Tektronix TDS 420A, Service Manual, Page: 104 / 288

Performance Tests
4- 36
TDS 420A, TDS 430A & TDS 460A Service Manual
H
Set the frequency of the time standard to 1.0 MHz (or a period of
1.00
s).
H
Adjust the amplitude of the time standard for a 5 to 7
division display.
H
Press CLEAR MENU .
H
Press SET LEVEL TO 50% .
H
Rotate the horizontal and vertical POSITION controls to move the
rising edge of the waveform so that it crosses the center of both the
horizontal and vertical graticule lines.
H
Press HORIZONTAL MENU ; then press the main-menu button
Time Base . Press the side-menu button Delayed Only
H
Use the horizontal SCALE knob to set the D (delayed) time base
to 100 ns.
H
Press the side-menu button
Delayed Runs After Main
; then use the
General Purpose knob to set Delayed Runs After Main to 10.0 s.
H
CHECK that the rising edge of the waveform crosses the center
horizontal graticule line at a point within
±
0.5 divisions of the center
graticule (see Figure 4--11).
H
Use the horizontal SCALE knob to set the D (delayed) time base
to 50 s. (The scale of the Main time base will also change.)
H
Use the General Purpose knob to set Delayed Runs After Main
to 100 s.
H
Use the horizontal SCALE knob to set the D (delayed) time base
to 100 ns.
H
CHECK that the rising edge of the waveform crosses the center
horizontal graticule line at a point within
±
0.5 divisions of the
center graticule.