HP 3457A Service Manual page 132

Calibration 3457A
5-51. Four-Wire Ohms Offset Calibration - Rear Terminals (Standard Instrument)
5-52. Equipment Required. A low thermal short (copper wire) is required for this procedure.
a, Short the > SENSE HI and LO and INPUT HI and LO rear input terminals together,
b. Select the rear input terminals. (Press the TERM configuration key, enter the number 2 and press the ENT
key ).
c. Select the 4-Wire Ohms function. (Press the Blue SHIFT key, then the OHM / OH MF function key ).
d. Use the following procedure to calibrate the rear terminal 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 { or | scroll key 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.
e. Repeat steps "dl" through " d4 " for each of the remaining ranges.
5-53. DC Current Offset Calibration - Rear Terminals (Standard Instrument)
5-54. Equipment Required. No equipment is needed for this procedure.
5-14
a. Select the rear input terminals, (Press the TERM configuration key, enter the number 2 and press the ENT
key).
b. Select the DC Current function. (Press the DCI function key ).
c. Use the following procedure to calibrate the rear terminal offset on the 300 uA, 3 mA, 30 mA,
300 mA, and 3 A ranges beginning with the 3 A range.
1, Set the 3457A to the appropriate current range. (Use the } or | scroll key 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.