HP 3457A - 4-34. 4-Wire Ohms Function - Offset Test

Performance Tests
4-Wire Ohms Performance Tests Cont'd
4-34. 4-Wire Ohms Function - Offset Test
4-35. Equipment Required. A low thermal short (copper wire) is required for this procedure.
3457A
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 4-6.
3. Use the Test Record to record the offset readings of 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
specified in Table 4-9 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V of this manual for calibration
procedures.
5. Remove the short from the front panel input terminals.
34578 3457A |3457A | 90 day Limits | 1 year Limits
Input Range | Set Up
Short 30 ohm OHMF | 00.00335 ohm 00.00335 ohm
Short |300 ohm OHMF | 000.0035 ohm 000.0035 ohm
Short 3 Kohm | OHMF | 0.000007 Kohm | 0.000007 Kohm
Short 30 Kohm | OHMF | 00.00007 Kohm | 00.00007 Kohm
Short |300 Kohm | OHMF | 000.0008 Kohm | 000.0008 Kohm
Short 3 Mohm | OHMF | 0.000014 Mohm | 0.000014 Mohm
Short 30 Mohm | OHMF | 00.00083 Mohm | 00.00083 Mohm
Table 4-9. 4-Wire Ohms Offset Test Limits
4-12
Figure 4-7. 4-Wire Ohms Gain Performance Test Connections