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CAUTION
The
Null Detector used
must be
able
to
withstand
voltages
up
to
1200V
between
its
input terminals.
Such
voltages
will
be
present during the time
that
the
4708
is
ramping from
zero
to
lOOOV
Full
Range
after setting
OUTPUT
ON.
Inadvertent
disconnection of
the Precision
Divider
terminals
can
transfer
full
output across
the
Null
detector.
Preparation:
Before
any
calibration
from
the front
panel
is
carried
out,
prepare
the
4708
as follows:
4708
DC VOLTAGE
CALIBRATION
1.
Initial
Set
up.
CAUTION:
First
read
the
Notes
on
the
use of
the
Null Detec-
tor in
Section
7,
page 7-A3-1 (Appendix
3).
Carry out
the
Preparation
as detailed
on Page
8-4.
1
.
Turn on
the
instrument
to
be checked and
allow
minimum
of
2
hours
to
warm-up
in
the specified
environment.
Select
DC
and connect
the
DC
Voltage
Calibration
Source and
Null Detector
to
the
4708
terminals as
shown
in Fig. 8.1(a).
2.
IEEE
488 Address
switch:
Set
to
ADD
mil
as
shown
(Address
31),
Use
short leads,
ensure
that
the Calibration
Source
voltage
is
set
to
zero
and
that
the inter-connecting
circuit
has thermally
stabilized.
3.
CALIBRATION
ENABLE
key
switch:
Insert
Calibration
Key
and
turn
to
ENABLE.
CALIBRATION
ENABLE
RUN
.
These
actions activate the four calibration
modes
(labeled
in
red)
and
present
the
'caT legend
on
the
MODE
display.
4.
Ensure
that
OUTPUT
OFF
LED
is
lit.
Return
to use:
When
any
calibration
is
completed,
re-
turn the
4708
to
use
as follows:
1.
Ensure
that
OUTPUT OFF LED
is
lit.
2.
CALIBRATION
ENABLE
key
switch:
Turn
to
RUN
and withdraw
calibration
key.
3.
IEEE
488
Address
switch:
Restore
to
correct
address
if
the
4708
is
to
be used
in
an
IEEE
488
system.
2.
Calibrate
as
follows:
a)
Full Calibration
Calibrate the
DC
Voltage ranges
in
the step
sequence of Table
8.2,
using
the Calibration
Routine
at
each
step
(except
steps
2 and
3).
For
steps
10
-
13,
reconnect
as Fig.
8.1(b).
b)
Partial
Calibration
Carry out Step
1
of Table
8.2.
Proceed
with
the desired steps
of Table
8.2,
using
the Calibration
Routine
at
each
step
(except
steps
2 and
3).
For
steps
10
-
13,
reconnect
as
Fig.
8.1(b).
(a)
Low
Voltage
1
0OpV
- 1
0V
Ranges
(b)
High Voltage
100V
-
1000V Ranges
Fig. 8.1
4708 connections
for
DC
Voltage
Calibration
8-4
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