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L4451A and L4452A Calibration Procedures A
L4400 User’s Guide 259
Table A-3. L4451A DAC Voltage Calibration Points.
Current Adjustments
1 With the DMM disconnected from the L4451A, set the DMM to the
100mA range or the lowest range that can measure 20 mA (do not use
autorange).
2 The DMM reading is the current offset 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 current
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- 1.
Set the DMM to measure DC current.
5 Refering to Table A- 4, set the first DAC calibration point on channel 1
using the command:
CALibration:BEGin:CURRent 1, (@<channel>)
For channel 1, the command is executed as:
Calibration Point
Minimum
Expected Value
Maximum
Expected Value
Result
1
-0.5V 0.5V
2
-10.0V -8.0V
3
-10.5V -8.5V
4
-11.0V -9.0V
5
-11.5V -9.5V
6
8.0V 10.0V
7
8.5 V 10.5V
8
9.0V 11.0V
9*
9.5V 11.5V
* Voltage calibration constants for the channel are saved in non-volatile
memory after completion of this step.