Table Of Contents

USB-6346 Specifications

Version:
    Last Modified: February 14, 2019

    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 25 °C unless otherwise noted.

    Analog Input

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    Note  

    Floating inputs can cause unnecessary power consumption and higher operating temperatures. NI recommends connecting unused analog input channels to AI GND.

    Number of channels

    8 differential

    ADC resolution

    16 bits

    DNL

    No missing codes, warranted

    INL

    Refer to the AI Absolute Accuracy section.

    Sample rate (simultaneous sampling on all channels sampled)

    Maximum

    500 kS/s

    Minimum

    No minimum

    Timing resolution

    10 ns

    Timing accuracy

    50 ppm of sample rate

    Input coupling

    DC

    Input range

    ±1 V, ±2 V, ±5 V, ±10 V

    Maximum working voltage for all analog inputs (AI±)

    Ranges ±10 V, ±5 V

    ±11 V, Measurement Category I

    Ranges ±2 V, ±1 V

    ±9 V, Measurement Category I

    spd-note-caution
    Caution  

    Do not connect the USB-6346 to signals or use for measurements within Measurement Categories II, III, or IV.

    spd-note-caution
    Attention  

    Ne connectez pas le USB-6346 à des signaux et ne l'utilisez pas pour effectuer des mesures dans les catégories de mesure II, III ou IV.

    CMRR (at 60 Hz)

    80 dB

    Bandwidth (small signal)

    2.0 MHz at ±1 V

    2.9 MHz at other ranges

    Input impedance
    Device on

    AI+ to AI GND

    >1 GΩ in parallel with 18 pF

    AI- to AI GND

    >1 GΩ in parallel with 18 pF

    Device off

    AI+ to AI GND

    2.37 kΩ

    AI- to AI GND

    2.37 kΩ

    Input bias current

    ±6 nA

    ±90 nA, maximum over full temperature range

    Crosstalk (at 100 kHz)

    -80 dB

    Input FIFO size

    32 MS shared among channels used

    Data transfers

    USB Signal Stream, programmed I/O

    Overvoltage protection for AI <0..7>

    Device on

    ±30 V

    Device off

    ±15 V

    Input current during overvoltage conditions

    ±6.3 mA maximum/AI pin

    Maximum AI channels in overvoltage

    4

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    Notice  

    Exceeding overvoltage specifications may result in data corruption on non-overvoltaged channels.

    Analog Triggers

    Number of triggers

    1

    Source

    AI <0..7>, APFI 0

    Functions

    Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Sample Clock Timebase

    Source level

    AI <0..7>

    ±Full scale

    APFI 0

    ±10 V

    Resolution

    16 bits

    Modes

    Analog edge triggering, analog edge triggering with hysteresis, and analog window triggering

    Bandwidth (large signal, to -3 dB)

    AI <0..7>

    600 kHz

    APFI 0

    3.9 MHz

    Accuracy

    ±1% of range

    APFI 0 characteristics

    Input impedance

    10 kΩ

    Coupling

    DC

    Protection, power on

    ±30 V

    Protection, power off

    ±15 V

    AI Absolute Accuracy

    Table 1. AI Absolute Accuracy
    Nominal Range Positive Full Scale Nominal Range Negative Full Scale Residual Gain Error (ppm of Reading) Offset Tempco (ppm of Range/°C) Random Noise, σ (μVrms) Absolute Accuracy at Full Scale (μV)
    10 -10 115 2 265 3,225
    5 -5 115 2 148 1,613
    2 -2 117 2 74 650
    1 -1 124 3 50 333
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    Note  

    For more information about absolute accuracy at full scale, refer to the AI Absolute Accuracy Example section.

    Gain tempco

    16.7 ppm/°C

    Reference tempco

    5 ppm/°C

    Residual offset error

    12 ppm of range

    INL error

    126 ppm of range

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    Note  

    Accuracies listed are warranted for up to one year from the device external calibration when the device is within 10 °C of the external calibration temperature and 1 °C of the last self calibration, when averaging 10,000 DC samples. Other accuracies may be calculated for different temperatures and sample sizes using the given equations.

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    Notice  

    This product may become more sensitive to electromagnetic disturbances in the operational environment when test leads are attached or when connected to a test object.

    AI Absolute Accuracy Equation

    AbsoluteAccuracy = Reading · (GainError) + Range · (OffsetError) + NoiseUncertainty

    • GainError = ResidualGainError + GainTempco · (TempChangeFromLastInternalCal) + ReferenceTempco · (TempChangeFromLastExternalCal)
    • OffsetError = ResidualOffsetError + OffsetTempco · (TempChangeFromLastInternalCal) + INLError
    • NoiseUncertainty = Random Noise 3 10 , 000 for a coverage factor of 3 σ and averaging 10,000 points.

