Nihon Kohden Corporation ZM-520PA Benutzerhandbuch

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

 11

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.

Turn off the power of mobile phones, 
small wireless devices and other 
devices which produce strong 
electromagnetic interference around a 
patient (except for devices allowed by 
the hospital administrator). Radio 
waves from devices such as mobile 
phones or small wireless devices may 
be mistaken as pulse waves or 
respiration waves and the displayed 
data may be incorrect.

•  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.

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