PXI-2720 Specifications

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.

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)

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.

Dynamic Characteristics

Simultaneous drive limit

89 relays

Relay operate/release time

250 μs

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

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.
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

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

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
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
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.
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.
Note For EMC declarations and certifications, refer to the Online Product Certification section.

CE Compliance 1378

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)
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）
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.