An alarm clock is a clock that is designed to make a sound, or some other signal, at a specific time to wake somebody or as a reminder. Alarm clocks are powered either by battery or connected to a socket with a cable. Radio clocks can play a radio broadcast or as the case may be a CD instead of preset sounds. Digital clocks have a display instead of an analogue clock face which can show more information and allows a weekday dependent wake-up time.
Due to the operation of the clock face with a motor or AC electronics for complex settings alternating electric and magnetic fields at higher frequency may be emitted.
Measurand | Value | Feature | Remarks |
---|---|---|---|
magnetic flux density | 0.252 µT (mean, measured) | - | geometric mean value in the frequency range from 54 Hz - 606 Hz at a distance of 50 cm ^{ [1] } |
magnetic flux density | 0.3 µT (maximum, measured) | - | at a distance of 121.92 cm; examined frequency: 60 Hz ^{ [2] } |
magnetic flux density | 0.5 µT (maximum, measured) | - | at a distance of 60.96 cm; examined frequency: 60 Hz ^{ [2] } |
magnetic flux density | 0.608 µT (mean, measured) | - | geometric mean value in the frequency range from 54 Hz - 606 Hz at a distance of 25 cm ^{ [1] } |
magnetic flux density | 0.7 µT (maximum, measured) | - | at a distance of 80 cm; examined frequency: 50 Hz resp. 60 Hz ^{ [3] } |
magnetic flux density | 1.972 µT (mean, measured) | - | geometric mean value in the frequency range from 54 Hz - 606 Hz at a distance of 10 cm ^{ [1] } |
magnetic flux density | 2 µT (maximum, measured) | - | at a distance of 40 cm; examined frequency: 50 Hz resp. 60 Hz ^{ [3] } |
magnetic flux density | 3 µT (maximum, measured) | - | at a distance of 30.48 cm; examined frequency: 60 Hz ^{ [2] } |
magnetic flux density | 6 µT (maximum, measured) | - | at the surface of the device; examined frequency: 50 Hz resp. 60 Hz ^{ [3] } |
magnetic flux density | 52.5 µT (mean, measured) | - | geometric mean value in the frequency range from 0 Hz - 6 Hz at a distance of 50 cm ^{ [1] } |
magnetic flux density | 55.5 µT (mean, measured) | - | geometric mean value in the frequency range from 0 Hz - 6 Hz at a distance of 10 cm; at a distance of 25 cm, the same geometric mean value has occured ^{ [1] } |
Measurand | Value | Feature | Remarks |
---|---|---|---|
magnetic flux density | 0.1 µT (measured) | - | at a distance of 30.48 cm ^{ [4] } |
magnetic flux density | 0.1 µT (mean, measured) | - | at a distance of 30.48 cm; examined frequency: 60 Hz ^{ [2] } |
magnetic flux density | 0.1 µT (maximum, measured) | - | at a distance of 1.22 m; examined frequency: 60 Hz ^{ [2] } |
magnetic flux density | 0.2 µT (maximum, measured) | - | at a distance of 60.96 cm; examined frequency: 60 Hz ^{ [2] } |
magnetic flux density | 0.4 µT (maximum) | - | at a distance of 15 cm ^{ [4] } |
magnetic flux density | 0.8 µT (maximum, measured) | - | at a distance of 30.48 cm; examined frequency: 60 Hz ^{ [2] } |
Measurand | Value | Feature | Remarks |
---|---|---|---|
magnetic flux density | 0.01 µT (mean, measured) | - | average value of 6 devices at a distance of 1 m; measurement bandwidth: 40 - 800 Hz ^{ [5] } |
magnetic flux density | 0.04 µT (mean, measured) | - | average value of 6 devices at a distance of 50 cm; measurement bandwidth: 40 - 800 Hz ^{ [5] } |
magnetic flux density | 0.07 µT | - | near the device; examined frequency: 120 Hz (first hamonic) ^{ [1] } |
