TEK 2225 - Page 67

Adjustment Procedure-2225 Service
VERTICAL
Equipment Required (See Table 4-1):
Calibration Generator (Item 1 )
50-a BNC Termination (Item1 0)
Leveled Sine-Wave Generator (Item 2)
1
OX Attenuator (Item 12)
Screwdriver (Item 5)
BNC Male-to-Miniature-Probe Tip (Item 13)
50-a BNC Coaxial Cable (Item 8) Low-Reactance Alignment Tool (Item 15)
Dual-Input Coupler (Item
9) 1 OX Probe (Provided with instrument)
See ADJUSTMENT LOCATIONS at the back of this manual for adjustment locations.
INITIAL CONTROL SETTINGS
Vertical
POSITION (both) Midrange
MODE CH 1, NORM
VOLTSIDIV (both) 5 mV
VOLTSIDIV Variable(both) CAL detent
Magnification (both)
Xl (CAL
knobs in)
AC-GND-DC (both) GND
Horizontal
POSITION (COARSE and FINE)
MODE
SECIDIV
SECIDIV Variable
MAG
Midrange
X 1
0.5 ms
CAL detent
X5
SLOPE
LEVEL
MODE
HOLDOFF
SOLIRCE
COUPLING
Positive
(f)
Midrange
P-P AUTO
MIN
EXT, EXT
AC
b. Position the trace on the center horizontal
graticule line using the CH 1 POSITION control.
c. Rotate the CH 1 VOLTSIDIV Variable control
clockwise to the CAL detent.
d. ADJUST-Var Bal
(R33) to set the trace to the
center horizontal graticule line.
e. Repeat Parts a through d until there is no trace
shift between the fully clockwise and the fully
counterclockwise positions of the CH 1
VOLTS/DIV
Variable control.
f. Return the CH 1 VOLTSIDIV Variable control to
the CAL detent.
2. Adjust Channel 2 Variable Balance (R84)
(SN 202908 and above)
a. Set Vertical Mode to Ch 2.
b. Rotate the CH 2 VOLTSIDIV Variable control
fully counterclockwise.
c. Position the trace on the center horizontal
graticule line using the CH 2 POSITION control.
PROCEDURE STEPS
d. Rotate the CH 2 VOLTSIDIV Variable control
clockwise to the CAL detent.
1. Adjust Channel 1 Variable Balance (R33)
e. ADJUST-Var Bal (R84), on the front-panel
a. Rotate the CH 1 VOLTSIDIV Variable control board to set the trace to the center horizontal
fully counterclockwise. graticule line.
Scm by ARTEK MEDLP =>