![background image](http://html1.mh-extra.com/html/national-instruments/ni-pxi-4070/ni-pxi-4070_manual_3602823045.webp)
©
National Instruments Corporation
45
NI PXI-4070 Calibration Procedure
45. Call
niDMM_CalAdjustOffset
with the following parameters:
•
Mode
=
NIDMM_VAL_4_WIRE_RES
•
Range
=
10e3
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
46. Call
niDMM_CalAdjustMisc
with
Type
set to
NIDMM_EXTCAL_MISCAL_RREF
.
47. Call
niDMM_SelfCal
to self-calibrate the NI 4070.
48. Output 0
Ω
on the calibrator with external sense turned on, but with
2-wire compensation turned off.
49. Call
niDMM_CalAdjustOffset
with the following parameters:
•
Mode
=
NIDMM_VAL_4_WIRE_RES
•
Range
=
10e6
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
50. Call
niDMM_CalAdjustOffset
with the following parameters:
•
Mode
=
NIDMM_VAL_4_WIRE_RES
•
Range
=
1e6
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
51. Call
niDMM_CalAdjustOffset
with the following parameters:
•
Mode
=
NIDMM_VAL_4_WIRE_RES
•
Range
=
1e3
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
52. Call
niDMM_CalAdjustOffset
with the following parameters:
•
Mode
=
NIDMM_VAL_4_WIRE_RES
•
Range
=
100
•
Input Resistance
=
NIDMM_VAL_RESISTANCE_NA
53. Make the following changes to the connections between the calibrator
and the calibration cable assembly spade lugs:
a.
Remove the spade lugs labeled
HS
and
LS
from the calibrator.
Leave these spade lugs unplugged and ensure that they do not
touch each other.
b.
Reconnect the 2wr COMP+ spade lug to the SENSE HI binding
post of the calibrator.
c.
Reconnect the 2wr COMP– spade lug to the SENSE LO binding
post of the calibrator.
54. Wait two minutes for the thermal EMF to stabilize.
55. Output 0
Ω
on the calibrator with external sense and 2-wire
compensation turned on.