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

Performance Check Procedure—2205 Service

2. Check External Triggering

CH 1 VOLTS/DIV
SEC/DIV
Horizontal MODE
Trigger MODE
Trigger SOURCE
Connect the leveled sine--wave generator out-
put via a 5 0 -fi coaxial cable, a 5 0 -fl termination,
and a dual-input coupler to the CH 1 OR X input con­
nector and EXT INPUT OR Z input connectors.
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. S e t:.. ................
CH 1 VOLT/DIV
SEC/DIV
Horizontal MODE
f. Set the generator to produce a 3-division
(150 mV) horizontal display at an output frequency
of 30 MHz.
g. Repeat part d.
h. Disconnect the test equipment from the
instrument.
3. Check External Trigger Range
a. Set:
CH 1 VOLTS/DIV
SEC/DIV
Trigger SLOPE
b. Set the leveled sine-wave generator to
produce a 50-kHz, 6.4-division display.
c. Position the waveform equally about the
center horizontal graticule line.
4 -H )
d. Set:
Trigger MODE
Trigger SOURCE
20 mV
e. CHECK—Display is triggered along the entire
0.2 ms
positive slope of the waveform as the Trigger LEVEL
XI
control is rotated.
P-P AUTO
EXT, EXT
f. CHECK—Display is not triggered at either
extreme of rotation of the Trigger LEVEL control.
g. Set the Trigger SLOPE switch to negative
O - ) .
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.

4. Check Single Sweep Operation

50 mV
a. Set:
0.05 ms
MAG
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 -n coaxial
cable to the CH 1
c. Adjust the Trigger LEVEL control to obtain a
stable display.
d. Set:
Channel 1 AC-GND-DC
Trigger MODE
0.5 V
e. Press the SGL SWP RESET button. The
20 ms
TRIG'D/READY LED illuminates and remains on.
Positive
(-O
f. Set the Channel 1 AC-GND-DC switch to DC.
The INTENSITY control may require adjust­
ment to observe the single-sweep trace.
NORM
EXT, EXT
10 mV
0.5 ms
CH 1
Positive
i - r )
X input connector.
or
GND
NOTE
SGL SWP