Adjustment Procedure—2215A Service
TRIGGER
Equipment Required (see Table 4-1):
Leveled Sine-Wave Generator (Item 2) 10X Attenuator (Item 7)
50-fi BNC Cable (Item 4) Digital Voltmeter (Item 12)
50-!i BNC Termination (Item 5)
Screwdriver (Item 13)
Dual-Input Coupler (Item 6)
See
ADJUSTMENT LOCATIONS 1
a t the back o f this m anual for test points and adjustm ent locations.
INITIAL CONTROL SETTINGS
PROCEDURE STEPS
Vertical (Both Channels)
1. Adjust Trigger Offset (R309)
POSITION
Midrange
a. Set the Channel 1 trace and the Channel 2 trace to
VERTICAL MODE
BOTH-ALT
the center horizontal graticule line using the Channel 1 and
BW LIMIT
Off (button out)
Channel 2 POSITION controls.
VOLTS/DIV
0.5 V
VOLTS/DIV Variable
CAL detent
INVERT
Off (button out)
b. Connect the digital voltmeter low lead to chassis
Input Coupling
GND
ground and the high (volts) lead to W4000-1 (Alt Sweep
Logic circuit board connector to the Main circuit board).
Horizontal
c. CHECK—The offset voltage reading is less than 80
POSITION
Midrange
mV. Note the reading for use in part e.
HORIZONTAL MODE A
A and B SEC/DIV
1 ms
SEC/DIV Variable CAL detent
d. Set the A&B INT switch to CH 1.
X I0 Magnifier
Off (knob in)
B DELAY TIME POSITION
Fully counterclockwise
e. ADJUST—Trigger Offset (R309) so that the voltage
reading is the same as that obtained in part c.
B TRIGGER
SLOPE
OUT
f. Set the A&B INT switch to CH 2.
LEVEL
A I l i l / H A C n
Midrange
g. Repeat parts c through f until there is 1 mV or less
difference in the voltmeter readings between the CH 1 and
A TRIGGER
CH 2 positions of the A&B INT switch.
VAR HOLDOFF
NORM
Mode
P-P AUTO
2. Adjust Trigger Sensitivity (R479) and (R627)
SLOPE
OUT
LEVEL
Midrange
a. Set:
A&B INT
CH 2
A SOURCE
INT
VERTICAL MODE CH 1
A EXT COUPLING
DC
CH 1 VOLTS/DIV 0.1 V
AC-GND-DC (both) AC
A and B SEC/DIV 10
ns
REV JUL 1984 5-19
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