Difference between revisions of "Analytical Balance"

From Makers Local 256
Jump to: navigation, search
m (Equipment/Acquisition: updated)
m (Analytical Balance Links: added hackaday links)
 
(6 intermediate revisions by one user not shown)
Line 10: Line 10:
  
 
== Analytical Balance Links ==
 
== Analytical Balance Links ==
 +
* [http://hackaday.com/2013/06/12/building-a-digital-scale-from-scratch/ Hackaday!]
 +
** [http://morf.lv/modules.php?name=tutorials&lasit=19#.UbjEcHdXq3F Strain Guage based weight sensor]
 +
*** Justin says he used the wrong glue though ("you are supposed to use cyanoacrylate glue (super glue) the epoxy is horrible and transfers load incorrectly")
 +
*** He also says that a better amp to use would have been ADS1231
 +
 +
[http://en.wikipedia.org/wiki/Wheatstone_bridge Wheatstone bridge]
  
 
Magnetic Force Restoration
 
Magnetic Force Restoration
Line 21: Line 27:
 
# [http://en.wikipedia.org/wiki/Capacitive_sensing Wikipedia: Capacitive sensing]
 
# [http://en.wikipedia.org/wiki/Capacitive_sensing Wikipedia: Capacitive sensing]
 
# [http://zone.ni.com/devzone/cda/ph/p/id/66 Displacement, Location, or Position Sensors]
 
# [http://zone.ni.com/devzone/cda/ph/p/id/66 Displacement, Location, or Position Sensors]
 +
 +
Physics
 +
# [http://en.wikipedia.org/wiki/Lever Levers]
 +
# [http://en.wikipedia.org/wiki/Instrumentation_amplifier Instrumentation amplifier]
 +
# [http://www.analog.com/en/content/cu_dh_designers_guide_to_instrumentation_amps/fca.html DESIGNER'S GUIDE TO INSTRUMENTATION AMPLIFIERS]
 +
 +
Patents
 +
# [http://www.google.com/patents/US3604525?printsec=abstract#v=onepage&q&f=false Patent from 1971] (opamps!)
 +
# [http://www.google.com/patents?id=PW4uAAAAEBAJ&printsec=abstract&zoom=4#v=onepage&q&f=false Patent from 1979]
 +
# [http://www.societyofrobots.com/robotforum/index.php?topic=9840.0 OpAmp tutorial]
 +
# [http://www.electronics-lab.com/blog/?tag=lm1875 Amplifier Circuits]
 +
# [http://www.ti.com/lit/an/slod006b/slod006b.pdf The OpAmp Bible]
  
 
== Equipment/Acquisition ==
 
== Equipment/Acquisition ==
Line 26: Line 44:
 
* 20 Neodymium rod magnet 3mm x 10mm N35 (ebay-uk: $8.25:arrived)
 
* 20 Neodymium rod magnet 3mm x 10mm N35 (ebay-uk: $8.25:arrived)
 
* Calibration weight set (100g to 10 mg) (ebay: $17:arrived)
 
