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L4451A and L4452A Calibration Procedures A
L4400 User’s Guide 255
Figure A-2. L4451A Output Voltage Connections.
Analog Output Verification Test
This procedure is used to check the calibration of the current and
voltage outputs on the L4451A 4- channel DAC. Verification checks are
performed only for those output values with unique calibration constants.
Current Output Verification
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 Connect channel 1 of the L4451A as shown in Figure A- 1. Configure
the L4451A to output the currents listed in Table A- 2. For each
current level measured, subtract the current offset recorded in Step 2
as applicable. The results should be within the limits listed in Table
A- 2.
4 Repeat Step 3 for L4451A channels 2, 3, and 4.
HI
I
HI
DMM
L4451A Terminal Block
Output Voltage verification
LO
LO
twist wires