Table Of Contents

USB-6341 Specifications

Version:
    Last Modified: February 27, 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 at 25 °C unless otherwise noted.

    Analog Input

    Number of channels

    16 single ended or 8 differential

    ADC resolution

    16 bits

    DNL

    No missing codes guaranteed

    INL

    Refer to AI Absolute Accuracy.

    Sample rate

    Single channel maximum

    500 kSample/s

    Multichannel maximum (aggregate)

    500 kSample/s

    Minimum

    No minimum

    Timing resolution

    10 ns

    Timing accuracy

    50 ppm of sample rate

    Input coupling

    DC

    Input range

    ±0.2 V, ±1 V, ±5 V, ±10 V

    Maximum working voltage for analog inputs (signal + common mode)

    ±11 V of AI GND

    CMRR (DC to 60 Hz)

    100 dB

    Input impedance
    Device on

    AI+ to AI GND

    >10 GΩ in parallel with 100 pF

    AI- to AI GND

    >10 GΩ in parallel with 100 pF

    Device off

    AI+ to AI GND

    1,200 Ω

    AI- to AI GND

    1,200 Ω

    Input bias current

    ±100 pA

    Crosstalk (at 100 kHz)

    Adjacent channels

    -75 dB

    Non-adjacent channels

    -90 dB

    Small signal bandwidth (-3 dB)

    1.2 MHz

    Input FIFO size

    2,047 samples

    Scan list memory

    4,095 entries

    Data transfers

    USB Signal Stream, programmed I/O

    Overvoltage protection for all analog input and sense channels

    Device on

    ±25 V for up to two AI pins

    Device off

    ±15 V for up to two AI pins

    Input current during overvoltage condition

    ±20 mA maximum/AI pin

    Settling Time for Multichannel Measurements

    Settling time for multichannel measurements, accuracy, full-scale step, all ranges

    ±90 ppm of step (±6 LSB)

    2 μs convert interval

    ±30 ppm of step (±2 LSB)

    3 μs convert interval

    ±15 ppm of step (±1 LSB)

    5 μs convert interval

    Typical Performance Graph

    Figure 1. Settling Error versus Time for Different Source Impedances

    AI Absolute Accuracy (Warranted)

    Table 1. AI Absolute Accuracy
    Nominal Range Positive Full Scale (V) Nominal Range Negative Full Scale (V) Residual Gain Error (ppm of Reading) Residual Offset Error (ppm of Range) Offset Tempco (ppm of Range/°C) Random Noise, σ (μVrms) Absolute Accuracy at Full Scale (μV)
    10 -10 65 13 23 270 2,190
    5 -5 72 13 23 135 1,130
    1 -1 78 17 26 28 240
    0.2 -0.2 105 27 39 9 60
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    Note  

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

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    Note  

    Accuracies listed are valid for up to two years from the device external calibration.

    Gain tempco

    7.3 ppm/°C

    Reference tempco

    5 ppm/°C

    INL error

    60 ppm of range

    AI Absolute Accuracy Equation

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

    • 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

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

    • GainError: 65 ppm + 7.3 ppm · 1 + 5 ppm · 10 = 122 ppm
    • OffsetError: 13 ppm + 23 ppm · 1 + 60 ppm = 96 ppm
    • NoiseUncertainty: 270 µ V 3 10 , 000 = 8.1 μV
    • AbsoluteAccuracy: 10 V · (GainError) + 10 V · (OffsetError) + NoiseUncertainty = 2,190 μV

    Analog Output

    Number of channels

    2

    DAC resolution

    16 bits

    DNL

    ±1 LSB

    Monotonicity

    16 bit guaranteed

    Maximum update rate (simultaneous)

    1 channel

    900 kSample/s

    2 channels

    840 kSample/s per channel

    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

    1.5 V for 1.2 s[1]

    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

    Magnitude

    100 mV

    Duration

    2.6 µs

    AO Absolute Accuracy

    Table 2. AO Absolute Accuracy
    Nominal Range Positive Full Scale (V) Nominal Range Negative Full Scale (V) 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 80 11.3 5 53 4.8 128 3,271
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    Note  

    Absolute Accuracy at Full Scale numbers are valid immediately following self calibration and assumes the device is operating within 10 °C of the last external calibration.

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    Note  

    Accuracies listed are valid for up to two years from the device external calibration.

    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-caution
    Caution  

    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

    DO or DI Sample Clock frequency

    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 2. P0.<0..7>: I OH versus V OH
    Figure 3. P0.<0..7>: I OL versus V OL
    Figure 4. PFI <0..15>/P1/P2: I OH versus V OH
    Figure 5. PFI <0..15>/P1/P2: I OL versus V OL

    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 or RTSI terminal.

    Phase-Locked Loop (PLL)

    Number of PLLs

    1

    PFI <0..15> reference clock locking frequency

    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

    USB 2.0 Hi-Speed or full-speed[2]

    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 device can be impaired if the device is used in a manner not described in the X Series User Manual.

    spd-note-caution
    Caution  

    The USB device must be powered with an NI offered AC adapter 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.

