NI-9238 Specifications
- Updated2024-11-11
- 6 minute(s) read
NI-9238 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. All voltages are relative to the AI- signal on each channel unless otherwise noted.
NI-9238 Pinout
Signal | Description |
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AI+ | Positive analog input signal connection |
AI- | Negative analog input signal connection |
Input Characteristics
Number of channels | 4 analog input channels | ||||||
ADC resolution | 24 bits | ||||||
Type of ADC | Delta-Sigma (with analog prefiltering) | ||||||
Sampling mode | Simultaneous | ||||||
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Data rates (fs) |
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Typical scaling coefficient | 74.506 nV/LSB | ||||||
Overvoltage protection | ±30 V | ||||||
Input coupling | DC | ||||||
Input impedance (AI+ to AI-) | >1 GΩ |
Measurement Conditions | Percent of Reading (Gain Error) | Percent of Range[1]1 Range equals 0.5 V. (Offset Error) | |
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Calibrated | Maximum (-40 °C to 70 °C) | ±0.20% | ±0.06% |
Typical (23 °C ±5 °C) | ±0.07% | ±0.005% | |
Uncalibrated[2]2 Uncalibrated accuracy refers to the accuracy achieved when acquiring in raw or unscaled modes where the calibration constants stored in the module are not applied to the data. | Maximum (-40 °C to 70 °C) | ±1.8% | ±0.3% |
Typical (23 °C ±5 °C) | ±0.7% | ±0.1% |
Input noise | 3.9 μV RMS | ||||||
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Post calibration gain match (ch-to-ch, 20 kHz) | 100 mdB maximum | ||||||
Phase mismatch (ch-to-ch, 20 kHz) | 0.13°/kHz maximum | ||||||
Phase mismatch (module-to-module, maximum) | (0.13°/kHz · fin) + (360° · fin/fM) | ||||||
Phase nonlinearity (fs = 50 kS/s) | 0.12° maximum | ||||||
Input delay |
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Alias-free bandwidth | 0.453 · fs | ||||||
-3 dB bandwidth (fs = 50 kS/s) | 24.6 kHz | ||||||
Crosstalk (0 kHz to 24.6 kHz) | -115 dB | ||||||
CMRR (fin = 60 Hz) | 140 dB | ||||||
Spurious-Free Dynamic Range (SFDR) 1 kHz, -60 dB FS | 110 dB | ||||||
Total Harmonic Distortion (THD) 1 kHz, -1 dB FS | -85 dB |
Safety Voltages
Connect only voltages that are within the following limits.
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Division 2 and Zone 2 hazardous locations applications (Channel-to-channel and channel-to-earth ground) | 60 V DC, Measurement Category I |
Measurement Category
Measurement Category I
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.
Measurement Category II
Measurement Category II is for measurements performed on circuits directly connected to the electrical distribution system. This category refers to local-level electrical distribution, such as that provided by a standard wall outlet, for example, 115 V for U.S. or 230 V for Europe.
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
Screw-terminal wiring
Gauge | 0.05 mm2 to 1.5 mm2 (30 AWG to 14 AWG) copper conductor wire | ||||||
Wire strip length | 6 mm (0.24 in.) of insulation stripped from the end | ||||||
Temperature rating | 90 °C, minimum | ||||||
Torque for screw terminals | 0.22 N · m to 0.25 N · m (1.95 lb · in. to 2.21 lb · in.) | ||||||
Wires per screw terminal | One wire per screw terminal; two wires per screw terminal using a 2-wire ferrule | ||||||
Ferrules | 0.25 mm2 to 1.5 mm2 | ||||||
Weight | 146 g (5.15 oz) | ||||||
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Calibration
Calibration interval | 1 year |