The Tektronix VM100 and VM101 Video Measurement Sets are automatic video measurement instruments. The VM100 measures NTSC signals and the VM101 measures PAL signals. The video measurement sets use existing or inserted test signals and take measurements consistent with regulatory specifications. The video measurement sets display measurement results on a LCD screen. You can also display measurement results on a serial printer or remote PC using the RS-232 port. The video measurement sets perform the following measurements (on-screen labels are shown in parentheses): Differential Phase (DIFF PHASE) Differential Gain (DIFF GAIN) Chrominance-to-Luminance Delay (YC DELAY) Chrominance-to-Luminance Gain (YC GAIN) Signal-to-Noise Ratio (SNR WGT/FLAT) Frequency Response (FREQ FCC or AVG) Frequency Response Detail (FREQ FLAG, FREQ #1 through FREQ #6) or (FRQmax and FRQmin) Group Delay (GRPDLYmax and GRPDLYmin) Sync Amplitude (SYNC AMPL) Burst Amplitude (BURST AMPL) Bar Amplitude (BAR AMPL) 2T K-Factor (2T K-FACTOR) Luminance Nonlinearity (LUM NON-LIN) Hum (HUM P-P, 50/60 Hz, and 100/120 Hz)