Datron 4708 User Handbook Manual page 140

4708
AC
Voltage
Calibration
(1V
-
1000V)
(Using
Thermal
Transfer Standard and
DC
Calibration Standard)
DC
Voltage
Calibration
Standard
Thermal
DC
Transfer
AC
Standard
4708
to
be
Calibrated
Calibrate the
4708
at
or close to the calibration points
in the
table,
selecting
SET
as required
as part
of
the
following proce-
dure:
WARNING;
THETERMINALS MARKED WITH THE '•^SYMBOL
CARRY THE OUTPUT
OF THE
4708.
THESE TERMI-
NALS
AND ANY OTHER
CONNECTIONS
TO THE
LOAD UNDER
TEST
COULD CARRY LETHAL
VOLT-
AGES.
UNDER NO CIRCUMSTANCES SHOULD
USERS
TOUCH ANY
OF THE FRONT
(OR
REAR)
PANEL TERMINALS
UNLESS
THEY ARE
FIRST SAT-
ISFIED
THAT NO DANGEROUS VOLTAGE
IS
PRES-
ENT.
1.
4708
&
DC
Voltage Standard
With
OUTPUT
OFF,
connect
to
the
Thermal
Transfer
AC
and
DC
inputs, respectively.
2.
Thermal
Transfer Standard
Configure
for
DC
measurement
at
the required Calibra-
tion
Voltage.
3.
DC
Voltage
Calibration
Standard.
Set
to
the
Cal
Voltage,
OUTPUT
ON.
4.
Thermal
Transfer Standard
a.
Adjust
for
Null
at the Cal.
Voltage
b.
Configure
for
AC
measurement
at
the Calibration
Voltage
5.
4708
a.
On
AC
FUNCTION,
select the
required
OUTPUT
RANGE.
b.
Select
the
required
FREQUENCY
RANGE.
c.
Use
FREQUENCY
4 1 keys
to
display the required
Cal.
Frequency
d.
Use
OUTPUT
f t
keys
to
display the required Cal.
Voltage
(if at
Nominal
Full
Range, merely
press the
Full
Range
key).
€.
Set
4708
OUTPUT
ON
(and
if
NOT
at
Nominal
Full
Range,
Select
SET.)
f.
Use
the
OUTPUT
t keys
to adjust the
OUTPUT
Display reading
to
obtain a
null
on
the
Thermal
Trans-
fer.
g.
Execute the calibration
by
pressing
the
CAL
key.
Nominal
Cal. Points for
IV
to
lOOOV
Ranges.
DC
Standard
OUTPUT
Voltage
4708
OUTPUT
RANGE/
FREQUENCY
4708
Nominal
OUTPUT
Voltage
Freq.
Band
set
by
4708
1.
000000
V
IV
IkHz
l.OOOOOOV
LF
1.
000000
V
IV
I
MHz
l.OOOOOOV 'HF
1
0.00000
V
lOV IkHz
lO.OOOOOV
LF
lO.OOOOOV
lOV
IMHz
lO.OOOOOV *HF
lOO.OOOOV
lOOV IkHz
lOO.OOOOV
LF
lOO.OOOOV lOOV lOOkHz
lOO.OOOOV
HF
1
000.000
V
lOOOV IkHz
lOOO.OOOV
LF
1
000.000
V
lOOOV 30kHz
lOOO.OOOV
HFl
700V
at
100k Hz:
'SET'
Calibration
must
be employed
700.000V lOOOV lOOkHz
700.000V
HF2
6.
2-wire
HF
Calibration
(IV and lOV
ranges
- see table
above)
NOTE:
It is
important
that
4-wire
and
2-wire
calibrations are
carried
out
in
the correct sequence.
Two
stores are
used,
one
for
4-wire (which
sets
the
master
HF
cal),
and
the other containing
the corrections to the
4-wire
figures
for
2-wire.
The
correct
procedure
is:
(a)
Select
IV
or
lOV
range.
(b)
Select
Remote
Sense
(c)
Do
a 4-wire
HF
calibration as
normal. This changes
the
numbers
in the
4-wire
calstore
and
clears
the 2-wire
calstore to zero.
(d)
Deselect
Remote
Sense
(e)
Do
the
2-wire
HF
calibration.
This
sets
the correction
numbers
into the
2-wire
calstore. If
steps
b and
c are
omitted, only the 2-wire
calibration
is
performed.
8-13