NI-9232 Specifications

NI-9232 Specifications

These specifications apply to the NI-9232.

Revision History

Version Date changed Description
378863B-01 February 2025 Updated the analog input accuracy table.
378863A-01 December 2022 Initial release.

Looking For Something Else?

For information not found in the specifications for your product, such as operating instructions, browse Related Information.

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.

Connector Types

The NI-9232 has more than one connector type: NI-9232 with screw terminal and NI-9232 with BNC. Unless the connector type is specified, NI-9232 refers to both connector types.

NI-9232 Pinout



Note You must use 2-wire ferrules to create a secure connection when connecting more than one wire to a single terminal on the NI-9232 with screw terminal.

Each channel has a terminal to which you can connect a signal source. The AI+ terminal of the connector provides the DC excitation, when enabled, and the positive input signal connection. The AI- terminal provides the excitation return path and the signal ground reference.

Table 1. Signal Descriptions
Signal Description
AI+ Positive analog input signal connection
AI- Negative analog input signal connection

Input Characteristics

Number of channels 3 analog input channels
ADC resolution 24 bits
Type of ADC Delta-Sigma (with analog prefiltering)
Sampling mode Simultaneous
Type of TEDS supported IEEE 1451.4 TEDS Class I
TEDS capacitive drive 3,000 pF
Table 2. Internal master timebase ( fM)
Frequency 13.1072 MHz
Accuracy ±100 ppm
Table 3. Data rate range ( fs) using internal master timebase
Minimum 0.985 kS/s
Maximum 102.4 kS/s
Table 4. Data rate range ( fs) using external master timebase
Minimum 0.977 kS/s
Maximum 102.73 kS/s
Figure 1. Data Rates (fs)
fM2×m×n

m = 64, 128, 256
n = 1, 2, …, 26

Input coupling AC/DC (software-selectable)
Table 5. AC cutoff frequency
-3 dB 0.1 Hz
-0.1 dB 0.87 Hz maximum
Figure 2. AC Cutoff Frequency Response


Table 6. DC voltage input range
Minimum ±30.87 V
Typical ±31.5 V
Maximum ±32.13 V
Table 7. AC voltage full-scale range[1]1 The DC + AC voltage must be below the overvoltage protection of the NI-9232.
Minimum ±30.87 V peak
Typical ±31.5 V peak
Maximum ±32.13 V peak
Channel-to-channel common-mode voltage range (AI- to AI-) ±1 V maximum
Table 8. IEPE excitation current (software-selectable on/off)
Minimum 4 mA
Typical 4.25 mA
IEPE excitation noise 100 nA rms
IEPE compliance voltage 22 V minimum

If you are using an IEPE sensor, use the following equation to make sure your configuration meets the IEPE compliance voltage range.

