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National Instruments Corporation
55
NI PXI-4070 Calibration Procedure
To adjust the current modes of the NI 4070, complete the following steps:
1.
Reset the calibrator.
Caution
Step 2 must be performed correctly to avoid shorting on unconnected spade lugs.
2.
Connect the calibration cable assembly with the connector block
plugged into the NI 4070 and with the spade lugs connected to the
appropriate binding posts on the calibrator, as described in Figure 3
and Table 1.
3.
Connect a banana-to-banana cable or a wire (AWG
≤
22) between the
the
AUX CURRENT
binding post and the
SENSE HI
binding post of
the calibrator.
4.
Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_DC_CURRENT
•
Range
=
0.02
5.
Call
niDMM_Read
to configure the NI 4070 for a current mode before
applying current.
6.
Output 20 mA on the calibrator with the current output set to
AUX
.
7.
Call
niDMM_CalAdjustGain
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_CURRENT
•
Range
=
0.02
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
•
Expected Value
=
0.02
8.
Output –20 mA on the calibrator with the current output set to
AUX
.
9.
Call
niDMM_CalAdjustGain
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_CURRENT
•
Range
=
0.02
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
•
Expected Value
=
–0.02
10. Output 0 A on the calibrator with the current output set to
AUX
.
11. Call
niDMM_CalAdjustOffset
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_CURRENT
•
Range
=
0.02
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA