NI 4071 7½-Digit FlexDMM Calibration Procedure
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© National Instruments
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3
Test Conditions
Follow these guidelines to optimize the connections and the environment during calibration:
•
Ensure that the PXI chassis fan speed is set to
HI
and that the fan filters are clean.
•
Use PXI filler panels in all vacant slots to allow proper cooling.
•
Plug the PXI chassis and the calibrator into the same power strip to avoid ground loops.
•
Power on and warm up both the calibrator and the NI 4071 for at least 60 minutes before
beginning this calibration procedure.
•
Maintain an ambient temperature of 23 ±1 °C.
•
Maintain an ambient relative humidity of less than 60%.
A means of creating a short (
100 m
with
low thermal EMF (
150 nV) across the HI
and LO input banana plug connectors on the
NI 4071
Pomona 5145 insulated double banana plug
shorting bar
Two sets of banana-to-banana cables with
length not to exceed 4 in.
Two Pomona B-4 banana-to-banana patch
cords (cables)
Double banana plug with binding posts
Pomona 5405 Binding Post
Insulated low thermal electromotive force
(EMF) spade lugs
Two Pomona 2305 lugs
Chassis
National Instruments PXI chassis and
controller
A device capable of generating pulse trains
at the frequencies listed in Table 27
NI PXI-6608 counter/timer module or
Agilent 33250a function/arbitrary waveform
generator
Any additional equipment needed to connect
the external frequency source to the NI 4071
NI TB-2715 terminal block
Shielded cable
NI SH68-68-D1 shielded cable
Double banana plug with strain relief
Pomona MDP 4892 double banana plug with
strain relief
Coaxial cable
RG178
1 G
reference standard resistor
IET Labs SRL-1G
*
The 90-day DC current uncertainty of the Fluke 5720A is not adequate to calibrate the 100 µA and
1 mA DC current ranges on the NI 4071. See Table 13 in the
section for
information on the required uncertainty.
Table 1.
Required Test Equipment (Continued)
Required Equipment
Recommended Models