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Tektronix 2445A - Page 83

Tektronix 2445A
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f.
Change
CH
1 Input Coupling to
50
þÿ© 
DC.
g.
VERIFY-For
a period
of
one minute, the readout
display does not indicate any overload condition
(50
þÿ© 
OVERLOAD).
h.
Change the
CH
1 VOL TS/DIV control to 5 V
and
the
CH
1 Input Coupling to 1
þÿM© 
DC.
i.
Increase the Power Supply output
level
until the
CH
1
trace rises to the center graticule line (
+ 20
V).
To
prevent damage to
the
input circuitry
when
in
50
þÿ© 
DC,
the 20 V source must
not
be applied to the
CH
1
OR
X
or
CH 2 input connectors for longer than
15
seconds.
If
the automatic OVERLOAD switching
does
not
occur within
15
seconds, turn the Power
Supply
off
immediately.
j.
Set
the
CH
1 Input Coupling to
50
þÿ© 
DC.
k.
VERIFY-Within
15
seconds
after
CH
1 input cou-
pling
is
set to
50
þÿ© 
DC,
the readout display indicates 50 þÿ© 
OVERLOAD, the
CH
1 Input Coupling changes to 1
þÿM© 
GND
automatically,
and
the trace returns to the
bOttom
horizontal graticule line.
I.
Turn the Power Supply Off.
m.
Disconnect the Power Supply from
CH
1 input.
n.
Clear the OVERLOAD condition
by
pressing the
upper
CH
1 Input Coupling button.
o.
VERIFY-
The
CH
1,
1
þÿM© 
DC
indicator is lit
and
the
readout display
no
longer indicates
50
þÿ©  OVERLOAD.
p.
Set the VERTICAL MODE buttons to display Chan-
nel
2
and
repeat parts a through o to verify 50 þÿ©  OVER-
LOAD protection for
Channel
2.
Performance
Check-2445A/2455A
Service
2. Check
CH
1 and
CH
2 Low-Frequency AC
Coupling.
a.
Set:
NOTE
Select channels to set
VOL
TS/DIV.
VOLTS/DIV
CH
1
and
CH
2
VERTICAL MODE
CH
1
CH
2
Input Coupling
CH1andCH2
HORIZONTAL
A SEC/DIV
100mv
On
Off
1
þÿM© 
GND
10
ms (knob
in)
b.
Connect the CALIBRATOR output signal to the
CH
1
OR
X input connector using a 1 X probe.
c.
Position the ground-reference trace 2 divisions below
the center horizontal graticule line.
d.
Set the
CH
1 Input Coupling to 1
þÿM©
DC.
e.
CHECK-Displayed signal is vertically centered
and
has
an
amplitude of 3.88 to 4.12 divisions.
f.
Set the Channel 1 Input Coupling to the upper 1
þÿM©
GND
position.
g.
Using the
CH
1 POSITION control, align the trace
with the center horizontal graticule line.
h.
Set the
Channel
1 Input Coupling to 1
þÿM©
AC.
i.
CHECK-Displayed signal
is
a tilted square
wave,
4.36 to 5.37 divisions
in
amplitude, vertically centered
on
the graticule.
4-5

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