Signal Recovery- Multiplexer (Model:3830)

Overview

The Model 3830 Mulitplexer (mux makes it easy to implement computer-selected interconnections between different instruments.  Six floating BNc connectors can be used as either inputs or ouptuts and are coupled to one of two common buses vis DPST reed-relay switches.  This ensures that both inner and outer parts of the connector are isolated when the relevant relay is not energized. The two buses can also be connected together via a seventh "bridge" reed relay, allowoing operation either as two, two-input, one-output muxes or as a five-input, one-input mux.  Other configurations are of course possible.

The unit is powered and controlled directly from the PC's USB port, so requires no additional power source.  Operation is entirely via software, with no manual switches or settings on the module.

The supplied instrument control software consists of two layers.  At the upper level, a simple Windows dialog application, "SR3830 Multiplexer", offers a convenient panel that allows switching patterns, known as "states", to be set up graphically and combined into "configuration" files.

Easy to use SR3830 Multiplexer applications software

Configuration files can be saved to and recalled from disk.  Using these files make replication of experiments very straightforward.

Two main modes of operation are therefore possible.  Users who simply want to operate the mulitplexer "out of the box" need do no more than plug it in, install the driver and software, and then use the SR3830 Multiplexer software to control. it.

Alternatively, when the mulitplexer is to be used as part of a computer controlled test system, then the user can develop software to control it via the SR3830Comms ActiveX control.  The control eliminates the need for user to write the low-level code needed to send commands to and receive responses from the multiplexer, allowing them to concentrate on developing the higher level program to run their experiments.  Typical applications include:

• Switching one of several sensor outputs to the input of a measuring instrument, wuch as a voltmeter or oscilloscope
• Connecting a signal source, such as an oscillator, to one of several actuators or drive cells
•  Test and measurement systems implement in LabVIEW where a SIGNAL RECOVERY multiplexer needs to be controlled at the same time as instruments from different suppliers.
• Measurement system using scripted web pages (HTML files) operated via Internet Explorer.

The SR3830Comms control can of course also be used at the same time as other SIGNAL RECOVERY software ActiveX controls, such as SRInstComms, allowing sophisticated systems to be assembled.  For example, a group of five photodiodes can be connected to the current preamplifier input of a model 7270 DSP lock-in amplifier via the model 3830 and then, using both controls a user-developed application program coud sequentially measure the signal on each photodiode.

Both the top level SR3830 Multiplexer software and the lower-level SR3830Comms ActiveX control include comprehensive on-screen help files, while examples of how to use the control in Lab VIEW, Visual Basic, VBScript, Visual C++, and Excel are also supplied.  Also included is an instruction manual in both printed and PDF formats.

Specifications

General Six way input/output multiplexer offering isolated switching via reed relays.  Power and control via USB and supplied software.  ActiveX control included. Inputs/Outputs    Connectors    Switches    Max Voltage BNC, no internal load Reed relay, DPST 50 v between bNC inners and outers and from BNC to ground Max Current 200 mA Contact Resistance < 0.15Ω Switching    Six DPST relays connect A, B, C to bus 1 and D, E, F to bus 2.  Seventh "bridge" relay    connects bus 1 to bus 2 Indicators LED indicates when corresponding relay is energized USB Connector Rear-panel, female USB connector for connection to the PC or a USB hub. General Power Requirements    Voltage <500 mA @ +5 V DC, supplied via USB Dimensions    Width    Depth    Height Weight 5½" (134 mm) 4½" (114 mm) 1¼" (32 mm) 9.9 oz (280 g) Software A full applications package for Windows XP/Vista (32-bit versions) allowing any switching combination to be set up graphically is provided.  Patterns cna be saved and recalled fro disk.  ActiveX control also included for use with compatible programming languages.  Both top-level and ActiveX software include on-screen help.  Instruction manual supplied in both printed and PDF formats.