NATIONAL INSTRUMENTS NI SCXI-1175 196 ×1 Relay Multiplexer User Manual

NATIONAL INSTRUMENTS NI SCXI-1175 196 ×1 Relay Multiplexer

Specifications

• Maximum switching power (per channel): 30 W, 37.5 VA (DC to 60 Hz)
• Maximum total current: 1 A (switching or carry)
• Maximum switching voltage:
  • Channel-to-channel: 100 V
  • Channel-to-ground: 100 V, CAT I
• Open channel isolation (50Ω termination):
  • 10 kHz: 85 dB
  • 100 kHz: 65 dB
  • 1 MHz: 48 dB
• Dynamic Characteristics:
  • Relay operate time:
  • Typical: 1 ms
  • Maximum: 3.4 ms
  • Maximum scan rate: 120 channels/s

Product Usage Instructions

Safety Precautions
Ensure all power sources are disconnected before installation or maintenance. Follow proper safety guidelines when working with high voltages.

Installation
Refer to the product manual for detailed installation instructions. Make sure to securely connect the module to the backplane following the specified guidelines.

Signal Routing
When routing signals through the SCXI High-Voltage Analog Backplane (HVAB), ensure the total current does not exceed 0.5 A.

Relay Replacement
If a relay fails, refer to the product manual for guidance on replacing the relay. Ensure the replacement relay meets the required specifications.

FAQ

• Q: Can this module be connected to signals within Categories II, III, or IV?
  A: No, this module is rated for Measurement Category I and should not be used for signals exceeding 100 V. Refer to safety guidelines for more information.

• Q: What should I do if hazardous voltages are present on relay terminals?
  A: Safety low-voltage (42.4 Vpk/60 VDC) should not be connected to any other relay terminal when hazardous voltages are present.

• Q: How do I handle high voltage transients from inductive loads?
  A: To handle high voltage transients, consider using transient suppression methods. Visit ni.com/info and enter the Info Code ‘induct’ for more information.

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NI SCXI -1175 Specifications
196 × 1 Relay Multiplexer

This document lists specifications for the NI SCXI-1175 196 × 1 multiplexer relay module. All specifications are subject to change without notice. Visit ni.com/manuals for the most current specifications.

• Topologies ……………………………….. 1-wire 196 × 1 multiplexer
• 2-wire 95 × 1 multiplexer
• 2-wire 98 × 1 multiplexer

Refer to the NI Switches Help for detailed topology and pinout information.

Input Characteristics

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

Maximum switching voltage

• Channel-to-channel ……………….. 100 V
• Channel-to-ground…………………. 100 V, CAT I

Caution This module is rated for Measurement Category I and is intended to carry signal voltages no greater than 100 V. This module can withstand up to 500 V impulse voltage. Do not use this module for connection to signals or for measurements within Categories II, III, or IV. Do not connect to MAINs supply circuits (for example, wall outlets) of 115 or 230 VAC. Refer to the Read Me First: Safety and Electromagnetic Compatibility document for more information about measurement categories.
Caution 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.
Caution Modules that can connect to a common high-voltage analog backplane derate to their lowest common voltage rating. Refer to the NI Switches Getting Started Guide for more information.
Caution The switching power is limited by the maximum switching current, the maximum voltage, and must not exceed 30 W, 37.5 VA.

Maximum switching power

• (per channel)………………………………30 W, 37.5 VA
• (DC to 60 Hz)
• DC isolation resistance………………..>1 GΩ, typical at 25 °C
• (between channel and COM terminals)
• Maximum total current………………..1 A
• (switching or carry)
• Minimum switching capacity ……….10 mV/10 μA

Note When routing signals through the SCXI High-Voltage Analog Backplane (HVAB), the maximum total current is 0.5 A.
Note Switching inductive loads (for example, motors and solenoids) can produce high voltage transients in excess of the module’s rated voltage. Without additional protection, these transients can interfere with module operation and impact relay life. For more information about transient suppression, visit ni.com/info and enter the Info Code induct.

DC path resistance
Initial

• Through front panel…………….<0.5 Ω
• Through HVAB………………….<0.8 Ω
• End-of-life…………………………….. ≥1 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 1 Ω. Load ratings apply to relays used within the specification before the end of relay life.

Differential thermal EMF

• Typical1 …………………………………3 μV
• Maximum………………………………<12 μV
• Bandwidth (–3 dB, 50 Ω termination)
• 1-wire ……………………………………>20 Mhz
• 2-wire ……………………………………>8 Mhz

Channel-to-channel isolation (50 Ω termination)

• Each relay in the NI SCXI-1175 is shared by two channels.
• Refer to Table 4 for a list of channel pairings.

