Table Of Contents

PXI-2575 Specifications

    Last Modified: August 24, 2020


    The protection provided by the PXI-2575 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 196 × 1 multiplexer

    2-wire 95 × 1 multiplexer

    2-wire 98 × 1 multiplexer



    This module is rated for Measurement Category I and intended to carry signal voltages no greater than 100 V. This module can withstand up to 500 V impulse voltage. 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. Refer to the Read Me First: Safety and Electromagnetic Compatibility document for more information on measurement categories.


    When hazardous voltages (>42.4 Vpk/ 60 VDC) are present on any relay terminal, safety low-voltage (≤42.4 Vpk/60 VDC) cannot be connected to any other relay terminal.

    Maximum switching voltage


    100 V


    100 V, CAT I


    The switching power is limited by the maximum switching current, the maximum voltage, and must not exceed 60 W, 62.5 VA.

    Maximum switching power (per channel)

    60 W, 62.5 VA (DC to 60 Hz)

    DC isolation resistance (between channel and COM terminals)[1]

    >1 GΩ, typical at 25 °C

    Maximum total current (switching or carry)

    1 A

    Minimum switch load[2]

    20 mV/1 mA

    DC path resistance[3]


    <0.5 Ω, warranted


    ≥1.0 Ω

    Differential thermal EMF

    3 μV, typical[4]

    <12 μV, maximum

    Bandwidth (-3 dB, 50 Ω termination)


    >20 MHz


    >8 MHz

    Channel-to-channel isolation (50 Ω termination)[5]
    1-wire channels in different relays

    10 kHz

    >90 dB

    100 kHz

    >70 dB

    1 MHz

    >50 dB

    1-wire channels in the same relay

    10 kHz

    >68 dB

    100 kHz

    >48 dB

    1 MHz

    >28 dB

    2-wire channels

    10 kHz

    >95 dB

    100 kHz

    >75 dB

    1 MHz

    >55 dB

    Open channel isolation (50 Ω termination)

    10 kHz

    >90 dB

    100 kHz

    >70 dB

    1 MHz

    >50 dB


    Relay operate time[6]

    1 ms, typical

    3.4 ms, maximum

    Expected relay life[7]


    1 × 108 cycles


    10 VDC, 100 mADC resistive

    2.5 × 106 cycles

    10 VDC, 1 ADC resistive

    1 × 106 cycles

    30 VDC, 1 ADC resistive

    5 × 105 cycles

    60 VDC, 1 ADC resistive

    1 × 105 cycles


    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

    Electromechanical, latching

    Relay contact material

    Silver, gold covered

    I/O connector

    200 POS LFH Matrix 50, receptacle

    Power requirement


    6 W at 5 V

    2.5 W at 3.3 V

    PXI Express

    7.5 W at 12 V

    2.5 W at 3.3 V

    Dimensions (L × W × H)

    3U, one slot, PXI/cPCI module

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


    231 g (8.1 oz)


    Maximum altitude

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

    Pollution Degree


    Indoor use only.

    Operating Environment

    Ambient temperature range

    0 °C to 55 °C (Tested in accordance with IEC 60068-2-1 and IEC 60068-2-2.)

    Relative humidity range

    10% to 90%, noncondensing (Tested in accordance with IEC 60068-2-56.)

    Storage Environment

    Ambient temperature range

    -40 °C to 71 °C (Tested in accordance with IEC 60068-2-1 and IEC 60068-2-2.)

    Relative humidity range

    5% to 95%, noncondensing (Tested in accordance with IEC 60068-2-56.)

    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, 0.31 grms (Tested in accordance with IEC 60068-2-64.)


    5 Hz to 500 Hz, 2.46 grms (Tested in accordance with IEC 60068-2-64. 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 PXI-2575 is not recommended for 2-wire resistance measurements.
    • 2 Switching inductive loads (for example, motors and solenoids) can produce high voltage transients in excess of the module’s rated voltage. Without additional protection, these transients can interfere with module operation and impact relay life. For more information about transient suppression, visit and enter the Info Code relayflyback.
    • 3 DC path resistance typically remains low for the life of the relay. At the end of relay life, the path resistance rises rapidly above 1 Ω. Load ratings apply to relays used within the specification before the end of relay life.
    • 4 To ensure the typical thermal EMF, power down all relays and avoid pulsing high currents near the channels you are measuring. For more information about powering down latching relays, refer to the Power Down Latching Relays After Debounce property in NI-SWITCH or the Power Down Latching Relays After Settling property in NI-DAQmx.
    • 5 Each relay in the PXI-2575 is shared by two channels.
    • 6 Certain applications may require additional time for proper settling. Refer to NI Switches Help for more information about including additional settling time.
    • 7 Relays are field replaceable. Refer to NI Switches Help for more information about replacing a failed relay.
    • 8 The PXI-2575 can recognize trigger pulse widths less than 150 ns if you disable digital filtering. For information about disabling digital filtering, refer to the NI Switches Help.

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