Table Of Contents

PXI-2796 Specifications

    Last Modified: March 3, 2017

    This document lists specifications for the PXI-2796 (PXI-2796) multiplexer module. All specifications are subject to change without notice. Visit for the most current specifications.

    About These Specifications

    Specifications characterize the warranted performance of the instrument under the stated operating conditions.

    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. The following specifications are typical at 23 °C unless otherwise specified.

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


    Dual 6 × 1 multiplexer

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


    The protection provided by the PXI-2796 can be impaired if it is used in a manner not described in this document.

    Input Characteristics

    Maximum voltage (cold-switching only)

    30 Vrms


    Do not switch 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. Refer to your RF source documentation for more information.

    Maximum carry current (per channel)

    0.6 Arms

    Maximum RF carry power (50 Ω load)

    18 W


    The switching power is limited by the maximum switching current and the maximum voltage. Channel to common switching power must not exceed 18 W.


    National Instruments recommends against switching RF signals below -35 dBm with this device.

    RF Performance Characteristics

    Characteristic impedance (Z0)

    50 Ω nominal

    Insertion loss

    ≤3 GHz

    <0.2 dB

    ≤8 GHz

    <0.3 dB

    ≤12.4 GHz

    <0.4 dB

    ≤18 GHz

    <0.5 dB

    ≤26.5 GHz

    <0.7 dB

    ≤40 GHz

    <1.1 dB

    Voltage standing wave ratio (VSWR)

    ≤3 GHz


    ≤8 GHz


    ≤12.4 GHz


    ≤18 GHz


    ≤26.5 GHz


    ≤40 GHz


    Open channel isolation

    ≤3 GHz

    >80 dB

    ≤8 GHz

    >70 dB

    ≤12.4 GHz

    >60 dB

    ≤18 GHz

    >60 dB

    ≤26.5 GHz

    >55 dB

    ≤40 GHz

    >45 dB

    RF carry power

    ≤18 GHz

    18 W

    ≤26.5 GHz

    15 W

    ≤40 GHz

    5 W

    Refer to the following figure for the typical insertion loss of the PXI-2796.

    Figure 1. Typical Insertion Loss

    Refer to the following figure for the typical isolation of the PXI-2796.

    Figure 2. Typical Isolation

    Refer to the following figure for the typical VSWR of the PXI-2796.

    Figure 3. Typical VSWR

    Dynamic Characteristics

    Relay operate/release time

    15 ms


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

    Recommended cycle speed

    5 channels/s

    Expected mechanical relay life

    2 × 106 cycles

    Insertion loss repeatability

    <0.03 dB (typical)

    Trigger Characteristics

    Input trigger


    PXI trigger lines <0...7>

    Minimum pulse width

    150 ns


    The PXI-2796 can recognize trigger pulse widths less than 150 ns if you disable digital filtering. Refer to the NI Switches Help at for information about disabling digital filtering.

    Output trigger


    PXI trigger lines <0...7>

    Pulse width

    Programmable (1 µs to 62 µs)

    Physical Characteristics

    Relay manufacturer/PN

    Radiall/R592 series

    Relay type

    Electromechanical, non-latching

    Contact material

    Beryllium copper, gold-plated

    I/O connector

    14 SMA 2.9 jacks

    SMA torque

    0.8 N · m to 1.1 N · m (7 in. · lbs to 10 in. · lbs)

    PXI power requirement

    2.5 W at 3.3 V

    1 W at 5 V

    6 W at 12 V

    Dimensions (L × W × H)

    3U, two slots, PXI/cPCI module 21.6 cm × 4.1 cm × 13.0 cm (8.5 in. × 1.6 in. × 5.1 in.)


    378 g (13.25 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
    • 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

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