HP 3457A Service Manual page 84

Operational Verification Tests
2-Wire Ohms Operational Verification Tests Cont'd
- -
Table 4-26. 2-Wire Ohms Gain Test Limits
4-Wire Ohms Operational Verification Tests
R UEAN R SDEV R NSAUP
/
B ~ e ~ ~
3457A
I
n p u
t
3 Kohm
30 Kohm
300 Kohm
1
y e a r
L i m i t s
LAST
H i g h
3.000357 Kohm
30.00177 Kohm
300.0160 Kohm
90 d a y
l i m i t s
Figure 4-1 7. 4-Wire Ohms Operational Verification Test Connections
3457A
Range
3 Kohm
30 Kohm
300 Koh~n
Low
2.999643 Kohm
29.99823 Kohm
299.9840 Kohm
H i g h
3.000312 Kohm
30.00132 Kohm
300.0130 Kohm
4-84. 4-Wire Ohms Function
-
Offset Test
4-85. Equipment Required. A low thermal short (copper wire) is required f o r this procedure.
3457A
S e t Up
OHM
OHM
OHM
Low
2.999688 Kohm
29.99868 Kohm
299.9870 Kohm
1. Set the HP 3457A t o the 4-Wire Ohms Function (OHMF) and the number of digits displayed
(DIGITS DISP) t o six.
2. Short the front panel input terminals of the HP 3457A as shown in Figure 4-17.
3. Use the Test Record t o record the offset readings of the 3 I<oh~.n, 30 Kohm and 300 I<ohm ranges.
4. If any of the offset readings are beyond the limits specified in Table 4-27 and o n the Test Record,
the instrument should be calibrated. Refer t o Section V of this manual f o r calibration procedures.
5. Remove the short f r o m the front panel input terminals.