j.
CHECK-
Trace is within 2 divisions
of
the ground
reference set above (discount trace width).
k. Disconnect the test setup.
10. Check BW Limit Operation.
a.
Set:
VER"rlCAL
CH
1
CH
2
BW LIMIT
CH
2 VOL TS/DIV
CH
3 Input Coupling
HORIZONTAL
A SEC/DIV
Off
On
On
10mV
50 0
50
µS
(knob in)
Performance
Check-2445A/2455A
Service
b.
Connect the Primary Leveled Sine-Wave Generator
output to the
CH
2 input connector via a precision 50 o
BNC cable.
c.
Set the generator frequency
to
50 kHz and adjust
the output level for a 6-division display on the CRT.
d. Gradually increase the generator output frequency
until the display amplitude decreases to
4.24 divisions.
e.
CHECK-Generator
frequency is between
13
MHz to
24 MHz.
f.
Turn BW LIMIT off.
g. Disconnect the test setup.
4-15
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