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.
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.
Number of channels |
10 |
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Maximum current |
0.3 A (per channel) |
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Maximum power |
0.25 W (per channel) |
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Resistor accuracy |
0.5% |
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TCR |
100 ppm |
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Resolution |
1 Ω steps |
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Range |
1 Ω to 255 Ω (per channel) |
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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 |
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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.
Simultaneous drive limit |
89 relays |
Relay operate/release time |
250 μs |
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.
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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.
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.
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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.
Relay type |
Reed |
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) |
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.
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.) |
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This product is designed to meet the requirements of the following electrical equipment safety standards for measurement, control, and laboratory use:
For UL and other safety certifications, refer to the product label or the Online Product Certification section.
For EMC declarations and certifications, refer to the Online Product Certification section.
This product meets the essential requirements of applicable European Directives, as follows:
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.
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.
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.