NI-9221 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 COM unless otherwise noted.

NI-9221 Pinout



Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
COM Common reference connection
NC No connection

Input Characteristics

Number of channels

8

ADC resolution

12 bits

Type of ADC

Successive approximation register (SAR)

Maximum Sample Rate (Aggregate)

R Series Expansion Chassis

475 kS/s

All Other Chassis

800 kS/s

Input range

±60 V

Measurement voltage, channel-to-COM (V)

Minimum

±61.4

Typical

±62.50

Maximum

±63.8

Overvoltage protection, channel-to-COM

±100 V

Table 2. NI-9221 Accuracy (Excludes Noise)
Measurement Conditions Percent of Reading (Gain Error) Percent of Range[1]1 Range equals 62.50 V (Offset Error)
Calibrated Typical (25 °C, ±5 °C) ±0.04% ±0.07%
Maximum (-40 °C to 70 °C) ±0.25% ±0.25%
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. Typical (25 °C, ±5 °C) ±0.26% ±0.43%
Maximum (-40 °C to 70 °C) ±0.67% ±1.06%
Stability

Gain drift

±34 ppm/°C

Offset drift

±580 μV/°C

Input bandwidth (-3 dB)

950 kHz min

Input impedance

Resistance

1 MΩ

Capacitance

5 pF

Input noise, code-centered

RMS

0.7 LSBrms

Peak-to-peak

5 LSB

No missing codes

12 bits

DNL

-0.9 to 1.5 LSB

INL

±1.5 LSB

Crosstalk, at 10 kHz

-75 dB

Settling time, to 1 LSB

1.25 μs

MTBF

1,092,512 hours at 25 °C; Bellcore Issue 2, Method 1, Case 3, Limited Part Stress Method

Power Requirements

Power consumption from chassis

Active mode

1 W maximum

Sleep mode

1 mW maximum

Thermal dissipation (at 70 °C)

Active mode

1 W maximum

Sleep mode

32 mW maximum

Physical Characteristics

Screw-terminal wiring

Gauge

0.2 mm2 to 2.5 mm2 (26 AWG to 14 AWG) copper conductor wire

Wire strip length

13 mm (0.51 in.) of insulation stripped from the end

Temperature rating

90 °C minimum

Torque for screw terminals

0.5 N · m to 0.6 N · m (4.4 lb · in. to 5.3 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 2.5 mm2

Connector securement

Securement type

Screw flanges provided

Torque for screw flanges

0.2 N · m (1.80 lb · in.)

Weight

NI-9221 with screw terminal

165 g (5.8 oz)

NI-9221 with spring terminal

152 g (5.4 oz)

NI-9221 with DSUB

142 g (5.0 oz)

Dimensions

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

NI-9221 with Screw Terminal and NI-9221 with Spring Terminal Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM

±60 V DC maximum

Channel-to-channel

None

Channel-to-earth ground

Continuous

250 V RMS, Measurement Category II

Withstand

2,300 V RMS, verified by a 5 s dielectric withstand test

Measurement Category II

Caution Do not connect the product to signals or use for measurements within Measurement Categories III or IV.
Attention Ne pas connecter le produit à des signaux dans les catégories de mesure III ou IV et ne pas l'utiliser pour effectuer des mesures dans ces catégories.

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.

NI-9221 with DSUB Safety Voltages

Connect only voltages that are within the following limits.

Channel-to-COM

±60 V DC maximum

Channel-to-channel

None

Channel-to-earth

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

2,000 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-9221 at ni.com/calibration.

Calibration interval

1 year

1 Range equals 62.50 V

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.