The Model 280 Sensor Amplifier allows the user to "breadboard" custom sensors to be used
with the MicroLab Model 402 Environmental Interface or with a standard voltmeter. The sensor amplifier
includes several functions utilizing a number of circuits including:
± 5VDC variable power supply
Simple voltage divider
Operational amplifier
10 mA current source
Instrumentation amplifier
By configuring your circuit with the jumper wires (included) and then connecting the Signal/Power
to J5 using the CAT-5 modular cable (included) you are ready to begin. The user is able to "patch"
circuits together for signal conditioning and then output to the Model 402 to read the result and to
perform analysis. The process is made easier given the intuitive layout of the assembly along with the
generous allotment of terminals in which to place the jumpers.
Instrumentation Amplifier
If signal source applied to instrumentation amplifier does not have a ground return, it is important
to provide a ground return for input circuit bias currents through resistors as shown to the right.
MicroLab Inc.
1700 W. Koch, Suite #6
Bozeman, MT 59715
