KELMAR ATD-1200 Manual
   |
Systems Inc., 284 Broadway, Huntington Station, NY 11746 • 631.421.1230 • FAX 631.421.1274ATD-1200 Dolby Digital/Analog Basement ReaderTest Setup with OscilloscopeThe following test setup will enable adjustment of focus and confirmation and adjustment of LED level and optical alignment.1. Make sure power to ATD-1200 power supply is provided, Power to the Digital Processor should also be turned on.2. Open the Digital Processor to gain access to the test points.3. Connect a probe from Channel 1 of a 20MHz or greater bandwidth oscilloscope to the VIDEO test point of the VideoAcquisition Card, with the ground lead to the VGND.4. Connect a second probe from the scope’s Channel 2 to the CLAMP signal test point to trigger the scope. Connect thesecond probes ground to DGND.5. Set the trigger source on the scope to Ch.2.6. Adjust the Ch.2 vertical trace position to move the trace off the screen. It is not necessary to view this signal oncetriggering has been established. Adjust the scope for 1 horizontal trace across the screen and adequate vertical gain(approx. 2 usecI div. horizontal, 1 V /div. vertical). With SRD film threaded and running in the projector, observe thevideo waveform. (see figure 1 in next section)-Focus AdjustmentThe ATD-1200 Readers are factory adjusted and should not require adjustment during installation. If the unit has becomemisadjusted focusing may be performed. Using the setup as above, adjust the lens/ CCD assembly in the reader byloosening the clamp screw located on the upper lens holder assembly, and move the lens assembly back and forth. The bestfocus is achieved when the scope pattern has minimum brightness in the center of the trace. There will always be some lighthere; one is looking for the most “focused looking” display, with minimum brightness inside the envelope. This shouldcorrelate with a minimum error rate. Re-tighten the lens clamping screw.figure 1Adjust for minimum brightness in center of image. |
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine