ADJUSTMENT
PROCEDURE
General
The
following
adjustment
procedure is
based
on
that used
in
our own
test
department.
Normally,
it
will
not
be
necessary
to
make
all of
these
adjustments at
any
one
time
after
the original
calibration
of
the
instrument.
How
ever,
any adjustments which
are
to be
made
should
be
made
in the sequence
given
below.
For
instance
the
crt-supply
voltage
should
not
be
set
before
the
-150-
volt
supply
is
adjusted
as
a
change in
the
latter
will
change
the
first
adjustment.
Similarly,
the
vertical
sensitivity
should
not be
set
until
after
the
crt-supply
voltage
is
set.
Equipment
Required
The
following
equipment
is
necessary
for
a
complete
calibration
of
the
Type
515/515A
Oscilloscope:
(1.)
A DC
voltmeter
having
a
sensitivity
of
at
least
5000
f2/v and calibrated
for
an
accuracy
of
at
least
1% at 100,
150
and
300
volts,
and
an
accuracy
of
at
least
3%
at
1675
volts.
Portable
multimeters
should be
regularly
checked
against an
accurate
standard
and
corrected
readings
noted,
where
necessary,
at
the
above
listed
voltages.
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. Power
stat
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
gsec, 10
gsec,
50
gsec,
100
gsec, 1
msec,
ON
5
RECALIBRATION
PROCEDURE
5
msec,
10
msec,
100
msec,
1
sec, and
5
sec
and
a
sine-wave
output
of 10
me,
all
having
an
accuracy
of
at
least
1%.
(5.)
Square-Wave Generator, Tektronix
Type
105
or
equivalent,
having
a
risetime
of no
more
than
.02
microseconds
and
a
frequency
of
1 kc.
(6.)
Low-capacitance
Recalibration
Tools:
Tektronix
part
numbers
003-000,
003-007 and
003-301.
(7.)
Tektronix
Type
P6000
or
P410A
probe.
(8.)
Test
Oscilloscope,
Tektronix
Type
316
or
equivalent,
providing
triggered
sweeps and
a
bandpass
of
at least
de
to
10
me.
Power
Supply
All
power-supply
voltages
except
the
crt
voltages
are available
at
the
ceramic
strip
behind
the
power
transformer.
The
10-ohm
resistors
are
ahead
of the regulators
and
the
bare
wires
carry
the
regulated voltages.
1.
-150-Volt
Supply Adjustment
The
-150-volt
supply is
the one
to
which
all
other
supplies
are
referenced.
a.
Connect an
accurate
voltmeter
to
the
-150-
volt
bus.
b.
Adjust
the
-150
ADJ.
control,
located
behind
the
delay
line,
to
obtain
a
reading
of
-150
volts.
2. CRT-Supply
Adjustment
This
adjustment
determines
the
total accel
erating
voltage
on
the
crt and
thus
affects
the
deflection
sensitivity.
AA
Recalibration
Procedure - Type
515/515A
5-1