©
National Instruments Corporation
11
NI PXI-4070 Calibration Procedure
Note
You will use the
Session
in all subsequent function calls throughout the verification
procedures.
For more information on using the
niDMM_init
function, refer to the
NI Digital Multimeters Help
.
4.
Call
niDMM_SelfCal
. This step is optional if you have adjusted the
NI 4070 within the last 24 hours and the temperature has remained
constant to within ±1 °C of the calibration temperature (T
cal
).
Verifying DC Voltage
To verify DC voltage of the NI 4070, 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.
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_DC_VOLTS
•
Range
=
1
•
Resolution
=
1e–6
5.
Set the input resistance of the NI 4070 to >10 G
Ω
by calling
niDMM_SetAttributeViReal64
with the following parameters:
•
Attribute_ID
=
NIDMM_ATTR_INPUT_RESISTANCE
•
Attribute_Value
=
NIDMM_VAL_GREATER_THAN_10_GIGAOHM
6.
Call
niDMM_Read
. Verify that this measurement falls between the
limits listed in Table 11.
7.
Set the input resistance of the NI 4070 to 10 M
Ω
by calling
niDMM_SetAttributeViReal64
with the following parameters:
•
Attribute_ID
=
NIDMM_ATTR_INPUT_RESISTANCE
•
Attribute_Value
=
NIDMM_VAL_10_MEGAOHM
8.
Call
niDMM_Read
. Verify that this measurement falls between the
limits listed in Table 11.
9.
Call
niDMM_ConfigureMeasurement
with the following
parameters:
•
Function
=
NIDMM_VAL_DC_VOLTS
•
Range
=
10
•
Resolution
=
1e–6
