NI PXI-4070 Calibration Procedure
40
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For example, if
Range
=
1
, the floating point value is
1.0
. Refer to the
NI Digital Multimeters Help
for more information.
Note
NI recommends repeating the verification procedures after you perform these
adjustment procedures. Reverification ensures that the device you have calibrated is
operating within specifications after adjustments.
Caution
If you skip any of the steps within a section of the adjustment procedures,
NI-DMM does
not
allow you to store your new calibration coefficients. Instead, NI-DMM
restores the original coefficients to the EEPROM.
Setting Up the Test Equipment
If you have not already set up the test equipment, complete the following
steps:
1.
Remove all connections from the four input banana connectors on the
NI 4070.
2.
Verify that the calibrator has been calibrated within the time limits
specified in the
section, and that dc zeros
calibration has been performed within the last 30 days. Consult the
Fluke 5700A/5720A user documentation for instructions on
calibrating these devices.
Note
Ensure that the calibrator is warmed up for at least 30 minutes before you begin this
procedure.
3.
Reset the calibrator.
4.
If you have not already done so, allow the NI 4070 to warm up for
30 minutes within a powered-on PXI chassis.
Adjusting DC Voltage and Resistance
To adjust the DC voltage and resistance of the NI 4070, complete the
following steps:
Caution
Step 1 must be performed correctly to avoid shorting on unconnected spade lugs.
1.
Connect the calibration cable assembly with the connector block
plugged into the NI 4070 and with the spade lugs connected to the
appropriate binding posts on the calibrator, as described in Figure 3
and Table 1.
2.
Wait two minutes for the thermal EMF to stabilize if the calibration
cable assembly was not previously connected in this configuration.
