HP 3457A Service Manual page 124

Calibration 3457A
4. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running. eS
d, Repeat steps "cl " through " c4 " for each of the remaining voltage ranges.
e. Remove the short from the front panel HI and LO Input Terminals.
5-23. DC Volts Gain Calibration - Front Terminals
5-24. Equipment Required. A DC Voltage Source capable of providing 30 mV (+.0055%), 300 mV
(+.0012%), 3 V (+.0006%), 30 V (+.0013%) and 300 V (+.0017%) is required for the following procedure.
a. Set the HP 3457A to the 300 volt range. (Use the | scroll key to select the 300 V range).
b. Connect the Voltage Source to the HP 3457A front panel HI and LO input terminals and set its
output to 300 V.
c. Use the following steps to calibrate the DC Voltage Gain on the 300 V, 30 V, 3 V, 300 mV and
30 mV ranges beginning with the 300 V range and ending on the 30 mV range.
1, Set the 3457A to the appropriate voltage range. (Use the { or | scroll key to select the proper voltage
range).
2, Set the voltage source to an output which will provide a full-scale reading on the HP 3457A.
3. Access the Calibration Command. (Press the Blue SHIFT key, then the OFFSET COMP / C configura-
tion key), The display will show CAL. r
4, Enter the value of the input voltage (in volts). (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).
5. Press the ENT key. The display will show CALIBRATING while the calibration routine is
running,
d. Repeat steps "cl" through "c5 " for each of the remaining voltage ranges.
e. Set the output of the Voltage Source to 3 volts.
5-25. DC Volts Linearity Calibration - Front Terminals
5-26. Equipment Required. A DC Voltage Source capable of providing 3 V (+.0006%) is required to
calibrate linearity of the DC Voltage Function.
a. Set the HP 3457A to the 3 volt range.
b. Set the Voltage Source for an output voltage of 3 Vdc.
c. Reverse the leads at the 3457A input terminals to provide a negative input voltage.
d. Access the Calibration Command. (Press the Blue SHIFT key then the OFFSET COMP / C configuration
key). The display will will show CAL. #