Electrode Fault Detection
When a constant current output is chosen and the unit is operating in 4 or 2
pole interferential mode (also in Russian, diadynamic, sinusoidal, galvanic
or Träbert modes for the Interferential 970 unit) the electrode impedance is
monitored to ensure that adequate electrode contact is maintained.
If the unit detects an electrode impedance too high to safely deliver the
required current, then the output is terminated, an error message window is
displayed, and an intermittent alarm is sounded. The output channel in
which the contact error has occurred is also displayed in the message
window.
Touch ‘OK’ to cancel the alarm and clear the error message. The remaining
treatment time is maintained. Check the electrodes and leads before
continuing treatment. If rubber pad electrodes and sponge covers are being
used check that they are held securely with even touch by the elasticated
bandages and that the sponges have not dried out.
The electrode fault message can also be triggered by trying to turn the
output level up too quickly.
Note: In soft water areas it may be necessary to add a small amount of
bicarbonate of soda to the water used to wet the sponges in order to
achieve adequate contact.
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