Tektronix WFM700 Series, Service Manual

Page: 62 / 194

Performance Verification
2- 30
WFM700 Series Waveform Monitors Service Manual
This test checks the Eye vertical deflection factor. This procedure is only
applicable for a WFM7M Input Module.
Performance Requirement. This test verifies performance characteristics and is
listed in the test record.
1. Connect the SD video generator to the 75
8
input of the test oscilloscope
using a 75
8
cable. Use a 75
8
-to-50
8
adapter on the input of the test
oscilloscope if necessary.
2. Set the SD video generator for a 525-format 100% color bars signal.
3. Set the test oscilloscope to view the signal. The following oscilloscope
settings normally provide a usable display.
Vertical Scale 200 mV
Horizontal Scale 2 ns/div
Horizontal Trigger Position 10%
Trigger Level 100 mV
4. Measure the amplitude of the signal on the test oscilloscope. Note this
measurement as the Reference Amplitude. See Figure 2--10 for measurement
points.
Measure signal,
disregard peaks and dips
Figure 2- 10: Eye vertical scale reference level screen
Eye Vertical Scale
(WFM7M only)