USB-6451 and USB-6451 (OEM) Specifications
- Updated2025-02-07
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USB-6451 and USB-6451 (OEM) Specifications
USB-6451 and USB-6451 (OEM) Specifications
These specifications apply to the USB-6451 (Revision D, Revision F, and subsequent revisions) and USB-6451 (OEM). Unless Revision D or the OEM version is specified, USB-6451 refers to both versions.
Revision History
Version | Date changed | Description |
---|---|---|
379043E-01 | February 2025 | Added 1.8 V, 2.5 V, and 3.3 V logic families and analog triggers. |
379043D-01 | January 2025 | Differentiated between Revision F and earlier revisions. |
379043C-01 | November 2024 | Added USB-6451 (OEM). |
379043B-01 | October 2024 | Updated for the NI mioDAQ 24C3 release. |
379043A-01 | September 2024 | Initial release. |
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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 at 25 °C unless otherwise noted.
USB-6451 AI Connector Pinout
Use the pinout to connect to analog input terminals on the USB-6451.
Pin | Signal |
---|---|
1 | AI 8 |
2 | AI 9 |
3 | AI 10 |
4 | AI 11 |
5 | AI 12 |
6 | AI 13 |
7 | AI 14 |
8 | AI 15 |
9 | AI GND |
10 | No connect |
11 | No connect |
12 | No connect |
13 | No connect |
14 | No connect |
15 | No connect |
16 | No connect |
17 | No connect |
18 | CHSGND |
19 | AI 0 |
20 | AI 1 |
21 | AI 2 |
22 | AI 3 |
23 | AI 4 |
24 | AI 5 |
25 | AI 6 |
26 | AI 7 |
27 | NR (AI SENSE) |
28 | No connect |
29 | No connect |
30 | No connect |
31 | No connect |
32 | No connect |
33 | No connect |
34 | No connect |
35 | No connect |
36 | ID 0 |
Signal | Function | Reference | Direction | Description |
---|---|---|---|---|
AI <0..7> | Analog input channels | Varies | Input |
Supports differential or single-ended measurement modes. The default configuration is differential mode. In differential mode, these channels are the positive input for the differential pair. The negative input of the differential pair is located directly beneath the positive input. In single-ended mode, each signal is a separate analog input voltage channel. The ground reference in single-ended mode is configurable. In referenced single-ended (RSE) mode, AI GND is the reference for the voltage measurement. In non-referenced single-ended (NRSE) mode, the NR pin is the reference. Note You can configure the input mode
per channel.
|
AI <8..15> | Analog input channels | Varies | Input |
Supports single-ended measurements only. The default configuration is RSE mode. In RSE mode, AI GND is the reference for the voltage measurement. In NRSE mode, the NR pin is the reference. For differential measurements, refer to the descriptions for AI <0..7>. |
AI GND | Analog input ground | — | — | The reference point for single-ended measurements in RSE mode and the bias
current return point for differential measurements. AI GND, AO GND, D GND, and CHSGND are all connected internally. |
NR (AI SENSE) | AI SENSE for NRSE mode | — | Input | The AI SENSE pin is labeled "NR" because it is used when the input terminal is configured to NRSE mode. In NRSE mode, AI SENSE acts as a remote sense of a reference voltage that can be at a different voltage potential than AI GND. |
CHSGND | Chassis ground | — | — | Connects directly to the chassis ground of the USB-6451 enclosure. It can be used as a termination point for shielded cables to help improve measurement quality. |
ID 0 | — | — | — | This feature is not supported yet. |
USB-6451 AO/DIO Connector Pinout
Use the pinout to connect to analog output and digital input/output terminals on the USB-6451.
