2. Check Minimum Sensitivity at 50 MHz.
a.
Set the generator to produce a 50.0-MHz, 1.3-
division display.
b.
Push
the upper TRIGGER MODE button to
reinitialize the auto trigger
level.
c.
CHECK-Reading
is
between 49.9
MHz
and
50.1
MHz
and
is
stable.
d.
Disconnect the test equipment from the instrument.
3. Check Frequency Accuracy.
a.
Connect the time-mark generator output
via
a 50-0
cable to the
CH
1 input connector.
b.
Set the generator
to
produce 10-ns time markers
four divisions in amplitude using
CH
1 VOL TS/DIV and
VAR
VOLTS/DIV.
c.
Push
the upper TRIGGER MODE button to reinitial-
ize the auto-trigger
level.
d.
CHECK-Reading
is
between 99.9995 MHz and
100.0005 MHz.
4. Check Minimum Input Frequency.
a. Set the time-mark generator to produce 2-s time
markers.
b.
Set:
CH
1 VOL TS/DIV
A TRIGGER MODE
A SEC/DIV
100
mV
NORM
50
ms
(knob
in)
c.
Adjust the A TRIGGER LEVEL control for a stable
trigger.
d. CHECK-Reading
is
between 499.9975
mHz
and
500.0025 mHz.
e.
Disconnect the test equipment from the instrument.
Performance
Check-2445A/2455A
Service
5. Check Delay Time.
a.
Set:
CH
1 VOL TS/DIV
CH
1 Input Coupling
A SEC/DIV
A TRIGGER MODE
500
mV
GND
20
ns
(knob
in)
AUTO
b.
Connect the output
of
the time-mark generator via a
50-0 cable to the positive trigger input
of
the pulse
generator.
c.
Connect the output of the pulse generator via a 50-0
cable to the
CH
1 input connector.
d.
Set the time-mark generator to produce 20-ns time
markers.
e.
Set the pulse generator
to
produce a positive 5-ns
pulse when externally triggered.
f.
Adjust the
CH
1 POSITION control to center the
Channel 1 display.
g.
Set the
CH
1 Input Coupling
to
50 o
DC
.
h.
Adjust the pulse generator to produce a 5-clivision
peak-to-peak display, centered about ground.
i.
Adjust the A TRIGGER LEVEL for a readout of
0.00
v.
j.
Pull
out the SEC/DIV knob.
k.
Push
the A/8
MENU
button.
I.
Set the B TRIGGER MODE to TRIG AFT DLY,
SOURCE to
VERT,
COUPLING to
DC,
and
SLOPE to
+.
m.
Adjust the B TRIGGER LEVEL for a readout of
0.00
V.
n.
Turn the
~
REF
OR
DL Y
POS
control counterclock-
wise
until the intensified zone stops moving to the left.
4-29
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