Table Of Contents

PXI-2503 Specifications

    Last Modified: August 24, 2020


    The protection provided by the PXI-2503 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 Typical unless otherwise noted.


    Specifications are valid at 23 °C unless otherwise noted.

    All voltages are specified in DC, ACpk, or a combination unless otherwise specified.



    1-wire 64 × 1 multiplexer

    1-wire 48 × 1 multiplexer[]

    2-wire 24 × 1 multiplexer[]

    2-wire Dual 12 × 1 multiplexers

    2-wire Quad 6 × 1 multiplexers

    4-wire 12 × 1 multiplexer

    2-wire 4 × 6 matrix


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


    The switching power is limited by the maximum switching current and the maximum voltage. Switching power must not exceed 30 W (37.5 VA) per channel.

    Maximum switching voltage (channel-to-channel and channel-to-ground)

    30 VAC, 60 VDC

    Maximum switching current (per channel)

    1 A

    Maximum carry current (per channel)

    1 A

    Maximum switching power (per channel)

    30 W

    Minimum switch load

    10 μA, 10 mV

    DC path resistance[2]


    <1 Ω, warranted


    >2 Ω

    Thermal EMF (differential)

    <2 μV

    RF Performance

    Bandwidth (50 Ω termination)

    ≥10 MHz, typical

    Channel-to-channel isolation (50 Ω termination)

    10 kHz

    >100 dB, typical

    100 kHz

    >80 dB, typical

    1 MHz

    >55 dB, typical

    10 MHz

    >30 dB, typical


    Maximum scan rate

    100 channels/s, typical

    Relay operate time (at 20 °C)[3]

    3 ms, typical

    5 ms, maximum

    Release time (at 20 °C)

    1.5 ms, typical

    5 ms, maximum

    Expected relay life


    5 × 107 cycles

    Electrical (maximum load)

    2 × 105 cycles


    Input trigger


    PXI trigger lines <0...7>, front panel

    Minimum pulse width

    PXI trigger lines

    70 ns

    Front panel

    500 ns

    Output trigger


    PXI trigger lines <0...7>, front panel

    Pulse width

    1 μs


    Relay type

    Electromechanical, nonlatching

    I/O connector

    68-pin male SCSI

    Power requirement

    +5 VDC

    370 mA, typical

    700 mA, maximum

    Relay contact material

    Gold-clad silver alloy

    Dimensions (L × W × H)

    3U, one slot, PXI/cPCI module

    21.6 cm × 2.0 cm × 13.0 cm (8.5 in. × 0.8 in. × 5.1 in.)


    228 g (8 oz)


    Operating temperature

    0 °C to 50 °C

    Storage temperature

    -20 °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 C22.2 No. 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 and certifications, refer to the Online Product Certification 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)

    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 The 1-wire 48 × 1 and the 2-wire 24 × 1 multiplexer topologies can enable a unity gain amplifier to reduce FET settling time.
    • 2 Path resistance is a combination of relay contact resistance and trace resistance. Contact resistance typically remains low for the life of a relay. At the end of relay life, the contact resistance rapidly rises above 1.0 Ω.
    • 3 Certain applications might require additional time for proper settling. For information about including additional settling time, refer to the NI Switches Help.

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