    AI Absolute Accuracy Example

    Absolute accuracy at full scale on the analog input channels is determined using the following assumptions:

    • TempChangeFromLastExternalCal = 10 °C
    • TempChangeFromLastInternalCal = 1 °C
    • number_of_readings = 10,000
    • CoverageFactor = 3 σ

    For example, on the 10 V range, the absolute accuracy at full scale is as follows:

    • GainError = 115 ppm + 16.7 ppm · 1 + 5 ppm · 10 = 181.7 ppm
    • OffsetError = 12 ppm + 2 ppm ·1 + 126 ppm = 140 ppm
    • Noise Uncertainty = 265 μ V 3 10 , 000 = 8 µV
    • AbsoluteAccuracy = 10 V · (GainError) + 10 V · (OffsetError) + NoiseUncertainty = 3225 µV

    Analog Output

    Number of channels

    2

    DAC resolution

    16 bits

    DNL

    ±1 LSB, maximum

    Monotonicity

    16 bit guaranteed

    Accuracy

    Refer to the AO Absolute Accuracy section.

    Maximum update rate (simultaneous)

    1 channel

    900 kS/s

    2 channels

    840 kS/s

    Minimum update rate

    No minimum

    Timing accuracy

    50 ppm of sample rate

    Timing resolution

    10 ns

    Output range

    ±10 V

    Output coupling

    DC

    Output impedance

    0.2 Ω

    Output current drive

    ±5 mA

    Overdrive protection

    ±15 V

    Overdrive current

    15 mA

    Power-on state

    ±20 mV

    Power-on/off glitch[1]

    2 V peak for 1.5 s

    Output FIFO size

    8,191 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)

    6 µs

    Slew rate

    15 V/µs

    Glitch energy at midscale transition

    100 mV · 2.6 µs

    AO Absolute Accuracy

    Accuracies listed are warranted for up to one year from the device external calibration when the device is within 10 °C of the external calibration temperature and 1 °C of the last self calibration.

    Table 2. AO Absolute Accuracy
    Nominal Range Positive Full Scale Nominal Range Negative Full Scale Residual Gain Error (ppm of Reading) Gain Tempco (ppm/°C) Reference Tempco (ppm/°C) Residual Offset Error (ppm of Range) Offset Tempco (ppm of Range/°C) INL Error (ppm of Range) Absolute Accuracy at Full Scale (μV)
    10 -10 130 11.3 5 52 4.8 128 3,761

    AO Absolute Accuracy Equation

    AbsoluteAccuracy = OutputValue ⋅ (GainError) + Range ⋅ (OffsetError)

    • GainError = ResidualGainError + GainTempco ⋅ (TempChangeFromLastInternalCal) + ReferenceTempco ⋅ (TempChangeFromLastExternalCal)
    • OffsetError = ResidualOffsetError + OffsetTempco ⋅ (TempChangeFromLastInternalCal) + INLError

    Digital I/O/PFI

    Static Characteristics

    Number of channels

    24 total

    8 (P0.<0..7>)

    16 (PFI <0..7>/P1, PFI <8..15>/P2)

    Ground reference

    D GND

    Direction control

    Each terminal individually programmable as input or output

    Pull-down resistor

    50 kΩ, typical

    20 kΩ, minimum

    Input voltage protection

    ±20 V on up to two pins

    spd-note-notice
    Notice  

    Stresses beyond those listed under the Input voltage protection specification may cause permanent damage to the device.

    Waveform Characteristics (Port 0 Only)

    Terminals used

    Port 0 (P0.<0..7>)

    Port/sample size

    Up to 8 bits

    Waveform generation (DO) FIFO

    2,047 samples

    Waveform acquisition (DI) FIFO

    255 samples

    DI Sample Clock frequency

    0 to 1 MHz, system and bus activity dependent

    DO Sample Clock frequency

    Regenerate from FIFO

    0 to 1 MHz

    Streaming from memory

    0 to 1 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/Port 1/Port 2 Functionality

    Functionality

    Static digital input, static digital output, timing input, timing output

    Timing output sources

    Many AI, AO, counter, DI, DO timing signals

    Debounce filter settings

    90 ns, 5.12 µs, 2.56 ms, custom interval, disable; programmable high and low transitions; selectable per input

    Recommended Operating Conditions

    Input high voltage (VIH)

    Minimum

    2.2 V

    Maximum

    5.25 V

    Input low voltage (VIL)

    Minimum

    0 V

    Maximum

    0.8 V

    Output high current (IOH)

    P0.<0..7>

    -24 mA, maximum

    PFI <0..15>/P1/P2

    -16 mA, maximum

    Output low current (IOL)

    P0.<0..7>

    24 mA, maximum

    PFI <0..15>/P1/P2

    16 mA, maximum

    Digital I/O Characteristics

    Positive-going threshold (VT+)

    2.2 V, maximum

    Negative-going threshold (VT-)

    0.8 V, minimum

    Delta VT hysteresis (VT+ - VT-)

    0.2 V , minimum

    IIL input low current (VIN = 0 V)

    -10 μA, maximum

    IIH input high current (VIN = 5 V)

    250 μA, maximum

    Figure 1. P0.<0..7>: IOH versus VOH
    Figure 2. P0.<0..7>: IOL versus VOL
    Figure 3. PFI <0..15>/P1/P2: IOH versus VOH
    Figure 4. PFI <0..15>/P1/P2: IOL versus VOL

    General-Purpose Counters

    Number of counter/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 with dynamic updates, 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

    127 samples per counter

    Data transfers

    USB Signal Stream, programmed I/O

    Frequency Generator

    Number of channels

    1

    Base clocks

    20 MHz, 10 MHz, 100 kHz

    Divisors

    1 to 16

    Base clock accuracy

    50 ppm

    Output can be available on any PFI terminal.

