Performance Tests
4- 52
TDS 420A, TDS 430A & TDS 460A Service Manual
H
CHECK that a stable trigger is obtained with the last of TV field 1
and the beginning of TV field 2 displayed. (If the last line is
½
of a
TV line duration (31.75
s), then it is the end of field 1 — see
waveform R2 in Figure 4--20.)
H
Press the side menu button
All
.
H
Press the main menu button
Mode and Holdoff
. Then press the side
menu button
Holdoff
.
H
Use the
General Purpose
knob to set the holdoff to
1
.
R1 waveform: Note that two
full lines start the display
R2 waveform: Note that 1
½
lines start the display
R3 and R4 waveforms: Note
that with non-interlaced,
both fields, scan mode,
CH 1 switches between the
R3 and R4 displays
Figure 4- 20: Measurement of Video Sensitivity
H
Rotate the horizontal
POSITION
control clockwise to move the
ends of both fields to the center of the display.
H
CHECK that a stable trigger is obtained while alternating between
field 1 and field 2. (If the last line is alternating between a full TV
line and
½
a line in duration (63.5
s and 31.75
s respectively),
then triggering is occurring on both fields — see waveforms R3 and
R4 in Figure 4--20.)
d.
C
heck delay by lines:
H
Press the main-menu button
Scan
.
Summary of Contents for TDS 420A
Page 16: ...Service Safety Summary xii TDS 420A TDS 430A TDS 460A Service Manual ...
Page 36: ...Nominal Traits 1 14 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 44: ...Warranted Characteristics 1 22 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 54: ...Installation 2 6 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 64: ...Operating Information 2 16 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 72: ...Performance Verification Procedures 4 4 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 160: ...Maintenance 6 8 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 226: ...Removal and Installation Procedures 6 74 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 260: ...Options and Accessories 7 6 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 262: ...Electrical Parts List 8 2 TDS 420A TDS 430A TDS 460A Service Manual ...
Page 272: ...Diagrams 9 10 TDS 420A TDS 430A TDS 460A Service Manual ...