Performance Check Procedure
22. Vertical ALT and CHOP Modes
a.
Set:
VERTICAL MODE
CHOP VERTICAL MODE
CH 1 and CH 2
VOLTS/DIV
CH 3 and CH 4
VOLTS/DIV
CH 1 and CH 2 Input COUPLING
Horizontal MODE
SEC/DIV
TRIGGER MODE
0.1 V
DC
A
0.1 ms
AUTO LEVEL
CH 1, CH 2, CH 3, CH 4 On
Off (ALT mode)
10 mV
b.
Position all traces for two divisions of separation with the CH 1 trace
near the top: then in order down the graticule area with the CH 4 trace
near the bottom.
c.
Set SEC/DIV to 10 ms.
d.
CHECK—that four traces are sweeping across the screen alternately.
e.
Set CHOP VERTICAL MODE On.
f.
CHECK—that four traces are sweeping across the screen simultane
ously.
23. BEAM FIND Functional Check
a.
Push BEAM FIND in and hold.
b.
CHECK—the signal is visible and compressed fully within the graticule
area as the horizontal and vertical position controls are rotated through
their ranges.
c.
Release the BEAM FIND button.
d.
Set all Vertical and Horizontal POSITION controls at the 12 o'clock po
sition.
7-26
2245A Operators