Pin | Signal |
---|---|
1 | CHSGND |
2 | AO GND |
3 | AO GND |
4 | AO GND |
5 | AO GND |
6 | D GND |
7 | D GND |
8 | PFI 8/P0.8 (port0/line8) |
9 | PFI 9/P0.9 (port0/line9) |
10 | D GND |
11 | PFI 10/P0.10 (port0/line10) |
12 | PFI 11/P0.11 (port0/line11) |
13 | D GND |
14 | PFI 12/P0.12 (port0/line12) |
15 | PFI 13/P0.13 (port0/line13) |
16 | D GND |
17 | PFI 14/P0.14 (port0/line14) |
18 | PFI 15/P0.15 (port0/line15) |
19 | ID 1 |
20 | AO 0 |
21 | AO 1 |
22 | No connect |
23 | No connect |
24 | +5 V |
25 | PFI 0/P0.0 (port0/line0) |
26 | PFI 1/P0.1 (port0/line1) |
27 | D GND |
28 | PFI 2/P0.2 (port0/line2) |
29 | PFI 3/P0.3 (port0/line3) |
30 | D GND |
31 | PFI 4/P0.4 (port0/line4) |
32 | PFI 5/P0.5 (port0/line5) |
33 | D GND |
34 | PFI 6/P0.6 (port0/line6) |
35 | PFI 7/P0.7 (port0/line7) |
36 | D GND |
Signal | Function | Reference | Direction | Description |
---|---|---|---|---|
AO <0..1> | Analog output channels | AO GND | Output | Supplies the voltage output of the AO channels. |
AO GND | Analog output ground | — | — | AO GND is the reference for the AO channels. AI GND, AO GND, D GND, and CHSGND are all connected internally. |
+5 V | +5 V power source | D GND | Output | Provides current limited +5 V power output that can be used to power external circuitry. Refer to the +5 V Power Source section for more information. Leave this pin open if you do not use it. |
PFI <0..15>/P0.<0..15> | Port 0 digital I/O channels | D GND | Input or output |
Digital channels that can be individually configured as input or output. These channels are referred to as port0/line0:15 in software when used as digital I/O. They are referred to as PFI 0:15 when used for other purposes, like timing I/O. Can also be individually configured for the following uses.
|
D GND | Digital ground | — | — | Supplies the reference for the P0.<0..15> pins and +5 V pin.
AI GND, AO GND, D GND, and CHSGND are all connected internally. |
CHSGND | Chassis ground | — | — | Connects directly to the chassis ground of the USB-6451 enclosure. It can be used as a termination point for shielded cables to help improve measurement quality. |
ID 1 | — | — | — | This feature is not supported yet. |
USB-6451 (OEM) AI Connector Pinout
Use the pinout to connect to analog input terminals on the USB-6451 (OEM).
Pin | Signal |
---|---|
1 | AI 8 |
2 | AI 0 |
3 | AI 9 |
4 | AI 1 |
5 | AI GND |
6 | AI GND |
7 | AI 10 |
8 | AI 2 |
9 | AI 11 |
10 | AI 3 |
11 | AI GND |
12 | AI GND |
13 | AI 12 |
14 | AI 4 |
15 | AI 13 |
16 | AI 5 |
17 | AI GND |
18 | AI GND |
19 | AI 14 |
20 | AI 6 |
21 | AI 15 |
22 | AI 7 |
23 | AI GND |
24 | NR (AI SENSE) |
25 | AI GND |
26 | NR (AI SENSE) |
27 | No connect |
28 | No connect |
29 | No connect |
30 | No connect |
31 | AI GND |
32 | AI GND |
33 | No connect |
34 | No connect |
35 | No connect |
36 | No connect |
37 | AI GND |
38 | AI GND |
39 | No connect |
40 | No connect |
41 | No connect |
42 | No connect |
43 | AI GND |
44 | AI GND |
45 | No connect |
46 | No connect |
47 | No connect |
48 | No connect |
49 | CHSGND |
50 | ID 0 |
Signal | Function | Reference | Direction | Description |
---|---|---|---|---|
AI <0..7> | Analog input channels | Varies | Input |
Supports differential or single-ended measurement modes. The default configuration is differential mode. In differential mode, these channels are the positive input for the differential pair. The negative input of the differential pair is located directly beneath the positive input. In single-ended mode, each signal is a separate analog input voltage channel. The ground reference in single-ended mode is configurable. In referenced single-ended (RSE) mode, AI GND is the reference for the voltage measurement. In non-referenced single-ended (NRSE) mode, the NR pin is the reference. Note You can configure the input
mode per channel.
|
AI <8..15> | Analog input channels | Varies | Input |
Supports single-ended measurements only. The default configuration is RSE mode. In RSE mode, AI GND is the reference for the voltage measurement. In NRSE mode, the NR pin is the reference. For differential measurements, refer to the descriptions for AI <0..7>. |
AI GND | Analog input ground | — | — | The reference point for single-ended measurements in RSE mode and the bias
current return point for differential measurements. AI GND, AO GND, D GND, and CHSGND are all connected internally. |
NR (AI SENSE) | AI SENSE for NRSE mode | — | Input | The AI SENSE pin is labeled "NR" because it is used when the input terminal is configured to NRSE mode. In NRSE mode, AI SENSE acts as a remote sense of a reference voltage that can be at a different voltage potential than AI GND. |
CHSGND | Chassis ground | — | — | Connects directly to the chassis ground lug of the USB-6451 (OEM). It can be used as a termination point for shielded cables to help improve measurement quality. |
ID 0 | — | — | — | This feature is not supported yet. |
USB-6451 (OEM) AO/DIO Connector Pinout
Use the pinout to connect to analog output and digital input/output terminals on the USB-6451 (OEM).
