Performance
Check-2445A/2455A
Service
b.
Connect a 1-kHz,
2-V
standard-amplitude signal from
the Calibration Generator to the
CH
1
OR
X input connec-
tor
and
the rear-panel
EXT
Z-AXIS input connector using a
50-0 BNC T-Connector
and
two 50-0 BNC cables.
c.
CHECK-The
positive portion of the
4-ctivision
signal
display is blanked out.
d.
Disconnect the test setup
and
adjust the CRT
INTENSITY
as
desired.
3. Check A and B GATE Outputs and Verify
TRIGGER HOLDOFF.
a.
Set:
A SEC/DIV
B SEC/DIV
At
100
µ.S
50
µ.s
(knob
in)
Off (DL Y readout)
AUTO
TRIGGER MODE
TRIGGER HOLDOFF
A
REF
OR
DLY
POS
Minimum (CCW)
Zero
DLY
readout
4-36
NOTE
On CTT instruments, rotate
the
..::1
REF
OR
DL
Y
POS control for the specified
delay.
As
the
con-
trol is rotated, the readout delay
value
will be fol-
lowed
by
the word "SET", denoting the indirect
measurement mode. A few seconds after control
movement has stopped, the word •
SET" will
disappear and the readout will display
the
direct
measurement from
the
CTT.
b.
Connect a test oscilloscope
to
the A GATE OUT
connector (located
on
the instrument rear panel)
via
a 50-0
BNC
cable.
c.
CHECK-
Test oscilloscope displays a signal with a
high
level
between 2.4 V
and
5
Vanda
low
level
between
0 V
and
0.4
V.
d.
VERIFY-Duration of the high
level
is
between 1 ms
and
1.2
ms.
e.
VERIFY-Duration of the low
level
is
between 80
µ.s
and
150
µ.s.
f.
VERIFY-Duration of the low
level
increases to at
least 1
O times the time measured
in
part e when the
HOLDOFF control
is
rotated to the maximum
CW
position
but not
in
the detent.
g.
Move the 50-0 BNC cable from the A GATE OUT
connector
to
the B GATE OUT connector.
h.
CHECK-
Test oscilloscope displays a signal with a
high
level
between 2.4 V and 5 V
and
a low level between
0 V
and
0.4
V.
i.
VERIFY-Duration
of
the high portion of the signal is
between
500
µ.s
and
600
µ.s.
j.
Disconnect the test setup.
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