Table Of Contents

PXIe-2739 Specifications

    Last Modified: May 3, 2017

    This document lists specifications for the PXIe-2739. All specifications are subject to change without notice.

    PXIe-2739 Specifications

    This document lists specifications for the PXIe-2739 matrix relay card.

    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-2739 can be impaired if it is used in a manner not described in this document.


    Refer to the NI Switches Help at for detailed topology information.


    2-wire 16 × 16 matrix

    Input Characteristics

    Maximum switching voltage


    100 V


    100 V, CAT O


    This module is rated for Measurement Category I. It is intended to carry signal voltages no greater than 70 Vrms, 100 Vpk, or 100 VDC. 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 VAC or 230 VAC.

    Measurement Categories CAT I and CAT O (Other) are equivalent and are for measurements performed on circuits not directly connected to the electrical distribution system referred to as MAINS voltage. This category is for measurement of voltages from specially protected secondary circuits. Such voltage measurements include signal levels, special hardware, limited-energy parts of hardware, circuits powered by regulated low-voltage sources, and electronics.


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

    Maximum switching power

    60 W, 62.5 VA


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

    Maximum current


    2 A (per channel)


    2 A (per channel)

    Minimum switching load

    20 mV/1 mA


    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.

    DC isolation resistance (channel-to-COM)

    1 GΩ (typical at 25º C)

    DC path resistance


    <1.3 Ω


    ≥2.3 Ω

    Path resistance is a combination of relay contact resistance and trace resistance. Measure path resistance by combining resistance of the high and low signal paths from one row to one column. Contact resistance typically remains low for the life of a relay. At the end of relay life, the contact resistance rises rapidly above ≥2.3 Ω.

    Thermal EMF

    <10 µV

    RF Performance Characteristics

    Bandwidth (-3 dB, typical at 23º C)

    1-wire 50 Ω termination

    ≤ 10 MHz

    2-wire 100 Ω termination

    ≤ 10 MHz

    Open channel isolation (typical at 23º C) 50 Ω termination

    10 kHz

    ≥ 77 dB

    100 kHz

    ≥ 62 dB

    1 MHz

    ≥ 42 dB

    Channel-to-channel crosstalk (typical at 23º C, 50 Ω termination )

    10 kHz

    ≤ -70 dB

    100 kHz

    ≤ -52 dB

    1 MHz

    ≤ -32 dB

    Dynamic Characteristics

    Relay Operate Time


    1 ms


    3.3 ms

    Simultaneous drive limit

    90 relays

    Expected mechanical relay life

    1 × 108 cycles

    Expected electrical relay life

    ≤30 mV, ≤10 mA resistive

    2.5 × 106 cycles

    30 V, 1 A

    5 × 105 cycles

    30 V, 2 A

    1 × 105 cycles

    60 VDC, 1 ADC resistive

    1 × 105 cycles


    Relays are field replaceable. Refer to the NI Switches Help at for more information about replacing a failed relay.


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

    Physical Characteristics

    Relay type

    Electromechanical, non-latching

    Relay contact material

    Palladium-ruthenium, gold covered

    Front panel connector

    160 DIN 41612, 160 positions, male

    Power requirement
    PXI Express

    12 V

    24 W

    3.3 V

    3.6 W

    Dimensions (L × W × H)

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


    423 g (14.9 oz)


    Maximum altitude

    2,000 m (800 mbar) (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. Meets MIL-PRF-28800F Class 3 low temperature limit and MIL-PRF-28800F Class 2 high temperature limit.)

    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. Meets MIL-PRF-28800F Class 3 limits.)

    Relative humidity range

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

    Shock and Vibration

    Operating shock

    30 g peak, half-sine, 11 ms pulse (Tested in accordance with IEC 60068-2-27. Meets MIL-PRF-28800F Class 2 limits.)

    Random vibration


    5 Hz to 500 Hz, 0.3 grms (Tested in accordance with IEC 60068-2-64.)


    5 Hz to 500 Hz, 2.4 grms (Tested in accordance with IEC 60068-2-64. Test profile exceeds the requirements of MIL-PRF-28800F, Class 3.)

    Derating PXIe-2739 Load at >40 °C

    To verify you are operating the PXIe-2739 within supported 2-wire derating conditions, complete the following steps:
    1. Use the following equation to calculate the load: Load = Channels 1 × ( Current 1 ) 2 + Channels 2 × ( Current 2 ) 2 + ... + Channels n × ( Current n ) 2 where Channels is the number of channels that simultaneously carry a signal, Current, for 1, ... , n.
    2. Verify that the load at your ambient operating temperature falls within the shaded region of the following figure.
      Figure 1. PXIe-2739 Load Derating, 2-Wire

    Module Load Derating at >40 °C

    The following examples calculate supported derating conditions for the PXIe-2739.

    Example 1
    ( 3 × 2 2 ) + ( 4 × 1.7 2 ) = 23.6 A 2 × channels
    where 3 channels carry 2 A
      4 channels carry 1.7 A

    You can use this module at ambient temperatures between 0 °C and 55 °C.

    Example 2
    ( 8 × 2 2 ) = 32 A 2 × channels
    where 8 channels carry 2 A

    You can use this module at ambient temperatures between 0 °C and 50 °C.

    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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