Tektronix 2247A

Introduction
The detachable three-wire power cord has a three-contact plug for con-
nection to the power source and the protective ground. The power cord is
held to the rear panel by a clamp. The protective ground contact on the
plug connects (through the power cord protective-ground conductor) to
the accessible metal parts of the instrument.
WARNING
For electrical-shock protection, insert this plug into a power-
source
outlet
that
has
a
properly
grounded
protective-ground
contact.
Instrument Cooling
To
prevent
Instrument
damage
from
overheated
components,
make
sure
the
internal
airflow
is
not
blocked.
Before
turning
on
the
power,
check
that
the
ventilation
holes
on
the
bottom
and
side
of
the
cabinet
are
not
covered.
Start-up
At
power
on,
the
instrument
does
a
self-diagnostic
check.
If
the
instrument
does
not
turn
on
and
operate
normally,
turn
power
off
then
on
again.
If
the
Instrument
still
does
not
turn
on
properly,
refer
the
Instrument
to
a
qualified
service
person.
TRIGGER
MODE
LEDs
may
be
flashing
to
Indicate
the
clr-
cuit
location
of
a
start-up
error;
you
should
report
this
information
to
the
service
person,
When
the
Instrument
Is
turned
on,
a
self-cal
routine
may
run
to
set
the
voltage-
and
timing-measurement
constants.
The
power-on
self
cal
runs
only
if
the
stored
constants
have
been
lost,
possibly
due
to
a
dead
memory
back-up
battery.
The
following
warning
message
will
be
displayed
for
5
seconds:
“WARNING
PROBABLE
BATTERY
FAILURE
TURN
OFF
AND
ON
TO
VERIFY".
If
the
message
reappears
after
having
turned
the
power
off
and
on,
have
the
battery
checked
and/or
replaced
by
a
qualified
service
person.
The
Instrument
can
still
be
used
for
accurate
measurements
by
running
the
SELF
CAL
MEASUREMENTS
routine
from
the
SERVICE
MENU
after
the
Instrument
has
warmed
up
for
at
least
20
minutes.
To
run
the
SELF
CAL
MEASUREMENTS
routine,
press
the
top
and
bottom
menu-item
select
buttons.
Press
down-arrow
button
to
underline
SELF
2247A Operators