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WFM90D and WFM91D Service Manual
4-5
Performance Verification: Analog Section
Perform the following steps before beginning the verification procedures:
1. Plug the AC power adapter into the instrument and then plug the adapter into
the AC power source.
2. Connect the multiburst signal from the analog television signal generator
through a 75 Ω in-line termination and dual-input coupler to the VIDEO IN
and REF IN connectors on the WFM90D or WFM91D monitor.
3. Set the input termination switches to the HIZ position.
4. Turn on the WFM90D or WFM91D monitor.
5. Enter the Configure menu. Select PRESETS and the n select DEFAULT.
NOTE. Be sure you have warmed up the instrument for at least 20 minutes before
you perform any of the verification procedures.
Sync Separation
This procedure verifies the following requirement:
Signal synchronization will occur with input signals of composite video or black
burst, with sync amplitudes of 40 IRE (300 mV PAL) ᐔ6 dB for internal
reference, and sync amplitudes of between 143 mV and 4 V for external
reference.
1. Enter the Configuration menu and select the INPUT category.
2. Check for a stable display while switching between INT and EXT REF.
3. Remove the termination from the dual-input coupler.
4. Check for a stable display while switching between INT and EXT REF.
5. Add three 75 Ω terminations to the dual-input coupler.
6. Check for a stable display while switching between INT and EXT REF.
7. Select INT REF from the Configuration menu INPUT category.
8. Remove the dual-input coupler from the instrument.