    Phase-Locked Loop (PLL)

    Number of PLLs

    1

    Table 3. Reference Clock Locking Frequencies
    Reference Signal USB Locking Input Frequency
    PFI <0..15> 10 MHz

    Output of PLL

    100 MHz Timebase; other signals derived from 100 MHz Timebase including 20 MHz and 100 kHz Timebases

    External Digital Triggers

    Source

    Any PFI

    Polarity

    Software-selectable for most signals

    Analog input function

    Start Trigger, Reference Trigger, Pause Trigger, Sample Clock, Convert 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[2]

    USB 2.0 Hi-Speed or full-speed

    USB Signal Stream

    8 (can be used for analog input, analog output, digital input, digital output, counter/timer 0, counter/timer 1, counter/timer 2, counter/timer 3)

    Power Requirements

    spd-note-caution
    Caution  

    The protection provided by the USB-6346 can be impaired if it is used in a manner not described in the user documentation.

    spd-note-caution
    Attention  

    La protection apportée par le USB-6346 risque d'être endommagée s'il est utilisé d'une autre façon que celle décrite dans la documentation utilisateur.

    Power supply requirements

    11 V DC to 30 V DC, 30 W, 2 positions 3.5 mm pitch pluggable screw terminal with screw locks similar to Phoenix Contact MC 1,5/2-STF-3,5 BK

    Power input mating connector

    Phoenix Contact MC 1,5/2-GF-3,5 BK or equivalent

    spd-note-caution
    Caution  

    The USB-6346 must be powered with an AC adapter offered by NI or a National Electric Code (NEC) Class 2 DC source that meets the power requirements for the device and has appropriate safety certification marks for country of use.

    spd-note-caution
    Attention  

    Le USB-6346 doit être alimenté par un adaptateur secteur proposé par NI ou une source de courant continu de classe 2, selon la norme NEC (National Electric Code), qui répond aux exigences d'alimentation de l'appareil et possède les marques de certification de sécurité appropriées pour le pays d'utilisation.

    Current Limits

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    Notice  

    Exceeding the current limits may cause unpredictable device behavior.

    +5 V terminal (connector 0)

    1 A, maximum

    spd-note-note
    Note  

    Connector 0 has a self-resetting fuse that opens when current exceeds this specification.

    P0/PFI/P1/P2 and +5 V terminals combined

    1.2 A, maximum

    Physical Characteristics

    Screw terminal

    Enclosure dimensions (includes connectors)

    26.4 cm × 17.3 cm × 3.6 cm (10.39 in. × 6.81 in. × 1.42 in.)

    Weight

    1.45 kg (3 lb 3 oz)

    I/O connectors

    64 screw terminals

    BNC

    Enclosure dimensions (includes connectors)

    20.3 cm × 18.5 cm × 6.8 cm (7.99 in. × 7.28 in. × 2.68 in.)

    Weight

    1.80 kg (4 lb 0 oz)

    I/O connectors

    20 BNC terminals

    30 screw terminals

    Screw terminal wire gauge

    0.2 mm2 to 1.3 mm2 (24 AWG to 16 AWG)

    Calibration

    Recommended warm-up time

    15 minutes

    Calibration interval

    1 year

    Maximum Working Voltage

    Maximum working voltage refers to the signal voltage plus the common-mode voltage.

    Channel to earth

    11 V, Measurement Category I

    spd-note-caution
    Caution  

    Do not connect the USB-6346 to signals or use for measurements within Measurement Categories II, III, or IV.

    spd-note-caution
    Attention  

    Ne connectez pas le USB-6346 à des signaux et ne l'utilisez pas pour effectuer des mesures dans les catégories de mesure II, III ou IV.

    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.

    spd-note-note
    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 Guidelines

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    Notice  

    This model is intended for use in indoor applications only.

    Environmental Characteristics

    Temperature

    Operating

    0 °C to 45 °C

    Storage

    -40 °C to 70 °C

    Humidity

    Operating

    10% to 90% RH, noncondensing

    Storage

    5% to 95% RH, noncondensing

    Pollution Degree

    2

    Maximum altitude

    2,000 m (800 mbar) (at 25 °C ambient temperature)

    • 1 Typical behavior. Time period may be longer due to host system USB performance. Time period will be longer during firmware updates.
    • 2 Operating on a full-speed bus results in lower performance, and you might not be able to achieve maximum sampling/update rates.

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