Pin | Signal |
---|---|
1 | CHSGND |
2 | ID 1 |
3 | AO GND |
4 | AO 0 |
5 | AO GND |
6 | AO 1 |
7 | AO GND |
8 | No connect |
9 | AO GND |
10 | No connect |
11 | D GND |
12 | +5 V |
13 | PFI 8/P0.8 (port0/line8) |
14 | PFI 0/P0.0 (port0/line0) |
15 | D GND |
16 | D GND |
17 | PFI 9/P0.9 (port0/line9) |
18 | PFI 1/P0.1 (port0/line1) |
19 | D GND |
20 | D GND |
21 | PFI 10/P0.10 (port0/line10) |
22 | PFI 2/P0.2 (port0/line2) |
23 | D GND |
24 | D GND |
25 | PFI 11/P0.11 (port0/line11) |
26 | PFI 3/P0.3 (port0/line3) |
27 | D GND |
28 | D GND |
29 | PFI 12/P0.12 (port0/line12) |
30 | PFI 4/P0.4 (port0/line4) |
31 | D GND |
32 | D GND |
33 | PFI 13/P0.13 (port0/line13) |
34 | PFI 5/P0.5 (port0/line5) |
35 | D GND |
36 | D GND |
37 | PFI 14/P0.14 (port0/line14) |
38 | PFI 6/P0.6 (port0/line6) |
39 | D GND |
40 | D GND |
41 | PFI 15/P0.15 (port0/line15) |
42 | PFI 7/P0.7 (port0/line7) |
43 | PWR_GR |
44 | PWR_RED |
45 | USER_GR |
46 | USER_RED |
47 | No connect |
48 | No connect |
49 | No connect |
50 | No connect |
Signal | Function | Reference | Direction | Description |
---|---|---|---|---|
AO <0..1> | Analog output channels | AO GND | Output | Supplies the voltage output of the AO channels. |
AO GND | Analog output ground | — | — | AO GND is the reference for the AO channels. AI GND, AO GND, D GND, and CHSGND are all connected internally. |
+5 V | +5 V power source | D GND | Output | Provides current limited +5 V power output that can be used to power external circuitry. Refer to the +5 V Power Source section for more information. Leave this pin open if you do not use it. |
PFI <0..15>/P0.<0..15> | Port 0 digital I/O channels | D GND | Input or output |
Digital channels that can be individually configured as input or output. These channels are referred to as port0/line0:15 in software when used as digital I/O. They are referred to as PFI 0:15 when used for other purposes, like timing I/O. Can also be individually configured for the following uses.
|
D GND | Digital ground | — | — | Supplies the reference for the P0.<0..15> pins and +5 V pin.
