©
National Instruments Corporation
15
NI USB-9229/9239 User Guide and Specifications
Accuracy, NI USB-9229
Accuracy, NI USB-9239
Input noise
NI USB-9229 .................................. 320
μ
V
rms
NI USB-9239 .................................. 70
μ
V
rms
Stability
Gain drift......................................... ±5 ppm/°C
Offset drift
NI USB-9229 ........................... ±150
μ
V/°C
NI USB-9239 ........................... ±24
μ
V/°C
Post calibration gain match
(ch-to-ch, 20 kHz) .................................. 0.22 dB max
Crosstalk (1 kHz) ................................... –130 dB
Phase mismatch (ch-to-ch)
NI USB-9229 .................................. 0.045°/kHz max
NI USB-9239 .................................. 0.075°/kHz max
Phase mismatch (module-to-module, max)
Error
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated max (–0 to 60 °C)
±0.13%
±0.05%
Calibrated typ (25 °C, ±5 °C)
±0.03%
±0.008%
Uncalibrated max (0 to 60 °C)
±1.2%
±0.55%
Uncalibrated typ (25 °C, ±5 °C)
±0.3%
±0.11%
*
Range equals 62.64 V
Error
Percent of
Reading
(Gain Error)
Percent of
Range*
(Offset Error)
Calibrated max (0 to 60 °C)
±0.13%
±0.05%
Calibrated typ (25 °C, ±5 °C)
±0.03%
±0.008%
Uncalibrated max (0 to 60 °C)
±1.4%
±0.67%
Uncalibrated typ (25 °C, ±5 °C)
±0.3%
±0.11%
*
Range equals 10.52 V
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