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PXI-2720 Specifications

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    Last Modified: April 14, 2017

    This document lists specifications for the PXI-2720 (PXI-2720) 8-bit resistor module. All specifications are subject to change without notice. Visit ni.com/manuals 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.

    Topology

    Independent

    Refer to the NI Switches Help at ni.com/manuals for detailed topology information.

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    Caution  

    The protection provided by the PXI-2720 can be impaired if it is used in a manner not described in this document.

    Input Characteristics

    Number of channels

    10
    Maximum voltage

    Channel-to-channel

    60 VDC, 30 VACrms, CAT I[1]

    Channel-to-ground

    60 VDC, 30 VACrms, CAT I[1]

    Maximum current

    0.3 A (per channel)

    Maximum power

    0.25 W (per channel)

    Resistor accuracy

    0.5%

    TCR

    100 ppm

    Resolution

    1 Ω steps

    Range

    1 Ω to 255 Ω (per channel)
    Typical channel accuracy

    Channel set between 20 Ω and 64 Ω

    <5.0%

    Channel set between 64 Ω and 255 Ω

    <2.0%

    Channel accuracy is a function of the overall resistor accuracy, plus relay and trace path resistance, plus any effects of temperature.

    Typical minimum resistance

    1 Ω
    Typical DC offset resistance (per channel)

    Initial

    <1 Ω

    End-of-life

    ≥3 Ω

    Channel resistance is a combination of relay contact resistance, trace resistance, and resistor value. Contact resistance typically remains low for the life of a relay. At the end of relay life, the offset resistance may rapidly rise above 3 Ω.

    The following figures show the expected resistance error and the expected resistance.

    Figure 1. Expected resistance error between 0 Ω and 255 Ω
    Figure 2. Expected resistance between 0 Ω and 255 Ω

    Dynamic Characteristics

    Simultaneous drive limit

    89 relays

    Relay operate/release time

    250 μs
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    Note  

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

    Typical relay life

    Low power load (<50 mW)

    1 × 108 cycles

    Full power load (<250 mW)

    1 × 106 cycles

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    Note  

    Reed relays are highly susceptible to damage caused by switching capacitive and inductive loads. Capacitive loads can cause high inrush currents, whereas 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 ni.com/info and enter the Info Code relaylifetime. For information about inductive loads, enter the Info Code relayflyback.

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    Note  

    The relays used in the PXI-2720 are field replaceable. Refer to the NI Switches Help at ni.com/manuals for information about replacing a failed relay.

    Trigger Characteristics

    Input trigger

    Sources

    PXI trigger lines <0...7>

    Minimum pulse width

    150 ns
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    Note  

    The PXI-2720 can recognize trigger pulse widths that are less than 150 ns by disabling digital filtering. For information about disabling digital filtering, refer to the NI Switches Help at ni.com/manuals.

    Physical Characteristics

    Relay type

    Reed
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    Note  

    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.

    Front panel connector

    37-pin D-SUB connector

    DMM port

    2 × 2 Micro-Fit connector

    Power requirement

    1.2 W at 3.3 V

    11 W maximum at 5 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.)

    Weight

    266 g (9.3 oz)

    Environment

    Operating temperature

    0 °C to 55 °C

    Storage temperature

    -20 °C to 70 °C

    Relative humidity

    5% to 85%, noncondensing

    Pollution Degree

    2

    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

    Operating

    5 Hz to 500 Hz, 0.3 grms

    Nonoperating

    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

    Safety

    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
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    Note  

    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
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    Note  

    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.

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    Note  

    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.

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    Note  

    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 ni.com/certification, 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 ni.com/environment. 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)
    spd-note-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 ni.com/environment/weee.

    电子信息产品污染控制管理办法（中国RoHS）
    spd-note-china-rohs
    中国客户  

    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 ni.com/environment/rohs_china。(For information about China RoHS compliance, go to ni.com/environment/rohs_china.)

    • 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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