Meditech C-Scan, Руководство пользователя

Страница: 26 / 89

15
conduction
IEC 61000-4-6
Radio frequency
radiation
IEC 61000-4-3
150 kHz～80 MHz
3 V/m
80 MHz～2.5 GHz
values)
3 V/m
corresponding to the frequency of the
transmitter.
Recommended isolation distance
d=1.2
d=1.2 80 MHz～800 MHz
d=2.3 800 MHz～2.5 GHz
式中：
P — — Maximum transmitter output
power, in watts (W), provided by
the transmitter manufacturer；
d——Recommended separation distance in
meters (m).
The field strength of a fixed RF transmitter is
determined by survey of the electromagnetic
field, and each frequency range b should be
lower than the coincidence level.
Interference may occur near the device
that signs the following symbols
Note 1: At 80 MHz and 800 MHz frequencies, the formula for the higher frequency band should be
used.
Note 2: These guidelines may not be appropriate for all situations. Electromagnetic transmission by
the buildings, objects and the body's absorption and reflection.
1. Stationary transmitters, such as wireless (cellular / cordless) telephones and terrestrial mobile radio
base stations, amateur radio, AM-FM radio, and television broadcasting, are not theoretically predictable.
In order to assess the electromagnetic environment of fixed RF transmitters, consideration should be
given to the investigation of electromagnetic fields. If the measured all-digital portable diagnostic
ultrasound system where the field strength is higher than the RF compliance level, you should observe
all-digital handheld ultrasonic diagnostic apparatus to verify its normal operation. If anomalous
performance is observed, supplemental measures may be necessary, such as reorienting the orientation
or position of the all-digital hand-held ultrasonic diagnostic apparatus.
2. The field strength should be less than 3 V / m over the entire frequency range from 150 kHz to 80 MHz.
Table 4
Recommended separation distance between portable and mobile RF communication equipment and this
equipment
This equipment is intended for use in a controlled electromagnetic environment where RF emissions are
disturbed. Depending on the maximum output power of the communication device, the purchaser or user
of the device may prevent electromagnetic interference by maintaining a minimum distance between the
portable and mobile RF communication devices (transmitters) and the device.
Transmitter maximum
rated output power
Corresponding to the different frequencies of the transmitter isolation
distance/m