Signametrics SM4020, SM4022, SM4040, and SM4042 PCI Relay Multiplexers Data Sheet

The Signametrics SM4020/22/40/42 models offer a superior functionality and performance, at unmatched prices. These flexible relay switching modules are designed for applications requiring both, performance and ease of use. They can be reconfigured on-the-fly for 40:1 differential multiplexing, 20 channels 4-Wire multiplexers or any one of several pre-set configurations. They can also be set to a universal mode, in which each relay can be independently controlled.

In measurement applications, it is important to consider the error contribution of the switching subsystem. Using the wrong switch may result in errors several orders of magnitude greater than that of the measurement instrument. While the carefully designed Instrumentation Quality SM4022 and SM4042 models will have negligible signal degradation, even the low cost 4020 and 4040 models will perform 10 times better than most other PCI plug-in switches.

Built-in intelligence relives the host CPU, and facilitate for high level commands, making programming much simpler and faster. For instance, to multiplex a set of 4-Wire resistors, issue a configuration command to set it as a 4-Wire mux, followed by a sequence of commands to select various channels. All currently closed channel relays will open and the selected two channel relays corresponding to the4-Wire connection will close. This is done within a single actuation time, and with a high level command, resulting in simple test procedure. It is possible to efficiently mix configurations, without sacrificing channels. Also, the number of channels per system is unlimited.

For Thermocouple (TC) multiplexing use the optional SM40T Isothermal-block. The SM40T has an active temperature sensor to reading cold junction temperature. The low thermal EMF of the 4022 and 4042 minimizes temperature error. Digital Multimeters such as the 2060 and 2064 from Signametrics have built-in Thermocouple linearization for most popular TC types.

As with the Signametrics DMMs, these units carry a 30 day no-risk trial period.

The software package included is complete, and does not require any additional drivers or packages. It is not in Signametrics interest to constrain users to a short list of S/W packages. Therefore the type of driver provided is universal. It allows these Switches to be controlled by a large number of software environments, including MS Word, Excel, Mat Lab, Visual Basic, C, C++, C#, LabWindows, LabView, ATEasy, Delphi and may other graphical and text based software packages. An added benefit of having no dependencies makes for a fast and easy installation and operation. In less than five minutes you will be controlling these switches.