Scan Mode TV - very fast, very flaky. Turning on the operation switch with the Scan Mode in Rapid also gets the rapid scan mode going. Normal - slow scan, better image than Rapid. Micron Marker - turns the micron bar on and off. Used for making the brights dimmer and the darks brighter.
Contrast Controls the amplification of the photo multiplier tube.
Brightness Controls the level of the photo multiplier tube. Good for work at high mag. This assumes that a sample is loaded and the SEM is at operating vacuum. Make sure emission control is fully counter clockwise. Turn on operation switch.