Performance Verification: AnalogS ection
4-6 WFM90D and WFM91D Service Manual
Sweep Timing and IntegralLinearity
This procedureverifies the following requirement:
Sweep TimingAccuracy: 5 s/Div. (1 Line), 10 s/Div. (2Line), and 1.0 s/Div.
(2 Line + MAG), 2%. 0.2 s/Div. (1 Line + MAG) 3%. IntegralLinearity:
1%.
1. Connect the multiburst signalfrom the analog television signal generator to
the VIDEO IN connector on the WFM90D or WFM91D monitor, and to the
input on the frequencycounter, using a T-connector,75 Ωcable, and 75 Ω
in-line termination.
2. Set the multiburstgenerator controls to Low, Continuous, and Manual. Set
the output frequencyto 100 kHz (as read on the frequency counter).
3. Check for one cycleper division, 1 minor division, over the center ten
graticuledivisions.
4. Select 1H SWEEP from the Operating menu.
5. Set the multiburst generatorfrequency to 200 kHz.
6. Check for one cycleper division, 1 minor division, over the center ten
graticuledivisions.
7. Adjust the multiburst generatorfrequency so that the cycles land exactly on
the first and tenth graticulemarks.
8. Check that each cycle is within 0.5 minor division of a major graticule
mark.
9. Select MAG ON from the Operating menu.
10. Set the multiburst generatorfrequency to 2 MHz.
11. Check for one cycle per division, 1 minor division, over the center ten
graticuledivisions, and also at both endsof the magnified sweep (using the
horizontal position control),ignoring the first and last cycle.
12. Set the multiburst generatorfrequency to 1 MHz.
13. Select 2H SWEEP from the Operating menu.
14. Check for one cycleper division, 1 minor division, over the center ten
graticuledivisions, and also at both endsof the magnified sweep (using the
horizontal position control),ignoring the first and last cycle.
15. Select MAG OFF from the Operating menu.