METIS V2 Instruction Manual

Hide thumbs

Table Of Contents

Table of Contents

Quick Links

Download this manual

Data Logger V2

Instruction Manual

Joe Holdsworth

7-29-2018

Table of Contents

Need help?

Do you have a question about the V2 and is the answer not in the manual?

Questions and answers

Summary of Contents for METIS V2

Page 1 Data Logger V2 Instruction Manual Joe Holdsworth 7-29-2018...
Page 2: Table Of Contents
Data Logger V2 July 29, 2018 Contents Revision History ............................2 Specifications ..............................3 Power Limits .............................. 3 Data Rates ..............................3 Other Specifications ..........................3 Pin Outs................................. 4 AS218-35SN .............................. 4 AS210-35SN .............................. 6 Data Logger Layout ............................7 Quick Start Guide ............................
Page 3: Revision History
Data Logger V2 July 29, 2018 Revision History Revision Comment Author Date Creation of Document and first issue Joe Holdsworth 29/07/2018 Corrections Joe Holdsworth 31/07/2018 Page 2 of 19...
Page 4: Specifications
Data Logger V2 July 29, 2018 Specifications Power Limits Parameter Value Note External Voltage Supply Range 9-36VDC Max reverse voltage protection This protection only applies to the external power in pins – be careful not to apply>3.3v to the A to D pins...
Page 5: Pin Outs
Data Logger V2 July 29, 2018 Pin Outs AS218-35SN Connector Name: Connector Part No. AS218-35SN Connector Mating Part No. AS618-35PX Pin No. Name Notes 3.3V_AD1 GND_AD1 AD1_1+ AD1_1- AD1_2+ AD1_2- AD1_3+ AD1_3- AD1_4+ AD1_4- 3.3V_AD1 GND_AD1 AD1_5+ AD1_5- AD1_6+ AD1_6-...
Page 6 Data Logger V2 July 29, 2018 Pin No. Name Notes AD2_11+ AD2_11- AD2_12+ AD2_12- 3.3V_AD2 GND_AD2 AD2_13+ AD2_13- AD2_14+ AD2_14- AD2_15+ AD2_15- AD2_16+ AD2_16- 3.3V_AD3 GND_AD3 AD3_17+ AD3_17- AD3_18+ AD3_18- AD3_19+ AD3_19- AD3_20+ AD3_20- 3.3V_AD3 GND_AD3 AD3_21+ AD3_21- AD3_22+ AD3_22-...
Page 7: As210-35Sn
Data Logger V2 July 29, 2018 AS210-35SN Connector Name: DIGITAL Connector Part No. AS218-35SN Connector Mating Part AS618-35PX Pin No. Name Notes 3.3V 3.3V 3.3V External power in -tive 9-36VIN External power in +tive Page 6 of 19...
Page 8: Data Logger Layout
Data Logger V2 July 29, 2018 Data Logger Layout • Charging port – A micro USB connector to charge the devices battery, any 5v USB charging device can be used to recharge this logger. Charge time is dependent on charger but maximum charge rate is 500 milliamps, at this rate the unit will take just under 4 hours to fully charge.
Page 9: Quick Start Guide
Data Logger V2 July 29, 2018 Quick Start Guide • Insert a Micro SD car into the slot on the bottom of the data logger. • Turn On the Device. • Check you do not have a low battery warning.
Page 10: Configuration Software
Data Logger V2 July 29, 2018 Configuration Software To configure the unit please visit www.metisengineering.com to download software. Go to the page where you purchased the unit from and the latest software will be there. Once the software is downloaded and installed please save the ‘unit.cfg’ config file produced to the micro USB stick that is going to be inserted into the unit.
Page 11: Application Notes
If you select a channel as a K-Type thermocouple and don’t connected one this value will be the internal box temperature. Strain Gauges Metis Engineering offer consultation and bridge completion modules for strain gauge installation. National Instruments have a good page on the different strain gauge setups http://www.ni.com/white- paper/3642/en/ Appendix A has the full article.
Page 12: Appendix A - Strain Gauges
Data Logger V2 July 29, 2018 Appendix A – Strain Gauges What is strain? In mechanical testing and measurement, you need to understand how an object reacts to various forces. The amount of deformation a material experiences due to an applied force is called strain. Strain is defined as the ratio of the change in length of a material to the original, unaffected length, as shown in Figure 1.
Page 13 Data Logger V2 July 29, 2018 Figure 2. Axial strain measures how a material stretches or pulls apart. Bending strain measures a stretch on one side and a contraction on the other side. How do you measure strain? You can measure strain using several methods, but the most common is with a strain gage. A strain gage’s electrical resistance varies in proportion to the amount of strain in the device.
Page 14 Data Logger V2 July 29, 2018 Figure 3. The electrical resistance of metallic grid changes in proportion to the amount of strain experienced by the test specimen. A fundamental parameter of the strain gage is its sensitivity to strain, expressed quantitatively as the gage factor (GF).
Page 15 Data Logger V2 July 29, 2018 Figure 4. Strain gages are configured in Wheatstone bridge circuits to detect small changes in resistance. The Wheatstone bridge is the electrical equivalent of two parallel voltage divider circuits. R1 and R2 compose one voltage divider circuit, and R4 and R3 compose the second voltage divider circuit. The output of a Wheatstone bridge, Vo, is measured between the middle nodes of the two voltage dividers.
Page 16 Data Logger V2 July 29, 2018 Figure 5. Quarter-Bridge Strain Gage Configurations Configuration Type II Ideally, the resistance of the strain gage should change only in response to applied strain. However, strain gage material, as well as the specimen material to which the gage is applied, also responds to changes in temperature.
Page 17 Data Logger V2 July 29, 2018 Configuration I Configuration II - Bending Strain Only Figure 7. Half-bridge strain gages are two times more sensitive than quarter-bridge strain gages. Configuration Type I • Measures axial or bending strain • Requires half-bridge completion resistors to complete the Wheatstone bridge •...
Page 18 Data Logger V2 July 29, 2018 Figure 8. Full-Bridge Strain Gage Configurations Configuration Type I • Highly sensitive to bending strain only • R1 and R3 are active strain gages measuring compressive strain (–e) • R2 and R4 are active strain gages measuring tensile strain (+e) Configuration Type II •...
Page 19 Data Logger V2 July 29, 2018 Measurement Type Quarter Bridge Half-Bridge Full-Bridge Type I Type II Type I Type II Type I Type II Type III Axial Strain Bending Strain Compensation Transverse Sensitivity Temperature Sensitivity Sensitivity at 1000 µε ~0.5 ~0.5...
Page 20 Data Logger V2 July 29, 2018 temperature-compensated bridge configurations are more immune to temperature effects. Also consider using a configuration type that helps compensate for the effects of temperature fluctuations. Installation Installing strain gages can take a significant amount of time and resources, and the amount varies greatly depending on the bridge configuration.