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Performance Verification
4–6
WFM 90 and WFM 91 Service Manual
This procedure verifies the following requirement:
Sweep Timing Accuracy: 5 ms/Div. (1 Line), 10 ms/Div. (2 Line), and 1.0 ms/Div.
(2 Line + MAG), "2%. 0.2 ms/Div. (1 Line + MAG) "3%. Integral Linearity:
"1%.
1. Connect the multiburst signal from the television signal generator to the
VIDEO IN connector on the WFM 90 or WFM 91 Handheld Waveform,
Vector, Picture, and Audio Monitor, and to the input on the frequency
counter, using a T-connector, 75 W cable, and 75 W in-line terminator.
2. Set the multiburst generator controls to Low, Continuous, and Manual. Set
the output frequency to 100 kHz (as read on the frequency counter).
3. Check for one cycle per division, "1 minor division, over the center ten
graticule divisions.
4. Select 1H SWEEP from the Operating menu.
5. Set the multiburst generator frequency to 200 kHz.
6. Check for one cycle per division, "1 minor division, over the center ten
graticule divisions.
7. Adjust the multiburst generator frequency so that the cycles land exactly on
the first and tenth graticule marks.
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 generator frequency to 2 MHz.
11. Check for one cycle per division, "1 minor division, over the center ten
graticule divisions, and also at both ends of the magnified sweep (using the
horizontal position control), ignoring the first and last cycle.
12. Set the multiburst generator frequency to 1 MHz.
13. Select 2H SWEEP from the Operating menu.
14. Check for one cycle per division, "1 minor division, over the center ten
graticule divisions, and also at both ends of the magnified sweep (using the
horizontal position control), ignoring the first and last cycle.
15. Select MAG OFF from the Operating menu.
Sweep Timing and Integral
Linearity