TEK 2225 - Page 81

Adjustment Procedure-2225 Service
o. Set the generator to produce a four-division
(80
mV) display at an output frequency of 5 MHz.
p. Repeat Part d.
q. SET:
CH 1
VOLTIDIV
SECIDIV
Horizontal MODE
Horizontal MAG
50
mV
0.05 JLS
MAG
X5
r. Set the generator to produce a five-division
(250
mV) display at an output frequency of 50 MHz.
s. Repeat Part d.
t. Disconnect the test equipment from the
instrument.
Trigger COUPLING AC
Trigger SLOPE
Positive (I)
b. Connect the leveled sine-wave generator out-
put via a
50-Cl BNC coaxial cable, a 50-Cl BNC
termination, and a dual-input coupler to the CH 1
OR
X and the EXT INPUT OR Z input connectors.
c. Set the leveled sine-wave generator to
produce a 50-kHz, five-division display.
d. Position the waveform equally about the
center horizontal graticule line.
e. SET:
Trigger MODE
Trigger SOURCE
NORM
EXT, EXT
f. ADJUST-Ext Trig Offset
(R360) so that the
trace is untriggered at either end of the Trigger
LEVEL control.
4. Check LF P-P AUTO Trigger
g. Set the Trigger
COLlPLlNG switch to DC.
a. SET:
CH 1 VOLTSIDIV
Trigger MODE
Trigger
SOLIRCE
Trigger SLOPE
0.1
V SECIDIV
20 ms
P-P AUTO
CH 1
Positive
(1)
b. Connect the low-frequency sine-wave
generator output via a
50-Cl BNC coaxial cable and a
6004 BNC termination to the CH 1 OR X input
connector.
c. Set the low-frequency sine-wave generator
output to produce a 20-Hz, one-division display.
d. CHECK-For stable triggering in both positive
(I) and negative (I) slope. Ensure that the
TRIG'D light comes on when triggered.
5. Adjust External Trigger Offset and Range
a. SET:
CH 1
VOLTSIDIV 0.5 V
CH 1 AC-GND-DC DC
Vertical MODE CH
1
SECIDIV 20 ps
Trigger MODE P-P AUTO
Trigger SOURCE CH 1
h. CHECK-That the display can
be untriggered at
either end of the Trigger LEVEL control.
EXT
i. Set the Trigger SOURCE switch to
10
j. CHECK-That the display can be triggered
about the midrange of the Trigger LEVEL control.
k. Set the Trigger SLOPE switch to negative (X)
and repeat Part j.
I. Disconnect the test equipment from the
instrument.
6. Check Single Sweep Operation
a. SET:
CH 1 VOLTSIDIV
CH 1 AC-GND-DC
Vertical MODE
SECIDIV
Horizontal MODE
Trigger MODE
Trigger SOURCE
Trigger COUPLING
Trigger SLOPE
10
mV
DC
CH 1
0.5 ms
XI
NORM
CH 1
AC
Positive
(I)
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