AI GND, AO GND, D GND, and CHSGND are all connected internally. |
CHSGND | Chassis ground | — | — | Connects directly to the chassis ground lug of the USB-6451 (OEM). It can be used as a termination point for shielded cables to help improve measurement quality. |
PWR_GR | USB PWR LED green color | DGND | Output |
Digital logic control signal that is high when the USB PWR LED is green or yellow. You can use this signal to drive an external LED. Leave this pin open if you do not use it. |
PWR_RED | USB PWR LED red color | DGND | Output |
Digital logic control signal that is high when the USB PWR LED is red or yellow. You can use this signal to drive an external LED. Leave this pin open if you do not use it. |
USER_GR | User LED green color | DGND | Output |
Digital logic control signal that is high when the USER LED is green or yellow. You can use this signal to drive an external LED. Leave this pin open if you do not use it. |
USER_RED | User LED red color | DGND | Output |
Digital logic control signal that is high when the USER LED is red or yellow. You can use this signal to drive an external LED. Leave this pin open if you do not use it. |
ID 1 | — | — | — | This feature is not supported yet. |
Analog Input
Number of channels | 16 single-ended or 8 differential |
Number of ADC | 8 |
Simultaneous sampling channels | Up to 8 channels |
ADC resolution | 20 bits |
DNL | No missing codes guaranteed |
INL | Refer to AI Absolute Accuracy |
|
Input coupling | DC |
Input range | ±0.2 V ±2.5 V ±5 V ±10 V |
Power on state | Differential Mode at 10 V Range |
Input Range | Product Version | Maximum Working Voltage for Analog Inputs (Signal + Common Mode) |
---|---|---|
±2.5 V, ±5 V, ±10 V | USB-6451 and USB-6451 (OEM) | ±10.5 V to AI GND |
±0.2 V | USB-6451 (Revision D) | ±3.5 V to AI GND |
USB-6451 (Revision F and subsequent revisions) and USB-6451 (OEM) | ±8.0 V to AI GND |
Device on | AI+ to AI GND | >10 GΩ in parallel with 35 pF |
AI- to AI GND | >10 GΩ in parallel with 35 pF | |
Device off | AI+ to AI GND | 1,290 Ω |
AI- to AI GND | 1,290 Ω |
Input bias current | ±10 pA typical ±2 nA maximum over full temperature range |
|
Input Range | Product Version | Small Signal Bandwidth (-3 dB) |
---|---|---|
±2.5 V, ±5 V, ±10 V | USB-6451 and USB-6451 (OEM) | 1.3 MHz |
±0.2 V | USB-6451 (Revision D) | 800 kHz |
USB-6451 (Revision F and subsequent revisions) and USB-6451 (OEM) | 360 kHz |
|
Input FIFO size | 8,191 samples shared among channels used |
Data transfers | USB Signal Stream, programmed I/O |
|
Input Range | Product Version | ±450 ppm | ±90 ppm | ±30 ppm | ±15 ppm | ±4 ppm |
---|---|---|---|---|---|---|
±2.5 V, ±5 V, ±10 V | USB-6451 and USB-6451 (OEM) | 1.0 µs | 2.7 µs | 6.2 µs | 11.0 µs | 40.0 µs |
±0.2 V | USB-6451 (Revision D) | 1.7 µs | 2.1 µs | 2.5 µs | 4.0 µs | 50.0 µs |
USB-6451 (Revision F and subsequent revisions) and USB-6451 (OEM) | 3.2 µs | 4.0 µs | 6.2 µs | 8.0 µs | 16.0 µs |
Input Level | Product Versions | Input Range | 1 kHz | 10 kHz | 100 kHz |
---|---|---|---|---|---|
-1 dBFS | USB-6451 and USB-6451 (OEM) | ±10 V | -102 dBc | -82 dBc | -62 dBc |
±5 V | -106 dBc | -88 dBc | -68 dBc | ||
± 2.5 V | -106 dBc | -99 dBc | -79 dBc | ||
USB-6451 (Revision D) | ±0.2 V | -105 dBc | -97 dBc | -68 dBc | |
USB-6451 (Revision F and subsequent revisions) and USB-6451 (OEM) | ±0.2 V | -105 dBc | -92 dBc | -55 dBc | |
-10 dBFS | USB-6451 and USB-6451 (OEM) | ±10 V | -106 dBc | -92 dBc | -72 dBc |
±5 V | -106 dBc | -103 dBc | -84 dBc | ||
± 2.5 V | -103 dBc | -103 dBc | -83 dBc |
Input Range | Idle Channel Noise (μV RMS) |
---|---|
±2.5 V, ±5 V, ±10 V | 88 |
±0.2 V | 23 |
Analog Triggers
Source | AI<0..15> |
Purpose | Reference trigger only |
Level | Full scale (depending on AI input range for the selected trigger channel) |
Resolution | 20-bit |
Accuracy | Same as AI Absolute Accuracy |
Modes | Rising-edge, rising-edge with hysteresis, falling-edge, falling-edge with hysteresis, entering window, leaving window |
