NI-9235 and sbRIO-9236 Specifications

Connector Types

The NI-9235 is available in two types: push-in spring terminal and spring terminal. The push-in type spring terminal connector is black and orange. The spring terminal connector is black. NI-9235 refers to both types unless the two types are specified. Differences between the two types of spring terminal connectors are noted by the connector color.

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.

Input Characteristics

Number of channels

8 analog input channels

Quarter-bridge completion

120 Ω, 10 ppm/°C maximum

ADC resolution

24 bits

Type of ADC

Delta-Sigma (with analog prefiltering)

Sampling mode

Simultaneous

Internal master timebase (fM)

Frequency

12.8 MHz

Accuracy

±100 ppm maximum

Data rate range (fs) using internal master timebase

Minimum

794 S/s

Maximum

10 kS/s

Data rate range (fs) using external master timebase

Minimum

195.3125 S/s

Maximum

10.547 kS/s

Data rates[1]1 The data rate must remain within the appropriate data rate range. (fs)

(fM ÷ 256)/n, n = {2; 4, 5, ..., 63}

Full-scale range

±29.4 mV/V (+62,500 με/-55,500 με)

Scaling coefficient

3.5062 nV/V per LSB

Overvoltage protection between any two terminals

±30 V

Table 1. Accuracy
Measurement Conditions Percent of Reading[2]2 Excusive of lead wire resistance error. (Gain Error) Percent of Range[3]3 Range equals 29.4 mV/V.,[4]4 Calibrated errors represent offset stability following unstrained measurement. Errors include the effect of completion resistor tolerance and drift. (Offset Error)
30 days after cal. (±5 °C) 1 year after cal. (±5 °C)
Calibrated Typical (25 °C, ±5 °C) 0.02% 0.1% 0.15%
Maximum (-40 °C to 70 °C) 0.07% 0.17% 0.4%
Uncalibrated[5]5 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. Typical (25 °C, ±5 °C) 0.15% 1.25%
Maximum (-40 °C to 70 °C) 0.53% 2.14%
Stability

Gain drift

6 ppm/°C

Offset drift

2.2 μV/V/°C

Table 2. Channel-to-Channel Matching (Calibrated)
Input Signal Frequency (fin) Gain Phase
Typical Maximum Maximum
0 to 1 kHz 0.08% 0.11% 0.34°/kHz * fin
0 to 4 kHz 0.17% 0.32%
Phase nonlinearity

f in = 0 to 1 kHz

±0.002°

f in = 0 to 4 kHz

±0.1°

Input delay

(39 + 221/1024)/fs + 12 μs

Passband

Frequency

0.45 * fs

Flatness (fs = 10 kS/s)

33 mdB maximum

Stopband

Frequency

0.55 * fs

Rejection

100 dB

Alias-free bandwidth

0.45 * fs

Oversample rate

64 * fs

Rejection at oversample rate[6]6 Rejection by analog prefilter of signal frequencies at oversample rate.(fs = 10 kS/s)

80 dB @ 640 kHz

Input noise

f s = 1 kS/s

0.38 μV/V RMS

f s = 10 kS/s

0.85 μV/V RMS

SFDR (1 kHz, -60 dBFS)

110 dB

THD (1 kHz, -20 dBFS)

-90 dB

Crosstalk (fin = 1 kHz)

-100 dB

Common-mode voltage, all signals to earth ground

±60 VDC

CMRR (fin = 0 to 60 Hz)

120 dB

MTBF

566,796 hours at 25 °C; Bellcore Issue 2, Method 1, Case 3, Limited Part Stress Method

Shunt Calibration Characteristics

Table 3. Shunt Calibration Accuracy
Measurement Conditions Percent of Reading (Gain Error)
Typical (25 °C, ±5 °C) 0.09%
Maximum (-40 °C to 70 °C) 0.22%

Resistance

50 kΩ

Output value

-599.28 μV/V

Temperature drift

15 ppm/°C

Method

Shunt across completion resistor

Excitation Characteristics

Excitation type

Constant voltage

Excitation value

2.0 V ± 1%

Maximum output current

80 mA

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.

Safety Voltages

Connect only voltages that are within the following limits:

Between any two terminals

±30 V maximum

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.

Power Requirements

Power consumption from chassis

Active mode

735 mW maximum

Sleep mode

25 μW maximum

Thermal dissipation (at 70 °C)

Active mode

735 mW maximum

Sleep mode

25 μW maximum

Physical Characteristics

Weight

NI-9235 (black connector)

153 g (5.4 oz)

Push-in style NI-9235 (black/orange connector)

158 g (5.6 oz)

Dimensions

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

(Black Connector)

The NI-9235 (black connector) requires a flathead screwdriver with a 2.3 mm × 1.0 mm (0.09 in. × 0.04 in.) blade for signal connection; insert the screwdriver into a spring clamp activation slot to open the corresponding connector terminal, press a wire into the open connector terminal, and then remove the screwdriver from the activation slot to clamp the wire into place.

Spring terminal wiring

Gauge

0.8 mm2 to 1.0 mm2 (28 AWG to 18 AWG) copper conductor wire

Wire strip length

7 mm (0.276 in.) of insulation stripped from the end

Temperature rating

90 °C minimum

Wires per spring terminal

One wire per spring terminal

Connector securement

Securement type

Screw flanges provided

Torque for screw flanges

0.2 N · m (1.80 lb · in.)

Push-In Style (Black/Orange Connector)

The push-in spring style NI-9235 does not require a tool for signal connection; push the wire into the terminal when using solid wire or stranded wire with a ferrule, or by pressing the push button when using stranded wire without a ferrule.

Spring terminal wiring

Gauge

0.14 mm2 to 1.5 mm2 (26 AWG to 16 AWG) copper conductor wire

Wire strip length

10 mm (0.394 in.) of insulation stripped from the end

Temperature rating

90 °C minimum

Wires per spring terminal

One wire per spring terminal; two wires per spring terminal using a 2-wire ferrule

Ferrules

Single ferrule, uninsulated

0.14 mm2 to 1.5 mm2 (26 AWG to 16 AWG) 10 mm barrel length

Single ferrule, insulated

0.14 mm2 to 1.0 mm2 (26 AWG to 18 AWG) 12 mm barrel length

Two-wire ferrule, insulated

2x 0.34 mm2 (2x 22 AWG) 12 mm barrel length

Connector securement

Securement type

Screw flanges provided

Torque for screw flanges

0.2 N · m (1.80 lb · in.)

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9235 at ni.com/calibration.

Calibration interval

1 year

1 The data rate must remain within the appropriate data rate range.

2 Excusive of lead wire resistance error.

3 Range equals 29.4 mV/V.

4 Calibrated errors represent offset stability following unstrained measurement. Errors include the effect of completion resistor tolerance and drift.

5 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.

6 Rejection by analog prefilter of signal frequencies at oversample rate.