National Instruments USB-443 Series - Test Equipment

© National Instruments Corporation 3 NI USB-443x Calibration Procedure
Test Equipment
Table 1 lists the equipment National Instruments recommends for calibrating the NI USB-443x.
If the recommended equipment is not available, select a substitute calibration standard that meets the
given specifications.
Table 1. Recommended Equipment
Equipment Recommended Model
Parameter
Measured/
Adjusted
Minimum Requirements
Calibrator Fluke 5700A AI AC Coupled
Gain
AI DC Coupled
Gain
AI Offset
Frequency Range: 1 kHz
Voltage Range: up to 9 V
pk
AC Voltage Accuracy: ± 0.03% at
1kHz
*
DC Voltage Accuracy:
±150 ppm at 9 V
±100 μV with 1 mA load current
Function Generator HP/Agilent 33250A Timebase
Frequency
Accuracy
Frequency Range: up to 10 kHz
Frequency Accuracy: ±5 ppm
†
Voltage Range: up to 9 V
pk
Digital Multimeter NI 4071 AO Gain
AO Offset
DC Voltage Resolution: 1 μV
DC Voltage Accuracy at 3.15 V:
±150 ppm
BNC Shorting Cap
NI USB-4431:
quantity 4
NI USB-4432:
quantity 5
Pomona Electronics 5085 AI Offset Resistance: <1 Ω
BNC Cables:
quantity 6
Pomona Electronics 5697 All Characteristic Impedance: 50 Ω
BNC (Female) to
Banana Adapter
Pomona Electronics 1269 All
BNC T-Connectors:
quantity 4
Pomona Electronics 4896 AI Gain
AI Offset
Characteristic Impedance: 50 Ω
*
AC accuracy is the sum of all errors, including percent of reading error and temperature error, but excluding percent of
range error.
†
Frequency accuracy is the sum of all errors, including initial accuracy and stability errors.