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258 L4400 User’s Guide
A L4451A and L4452A Calibration Procedures
Voltage Adjustments
1 With the DMM disconnected from the L4451A, set the DMM to the
100V range or the lowest range that can measure 16V (do not use
autorange).
2 Short the inputs to the DMM. The DMM reading is the offset voltage
for the selected range. If the DMM has “null” capability, turn it on at
this time. Otherwise, record the offset which will be subtracted from
the subsequent voltage measurements.
3 Unsecure the instrument for calibration using the command:
CALibration:SECure:STATe 0, <code>
4 Connect channel 1 of the L4451A to the DMM as shown in Figure A- 2.
Set the DMM to measure DC volts.
5 Refering to Table A- 3, set the first DAC calibration point using the
command:
CALibration:BEGin:VOLTage 1, (@<channel>)
For channel 1, the command is executed as:
CALibration:BEGin:VOLTage 1, (@1001)
6 Measure the DAC output on the DMM. Subtract the offset voltage
measured in Step 2 from the reading. Write this value to the DAC
using the command:
CALibration:POINt? <value>
Note the DAC output which is now calibration point 2 (Table A- 3).
Subtract the offset voltage from the new DMM reading and write the
value to the DAC as above.
7 Repeat Step 6 until the nine voltage calibration points have been
entered and measured. ”0” is returned after the last calibration point
(point 9) indicating the end of the sequence.
8 Separately connect L4451A channels 2, 3, and 4 to the DMM as shown
in Figure A- 2. Repeat Steps 5 through 7 for each channel until
calibration points 1 through 9 have been measured and entered.