Instrumentation Amplifier
Contents
1. owners who may or may not be affiliated with connected to or sponsored by us gt 8 Printed on recycled paper2. Instrumentation Amplifier Order Code INA BTA Our Instrumentation Amplifier is used to condition signals to be compatible with Vernier interface products The amplifier provides the necessary gain and offset to allow you to connect a wide variety of measurement equipment to your interface and electronically collect store and analyze the data Although you may calibrate your software to display otherwise your interface unit can only measure a potential difference voltage Many laboratory instruments produce a voltage which varies as the instrument reading changes Examples include gas chromatographs spectrophotometers light meters and sound meters If you are familiar with electronics you may be able to go inside the instrument and find out where to measure this voltage signal Some instruments seen have chart recorder terminals that are designed for just this kind of thing Test the voltage range of this signal If the voltage happens to vary over a range that matches your interface then the signal can be fed directly to the interface and monitored by the software More likely the voltage signal will need to be amplified before it can be monitored Collecting Data with the Instrumentation Amplifier This sensor can be used with the following interfaces to collect data e Vernier LabQuest 2 or original LabQuest as a standalone device or with a computer e Vernier LabQuest Mini with a computer e Vernier LabPro with a computer
3. e Instrumentation Amplifier box where the sensor cable is located Connecting the Earth ground in this way should reduce or eliminate any electronic noise Also keep in mind that Logger Pro software and LabQuest App both have Peak Integration tools that can be used to integrate and quantify GC peaks Once you have collected GC data you can simply choose Peak Integration from the Analyze menu On this dialog you can select and integrate peaks one at a time NOTE Vernier products are designed for educational use Our products are not designed nor recommended for any industrial medical or commercial process such as life support patient diagnosis control of a manufacturing process or industrial testing of any kind Data collected using an Instrumentation Amplifier and GOW Mac Series 350 Gas Chromatograph Specifications Gain settings 150 75 7 5 15 3 and 1 5 5 Linearity 1 Power 2 5 mA 5VDC Frequency Response 0 10kHz f3dB Impedance IMQ to ground Calibration values 1V slope 0 471648 intercept 0 8584 200mV slope 0 117912 intercept 0 2146 20mV slope 0 013181 intercept 0 02399 0 1V slope 0 308642 intercept 0 0 200mV slope 0 062617 intercept 0 0 20mV slope 0 006636 intercept 0 Use as a Current Meter The Instrumentation Amplifier can be used to monitor current instead of voltage By placing a resistor between the terminals the voltage amplified becomes proportional to the c
4. fer Guidebook DataMate program Use DataMate with LabPro or CBL 2 and TI 73 TI 83 TI 84 TI 86 TI 89 and Voyage 200 calculators See the LabPro and CBL 2 Guidebooks for instructions on transferring DataMate to the calculator e DataQuest Software for TI Nspire This calculator application for the TI Nspire can be used with the EasyLink or TI Nspire Lab Cradle e LabVIEW National Instruments LabVIEW software is a graphical programming language sold by National Instruments It is used with SensorDAQ and can be used with a number of other Vernier interfaces See www vernier com labview for more information This sensor is equipped with circuitry that supports auto D When used with LabQuest 2 LabQuest LabQuest Mini LabPro Go Link SensorDAQ TI Nspire Lab Cradle EasyLink or CBL 2 the data collection software identifies the sensor and uses pre defined parameters to configure an experiment appropriate to the recognized sensor How the Instrumentation Amplifier Works The amplifier is a monolithic instrumentation amplifier with variable gain and offset settings An instrumentation amplifier contains precision feedback components and circuitry that is necessary for small signal amplification The Instrumentation Amplifier does three primary tasks e Provides six different gain settings to amplify small signals to levels appropriate for our interfacing equipment e Offsets the voltage so it is always in
5. or TI graphing calculator e Vernier Go Link e Vernier EasyLink e Vernier SensorDAQ e CBL 2 e TI Nspire Lab Cradle Here is the general procedure to follow when using the Instrumentation Amplifier 1 Connect the Instrumentation Amplifier to the interface 2 Start the data collection software 3 The software will identify the Instrumentation Amplifier and load a default data collection setup You are now ready to collect data Tf you are using Logger Pro 2 with either a ULI or SBI the sensor will not auto ID Open an experiment file for the Instrumentation Amplifier in the Probes amp Sensors folder Data Collection Software This sensor can be used with an interface and the following data collection software e Logger Pro 3 This computer program is used with LabQuest 2 LabQuest LabQuest Mini LabPro or Go Link Logger Lite This computer program is used with LabQuest 2 LabQuest LabQuest Mini LabPro or Go Link LabQuest App This program is used when LabQuest 2 or LabQuest is used as a standalone device EasyData App This calculator application for the TI 83 Plus and TI 84 Plus can be used with CBL 2 LabPro and Vernier EasyLink We recommend version 2 0 or newer which can be downloaded from the Vernier web site www vernier com easy easydata html and then transferred to the calculator See the Vernier web site www vernier com calc software index html for more information on the App and Program Trans
6. the range of 0 to 3 5 volts This allows the amplifier to be used with negative signals even though some of our interfaces only use 0 5 V inputs e Provides filtering of high frequency signals Wires that connect the instrument to the amplifier are prone to pick up electrical noise much like a radio antenna By filtering out these signals only the data of interest are left When set to the 20 mV 200 mV and 1 V positions the amplification is set to 150 15 and 3 respectively The difference in voltage at the red and black terminal is amplified and output with reference to ground When set to 20 mV 200 mV and 1 V setting the amplification is set to 75 7 5 and 1 5 respectively The difference in voltage at the red and black terminal is amplified and output with reference to 1 85 V Amplify an Instrument s Chart Recorder Output Many lab instruments provide a low voltage output designed for interfacing to a chart recorder You may use these outputs with the Instrumentation Amplifier to interface to a computer This graph shows the output of a gas chromatograph processing a sample of fatty acids dissolved in toluene solvent Eb El Epemet se nspa Yem Setup aide Help laja Hae e ee e Stat 35 Logger Peo GC Goo 22M Tips for Using the Instrumentation Amplifier with a Gas Chromatograph If your voltage readings are noisy you should connect the Earth ground of the Gas Chromatograph to the black post on the end of th
7. urrent according to I V G R where V is the voltage read G is the gain setting of the amplifier and R is the resistor value To monitor current in a circuit you want to choose a small resistor value for example 0 1Q or 1Q resistor with a rating of at least 1 W For monitoring a current output device you will need to choose a termination resistor that is appropriate for that device call for details or consult the manufacturers specifications For best accuracy perform a calibration using an open circuit and a known current source Vernier also sells a Current Probe order code DCP BTA which has a range of 600 mA Warranty Vernier warrants this product to be free from defects in materials and workmanship for a period of five years from the date of shipment to the customer This warranty does not cover damage to the product caused by abuse or improper use Vernier Software amp Technology 13979 S W Millikan Way e Beaverton OR 97005 2886 Toll Free 888 837 6437 e 503 277 2299 e FAX 503 277 2440 info vernier com e www vernier com Rev 6 5 2012 Logger Pro Logger Lite Vernier LabQuest 2 Vernier LabQuest Vernier LabQuest Mini Vernier LabPro Go Link Vernier EasyLink and other marks shown are our trademarks or registered trademarks in the United States TI Nspire CBL 2 TI GRAPH LINK and TI Connect are trademarks of Texas Instruments All other marks not owned by us that appear herein are the property of their respective
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