Application Procedures

Electrode performance can be improved by minimizing electrode output impedance and maximizing amplifier input impedance. The differential amplifier (used with electrodes in a bipolar configuration) should also have a high common-mode rejection ratio (CMRR). Unprepared skin results in input impedance mismatch and thus lowers the CMRR.

Electrode Treatment

• Can be cleaned and sterilized with a damp cloth and mild detergent or with isopropyl alcohol swabs.
• Do not scrape or dent metal contacts
• Do not completely submerge the electrodes in any liquid
• Avoid static discharge  

Procedure

Before an electrode is applied, the skin should be shaved and rubbed vigorously with alcohol. The alcohol should be allowed to dry before the electrode is applied.

Using the electrode interface adhesive (shown in the picture below), apply the electrode at the appropriate location with the arrow on the Delsys casing parallel to the muscle fibre.

The reference electrode should be attached to the patella, using the DermaSport electrode as shown below.

In order to reduce motion artifact due to relative movement between the electrode, its cables and the skin, the electrodes and part of the cable are secured to the leg using 3M tape.

Connect the electrode cables to the belt-mounted unit in the appropriately labeled channels (record on paper which channel carries which muscle EMG signal). Connect the belt-mounted unit to the network cable which should already be attached to the main amplifier unit.

Any cable carrying an EMG signal should be uncoiled and drape freely.

Turn the power on to the main amplifier (power switch should depressed on the ‘I’ to indicate the on position). The tone switch can be turned on if you wish to hear (the lights of the specific channel always light up) when saturation or line interference occurs.

Allow the electrodes a few minutes to settle before taking recordings.

Ordering Information

Product

3M Micropore tape
#1530-1
1" wide - BOX of 12

Company

Ingram and Bell
Tel: (514) 633-6767

Product

Disposable Non-Sterilized Medical Prep-Razors
#SEM139083
Case of 100 ($58.00)

Company

Dufort & Lavigne Ltee.
2165, rue Parthenais
Montreal (Quebec) H2K 3T3
Tel: (514) 527-9381
FAX: (514) 527-6883

Product

Alcohol Wipes
#KEN63001
200 per box, 2-ply ($4.25)

Company

Dufort & Lavigne Ltee.
2165, rue Parthenais
Montreal (Quebec) H2K 3T3
Tel: (514) 527-9381
FAX: (514) 527-6883