• It will log samples for [“Measurement time”] minutes.
• The measurement will stop automatically and the alarm will sound. The
device will calculate the average, display it on the screen and store the
data in the memory.
The measurement can be stopped pressing the “STOP” button.
6.1.1.2. Low frequency time domain measurement with WP50, WP400 or
WP400-3 and WP10M
With this type of probe, other additional functions are available:
• FIELD: electric (E) or magnetic (H) field.
• LIMIT: select the standard to apply.
• None: no weighting will be applied and the measurement will be displayed in
the desired units.
• One of the limits: the measurements will be weighted in accordance with the
chosen limit and result displayed as a % of that limit (over 100% means the
limit is being exceeded).
When a limit is activated with the WP50 probe, an analogue filter is applied
related to the selected limit. With the WP50 probe only two limits can be
selected: ICNIRP 2010 public and ICNIRP 2010 workers. The figures are
shown as an RMS value, a % of the selected limit or in the selected units if no
limit is chosen. The WP50 probe is not suitable for analysis of pulsed signals
because it is not equipped with the peak analysis function described below.
With the WP400, WP400-3 and WP10M probes, when a limit is activated, the
weighted peak method is applied, as described by ICNIRP and recognized as
the most suitable method for analysing complex non-sinusoidal and pulsed
signals. In this case, the main value displayed is the % of the peak field value
compared with the selected limit. The RMS value is also given. As a rule, at low
frequencies the standards limit the peak field value, which is the one most likely
to exceed the limit, although verification of the RMS value is also requested. If
no limit is selected, the main value displayed by default is the RMS value, and
the secondary value is the peak value. Please see Appendix 4 for more details.
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