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Operating Instructions
3–6
1780R-Series Operator’s Manual
Knob
The Precision Measurement control (large knob) provides analog
precision adjustments associated with the REFERENCE SET, LINE
SELECT, PHASE, TIMING CURSOR, and VOLTAGE CURSOR
switches, or as assigned by menu selections.
The current function of this knob is circled on the CRT screen.
< > Switches
The < > switches provide single-step increments. The readout
increments are the same as those for the Precision Measurement
Control readout. Push and release for an individual increment, or
push and hold to continue increments.
Graticules
This section describes the basic vector and waveform graticule
markings for both the 1780R (NTSC), and 1781R (PAL) instruments.
Scale Illumination for Vector and Waveform Graticules
The choice of internal or external graticule illumination is provided
on page 2 of the Configure menu. Refer to the Configure menu
instructions in this section. To adjust scale illumination, push the
button under the vectorscope or waveform CRT (to assign CRT
controls to vectorscope or waveform), then adjust the SCALE
control as desired.
Using The Vector Graticule
Basic Vector Graticule Markings. The NTSC Vector graticule is shown
in Figure 3–3. The polar display permits measurements of hue in
terms of the relative phase of the chrominance signal with respect to
the color burst. Relative amplitude of chrominance to burst is
expressed in terms of the displacement from center (radial dimension
of amplitude) towards the color point which corresponds to 75% (or
100%) amplitude for the color being measured.
Operating Instructions
3–6
1780R-Series Operator’s Manual
Knob
The Precision Measurement control (large knob) provides analog
precision adjustments associated with the REFERENCE SET, LINE
SELECT, PHASE, TIMING CURSOR, and VOLTAGE CURSOR
switches, or as assigned by menu selections.
The current function of this knob is circled on the CRT screen.
< > Switches
The < > switches provide single-step increments. The readout
increments are the same as those for the Precision Measurement
Control readout. Push and release for an individual increment, or
push and hold to continue increments.
Graticules
This section describes the basic vector and waveform graticule
markings for both the 1780R (NTSC), and 1781R (PAL) instruments.
Scale Illumination for Vector and Waveform Graticules
The choice of internal or external graticule illumination is provided
on page 2 of the Configure menu. Refer to the Configure menu
instructions in this section. To adjust scale illumination, push the
button under the vectorscope or waveform CRT (to assign CRT
controls to vectorscope or waveform), then adjust the SCALE
control as desired.
Using The Vector Graticule
Basic Vector Graticule Markings. The NTSC Vector graticule is shown
in Figure 3–3. The polar display permits measurements of hue in
terms of the relative phase of the chrominance signal with respect to
the color burst. Relative amplitude of chrominance to burst is
expressed in terms of the displacement from center (radial dimension
of amplitude) towards the color point which corresponds to 75% (or
100%) amplitude for the color being measured.