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Measurements
1780R-Series Operator’s Manual
4–15
settings will be stored and recalled at next entry to DP & DG mode.
The amount of distortion is read from the graticule scale.
DIFF PHASE & DIFF GAIN Measurement Procedure
1. Apply a staircase signal or a ramp signal with subcarrier to the
1780R-Series.
2. Touch <DP & DG>.
3. Use the vectorscope variable gain control to set the amplitude of
the chroma to be measured to the edge of the compass rose.
4. Use the large knob to set the phase of the chroma to be measured
to the nine o’clock position on the vectorscope display.
5. Use the Waveform Vertical Position control to place the
beginning of the trace on a convenient graticule reference line.
6. Using the two-line display, differential phase and gain are
displayed simultaneously on the left and right portions of the
waveform monitor CRT. If necessary, adjust the vectorscope
Variable Gain to vertically align the two displays.
7. Differential phase is the amount of the left signal that is above or
below the graticule reference line. Read the amount directly off
the graticule scale; 1 major division (10 IRE or 100 mV) = 1_.
8. Differential gain is the amount of the right signal that is above or
below the graticule reference line. Read the amount directly off
the graticule scale; 1 major division (10 IRE or 100 mV) = 1%.
Measurements
1780R-Series Operator’s Manual
4–15
settings will be stored and recalled at next entry to DP & DG mode.
The amount of distortion is read from the graticule scale.
DIFF PHASE & DIFF GAIN Measurement Procedure
1. Apply a staircase signal or a ramp signal with subcarrier to the
1780R-Series.
2. Touch <DP & DG>.
3. Use the vectorscope variable gain control to set the amplitude of
the chroma to be measured to the edge of the compass rose.
4. Use the large knob to set the phase of the chroma to be measured
to the nine o’clock position on the vectorscope display.
5. Use the Waveform Vertical Position control to place the
beginning of the trace on a convenient graticule reference line.
6. Using the two-line display, differential phase and gain are
displayed simultaneously on the left and right portions of the
waveform monitor CRT. If necessary, adjust the vectorscope
Variable Gain to vertically align the two displays.
7. Differential phase is the amount of the left signal that is above or
below the graticule reference line. Read the amount directly off
the graticule scale; 1 major division (10 IRE or 100 mV) = 1_.
8. Differential gain is the amount of the right signal that is above or
below the graticule reference line. Read the amount directly off
the graticule scale; 1 major division (10 IRE or 100 mV) = 1%.