Performance Check-2445A/2455A Service
m.
VERIFY-5
traces are alternately displayed
in
the
following sequence:
CH
1,
CH
2,
ADD,
CH
3,
CH
4.
n.
Set the TRIGGER MODE to SGL SEQ.
o.
VERIFY-After
the current sequence of traces is
complete, no further traces are displayed.
p.
Set the TRIGGER SOURCE
to
LINE.
q.
Press
and
release the lower TRIGGER MODE
button.
r.
VERIFY-Each
time the lower TRIGGER MODE but-
ton
is
pressed and released, the 5 signal traces appear
once
(in
sequence), the readout display flashes once
and
the scale illumination flashes on
and
off.
s.
Set the TRIGGER MODE
to
AUTO LVL
and
press
the CHOP button.
t.
VERIFY-The
5 traces appear
to
be
displayed
simultaneously.
u.
Set:
TRIGGER SOURCE
A SEC/DIV
B SEC/DIV
CHOP/ALT
TRACE
SEP
CH
4
20
µS
1 0 µs (knob out)
ALT
CCW until traces
are separated
v.
VERIFY-An
alternate B sweep trace appears for
each A sweep trace (10 traces total).
2. Verify BEAM FIND Operation.
a.
Set:
HORIZONTAL
POSITION
A SEC/DIV
X10 MAG
VERTICAL
CH
1
CH
2,
CH
3,
CH
4
and
ADD
POSITION
Midrange
1
ms
(knob
in)
On
On
Off
Midrange
b.
Press
and
hold the BEAM
FIND
button.
4-38
c.
VERIFY-The
trace is less than
10
divisions long
and
remains
in
the graticule area as the
CH
1 POSITION
control
and
the Horizontal POSITION control are rotated
through their complete ranges.
d. Release the BEAM FIND button
and
set the VERTI-
CAL POSITION
and
Horizontal POSITION controls
to
midrange.
3. Check Probe Encoding.
NOTE
Refer to instrument ·operators Manual", for the
positioning
of
the readout display information.
a.
Set:
CH
1,
CH
2,
CH
3,
CH
4 VERTICAL MODE
On
CH
1
and
CH
2
VOL TS/DIV 100
mV
CH
3
and
CH
4
VOL TS/DIV
0.1
b.
Connect the standard accessory 1
OX
probe
(encoded)
to
the
CH
1 input connector.
c.
CHECK-CH
1 readout changes from 100
mV
to
1
V.
d.
Move the probe
to
CH
2
and
repeat part c for that
channel.
e.
Move the probe to
CH
3.
f.
CHECK-Readout
changes from
0.1
to
1.
g.
Move the probe
to
CH
4
and
repeat part f for that
channel.
h.
Disconnect test setup.
i.
Short a probe coding ring to ground.
j.
CHECK-Readout
changes
to
ID
for that channel
and
the trace jumps up approximately 0.5 divisions.
k.
Repeat steps i
and
j for
each
VERTICAL channel.
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