NI-9231 Specifications
- Updated2024-11-11
- 7 minute(s) read
NI-9231 Specifications
Definitions
Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.
Characteristics describe values that are relevant to the use of the model under stated operating conditions but are not covered by the model warranty.
- Typical specifications describe the performance met by a majority of models.
- Nominal specifications describe an attribute that is based on design, conformance testing, or supplemental testing.
Specifications are Typical unless otherwise noted.
Conditions
Specifications are valid for the range -40 °C to 70 °C unless otherwise noted.
NI-9231 Pinout
Signal | Description |
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AI+ | Positive analog input signal connection |
AI- | Negative analog input signal connection |
Input Characteristics
Number of channels | 8 analog input channels | ||||||||||||||||||
ADC resolution | 24 bits | ||||||||||||||||||
Type of ADC | Delta-Sigma with analog prefiltering | ||||||||||||||||||
Sampling mode | Simultaneous | ||||||||||||||||||
Input coupling | Software-selectable AC/DC | ||||||||||||||||||
Type of TEDS supported | IEEE 1451.4 TEDS Class I | ||||||||||||||||||
TEDS capacitive drive | 5,000 pF | ||||||||||||||||||
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Data rate |
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Input delay | 34/fs + 3.0 μs | ||||||||||||||||||
Overvoltage protection | ±30 V maximum on one channel at a time | ||||||||||||||||||
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IEPE excitation noise | 75 nArms at 51.2 kS/s | ||||||||||||||||||
IEPE compliance voltage | 19 V maximum |
If you are using an IEPE sensor, use the following equation to make sure your configuration meets the IEPE compliance voltage range.
(Vcommon-mode + Vbias ± Vfull-scale) must be 0 V to 19 V
- Vcommon-mode is the common-mode voltage applied to the NI-9231
- Vbias is the bias voltage of the IEPE sensor
- Vfull-scale is the full-scale voltage of the IEPE sensor
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Measurement Conditions | Percent of Reading (Gain Error) | Percent of Range[1]1 Range equals 5 V peak (Offset Error) |
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Maximum (-40 °C to 70 °C) | ±0.220% | ±0.075% |
Typical (23 °C, ±5 °C) | ±0.039% | ±0.016% |
Offset error (AC coupling) | ±0.151%, maximum | ||||||
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Alias free bandwidth | 0.5 * fs | ||||||
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Data Rate (S/s) | Decimation Rate | AC or DC Coupling (μV RMS) | Spectral Noise Density (nV/√Hz) at 1 kHz |
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51,200 | 64 | 15.5 | 104 |
34,133 | 32 | 19.4 | 159 |
25,600 | 128 | 10.9 | 104 |
12,800 | 256 | 7.8 | 103 |
6,400 | 512 | 5.6 | 103 |
3,200 | 1,024 | 4.1 | 103 |
Data Rate (S/s) | Decimation Rate | AC or DC Coupled (dBFS) |
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51,200 | 64 | 107 |
34,133 | 32 | 105 |
25,600 | 128 | 110 |
12,800 | 256 | 113 |
6,400 | 512 | 116 |
3,200 | 1,024 | 119 |
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CMRR, fin ≤ 1 kHz | 45 dB minimum |
Input Amplitude | 1 kHz | 10 kHz |
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-1 dBFS | -103 dBc | -83 dBc |
-10.97 dBFS | -107 dBc | -88 dBc |
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Non-harmonic SFDR[3]3 Tested with 1 kHz-60 dBFS input at 51.2 kS/s | 133 dBFS |
NI-9231 with
10-32 Coaxial Jack Safety Voltages
Connect only voltages that are within the following limits:
Channel-to-earth ground | ±30 V maximum, Measurement Category I | ||||||
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Measurement Category I is for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. MAINS is a hazardous live electrical supply system that powers equipment. This category is for measurements of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special equipment, limited-energy parts of equipment, circuits powered by regulated low-voltage sources, and electronics.
Environmental Characteristics
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Ingress protection | IP40 | ||||||||||||
Pollution Degree | 2 | ||||||||||||
Maximum altitude | 5,000 m | ||||||||||||
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To meet these shock and vibration specifications, you must panel mount the system.
Power Requirements
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Physical Characteristics
Dimensions | Visit ni.com/dimensions and search by module number. |
Weight | 164 g (5.8 oz) |
Calibration
You can obtain the calibration certificate and information about calibration services for the at ni.com/calibration.
Calibration Interval | 2 years |