©
National Instruments Corporation
17
NI USB-9237 User Guide and Specifications
Overvoltage protection
between any two terminals..................... ± 30 V
Accuracy
Gain drift ................................................ 10 ppm/°C max
Offset drift
2.5 V excitation............................... 0.6
μ
V/V per °C
3.3 V excitation............................... 0.5
μ
V/V per °C
5 V excitation.................................. 0.3
μ
V/V per °C
10 V excitation................................ 0.2 mV/V per °C
Channel-to-channel matching (calibrated)
Phase nonlinerarity
0 to 1 kHz........................................ <0.001°
0 to 20 kHz...................................... ± 0.1°
Input delay.............................................. 4.8
μ
s + 38.4/
f
s
Passband
Frequency........................................ 0.45 ·
f
s
Flatness ........................................... 0.1 dB max
Error*
Percent of Reading
(Gain Error)
Percent of Range
(Offset Error)
†
Calibrated max (0 to 60 °C)
0.20%
0.25%
Calibrated typ (25 °C, ±5 °C)
0.05%
0.05%
Uncalibrated max (0 to 60 °C)
0.60%
0.35%
Uncalibrated typ (25 °C, ±5 °C)
0.20
0.1%
* Excluding offset null or shunt calibration.
† Range equals 25 mV/V.
Input Signal Frequency
(
f
in
)
Gain
Phase
Typical
Maximum
Maximum
0 to 1 kHz
0.15%
0.3%
0.125°/kHz ·
f
in
*
1 to 20 kHz
0.4%
1.1%
*
f
in
is in kHz.
