Calibration Procedure; Accessories; Type - Tektronix 545A Instruction Manual

CALIBRATION
PROCEDURE
The Type 545A
Oscilloscope
is
a stable instrument
and
should not require frequent calibration.
However,
it
will
be
necessary
to
calibrate certain parts of the instrument
when
tubes or
components
are
changed,
and
periodic
cali-
bration
is
desirable from the standpoint of preventive main-
tenance.
In
the instructions that follow, the steps
are arranged
in
the
proper sequence
for
full
calibration.
Each
numbered
step contains the information necessary
to
make
one
adjust-
ment.
If
a complete
calibration
is
not necessary,
you
may
perform
individual steps,
PROVIDING
that the steps per-
formed do
not
affect
other adjustments.
It is
most import-
ant
that
you
are
fully
aware
of the interaction of adjust-
ments.
Generally speaking,
the interaction of controls
will
be apparent
in
the
schematic diagrams.
If
you
are
in
doubt,
check
the calibration of the entire section
on which you
are
working.
If
you
make any
adjustments on
the
power
supplies,
you
will
have
to
check
the calibration of the entire instrument.
In
particular the
sweep
rates
and
vertical
deflection factors
must be checked.
(5.)
Square-Wave
Generator,
Tektronix
Type 107
or
equivalent,
having
a risetime
of
no more
than 7 nano-
seconds,
and a frequency
of
approximately 500
kc.
The
top
of the
square-wave must be
free of overshoot
and
wrinkles.
A
Tektronix
Type
P Unit
may
be used
in
place
of the
Type
107.
A
Type P52 Coaxial Cable
and
a
Type B52R
Terminat-
ing Resistor
is
required with the
Type
107.
6.
)
Tektronix
Type K
or
Type
L
Plug-In
Unit.
(If
delay-line
adjustment
is
not required, other
Tektronix
Plug-In Units
may
be
substituted.)
7.
)
Low-Capacitance
Recalibration Tools: Tektronix part
numbers
003-000,
003-007
and
003-301. (See Recalibration
Tools
in
Accessories Section of
Operator's
Manual and
Fig. 6-11).
(8.)
Tektronix Type P6000 or
P410A
Probe.
(9.)
Test Oscilloscope, Tektronix
Type 316
or equivalent,
providing triggered
sweeps and
a bandpass
of
at
least
dc
to
10 me.
(10.)
Gain
Set
Adapter,
Tektronix
Type
EP53A.
EQUIPMENT REQUIRED
The
following
equipment
is
necessary
for
a complete
calibration of the
Type 545A
Oscilloscope.
(1.)
A DC
voltmeter
having a
sensitivity of at least
5000
L2/v
and
calibrated for
an accuracy
of at least
1
%
at
100, 150, 225,
350
and 500
volts,
and
for
an accuracy
of at
least
3%
at
1350
volts.
Portable multimeters should
be
reg-
ularly
checked against an accurate standard
and
corrected
readings noted,
where
necessary, at the
above
listed
volt-
ages.
BE
SURE
YOUR
METER
IS
ACCURATE
(2.)
An
accurate rms-reading ac voltmeter, having a range
of
0-150
volts.
(0-250
or 0-300
for
234
v.
operation).
(3.)
Variable auto-transformer
(e.g.
Powerstat
or Variac)
having a
rating of at least 6.25
amperes.
(4.)
Time-Mark
Generator, Tektronix
Type
180,
180A
or
equivalent, having markers
at
1
^.sec,
lOfisec, 50
/xsec,
100
/j.
sec,
1msec, 5 msec, 10 msec,
100 msec,
1
sec,
and
5 sec
and
sine-wave
outputs of 10
me and
50 me,
all
having an
accuracy
of at
least
1%.
Fig.
6-1.
Suggested Calibration
Tools.