1-wire channels in different relays

• 10 kHz ………………………………>90 dB
• 100 kHz …………………………….>70 dB
• 1 MHz……………………………….>50 dB

1-wire channels in the same relay

• 10 kHz ………………………………>75 dB
• 100 kHz …………………………….>55 dB
• 1 MHz……………………………….>35 dB

2-wire channels

• 10 kHz ………………………………>95 dB
• 100 kHz …………………………….>75 dB
• 1 MHz……………………………….>55 dB

Open channel isolation (50 Ω termination)

• 10 kHz…………………………………..≥85 dB
• 100 kHz…………………………………≥65 dB
• 1 MHz …………………………………..≥48 dB

Dynamic Characteristics

Relay operate time

• Typical ………………………………….1 ms
• Maximum………………………………3.4 ms

Note Certain applications may require additional time for proper settling. For information about including additional settling time, refer to the NI Switches Help.

• Maximum scan rate……………………. 120 channels/s
• Expected relay life
• Mechanical …………………………… 5 × 107 cycles
• Electrical
• 10 VDC,
• 100 mADC resistive…………… 1 × 106 cycles
• 10 VDC, 1 ADC resistive …… 5 × 105 cycles
• 30 VDC, 1 ADC resistive …… 1 × 106 cycles
• 60 VDC, 1 ADC resistive …… 1 × 105 cycles

Note The relays used in the NI SCXI-1175 are field replaceable. Refer to the NI Switches Help for information about replacing a failed relay.

Trigger Characteristics
Input trigger

• Sources ………………………………… SCXI trigger lines 0–7,
• Rear connector
• Minimum pulse width ……………. 150 ns
• Output trigger
• Destinations ………………………….. SCXI trigger lines 0–7,
• Rear connector
• Pulse width …………………………… Programmable
• (1 μs to 62 μs)

Physical Characteristics

• Relay type ………………………………… Electromechanical,
• latching
• Relay contact material ……………….. Silver, gold covered
• I/O connector ……………………………. 200 POS LFH Matrix 50,
• receptacle

SCXI power requirement

• +5 VDC ……………………………….. 50 mA
• +18.5 VDC to +25 VDC ………… 170 mA
• –18.5 VDC to –25 VDC…………. 170 mA
• Dimensions (L × W × H) ……………. 19.8 × 3.0 × 17.3 cm
• (7.8 × 1.2 × 6.7 in.)
• Weight……………………………………… 755 g (1 lb 11 oz)

1 To ensure the typical thermal EMF, power down all relays and avoid pulsing high currents near the channels you are measuring. For more information about powering down latching relays, refer to the Power Down Latching Relays After Debounce property in NI-SWITCH or the Power Down Latching Relays After Settling property in NI-DAQmx.

Environment

• Operating temperature ……………….. 0 °C to 50 °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.

Accessories
Visit ni.com for more information about the following accessories.

Table 1. NI Accessories for the NI SCXI-1175

Note When using either the
SH200LFH-4xDB50F-S or
SH200LFH-BARE WIRE cable with the
NI SCXI-1175 in the 2-wire 98 × 1 topology, CH95, CH96, and CH97 will have lower RF performance than the other 95 channels because they are not in twisted pairs in the cable. To avoid using these channels, NI-SWITCH has support for a 2-wire 95 × 1 topology that does not include CH95, CH96, and CH97.

Caution You must install mating connectors according to local safety codes and standards and according to the specifications provided by the connector manufacturer. You are responsible for verifying safety compliance of third-party connectors and their usage according to the relevant standard(s), including UL and CSA in North America and IEC and VDE in Europe.

Table 2. Third Party Accessories for the NI SCXI-1175

• Additional cover or enclosure required. See the previous safety caution.

Table 3. Third-Party Accessories for the SH200LFH-4xDB50F-S Cable

Table 4. NI SCXI-1175 Channel Pairs

Figure 1 shows the NI SCXI-1175 power-on state.

Figure 1. NI SCXI-1175 Power-On State

Compliance and Certifications

Safety
This product meets the requirements of the following standards of safety for electrical equipment 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 (IEC 61326): 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 For the standards applied to assess the EMC of this product, refer to the Online Product Certification section.

Note For EMC compliance, operate this device with shielded cables.

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 ni.com/certification, search by model number or product line, and click the appropriate link in the Certification column.

Environmental Management
National Instruments is committed to designing and manufacturing products in an environmentally responsible manner. NI recognizes that eliminating certain hazardous substances from our products is beneficial not only to the environment but also to NI customers.
For additional environmental information, refer to the NI and the Environment 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 their life cycle, all products must be sent to a WEEE recycling center. For more information about WEEE recycling centers and National Instruments WEEE initiatives, visit ni.com/environment/weee.htm.

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

National Instruments, NI, ni.com, and LabVIEW are trademarks of National Instruments Corporation. Refer to the Terms of Use section on
ni.com/legal for more information about National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patent Notice at ni.com/patents.

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References

• Test and Measurement Systems, a part of Emerson - NI
• Product Certifications - NI
• Engineering a Healthy Planet - NI
• Product Take-Back Program and Recycling - NI
• Using Info Codes - NI
• Product Documentation - NI

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