Table Of Contents

PXI-2515 Specifications

    Last Modified: April 18, 2017

    This document lists specifications for the PXI-2515 ( PXI-2515) high-speed digital signal insertion switch. The NI 2515 is intended for use with compatible single-ended NI high-speed DIO devices. Refer to the NI Switches Help for a list of supported NI high-speed DIO devices. These specifications are valid within the operating temperature range. All specifications are subject to change without notice. Visit for the most current specifications.

    The minimum software requirements are:

    • NI-SWITCH 4.0
    • NI-DAQmx 9.0



    Refer to the NI Switches Help for detailed topology information.


    The protection provided by the PXI-2515 can be impaired if it is used in a manner not described in this document.

    About These Specifications

    Maximum and minimum specifications are warranted not to exceed these values within certain operating conditions and include the effects of temperature and uncertainty unless otherwise noted.

    Typical specifications are unwarranted values that are representative of a majority (90%) of units within certain operating conditions and include the effects of temperature and uncertainty unless otherwise noted.

    Characteristic specifications are unwarranted values that are representative of an average unit operating at room temperature.

    All specifications are characteristic unless otherwise specified.

    Nominal specifications are unwarranted values that are relevant to the use of the product and convey the expected performance of the product.

    Input Characteristics

    All input characteristics are DC, ACpk, or a combination unless otherwise specified.

    Maximum switching voltage


    30 V, CAT I[1]


    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.


    The maximum switching power is limited by the maximum switching current and the maximum voltage, and must not exceed 3 W.

    Maximum switching power (per channel)

    3 W

    Maximum switching current

    0.25 A

    Maximum carry current

    0.3 A

    Typical skew


    <130 ps (across all data channels)


    <290 ps (across all data and control channels)

    Maximum DC path resistance (at 25 °C)

    Initial (CH x - DUT x)

    <2 Ω

    End-of-life (CH x - DUT x)

    ≥3 Ω

    Initial (Analog bus)

    <5 Ω

    End-of-life (Analog bus)

    ≥6 Ω


    DC path resistance typically remains low for the life of the relay. At the end of relay life, the path resistance rapidly rises above the end of life value. Load ratings apply to relays used within the specification before the end of relay life.

    Characteristic analog bus offset voltage

    <50 μV

    Characteristic analog bus leakage current

    <2 nA

    Characteristic analog bus bandwidth (3 dB, 50 Ω termination)

    50 MHz

    Characteristic crosstalk (50 Ω termination) <600 MHz

    <-10 dB

    Characteristic open channel isolation (50 Ω termination) <600 MHz

    >20 dB

    Dynamic Characteristics

    Maximum simultaneous drive limit for PXI/PXI Express

    48 relays

    Nominal relay operate time

    0.25 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.

    Nominal release time

    0.05 ms

    Nominal expected relay life, electrical (resistive)

    1 V, 10 mA

    1 × 109 cycles

    5 V, 10 mA

    1 × 108 cycles


    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 resistive 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 PXI-2515 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 type



    NI advises against installing reed relay modules directly adjacent to an embedded controller with a magnetic hard drive because of the sensitivity of reed relays and the possibility of interference from magnetic hard drives.

    Relay contact material


    I/O connectors

    2, BNC female and 2, VHDCI female

    Characteristic power requirement

    5 V

    9.1 W

    3.3 V

    0.45 W

    PXI Express

    12 V

    8.4 W

    3.3 V

    0.8 W


    The maximum power requirements depend on how many relays are closed at the same time.

    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.)


    248 g (8.7 oz)

    Estimating Reed Relay Life

    Complete the following steps to estimate relay lifetimes using the nomograph:
    1. Determine the peak voltage experienced across the relay while switching and mark this value on the Volts line.
    2. Determine the sum of the DUT, cable, and instrumentation capacitances and mark this value on the Load Capacitance line.
    3. Draw a straight line between both values. The intersection points of this line and the No Protection and 50 Ω Protection axes are the corresponding estimated relay lifetimes in cycles.

    Estimating Reed Relay Life Example

    The reed relay module is connected to a DMM through 1 meter of cable. The DMM and cable capacitances are 100 pF and 30 pF respectively. The maximum voltage switched across the relay is 50 V. Determine the estimated number of relay cycles with and without protection resistance.


    The total load capacitance is the sum of the cable and DMM capacitance, which is 130 pF. Draw a line between the 50 V point on the Volts axis and 130 pF on the Load Capacitance axis.

    The line drawn intersects the Cycles axes at approximately 500,000 on the No Protection axis and about 25,000,000 on the 50 Ω Protection axis, as shown in the following figure. This series resistance should be placed as close as possible to the relay for maximum effect.

    Figure 1. Reed Relay Lifetime Nomograph


    Operating temperature

    0 °C to 55 °C

    Storage temperature

    -40 °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:
    • 2006/95/EC; Low-Voltage Directive (safety)
    • 2004/108/EC; 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 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.

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