Nihon Kohden Corporation ZM-531PA Manuale Utente

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Operator’s Manual  ZM-520PA/521PA/530PA/531PA

•  Do not use the same channel for different patients. If the same channel is used 

for two patients, the two patients’ data will be lost due to mutual modulation 
interference, or another patient’s data may appear on the receiving monitor screen.

•  Do not use two transmitters with adjacent channels in the same hospital. If 

transmitters with adjacent channels are used, their radio waves interfere with each 
other.

Signal loss and artifact may occur because of the multipath cancellation* when using 
a transmitter.

*  Multipath Cancellation (Standing Wave Interference):
  When a radio wave reflects off a surface, there may be some points in the room where the 

reflected and direct waves are exactly out of phase. At these points in the room, the reflected 
and direct waves cancel each other out so that the signal strength is decreased. Locations where 
signal loss occurs are called “null spots”. If the transmitter is moving or nearby people or 
objects are moving, null spots can occur anytime and anywhere.

•  To prevent interference between channels, assign a channel administrator in the 

hospital and only he or she should manage channel assignment.

•  Use Nihon Kohden parts and accessories to assure maximum performance from your 

instrument.

•  For stable signal reception, it is recommended to use a diversity antenna system on 

the receiving monitor. Otherwise, spike noise from transient fading of electric field 
strength (for example, people moving) may interfere with the transmitter signal and 
may be mistaken as an arrhythmia on the receiving monitor.

•  For details on antennas and antenna construction, contact your Nihon Kohden 

representative. You can also refer to the Telemetry System Installation Guide.

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