Performance Verification
WVR610A & WVR611A Waveform Rasterizers Service Manual
4- 37
Use special 12.5T NTSC multi--pulse signal and cursors to measure group delay.
1.
Press
FACTORY
on the waveform rasterizer.
2.
Connect the precision video generator to one of the Composite A input
connectors and terminate the other connector with the precision terminator.
3.
Set the precision generator for special 12.5T multiburst. This is a custom test
signal with more packets for better coverage.
4.
Press the
CMPST A
,
CURSOR
and
FULL
buttons.
5.
Adjust the cursors to be near the zero portions of the waveform.
6.
Press
5X
and
VAR
. Use the
GENERAL
knob to increase the gain to 10X.
7.
Use the cursors to measure the peak-to-peak deviation in the baseline of the
multipulse packets.
8.
The peak-to-peak deviation of the baseline is 0.1% per ns. So, for a 10 ns
deviation on a 714 mV signal, you should measure 7.1 mV. Record the
value in the test record.
Apply a pulse and bar signal and use cursors to measure the difference between
the two.
1.
Press
FACTORY.
2.
Connect the precision video generator to one of the
Composite A
input
connectors and terminate the other connector with the precision terminator.
3.
Set the precision generator for NTSC Pulse and Bar.
4.
Press the
CMPST A
,
CURSOR
and
FULL
buttons.
5.
Adjust the cursors to be near the top portions of the waveform.
6.
Use the VERTICAL position knob to move the top of the waveform to the
zero graticule.
7.
Press
5x
and
VAR
. Use the GENERAL knob to increase the gain to 10X.
8.
Place one cursor on the top of the “Bar”.
9.
Use the HORIZONTAL position knob to put the “pulse” on the dotted line at
the center of the screen.
10.
Press
MAG
to expand the pulse horizontally.
11.
Position the second cursor on the top of the pulse.
12.
Record the cursor delta in the test record.
Composite Analog Delay
Variation Over Frequency
(Group Delay)
Composite Analog Pulse
to Bar Ratio
Summary of Contents for WVR610A
Page 4: ......
Page 14: ...Table of Contents x WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 18: ...Service Safety Summary xiv WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 22: ...Preface xviii WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 23: ...Specifications...
Page 24: ......
Page 53: ...Operating Information...
Page 54: ......
Page 90: ...Operating Basics 2 36 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 132: ...Changing Instrument Settings 2 78 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 139: ...Theory of Operation...
Page 140: ......
Page 147: ...Performance Verification...
Page 148: ......
Page 201: ...Adjustment Procedures...
Page 202: ......
Page 204: ...Adjustments 5 2 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 205: ...Maintenance...
Page 206: ......
Page 228: ...Repackaging Instructions 6 22 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 229: ...Options...
Page 230: ......
Page 234: ...Options and Accessories 7 4 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 235: ...Diagrams...
Page 236: ......
Page 243: ...Replaceable Electrical Parts...
Page 244: ......
Page 246: ...Electrical Parts List 9 2 WVR610A WVR611A Waveform Rasterizers Service Manual...
Page 247: ...Replaceable Mechanical Parts...
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