HP 3457A - 4-Wire Ohms Operational Verification Tests; 4-84. 4-Wire Ohms Function - Offset Test

Operational Verification Tests
2-Wire Ohms Operational Verification Tests Cont'd
34578 3457A
|
3457A
90
day
Limits
1
year
Limits
Input
Range
| Set Up
High
|
Low
High
Low
3
Kohm|
3
Kohm|
OHM
3.000312
Kohm
2.999688
Kohm
3.000357
Kohm
2.999643
Kohm
30
Kohm]
30
Kohm|
OHM
30.00132
Kohm
29.99868
Kohm
30.00177
Kohm
29.99823
Kohm
300
Kohm}
300
Kohm|
OHM
300.0130
Kohm
299.9870
Kohm
300.0160
Kohm
299.9840
Kohm
Table 4-26. 2-Wire Ohms Gain Test Limits
4-Wire Ohms Operational Verification Tests
_— - ——s
SENSE INPUT
lawn tne,
—_— natu ~ —
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MEAN A SOEV RLNSAMP | ERROR.
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Figure 4-17. 4-Wire Ohms Operational Verification Test Connections
4-84. 4-Wire Ohms Function - Offset Test
4-85. Equipment Required. A low thermal short (copper wire) is required for this procedure.
1.
Set
the
HP
3457A
to
the
4-Wire
Ohms
Function
(OHMF)
and
the
number
of
digits
displayed
(DIGITS
DISP)
to
six.
2. Short the front panel input terminals of the HP 3457A as shown in Figure 4-17.
3.
Use
the
Test
Record
to
record
the
offset
readings
of
the
3
Kohm,
30
Kohm
and
300
Kohm
ranges.
4.
If
any
of
the
offset
readings
are
beyond
the
limits
specified
in
Table
4-27
and
on
the Test
Record,
the
instrument
should
be
calibrated.
Refer
to
Section
V
of
this
manual
for
calibration
procedures.
5. Remove the short from the front panel input terminals.
4.29