Automatic measurement of cathode ray tube Modular Transfer Functions
Abstract
A semiautomatic facility which directly plots the dynamic modulation transfer function is described. A sine wave pattern is generated which moves at a chosen rate across the screen using a variable frequency oscillator (VFO). The intensity of the spatial pattern is measured by a stationary optical detector consisting of a Ferranti Microspot analyzer, photomultiplier peak detector and hold circuits. To provide automatic operation, the ramp output from the chart recorder (which is proportional to the X deflection) is fed via an interface circuit into the voltage controlled oscillator input of the VFO. The spatial frequency displayed by the CRT is therefore linearly related to the X deflection of the chart recorder. The potential of pulse output signal processing for determining the ultimate performance capability of CRT'S is discussed. Circuit diagrams are given and circuit operations are described.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- August 1980
- Bibcode:
- 1980STIN...8221530A
- Keywords:
-
- Automatic Test Equipment;
- Cathode Ray Tubes;
- Transfer Functions;
- Circuit Diagrams;
- Photomultiplier Tubes;
- Signal Processing;
- Electronics and Electrical Engineering