NI PXI-4070 Calibration Procedure
14
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23. Wait two minutes for the thermal EMF to stabilize.
24. Output 0 V on the calibrator.
25. Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_DC_VOLTS
•
Range
=
0.1
•
Resolution
=
100e–9
26. Set the input resistance of the NI 4070 to >10 G
Ω
by calling
niDMM_SetAttributeViReal64
with the following parameters:
•
Attribute_ID
=
NIDMM_ATTR_INPUT_RESISTANCE
•
Attribute_Value
=
NIDMM_VAL_GREATER_THAN_10_GIGAOHM
27. Call
niDMM_ConfigureMultiPoint
with the following parameters:
•
Trigger Count
=
1
•
Sample Count
=
10
•
Sample Trigger
=
NIDMM_VAL_IMMEDIATE
•
Sample Interval
=
–1
28. Call
niDMM_ReadMultiPoint
with the following parameters:
•
Maximum Time
=
NIDMM_VAL_TIME_LIMIT_AUTO
•
Array Size
=
10
Average the results by summing the returned reading array of the
function and dividing by the returned actual number of points. Store
the result as the 100 mV >10 G
Ω
mode offset.
Table 1.
Spade Lug to Calibrator Binding Post Assignments
Calibration Cable Assembly
Spade Lugs
Calibrator Binding Posts
SHD
V GUARD
HI
OUTPUT HI
LO
OUTPUT LO
2wr COMP+
OUTPUT HI
SHD
V GUARD
2wr COMP–
OUTPUT LO
HS
SENSE HI
LS
SENSE LO
SHD
V GUARD
