TB 9-6625-2139-24
NOTE
Ensure CH 2 VOLTS/DIV is set to 5m.
(12) Set oscilloscope calibrator LEVEL SINE output to 10 MHz and approximately
17 mVpp for 3.5 divisions (3.0 divisions for type 2235) of vertical display on TI.
(13) Set CH 2 VOLTS/DIV switch to 50m.
(14) Set TI A TRIGGER pushbutton to first row listed in table 18 and adjust A
TRIGGER LEVEL control to obtain a stable display. If a stable display cannot be
obtained, perform adjustments listed in table 18.
(15) Repeat technique of step (14) above for remaining A TRIGGER pushbutton
combinations listed in table 18. If a stable display cannot be obtained for each combination,
perform adjustments list in table 18.
Table 18. A Trigger Level Channel 2
Test instrument
Test instrument
Test instrument
A TRIGGER
A TRIGGER LEVEL
adjustments
pushbutton combinations
stable display test
MODE
SLOPE
b
Yes
No
b
NORM
IN:
b
P-P AUTO
IN:
b
P-P AUTO
OUT:
(16) Set HORIZONTAL MODE switch to B.
Adjust B INTENSITY control for
suitable viewing.
(17) Verify a stable display can be obtained by adjusting B TRIGGER LEVEL
control in a position other than B RUNS AFTER DLY; if not, perform b below.
(18) Press B TRIGGER SLOPE pushbutton to IN and verify a stable display can be
obtained by adjusting B TRIGGER LEVEL control in a position other than B RUNS
AFTER DLY; if not, perform b below.
(19) Position controls as listed in (a) through (f) below:
(a) VERTICAL MODE CH 1 BOTH CH 2 switch to CH 1.
(b) VERTICAL MODE TRIGGER SOURCE CH 1 and CH 2 pushbuttons to
COMPOSITE (AN/USM-488).
(c) HORIZONTAL MODE switch to A.
(d) A AND B SEC/DIV switches to .1 Ps.
(e) B TRIGGER SLOPE pushbutton to OUT.
(f) A TRIGGER A&B INT switch to VERT MODE (type 2235).
(20) Connect oscilloscope calibrator CHAN 1 to TI CH 1 using a 50 :
feedthrough termination.
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