Monitor Audio Vector User Manual download pdf (Page 64)

Reference: Making Measurements

3–14

WFM 90 & WFM 91 User Manual

Differential Phase and Gain Measurement Box

Differential gain (dG) and differential phase (dϕ) measurements use

the graticule markings located at the outer edge of the B-Y or U axis

180° line. See Figure 3–6.

2°

dφ

Figure 3–6: Differential gain and phase measurement box

Making Vector Measurements

Chroma Bandwidth

The horizontal and vertical axes of the vector graticule contain

markings for checking chroma bandwidth. A subcarrier frequency

sine wave (whose amplitude places it on the outer compass rose) is

used as a reference. When the frequency is changed, the diameter of

the circle should reduce in size. At a point equal to 70.7% of full

amplitude (–3 dB), there are gaps in the horizontal and vertical axes.

This calibration aid makes it possible to check the –3 dB points of

the demodulator output amplifiers.

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Monitor Audio Vector User Manual Page 64