Tektronix 545A Instruction Manual page 71

Calibration
Procedure
—
Type
545A
waveform.
It
is
important that
you
adjust
each
pair of
inductors
in
conjunction with
each
other.
Each
inductor
should be
set at
the
same
position as
its
corresponding-
opposite inductor.
Adjust the inductors,
in
pairs for
the squarest possible
corner.
It
may
be necessary
to
readjust the
first
two
or
three capacitors closest to the
crt in
order
to
achieve
a
wrinkle-free corner.
At
this
time the
displayed
waveform
should be
level
on
top, there
should be
virtually
no
bumps
or wrinkles,
and
the
risetime of the
displayed
waveform
should be within
specifi-
cations for
the instrument.
A
risetime
check on the
dis-
played
waveform
gives
a very
good
check on
the
complete-
ness of the adjustments.
BANDPASS CHECKS
Install
a properly calibrated
Type K
Unit
in
the oscillo-
scope
and connect
the
output cable from
the Constant-
Amplitude Signal
Generator
to
the
INPUT
Connector of the
Type K
Unit.
Set the front-panel controls as follows:
STABILITY
full
right
TRIGGERING
LEVEL any
position
TRIGGER SLOPE
INT. (+ or
-)
TRIGGERING
MODE AC
LF REJECT,
AC
or
DC
TIME/CM
1
MILLISEC
VARIABLE CALIBRATED
HORIZONTAL
DISPLAY
A
Type K
Unit
AC/DC DC
VOLTS/CM
.05
VARIABLE CALIBRATED
Set
the frequency
controls
on
the Signal
GENERATOR
for
an
output frequency of 500
kc,
and
adjust the
amplitude
controls
for
a
vertical
deflection of exactly 4 centimeters.
Position the display on
the
crt
(with the
VERTICAL
POSI-
TION
control)
so that the deflection extends
exactly
from
the
top
graticule
mark
to
the
bottom
graticule mark.
Then
increase the output frequency
of the Signal
Gen-
erator
to
30
me
(make
sure the
VOLTS/CM
and VARIABLE
controls
are
set to .05
and CALIBRATED,
respectively);
the deflection
should
be
at
least
2.8 centimeters
at
30 me.
If
not, the Vertical
Amplifier
and
the
Delay
Line
(and
pos-
sible
the
Type K
Unit)
are
in
need
of further adjustment.
©1
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