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© National Instruments Corporation 23 NI 4070/4072 Calibration Procedure
3. Wait two minutes for the thermal EMF to stabilize if the Fluke 5440
cables were not previously connected in this configuration.
4. Call
niDMM_reset.
5. Refer to Table 8 for the appropriate calibrator output and function
parameter values as you complete the following steps:
a. On the calibrator, output the value listed in the Calibrator Output
column in Table 8 for the current iteration. Make sure that the
external sense is turned on but 2-wire compensation is turned off.
Note After setting the calibrator output to 0 Ω in the seventh iteration, you do not need to
continually set the calibrator to 0 Ω for iterations 8 through 12.
b. Call
niDMM_ConfigureMeasurement with the parameters set
as shown in Table 8 for the current iteration.
c. Call
niDMM_ConfigureOffsetCompOhms with
OffsetCompOhms set to either
NIDMM_VAL_OFFSET_COMP_OHMS_ON or
NIDMM_VAL_OFFSET_COMP_OHMS_OFF according to Table 8 for
the current iteration.
d. Call
niDMM_Read. Verify that this measurement falls between the
tolerances listed in Table 17. Tolerances are provided instead of
absolute limits because your calibrator will have different discrete
resistance values.
Table 7. Fluke 5440 Cable Connections
Fluke 5440
Cable Identification
Banana Plug Connector
(NI 4070/4072)
Banana Plug Color
(Fluke 5440 Cable)
Binding Post
(Fluke 5700A/5720A Calibrator)
First cable HI Red OUTPUT HI
LO Black OUTPUT LO
(No connection) Blue V GUARD
Second cable HI SENSE Red SENSE HI
LO SENSE Black SENSE LO
(No connection) Blue V GUARD