User's Manual

2 Operator’s Manual ZM-520PA/521PA/530PA/531PA
CAUTION
• 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.
CAUTION
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.
NOTE
• 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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