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260 L4400 User’s Guide
A L4451A and L4452A Calibration Procedures
CALibration:BEGin:CURRent 1, (@1001)
6 Measure the DAC output on the DMM. Subtract the current offset
measured in Step 2 from the reading. Write this value to the DAC
using the command:
CALibration:POINt? <value> (measured current in Amps)
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 13 curent calibration points have been entered
and measured. ”0” is returned after the last calibration point (point
13) indicating the end of the sequence.
8 Separately connect L4451A channels 2, 3, and 4 to the DMM as shown
in Figure A- 1. Repeat Steps 5 through 7 for each channel until
calibration points 1 through 13 have been measured and entered.
Table A-4. L4451A DAC Current Calibration Points.
Calibration Point
Minimum
Expected Value
Maximum
Expected Value
Result
1
-2.0 mA 2.0 mA
2
-10.0 mA -8.0 mA
3
-10.9 mA -8.0 mA
4
-11.5 mA -9.5 mA
5
8.0 mA 10.9 mA
6
9.0 mA 11.0 mA
7
9.5 mA 11.5 mA
8
-22.0 mA -16.0 mA
9
-22.0 mA -16.0 mA
10
-22.0 mA -16.0 mA
11
16.0 mA 22.0 mA
12
16.0 mA 22.0 mA
13*
16.0 mA 22.0 mA
* Current calibration constants for the channel are saved in non-volatile
memory after completion of this step.