Troubleshooting
For Static or Dynamic SEMG
Verify that hardware is setup and functioning properly:
Virtually 99% of the problems are simple to diagnose, and even simpler to fix. Before proceeding, be certain to verify that all hardware is setup properly. Surface EMG is sensitive to the effects of electrical interference caused by fans, motors and cell phones. Review each question in the table below to determine proper setup prior to continuing.
| 1. Are you using a grounded AC adapter? This is the plug which connects your computer to the surge protector or wall outlet. If you have only a two prong plug, the computer is not grounded properly and can cause electrical interference. NOTE: This is NOT the plug from the surge protector to the wall outlet, but the plug which connects directly to your computer.
If you do not have a grounded AC adapter, you need to purchase one for your computer. You can purchase a grounded AC adapter from www.IGO.COM. Call them at 888-205-0064 and ask for the 'JUICE' or ICE adapter. They offer a grounded adapter for most computers. |
 Grounded AC adapter |
| 2. Are you plugged into a grounded (three prong) AC outlet? It is recommended that you utilize a surge protector, and plug that directly into a grounded wall outlet (one which has three prongs).
Note that many older homes or offices do not have grounded AC outlets. See #3 below. |
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| 3. Are you in an older office where you question whether it may or may not have grounded outlets? Have you had other problems with electrical devices?
Some older offices may have 3 prong AC wall outlets, but the 3rd prong (ground) may not be connected properly. To test for a functional ground, purchase the Radio Shack part # 22-141 ( http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=22-141 ) for approximately $6.00 USD. Simply plug it into the wall outlet, and it can verify whether the outlet is properly grounded. If it is NOT properly grounded, contact an electrician to resolve the issue. It is a very important safety hazard, and when repaired will prevent damage to other electrical devices in addition to providing greater safety. |
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| 4. Are your electrodes in good shape? If electrodes are in poor shape, readings will typically be very high and erratic, as there is less silver to conduct electricity generated by the muscles as they contract. Bad electrodes will also require significantly more quickscan liquid to compensate for their lack of conductivity.
The way you can tell is by the color. If they are a dark black, they are considered in good condition. Electrodes which are light, shiny or have many spots are worn, and need to be replaced. You can order them by contacting MyoVision at 800-969-6961. |
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| 5. Is there a bluish liquid on the white plastic where the static electrodes are inserted? Your scanners should look like the image to the right: Clean with no bluish liquid between the electrodes.
If so, the bluish liquid may have been built up over time from use, or if you are placing the electrodes inside the jar instead on top of the jar, the Quickscan liquid splashes onto the device, creating higher readings by shorting out the probes. No damage is caused by this, but readings will be higher.Remove the electrodes from the probe by twisting and removing. Clean the plastic thoroughly with an alcohol soaked paper towel. Reinsert the electrodes. Always place the quickscan pads on the lid of the jar. Never place the instrument inside the jar itself. |
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1-800-969-6961
info@myovision.com