AI Absolute Accuracy (Warranted)
Nominal Range, Positive Full Scale (V) | Nominal Range, Negative Full Scale (V) | 2 Years Residual Gain Error (ppm of Reading) | 10 Years Residual Gain Error (ppm of Reading) | Gain Tempco (ppm of Range/°C) | Residual Offset Error (ppm of Range) | Offset Tempco (ppm of Range/°C) | Full Scale Random Noise, σ (μV RMS) | 2 Years Absolute Accuracy at Full Scale (μV) | 10 Years Absolute Accuracy at Full Scale (μV) |
---|---|---|---|---|---|---|---|---|---|
10 | -10 | 81 | 133 | 2 | 6 | 0.3 | 197 | 1,299 | 1,819 |
5 | -5 | 86 | 138 | 2 | 9 | 0.6 | 138 | 692 | 952 |
2.5 | -2.5 | 114 | 166 | 2 | 18 | 1.2 | 134 | 442 | 572 |
0.2 | -0.2 | 152 | 204 | 16 | 96 | 9 | 24 | 63 | 74 |
- Temp Change From Last External Cal = 10 °C
- Temp Change From Last Internal Cal = 1 °C
- Number of readings = 10,000
- Coverage Factor = 3σ
Reference Tempco | 3 ppm/°C |
INL error | 10 ppm of range |
AI Absolute Accuracy Equation
For a coverage factor of 3 σ and averaging 10,000 points
AI Absolute Accuracy Example
For example, on the 10 V range for 2 years calibration interval, the absolute accuracy at full scale is as follows:
Analog Output
Number of channels | 2 |
DAC resolution | 16 bits |
DNL | ±1 LSB |
Monotonicity | 16 bits guaranteed |
|
Output range | ±10 V |
Output coupling | DC |
Output impedance[3]3 Output impedance excludes cabling impedance. | 0.05 Ω |
Output current drive | ±2 mA |
Overdrive protection during power on/off | ±30 V |
Overdrive current | 2.8 mA |
Power on state | Less than ±5 mV |
Output FIFO size | 16,383 samples shared among channels used |
Data transfers | USB Signal Stream, programmed I/O |
AO waveform modes | Non-periodic waveform Periodic waveform regeneration mode from onboard FIFO Periodic waveform regeneration from host buffer, including dynamic update |
Settling time, full-scale step, 15 ppm (1 LSB) | 25 µs with 50 pF load |
Slew rate | 8 V/µs |
|
Glitch energy mid-scale code transition | ±5 mV for 5 µs |
Crosstalk (at 10 kHz) | < -100 dB |
AO Absolute Accuracy (Warranted)
Absolute accuracy at full-scale numbers is valid immediately following internal calibration and assumes the device is operating within 10 °C of the last external calibration.
Nominal Range, Positive Full Scale (V) | Nominal Range, Negative Full Scale (V) | 2 Years Residual Gain Error (ppm of Reading) | 10 Years Residual Gain Error (ppm of Reading) | Gain Tempco (ppm of Range/°C) | Residual Offset Error (ppm of Range) | Offset Tempco (ppm of Range/°C) | 2 Years Absolute Accuracy at Full Scale (μV) | 10 Years Absolute Accuracy at Full Scale (μV) |
---|---|---|---|---|---|---|---|---|
10 | -10 | 77 | 129 | 4 | 21 | 1 | 1,640 | 2,160 |
Reference Tempco | 3 ppm/°C |
INL error | 31 ppm of range |
AO Absolute Accuracy Equation
Digital I/O (PFI)
Number of channels | 16 |
Capabilities | Static Digital I/O, Waveform Digital I/O, PFI, Counter, Timer, or Trigger I/O (configurable per line) |
Direction control | Each terminal can be programmed individually as input or output |
Logic family | Selectable in software. All lines share the same setting. 5 V (LVCMOS) 3.3 V 2.5 V 1.8 V |
Default logic family setting | 5.5 V (LVCMOS) |
Electrical Characteristics
Ground reference | D GND |
Direction control | Program each as input or output individually |
Pull-down resistor | 47 kΩ |
Input voltage protection | ±20 V per line, up to two lines simultaneously |
Static Digital I/O Capabilities
Channel names in software | Port0/line0:15 |
Waveform Digital I/O Capabilities
Channel names in software | Port0/line0:15 |
Port/sample size | Up to 16 bits |
Waveform generation (DO) FIFO | 8,191 samples |
Waveform acquisition (DI) FIFO | 1,023 samples |
DO or DI sample clock frequency | 0 MHz to 10 MHz, system and bus activity dependent |
Data transfers | USB Signal Stream, programmed I/O |
Digital line filter settings | 160 ns 10.24 µs 5.12 ms Disable |
PFI Functionality
