Switches
Switch Introduction
To meet the needs of a wide range of uses in the measurement and automation field, switches come in a variety of types and sizes for versatile
applications. It is important to understand the different types of switches available before selecting the most appropriate switch configuration.
General-Purpose (GP) Switches
General purpose switches contain several independent relays which are isolated from each other. GP
switches are commonly used to connect one input to one output and are usually built with Form A
or Form C relays. The normal usage of GP switches is to turn on or turn off devices, such as motors,
fans, heaters, and lights.
Multiplexers (MUX)
In test applications, the quantity of instruments is usually lower due to high cost. Thus, to connect
multiple units under test (UUT) with the testing instrument, a multiplexer is always the choice to
make the maximum utilization of the instruments. A 1-wire multiplexer routes single-ended signals
to one point, and a 2-wire multiplexer selects differential signals. A 4-wire multiplexer is usually used
to measure low resistance or RTDs. The instruments which are often used with multiplexer include
DMM, digitizer and signal source, such as AWG, to provide both measurement and excitation.
Matrix
Matrix switches provide the most versatile switching capacity among these function topologies. In
the matrix, any input can connect to any output individually or in combination. Unlike the multiplexer,
the matrix can connect the source or measurement instrument to multiple UUTs at the same time.
Matrix' advantage is the save of wiring. When users want to change the configurations of measure-
ment or excitation, users just change the internal connection path, and do not have to manually
reconfigure the wiring.
PXI-7901
16-CH General-Purpose SPDT Relay Module
■ꢀSupported Operating System
•ꢀWindows 2000/XP
■ꢀDriver and SDK
•ꢀLabVIEW, MATLAB, Visual Studio, Visual Studio.NET
■ꢀSoftware Utility
•ꢀADL-SWITCH for Windows
General Specifications
ꢀ
■
I/O Connector: 62-pin D-sub male
■
■
■
■
■
Operating temperature: 0˚C to 55˚C (32˚F to 131˚F)
Storage temperature: -20˚C to 70˚C (-4˚F to 158˚F)
Relative humidity: 5% to 85% non-condensing
Power requirements: (when all relays are ON)
Dimensions (not including connectors)
ꢀ
ꢀ
· 160 mm x 100 mm (6.24” x 3.9”)
Specifications
Certifications
Relay Characteristics
■
EMC/EMI: CE, FCC Class A
■
Number of channels: 16
Relay type: SPDT (1 Form C), non-latching
■
Ordering Information
■
Switching capacity
Features
· Max. switching current: 3 A
■ PXI-7901
■
PXI specifications Rev. 2.2 compliant
· Max. switching voltage: 220 VDC, 250 VAC
· Max. switching power: 50 VA, 60 W
· Max. carrying current: 3 A
16-CH General-Purpose SPDT Relay Module
■
16-CH SPDT (1 Form C) non-latching relays
* Failure rate indicates the lower limit of switching capacity of a
relay contact at a reliability level of 60%
■
Switching capacity: 3 A switching, 3 A carrying / 220 VDC,
■
Contact resistance: 150 mΩ max.
250 VAC
■
125 operations per second for full settling
Auxiliary Digital I/O
Terminal Boards & Cables
■
Onboard 1 k-sample scan list for deterministic scanning
■
Numbers of channel: 8 inputs/outputs
Compatibility: 3.3 V/TTL (5 V tolerant)
■
■ TB-6201-01
General-Purpose Switch Terminal Board with one
62-Pin D-Sub Female Connector for PXI-7901
■
Handshaking signals for external instruments synchronization
■
Hardware emergency shutdown with programmable relay
Safety Functions
safety status
■
Emergency shutdown
■ ACL-10262
62-pin D-sub male/female cable, 1 M
■
8 auxiliary 3.3 V/TTL digital inputs/outputs with 5 V tolerance
· Logic level: 3.3 V/TTL (5 V tolerant)
· Active: logic low
(For more information about mating cables, please refer to
P3-48.)
2-23
Updated September 23, 2014. ©2014 ADLINK Technology, Inc. All Rights Reserved. All specifications are subject to change without further notice.
www.adlinktech.com
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