Table Of Contents

PXIe-2540 Specifications

    Last Modified: April 19, 2017

    This document lists specifications for the PXIe-2540. All specifications are subject to change without notice.

    PXIe-2540 Specifications

    Specifications characterize the warranted performance of the instrument under the stated operating conditions. Data in this document are Specifications unless otherwise noted.

    Typical Specifications are specifications met by the majority of the instrument under the stated operating conditions and are tested at 23 °C ambient temperature. Typical specifications are not warranted.

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


    The protection provided by the PXIe-2540 can be impaired if it is used in a manner not described in this document.



    8 × 9 matrix

    Input Characteristics

    Maximum switching voltage

    60 V DC (42.4 Vpk)

    Maximum switching or carry current (per channel)

    0.5 A


    The switching power is limited by the maximum switching current and the maximum voltage, and must not exceed 10 W.

    Maximum DC switching or carry power (per channel)

    10 W

    Maximum RF power (per channel, 50 Ω system)

    10 W

    Simultaneous channels at maximum RF power (up to 350 MHz)



    Maximum RF power derates as frequency and number of simultaneous channels increase and must not exceed the values shown in the following figures.

    Figure 1. Maximum RF Input Power

    NI recommends against switching active RF signals. As a relay actuates, the channel is momentarily unterminated. Some RF sources can be damaged by reflections if their outputs are not properly terminated. Consult your RF source documentation for more information.

    DC path resistance


    <2.1 Ω, typical


    ≥3.1 Ω, typical

    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 rises rapidly above 3.1 Ω.

    RF Performance Characteristics

    Characteristic impedance (Z0)

    50 Ω, nominal

    Insertion loss

    ≤350 MHz

    <3 dB (<2.3 dB, typical)

    Refer to the following figure for the insertion loss of the PXIe-2540.

    Figure 2. Insertion Loss, Typical

    ≤350 MHz

    <2.2 (<1.6, typical)

    Refer to the following figure for the VSWR of the PXIe-2540.

    Figure 3. VSWR, Typical
    Open CH isolation

    ≤350 MHz

    >75 dB, typical

    Refer to the following figure for the channel-to-channel isolation of the PXIe-2540.

    Figure 4. Open Channel Isolation, Typical

    ≤350 MHz

    <-35 dB, typical

    Refer to the following figure for the crosstalk of the PXIe-2540.

    Figure 5. Crosstalk, Typical

    Propagation delay

    <6 ns, typical

    CH-CH skew

    <2 ns, typical

    Dynamic Characteristics

    Simultaneous drive limit

    40 relays

    Maximum operate time

    0.25 ms

    Maximum release time

    0.25 ms


    Certain applications may require additional time for proper settling. Refer to the NI Switches Help at for information about including additional settling time.

    Relay life


    1 × 109 cycles, typical

    Electrical (resistive, <10 pF load, DC or 50 Ω RF systems)

    10 V, 100 mA

    1 × 107 cycles, typical

    20 V, 500 mA

    5 × 106 cycles, typical


    Reed relays are highly susceptible to damage caused by switching capacitive and inductive loads. Capacitive loads can cause high inrush currents while inductive loads can cause high flyback voltages. The addition of appropriate protection can greatly improve contact lifetime. For more information about adding protection circuitry to a capacitive load, visit and enter the Info Code relaylifetime. For information about inductive loads, enter the Info Code relayflyback.

    Trigger Characteristics

    Input trigger


    PXI trigger lines <0...7>

    Minimum pulse width

    150 ns


    The PXIe-2540 can recognize trigger pulse widths less than 150 ns by disabling digital filtering. For information about disabling digital filtering, refer to the NI Switches Help at

    Output trigger


    PXI trigger lines <0...7>

    Pulse width

    Programmable (1 μs to 62 μs)

    Physical Characteristics

    Relay type

    Reed, non-latching

    Relay contact material


    I/O connectors

    17 MCX jacks

    Power requirement


    10 W at 5 V

    2 W at 3.3 V

    PXI Express

    10 W at 12 V

    2.5 W at 3.3 V

    Dimensions (L × W × H)

    3U, one slot, PXI/cPCI module, PXIe compatible 21.6 cm × 2.0 cm × 13.0 cm (8.5 in. × 0.8 in. × 5.1 in.)


    380 g (13.40 oz)


    Operating temperature

    0 °C to 55 °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 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
    • EN 55022 (CISPR 22): Class A emissions
    • EN 55024 (CISPR 24): Immunity
    • AS/NZS CISPR 11: Group 1, Class A emissions
    • AS/NZS CISPR 22: 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:

    • 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

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