Functional Testing

DRC has designed and built a testing device for checking transmission variation in code discs.

D.C. Testing variation in transmission or "D.C. Swing" is defined as follows: The maximum variation in transmission measured at the radial center of the code pattern, and protected around the entire pattern (360 degrees) to be 3% - 10%. (The actual transmission specification assigned is a function of line count, diameter, customer requirements, and manufacturing technique i.e., photo-emulsion or Metrifilm.)

The output data is in graphic form and therefore becomes a permanent record to remain with the disc until final assembly.

The test is "standard procedure" for discs produced at Metrigraphics. A copy of the transmission graph can be included with each disc upon request.

The correlation of data gained in this test, and the performance of discs in customer applications has been found to be very high.