NI-9253 Specifications

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Updated2024-11-01
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NI-9253 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-9253 Pinout

Table 1. Signal Descriptions
Signal	Description
AI	Analog input signal connection
V_sup	Voltage supply connection
COM	Common reference connection to isolated ground
NC	No connection

NI-9253 Safety Voltages

Connect only voltages that are within the following limits:

AI-to-COM and V_sup-to-COM

±30 V DC maximum

Channel-to-channel isolation

None

Channel-to-earth ground isolation^[1]¹ Channels include V_sup and COM.
Continuous	250 V RMS, Measurement Category II
Withstand	3,000 V RMS, verified by a 5 s dielectric withstand test

Overvoltage protection

±30 V, between any two pins of the connector^[2]² Only 1 channel at a time.

Caution Do not connect the NI-9253 to signals or use for measurements within Measurement Categories III or IV.

Attention Ne connectez pas le NI-9253 à des signaux et ne l'utilisez pas pour effectuer des mesures dans les catégories de mesure III ou IV.

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

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

Power Requirements

Power consumption from chassis
Active mode	798 mW maximum
Sleep mode	48 μW maximum

Thermal dissipation (at 70 °C)
Active mode	1.5 W maximum
Sleep mode	751 mW maximum

Physical Characteristics

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.)

Weight

158 g (5.6 oz)

Input Characteristics

Number of channels

8 analog input channels

ADC resolution

24 bits

Type of ADC

Delta-Sigma with analog prefiltering

Sampling mode

Simultaneous

Internal master timebase (f_M)
Frequency	12.8 MHz
Accuracy	±50 ppm maximum

CompactRIO & CompactDAQ chassis data rate range (f_s)

Using internal master timebase
Minimum	10 S/s
Maximum	50 kS/s

Using external master timebase
Minimum	0.78 S/s
Maximum	51.367 kS/s

R Series Expansion chassis data rate range (f_s)

Using internal master timebase
Minimum	10 S/s
Maximum	25 kS/s

Data rate

f_{s} = \frac{f_{M}}{128 \times a}

Overvoltage protection^[3]³ Only 1 channel at a time.

±30 V

Input resistance (AIx to COM)

79 Ω

Input current range
Minimum	±21.6 mA
Typical	±21.9 mA

Scaling coefficients

2615 pA/LSB

Butterworth filter
Filter order	2nd or 4th order
Cut-off frequencies^[4]⁴ Refer to Table 1 for the values of f_c and f_M.	$\frac{f_{c} {\times f}_{M}}{12.8 M H z}$
Flatness^[5]⁵ Refer to Table 1 for the values of f_F and f_M.	$\frac{f_{F} {\times f}_{M}}{12.8 M H z}$
Input delay^[6]⁶ Refer to Table 2 for the values of t_D and f_M.	$(t_{D} - 2.31 μ s) \times (\frac{12.8 M H z}{f_{M}}) + 2.31 μ s$
Input delay tolerance	±200 ns

Table 2. Butterworth Filter Cut-off Frequencies and Flatness
Master Timebase Clock (f_M)	Cut-off Frequencies (f_c)	2nd Order		4th Order
Master Timebase Clock (f_M)	Cut-off Frequencies (f_c)	0.1% Flatness (f_F) at 0.0087 dB	1% Flatness (f_F) at 0.087 dB	0.1% Flatness (f_F) at 0.0087 dB	1% Flatness (f_F) at 0.087 dB
12.8 MHz	4000 Hz	740 Hz	1445 Hz	1125 Hz	2295 Hz
	2000 Hz	415 Hz	750 Hz	875 Hz	1210 Hz
	1000 Hz	215 Hz	380 Hz	430 Hz	615 Hz
	500 Hz	105 Hz	190 Hz	225 Hz	305 Hz
	250 Hz	55 Hz	95 Hz	115 Hz	155 Hz
	125 Hz	25 Hz	45 Hz	60 Hz	75 Hz

Note The specifications in Table 1 scale linearly with the master timebase frequency as indicated by the formulas shown in the Butterworth filter section. For example, on a 2nd Order Butterworth filter, for a master timebase clock of 13.1072 MHz, the cut-off frequency is 4096 Hz and 757.7 Hz of 0.1% Flatness instead of the cut-off frequency of 4000 Hz and 740 Hz of 0.1% Flatness at the 12.8 MHz default internal master timebase clock.

Table 3. Butterworth Filter Input Delay
Master Timebase Clock (f_M)	Cut-off Frequencies (f_c)	2nd Order		4th Order
Master Timebase Clock (f_M)	Cut-off Frequencies (f_c)	DC Delay (t_D)	Maximum Delay (t_D)	DC Delay (t_D)	Maximum Delay (t_D)
12.8 MHz	4000 Hz	98.1 µs	104.7 µs	136.2 µs	158.1 µs
	2000 Hz	153.7 µs	167.0 µs	238.8 µs	282.7 µs
	1000 Hz	266.3 µs	293.0 µs	449.2 µs	538.9 µs
	500 Hz	491.3 µs	544.5 µs	861.6 µs	1038.1 µs
	250 Hz	941.4 µs	1047.8 µs	1700.3 µs	2059.8 µs
	125 Hz	1841.6 µs	2054.3 µs	3347.0 µs	4055.5 µs

Note The specifications in Table 2 scale with the master timebase frequency as indicated by the formulas shown in the Butterworth filter section. For example, a master timebase clock of 13.1072 MHz, the 2nd order Butterworth filter with a 4096 Hz cut-off will have a 98.855 µs input DC delay.

