NI-9250 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-9250 Pinout



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

Input Characteristics

Number of channels

2 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

Internal master timebase (fM)

Frequency

13.1072 MHz

Accuracy

±100 ppm maximum

Data rate range (fs)
Using internal master timebase

Minimum

267 S/s

Maximum

102.4 kS/s

Using external master timebase

Minimum

244.141 S/s

Maximum

102.734 kS/s

Data rate

fs=fM4⁢×a×b 

Input delay[1]1 2.7 μs is applicable for DC to 40 kHz in DC coupling and 50 Hz to 40 kHz in AC coupling.

34/fs + 2.7 μs

Overvoltage protection

±30 V maximum on one channel at a time

Input impedance

AI+ to chassis

2 MΩ || 280 pF

AI- to chassis

50 Ω

Input voltage range

Minimum

±5 Vpk

Typical

±5.1 Vpk

Scaling coefficient

608,896 pV/LSB

Maximum input voltage

AI+ to Ground

±5.14 Vpk

AI- to Ground (Common Mode)

±0.11 V

IEPE excitation current (software-selectable on/off)

Minimum

2 mA

Typical

2.1 mA

IEPE excitation noise

70 nArms at 102.4 kS/s

IEPE compliance voltage[2]2

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

where
  • Vcommon-mode is the common-mode voltage applied to the NI-9250
  • Vbias is the bias voltage of the IEPE sensor
  • Vfull-scale is the full-scale voltage of the IEPE sensor

19 V maximum

High pass filter cutoff frequency (AC)

-3 dB

0.43 Hz

-0.1 dB

2.77 Hz

Figure 1. High Pass Filter Frequency Response


Table 2. Accuracy in DC Coupling
Measurement Conditions Percent of Reading (Gain Error) Percent of Range[3]3 Range equals 5 Vpk (Offset Error)
Maximum (-40 °C to 70 °C) ±0.20% ±0.15%
Typical (23 °C, ±5 °C) ±0.05% ±0.025%

Offset error (AC coupling)

±0.025%

Stability of Accuracy

Gain drift

5.5 ppm/°C

Offset drift

33 μV/°C

Passband, -0.1 dB

Frequency

0.4 * fs

Flatness (peak-to-peak)

DC to 20 kHz

0.03 dB maximum, 0.02 dB typical

DC to 40 kHz

0.09 dB maximum, 0.06 dB typical

Phase linearity
DC coupling

DC to 20 kHz

0.03° maximum

DC to 40 kHz

0.21° maximum

AC coupling

100 Hz to 40 kHz

0.21° maximum

Channel-to-channel mismatch
Gain

DC to 20 kHz

0.065 dB maximum

DC to 40 kHz

0.11 dB maximum

Phase (fin in kHz)

f in * 0.035° maximum

Stopband

Frequency

0.499 * fs

Rejection

105 dB

Alias free bandwidth

0.5 * fs

Alias rejection, at oversample rate

f s = 102.4 kS/s

100 dB at 3.2768 MHz

f s = 267 S/s

80 dB at 273 kHz

Table 3. Idle Channel Noise
Data Rate (S/s) ADC Decimation Ratio AC or DC Coupling (μVrms) IEPE Mode with AC Coupling (μVrms)
102,400 32 9.9 13.2
51,200 64 6.7 8.7
25,600 128 4.7 6.1
12,800 256 3.4 4.3
6,400 512 2.5 3.1
3,200 1,024 2.0 2.3
Note The noise specifications assume the NI-9250 is using the internal master timebase frequency of 13.1072 MHz.
Spectral noise density

AC or DC coupling

38⁢ ⁢nV⁢Hz⁢at  1 kHz

IEPE mode with AC coupling

50⁢ ⁢nV⁢Hz⁢at 1 kHz

Figure 1. Spectral Noise Density versus Frequency


Table 4. Dynamic Range (At 1 kHz Input Frequency, -60 dBF amplitude, BW=0.5 * fs)
Data Rate (S/s) ADC Decimation Ratio AC or DC Coupled (dBFS) IEPE Mode with AC Coupling (dBFS)[4]4 Excluding IEPE current noise
102,400 32 111 108
51,200 64 114 112
25,600 128 117 115
12,800 256 120 118
6,400 512 123 121
3,200 1,024 125 123
Crosstalk (CH to CH)

f in ≤ 1 kHz

-145 dB

f in ≤ 20 kHz

-125 dB

f in ≤ 40 kHz

-120 dB

CMRR, fin ≤ 1 kHz

53 dB minimum

Intermodulation distortion (IMD)[5]5 Test standards:
  • SMPTE 60 Hz + 7 kHz, amplitude ratio 4:1 with total amplitude at 0 dBFS
  • CCIF 14 kHz + 15 kHz, amplitude ratio 1:1 with each tone amplitude at -6 dBFS
Up to fifth order harmonic

SMPTE 60 Hz + 7 kHz

-101 dB

CCIF 14 kHz + 15 kHz

-103 dB

Non-harmonic SFDR[6]6 Tested with 1 kHz-60 dBFS input at 102.4 kS/s

138 dBFS

Total Harmonic Distortion (THD) at -1 dBFS
f s = 51.2 kS/s

1 kHz

-111 dBc

20 Hz to 22 kHz

-109 dBc

f s = 102.4 kS/s

8 kHz

-107 dBc

20 Hz to 44 kHz

-100 dBc

Figure 1. FFT of -1 dBFS, 1 kHz Tone Sampled at 51.2 kS/s (Unaveraged Computation of 65,536 Samples)


Figure 1. FFT of -1 dBFS, 8 kHz Tone Sampled at 102.4 kS/s (Unaveraged Computation of 262,144 Samples)


Figure 1. THD versus Frequency


Total Harmonic Distortion + Noise (THD+N) at -1 dBFS
f s = 51.2 kS/s

1 kHz

-110 dBc

20 Hz to 22 kHz

-108 dBc

f s = 102.4 kS/s

8 kHz

-106 dBc

20 Hz to 44 kHz

-100 dBc

Figure 1. THD+N versus Frequency


Power Requirements

Power consumption from chassis

Active mode

0.96 W maximum

Sleep mode

53 μW maximum

Thermal dissipation (at 70 °C)

Active mode

1.30 W maximum

Sleep mode

0.36 W maximum

Physical Characteristics

Dimensions

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

Weight

140 g (4.9 oz)

Safety Voltages

Connect only voltages that are within the following limits:

Channel-to-earth ground

±30 V maximum, Measurement Category I

Isolation

Channel-to-channel

None

Channel-to-earth ground

None

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.

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9250 at ni.com/calibration.

Calibration interval

2 years

1 2.7 μs is applicable for DC to 40 kHz in DC coupling and 50 Hz to 40 kHz in AC coupling.

2

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

where
  • Vcommon-mode is the common-mode voltage applied to the NI-9250
  • Vbias is the bias voltage of the IEPE sensor
  • Vfull-scale is the full-scale voltage of the IEPE sensor

3 Range equals 5 Vpk

4 Excluding IEPE current noise

5 Test standards:

  • SMPTE 60 Hz + 7 kHz, amplitude ratio 4:1 with total amplitude at 0 dBFS
  • CCIF 14 kHz + 15 kHz, amplitude ratio 1:1 with each tone amplitude at -6 dBFS
Up to fifth order harmonic

6 Tested with 1 kHz-60 dBFS input at 102.4 kS/s