自動ドリフト補償検流計型微少電圧計

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書誌事項

タイトル別名
  • Automatic Drift Compensating Galvanometer Type Millimicrovoltmeter
  • ジドウ ドリフト ホショウケンリュウケイガタ ビショウ デンアツケイ

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A millimicrovoltmeter was devised to control the temperature in the range from 600°C to 1000°C using a thermocouple with high accuracy of 1/1000°C. Main system of the voltmeter is composed of a galvanometer and an electric resistance bridge of photoconductive elements (CdS). A phase lead type local feedback circuit from the bridge to the galvanometer serves to stabilize the gain of the voltmeter, to increase the critical damping resistance and also to somewhat decrease the response speed so as to make it less difficult to control the drift of the voltmeter. The drift control is made in the following manner. The unbalance voltage of the CdS bridge rotates a two phase motor which in turn moves the contact brush of a variable resistance on one arm of a separate dc bridge. Then, the unbalance voltage thus generated is divided into small portions and fed to the galvanometer. Another phase lead type compensator is used in the drift control circuit for stabilization of the control. Measurements made by this voltmeter used as an ordinary one and the drift control actions come alternatively. Measurements are repeated 100 to 800 times for each of six measuring points in the electric voltage range 1.5×10-9V-3×10-8V for the purpose of confirming the capability of the millimicrovoltmeter. The achieved capability is as follows; voltage sensitivity 1×10-9V, drift less than 4×10-10V/h, noise 7×10-10V, measurable range 1×10-9V-2.7×10-6V, 90% response time 4-13 sec, gain higher than 90 db and external critical damping resistance 25Ω-15Ω.

収録刊行物

  • 計測と制御

    計測と制御 2 (10), 759-769, 1963

    公益社団法人 計測自動制御学会

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