HP 3457A - 5-27. Two-Wire Ohms Offset Calibration - Front Terminals; 5-29. Two-Wire Ohms Gain Calibration - Front Terminals

3457A
Calibration
e.
Enter
the
value
of
the
input
voltage
(in
volts),
including
the
polarity.
(NOTE:
If
the
security
feature
has
]
not
been
disabled,
(set
to
0)
it
will
be
necessary
to
enter
the
input
value,
the
delimiter
(
,
)
and
the
security
code).
f. Press
the
ENT
key.
The
display
will
show
CALIBRATING
while
the
calibration
routine
is
running.
g. Set the output of the Voltage Source to 0 V and disconnect it from the HP 3457A input terminals.
5-27. Two-Wire Ohms Offset Calibration - Front Terminals
5-28. Equipment Required. A low thermal short (copper wire) is required for this procedure.
a. Select the 2-Wire Ohms Function. (Press the OH M function key ).
b. Connect a short between the Front Panel HI and LO input terminals.
c.
Use
the
following
procedure
to
calibrate
the
front
terminal
offset
on
the
30
ohm,
300
ohm,
3
Kohm,
30 Kohm,
300
Kohm,
3
Mohm
and
30 Mohm ranges
beginning
with the
30
Mohm
range.
1,
Set
the
3457A
to
the
appropriate
resistance
range.
(Use
the
t
or
1
scroll
key
to
select
the
proper
range).
2.
Access
the
Calibration
Command.
(Press
the
Blue
SHIFT
key,
then
the
OFFSET
COMP
/
C
configura-
tion
key
). The
display
will
show
CAL.
3.
Enter
the
value
of
the
input
resistance
-
in
this
case
0.
(NOTE:
If
the
security
feature
has
not
been
disabled,
(set
to 0)
it
will
be
necessary
to
enter
the input value,
the delimiter
(
,
)
and the
security
code).
r
)
4.
Press
the
ENT
key.
The
display
will
show
CALIBRATING
while
the
calibration
routine
is
running.
d. Repeat steps "cl " through " c4 " for each of the remaining ranges.
e. Remove the short from the Front Panel HI and LO Input Terminals.
5-29. Two-Wire Ohms Gain Calibration - Front Terminals
5-30.
Equipment
Required.
Resistance
Standards
of
30
Ohms
(+.2%),
300
Ohms
(+.02%),
3
Kohms
(+.003%),
30
Kohms
(+.001%),
300
Kohms
(4.001%),
3
Mohms
(4.002%)
and
30
Mohms
(+.009%)
are
required
to
calibrate the 2-Wire Ohms Function.
a.
Run
the
Ohms
Auto-Calibration
routine.
(Press
the
AUTO
CAL
configuration
key,
enter
the
number
3
and
press
the
ENT
key).
b.
Set
the
Resistance
Standard
to
30
MOhms
and
connect
it
to
the
HP
3457A
front
panel
HI
and
LO
input
terminals.
c.
Use
the
following
procedure
to
calibrate
the
Gain
on
the
30
Mohm,
3
Mohm,
300
Kohm,
30
Kohm,
3
Kohm,
300
Ohm
and
30
Ohm
ranges
beginning
with
the
30
Mohm
range.
1.
Set
the
3457A
to
the
appropriate
Resistance
range.
(Use
the
{
or
|
scroll
key
to
select
the
proper
range).
2. Set the resistance standard to the full-scale resistance of HP 3457A range selected.
5-7