Table Of Contents

PXI-2566 Specifications

    Last Modified: December 13, 2017


    The protection provided by the PXI-2566 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.



    16-SPDT (nonlatching)




    This module is rated for Measurement Category I and intended to carry signal voltages no greater than 150 V. This module can withstand up to 800 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 V AC.


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


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

    Maximum switching voltage[1]


    150 V DC, 125 V AC


    150 V DC, 125 V AC, CAT I[2]

    Maximum switching power (per channel)

    60 W, 62.5 VA (DC to 60 Hz)

    Maximum switching current (per channel)

    2 A DC, 2 A AC

    Simultaneous channels at maximum switching current (≤25 °C)


    Maximum carry current (per channel)

    5 A DC, 5 A AC

    Simultaneous channels at maximum carry current (≤25 °C)


    Module Load Derating at >25 °C

    Load derating is dependent on the ambient temperature and the sum of the current squared of each channel simultaneously carrying a signal. The result must fall within the shaded region of the following figure. The following examples represent this calculation:

    Example 1: Five channels carry 4 A while ten channels carry 2 A.

    (5 × 42) + (10 × 22) = 120 A2 × channels

    Example 1 can be used at ambient temperatures between 0 °C and 50 °C.

    Example 2: Six channels carry 5 A while ten channels carry 2 A.

    (6 × 52) + (10 × 22) = 190 A2 × channels

    Example 2 can be used at ambient temperatures between 0 °C and 41 °C.

    Figure 1. Module Load Derating
    DC path resistance[3]


    <0.1 Ω, warranted

    Initial, with TB-2666[4]

    <0.19 Ω, warranted

    End of life

    ≥1.0 Ω

    DC isolation

    Open channel, with TB-2666[4]

    100 GΩ, typical

    Channel-to-channel, with TB-2666[4]

    100 GΩ, typical

    Thermal EMF

    <13 μV, typical

    Minimum switching capacity

    10 μA at 10 mV DC

    Bandwidth (-3 dB, 50 Ω system)

    ≥70 MHz, typical

    Bandwidth with TB-2666 (-3 dB, 50 Ω system)[4]

    ≥10 MHz, typical

    Crosstalk (50 Ω system)

    10 kHz

    -75 dB, typical

    100 kHz

    -65 dB, typical

    1 MHz

    -45 dB, typical


    Relay operate time[5]

    2 ms, typical

    4.4 ms, maximum

    Maximum cycle speed

    115 cycles/s

    Expected relay life[6]


    1 × 108 cycles


    30 V DC, 1 ADC resistive

    5 × 105 cycles

    30 V DC, 2 ADC resistive

    1 × 105 cycles

    125 V AC, 0.2 AAC resistive

    3 × 105 cycles

    125 V AC, 0.5 AAC resistive

    1 × 105 cycles


    Input trigger


    PXI trigger lines <0...7>

    Minimum pulse width[7]

    150 ns

    Front panel/terminal block input voltage

    -0.5 V, minimum

    +0.7 V, VL maximum

    +2.0 V, VH minimum

    +3.3 V, nominal

    +5.5 V, maximum

    Output trigger


    PXI trigger lines <0...7>

    Pulse width

    Software-selectable: 1 μs to 62 μs

    Front panel voltage

    3.3 V TTL, 8 mA, nominal


    Relay type

    Electromechanical, nonlatching

    Relay contact material

    Gold-clad silver alloy

    I/O connector

    62-pin D-SUB connector, male

    PXI power requirement

    4.5 W at 5 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.)


    250 g (9 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 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, 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

    • 1 Switching inductive loads (for example, motors and solenoids) can produce high-voltage transients in excess of the rated voltage of the module. 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 induct.
    • 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 DC path resistance typically remains low for the life of the relay. At the end of relay life, the path resistance rapidly rises above 1 Ω. Load ratings apply to relays used within the specification before the end of relay life.
    • 4 Specifications including the TB-2666 accessory are characterized from screw terminal to screw terminal for the applicable path or paths.
    • 5 Certain applications may require additional time for proper settling. Refer to the NI Switches Help for information about including additional settling time.
    • 6 The relays used in the PXI-2566 are field replaceable. Refer to the NI Switches Help document for information about replacing a failed relay.
    • 7 The PXI-2566 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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