Channel names in software | PFI0:15 |
Functionality | Timing input Timing output |
Timing output sources | Many AI, AO, counter, DI, and DO timing signals |
Recommended Operating Conditions
|
|
Logic Family | Input Low Voltage (VIL) | Input High Voltage (VIH) | ||
---|---|---|---|---|
Minimum | Maximum | Minimum | Maximum | |
1.8 V | -0.5 V | 0.62 V | 1.19 V | 5.25 V |
2.5 V | -0.5 V | 0.70 V | 1.76 V | 5.25 V |
3.3 V | -0.5 V | 0.80 V | 2.00 V | 5.25 V |
5.0 V | -0.5 V | 1.46 V | 3.66 V | 5.25 V |
Logic Family | Current | Output Low Voltage (VOL) Maximum | Output High Voltage (VOH) Minimum |
---|---|---|---|
1.8 V | 4 mA | 0.36 V | 1.39 V |
2.5 V | 4 mA | 0.32 V | 2.16 V |
3.3 V | 4 mA | 0.31 V | 2.97 V |
5.0 V | 4 mA | 0.30 V | 4.59 V |
Digital I/O Characteristics
IIL input low current (VIN = 0 V) | -1 µA maximum |
IIH input low current (VIN = 5 V) | 110 µA maximum |
General-Purpose Counters
Number of counters/timers | 4 |
Resolution | 32 bits |
Counter measurements | Edge counting Pulse Pulse width Semi-period Period Two-edge separation |
Position measurements | X1, X2, X4 quadrature encoding with Channel Z reloading Two-pulse encoding |
Output applications | Pulse Pulse train Frequency division Equivalent time sampling |
Internal base clocks | 100 MHz 20 MHz 100 kHz |
External base clock frequency | 0 MHz to 25 MHz |
Base clock accuracy | 50 ppm |
Inputs | Gate Source HW_Arm Aux A B Z Up_Down Sample Clock |
Routing options for inputs | Any PFI, many internal signals |
FIFO | 1,023 samples per counter |
Data transfers | USB Signal Stream, Programmed I/O |
Frequency Generator
Number of channels | 1 |
Base clocks | 100 MHz 20 MHz 100 kHz |
Divisors | 1 to 16 |
Base clock accuracy | 50 ppm |
Output can be available on any PFI terminal.
External Digital Triggers
Source | Any PFI |
Polarity | Software-selectable for most signals |
Analog input function | Start Trigger Reference Trigger Pause Trigger Sample Clock Sample Clock Timebase |
Analog output function | Start Trigger Pause Trigger Sample Clock Sample Clock Timebase |
Counter/timer functions | Gate Source HW_Arm Aux A B Z Up_Down Sample Clock |
Digital waveform generation (DO) function | Start Trigger Pause Trigger Sample Clock Sample Clock Timebase |
Digital waveform acquisition (DI) function | Start Trigger Reference Trigger Pause Trigger Sample Clock Sample Clock Timebase |
Bus Interface
USB compatibility | USB 3.0/USB 3.1 Gen 1/USB 3.2 Gen 1 SuperSpeed |
USB Signal Stream | 8, can be used for analog input, analog output, digital input, digital output, or counter input |
USB connector | USB Type-C |
USB-6451 (OEM) LED Color
Control Status
Logic level | 3.3 V |
Output resistance | 470 Ω |
Protection | ±20 V |
+5 V Power Source
Voltage accuracy | No load | +4.87 V to +5.22 V |
Maximum current | +4.76 V to 5.17 V |
|
Power on state | Always on (no user control) |
Overdrive protection during power on/off | ±30 V |
Power Requirements
Do not connect the USB-6451 to a USB 2.0 or lower port. The USB-6451 requires more than 2.5 W to power on.
Product Version | USB Power Rating |
---|---|
USB-6451 (Revision D) | 4.5 W (900 mA at nominal 5 V) |
USB-6451 (Revision F and subsequent revisions) and USB-6451 (OEM) | 4.7 W (940 mA at nominal 5V) |
Power input mating connector | USB Type-C plug for power and data |
Current Limit
DIO and +5 V terminals combined[5]5 The USB-6451 will self-detect the power capability of the USB host to configure the current limit. If the USB-6451 is at 280 mA limit, it will lower the current limit to 50 mA if there is an overdrive or fault condition. The current limit will be reset back to the default 280 mA limit when the fault or load is removed. | Connected to USB 3.0 SuperSpeed Type-A port with 4.5 W power | 50 mA |
Connected to USB 3.0 SuperSpeed Type-C port with ≥7.5 W power | 280 mA |
Maximum Working Voltage
Maximum working voltage refers to the signal voltage plus the common-mode voltage.
