TEK 2225 - Page 79

Adjustment Procedure-2225 Service
TRIGGER
Equipment Required (See Table 4-1):
Leveled Sine-Wave Generator (Item 2) Dual-Input Coupler (Item
9)
Low-Frequency Sine-Wave Generator (Item 4) 50-Cl BNC Termination (Item 10)
Screwdriver (Item 5)
600-Cl BNC Termination (Item 1 1 )
50-Cl BNC Coaxial Cable ( Item 8)
See ADJUSTMENT LOCATIONS at the back of this manual for adjustment locations.
INITIAL CONTROL SETTINGS
Vertical
POSITION (both) Midrange
MODE BOTH, NORM,
and ALT
VOLTSIDIV (both) 50 mV
VOLTSIDIV Variable (both) CAL detent
Magnification (both)
Xl (CAL
knobs in)
AC-GND-DC (both) DC
Horizontal
POSITION (COARSE and FINE) Midrange
MODE
XI
SECIDIV 2 CLS
SECIDIV Variable CAL detent
SLOPE
LEVEL
MODE
HOLDOFF
SOURCE
COUPLING
Positive
(I)
Midrange
P-P AUTO
MIN
VERT MODE
DC
PROCEDURE STEPS
1. Adjust Trigger Offset Channel Balance (R338)
b. Set the generator to produce a four-division
display at an output frequency of 50 kHz.
c. Center the CH 1 and CH 2 traces vertically.
d. Adjust the SECIDIV Variable control to give
one and a half sine-wave periods across the
graticule.
e. ADJUST-CH
11CH 2 Balance (R338) (found
under the attenuator board) until the sine waves
coincide.
f. Return the SECIDIV variable control to the
detent (CAL) position.
2. Adjust Trigger Sensitivity, Slope Balance,
and P-P
offset (R489, R481, and R478)
a. SET:
CH 1
VOLTSIDIV 0.1 V
Vertical MODE CH
1
SECIDIV 20 CLS
Trigger SOURCE CH 1
b. Connect the leveled sine-wave generator out-
put via a 50
i2 BNC coaxial cable and a 50 l2 BNC
termination to the CH
1 OR X input connector.
c. Set the generator to produce a 2.2-division
display at an output frequency of 50 kHz.
a. Connect the leveled sine-wave generator
out-
d. SET:
put via a
50-il BNC coaxial cable, a 50-il BNC
termination, and a dual-input coupler to the CH 1
OR
CH 1 VOLTSIDIV
X and the CH 2 OR Y input connectors.
Trigger MODE
1
v
NORM
Scam by ARTEK MEDLQ =>