Line Trigger Source - Tektronix 7B51 Instruction Manual

Performance Check/Calibration-Type 7851
--+---t--- --
f--
-- -- 1-----
+---+---+----+----1--
---- - - ----+--+---
1----1---
- - - f -
--t----+----I---
f---- -
---1----
+----+---\---+-
- 1--- - f-----
Fig.5·t1. Typical CRT display showing delay time jitter.
b. Apply 1 ms markers from the time-mark generator.
Position the eleventh marker near the center of the display
with the DELAY TIME MULTIPLIER.
c. CHECK-Jitter on the leading edge of the pulse does
not exceed 1 division (1 part in 50,000 of 10 times the
TIME/DIV setting). See Fig. 5-11. Disregard any slow drift.
5-14
d. Disconnect the time-mark generator.
23. Check Line Trigger Source
a. Change the following control settings:
TRIGGERING
MODE
COUPLING
SOURCE
TIME/DIV
Volts/div
AC-Gnd-DC
Type 7851
Type7A16
NORM
AC
LINE
5 ms
1V
AC
b. Connect a 1 X probe from the Type 7 A 16 input to
interface connector A4 (plug-in connector at the rear of the
Type 7851).
c. CHECK-For stable triggering of the proper polarity
at 0/+ and 0/- of the LEVEL/SLOPE control.
d. Disconnect all test equipment.