HP 3457A Service Manual page 73

Rear Input Performance Tests (44491A Relay Assy.) Cont'd
3457A |3457A | 34578 Test Limits
Input |Range | Set Up High Low
Short |300 v | ocv +000.0007 v -000.0007 v
Short | 30 v | ocv + 00.00020 v - 00.00020 v
Short 3 v | ocv + 0.000010 v 0.000010 v
Short |300 mv| cv +000.0070 mv -000.0070 mv
Short | 30 mv] ocv + 00.00685 mv 00.00685 mv
Table 4-15. DC Voltage Offset Test Limits (44491A)
4-52. 2-Wire Ohms Function - 44491A Offset Test Limits
4-53. Equipment Required. Low thermal (copper) shorting wires are required for this procedure.
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, 300 Ohm and 30 Ohm ranges.
5. If any of the offset readings are beyond the limits specified in Table 4-16 and on the Test Record,
the instrument should be calibrated or repaired. Refer to Section V for calibration procedures.
34570 3457A 34578 Test Limits
Input Range |Set Up
Short 30 ohm OHM 02.20635 ohm
Short 300 ohm OHM 002.2065 ohm
Short 3 Kohm OHM 0.002210 Kohm
Short 30 Kohm OHM 00.00230 Kohm
Short |300 Kohm | OHM 000.0033 Kohm
Short 3 Mohm OHM 0.000019 Mohm
Short 30 Mohm OHM 00.00086 Mohm
Table 4-16. 2-Wire Ohms Offset Test Limits (44491A)
4-54. 4-Wire Ohms Function - 44491A Offset Test Limits
4-55. Equipment Required. Low thermal (copper) shorting wires are required for this procedure.
1. Set the HP 3457A to the 4-Wire Ohms Function (OHMF). Set the offset compensation (OFFSET
COMP) on, and the number of digits displayed (DIGITS DISP) to six.
@