* Calibration weight set (100g to 10 mg) (ebay: $17:arrived)
 +
 +
 +
== Calibration Weight Calibration (yo dawg) ==
 +
From the balance we used to verify the weights' mass:
 +
Calibration info from the balance just a few days before:
 +
 +
'''Load Test (within tolerance)'''
 +
{| class="wikitable sortable" border="1" style="margin: left; width: 30%; border:solid #EFEFF1; -moz-border-radius: 10px; background:white; padding:8px;"
 +
|-
 +
! style="background: #DDDDDD"| Actual Weight
 +
! style="background: #DDDDDD"| Reading
 +
|-
 +
| 0.0000 g
 +
| 0.0000 g
 +
|-
 +
| 0.0200 g
 +
| 0.0200 g
 +
|-
 +
| 0.1000 g
 +
| 0.1005 g
 +
|-
 +
| 2.0000 g
 +
| 2.0006 g
 +
|-
 +
| 50.0000 g
 +
| 50.0000 g
 +
|-
 +
| 100.0000 g
 +
| 99.9998 g
 +
|-
 +
| 150.0000 g
 +
| 149.9986 g
 +
|-
 +
| 200.0000 g
 +
| 200.0003 g
 +
|-
 +
| 210.0000 g
 +
| 209.9999 g
 +
|}
 +
 +
'''Weights'''
 +
{| class="wikitable sortable" border="1" style="margin: left; width: 30%; border:solid #EFEFF1; -moz-border-radius: 10px; background:white; padding:8px;"
 +
|-
 +
! style="background: #DDDDDD"| Stated Weight
 +
! style="background: #DDDDDD"| Reading
 +
|-
 +
| 100 g
 +
| 100.0045 g
 +
|-
 +
| 50 g
 +
| 50.0025 g
 +
|-
 +
| 20 g
 +
| 20.0040 g
 +
|-
 +
| 20 g
 +
| 20.0000 g
 +
|-
 +
| 10 g
 +
| 10.0000 g
 +
|-
 +
| 5 g
 +
| 5.0035 g
 +
|-
 +
| 2 g
 +
| 2.0157 g
 +
|-
 +
| 2 g
 +
| 2.0159 g
 +
|-
 +
| 1 g
 +
| 0.9985 g
 +
|-
 +
| 0.500 g
 +
| 0.5280 g
 +
|-
 +
| 0.200 g
 +
| 0.2012 g
 +
|-
 +
| 0.200 g
 +
| 0.1992 g
 +
|-
 +
| 0.100 g
 +
| 0.1186 g
 +
|-
 +
| 0.050 g
 +
| 0.0510 g
 +
|-
 +
| 0.020 g
 +
| 0.0238 g
 +
|-
 +
| 0.020 g
 +
| 0.0230 g
 +
|-
 +
| 0.010 g
 +
| 0.0089 g
 +
|}
  
  
 
[[Category:OpenLab]]                                                  <!--MAKE AS MANY CATEGORIES AS YOU NEED-->
 
[[Category:OpenLab]]                                                  <!--MAKE AS MANY CATEGORIES AS YOU NEED-->

Latest revision as of 14:20, 12 June 2013

Creator:
EnabrinTain
Status:
Research
Born On:
11:15, 22 January 2013 (CST)
Last Updated:
14:20, 12 June 2013 (CDT)

Overview

This is where I'm hanging research for building an Analytical Balance. I'd prefer to drive it with an arduino, maybe even make a shield for it.


Analytical Balance Links

  • Hackaday!
    • Strain Guage based weight sensor
      • Justin says he used the wrong glue though ("you are supposed to use cyanoacrylate glue (super glue) the epoxy is horrible and transfers load incorrectly")
      • He also says that a better amp to use would have been ADS1231

Wheatstone bridge

Magnetic Force Restoration

  1. Simplifying the Electronic Balance Load Cell
  2. PDF
  3. SCIENTECH BALANCES
  4. Solenoid Coil Electromagnetic Force Calculator

Capacitive Sensors

  1. Capacitive Displacement Sensors
  2. Wikipedia: Capacitive sensing
  3. Displacement, Location, or Position Sensors

Physics

  1. Levers
  2. Instrumentation amplifier
  3. DESIGNER'S GUIDE TO INSTRUMENTATION AMPLIFIERS

Patents

  1. Patent from 1971 (opamps!)
  2. Patent from 1979
  3. OpAmp tutorial
  4. Amplifier Circuits
  5. The OpAmp Bible

Equipment/Acquisition

  • 20 Neodymium Magnets 15 x 10 x 5 mm Ring N48 (ebay: $35.78:arrived)
  • 20 Neodymium rod magnet 3mm x 10mm N35 (ebay-uk: $8.25:arrived)
  • Calibration weight set (100g to 10 mg) (ebay: $17:arrived)


Calibration Weight Calibration (yo dawg)

From the balance we used to verify the weights' mass: Calibration info from the balance just a few days before:

Load Test (within tolerance)

Actual Weight Reading
0.0000 g 0.0000 g
0.0200 g 0.0200 g
0.1000 g 0.1005 g
2.0000 g 2.0006 g
50.0000 g 50.0000 g
100.0000 g 99.9998 g
150.0000 g 149.9986 g
200.0000 g 200.0003 g
210.0000 g 209.9999 g

Weights

Stated Weight Reading
100 g 100.0045 g
50 g 50.0025 g
20 g 20.0040 g
20 g 20.0000 g
10 g 10.0000 g
5 g 5.0035 g
2 g 2.0157 g
2 g 2.0159 g
1 g 0.9985 g
0.500 g 0.5280 g
0.200 g 0.2012 g
0.200 g 0.1992 g
0.100 g 0.1186 g
0.050 g 0.0510 g
0.020 g 0.0238 g
0.020 g 0.0230 g
0.010 g 0.0089 g