Figure 3. IEPE Compliance Voltage Range
(0.67×Vcommon-mode+Vbias±Vfull-scale)  ⁢

where

  • V common-mode is the channel-to-channel common-mode voltage across two or more channels
  • V bias is the bias voltage of the IEPE sensor
  • V full-scale is the full-scale voltage of the IEPE sensor
Note This equation must resolve to 0 V to 22 V.
Table 9. IEPE fault detection[2]2 Refer to the software help for information on reading the IEPE fault detection status.
Short circuit V AI < 1.5 V
Open loop V AI > 24 V
Overvoltage protection ±45 V for a low impedance source connected between any two terminals
Table 10. Input delay
64x decimation 30/fs + 3.0 μs
128x decimation 29/fs + 3.0 μs
256x decimation 28/fs + 3.0 μs
Table 11. Accuracy
Measurement Conditions Within 1 Year of Calibration Within 10 Years of Calibration
Percent of Reading Gain Error Offset[3]3 DC coupled (Percent of Range)[4]4 Range equals 31.5 V Percent of Reading Gain Error Offset[5]5 DC coupled (Percent of Range)[6]6 Range equals 31.5 V
Calibrated Typical (23 °C, ±5 °C) 0.10% 0.023% 0.31% 0.148%
Maximum (-40 °C to 70 °C) 0.60% 0.230% 0.67% 0.269%
Uncalibrated[7]7 Uncalibrated accuracy refers to the accuracy achieved when acquiring data in raw or unscaled modes and in which calibration constants that are stored in the module are not applied to the data. Typical (23 °C, ±5 °C) 0.40% 0.120% 0.61% 0.245%
Maximum (-40 °C to 70 °C) 1.50% 0.590% 1.57% 0.629%
Note NI recommends a calibration interval of 1 year and only provides calibration services referencing the 1-year specification limits. If you choose to calibrate less often, the 10-year column provides predicted performance over this extended interval. Choose an appropriate interval based on your application requirements. Longer calibration intervals are more likely to result in As-Found calibration failures when the device is sent back for calibration and compared against the 1-year specification limits.
Table 12. Stability
Gain drift ±25 ppm/°C
Offset drift (DC coupled) ±320 μV/°C
Table 13. Gain Matching (Calibrated)
Frequency Band 20 Hz to 40.96 kHz
Typical Maximum
Channel-to-channel 25 mdB 120 mdB
Table 14. Phase Matching (Maximum)
Frequency Band 20 Hz to 40.96 kHz
Channel-to-channel (0.022°/kHz × fin) + 0.045°
Module-to-module (0.022°/kHz × fin) + 0.045° + (360° × fin /fM)
Passband frequency 0.4 · fs
Table 15. Flatness (Peak-to-Peak)
Frequency Band 20 Hz to 20.48 kHz 20 hz to 40.96 kHz
Typical 70 mdB 75 mdB
Maximum 75 mdB [8]8 For conformal coated version, the maximum flatness for 20 Hz to 20.48 kHz is 76 mdB. 100 mdB [9]9 For conformal coated version, the maximum flatness for 20 Hz to 40.96 kHz is 102 mdB.
Table 16. Phase Nonlinearity (Maximum)
Frequency Band 20 Hz to 20.48 kHz 20 Hz to 40.96 kHz
AC Coupled 0.31° 0.31°
DC Coupled 0.025° 0.19°
Table 17. Stopband
Frequency 0.5 · fs
Rejection 120 dB
Alias-free bandwidth 0.4 · fs
Oversample rate 64 · fs, 128 · fs, and 256 · fs
Table 18. Rejection at oversample rate[10]10 Rejection of analog prefilter at oversample rate.
f s = 10.24 kS/s 95 dB at 1.311 MHz
f s = 102.4 kS/s 120 dB at 6.554 MHz
Crosstalk ( fin = 1 kHz) -125 dB
Table 19. CMRR
Channel-to-channel ( fin ≤ 1 kHz)[11]11 For conformal coated version, channel-to-channel CMRR (fin<= 1 kHz) is 54 dB. 56 dB
Channel-to-earth ( fin = 60 Hz) 107 dB
Table 20. SFDR (fin = 1 kHz, -60 dBFS)
f s = 102.4 kS/s 120 dBFS
f s = 51.2 kS/s 123 dBFS
f s = 25.6 kS/s 126 dBFS
Table 21. Input Noise
Data Rate 102.4 kS/s 51.2 kS/s 25.6 kS/s
AC coupled 251 μV RMS 171 μV RMS 127 μV RMS
DC coupled 223 μV RMS 150 μV RMS 112 μV RMS
Table 22. Dynamic range ( fin = 1 kHz, -60 dBFS)
Data Rate 102.4 kS/s 51.2 kS/s 25.6 kS/s
AC coupled 99 dBFS 102 dBFS 105 dBFS
DC coupled 100 dBFS 103 dBFS 106 dBFS
Table 23. Input impedance
Differential 324 kΩ
AI- to isolated ground 50 Ω
Table 24. Total Harmonic Distortion (THD)
Input Amplitude 1 kHz 10 kHz
-10.5424 dBFS -95 dB -85 dB
-20 dBFS -95 dB -85 dB
Table 25. Intermodulation distortion (-10.5424 dBFS)
DIN 250 Hz/8 kHz4:1 amplitude ratio -80 dB
CCIF 11 kHz/12 kHz1:1 amplitude ratio -100 dB

Safety Voltages

Connect only voltages that are within the following limits.

