Tektronix WFM 601A, Service Manual

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Performance Verification
4–18
WFM 601A, WFM 601E, & WFM 601M Service Manual
16. Lightning Mode
REQUIREMENT – Proper Lightning Display, Vertical Gain
Accuracy: 2%.
a. To load the factory preset, press the PRESET button, use the bezel knob
to pick the FACTORY setting, then press the RECALL bezel button.
b. Set the serial component generator output to the 100% Color Bars signal:
Modules DVG1
Signal Sets 525–270
Test Signals Color Bars
Color Bars 100% Color Bars
c. Select the Vector Display on the waveform monitor.
d. Press the lower bezel button to select the Lightning display.
e. CHECK – for dots in all targets.
17. Bowtie Interchannel Matching
REQUIREMENT – Null must occur within 2.0 ns of center marker.
a. To load the factory preset, press the PRESET button, use the bezel knob
to pick the FACTORY setting, then press the RECALL bezel button.
b. Select the high-frequency (2.5 MHz) Bowtie timing signal from the
serial component generator.
c. Turn on the waveform monitor Bowtie display.
d. Turn on SWEEP MAG.
e. Position the waveform to place the null and center marker of the Bowtie
display on the graticule area. See Figure 4–3.
4 ns
NULL
20 ns
Figure 4–3: HF Bowtie magnified to measure null offset