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National Instruments Corporation
7
NI 4070/4072 Calibration Procedure
Note
Ensure that both the calibrator and the NI 4070/4072 (installed in a powered-on
PXI chassis or PC) are warmed up for at least 60 minutes before you begin this procedure.
3.
Call
niDMM_init
with the resource name of the device to create a
session. For more information on using
niDMM_init
, refer to the
NI Digital Multimeters Help
.
Note
You use this session in all subsequent function calls throughout the verification
procedures.
4.
Call
niDMM_SelfCal
. This step is optional if you have adjusted the
NI 4070/4072 within the last 24 hours and the temperature has
remained constant to within ±1 °C of the calibration temperature (T
cal
).
Verification Procedures
You can use the verification procedures described in this section for both
pre-adjustment and post-adjustment verification. The steps of each
verification procedure must be performed in the order listed; however, you
can omit entire sections (for example, the entire
section), if necessary.
The parameters
Range
,
Resolution
, and
Sample Interval
used in function
calls throughout this section have floating point values. For example, if
Range
=
1
, the floating point value is
1.0
. The parameters
Trigger Count
,
Sample Count
,
Array Size
, and
ParamValue
have integer values. Refer
to the
NI Digital Multimeters Help
for more information about parameter
values.
Note
Many of the parameter values listed in this document are expressed in scientific
notation. Some programming languages do not support the direct entry of numbers in this
format. Be sure to properly enter these values with the appropriate number of zeros. For
example, enter the scientific notation number 10e–6 as
0.00001
and the number 100e3 as
100000
. If your programming language supports scientific notation, NI recommends that
you use this feature to minimize possible data entry errors.
Verifying DC Voltage
To verify DC voltage 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
.