Check External Trigger Range; Check Single Sweep Operation - Tektronix 2205 Service Manual

Adjustment Procedure—2205 Service
and dual-input coupler to the CH
a
nector and EXT INPUT
o r
c. Set the generator to produce a 4-division
(80 mV) horizontal display at an output frequency of
5 MHz.
d. CHECK—Stable display can be obtained by
adjusting the Trigger LEVEL control for each switch
combination given in Table 4-4.
e. Set:
CH 1 VOLT/DIV
SEC/DIV
Horizontal MODE
f. Set the leveled sine-wave generator to pro­
duce a 50-KHz, 3-division (150 mV) display.
g. Set the generator output to 30 MHz.
h. Repeat part d.

7. Check External Trigger Range

a. Set:
CH 1 VOLTS/DIV
SEC/DIV
Trigger SLOPE
b. Set the leveled sine-wave generator to pro­
duce a 50-kHz, 6.4-division display.
c. Position the waveform equally about the center
horizontal graticule line.
d. Set: 1
Trigger MODE
Trigger SOURCE
e. CHECK—Display is triggered along the entire
positive slope of the waveform as the Trigger LEVEL
control is rotated.
f. CHECK—Display is not triggered at either
extreme of rotation of the Trigger LEVEL control.
g . Set the Trigger SLOPE switch to negative (~v_).
5 -1 8
X input con­
1
o r
2 input connectors.
50 mV
0.05 ms
MAG
0.5 V
20 ms
Positive (-/"")
NORM
EXT, EXT
h. CHECK—Display is triggered along the entire
negative slope of the waveform as the Trigger
LEVEL control is rotated.
i. CHECK—Display is not triggered at either
extreme of rotation of the Trigger LEVEL control.
j. Disconnect the test equipment from the
instrument.

8. Check Single Sweep Operation

a. Set:
CH 1 VOLTS/DIV
SEC/DIV
Trigger SOURCE
Trigger SLOPE
b. Connect 50-mV, standard-amplitude Signal
from the calibration generator via a 5 0 -0 coaxial
cable to the CH 1 X input connector.
o r
c. Adjust the Trigger LEVEL control to obtain a
stable display.
d. Set: ■ "
Channel 1 AC-GND-DC
Trigger MODE
e. Press the SGL SWP RESET button. The
TRIG'D/READY LED illuminates and remains on.
f. Set the Channel 1 AC-GND-DC switch to DC.
NOTE
The INTENSITY control may require adjust­
ment to observe the single-sweep trace.
g. CHECK— TRIG'D/READY LED goes out and a
single sweep occurs.
h. Press the SGL SWP RESET button several
times.
i. CHECK—A single-sweep trace occurs, and the
TRIG'D/READY LED illuminates briefly every time the
SGL SWP RESET button is pressed.
j. Disconnect the test equipment from the
instrument.
10 mV
0.5 ms
C H I
Positive (-/"-)
GND
SGL SWP