 14 provide three different gains for the transistor, and hence three different measurement ranges. The frequency of the A.C. source may be switched, also, to a lower value, in which case the collector load 11 is retuned by shunt capacitor 17. Since the A. C. source has a low impedance, the arrangement may also be used for measuring the admittance of an element even when it is shunted by a parallel path, providing that an intermediate point in the parallel path is connected to earth 14.
GB1701972A 1973-02-27 1973-02-27 Apparatus for measuring admittance values Expired GB1365757A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1701972A GB1365757A (en) 1973-02-27 1973-02-27 Apparatus for measuring admittance values

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1701972A GB1365757A (en) 1973-02-27 1973-02-27 Apparatus for measuring admittance values

Publications (1)

Publication Number Publication Date
GB1365757A true GB1365757A (en) 1974-09-04

Family

ID=10087761

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1701972A Expired GB1365757A (en) 1973-02-27 1973-02-27 Apparatus for measuring admittance values

Country Status (1)

Country Link
GB (1) GB1365757A (en)

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee