Datron 4708 User Handbook Manual page 118

Alternative
AC
Millivolts Verification
Appendix 4
to:
4708
User's
Handbook
LF
(1kHz)
and
HF
(100kHz)
Section 7
(ImV
-
lOOmV
Full
Range
Values).
Summary
of Verification
Procedures
At
both
LF
and HF,
the
IV
Full
Range
value
is first
verified
using thermal
transfer, then
this
voltage
is
divided
via
a
wideband
I
VD
to
standardize an
AC
DMM
at the millivolt
Full
Range
value.
The
4708
millivolt
range
is
then verified
at this
standardized value
by
DMM
measurement.
Equipment Requirements
•
A
Wideband
Inductive
Voltage Divider tapped
at 10:
1
,
100:1
and
1000:1 of
suitable
accuracy
and frequency
response.
•
The
DC
Voltage Source used
for
IV
-
lOOOV
ranges
•
The
AC/DC
Thermal
Transfer
used
for
IV
-
lOOOV
ranges.
•
A
DMM
of
suitable
accuracy
and frequency
response.
Example:
Datron 1281
or 1081.
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.
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
Rear Panel
CALIBRATION INTERVAL
Switch.
When
received
from Datron,
90dy
is
the
relevant selection.
The
report sheets hold
figures for
this interval.
7-A4-1