NI-9470 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.

NI-9470 Pinout



Table 3. Signal Descriptions
Signal Description
COM Common reference connection for the power supply
DO- Digital output return (negative) connection
DO+ Digital output source (positive) connection
Vsup DC voltage power supply connection

Output Characteristics

Number of output channels

8 push-pull

Current-sensing inputs

8 low-side sensing resistors

Data rate

12.8 MHz timebase

3.2 kHz

3.125 kHz

2.56 kHz

2 kHz

13.1072 MHz timebase

3.277 kHz

3.2 kHz

2.621 kHz

2.048 kHz

PWM frequency configuration

Per channel

PWM frequency

DataRate1
to
DataRate511

PWM frequency, maximum

2.048 kHz

PWM frequency accuracy

0.01%

Duty cycle range

0% to 100%

Pulse distortion

430 ns maximum

Table 2. Maximum Current Per Channel
Number of Channels Maximum Current Per Channel
Two channels 3 A
Four channels 2.3 A
All channels 1.6 A
Note Maximum current is the average output current for inductive loads and is the RMS current for resistive loads. The RMS current for a resistive load is given by the peak current times the square root of the duty cycle.

Maximum peak current per channel

3.5 A

Maximum cable length

External power supply cable maximum length

10 m

Digital output cable maximum length

20 m

Current Readback

Sample rate

Once every PWM cycle

ADC type

Oversampled SAR

Readback resolution

16 bits

Nominal input range

-0.35 A to 3.5 A

Table 3. Accuracy
Measurement Conditions Percent of Reading (Gain Error) Percent of Range[1]1 Range = 3.5 A. (Offset Error)
Maximum (-40 °C to 70 °C) 1.36% 0.571%
Typical (-40 °C to 70 °C) 0.652% 0.174%
Stability

Gain drift

74 ppm/°C

Offset drift

51 µC/°C

Integral non-linearity

0.073%

Noise

200 µA RMS

Voltage Readback

Sample rate

DataRate10

ADC type

Sigma-Delta

Readback resolution

11 bits

Nominal input range

0 V to 40 V

Gain accuracy

1.2%

Offset accuracy

200 mV

Noise

10 mV RMS

Temperature Readback

Sample rate

DataRate10

ADC type

Sigma-Delta

Readback resolution

12 bits

Nominal measurement input range

-40 °C to 125 °C

Output Mode Characteristics

Setpoint mode

Per channel

Duty Cycle mode

Duty cycle setpoint

0% to 100%

Duty cycle setpoint resolution

0.025% maximum

Average Current mode

Current setpoint

0 A to 3.5 A

Current setpoint resolution

12 bits

PID coefficients

0%A
to
16,383.999%A

PID coefficient resolution

0.001%A

Dither

Dither control

Per channel

Waveform

Triangle

Dither frequency

PWMFrequency4
to
PWMFrequency4,095

Maximum dither period error[2]2 NI recommends selecting a dither divisor that is a multiple of four to generate an optimal dither triangle wave with zero period error. Other values for the dither divisor will be rounded up to the next multiple of four in generating the dither waveform to ensure there is an even number of points in each quarter section of the triangle waveform. The dither triangle wave slope will differ from an ideal triangle wave, especially at small dither divisor values that are not multiples of four.

4 PWM cycles

Open-loop mode

Peak amplitude

0% to 100%

Amplitude resolution

12-bit

Closed-loop mode

Peak amplitude

0 A to 3.5 A

Amplitude resolution

12-bit

Diagnostics and Protection

Error flags (per channel)

Voltage out-of-range flag

Vsup < 4.2 V or Vsup > 34 V

Overcurrent flag

Isup > 8.5 A (4.3 A minimum, 14 A maximum)

Note Isup is the current sourced from the supply on Vsup to the load on DO+.
PWM shut down conditions

Shut down behavior

Drive output low (DO+ = COM)

Overvoltage

Vsup > 35 V

Undervoltage

Vsup < 4 V

Overcurrent

Isup > 8.5 A (4.3 A minimum, 14 A maximum)

Overcurrent response time

2.5 µs

Overtemperature protection

Per module

PWM output tristate conditions

Power up, power down, master timebase loss

Reverse polarity protection (Vsup-to-COM)

-30 V

I/O Wiring

I/O plug type

Molex Ultra-Fit, part number 1722583116

Crimp terminal

18 AWG to 16 AWG

Molex Ultra-Fit, part number 1722536012

22 AWG to 20 AWG

Molex Ultra-Fit, part number 1722536112

Wire gauge

22 AWG to 16 AWG

Note NI recommends using 2x Molex Ultra-Fit terminal position assurance retainers (Molex part number 1722644008) with each connector to prevent terminal back-out.

Safety Voltages

Connect only voltages that are below these limits.

Vsup-to-COM

0 V DC to 30 V DC maximum, Measurement Category I

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.

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 consumption from chassis

Active mode

571 mW

Sleep mode

1 mW

Thermal dissipation (at 70 °C)

Active mode

1.5 W

Sleep mode

200 mW

Current per channel

Two channels active

3 A

Four channels active

2.3 A

Eight channels active

1.6 A

Vsup

5 V to 30 V

External power supply

5 V to 30 V

Physical Characteristics

Tip For two-dimensional drawings and three-dimensional models of the NI-9470 and connectors, visit ni.com/dimensions.

Dimensional Drawings

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

Dimensions

Length

76 mm (3 in.)

Width

23 mm (0.9 in.)

Height

88 mm (3.5 in.)

Weight

140 g (4.9 oz)

Calibration

You can obtain the calibration certificate and information about calibration services for the NI-9470 at ni.com/calibration.

Calibration interval

2 years

1 Range = 3.5 A.

2 NI recommends selecting a dither divisor that is a multiple of four to generate an optimal dither triangle wave with zero period error. Other values for the dither divisor will be rounded up to the next multiple of four in generating the dither waveform to ensure there is an even number of points in each quarter section of the triangle waveform. The dither triangle wave slope will differ from an ideal triangle wave, especially at small dither divisor values that are not multiples of four.