Figure 1. Butterworth Filter Input Delay (4th Order, with 12.8 MHz Timebase, 4000 Hz, 2000 Hz, 1000 Hz)

Figure 1. Butterworth Filter Input Delay (4th Order, with 12.8 MHz Timebase, 500 Hz, 250 Hz, 125 Hz)

Figure 1. Butterworth Filter Input Delay (2nd Order, with 12.8 MHz Timebase, 4000 Hz, 2000 Hz, 1000 Hz)

Figure 1. Butterworth Filter Input Delay (2nd Order, with 12.8 MHz Timebase, 500 Hz, 250 Hz, 125 Hz)

Comb filter

Programmable first notch

f_s, f_s/2, f_s/4, f_s/8, f_s/16

Input delay with comb filter ^[7] ⁷ Refer to the Table 3 table for the values of A and B.

\frac{(A + B)}{f_{s}} + 2.31 μ s

Settling time with comb filter ^[7]

\frac{2 (A + B)}{f_{s}} + 2.31 μ s

Table 4. Input Delay with Comb Filter
Variable	Value
A	2.4 for f_s = 50000
	1.8 for f_s = 14285.71 to 33333.33
	1 for f_s = 2777.78 to 12500
	0.6 for f_s = all other output data rates
B	0 for filter first notch at f_s
	0.5 for filter first notch at f_s/2
	1.5 for filter first notch at f_s/4
	3.5 for filter first notch at f_s/8
	7.5 for filter first notch at f_s/16

Table 5. DC Accuracy
Measurement Conditions	Percent of Reading (Gain Error)	Percent of Range^[8]⁸ Range equals 21.9 mA (Offset Error)
Maximum (-40 °C to 70 °C)	±0.41%	±0.08%
Typical (23 °C, ±5 °C)	±0.14%	±0.02%

Non-linearity

12 ppm

Stability of Accuracy
Gain drift	12 ppm/°C
Offset drift	81 nA/°C

Passband, -3 dB

Refer to the -3 dB graphs in the Filtering section

Delay linearity (f_in ≤ 24.9 kHz)

11.16 ns maximum

Channel-to-channel mismatch (f_in ≤ 24.9 kHz)
Gain	±0.116 dB maximum
Delay	166.67 ns/kHz maximum

Module-to-module mismatch (f_in ≤ 24.9 kHz)

Delay

166.67 n s / k H z + \frac{1}{f_{M}}

Attenuation @ 2 x oversample rate (23° C)

104 dB

Idle Channel Noise

Comb filter with first notch at f_s
f_s = 50 kS/s	130 nA
f_s = 10 kS/s	64 nA
f_s ≤ 1 kS/s	39 nA

Butterworth filter, f_s = 50 kS/s
f_c = 4 kHz	68 nA
f_c = 1 kHz	42 nA
f_c = 125 Hz	30 nA

Note The noise specifications assume the NI-9253 is using the internal master timebase frequency of 12.8 MHz.

Crosstalk (CH to CH)
f _in < 100 Hz	100 dB
f _in < 15 kHz	90 dB

Normal mode rejection ratio (NMRR) using internal or external master timebase of 12.8 MHz^[9]⁹ Only applicable for comb filter.
60 S/s, f_in = 60 Hz ± 1 Hz	35 dB minimum
50 S/s, f_in = 50 Hz ± 1 Hz	33 dB minimum
10 S/s, f_in = 50 Hz/60 Hz ± 1 Hz	35 dB minimum

Normal mode rejection ratio (NMRR) using external master timebase of 13.1072 MHz^[9]
60 S/s, f_in = 60 Hz ± 1 Hz	34 dB minimum
50 S/s, f_in = 50 Hz ± 1 Hz	33 dB minimum
10 S/s, f_in = 50 Hz/60 Hz ± 1 Hz	35 dB minimum

Common mode sensitivity to earth ground
f _in ≤ 60 Hz	0.1 nA/V_peak^[10]¹⁰ This value is how much the module readings change when common mode voltage is applied between the channels and earth ground.

Field side power detection threshold
Minimum	7.2 V^[11]¹¹ Field side power will never be detected if it is below this value.
Maximum	8.1 V^[12]¹² Field side power will always be detected if it is above this value.

Input Limit Programming Resolution

30.5176 µA

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9253 at ni.com/calibration.

Calibration interval

2 years

¹ Channels include V_sup and COM.

² Only 1 channel at a time.

³ Only 1 channel at a time.

⁴ Refer to Table 1 for the values of f_c and f_M.

⁵ Refer to Table 1 for the values of f_F and f_M.

⁶ Refer to Table 2 for the values of t_D and f_M.

⁷ Refer to the Table 3 table for the values of A and B.

⁸ Range equals 21.9 mA

⁹ Only applicable for comb filter.

¹⁰ This value is how much the module readings change when common mode voltage is applied between the channels and earth ground.

¹¹ Field side power will never be detected if it is below this value.

¹² Field side power will always be detected if it is above this value.

In This Section

Definitions
Conditions
NI-9253 Pinout
NI-9253 Safety Voltages
Environmental Characteristics
- Shock and Vibration
Power Requirements
Physical Characteristics
Input Characteristics
Calibration

Related Information

Software Support for CompactRIO, CompactDAQ, Single-Board RIO, R Series, and EtherCAT

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