Difference between revisions of "Analytical Balance"
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# [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] | ||
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| + | 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] | ||
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| + | 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] | ||
== Equipment/Acquisition == | == Equipment/Acquisition == | ||
Revision as of 08:52, 26 February 2013
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Creator: |
Contents
[hide]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
Magnetic Force Restoration
- Simplifying the Electronic Balance Load Cell
- SCIENTECH BALANCES
- Solenoid Coil Electromagnetic Force Calculator
Capacitive Sensors
- Capacitive Displacement Sensors
- Wikipedia: Capacitive sensing
- Displacement, Location, or Position Sensors
Physics
Patents
- Patent from 1971 (opamps!)
- Patent from 1979
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 |
| 500 mg | 0.5280 g |
| 200 mg | 0.2012 g |
| 200 mg | 0.1992 g |
| 100 mg | 0.1186 g |
| 50 mg | 0.0510 g |
| 20 mg | 0.0238 g |
| 20 mg | 0.0230 g |
| 10 mg | 0.0089 g |
