Special functions of the WP400 and WP400-3 probes
These probes have certain specic functions, given their spectral analysis
capacity.
• RANGE: Select how the probe will adapt to eld levels. With changes in levels,
the electronics processing the signal must adapt to high or low levels in order
to give accurate results under both conditions. That adaptation takes time,
which needs to be taken into account in special cases.
•
Automatic: the measurement range of the probe adapts automatically to the
signal, with either increase or decrease in the level. Suitable in most cases.
•
Auto-increase: the range will only increase, adapting to higher levels
detected and maintaining those conditions for accurate immediate reading
of high levels. This is very important in the case of signals with non-
repeating high levels, e.g. signals with sporadic peaks (at intervals of more
than one second). If they are very fast and short with high levels, the device
might not have time to adapt to the rst pulses and could measure a level
lower than the actual level. If this function is activated, the device will already
be adapted to measure the following pulses correctly. This function could be
useful, for example, to measure pulses generated by welding equipment.
• FILTER: Select the high pass lter
• 1 Hz. No lter is applied. Using this option requires special care. In this
mode all operations are slower due to the integration time required for
having the RMS value at 1 Hz. The device will take longer to adapt to
changes in the eld, so any movements must be slower or the device
should remain still for several moments at those positions where you want
to take a reading. Another effect is that if a static eld is present and you
take measurements moving the device, that movement will make the probe
detect the eld as dynamic and it will contribute to the end result. In both
cases, we recommend using a tripod and keeping anyone at a distance
when taking measurements.
• 10 Hz (-3dB at 10 Hz). Recommended if you know there are no signals
under 10 Hz (true in most cases).
• 25 Hz (-3dB at 25 Hz). To attenuate readings below 25 Hz.
User’s Manual Electromagnetic Field Meter SMP2 P. 79
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