Tv Field Trigger Sensitivity; 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
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
TRIGGER SLOPE
f. CHECK—that a stable display Is obtained.
8.

TV Line Trigger Sensitivity

a. Set:
CH 2 INVERT
TRIGGER SLOPE
A SEC/DIV
Horizontlal 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 K- OR DELAY control is rotated.
7-34
CH 2 (CH 1 off)
1 V
0.2 ms
(negative-going)
TV FIELD
On
(positive-going)
OFF
(negative-going)
2 ms
B
20 jj.s
B
TV LINE
2245A Operators
Cl