    Power supply requirements

    11 VDC to 30 VDC, 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

    Current Limits

    spd-note-caution
    Caution  

    Exceeding the current limits may cause unpredictable device behavior.

    +5 V terminal

    1 A maximum[3]

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

    2 A maximum

    Physical Characteristics

    Enclosure dimensions (includes connectors)

    BNC

    20.3 cm × 18.5 cm × 6.8 cm (8.0 in. × 7.3 in. × 2.7 in.)

    Screw terminal

    26.4 cm × 17.3 cm × 3.6 cm (10.4 in. × 6.8 in. × 1.4 in.)

    Weight

    BNC

    1.520 kg (3 lb 5.6 oz)

    Screw terminal

    1.406 kg (3 lb 1.6 oz)

    I/O connectors
    BNC

    Device connector

    20 BNCs and 30 screw terminals

    Screw terminal wiring gauge

    0.2047 mm2 to 1.3087 mm2 (16 AWG to 24 AWG)

    Screw terminal

    Device connector

    64 screw terminals

    Screw terminal wiring gauge

    0.2047 mm2 to 1.3087 mm2 (16 AWG to 24 AWG)

    spd-note-note
    Note  

    For more information about the connectors used for DAQ devices, refer to the document, NI DAQ Device Custom Cables, Replacement Connectors, and Screws, by going to ni.com/info and entering the Info Code rdspmb.

    Calibration

    Recommended warm-up time

    15 minutes

    Calibration interval

    2 years

    Maximum Working Voltage

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

    Channel to earth

    11 V, 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.

    spd-note-caution
    Caution  

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

    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.

    Shock and Vibration

    Operational shock

    30 g peak, half-sine, 11 ms pulse

    (Tested in accordance with IEC 60068-2-27. Test profile developed in accordance with MIL-PRF-28800F.)

    Random vibration

    Operating

    5 to 500 Hz, 0.3 grms

    Nonoperating

    5 to 500 Hz, 2.4 grms

    (Tested in accordance with IEC 60068-2-64. Nonoperating test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

    Environmental

    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

    Indoor use only.

    Safety Compliance Standards

    This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:

    • IEC 61010-1, EN 61010-1
    • UL 61010-1, CSA C22.2 No. 61010-1
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    Note  

    For UL and other safety certifications, refer to the product label or the Product Certifications and Declarations section.

    Electromagnetic Compatibility Standards

    This product meets the requirements of the following EMC standards for electrical equipment for measurement, control, and laboratory use:

    • EN 61326-1 (IEC 61326-1): Class A emissions; Basic immunity
    • EN 55011 (CISPR 11): Group 1, Class A emissions
    • AS/NZS CISPR 11: Group 1, Class A emissions
    • FCC 47 CFR Part 15B: Class A emissions
    • ICES-001: Class A emissions
    spd-note-note
    Note  

    Group 1 equipment (per CISPR 11) is any industrial, scientific, or medical equipment that does not intentionally generate radio frequency energy for the treatment of material or inspection/analysis purposes.

    spd-note-note
    Note  

    In the United States (per FCC 47 CFR), Class A equipment is intended for use in commercial, light-industrial, and heavy-industrial locations. In Europe, Canada, Australia and New Zealand (per CISPR 11) Class A equipment is intended for use only in heavy-industrial locations.

    spd-note-notice
    Notice  

    For EMC declarations and certifications, and additional information, refer to the Product Certifications and Declarations section.

    CE Compliance

    This product meets the essential requirements of applicable European Directives, as follows:

    • 2014/35/EU; Low-Voltage Directive (safety)
    • 2014/30/EU; Electromagnetic Compatibility Directive (EMC)
    • 2011/65/EU; Restriction of Hazardous Substances (RoHS)

    Product Certifications and Declarations

    Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for NI products, visit ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.

    Environmental Management

    NI is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers.

    For additional environmental information, refer to the Minimize Our Environmental Impact web page at ni.com/environment. This page contains the environmental regulations and directives with which NI complies, as well as other environmental information not included in this document.

    Waste Electrical and Electronic Equipment (WEEE)

    spd-note-weee
    EU Customers  

    At the end of the product life cycle, all NI products must be disposed of according to local laws and regulations. For more information about how to recycle NI products in your region, visit ni.com/environment/weee.

    电子信息产品污染控制管理办法(中国RoHS)

    spd-note-china-rohs
    中国客户  

    National Instruments符合中国电子信息产品中限制使用某些有害物质指令(RoHS)。关于National Instruments中国RoHS合规性信息,请登录 ni.com/environment/rohs_china。(For information about China RoHS compliance, go to ni.com/environment/rohs_china.)

    • 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.
    • 3 Has self-resetting fuse that opens when current exceeds this specification.

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