NI-9208 Specifications

These specifications apply to the NI-9208.

Revision History

Version	Date changed	Description
378890B-01	February 2025	Updated accuracy table.
378890A-01	December 2022	Initial release.

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Connector Types

The NI-9208 has more than one connector type: NI-9208 with spring terminal and NI-9208 with DSUB. Unless the connector type is specified, NI-9208 refers to both connector types.

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-9208 with Spring Terminal Pinout

Table 2. Signal Descriptions
Signal	Description
AI	Analog input signal connection
COM	Common reference connection to isolated ground
V_sup	Voltage supply connection

NI-9208 with DSUB Terminal Pinout

Table 3. Signal Descriptions
Signal	Description
AI	Analog input signal connection
COM	Common reference connection to isolated ground
V_sup	Voltage supply connection

Input Characteristics


Number of channels	16 analog input channels
ADC resolution	24 bits
Type of ADC	Delta-Sigma
Sampling mode	Scanned

Table 4. Input Range
Minimum	±21.5 mA
Typical	±22 mA

Table 5. Conversion Time (Per Channel)
High-resolution mode	52 ms
High-speed mode	2 ms


Overvoltage protection, channel-to-COM	±30 V maximum on one channel at a time

Table 6. Vsup Pins
Current	2 A maximum
Voltage	30 V maximum


Input impedance	85 Ω

Table 7. Accuracy
Calibrated Measurement Conditions	Within 2 Years of Calibration		Within 10 Years of Calibration
Calibrated Measurement Conditions	Percent of Reading (Gain Error)	Percent of Range (Offset Error)	Percent of Reading (Gain Error)	Percent of Range (Offset Error)
Maximum (-40 °C to 70 °C)	±0.76%	±0.04%	0.86%	0.04%

Note For the table above, Range = 22 mA

Note NI recommends a calibration interval of 2 years and only provides calibration services referencing the 2-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 2-year specification limits.

Table 8. Input Noise
High-resolution mode	50 nA RMS
High-speed mode	200 nA RMS

Table 9. Stability
Gain drift	20 ppm/°C
Offset drift	62 nA/°C

Table 10. NMRR (High-Resolution Mode Only)
50 Hz	66 dB
60 Hz	68 dB

NI-9208 with Spring Terminal Safety Voltages

Connect only voltages that are within the following limits:

Isolation

Channel-to-channel

None

Channel-to-earth ground
Continuous	250 V RMS, Measurement Category II
Withstand, up to 4,000 m	3,000 V RMS, verified by a 5 s dielectric withstand test

NI-9208 with DSUB 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, up to 2,000 m	1,000 V RMS, verified by a 5 s dielectric withstand test

Measurement Category

Measurement Category I

Caution Do not connect the NI-9208 with DSUB to signals or use for measurements within Measurement Categories II, III, or IV.

Attention Ne pas connecter le NI-9208 with DSUB à des signaux dans les catégories de mesure II, III ou IV et ne pas l'utiliser pour effectuer des mesures dans ces catégories.

Warning Do not connect the NI-9208 with DSUB 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 NI-9208 with DSUB 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 NI-9208 with DSUB 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.

Measurement Category II

Caution Do not connect the NI-9208 with spring terminal to signals or use for measurements within Measurement Categories III or IV.

Attention Ne pas connecter le NI-9208 with spring terminal 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.

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
NI-9208 with spring terminal	4,000 m
NI-9208 with DSUB	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.

Power Requirements

Power consumption from chassis
Active mode	282 mW maximum
Sleep mode	25 μW maximum

Thermal dissipation (at 70 °C)
Active mode	1.29 W maximum
Sleep mode	0.72 W maximum

Physical Characteristics

Weight
NI-9208 with spring terminal	161 g (5.7 oz)
NI-9208 with DSUB	144 g (5.1 oz)

Dimensions

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

NI-9208 with Spring Terminal

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	0.14 mm² to 1.5 mm²

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-9208 at ni.com/calibration.


Recommended calibration interval	2 years