Viewing your tape through an underscanned monitor gives you the opportunity to adjust the VCR or add additional video processing or time base correction equipment to remove this artifact. Other esoteric electronic details such as video head crossover noise, etc. can be viewed in the underscanned mode. Technicians would use this information to correct VCR playback anomalies. Cross pulse monitors also brighten the image making the dark sync pulse lighter and easier to examine. As before, a technician could diagnose video problems from aberrations in the sync pulse.
Professionals take special care to assure that the sync signal is straight, stable, and accurate.
HI Z if you are sending the signal through the monitor to another device, and 75 ohm if the monitor is the last device in the line to receive the signal. Speaker - Although TV monitors are used mostly to display video, there are times when you need to hear audio, for instance, when viewing a video tape. An internal speaker saves you the hassle of finding an amplifier and speaker for your sound. Blue gun - A TV monitor with a blue gun allows you to shut off all of the colors except blue. This is useful for calibrating the colors on the screen.