Table Of Contents

PXI-2512 Specifications

    Last Modified: December 13, 2017


    The protection provided by the PXI-2512 can be impaired if it is used in a manner not described in this document.


    Warranted specifications describe the performance of a model under stated operating conditions and are covered by the model warranty.

    The following characteristic specifications 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 Warranted unless otherwise noted.


    Specifications are valid under the following conditions unless otherwise noted.

    • The PXI/PXIe chassis fan speed is set to High.
    • The fan filters are clean.
    • The empty slots contain filler panels.

    For more information, refer to the Maintain Forced-Air Cooling Note to Users document available at





    All input specifications are DC, ACrms, or a combination unless otherwise specified.


    Steady state voltages applied to the PXI-2512 between any two I/O connector pins in excess of the maximum switching voltage specification may damage this module.


    This module is rated for Measurement Category I and intended to carry signal voltages no greater than 30 Vrms/42 Vpk/50 VDC. Do not use this module for connection to signals or for measurements within Categories II, III, or IV. Do not connect to MAINs supply circuits (for example, wall outlets) of 115 or 230 VAC.

    Maximum switching voltage

    50 VDC, 30 V ACrms, CAT I[2]

    Maximum continuous current

    10 A (per channel or common, switching or carry)

    Maximum pulsed current

    50 A (for 600 μs max)

    Maximum switching power (per channel)[3]

    500 W

    Use the following equation to determine the maximum possible pulse width (seconds) for a given maximum inrush current “peak” amplitude (A) and steady state current (A).

    MaxPulseWidth = 1.512 0.01 ( I SteadyState ) 2 ( I PeakInrush ) 2

    DC path resistance

    16 mΩ, typical

    35 mΩ, maximum

    Bandwidth (50 Ω system)

    >800 kHz, typical

    Overcurrent Detection[4]

    Overcurrent detection limit

    10.5 A, typical

    Overcurrent detection delay

    20 ms

    Overtemperature Detection[5][6]

    To help protect against fault conditions, the PXI-2512 incorporates circuitry to detect overtemperature conditions.

    The Switching Current Waveform graph figure indicates where on the inrush waveform you can find the parameters necessary for determining maximum cycle rate.

    Figure 1. Switching Current Waveform
    Figure 2. Maximum Cycle Rate
    Figure 3. Maximum Cycle Rate Derating Factor by Pulse Width

    Determining the Maximum Cycle Rate

    Complete the following steps using the previous figures to determine the maximum cycle rate at which a channel can be switched when the peak impulse current value and duration are known:
    1. Using the Maximum Cycle Rate figure, choose the plot line that meets or exceeds the peak inrush current value of the signal being switched. Find the point on the trace that equates to the steady state current being switched by the load.
    2. Find the corresponding intersection on the y-axis that indicates the maximum cycle rate allowed for a signal with a 50 μs maximum inrush pulse duration.
    3. Find the point in the Maximum Cycle Rate Derating Factor by Pulse Width figure that corresponds to the measured pulse width of the inrush current pulse. Find the corresponding derating factor.
      Then calculate the maximum cycle rate using the following equation:
      MaxCycleRate = C R 50 μ s D F ( H z )

      where CR50 μs is the maximum cycle rate for a 50 μs wide inrush current pulse in Hz, and DF is the derating factor.


      If the peak impulse current does not exceed 10 A, do not derate the maximum cycle rate below 220 Hz.

    For switching a steady state current of 4 A into a load with peak inrush current of 45 A that lasts for 400 μs, choose the 50 A plot line in the Maximum Cycle Rate figure. Find the y-axis value that corresponds to the 4 A load current (650 Hz). Then find the derating factor in the Maximum Cycle Rate Derating Factor by Pulse Width figure that corresponds to 400 μs, which is 0.1.

    The maximum cycle rate at which this signal can be switched by the module is calculated as follows:

    MaxCycleRate = 650 H z 0.1 65 H z


    Relay operate time[7]

    8 μs, typical

    35 μs, maximum

    Typical relay life

    Unlimited, when operated within specified limits


    Input trigger


    PXI trigger lines <0...7>

    Minimum pulse width[8]

    150 ns

    Output trigger


    PXI trigger lines <0...7>

    Pulse width

    Software-selectable: 1 µs to 62 µs


    Relay type


    Front panel connector

    2 DSUB, 8 positions, male

    Power requirement

    3.3 V

    1.0 W

    5 V

    13.0 W

    PXI Express

    +12 V

    14.7 W

    3.3 V

    1.4 W

    Dimensions (L × W × H)

    3U, two slots, PXI/cPCI module, PXI Express compatible

    21.6 cm × 4.1 cm × 13.0 cm (8.5 in. × 1.6 in. × 5.1 in.)


    403 g (14.2 oz)


    Operating temperature

    0 °C to 50 °C

    Storage temperature

    -40 °C to 70 °C

    Relative humidity

    5% to 85%, noncondensing

    Pollution Degree


    Maximum altitude

    2,000 m

    Indoor use only.

    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


    5 Hz to 500 Hz, 0.3 grms


    5 Hz 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.)

    Compliance and Certifications


    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 61010-1

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

    Electromagnetic Compatibility

    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

    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.


    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.


    For EMC declarations, certifications, and additional information, refer to the Online Product Certification section.

    CE Compliance

    This product meets the essential requirements of applicable European Directives, as follows:
    • 2006/95/EC; Low-Voltage Directive (safety)
    • 2004/108/EC; Electromagnetic Compatibility Directive (EMC)

    Online Product Certification

    Refer to the product Declaration of Conformity (DoC) for additional regulatory compliance information. To obtain product certifications and the DoC for this product, visit, 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 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)

    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



    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。(For information about China RoHS compliance, go to

    • 1 Signal connections through the PXI-2512 are intended to go through the DUTn pin connections. Signal paths that do not use the DUTn pin connections may exceed the module’s thermal capabilities.
    • 2 Measurement Categories CAT I and CAT O (Other) are equivalent. These test and measurement circuits are not intended for direct connection to the MAINs building installations of Measurement Categories CAT II, CAT III, or CAT IV.
    • 3 The maximum switching power is limited by the maximum switching current and the maximum voltage, and must not exceed 500 W.
    • 4 After a switch operation, an overcurrent error condition occurs when both the overcurrent limit of the module is exceeded, and the overcurrent delay time has expired.
    • 5 Exceeding the module’s thermal limit induces an overtemperature condition.
    • 6 Overtemperature conditions are created when excessive power is dissipated in the channel paths such as when switching large impulses created by switching into capacitive or inductive loads or when switching a signal at a higher rate than the module dissipates the generated heat. Refer to the figures below for information about the maximum cycle rate.
    • 7 Certain applications may require additional time for proper settling. Refer to the NI Switches Help for more information about including additional settling time.
    • 8 The PXI-2512 can recognize trigger pulse widths less than 150 ns if you disable digital filtering. Refer to the NI Switches Help for information about disabling digital filtering.

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