Basic Measurements
1760 SeriesComponent Waveform/Vector Monitor User Manu al 4-9
MakingVectorMeasurements

Chroma Bandwidth

The horizontaland vertical axes of the vector graticule con-
tain markings for checking chroma bandwidth. A subcarrier
frequencysine wave (whose amplitude places it on theouter
compass rose) is used as a reference. When the frequency is
changed, the diameter of the circle should reduce. At a point
equal to 70.7% of full amplitude (--3dB), the re are gaps in
the horizontal andvertical axes. Thiscalibration aid makes
it possible to check the --3 dB points of the demodulator out-
put amplifiers.

Differential Phase and Gain

Differential gain (dG) and differential phase (d∅)measure-
ments use the graticule markings located at the outer edge of
the B--Y or U axis. See Figure4-5.
10o
2°dφ
dφ
Figure 4-5. Differential gain and phase measurements.