Tv Field Trigger Sensitivity.7-34; Tv Line Trigger Sensitivity - Tektronix 2245A Operator's Manual

Performance Check Procedure
g. CHECK—that the CH 1 signal display amplitude Is four divisions or
more (peak-to-peak). Note that the signal is not triggered.
h. Disconnect the test setup from the 2245A.
7. TV Field Trigger Sensitivity
a. Set:
VERTICAL MODE
CH 2 VOLTS/DiV
SEC/DIV
TRIGGER SLOPE
TRIGGER MODE
CH 2 (CH 1 off)
t V
0.2 ms
-\_ (negative-going)
TV FIELD
b. Connect TV signal generator video output to the CH 2 Input via a 50
BNC cable.
c. Set CH 2 VAR VOLTS/DIV control for a 0.5 division composite sync
signal.
d. CHECK—that a stable display is obtained.
e. Set:
CH 2 INVERT On
TRIGGER SLOPE ~T (positive-going)
f. CHECK—that a stable display is obtained.
8. TV Line Trigger Sensitivity
a. Set:
CH 2 INVERT
TRIGGER SLOPE
A SEC/DIV
Horizontial MODE
B SEC/DIV
A/B SELECT
TRIGGER MODE
b. CHECK—that a stable display Is obtained for various portions of the TV
FIELD as the N- OR DELAY control is rotated.
OFF
"\_ (negative-going)
2 ms
B
20 |J.s
B
TV LINE
7-34
2245A Operators