©
National Instruments Corporation
41
NI 4070/4072 Calibration Procedure
Note
The default user password for adjusting the NI 4070/4072 is
NI
. Use
niDMM_SetCalPassword
to change the password.
4.
Call
niDMM_ConfigurePowerLineFrequency
with
PowerLine
Frequency
set to
50
or
60
, depending on the power line frequency
(in hertz) that your instruments are powered from; select
50
for
400 Hz power line frequencies.
5.
Output 100 mV on the calibrator with the range locked to 2.2 V.
6.
Call
niDMM_CalAdjustGain
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_VOLTS
•
Range
=
0.1
•
Input Resistance
=
NIDMM_VAL_10_MEGAOHM
•
Expected Value
=
0.1
7.
Output –100 mV on the calibrator.
8.
Call
niDMM_CalAdjustGain
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_VOLTS
•
Range
=
0.1
•
Input Resistance
=
NIDMM_VAL_10_MEGAOHM
•
Expected Value
=
–0.1
9.
Output 10 V on the calibrator.
10. Call
niDMM_CalAdjustGain
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_VOLTS
•
Range
=
10
•
Input Resistance
=
NIDMM_VAL_GREATER_THAN_10_GIGAOHM
•
Expected Value
=
10
11. Output –10 V on the calibrator.
12. Call
niDMM_CalAdjustGain
with the following parameters:
•
Mode
=
NIDMM_VAL_DC_VOLTS
•
Range
=
10
•
Input Resistance
=
NIDMM_VAL_GREATER_THAN_10_GIGAOHM
•
Expected Value
=
–10
13. Disconnect the Fluke 5440 cable from the NI 4070/4072 banana plug
connectors, leaving the other end of the cable connected to the
calibrator binding posts.
14. Plug in the insulated banana plug shorting bar across the
HI
and
LO
banana plug connectors of the NI 4070/4072.
15. Wait two minutes for the thermal EMF to stabilize.