magnetic flux density | 0.086 µT (mean, measured) | - | geomertic mean value in the frequency range from 54 Hz - 606 Hz at a distance of 50 cm ^{ [1] } |
magnetic flux density | 0.1 µT (maximum, measured) | - | near the device; examined frequency: 60 Hz ^{ [1] } |
magnetic flux density | 0.151 µT (mean, measured) | - | geometric mean value in the frequency range from 54 Hz - 606 Hz at a distance of 25 cm ^{ [1] } |
magnetic flux density | 0.2 µT (measured) | - | at a distance of 60.96 cm ^{ [4] } |
magnetic flux density | 0.397 µT (mean, measured) | - | geometric mean value in the frequency range from 54 Hz - 606 Hz at a distance of 10 cm ^{ [1] } |
magnetic flux density | 5 µT (mean, measured) | - | average value of 6 devices at a distance of 5 cm; measurement bandwidth: 40 - 800 Hz ^{ [5] } |
magnetic flux density | 20 µT (measured) | - | at a distance of 30.84 cm ^{ [4] } |
magnetic flux density | 52.5 µT (mean, measured) | - | geometric mean in the frequency range from 0 Hz - 6 Hz at a distance of 25 cm ^{ [1] } |
magnetic flux density | 54.2 µT (mean, measured) | - | geometric mean value in the frequency range from 0 Hz - 6 Hz at a distance of 50 Hz ^{ [1] } |
magnetic flux density | 60.7 µT (mean, measured) | - | geometric mean value in the frequency range from 0 Hz - 6 Hz at a distance of 10 cm ^{ [1] } |
Measurand | Value | Feature | Remarks |
---|---|---|---|
magnetic flux density | 0.01–0.02 µT (maximum) | - | at a distance of 1 m ^{ [6] } |
magnetic flux density | 0.1–1 µT (maximum) | - | at a distance of 30 cm ^{ [6] } |
magnetic flux density | 3–60 µT (maximum) | - | at a distance of 3 cm ^{ [6] } |
magnetic flux density | 0.06 µT (mean, measured) | - | average of 9 devices at a distance of 50 cm; measurement bandwidth: 0 - 3 kHz ^{ [8] } |
magnetic flux density | 0.5 µT | - | at a distance of 20 cm; measurement bandwidth: 0 - 3 kHz ^{ [8] } |
magnetic flux density | 0.74 µT (maximum) | - | at a distance of 40 cm ^{ [9] } |
magnetic flux density | 0.9 µT (maximum, measured) | - | maximum value at a distance of 80 cm; this measurement value also applies to digital clocks at the same distance; examined frequency: 50 Hz resp. 60 Hz ^{ [3] } |
magnetic flux density | 1.02 µT (mean, measured) | - | average of 9 devices at a distance of 10 cm; measurement bandwidth: 0 - 3 kHz ^{ [8] } |
magnetic flux density | 2.4 µT | - | at the surface; measurement bandwidth: 0 - 3 kHz ^{ [8] } |
magnetic flux density | 3 µT (maximum) | - | maximum value at a distance of 40 cm; this measurement value also applies to digital clocks at the same distance; examined frequency: 50 Hz resp. 60 Hz ^{ [3] } |
magnetic flux density | 6 µT (maximum) | - | maximum value directly in front of the device; this measurement value also applies to digital clocks at the same distance; examined frequency: 50 Hz resp. 60 Hz ^{ [3] } |
Measurand | Value | Feature | Remarks |
---|---|---|---|
magnetic flux density | 0.01 µT (mean, measured) | - | average value of 32 devices at a distance of 1 m; measurement bandwidth: 40 - 800 Hz ^{ [5] } |
magnetic flux density | 0.05 µT (mean, measured) | - | average value of 32 devices at a distance of 50 cm; measurement bandwidth: 40 - 800 Hz ^{ [5] } |
magnetic flux density | 0.2–2 µT (maximum) | - | at a distance of 30 cm ^{ [7] } |
magnetic flux density | 2.34 µT (mean, measured) | - | average value of 32 devices at a distance of 5 cm; measurement bandwidth: 40 - 800 Hz ^{ [5] } |
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