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B - Verification and Calibration
72
Front Panel Calibration
WARNING: LETHAL VOLTAGES. Ac sources can supply 424 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.
The following procedures assume you understand how to operate front panel keys (see Chapter 4).
Enable Calibration Mode
Action Display
1.
Reset the unit by selecting Output, scrolling to the *RST command and
pressing Enter.
*RST
2.
To begin calibration press Shift Cal, scroll to CAL ON and press Enter.
CAL ON 0.0
3.
Enter the calibration password from Entry keypad and press Enter. lf the
password is correct the Cal annunciator will come on.
If CAL DENIED appears, then an internal switch has been set to prevent the
calibration from being changed. (see the Service Manual.)
lf 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.)
CAL DENIED
OUT OF RANGE
Calibrating and Entering Voltage Offset Values
Connect the negative terminal of the DVM to the COM output terminal. Note that some calibration
points are negative; be sure to enter the CAL:DATA as negative values when required.
Action Display
4. Connect the DVM (dc volts mode) directly to the ac source. Do not connect
the ratio transformer or load resistor shown in Figure B-1.
5.
Press Shift Calibration, scroll to the CAL VOLT OFFSET command, and
press Enter.
CAL:VOLT:OFFSET
6.
Press Shift Calibration, scroll to the CAL LEV P1 command, and press
Enter to select the first calibration point.
CAL:LEV P1
7.
Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry
keypad to enter the dc voltage value displayed on the DVM.
CAL:DATA 0.00
8.
Press Shift Calibration, scroll to the CAL LEV P1 command, use ° to
scroll to the P2 parameter, and press Enter. This selects the second
calibration point.
CAL:LEV P2
9.
Press Shift Calibration, scroll to CAL DATA 0.00, and use the Entry
keypad to enter the dc voltage value displayed on the DVM.
CAL:DATA 0.00
10.
Press Shift Calibration, scroll to the CAL LEV P1 command, use ° to
scroll to the P3 parameter, and press Enter.
CAL:LEV P3