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Model
1920
Maintenance
WARNING
Performance
verification
should
be performed
by qualified
personnel
using
accurate
and reliable
test
equipment.
3-11.
INITIAL
CONDITIONS
3-12.
Before
beginning
the
verification
procedure,
the
instrument
must
meet the
following
conditions:
A.
If
the
instrument
has
been
subject
to
extremes
of
temperature,
allow
sufficient
time
for
internal
temperatures
to
reach
environmental
conditions
specified
(1X0-28'C).
Typically,
it
takes
one hour
to
stabilize
a unit
that
is
10°C
(1U'F)
out
of
the
specified
temperature
range.
B.
Turn
on the
instrument
and allow
it
to
warm up for
two
hours
before
using
it
with
the
Model
192 and one hour
before
using
it
with
the
Model
1Yl.
WARNING
Some procedures
require
the
use
of
high
voltage.
Take care
to
prevent
contact
with
live
circuits
which
could
cause
electrical
shock
resulting
in
injury
or death.
3-5
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