Tektronix WFM 601M User Manual

Reference

WFM 601A, WFM 601E & WFM 601M User Manual

The waveform monitor provides an internal etched graticule for waveform
measurements. The internal graticule scales are on the same plane as the CRT
phosphor to reduce parallax errors. You can adjust the graticule and trace
illumination in the CRT menu for viewing or photographing the display.
Figure 3–25 shows the etched graticule.

0 V horizontal reference

Center line for 75% and 100%

color diff signals

Upper limit for 75% color diff signals

Lower limit for 75% color diff signals

mV scale

This etched scale facilitates direct Waveform and Parade measurements. The
vertical scale is marked in millivolts (mV) and extends from –300 mV to
+800 mV in 100 mV increments.

There are three dashed lines on the graticule used to measure the color difference
signals, Pb and Pr. The line at 50% amplitude is the center line for the color
difference signal measurements. The lines at 90 mV and 610 mV correspond to
the peak excursions for 75% color difference signals. 100% color difference
signals extend from the baseline (0 V) to 700 mV, centered on the 50% graticule
line.