Extron Electronics DA 6V EQ - Manual (Page 18)

DA AV EQ Series • Front Panel Features and Operation
Front Panel Features and Operation, cont’d
DA AV EQ Series
A
Appendix A
Specifications, Parts, and
Accessories
Specifications
Models
Included Parts
Optional Accessories
Cables
3-6
Adjusting for long cables
If you are using long cables, you need to adjust the Gain and EQ
potentiometers (pots) until you have the best picture quality.
Using an oscilloscope is recommended; however, you can make
these adjustments without one. Both methods are described
below.
Adjusting with an oscilloscope
1. Feed a grayscale signal from an Extron VTG 300/400 or
other A/V test generator to the input of the DA AV EQ.
2. Remove the far end of the output cable from the display,
and connect it to the oscilloscope with 75 ohm termination.
3. Adjust the composite video or Y Gain pot to achieve
0.7 Vp-p for the white bar of the test pattern. For the
S-video models, adjust the C gain pot to achieve 0.3 Vp-p
of color burst level.
4. Adjust the EQ pot until no overshooting or round corners
appear on the test pattern.
5. Repeat steps 1 through 4 for all other output pairs.
6 . Plug the far end of the cable back into the display device.
Adjusting without an oscilloscope
1. Feed a grayscale signal from an Extron VTG 300/400 or
other A/V test generator to the input of the DA AV EQ.
2. Adjust the composite video or Y Gain pot until the picture
from the display device appears to have the correct
brightness and contrast.
3. Adjust the EQ pot until the picture appears sharp and
without visible smearing.
4 . Repeat steps 1 through 3 for all other output pairs.