Operator's Manual

Appendix C: EMC Information
0000679 | 18.12.2020 DC-Air™ Operator’s Manual 26 | 30
MHz, 18,07 MHz to 18,17 MHz, 21,0 MHz to 21,4 MHz, 24,89 MHz to 24,99 MHz, 28,0 MHz to 29,7 MHz and 50,0 MHz to 54,0
MHz.
a
Field strengths from fixed transmitters, such as base stations for radio (cellular/cordless) telephones and land mobile radios,
amateur radio, AM and FM radio 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 the DC-Air™ sensor is used exceeds the applicable RF compliance level above, the DC-Air™
sensor should be observed to verify normal operation. If abnormal performance is observed, additional measures may be
necessary, such as reorienting or relocating the DC-Air™ sensor.
b
Over the frequency range 150 kHz to 80 MHz, field strengths should be less than 3 V/m.
(*) Computer used with the DC-Air™ sensor system must meet this rating.
Recommended Separation Distances between Portable and Mobile RF Communications Equipment and the DC-Air™ sensor
The DC-Air™ sensor system is intended for use in an electromagnetic environment in which radiated RF disturbances are
controlled. The customer or the user of the DC-Air™ sensor system can help prevent electromagnetic interference by maintaining
a minimum distance between portable and mobile RF communications equipment (transmitters) and the DC-Air™ sensor system
as recommended below, according to the maximum output power of the communications equipment.
SEPARATION DISTANCE ACCORDING TO FREQUENCY OF TRANSMITTER (m)
RATED MAXIMUM OUTPUT POWER
OF TRANSMITTER (W)
150 kHz to 80 MHz
𝑑 =
(
3.5
𝑉
1
)
𝑃
80 MHz to 800 MHz
𝑑 =
(
3.5
𝐸
1
)
𝑃
800 MHz to 2,5 GHz
𝑑 =
(
7
𝐸
1
)
𝑃
0.01
0.12
0.12
0.23
0.1
0.37
0.37
0. 74
1
1. 17
1. 17
2. 33
10
3. 69
3. 69
7.38
100
11.67
11.67
23.33
For transmitters rated at a maximum output power not listed above, the recommended separation distance d in meters (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.
NOTE 1: At 80 MHz and 800 MHz, the separation distance for the higher frequency range applies.
NOTE 2: These guidelines may not apply in all situations. Electromagnetic propagation is affected by absorption and reflection from
structures, objects, and people.