WFM90D and WFM91D ServiceManual 5-5
Adjustment Procedures: Analog Section
Perform thesesteps to preparethe instrument to be adjusted:
1. Plug the AC power adapter into the WFM90D or WFM91D, and then plug
the adapterinto the AC power source.
2. Set the input terminationswitches to the HIZ position.
3. Connect a 75% color bar signal fromthe analog television signal generator
to the VIDEO IN connector,using a 75 Ωin-line termination.
4. Turnon the instrument.
5. Press the CONFIG button. Select PRESETS, and then select DEFAULT.
6. Read How to Adjust Instrument Settings on page 5--3.

Raster VCO

Perform thesesteps to adjust the rasterVCO:
1. Select RAST VCO from the Calibration menu.
2. Select CAL, and then select AUTO.
3. Waituntil the CANCEL message disappears from the screen.
4. Select CAL MENU, and then select SAVEfrom the menu.

Sweep Timing and HorizontalMag Registration

Perform thesesteps to adjust the sweep timing and horizontal mag registration:
1. Replace the signal on the VIDEO IN connectorwith the output from the
function generator.Be sure to use a 50 Ω-to-75 Ωminimum-loss attenuator
and a precision (1%)50 Ωcable if the generator specifies a 50 Ωoutput.
2. Set the function generatorfor a 200 kHz sine wave output.
NOTE. Verifythe generator frequencies used in these steps by checking them on
the frequencycounter.
3. Select 1H SWEEP from the Operating menu.
4. Select 1H SWEEP from the Calibrationmenu, and then select CAL.
5. Adjust the arrowbuttons for one cycle per major division.