©
National Instruments Corporation
3
NI USB-443x Calibration Procedure
Test Equipment
Table 1 lists the equipment National Instruments recommends for calibrating the NI USB-443
x
.
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
1 kHz
*
DC Voltage Accuracy:
±150 ppm at 9 V
±100
μ
V 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
μ
V
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.
