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PERITONE Instruction Manual - GB
21
Interference
The PERITONE may be subject to Electromagnetic Interference
(see page 5).
Additionally, the power supplies of some notebook computers
can give off substantial amounts of interference to which the
PERITONE is susceptible. This is particularly the case when the
power supply “block” is the type with only a two pin connector
connecting it to the mains with no earth.
As a precaution, make sure that the power cable from the
notebook runs as far away as possible from the patient
connection wires of the PERITONE. (This does not include the
fibre optic cable as it is, electrically, entirely non-conductive).
Try to keep the PERITONE close to the patient’s body (in the
“field” of the patient) either on their lap, in their pocket or clipped
to their belt. Also run the electrode wires along the surface of the
patient’s body keeping the wires as close as is practically possible
all the way from the electrodes to the PERITONE unit and not
dangling freely in space away from the patient.
A relaxed muscle should read below 3.5 microvolts (µV). If you
find that, even when the patient’s muscle is soft and relaxed
to the touch, you are still reading persistent, unexpectedly high
µV levels, try turning off the notebook’s external mains power
supply. (The notebook will continue to run on it’s own internal
battery). If the µV reading(s) suddenly reduce and then go back
up when you turn on the notebook’s power supply then this is
the cause of the interference. If this problem causes ongoing
difficulties, please contact Patterson Medical for assistance.