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14.0 Exposure limits Moreover, the significant differences of exposure limits for various groups of persons are clearly visible, as well as the corresponding “maximum values“. For EM fields at the workplace, there is a seperate prescription from the German “Berufsgenossenschaften“ (BGV B11) which allows higher exposure for brief amounts of time. Mathematical examples: The 50Hz power supply system (mains wiring, high-voltage lines) would have a maximum allowed electric field strength of under 250/0,050 = 5.000 V/m. In contrast, an energy-saving lamp with an operating frequency of 5kHz, the electric field strength may only amount to less than 87 V/m - a vast difference. Those low-frequency fields with the highest impact in daily life are those caused by regular mains wiring and appliances operated very closely to the human body, such as electrical shavers and hair dryers. Contrary to popular belief, appliances such as TVs, computers and monitors are neglectible as they are mostly shielded very well (TCO99) or operated at “large“ distances (TV) and thus, exposure levels are very low. 14.2 Device limits In contrast to limits for personal safety, the so-called device limits are often SIGNIFICANTLY more restrictive and are subject to greater variations depending on frequency. For example, a hair dryer’s limit is totally different to that of a computer monitor - values may well vary by a factor of 100. Nevertheless, all device limits must also conform to limits for personal safety and are a subset of those. A good example for device limits are the well-known monitor labelling schemes “MPR2“ and the more stringent “TCO99“, the latter of which will be outlined here. TCO99 recommendations are again frequency-dependant: Frequency E field [V/m] H field [µT] 5Hz-2kHz 10 0,200 2kHz-400kHz 1 0,010 There is a vast difference to the personal safety limits outlined previously. However, it is noteworthy that the TCO99 recommendation also prescribes complex details of the measurement setup such as specific distances, antennas, number of measurements taken, monitor settings etc. for correct measurement. 48 Firmware BETA50 / © 2005-2009 by Aaronia AG, DE-54597 Euscheid, www.aaronia.de
14.0 Exposure limits 14.3 “Construction-biological limits” & “Precautionary limits” The countless “construction-biological limits“ are vastly different from the official limits for personal safety - they are mostly significantly lower. To one’s great surprise, however, they often do not have any “frequency component“ (in contrast to the highly complex official ICNIRP limits, which are also legally binding in Germany). In other words, they are completely identical at, for instance, 16.7Hz (traction power) as well as 50Hz (mains). Hence, technicians in professional measurement technology are truly astounded at this rather “strange“ way to evaluate exposure limits, predominantly used by construction biologists. However, there is a simple explanation for this relatively simplistic way of evaluating exposure limits: The “measurement equipment“ used in this sector is predominantly based on the so-called “broadband/diode detector“ technology. However, it is physically impossible to conduct frequency-selective measurements with these devices. Hence, frequency-selective construction-biological limits would simply not be manageable. In any case, this might change very soon thanks to SPECTRAN, as frequency should not really be swept under the carpet and be done with. Even if supporting such trivial “precautionary limits“ in a real measurement device such as SPECTRAN does bother us intensely, we still decided to support at least the ECOLOG and BUND “precautionary limits“. The following limits can all be called up in “Exposure limits“ mode by using the right/left cursor keys - they will be displayed instantly: ECOLOG = ECOLOG institute precautionary limit* BUND = BUND precautionary limit for relaxation areas 0,1µT or 20V/m 0,01µT or 0,5V/m Please note that these values could change at any time. Thus, please consult the respective entities when in doubt. *Only applicable to 50Hz Firmware BETA50 / © 2005-2009 by Aaronia AG, DE-54597 Euscheid, www.aaronia.de 49
Page 1 and 2: Please read the following manual ca
Page 3 and 4: Contents Chapter Page 1.0 Safety pr
Page 5 and 6: 1.0 Safety precautions ATTENTION: A
Page 7 and 8: 3.0 LC Display 1 2 3 4 5 6 7 8 9 10
Page 9 and 10: 5.0 Your first measurement / Modes
Page 19 and 20: 6.0 Manual frequency selection 1.)
Page 21 and 22: 7.0 The main menu By pressing the m
Page 23 and 24: 7.0 The main menu There are TWO way
Page 25 and 26: 7.0 The main menu 7.6 Dim (1D, 2D o
Page 27 and 28: 7.0 The main menu 7.10 Range (dynam
Page 29 and 30: 7.0 The main menu SPECTRAN as an
Page 31 and 32: 7.0 The main menu 7.20 Bright (Set
Page 33 and 34: 8.0 Correct measurement 8.1 Noise f
Page 35 and 36: 8.0 Correct measurement Examples: f
Page 37 and 38: 8.0 Correct measurement large when
Page 39 and 40: 8.0 Correct measurement 8.9 DFT mod
Page 41 and 42: 9.0 Measuring static magnetic field
Page 43 and 44: 11.0 Aligning the sensors Aligning
Page 45 and 46: 13.0 Tips and Tricks “Turbo” sw
Page 47: 14.0 Exposure limits 14.1 Limits fo
Page 51 and 52: 15.0 Connections 15.2 External DC i
Page 53 and 54: 16.0 Typical readouts in practice M
Page 55 and 56: 17.0 Tables Table 5 Gain and corres
Page 57 and 58: 19.0 Spectrum analysis basics What
Page 59 and 60: 19.0 Spectrum analysis basics Back
Page 61 and 62: 19.0 Spectrum analysis basics These
Page 63 and 64: 21.0 Frequencychart Analyzer & Ante

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