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Performance Verification: Digital Section
4-16
WFM90D and WFM91D Service Manual
6. Check that the displayed video is 714 mV,
ᐔ2% (approximately 1/4 major
division) from graticule baseline to white bar (0 IR E to +100 IRE for 525 or
0 V to +700 mV for 625).
7. Set the COMP SEL to BLUE.
8. Check that the displayed video is 714 mV,
ᐔ2% (approximately 1/4 major
division) from graticule baseline to white bar (0 IR E to +100 IRE for 525 or
0 V to +700 mV for 625).
9. Set the COMP SEL to RED.
10. Check that the displayed video is 714 mV,
ᐔ2% (approximately 1/4 major
division) from graticule baseline to white bar (0 IR E to +100 IRE for 525 or
0 V to +700 mV for 625).
11. Set the COMP SEL to Y.
12. Check that the displayed video is 1 V,
ᐔ2% (approximately 1/4 major
division) from sync tip to white bar (--40 IRE to +100 IRE for 525 or
--300 mV to +700 mV for 625).
13. Exit the digital waveform menu.
Check Frequency Response
This procedure verifies the following requirement:
Flat Filter, 1 V Full Scale, 50 kHz to 4.5 MHz, within 4%
1. Enter the Configure menu. Select PRESETS and the n select DEFAULT.
2. Select the WFM display mode on the WFM90D or WFM91D monitor.
3. Press MENU to display the waveform menu.
4. Change the SWEEP to 1H.
5. Press and hold MENU for two seconds to display the digital waveform
menu.
6. Set the COMP SEL to Y and exit the menu.
7. Set the digital signal generator to output a 100% sweep signal.
8. Check that the variation in the peak-to-peak amplitude of the signal is less
than 4% from the beginning of the sweep to half-way between the last two
markers (0.25 major divisions on a 60% sweep or 0.4 major divisions on a
100% sweep to 4. 5 MHz).