©
National Instruments Corporation
25
NI 4070/4072 Calibration Procedure
You have completed verifying the 4-wire resistance of the NI 4070/4072.
Select one of the following options:
•
If you want to continue verifying other modes, go to the
•
If you do
not
want to verify other modes
and
you are performing a
post-adjustment
verification, go to the
section.
•
If you do
not
want to verify any additional modes
and
you are
performing a
pre-adjustment
verification, call
niDMM_close
to close
the session.
Verifying 2-Wire Resistance
To verify the 2-wire resistance of the NI 4070/4072, complete the
following steps:
1.
Plug in the insulated banana plug shorting bar across the HI and LO
banana plug connectors on the NI 4070/4072.
2.
Wait one minute for the thermal EMF to stabilize.
3.
Call
niDMM_reset
.
4.
Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_2_WIRE_RES
•
Range
=
10e3
•
Resolution
=
0.01
5.
Call
niDMM_ConfigureOffsetCompOhms
with
OffsetCompOhms
set to
NIDMM_VAL_OFFSET_COMP_OHMS_ON
.
6.
Call
niDMM_Read
. Verify that this measurement falls between the
limits listed in Table 20.
7.
Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_2_WIRE_RES
•
Range
=
1e3
•
Resolution
=
1e–3
8.
Call
niDMM_ConfigureOffsetCompOhms
with
OffsetCompOhms
set to
NIDMM_VAL_OFFSET_COMP_OHMS_ON
.
9.
Call
niDMM_Read
. Verify that this measurement falls between the
limits listed in Table 20.