HP 3457A - 4-47. 4-Wire Ohms Function - Offset Test

Performance Tests
Rear Input Performance Tests (Standard Instrument) Cont’d
3457A
2. 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.
3. If any of the offset readings are beyond the limits specified in Table 4-13 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
34578 3457A | 3457A | 90 day limits | 1 year Limits
Input Range | Set Up
Short 30 ohm OHM 00.20335 ohm 00.20335 ohm
Short |300 ohm OHM 000.2035 ohm 000.2035 ohm
Short 3 Kohm | OKM 0.000207 Kohm | 0.000207 Kohm
Short 30 Kohm | OHM 00.00027 Kohm | 00.00027 Kohm
Short |300 Kohm | OHM 000.0010 Kohm | 000.0010 kKohm
Short 3 Mohm | OHM 0.000014 Mohm | 0.000014 Mohm
Short 30 Mohm | OHM 00.00083 Mohm | 00.00083 Mohm
Table 4-13. 2-Wire Ohms Offset Test Limits (Rear Terminals)
4-47. 4-Wire Ohms Function - Offset Test
4-48, Equipment Required. A low thermal short (copper wire) is required for this procedure.
4-16
1, Set the HP 3457A to the 4-Wire Ohms Function (OHMF) and the number of digits displayed
(DIGITS DISP) to six.
2. 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.
3. If any of the offset readings are beyond the limits specified in Table 4-14 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
3457A 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 kKohm
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 4-14. 4-Wire Ohms Offset Test Limits (Rear Terminals)