Table of Contents
Advertisement
COLOR BURST level: Testing the color burst level will determine if the burst signal is sufficient to trigger the
displays color producing circuit. Burst will diminish in amplitude over longer cable runs and can get fall below
the threshold for the video display to show a color image.
For NTSC format, the Chroma standard level is 40 IRE
For PAL format, the Chroma standard level is 280mV
If the Chroma level is too low, the color will not be as deep, and some details of the image will become lighter.
If the Chroma level is too high, there will be distortions on the image. If the coaxial cable is too long, it will
reduce the Chroma level.
Image loop test: Test video optical transmitter and receiver and video cable, connect one end to the tester
"VIDEO OUT" port ,and the other end connected to "VIDEO IN" port, the signal send via "VIDEO OUT"
port ,and received via "VIDEO IN" port , If the testing is ok, the tester displays several gradually dwindling
photos on the desktop.
3.3.11 Color-bar generator (TV OUT)
Click
to enter, the tester sends the color bars from the "Video out" port, Click the icon "PAL", select
"PAL/NTSC" output formats.
Click the selected color-bars, testing image or single bar (red, green, blue, white or black). Double click to full
- 41 -
Advertisement
Table of Contents
