Calibration Procedure - HP 6811B User Manual

Calibration Procedure

Table B-1 lists the equipment required for calibration. Figure B-1 shows the test setup. The following
procedures assume you understand how to operate front panel keys (see chapter 4).
WARNING LETHAL VOLTAGES. Ac sources can supply 425 V peak at their output. DEATH
on contact may result if the output terminals or circuits connected to the output are
touched when power is applied. These procedures must be performed by a qualified
electronics technician or engineer trained on this equipment.
Summary of Front Panel Calibration Menu
The Entry keypad is used for calibration functions.
Shift Cal
Press this key to access the calibration menu.
Display
CAL ON <value>
CAL OFF
CAL:LEV <char>
CAL:DATA <value>
SHUNT <value>
CAL:VOLT:OFFSET
CAL:VOLT:DC
CAL:VOLT:AC
CAL:VOLT:PROT
CAL:VOLT:EXT
CAL:CURR:AC
CAL:CURR:MEAS
CAL:CURR:EXT
CAL:IMP
CAL:SAVE
CAL:PASS <value>
Enable Calibration Mode
Action
1. Reset the unit by selecting Shift, Output, and pressing Enter.
2. Press Shift Calibration, enter the calibration password from Entry keypad,
and press Enter. If the password is correct, the Cal annunciator will come on.
(If no password has been set, just press Enter.)
If the password is incorrect, an error occurs. If the active password is lost, the
calibration function can be recovered by setting an internal switch that defeats
password protection (see the Service Manual.)
If CAL DENIED appears, then an internal switch has been set to prevent the
calibration from being changed (see the Service Manual.)
Command Function
Turns calibration mode on when the correct password
value is entered.
Turns calibration mode off
Advance to next step in sequence (P1, P2, P3, or P4).
Input a calibration measurement.
Enter a value for the external current shunt in ohms.
Begin voltage offset calibration
Begin dc voltage calibration sequence
Begin ac voltage calibration sequence
Begin voltage protection calibration
Begin external voltage calibration sequence
Begin ac current calibration sequence
Begin current measurement calibration sequence
Begin external current calibration sequence
Begin output impedance calibration sequence
Saves the calibration constants in non-volatile memory.
Set new calibration password.
Display
*RST
CAL ON 0.0
OUT OF RANGE
CAL DENIED
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