GPIB Switches Specifications on GlobalSpec

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GPIB Protocol Compatibility


	GPIB Protocol Compatibility:
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	IEEE 488.1		Devices are compatible with ANSI/IEEE Standard 488-1975, more commonly known as IEEE 488.1. This standard defines the mechanical, electrical, and protocol specifications for the interconnection of programmable instruments. IEEE 488.1 also specifies that a GPIB network supports a maximum of 14 devices on the bus and a maximum data transfer rate of 1-MBps.
	IEEE 488.2		Devices are compatible with IEEE 488.2, an enhanced version of the original IEEE 488.1 Standard. Because IEEE 488.1 did not specify issues such as how data should be formatted, how the status of the bus should be reported, and how messages should be exchanged, Tektronix proposed a set of standard formats that became the basis of IEEE 488.2. Specifically, IEEE 488.2 standardizes data formats, status reporting, error handling, and controller commands.
	HS488		High Speed 488 (HS488) is a newer, faster protocol developed by National Instruments that accelerates data transfer rates up to 8-MBps using standard GPIB cables. HS488 is a superset of the original IEEE 488.1 standard implemented at the hardware level by an application-specific integrated circuit (ASIC).
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General Switch Specifications


	Switch Topology:		There are three main types of functional topologies for switches: General-purpose Multiplexers Matrix
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	General Purpose		General-purpose devices are simple switches that consist of independent and isolated relays or field-effect transistor (FET) switches. They can connect one input to one output.
	Multiplexer		Multiplexers connect one input to several outputs, or several inputs to one output.
	Matrix		Matrix switches have several inputs and several outputs. Any number of inputs can be connected to any number of outputs.
	Other		Other combinations such multiplexer/matrix, a switch arrangement that can be connected as a multiplexer or as a matrix.
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	Switch Type:
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	Relay Switch		The switch has a mechanical relay to rout or switch signals. It is used to switch or scan high voltage signals. There are three types of products: armature, dry-reed, and mercury-wetted switches. The relay type can be SPST (single-pole or 1-wire, single-throw), SPDT (single-pole or 1-wire, double-throw), or DPDT (double-pole or 2-wire, double-throw).
	Solid State Switch		Solid-state switches use transistors (FETs and others) to route or switch signals. They are used in applications that require high-speed scanning of low-level signals (±10 V). Because they do not have any moving parts, solid-state switches have a very long life.
	RF Switch		RF switches are ideal for routing high-frequency signals.
	Other		Other unlisted switch types such as optical switches.
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	Relay Type:		The type of the mechanical relays of the switch.
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	SPST		The relay type is single-pole, single-throw (SPST). There are two types of SPST relays: Form A (normally-open) and Form B (normally-closed).
	SPDT		The relay type is single-pole, double-throw (SPDT). This contact type is also known as a Form C.
	DPDT		Double-pole, double-throw (DPDT).
	FETs		The switch is a solid-state device and the relay is a field-effect transistor (FET).
	Other		Other types of relays.
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Configuration


	Number of Input Channels		The number of input channels, or the number of GPIB controllers that the switch can handle.
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	Number of Output Channels		The number of output channels, or the number of GPIB buses controlled by the switch.
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Electrical Specifications


	Maximum AC Switchable Voltage		The maximum AC voltage (signals) that the device can switch. Generally this voltage is expressed in root mean square (RMS) values.
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	Maximum DC Switchable Voltage		The maximum DC voltage (signals) that the device can switch.
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	Maximum AC Switchable Current		The maximum AC current that the device can switch and still achieve full-rated life
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	Maximum DC Switchable Current		The maximum DC current that the device can switch.
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	Maximum Real Switchable Power per Channel:		The maximum power in watts that the device can switch.
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	Maximum Reactive Switchable Power per Channel:		The maximum signal power in VA (Volt-Ampere) that the device can switch.
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	Bandwidth		The maximum frequency of the signal that can be switched without degrading the signal's quality. Normally, a device can switch signals with frequencies ranging from DC to this maximum specified frequency.
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Other Features


	Signal Propagation Delay		Signal propagation delay is the speed degradation (time delay) that occurs when a signal is transferred between GPIB networks via an expander.
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	External Indicators?		Devices include external indicators (normally LEDs) for states such as Talk, Listen, Receive, Send, Power, Ready, etc.
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	CE / FCC Certified?		Devices meet requirements of the European Union's CE Marking system and/or the U.S. Federal Communications Commission (FCC).
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