Trigger - Tektronix 2215A Instruction Manual

Equipment Required (see Table 4-1):
Leveled Sine-Wave Generator (Item 2)
50-fi BNC Cable (Item 4)
50-!i BNC Termination (Item 5)
Dual-Input Coupler (Item 6)
a t th e b a c k o f th is m a n u a l fo r te s t p o in ts a n d a d ju s tm e n t locations.
INITIAL CONTROL SETTINGS
Vertical (Both Channels)
POSITION
VERTICAL MODE
BW LIMIT
VOLTS/DIV
VOLTS/DIV Variable
INVERT
Input Coupling
Horizontal
POSITION
HORIZONTAL MODE
A and B SEC/DIV
SEC/DIV Variable
X I0 Magnifier
B DELAY TIME POSITION
B TRIGGER
SLOPE
LEVEL
A I l i l / H A C n
A TRIGGER
VAR HOLDOFF
Mode
SLOPE
LEVEL
A&B INT
A SOURCE
A EXT COUPLING
REV J U L 1984

TRIGGER

See
ADJUSTMENT LOCATIONS 1
Midrange
BOTH-ALT
Off (button out)
0.5 V
CAL detent
Off (button out)
GND
Midrange
A
1 ms
CAL detent
Off (knob in)
Fully counterclockwise
OUT
Midrange
NORM
P-P AUTO
OUT
Midrange
CH 2
INT
DC
Adjustment Procedure— 2215A Service
10X Attenuator (Item 7)
Digital Voltmeter (Item 12)
Screwdriver (Item 13)
PROCEDURE STEPS
1. Adjust Trigger Offset (R309)
a. Set the Channel 1 trace and the Channel 2 trace to
the center horizontal graticule line using the Channel 1 and
Channel 2 POSITION controls.
b. Connect the digital voltmeter low lead to chassis
ground and the high (volts) lead to W4000-1 (Alt Sweep
Logic circuit board connector to the Main circuit board).
c. CHECK— The offset voltage reading is less than 80
mV. Note the reading for use in part e.
d. Set the A&B INT switch to CH 1.
e. ADJUST— Trigger Offset (R309) so that the voltage
reading is the same as that obtained in part c.
f. Set the A&B INT switch to CH 2.
g. Repeat parts c through f until there is 1 mV or less
difference in the voltmeter readings between the CH 1 and
CH 2 positions of the A&B INT switch.
2. Adjust Trigger Sensitivity (R479) and (R627)
a. Set:
VERTICAL MODE
CH 1 VOLTS/DIV
AC-GND-DC (both)
A and B SEC/DIV
CH 1
0.1 V
AC
ns
10
5-19