WFM90D and WFM91D ServiceManual 4-15
Performance Verification: Digital Section
Perform the following steps beforebeginning the verification procedures:
1. Plug the AC power adapter into the WFM90D or WFM91D monitor and
then plug the adapter into the AC power source.
2. Connect the 75% color bar signal fromthe digital television signal generator
to the VIDEO IN connectoron the WFM90D or WFM91D monitor. Set the
digital television signalgenerator to output a 525 signal forthe WFM90D
monitor or a 625 signal for the WFM91D monitor.
3. Turnon the WFM90D orWFM91D monitor.
4. Set the input termination switches to the 75 Ωposition.
5. Check that the readout in the upper leftcorner of the display changes to
show: DIGITALCMPST. This indicates that the instrument is receiving the
serial digitalsignal.
6. Enter the Configure menu. SelectPRE SETS and then select DEFAULT.
NOTE. While checkingvalues in the follow ing proceduresteps, you may want to
clear the menufrom the screen. To do so, press the MENU button twice. Then
pressand hold the MENU button for two seconds when you need to enter the
digital menu again.

Check Sync Separation

This procedureverifies the following requirement:
1 V input displayed within 2%
1. Select Waveformmode on the WFM90D or WFM91D monitor.
2. Press and hold MENU for two seconds to displaythe digital waveform
menu.
3. Set the COMP SEL to COMPOSITE.
4. Check that the displayedvideo is 1 V, 2% (approximately 1/4 major
division) from synctip to white bar (--40 IRE to +100 IRE for 525 or
--300 mV to +700 mV for 625).
5. Set the COMP SEL to GREEN.