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Adjustment Procedures: Analog Section
5-8
WFM90D and WFM91D Service Manual
2. Connect one side of the dual-input coupler to the VIDEO IN connector.
3. Connect the Tektronix part 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-Peak Detector Head to the Tektronix
part number 015-0408-00 Peak-to-Peak Detector + Input.
5. Connect the peak-to-peak detector Output to the digital multimeter, or an
oscilloscope.
6. Select EXT REF from the C onfiguration menu.
7. Set the leveled sine wave generator frequency to 50 kHz and adjust the
generator amplitude for exactly 100 IRE (700 mV PAL) of display.
8. Adjust the peak-to-peak detector Plus amplifier and input control until the
green LED is on.
9. Note the digital multimeter readout level or the oscilloscope DC level.
10. Set the sine wave generator frequency 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 oscilloscope level, matches that noted in step 9.
12. Select X1 FREQ from the Calibration menu, and then select CAL.
13. Adjust the arrow buttons 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 leveled sine wave generator frequency to 50 kHz, and adjust the
generator amplitude for exactly 100 IRE (700 mV PAL) of display.
17. Adjust the peak-to-peak detector Plus amplifier and input control fully
counterclockwise.
18. Note the digital multimeter readout level or the oscilloscope DC level.
19. Set the sine wave generator frequency to 3.58 MHz (4.43 MHz PAL).
20. Adjust the amplitude of the sine wave generator so that the digital multime-
ter readout, or oscilloscope level, matches that noted in step 18.
21. Select X5 FREQ from the Calibration menu, and then select CAL.
22. Adjust the arrow buttons for a display amplitude of exactly 100 IRE
(700 mV PAL).