National Instruments PXI-2568

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DEVICE SPECIFICATIONS

NI PXI-2568

31-Channel SPST Relay Module

This document lists specifications for the NI PXI-2568 (PXI-2568) general-purpose relay

module. All specifications are subject to change without notice. Visit ni.com/manuals for the

most current specifications.

Contents

About These Specifications...................................................................................................... 1

Input Characteristics......................................................................................................... 2

Dynamic Characteristics................................................................................................... 3

Trigger Characteristics...................................................................................................... 4

Physical Characteristics.................................................................................................... 4

Environment......................................................................................................................4

Shock and Vibration..........................................................................................................5

Compliance and Certifications..........................................................................................5

Diagrams................................................................................................................................... 7

Accessories................................................................................................................................8

About These Specifications

Specifications characterize the warranted performance of the instrument under the stated

operating conditions. Data in this document are Specifications unless otherwise noted.

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.

All voltages are specified in DC, AC

, or a combination unless otherwise specified.

Topology 31-SPST (form A, latching), 15-DPST

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

Caution The protection provided by the PXI-2568 can be impaired if it is used in a

manner not described in this document.

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The NI PXI-2568 is a 31-channel SPST (Single-Pole, Single-Throw) relay module designed for general-purpose switching applications within the PXI/cPCI platform. It features latching electromechanical relays, making it suitable for applications requiring sustained contact closure without continuous power. The module is rated for Measurement Category I, indicating its suitability for carrying signal voltages up to 100 Vrms, 150 Vpk, or 150 VDC, and can withstand impulse voltages up to 800 V.

Key Technical Specifications:

Topology: 31-SPST (form A, latching), 15-DPST.
Maximum Switching Voltage: 150 V (channel-to-channel and channel-to-ground).
Maximum Switching Power (per channel): 60 W, 62.5 VA (DC to 60 Hz).
Maximum Current (switching or carry, per channel): 2 A.
Simultaneous Channels at Maximum Current (≤55 °C): 31.
Minimum Switch Load: 20 mV/10 mA.
DC Path Resistance:
- Initial: <0.15 Ω.
- End of life: >1.0 Ω.
Thermal EMF: ≤12 µV, typical.
Bandwidth (-3 dB, 50 Ω termination): ≥40 MHz, typical.
Crosstalk (50 Ω termination, channel-to-channel):
- 10 kHz: ≤-85 dB, typical.
- 100 kHz: ≤-70 dB, typical.
- 1 MHz: ≤-50 dB, typical.
- 10 MHz: ≤-30 dB, typical.
Isolation (50 Ω termination, open channel):
- 10 kHz: ≥85 dB, typical.
- 100 kHz: ≥65 dB, typical.
- 1 MHz: ≥45 dB, typical.
- 10 MHz: ≥25 dB, typical.
Maximum Cycle Speed: 145 cycles/s.
Relay Operate Time: 1 ms (typical), 3.4 ms (maximum).
Input Trigger Sources: PXI trigger lines <0...7>.
Minimum Input Trigger Pulse Width: 150 ns (can be less if digital filtering is disabled).
Output Trigger Destinations: PXI trigger lines <0...7>.
Output Trigger Pulse Width: Programmable (1 µs to 62 µs).
Relay Type: Electromechanical, latching.
Relay Contact Material: Palladium-ruthenium, gold covered.
I/O Connector: 62-pin D-SUB, male.
PXI Power Requirement: 6 W at 5 V, 2.5 W at 3.3 V.
Dimensions (L × W × H): 3U, one slot, PXI/cPCI module, 21.6 cm x 2.0 cm × 13.0 cm (8.5 in. × 0.8 in. × 5.1 in.).
Weight: 227 g (8 oz).
Operating Environment:
- Ambient Temperature Range: 0 °C to 55 °C.
- Relative Humidity Range: 10% to 90%, noncondensing.
- Maximum Altitude: 2,000 m (at 25 °C ambient temperature).
- Pollution Degree: 2.
Storage Environment:
- Ambient Temperature Range: -20 °C to 70 °C.
- Relative Humidity Range: 5% to 95%, noncondensing.
Operational Shock: 30 g peak, half-sine, 11 ms pulse.
Random Vibration:
- Operating: 5 Hz to 500 Hz, 0.31 grms.
- Nonoperating: 5 Hz to 500 Hz, 2.46 grms.

Usage Features:

PXI/cPCI Compatibility: Designed as a 3U, single-slot module, ensuring seamless integration into PXI and cPCI chassis.
Triggering Capabilities: Supports both input and output triggering via PXI trigger lines, offering flexible synchronization with other instruments in a test system. The output trigger pulse width is programmable, allowing for fine-tuned control.
Hazardous Voltage Handling: The module is designed to carry signal voltages up to 150 V, but users must exercise caution when hazardous voltages (>42.4 Vpk/60 V DC) are present on any channel, as safety low-voltage cannot be connected to other channels. It is not intended for direct connection to MAINS supply circuits.
Inductive Load Switching: A note advises on potential high voltage transients when switching inductive loads and recommends transient suppression for optimal module operation and relay life.
Digital Filtering: The manual mentions the ability to disable digital filtering for input triggers, which can allow the recognition of trigger pulse widths less than 150 ns.
Topology Information: Detailed topology information is available in the NI Switches Help, which is crucial for understanding specific connection requirements and configurations.

Maintenance Features:

Expected Relay Life:
- Mechanical: 1 × 10^8 cycles.
- Electrical (resistive loads):
  - 10 VDC, 100 mADC: 2.5 × 10^6 cycles.
  - 10 VDC, 1 ADC: 1 × 10^6 cycles.
  - 30 VDC, 1 ADC: 5 × 10^5 cycles.
  - 30 VDC, 2 ADC: 1 × 10^5 cycles.
Field Replaceable Relays: The relays are designed to be field replaceable, allowing for easier maintenance and extended module lifespan. Instructions for relay replacement are provided in the NI Switches Help.
DC Path Resistance Monitoring: The DC path resistance typically remains low but rises rapidly above 1 Ω at the end of relay life, serving as an indicator for relay degradation.
Documentation and Support: The manual emphasizes referring to the NI Switches Help and ni.com/manuals for the most current specifications, detailed topology information, settling time considerations, and instructions for replacing failed relays.
Compliance and Certifications: The device is designed to meet various safety (IEC 61010-1, EN 61010-1, UL 61010-1, CSA 61010-1) and EMC standards (EN 61326-1, EN 55011, AS/NZS CISPR 11, FCC 47 CFR Part 15B, ICES-001), ensuring its reliability and adherence to international regulatory requirements. Online product certification information is available for further details.
Environmental Management: NI's commitment to environmentally responsible design and manufacturing is highlighted, with information on hazardous substance elimination and compliance with environmental regulations available on ni.com/environment.
WEEE and RoHS Compliance: The product is compliant with Waste Electrical and Electronic Equipment (WEEE) directives for EU customers and the Chinese RoHS regulations, with specific instructions for disposal and compliance information provided.