Nissei WS-820, Instructions Manual, Page: 17 / 76

CARE AND MAINTENANCES
TECHNICAL DESCRIPTION
WS-820 complies with the EMC, electromagnetic compatibility, standard, IEC60601-1-2. Refer to the tables below for specific information regarding compliance to the standard. WS-820, as a medical electrical equipment, needs special precautions regarding EMC and needs to be installed and put into service
according to the EMC information provided below. Portable and mobile RF communications equipments can affect the device. The use of accessories other than those specified in this manual may result in increased emissions or decreased immunity of the device. WS-820 should not be used adjacent to or
stacked with other equipment.
WS-820 is intended for use in the electromagnetic environment specified below. The customer or the user of WS-820 should assure that it is used in
such an environment.
Emissions test
RF emissions CISPR 11
RF emissions CISPR 11
Harmonic emissions IEC 61000-3-2
Voltage fluctuations / flicker emissions
IEC 61000-3-3
Compliance
Group 1
Class B
N/A
N/A
Electromagnetic environment - guidance
WS-820 uses RF energy only for its internal function. Therefore, its RF emissions are very
low and are not likely to cause any interference in nearby electronic equipment.
WS-820 is suitable for use in all establishments, including domestic establishments and
those directly connected to the public low-voltage power supply network that supplies
buildings used for domestic purposes.
Table 201 - Guidance and manufacturer’s declaration - electromagnetic emissions -
WS-820 is intended for use in the electromagnetic environment specified below. The customer or the user of WS-820 should assure that it is used in
such an environment.
NOTE U
T
is the a.c. mains voltage prior to application of the test level.
Immunity test
Electrostatic discharge
(ESD) IEC 61000-4-2
Electrical fast transient/
burst IEC 61000-4-4
Surge IEC 61000-4-5
Voltage dips, short
interruptions and voltage
variations on power supply
input lines IEC 61000-4-11
Power frequency (50/60 Hz)
magnetic field IEC
61000-4-8
IEC 60601 test level
±6 kV contact
±8 kV air
±2 kV for power supply lines
±1 kV for input/ output lines
±1 kV differential mode
±2 kV common mode
<5% U
T
(>95% dip in U
T
) for 0,5 cycle
40% U
T
(60% dip in U
T
) for 5 cycles
70% U
T
(30% dip in U
T
) for 25 cycles
<5% U
T
(>95% dip in U
T
) for 5 sec
3 A/m
Compliance level
N/A
N/A
N/A
N/A
3 A/m
Electromagnetic environment - guidance
Floors should be wood, concrete or ceramic tile. If
floors are covered with synthetic material, the relative
humidity should be at least 30 %.
N/A
N/A
N/A
Power frequency magnetic fields should be at levels
characteristic of a typical location in a typical
commercial or hospital environment.
Table 202 - Guidance and manufacturer’s declaration - electromagnetic immunity -
WS-820 is intended for use in the electromagnetic environment specified below. The customer or the user of WS-820 should assure that it is used in
such an environment.
NOTE1 At 80 MHz and 800 MHz, the higher frequency range applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects and people.
a
Field strength from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios, amateur radio, AM and FM
radios broadcast and TV broadcast cannot be predicted theoretically with accuracy. To assess the electromagnetic environment due to fixed RF
transmitters, an electromagnetic site survey should be considered. If the measured field strength in the location in which WS-820 is used exceeds the
applicable RF compliance level above, WS-820 should be observed to verify normal operation. If abnormal performance is observed, additional measures
may be necessary, such as reorienting or relocating WS-820.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than [V
1
] V/m.
Immunity test
Conducted RF
IEC 61000-4-6
Radiated RF
IEC 61000-4-3
IEC 60601 test level
3 Vrms
150 kHz to 80 MHz
3 V/m
80 MHz to 2,5 GHz
Compliance level
N/A
3 V/m
Electromagnetic environment - guidance
Portable and mobile RF communications equipment should be used no closer to any part
of WS-820, including cables, than the recommended separation distance calculated from the
equation applicable to the frequency of the transmitter.
Recommended separation distance
N/A
d=1.2√P, 80 MHz to 800 MHz d=1.2√P, 800 MHz to 2,5 GHz
Where P is the maximum output power rating of the transmitter in watts (W)
according to the transmitter manufacturer and d is the recommended separation
distance in metres (m).
Field strengths from fixed RF transmitters, as determined by an electromagnetic site survey,
a
should be less than the compliance level in each frequency range. b
Interference may occur in the vicinity of equipment marked with the following
symbol:
Table 204 - Guidance and manufacturer’s declaration - electromagnetic immunity -
WS-820 is intended for use in an electromagnetic environment in which radiated RF disturbances are controlled. The customer or the user of
WS-820 can help prevent electromagnetic interference by maintaining a minimum distance between portable and mobile RF communications
equipment (transmitters) and WS-820 as recommended below, according to the maximum output power of the communications equipment.
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in metres (m) can be estimated using
the equation applicable to the frequency of the transmitter, where P is the maximum output power rating of the transmitter in watts (W) according to
the transmitter manufacturer.
NOTE1 At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE2 These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from structures,
objects and people.
Rated maximum output power
of transmitter, W
0,01
0,1
1
10
100
Separation distance according to frequency of transmitter m
150 kHz to 80 MHz, N/A
N/A
N/A
N/A
N/A
N/A
80 MHz to 800 MHz, d=1.2√P
0,12
0,38
1,2
3,8
12
800 MHz to 2,5 GHz, d=1.2√P
0,23
0,73
2,3
7,3
23
Table 206 - Recommended separation distances between portable and mobile RF communications equipment and WS-820 -
Do not inflate the cuff (start a measurement) when it has not been wrapped
around your wrist. Do not try to stretch or twist the cuff, and do not bring it into
contact with sharp or pointed objects.
Do not disassemble or modify the unit.
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