SECTION
5
CALIBRATION
PROCEDURE
INTRODUCTION
Inf
or
mation con
t
ained
in
this section is
provided
as
an aid to
recalibr
ati
ng
and checking
the op
e
ration of the Type
CA Plug-In U
ni
t. In
add
i
tion, this section may be used to isolate
troubles
occuring w
i
thin the unit.
A
ppar
ent troubles
in the un
i
t
are
often the
result
of improp
e
r
calibration of one
or more
circuits.
C
ons
equen
t
ly,
calibration checks
should
be an in
t
eg
r
al
part of the troublesho
ot
ing
procedure.
A
bnor
mal
indications
occuring
during calibration
checks
w
i
ll
often aid in
isolating troubles to a
definite circuit or stage.
In
the
instructions that follow, the steps
are arr
a
nged
in the
prope
r
sequence
for a
comp
l
ete
recalibra
ti
on
of the instrument. Each
numbered step contains the
information required
to make one check, one adjus
t
men
t
,
or a series
of
related adju
s
tmen
t
s or checks.
The steps
are arr
a
nged
so
that u
nnecess
ary repeti
ti
on
of
certain checks is avoided.
In each calibration step only the
required
information
is given. Detailed instructions per
taining
to
normal operation
of the instrument
are
not included. If you are in
doubt as to
the
proper operation of
controls, refer to
the Operating
Instructions.
Controls
not mentioned in a particular cal
ibration
step are assumed to be in the positions
they
were
in
during the previous step. All
test
equipment
used in any particular step
should
be disconnected at the end of the step
unless
you
are
instructed to the contrary.
If
a
single control requires
adjustment, it
can be adjusted in the applicable step of this
procedure without performing other steps as
well. It will
be necessary, however,
that you
refer
to the
calibration steps immediately pre
ceding
the
adjustment you wish to
make to
determine the
proper settings
for the controls
not
mentioned
in that step.
If
you
suspect
that the unit is out of cal
ibration but you
are not aware of which par
ticular adjustment
will correct the difficulty,
it
is usually best to run through the
entire
calibration
procedure. In this way you can
be certain
that the unit is properly calibrated
without resorting
to a method of
random
experimentation.
EQUIPMENT
REQUIRED
The
following equipment or its equivalent
is
required to perform a complete calibration
of
the
Type CA Plug-In Unit.
1.
Tektronix
540-Series convertible
oscillo
scope or equivalent.
2. DC voltmeter
with sensitivity
of at least
20,000-ohms
per
volt.
3.
Ohmmeter.
4. Type
190 or 190A
constant-Amplitude
Signal
Generator
or equivalent, providing constant
amplitude sine waves from about 50 kc to
30 me with
output
amplitude constant within
+ or-
2%.
5. Type 105 Square-Wave
Generator or equiva
lent
with frequency range of about 25 cycles
to
1 m
c, risetime at
least
.02 microseconds
and
frequency indication accuracy of no
poorer
than +or-
3%.
6.
Type 107 Square-Wave
Generator
or
equiva
lent with frequency
range of 400 kc to 1 me,
peak-to-peak
output
voltage of
at
least 0.1
to
.5 volts, and risetime of 3 nanoseconds
or
less.
AA
Calibration -
Type
CA
5-1