ADInstruments PowerLab/4SP Owner's Manual page 8

Preventative Inspection and Maintenance
Both PowerLab systems and ADInstruments front-ends are
maintenance free and do not require periodic calibration or
adjustment to ensure medical safety. Internal diagnostic software
performs system checks during power up and will report errors if a
significant problem is found.
There is no need to open the instrument for inspection or
maintenance, and doing so within the warranty period will void the
warranty.
If you so wish, your PowerLab system can be periodically checked for
basic medical safety by using an appropriate medical safety testing
device. Tests such as earth leakage, earth bond, insulation resistance,
patient leakage and auxiliary currents and power cable integrity can
all be performed on the PowerLab system without having to remove
the covers. You should follow the instructions for the testing device if
performing such tests.
If the PowerLab system is found not to comply with such testing you
should contact your PowerLab dealer to arrange for the equipment to
be checked and serviced. You should not attempt to service the device
yourself.
viii PowerLab Owner's Guide