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):

 :KHQDUDGLRZDYHUHÀHFWVRIIDVXUIDFHWKHUHPD\EHVRPHSRLQWVLQWKHURRPZKHUHWKH

UHÀHFWHGDQGGLUHFWZDYHVDUHH[DFWO\RXWRISKDVH$WWKHVHSRLQWVLQWKHURRPWKHUHÀHFWHG

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.