TM
11-6625-2981-14
of
the
guard
circuit
reduces
the
indicated
leakage,
then
the
insulator
must
be
cleaned.
The
hand-cranked
is
a
regulated
power
supply.
As
soon
as
the
crank
is
turned
at
about
160
rpm,
any
further
increase
in
speed
will
have
no
effect
on
the
reading.
Thus,
the
proper
cranking
speed
can
easily
be
determined
by
finding
that
speed
above
which
the
meter
reading
does
not
change.
PROCEDURES
FOR
SETTING
CONTROLS
PRIOR
TO
TURN-ON.
Only
those
actions
described
in
2-4
are
necessary
for
oper-
ating
the
PROCEDURES
FOR
DETERMINING
OPERATIONAL
READINESS
AND
ACCEPTABLE
INDICATIONS.
WARNING
DANGEROUS
VOLTAGES
EXIST
IN
THIS
EQUIPMENT
EL6TW002
2-2.
Controls
and
Indicators
Do
not
come
in
contact
with
test
leads
or
terminals
WARNING
Potentials
during
operation.
as
high
as
550
Volts
exist
DANGEROUS
VOLTAGES
EXIST
during
operation.
IN
THIS
EQUIPMENT
DON'T
TAKE
CHANCES!
Do
not
come
in
contact
with
test
leads
or
terminals
during
operation.
Potentials
a.
Disconnect
ohmmeter
from
all
as
high
as
600
Volts
exist
and
turn
crank
at
approxi-
during
operation.
mately
160
rpm.
DON'T
TAKE
CHANCES!
b.
Meter
should
remain
deflected
to
"
",
1/16".
OPERATING
PROCEDURES.
c.
Connect
a
short
circuit
across
To
determine
the
insulation
resis-
the
red
and
black
ohmmeter
terminals
tance
of
a
circuit,
connect
the
circuit
and
turn
crank
at
approximately
160
to
the
terminal
posts
of
the
ohmmeter
rpm.
using
the
test
leads
provided
and
crank
the
handle.
The
ohmmeter
d
.
Meter
should
deflect
to
"0"
pointer
indicates
the
in
1/16".
0-1000
Megohms
on
the
ohmmeter
dial.
The
ohmmeter
has
a
guard
circuit
that
can
be
used
to
reduce
the
effect
of
OPERATOR'S
CHECKS
AND
surface
leakage.
ADJUSTMENTS.
A
third
test
lead
is
Operator's
checks
and
adjustments
provided
for
this
use.
When
surface
are
limited
to
those
actions
described
leakage
on
an
insulator
is
suspect,
in
2-6.
connect
the
guard
lead
to
the
insula-
tor.
Contact
with
the
insulator
can
be
obtained
by
wrapping
metal
foil
or
2-8
OPERATOR'S
MAINTENANCE
ACTIONS
AND
SCHEDULES
a
rag
dampened
with
salt
water
around
Operator's
maintenance
actions
and
the
insulator
at
its
midpoint.
If
use
