Hitachi V-211 - Page 14

4.
CALIBRATION
Hitachi
Denshi,
Ltd. provides
complete
instrument
repair and recali-
bration at our office,
and
authorized
dealer. Contact
your local
Hitachi
Denshi
sales
office or
representative.
4.
1
Calibration
interval
To
maintain instrument
accuracy,
perform the
calibration of
the
V-211
,
V-212,
V-222,
V-422
at least
every 1000
hours of
operations or
every
six month
if used
infrequently.
4.
2
Test
equipment
required
The following test equipment
and
accessories, or
its equivalent, are
required for the complete calibration of
the
V-211
,
V-212,
V-222,
V-422.
Specifications given
for
the
test equipment
are
the
minimum
necessary
for
accurate calibration.
Therefore,
the
specifications
of
any
test equipment
used must
meet
or
exceed
the
listed
specifications.
All the test equipment is assumed
to
be
correctly
calibrated and operated
within the
listed
specification.
Operating
instructions for
the test
equip-
ment
are
not
given in
this
procedure.
Refer
to
the
instruction
manual
for the test equipment if
more
information is
needed.
4.
3
Preliminary
procedure
This
instrument
should be
calibrated
at
an
ambient
temperature of +20
c
C
(+5
°C)
for
best overall
accuracy.
1
.
Connect
the instrument
to
AC
line
voltage,
50/60/400
Hz
line
source.
2.
Set
the
instrument
controls as
given
in the preliminary control sett-
ings.
Allow
at least
fifteen
minutes of
warmup before
proceeding.
3.
See
the
adjustment
locations
in the
pullout
pages.
9