Quantitative Testing (Absolute Value Measurement) Is Possible With Near-Field Probes - Saluki SER Series User Manual

EMI Receiver Instructions for Use
Figure 4.2 Measuring electromagnetic radiation of PCB board with near-field probe
The above are all relative measurements, and relative measurements can only qualitatively analyze the magnitude of the measured signal.
For example, the radiated emission (RE102) measurement of a certain military equipment exceeds the standard, and at 100MHz, the limit value is exceeded
10dB, in order to meet the requirements of the military standard, this product must be reinforced and improved.
The correct way to strengthen is to measure with a diagnostic probe first, and the signal exceeds the standard at 100MHz.
The magnitude value of the number, measure after reinforcement measures, compare the data of the two measurements, if the second measurement data
The value reduced by less than 10dB compared with the first measurement data indicates that the reinforcement measures are not enough. If the reduced value
If it is greater than 10dB, it may pass the military standard limit requirement. Because the change of the electromagnetic field strength in the near field and the change of the far field
The rules are basically the same.

4.1.3 Quantitative testing (absolute value measurement) is possible with near-field probes

All TEMPEST electromagnetic field probes have been calibrated by nationally certified measurement units, and the corresponding
Probe calibration coefficient AF, with which the field strength quantitative test can be carried out, and the absolute
For the field strength value, such as the electrical field near the transmitter, substation, radio room, computer room, cabinet and inside the case, etc.
Places with strong magnetic radiation.
The calculation formula of electromagnetic field theory is as follows:
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