GB545999A - Improvements in or relating to electrical measuring apparatus - Google Patents

Improvements in or relating to electrical measuring apparatus

Info

Publication number
GB545999A
GB545999A GB1794640A GB1794640A GB545999A GB 545999 A GB545999 A GB 545999A GB 1794640 A GB1794640 A GB 1794640A GB 1794640 A GB1794640 A GB 1794640A GB 545999 A GB545999 A GB 545999A
Authority
GB
United Kingdom
Prior art keywords
battery
current
polarizing
circuit
meter
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
GB1794640A
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
Priority to GB1794640A priority Critical patent/GB545999A/en
Publication of GB545999A publication Critical patent/GB545999A/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
    • G01R19/22—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc
    • G01R19/225—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using conversion of ac into dc by means of thermocouples or other heat sensitive elements

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)

Abstract

545,999. Thermionic valves. STANDARD TELEPHONES & CABLES, Ltd., BARNARD, R. M., and KRAM, W. Dec. 20, 1940, No. 17946. [Class 39 (i)] [Also in Group XXXVI] In apparatus for measuring electric currents at high frequencies, the current to be measured is connected to terminals B connected to the ends of the filamentary cathode H of a cylindrical diode, a meter M in the form of a galvanometer micro ammeter being connected between the anode A and one end of the cathode H. The sensitivity of the device may be increased by applying a relatively small polarizing voltage, e.g. from a battery, between the anode A and the cathode. In another form, Fig. 3, the polarizing voltage is produced by a battery F whilst a battery F1 and rheostat R2 shunting the meter produces a current in the meter which opposes the electron current so that the deflection is zero when no signal is present at the input. A polarizing current is passed through the heater by a battery F2 and rheostat R1, the voltage to be measured being impressed on the cathode circuit via a condenser C. In a second form, Fig. 4, for measurement in a H.F. circuit the diode is constructed to simulate a short length of a coaxial transmission line, the polarizing current being passed through the heater from a battery F2 having a voltage sufficiently high to allow the resistance r to be larger than the characteristic impedance of the circuit, condensers C confining the polarizing current to the circuit. A battery F1 and resistance R2 are provided to balance the standing anode current. The relations between the inductance L and the capacitance C are given by the equation Zk being the characteristic impedance of the network, the polarizing current being adjusted to produce a space charge such that R the resistance of the heater per cm. length and G the conductance per cm. length. For the balanced case in the measurement of the H.F. circuit, the diode is provided with two cathodes H, H1, Fig. 5, constructed as parallel filaments connected to input and output circuits I, O through transformers T1, T2. The polarizing battery F2 is connected between the mid points of windings of the transformer, and the batteries F1, F, resistance R2 and meter M function as shown in Fig. 4. Specification 168,394, [Class 39 (i)], is referred to.
GB1794640A 1940-12-20 1940-12-20 Improvements in or relating to electrical measuring apparatus Expired GB545999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1794640A GB545999A (en) 1940-12-20 1940-12-20 Improvements in or relating to electrical measuring apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1794640A GB545999A (en) 1940-12-20 1940-12-20 Improvements in or relating to electrical measuring apparatus

Publications (1)

Publication Number Publication Date
GB545999A true GB545999A (en) 1942-06-23

Family

ID=10104003

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1794640A Expired GB545999A (en) 1940-12-20 1940-12-20 Improvements in or relating to electrical measuring apparatus

Country Status (1)

Country Link
GB (1) GB545999A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2575996A (en) * 1949-10-12 1951-11-20 Sorensen & Company Inc Expanded scale root mean square type voltmeter
US2584272A (en) * 1946-07-12 1952-02-05 Rca Corp Radio-frequency bolometer wattmeter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2584272A (en) * 1946-07-12 1952-02-05 Rca Corp Radio-frequency bolometer wattmeter
US2575996A (en) * 1949-10-12 1951-11-20 Sorensen & Company Inc Expanded scale root mean square type voltmeter

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