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Calibration Interval
............................................................................
Recommended calibration interval
1 year
Test Equipment
The following table lists the equipment NI recommends for the performance verification and
adjustment procedures. If the recommended equipment is not available, select a substitute
using the minimum requirements listed in the table.
Table 2.
Required Equipment for Calibration
Required
Equipment
Recommended
Model(s)
Parameter
Measured
Minimum Specifications
Digital
multimeter
(DMM)
Agilent 3458 A
All parameters
except remote
sense accuracy
Voltage: < ±9 ppm
accuracy and < 100 nV
resolution. Current: <
±25 ppm accuracy and <
10 pA resolution.
1 MΩ current
shunt
IET Labs SRL-1M
1 μA and 10 μA
current accuracy
< 4 ppm accuracy, <
0.2 ppm / °C tempco.
1 Ω current shunt Ohm Labs CS-1
1 A current
accuracy
<65 ppm accuracy, <
5 ppm / °C tempco.
333 mΩ current
shunt
Ohm Labs CS-3
3 A current
accuracy
< 120 ppm accuracy, <
5 ppm / °C tempco.
3 kΩ resistor
Vishay
PTF563K0000BYEB
Remote sense
accuracy
0.1% 250 mW
Test Conditions
The following setup and environmental conditions are required to ensure the NI 4138 meets
published specifications:
•
Keep cabling as short as possible. Long cables act as antennas, picking up extra noise that
can affect measurements.
•
Verify that all connections to the device, including front panel connections and screws,
are secure.
•
Ensure that the PXI chassis fan speed is set to HIGH, that the fan filters (if present) are
clean, and that the empty slots contain slot blockers and filler panels. For more
NI PXIe-4138 Calibration Procedure
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