Performance
Check-2445A/2455A
Service
e.
Set the TRIGGER COUPLING
to
NOISE REJ.
f.
CHECK-Display
will not trigger (freeruns).
g. Pull the SEC/DIV knob out, rotate it
to
5
µS
and
push it back
in.
h.
Press the A/B TRIG button
to
select the B
TRIGGER.
i.
Set the TRIGGER MODE
to
B TRIG AFT DL
Y.
j. Set TRIGGER COUPLING
to
NOISE REJ.
k.
CHECK-Display
will not trigger for any setting
of
the LEVEL control.
I.
Rotate the SEC/DIV back
to
10
µS
(knob
in).
m.
Move the input signal
to
CH
2,
CH
3, and
CH
4 in
turn, selecting each channel as the display source. Repeat
parts f through k for each channel.
4-20
4. Check Slope Selection and Verify Line Trigger.
a.
Set:
VERTICAL
CH
1 VOL TS/DIV
CH
1 Input Coupling
CH
1
CH
2,
3, 4
HORIZONTAL
A SEC/DIV
X10 MAG
TRIGGER
MODE
SOURCE
COUPLING
5V
1
MO
DC
On
Off
2 ms (knob in)
Off
AUTO
LINE
AC
~
In
the
next part, DO NOT connect
the
probe
ground lead to
the
ac power source.
b. Attach the 1
OX
probe
to
the
CH
1
OR
X input con-
nector and connect the probe tip
to
the ac
power
source.
c.
CHECK-Display
can be triggered
in
both the +
(plus) and - (minus) positions of the SLOPE switch using
the TRIGGER LEVEL control and that the displayed slope
agrees with the selected slope.
d.
CHECK-Display
phase shifts slightly as the
TRIGGER COUPLING is changed from AC
to
DC.
e.
Disconnect the test setup.
To Next Page
Loading...
