The VM700A Video Measurement Set is a multi-function television test and measurement device with an easy to use interface. The VM700A performs the functions of a waveform monitor, vectorscope, automatic measurement set, and a noise measurement set on acquired television signals. Signals can be broadcast or from test equipment. The user may select numeric value displays to confirm signal path quality, or graphic displays for more detailed analysis. The VM700A can be operated directly using the front panel or remotely using one of the RS-232C ports on the rear panel. Automatic Video Measurements Auto mode makes standardized video measurements automatically, including those specified in the RS-250B/EIA-250C, NTC-7, and RS-170A video signal standards. These measurements can be compared with user-selectable limits. The VM700A generates a caution or alarm message if a measurement falls outside the selected limits. Reports can be formatted and printed at user-scheduled times. Digital Waveform/Vectorscope For detailed waveform analysis, you may display the actual signal and take additional measurements manually. In Waveform mode, cursors are available to aid in measuring time, frequency, and amplitude. These cursors allow precise location of 10, 50, and 90 percent points on any transition. You may expand the waveform display around any vertical or horizontal point. Since the data is digitized, the display remains bright at all expansion factors. The axes automatically expand with the waveform, so all units are correct as displayed. The Vector mode provides the normal vectorscope display. The vectors may be rotated or expanded, with the rotation angle and gain values displayed numerically on the screen. A unique “Find Colorbars” feature searches all video for colorbars and displays the vectors it finds. Select Line in both Waveform and Vector modes can be used to quickly specify any line for display or automatic measurement if the proper signal type is being measured. Graphic Displays of Measurements Measure mode provides graphic displays of measurements such as noise spectrum, group delay, and K-factor, for adjustment or closer analysis of the measurement. Most measurements can be made relative to a stored reference to minimize or eliminate signal source errors. Most measurements have averaging to reduce the effects of random noise. Picture Mode You may quickly verify the signal source using the picture mode display and select any line on the picture for viewing in the waveform or vector displays. User-Programmable Functions You can define a sequence of operations as a new function. For example, the measurements to be made on a transmitter demodulator video output could be identified with a function labeled DEMOD. A user would select this function to make all measurements and provide a printout. Hardcopy All information on screen may be printed on printer supporting PostScript1 or 24-pin Epson2 graphics via the standard RS-232C interface. Automatic measurement results can be printed on most ASCII printers using the same interface. Remote Operation The VM700A can be operated from a remote terminal via its RS-232C ports to monitor unattended transmission systems, or to put systems under computer control. White Phosphor CRT (Option 74) This option provides a display module with a white phosphor CRT instead of the standard green phosphor when a new instrument is ordered with Option 74 from the factory. All the display module adjustments are the same as those for the standard CRT. VM700A Controls and Connections This is a description of the VM700A front panel controls and rear panel connections. The VM700A can be operated directly using the front panel or remotely using one of the RS-232C ports on the rear panel. Front Panel Controls The front panel (shown in Figure 2-1) consists of a touch screen and a 20-button keypad with a control knob.