Trigger; Adjust Internal And External Trigger Offset - Tektronix 2235A Instruction Manual

Adjustment Procedure
-
2235A Instruction
TRIGGER
Equipment Required (See Table 4-1):
Leveled Sine-Wave Generator
1 O X Attenuator
50-a BNC Coaxial Cable
Alignment Tool
5 0 4 BNC Termination
See ADJUSTMENT LOCATIONS
1
at the back of this manual for test points and adjustment locations.
INITIAL CONTROL SETTINGS PROCEDURE STEPS
Vertical (Both Channels)
1. Adjust Internal and External Trigger Offset (R309
and R387))
POSI-IION Midrange
MODE BOTH-ALT a. Set the Channel 1 trace and the Channel 2 trace to
BW LIMIT Off (button out)
the center horizontal graticule line using the Channel
INVERT Off (button out) 1 and Channel 2 POSITION controls.
VOLTSIDIV
VOLTSIDIV Variable
lnput Coupling
Horizontal
POSITION
MODE
A and B SECIDIV
SECIDIV Variable
XI 0 Magnifier
B DELAY TIME POSITION
B TRIGGER
SLOPE
LEVEL
A 'TRIGGER
VAR HOLDOFF
Mode
SLOPE
LEVEL
A & B SOURCE
A COLlPL
A EXT COUPL
50 m~
CAL detent
GND
Midrange
A
20 jls
CAL detent
Off (knob in)
Fully counter-
clockwise
b. Set both lnput Coupling switches to DC.
c. Connect the leveled sine-wave generator output via
a 5 0 4 cable, 10X attenuator, and a 5 0 4 termi-
nation to the BNC female connector of the dual-
input coupler. Connect the two BNC male
connectors of the dual-input coupler to the CH 1 and
CH 2 connectors.
d. Set the generator to produce a 50 kHz, 4-division
display on both channels.
e. Rotate the A TRIGGER LEVEL control to the
midraoge position (equal distance between the
+
and
-
positions).
Positive (button
f. Vertically center both displays with the Vertical
out) POSITION controls and horizontally position the
Midrange
start of the displays on the 2nd vertical graticule line.
NORM
P-P AUTO
Positive (button
out)
Midrange
VERT MODE
NORM
DC
g. ADJUST-TheTrigger Offset (R309) so that both dis-
plays are superimposed and start at the center hori-
zontal graticule line.
h. Disconnect the dual-input coupler from the CH 2
input connector and connect it to the EXT INPUT
connector.
i. Set the generator to produce a 8-division display.
j.
Set the A & B SOURCE switch to A EXT position.
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