Channel to earth | 10.5 V, Measurement Category I |
Measurement Category
This product is rated for Measurement Category I.
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.
Physical Characteristics
Product Version | I/O Connector |
---|---|
USB-6451 | 2x 36-position spring terminals |
USB-6451 (OEM) | 2x 50-pin, 0.100 in. x 0.100 in. ribbon cable header |
Product Version | Dimensions |
---|---|
USB-6451 | 116.7 mm x 177.0 mm x 30.4 mm (4.59 in. x 6.97 in. x 1.20 in.) |
USB-6451 (OEM) | 109.22 mm x 167 mm x 13.6 mm (4.3 in. x 6.58 in. x 0.14 in.) |
Product Version | Weight |
---|---|
USB-6451 | 598 g (1.32 lb) |
USB-6451 (OEM) | 103.1 g (0.23 lb) |
Field Wiring Specifications
The following field wiring specifications do not apply to the USB-6451 (OEM).
Use copper wiring for all connections unless otherwise stated.
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 | -25 °C to 120 °C |
Wires per terminal | One wire per spring terminal; two wires per spring terminal using a 2-wire ferrule |
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USB-6451 (OEM)
Connectors
You can connect the following I/O connectors on the USB-6451 (OEM) using a 0.100 in. x 0.100 in. pitch ribbon cable or PCB socket. Refer to the manufacturer's data sheet for compatibility information.
Connector | Component | Reference Designator(s) on PCB | Manufacturer | Manufacturer Part Number |
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AI | 50-pin header | P1 | 3M | N2550-6002RB |
AO/DIO | 50-pin header | P2 | 3M | N2550-6002RB |
Environmental Characteristics
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Pollution Degree | 2 |
Maximum altitude | 2,000 m |
The following shock and vibration specifications do not apply to the USB-6451 (OEM).
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Calibration
Recommended warm-up time | 15 minutes |
Recommended calibration interval | 2 years |
1 Pairs of single-ended channels are connected to a single ADC. (For example, AI0 and AI8, AI1 and AI9, etc.). When sampling any two single-ended channels connected to the same ADC, the channels are scanned in banks, and the maximum rate decreases to 500 kS/s/ch. In this case, AI0:7 are sampled simultaneously, then AI8:15 are sampled later after a delay controlled by the AIConv.Rate property.
2 The CMRR for the USB-6451 (Revision D) is >90 dB on the ±0.2 V range when the common-mode voltage is above +2 V and >95 dB on the ±5 V range when the common-mode voltage is above +7 V. The CMRR for the USB-6451 (Revision F and subsequent revisions) and USB-6451 (OEM) is >95 dB on the ±5 V range when the common-mode voltage is above +7 V.
3 Output impedance excludes cabling impedance.
4 The USB-6451 will self-detect the power capability of USB host to configure the current limit. If the USB-6451 is at 280 mA limit, it will lower the current limit to 50 mA if there is overdrive or fault condition. The current limit will be reset back to the default 280 mA limit when the fault or load is removed.
5 The USB-6451 will self-detect the power capability of the USB host to configure the current limit. If the USB-6451 is at 280 mA limit, it will lower the current limit to 50 mA if there is an overdrive or fault condition. The current limit will be reset back to the default 280 mA limit when the fault or load is removed.
6 The USB-6451 will perform at the full accuracy specification up to 90% RH operating humidity at ≤40 °C.
In This Section
- USB-6451 and USB-6451 (OEM) Specifications
- Definitions
- Conditions
- USB-6451 AI Connector Pinout
- USB-6451 AO/DIO Connector Pinout
- USB-6451 (OEM) AI Connector Pinout
- USB-6451 (OEM) AO/DIO Connector Pinout
- Analog Input
- Analog Output
- Digital I/O (PFI)
- Bus Interface
- USB-6451 (OEM) LED Color
Control Status
- +5 V Power Source
- Power Requirements
- Current Limit
- Maximum Working Voltage
- Measurement Category
- Physical Characteristics
- Field Wiring Specifications
- USB-6451 (OEM)
Connectors
- Environmental Characteristics
- Calibration