HP 3457A - 4-61. 2-Wire Ohms Function - 44492 A Offset Test Limits

Performance Tests 3457A
Rear Input Performance Tests (44492A Multiplex Assy.) Cont’d
3457A | 3457A | 34578 Test Limits
Input |Range | Set Up High Low
short |300 v | pcv +000.0007 v -000.0007 Vv
Short | 30 v | ocv + 00.00020 v - 00.00020 v
Short 3v | ocv + 0.000010 v - 0.000010 v
Short |300 mv] pcv +000.0070 mv -000.0070 mv
Table 4-19. DC Voltage Offset Test Limits (44492A)
4-61. 2-Wire Ohms Function - 44492A Offset Test Limits
4-62. Equipment Required. A low thermal (copper) shorting wire is required for this procedure.
1, Set the HP 3457A to the 2-Wire Ohms Function, 30 Mohm range, set the offset compensation
(OFFSET COMP) on, and the number of digits displayed (DIGITS DISP) to six.
2. Close channel 0. (Press the CHAN configuration key, enter the number 0 and press the ENT key).
3. Use the Test Record to record the offset readings for the 30 Mohm, 3 Mohm, 300 Kohm, 30 Kohm,
3 Kohm and 300 Ohm ranges.
® 4. Test the ohms offset on channels 0 through 9 with the instrument set to the 300 Ohm range.
Record the reading of each channel on the Test Record provided at the end of this section.
5. If any of the offset readings are beyond the limits specified in Table 4-20 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V of this manual for calibration
procedures.
3457A 3457A 3457A Test limits
Input Range | Set Up
Short 300 ohm OHM 004.2065 ohm
Short 3 Kohm | OHM 0.004210 Kohm
Short 30 Kohm | OHM 00.00430 Kohm
Short 300 Kohm OHM 000.0053 Kohm
Short 3 Mohm OHM 0.000021 Mohm
Short 30 Mohm | OHM 00.00086 Mohm
Table 4-20. 2-Wire Ohms Offset Test Limits (44492A)