NI-9775 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-9775 Pinout



Table 1. Signal Descriptions
Signal Description
AI Analog input signal connection
CHASSIS GND Chassis ground connection

Input Characteristics

Number of channels

4 (simultaneously sampled)

Input type

Referenced single-ended

Input impedance

1 MΩ

Input capacitance

24 pF

Input coupling

DC

Input range

±10 V, nominal

±11.3 V, typical

±10.04 V, minimum

ADC resolution

14 bits

Overvoltage protection

±30 V DC, safe operating area

Figure 1. Safe Operating Area


Table 2. DC Accuracy
Measurement Conditions Percent of Reading (Gain Error) Percent of Range[1]1 Range equals 10 V for absolute accuracy calcuations. (Offset Error)
Calibrated Maximum (-40 °C to 70 °C) ±1.7% ±0.49%
Typical (25 °C, ±5 °C) ±0.32% ±0.08%
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. Maximum (-40 °C to 70 °C) ±4.0% ±4.0%
Typical (25 °C, ±5 °C) ±1.7% ±1.8%

DC gain drift

±140 ppm/°C

DC offset drift

±0.34 mV/°C

AC amplitude accuracy

±0.25 dB at 50 kHz

AC amplitude drift

±172 ppm/°C

Channel-to-channel crosstalk

< -90 dB at 5 MHz

Timing modes (software-selectable)

High-speed

High-resolution

Analog filter (software-selectable)

6th order low-pass Bessel

Analog filter -3 dB bandwidth

High-speed mode with analog filter disabled

13.9 MHz

High-speed mode with analog filter enabled

4.7 MHz

High-resolution mode

2.36 MHz

Alias rejection in high-resolution mode

45 dB at 5 MS/s only

Figure 1. Frequency Response in High-Speed Mode with Analog Filter Disabled


Figure 1. Frequency Response in High-Speed Mode with Analog Filter Enabled


Figure 1. Frequency Response in High-Resolution Mode


Figure 1. Idle Channel FFT in High-Speed Mode with Analog Filter Disabled (20 MS/s, 32,768 point FFT)


Figure 1. Idle Channel FFT in High-Resolution Mode (1 MS/s, 32,768 point FFT)


Figure 1. Step Response


Figure 1. Single-Tone Spectrum at (-1 dB FS, 2.45 MHz)


Spurious free dynamic range (-60 dB FS input)

High-speed mode at 2.45 MHz

89 dB FS

High-resolution mode at 100 kHz

94 dB FS

Input to trigger delay

High-speed mode with analog filter disabled

863 ns

High-speed mode with analog filter enabled

950 ns

High-resolution mode

4.62 μs

Input delay (Continuous Mode)

High-speed mode with analog filter disabled

913 ns

High-speed mode with analog filter enabled

999 ns

High-resolution mode

4.67 µs

Noise

High-speed mode

2.8 mV RMS

High-resolution mode

1.4 mV RMS

Effective number of bits

High-speed mode

11 bits

High-resolution mode

12 bits

Signal-to-Noise ratio

High-speed mode

68 dB at 2.45 MHz

High-resolution mode

74 dB at 100 kHz

Total harmonic distortion at -1 dB FS input

High-speed mode with analog filter disabled at 2.45 MHz

-62 dB FS

High-speed mode with analog filter enabled at 1 MHz

-69 dB FS

High-resolution mode at 100 kHz and

-75 dB FS

Channel-to-channel skew

Analog filter disabled

1.5 ns

Analog filter enabled

12.7 ns

LSB weight

1.385 mV/LSB

Horizontal

Sample clock source

20 MHz PLL

Maximum sample rate in record mode

High-speed mode

20 MS/s

High-resolution mode

5 MS/s

Figure 1. Phase Noise


Timebase frequency

20 MHz

Timebase accuracy

±50 ppm

PLL reference clock source

Internal master timebase

12.8 MHz

Chassis OCLK

12.8 MHz

Data Rate in Record Mode

20⁢ MS/sN
Where
  • N ∈ {1, 2, 3, 4, 5, ..., 65,535} for high-speed mode
  • N ∈ {4, 8, 12, 16, 20, ..., 65,532} for high-resolution mode

Data Rate in Continuous Mode

20⁢ ⁢MS/sM

Where

  • M ∈ {5, 6, 7, 8, 9, ..., 65,535} with one channel enabled for high-speed mode
  • M ∈ {8, 12, 16, 20, 24, ..., 65,532} with one channel enabled for high-resolution mode
  • M ∈ {10, 11, 12, 13, 14, ..., 65,535} with two channels enabled for high-speed mode
  • M ∈ {12, 16, 20, 24, 28, ..., 65,532} with two channels enabled for high-resolution mode
  • M ∈ {15, 16, 17, 18, 19, ..., 65,535} with three channels enabled for high-speed mode
  • M ∈ {16, 20, 24, 28, 32, ..., 65,532} with three channels enabled for high-resolution mode
  • M ∈ {20, 21, 22, 23, 24, ..., 65,535} with four channels enabled for high-speed mode
  • M ∈ {20, 24, 28, 32, 36, ..., 65,532} with four channels enabled for high-resolution mode

Trigger

Supported trigger modes

Start

Reference

Trigger types

Analog edge

Digital edge

Software

Trigger sources

AI0 to AI3

Chassis backplane

Dead time

0 samples

Analog Edge Trigger

Trigger sources

AI0 to AI3

Settings

Level

Slope

Hysteresis

Trigger uncertainty

≤ 1 sample

Rearm time

1 sample minimum

Waveform Specifications

Onboard memory size

128 Mibits

Minimum record length

16 samples

Minimum number of pre-trigger samples

CompactRIO

1

CompactDAQ

2

Minimum number of post-trigger samples

CompactRIO

1

CompactDAQ

2

Maximum number of records

32 records

Maximum number of samples per record

CompactDAQ

2⁢ ×[(222Number⁢ of⁢records)−1⁢]Number⁢ ⁢of⁢channels

CompactRIO

2⁢ ×[(222Number⁢ of⁢records)−1⁢]Number⁢ ⁢of⁢channels−8×Number of channels

Record data transfer rate

4.7 MS/s, maximum[3]3 With all four channels enabled.

4 MS/s, typical

Safety Voltages

Connect only voltages that are within Measurement Category O.

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.

Power Requirements

Power consumed from chassis

Active mode

0.9 W maximum

Sleep mode

52.5 μW maximum

Thermal dissipation (at 70 °C)

Active mode

1.06 W maximum

Sleep mode

3.65 mW maximum

Physical Characteristics

Dimensions

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

Weight

172 g

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9775 at ni.com/calibration.

Calibration interval

1 year

1 Range equals 10 V for absolute accuracy calcuations.

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.

3 With all four channels enabled.