Isolation

Channel-to-channel

None

Channel-to-earth ground

Continuous

60 V DC, Measurement Category I

Withstand

1,000 V RMS, verified by a 5 s dielectric withstand test

Measurement Category I

Warning Do not connect the product to signals or use for measurements within Measurement Categories II, III, or IV, or for measurements on MAINs circuits or on circuits derived from Overvoltage Category II, III, or IV which may have transient overvoltages above what the product can withstand. The product must not be connected to circuits that have a maximum voltage above the continuous working voltage, relative to earth or to other channels, or this could damage and defeat the insulation. The product can only withstand transients up to the transient overvoltage rating without breakdown or damage to the insulation. An analysis of the working voltages, loop impedances, temporary overvoltages, and transient overvoltages in the system must be conducted prior to making measurements.
Mise en garde Ne pas connecter le produit à des signaux dans les catégories de mesure II, III ou IV et ne pas l'utiliser pour des mesures dans ces catégories, ou des mesures sur secteur ou sur des circuits dérivés de surtensions de catégorie II, III ou IV pouvant présenter des surtensions transitoires supérieures à ce que le produit peut supporter. Le produit ne doit pas être raccordé à des circuits ayant une tension maximale supérieure à la tension de fonctionnement continu, par rapport à la terre ou à d'autres voies, sous peine d'endommager et de compromettre l'isolation. Le produit peut tomber en panne et son isolation risque d'être endommagée si les tensions transitoires dépassent la surtension transitoire nominale. Une analyse des tensions de fonctionnement, des impédances de boucle, des surtensions temporaires et des surtensions transitoires dans le système doit être effectuée avant de procéder à des mesures.

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.

Note Measurement Categories CAT I and CAT O are equivalent. These test and measurement circuits are for other circuits not intended for direct connection to the MAINS building installations of Measurement Categories CAT II, CAT III, or CAT IV.

Environmental Characteristics

Temperature

Operating

-40 °C to 70 °C

Storage

-40 °C to 85 °C

Humidity

Operating

10% RH to 90% RH, noncondensing

Storage

5% RH to 95% RH, noncondensing

Ingress protection

IP40

Pollution Degree

2

Maximum altitude

5,000 m

Shock and Vibration
Operating vibration

Random

5 g RMS, 10 Hz to 500 Hz

Sinusoidal

5 g, 10 Hz to 500 Hz

Operating shock

30 g, 11 ms half sine; 50 g, 3 ms half sine; 18 shocks at 6 orientations

To meet these shock and vibration specifications, you must panel mount the system.

Power Requirements

Power consumption from chassis

Active mode

1 W maximum

Sleep mode

25 μW maximum

Thermal dissipation (at 70 °C)

Active mode

1 W maximum

Active mode (BNC variant)

1.5 W maximum

Sleep mode

25 μW maximum

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

Connector securement

Securement type

Screw flanges provided

Torque for screw flanges

0.2 N · m (1.80 lb · in.)

Dimensions

Visit ni.com/dimensions and search by module number.

Weight

NI-9232 with screw terminal

142 g (5.0 oz)

NI-9232 with BNC

159 g (5.6 oz)

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9232 at ni.com/calibration.
Recommended calibration interval 1 year

1 The DC + AC voltage must be below the overvoltage protection of the NI-9232.

2 Refer to the software help for information on reading the IEPE fault detection status.

3 DC coupled

4 Range equals 31.5 V

5 DC coupled

6 Range equals 31.5 V

7 Uncalibrated accuracy refers to the accuracy achieved when acquiring data in raw or unscaled modes and in which calibration constants that are stored in the module are not applied to the data.

8 For conformal coated version, the maximum flatness for 20 Hz to 20.48 kHz is 76 mdB.

9 For conformal coated version, the maximum flatness for 20 Hz to 40.96 kHz is 102 mdB.

10 Rejection of analog prefilter at oversample rate.

11 For conformal coated version, channel-to-channel CMRR (fin<= 1 kHz) is 54 dB.