Adjustment Procedures:Digital Section
5-12 WFM90D and WFM91D Service Manual
Frequency Response
Perform thefollowing steps to adjust the frequency response:
1. Set the digital signal generatorfor a Pulse and B arsignal.
2. Select DG X1 FREQ from the Calibration menu, and then selectCAL.
3. Moving between position control(POS) and gain adjust (DG X1 FREQ),
adjust the arrow buttons for the flattestbottom on the modulated pulse.
4. Select DG CAL MENU, and then select SAVE.
5. Select DG X5 FREQ from the Calibration menu, and then selectCAL.
6. Moving between position control(POS) and gain adjust (DG X5 FREQ),
adjust the arrow buttons for the flattestbottom on the modulated pulse.
7. Select DG CAL MENU, and then select SAVE.
VectorGain and X5 Gain Phase
Perform thefollowing steps to adjust the vector gain and X5 gain phase:
1. Set the digital signal generatorfor a 75% color bar signal.
2. Select DG VEC GAIN from the Calibration menu, select CAL, and then
select TEST ON.
3. Adjust the up and down arrowbuttons so that the vector dots land in the
centerof the graticule target boxes.
4. Moving between PHASE and DG VEC GAIN, Adjust the leftand right
arrow buttons so that the vector dots land in the centerof the graticule target
boxes. See Figure 5--1.
5. Select DG CAL MENU, and then select SAVE.