WAVECONTROL SMP2, Руководство пользователя

Страница: 38 / 97

• 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
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 and WP400-3 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.
User’s Manual Electromagnetic Field Meter SMP2 P. 36