A New Logarithmic Photometer: Test Results
A commonly used logarithmic photometer chassis employs 4 cut-in diodes to convert the quasilogarithmic function to a true logarithmic function. With 4 cut-in diodes this conversion can only be completely accomplished at 5 points in the complete dynamic range. A technique was developed allowing conversion of quasilogarithmic data to true logarithmic form to 21 points over the dynamic range. The circuitry described is applicable to multiple phototubes and photographic photometry. (Author).
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accuracy adjusted alsº associated basic calibrate circuit Complete Contract NObs-72039 March correction signal correction voltages curve cycles derived described desired deviation diode dynode voltage Ensminger Contract NObs-72039 F º Figure gave go sº illustrated incorporated introduced iſ sº light flux limiting resistor linear Logarithmic Photometer System low-voltage March 1961 Task Modifications MULTIPLIER PHOTOTUBE CONTROL º º º º ºf º Sº º t º º wº ºf rº ºts phototube control unit points portion power supply present previous report range recorder response RESULTS Richard L Ş º setting sº tº straight line Superimposed TAPPED POTENTIOMETER Task 6 Report TEST RESULTS Richard Twenty viºlao windº zoº'Asa