This gauge works on the principle of optical reconvergence, measuring the amount of reconvergence necessary to define the convergence error present. Misconvergence displays itself as white areas or lines that have a tinge of RGB. The Klein model CM7AG gauge contains three prisms, each passes one of the phosphor colors of the CRT. The stationary center prism is a reference; the outer two prisms shift. Rotating the outer prism makes the image beneath it appear to shift. The amount of shift is calibrated in millimeters. The gauge scales read the convergence error present when the three colors of the image shift into optical reconvergence.
TEKTRONIX J17 LUMACOLOR PHOTOMETER AND SEN
SOR HEAD
The J17 is a hand-held digital photometer, radiometer, and colorimeter. The backlit unit features auto-ranging, auto-zero, readings in English or metric units, and an RS-232D interface. The J17 supports the fully interchangeable J1800 series of heads that provide the ability to make a variety of light measurements. We used the J1820 chromaticity head for taking chromaticity measurements of displays, ambient-lighting measurements, and light-source measurements. Luminance values are initially displayed in cd/m2 but can be converted to foot-lamberts with the press of a button.
BYTE Digest editors every month analyze and evaluate the best articles from Information Week, EE Times, Dr. Dobb's Journal, Network Computing, Sys Admin,
and dozens of other CMP publications—bringing
you critical news and information about wireless communication,
computer security, software development, embedded systems,
and more!
Testing Tools
