PowerLab Teaching Series - Owner’s Guide
5
• All PowerLab units with a built-in Bio Amp are supplied with a 3-lead or 5-lead
Bio Amp subject cable and lead wire system. Bio Amps are only safe for human
connection if used with the supplied subject cable and lead wires.
• All PowerLab units with a built-in Bio Amp are not defibrillator-protected. Using
the Bio Amp to record signals during defibrillator discharges may damage the
input stages of the amplifiers. This may result in a safety hazard.
• Never use damaged Bio Amp cables or leads. Damaged cables and leads must
always be replaced before any connection to humans is made.
Isolated Stimulator Safety Instructions
The Isolated Stimulator outputs from the PowerLab with a built-in isolated stimulator
are electrically isolated and safe for human connection. However, they can produce
pulses of up to 100 V at up to 20 mA. Injury can still occur from careless use of these
devices. Several points must be observed for safe operation of the Isolated Stimulator:
• The Stimulus Isolator must only be used with the supplied bar stimulus electrode.
• The Isolated Stimulator output must not be used with individual (physically
separate) stimulating electrodes.
• Stimulation must not be applied across the chest or head.
• Do not hold one electrode in each hand.
• Always use a suitable electrode cream or gel and proper skin preparation to
ensure a low-impedance electrode contact. Using electrodes without electrode
cream can result in burns to the skin or discomfort for the subject.
• Subjects with implantable or external cardiac pacemakers, a cardiac condition,
or a history of epileptic episodes must not be subject to electrical stimulation.
• Always commence stimulation at the lowest current setting and slowly increase
the current.
• Stop stimulation if the subject experiences pain or discomfort.
• Do not use faulty cables, or those that have exhibited intermittent faults.
• Do not attempt to measure or record the Isolated Stimulator output while
connected to a subject using a PowerLab input or any other piece of equipment
that does not carry the appropriate regulatory symbol (see Regulatory Symbols
above).
• The Isolated Stimulator should not be used as a therapeutic device. The
PowerLabs are not intended as diagnostic, therapeutic or patient care
equipment. Doing so may result in severe risk to the safety of the subject
Always check the status indicator on the front panel. It will always flash green each time
the stimulator delivers a current pulse. A yellow flash indicates an ‘out-of-compliance’
(OOC) condition that may be due to poor electrode contact or electrode cream drying
up. Always ensure that there is good electrode contact at all times. Electrodes that
are le on a subject for some time need to be checked for dry contacts. An electrode
impedance meter can be used for this task.
• Always be alert for any adverse physiological e ects in the subject. At the first
sign of a problem, stimulation must be stopped, either from the so ware or
by flicking down the safety switch on the front panel of any built-in Isolated
Stimulator.
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