HP 3457A Service Manual page 131

b. Select the rear input terminals. (Press the TERM configuration key, enter the number 2 and press the ENT
@ key).
c. Select the DC Voltage function. (Press the DCV function key ).
d. Use the following procedure to calibrate the rear terminal offset on the 300 V, 30 V, 3 V, 300 mV,
and 30 mV ranges beginning with the 300 V range.
1, Set the 3457A to the appropriate voltage range. (Use the t or J scroll key to select the proper voltage
range).
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 "di " through " d4 "for each of the remaining voltage ranges.
5-49. Two-Wire Ohms Offset Calibration - Rear Terminals (Standard Instrument)
5-50. Equipment Required. A low thermal short is required for this procedure.
a. Short the Q 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 2-Wire Ohms function. (Press the OH M function key ).
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 " d1 " through " d4 " for each of the remaining ranges.