Performance Check-2445A/2455A Service
COUNTER/TIMER/TRIGGER CHECKS
This section contains the portion
of
the Option 06 (Counter/Timer/Trigger) performance check procedure that directly
affects operation
of
the horizontal timing modes. If your instrument does not contain this option, continue with the Horizon-
tal checks.
Test equipment listed in Table
4-1
is required to perform this procedure.
To
assure accurate measurements, it is impor-
tant that test equipment used
for
making these checks meet
or
exceed the specifications described in Table
4-1
for CTT
checks.
INITIAL CONTROL SETTINGS
Control settings not listed
do
not
affect the procedure.
NOTE
Select channels
to
set
VOL TS/DIV.
VERTICAL
CH 1 and CH 2
VOLTS/DIV
CH
1 and CH 2 VAR
CH
3 and CH 4
VOLTS/DIV
CH
1
CH 2, CH 3,
CH
4,
ADD, and INVERT
CHOP/ALT
20
MHz
BW
LIMIT
CH
1 and CH 2
Input Coupling
HORIZONTAL
A SEC/DIV
SEC/DIV VAR
X10
MAG
TRACKING
TRACE SEP
Delta
At
and
AV
TRIGGER
HOLDOFF
A and B LEVEL
SLOPE
A MODE
SOURCE
COUPLING
BMODE
CTT and
WR
Options
MENU Functions
4-28
500mV
In detent
0.1
V
On
Off
ALT
Off
500
DC
10
ns (knob in)
In detent
Off
Off
Fully
CW
Off (press and release
until associated
readout is Off)
Fully CCW
Midrange
+ (plus)
AUTO LVL
VERT
DC
RUN AFT DLY
OFF
1. Check Maximum Input Frequency
at
Minimum
Sensitivity.
a.
Connect the leveled sinewave generator
output
via a
50-!l cable
to
the
CH
1 input connector.
b.
Set
generator
to
produce a 150-MHz, 4 division
display.
c. Push the
NB
MENU button
to
enter MENU mode.
d.
Tum
either A control
to
underline COUNT.
e.
Push the upper TRIGGER
MODE
button.
f.
If the instrument contains Option
09
(Word Recog-
nizer), turn the
A REF OR
DL
Y POS control
to
underline
MODE.
g.
Tum
the A control
to
underline FREQ.
h. If the instrument contains Option 09 (Word Recog-
nizer), turn the
A REF OR
DL
Y POS control
to
underline
EVT.
i.
If the instrument contains Option 09 (Word Recog-
nizer), turn the
A control
to
underline event
A.
j. Push the upper TRIGGER MODE button
to
enter Fre-
quency mode.
k. Push the upper TRIGGER
MODE
button
to
reinitial-
ize the auto-trigger level.
I.
CHECK-Reading
is between 149 MHz and 151 MHz
and is stable.
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