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NI 4070/4072 Calibration Procedure
56
ni.com
You have completed adjusting the current modes of the NI 4070/4072.
Select one of the following options:
•
If you are
calibrating an NI 4070, refer to one of the following
sections:
–
—to verify your new calibration
coefficients before saving them to the EEPROM
–
Completing the Adjustment Procedures
—if you do
not
want to
verify the adjustments you have just made
•
If you are calibrating an NI 4072, refer to the
section.
Adjusting Capacitance and Inductance
(NI 4072 Only)
•
If you are calibrating an NI 4070, skip this section and select one of the
following options:
–
If you want to verify the new calibration coefficients before saving
them to the EEPROM, repeat the
section
section).
–
If you do
not
want to verify the new calibration coefficients, go to
the
Completing the Adjustment Procedures
•
If you are calibrating an NI 4072, you
must
complete this section to
attain a valid calibration.
Caution
It is necessary to adjust DC voltage and resistance before running these
adjustment steps. During this procedure, be sure to keep hands and any other moving
objects away from the fixture after calling every function.
To adjust the capacitance and inductance of the NI 4072, complete the
following steps:
1.
Disconnect any fixtures or cables from the NI 4072.
2.
Call
niDMM_CalAdjustLC
with
Type
set to
NIDMM_EXTCAL_LC_OPEN
.
3.
Plug in the insulated banana plug shorting bar across the
HI
and
LO
banana plug connectors of the NI 4072.
4.
Call
niDMM_CalAdjustLC
with
Type
set to
NIDMM_EXTCAL_LC_SHORT
.
5.
Remove the shorting bar and plug the 25
Ω
resistor across the
HI
and
LO
banana plug connectors of the NI 4072. The leads between the
resistor and the NI 4072 terminals should be
≤
1 in.
6.
Wait 30 seconds for the thermal EMF to stabilize.