I am looking for a fast SPDT switch that is controllable using GPIB (IEEE-488). The maximum voltage applied across the switch would be something like 10V (and in practice more than around 5V). I'm quite new to electronics and am having trouble working out how various switches are controlled, and what to look for in switch specifications. Are there some general guidelines to identify a suitable switch for a particular application, and in particular what to look for in a switch controllable by GPIB?
Electronic – SPDT switch controllable by GPIB
componentsswitches
Best Answer
Since you're talking about GPIB, I'll assume you are interested in test automation. Key parameters to look at when evaluating a switch in a test automation application:
Agilent and National Instruments are the top-tier vendors for this kind of equipment, and each offers many types of switch.
You mentioned you want a "fast" switch. If you are talking about the signal frequency, you can probably find a switch capable of microwave frequencies and a (separate) GPIB interface to control it. If you are talking about the switching time, I've rarely found that the switching time of the switch itself is significant compared to the time required for GPIB communication. However if you are doing, say 6-1/2 digit voltage measurements on the switch output, you will need to be concerned about the settling time after switching -- in that case consider using one of the switch control units with a built in multimeter and look carefully at the settling time of the switches you choose.
Also, consider alternative interfaces. It's very likely that if you need less than 10 low-frequency switch channels, you could find a lower cost solution using USB control instead of GPIB. You might find an integrated USB-controlled switch or you might need to use a USB digital I/O device to control a simpler switch device.