HP 3457A Service Manual page 135

3457A Calibration
e. Repeat steps "dil" through " d4" for each of the remaining ranges.
& 5-59. Two-Wire Ohms Offset Calibration - HP 44491A
a, Select the 2-Wire Ohms function. (Press the OHM function key ).
b. Close channel 0. (Press the CHAN configuration key, enter the number 0 and press the ENT key ).
c. Use the following procedure to calibrate the 2-wire ohm offset on the 30 Mohm, 3 Mohm,
300 Kohm, 30 Kohm, 3 Kohm, 300 Ohm and 30 Ohm ranges beginning with the 30 Mohm range.
I, Set the 3457A to the appropriate resistance range. (Use the { or | scroll keys to select the proper
range),
2. Access the Calibration Command. (Press the Blue SHIFT key, then the OFFSET COMP / C configura-
tion key). The display will show CAL,
3. Enter the value of the input - in this case 0. (NOTE: If the security feature has not been disabled (set to
0), it will be necessary to enter the input value, the delimiter ( , ) and the security code).
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running.
d, Repeat steps "cl " through "c4 " for each of the remaining ranges.
5-60. Four-Wire Ohms Offset Calibration - HP 44491A
e a. Select the 4-Wire Ohms function. (Press the Blue SHIFT key then the OHM / OH MF function key ).
b. Close channel 10. (Press the CHAN configuration key, enter the number 10 and press the ENT key ).
c. Use the following procedure to calibrate the 4-Wire ohm offset on the 30 Mohm, 3 Mohm,
300 Kohm, 30 Kohm, 3 Kohm, 300 Ohm and 30 Ohm ranges beginning with the 30 Mohm range.
1. Set the 3457A to the appropriate resistance range. (Use the t or J scroll keys to select the proper
range).
2. Access the Calibration Command. (Press the Blue SHIFT key, then the OFFSET COMP / C configura-
tion key). The display will show CAL.
3. Enter the value of the input - in this case 0, (NOTE: If the security feature has not been disabled (set to
0), it will be necessary to enter the input value, the delimiter ( , ) and the security code).
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running.
d. Repeat steps "cl " through "c4 "for each of the remaining ranges.
5-61. DC Current Offset Calibration - HP 44491A
a. Select the DC Current function. (Press the DCI function key.)