Adjustment Procedures:Analog Section
5-8 WFM90D and WFM91D Service Manual
2. Connect one side of the dual-input couplerto the VIDEO IN connector.
3. Connect the Tektronixpart number 015-0413-00 Peak-to-Peak Detector
Head to the other end of the dual-input coupler,using the female-to-female
BNC connector.
4. Connect the other end of the Peak-to-PeakDetector Head to the Tektronix
part number 015-0408-00P eak-to-PeakDetector + Input.
5. Connect the peak-to-peakdetector Output to the digital multimeter, or an
oscilloscope.
6. Select EXT REF from the Configuration menu.
7. Set the leveled sine wave generatorfrequency to 50 kHz and adjust the
generatoramplitude for exactly 100 IRE (700 mV PAL) of display.
8. Adjust the peak-to-peakdetector Plus amplifier and input control until the
green LED is on.
9. Note the digital multimeter readoutlevel or the oscilloscope DC level.
10. Set the sine wave generatorfrequency to 3.58 MHz (4.43 MHz PAL).
11. Adjust the amplitude of the sine wave generator so that the digital multime-
ter readout, or oscilloscopelevel, matches that noted in step 9.
12. Select X1 FREQ from the Calibration menu, and then selectCAL.
13. Adjust the arrowbuttons for a display amplitude of exactly 100 IRE
(700 mV PAL).
14. Select CAL MENU, and then select SAVE.
15. Select X5 GAIN from the Operating menu.
16. Set the leveledsine wave generator frequency to 50 kHz, and adjust the
generatoramplitude for exactly 100 IRE (700 mV PAL) of display.
17. Adjust the peak-to-peakdetector Plus amplifier and input control fully
counterclockwise.
18. Note the digital multimeter readoutlevel or the oscilloscope DC level.
19. Set the sine wave generatorfrequency to 3.58 MHz (4.43 MHz PAL).
20. Adjust the amplitude of the sine wave generatorso that the digital multime-
ter readout, or oscilloscopelevel, matches that noted in step 18.
21. Select X5 FREQ from the Calibration menu, and then selectCAL.
22. Adjust the arrowbuttons for a display amplitude of exactly 100 IRE
(700 mV PAL).