Tektronix WFM90, WFM91 Vector Gain and X5 Gain Phase

Adjustment Procedures
WFM 90 and WFM 91 Service Manual 5–9
Perform the following steps to adjust the vector gain and X5 gain phase:
a. WFM 90 ONLY — Verify that the television signal generator has setup
turned on.
b. Select VEC GAIN from the Calibration menu, select CAL, and then
select TEST ON.
c. Adjust the Y and B buttons so that the vector dots land in the center of
the red and cyan graticule target boxes. See Figure 5–1.
d. Adjust the A and " buttons so that the vector dots land in the center of
the yellow and blue graticule target boxes. See Figure 5–1.
Yellow
Cyan
Blue
Blue
Figure 5–1: NTSC graticule showing the vector gain adjustment
e. Select CAL MENU, and then select SAVE.
f. Select X5 PHASE from the Calibration menu, and then select CAL.
g. Select PHASE then use the Arrow Buttons to position the burst vector
exactly on the 180_ graticule line.
h. Select X5 GAIN, and then select X5 PHASE.
i. Adjust the Arrow Buttons so that the burst vector lands exactly on the
180_ graticule line.
j. Select CAL MENU, and then select SAVE.
Vector Gain and X5 Gain
Phase