Datron 4708 User Handbook Manual page 88

AC
Voltage
Verification
(IV
-
lOOOV
Full
Range
Values;
lOV Range
Linearity).
Summary
of Verification
Procedures
Full
Range
Voltage
(1V
-
1000V Ranges)
The 4708
is
connected
up and
set to
output a Full
Range
voltage
at
the required frequency.
The
Thermal
Transfer
is
nulled against the
4708
Full
Range
voltage.
The
DC
Standard
is
adjusted
to null
with the
Thermal
Transfer,
and
its
output
voltage recorded.
Its
uncertainty
is
also recorded,
and
the
Tolerance Limits
calculated.
The
4708
is
verified if
the
DC
voltage
is
within the tolerance
limits.
Details
of
the
procedure
are
on
pages
7-14/15.
2. Linearity
(Performed on 10V Range)
Should be checked
at
IV,
lOV
and
19V
in turn.
Similar
techniques are used
as for Full
Range
voltages.
For each
check
the results are recorded.
See pages 7-14/15
for the procedure.
interconnections
Interconnection
instructions in
this
section are necessarily
simple
and
basic,
and
are
mainly intended
to
show
connec-
tions to the
4708.
It is
recognized
that
they
may
need
to
be
adapted
to
meet
an
individual
user's
requirements.
It is
assumed
that users
will
possess
knowledge
of the operation
and
use of standards
equipment such
as that
mentioned
above.
Equipment Requirements
•
An
adjustable
DC
Voltage Source of
suitable
accuracy.
Example:
Datron
4000
or
4000A
Autocal Standard.
An AC/DC
Thermal Transfer Standard capable of
operating
over
the
range
IV
to
1
lOOV
RMS.
Preparation
Before
attempting
any
verification ensure that the follow-
ing
steps
have been
carried
out.
1.
Turn on
the
instrument
to
be checked and allow
at least
2 hours
warm-up
in the specified
environment.
2.
Cancel any
MODE
keys, ensure
OUTPUT
is
OFF
and
check
that
'cal'
is
not present
on
the
MODE
display.
(If
'cal' is
present, turn the Calibration
Keyswitch on
the
Rear
Panel
to
its
RUN
position).
3
.
Before connecting and operating
any
equipment,
consult the manufacturers'
handbooks.
4
.
Self-Test:
Press the Test'
key
to carry
out
the
test
routine described
in
Section
4.
Terminate
the
test routine.
5. If 'Spec'
Mode
is
required, select either 24hr,
90dy
or
lyr
on
the
4708 Rear
Panel
CALIBRATION
INTERVAL
Switch.
When
received from Datron,
90dy
is
the relevant selection.
The
report sheets hold
figures for
this interval.
7-12