HP 3457A Service Manual page 65

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Performance Tests
2-Wire Ohms Performance Tests
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Figure 4-5. 2-Wire Ohms Performance Test Connections
4-30. 2-Wire Ohms Function - Offset Test
4-31. Equipment Required. A low thermal short (copper wire) is required for this procedure.
1. Connect a low thermal short across the HP 3457A front panel HI and LO input terminals.
3457A
2. Set the HP 3457A to the 2-Wire Ohms Function, 30 Ohm range and the number of digits displayed
(DIGITS DISP) to six.
3. Use the Test Record to record the offset readings for the 30 Ohm, 300 Ohm, 3 Kohm, 30 Kohm,
300 Kohm, 3 Mohm and 30 Mohm ranges.
4. If any of the offset readings are beyond the limits specified in Table 4-7 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
5. Remove the short from the front panel input terminals.
34578 34578 | 34578
Input Range | Set Up
90 day Limits 1 year Limits
Short 30 ohm OHM
Short 300 ohm OHM
Short 3 Kohm | OHM
Short 30 Kohm | OHM
Short 300 Kohm OHM
Short 3 Mohm OHM
Short 30 Mohm | OHM
00.20335 ohm
000.2035 ohm
0.000207 Kohm
00.00027 Kohm
000.0010 Kohm
0.000014 Mohm
00.00083 Mohm
00.20335 ohm
000.2035 ohm
0.000207 Kohm
00.00027 Kohm
000.0010 Kohm
0.000014 Mohm
00.00083 Mohm
Table 4-7. 2-Wire Ohms Offset Test Limits
4-10