4-Wire Ohms Function - Gain Test - HP 3457A Service Manual
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3457A
4-36. 4-Wire Ohms Function - Gain Test
4-Wire Ohms Performance Tests Cont'd
Performance Tests
4-37.
Equipment
Required.
Resistance
Standards
of
30 Ohms
(+ .004%),
300 Ohms
( .002%),
3 Kohms
(+ 001%)
30 Kohms
(+ .001%), 300 Kohms
(+ .001%),
3 Mohms
(+ .001%) and
30 Mohms
(+ .009%)
are
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. Connect the appropriate Resistance Standard to the HP 3457A front panel input terminals as shown
in Figure 4-7.
3. Use the Test Record to record the resistance readings for the 30 Ohm, 300 Ohm, 3 Kohm, 30 Kohm,
300 Kohm, 3 Mohm and 30 Mohm
ranges.
4. If any of the readings are beyond the limits specified in Table 4-10 and on the Test Record, the in-
strument should be calibrated or repaired. Refer to Section V for calibration procedures.
5. Remove the Resistance Standard from the HP 3457A front panel input terminals.
3457A
34570
34578
90
day
limits
1 year
limits
Input
Range
Set Up
High
Low
High
Low
30
ohm
30
ohm
OHMF
30.00530
ohm
29.99470
ohm
30.00560
ohm
29.99440
ohm
300
ohm
300
ohm
OHMF
300.0170
ohm
299.9830
ohm
300.0200
ohm
299.9800
ohm
3 Kohm
3 Kohm|
OHMF
3.000112
Kohm
2.999888
Kohm
3.000157
Kohm
2.999843
Kohm
30
Kohm
30
Kohm|
OHMF
30.00112
Kohm
29.99888
Kohm
30.00157
Kohm
29.99844
Kohm
300
Kohm|
300
Kohm|
OHMF
300.0128
Kohm
299.9872
Kohm
300.0158
Kohm
299.9842
Kohm
3 Mohm
3 Mohm|
OHMF
3.000179
Mohm
2.999821
Mohm
3.000209
Mohm
2.999791
Mohm
30 Mohm
30
Mohm|
OHMF
30.00833
Mohm
29.99167
Mohm
30.01283
Mohm
29.98717
Mohm
Table 4-10. 4-Wire Ohms Gain Test Limits
Frequency Counter Performance Tests
f
:
©
FREQUENCY
YP
| | |
SOURCE
|
©
=
S
:
—
Figure 4-8. Frequency Counter Performance Test Connections
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