ISO 8041-2:2021 pdf download – Human response to vibration — Measuring instrumentation — Part 2: Personal vibration exposure meters.
5? Performance? specifications 5.1 General characteristics 5.1.1 Common characteristics A personal vibration exposure meter (PVEM) is a vibration measurement system meeting the relevant requirements of ISO 8041-1 with the additional capability to monitor personal exposures up to a full working day. Since personal vibration exposure meters are instruments capable of measuring and computing daily vibration exposures they are simple to use and implement (internal complexity hidden from the user) and automatic (i.e. they do not require manual post-processing or computations), while displaying accurate and reliable results. Hence, as compared to general-purpose vibration meters, PVEM shall run algorithms that replace as much as possible any required manual signal post-processing. Particularly, one design goal is to identify measurement events or periods that might need to be rejected and that could be automatically discarded from the vibration exposure computation using artefact rejection algorithms. Those automatic artefacts rejection algorithms are an additional feature of PVEM as compared to general-purpose vibration meters. In operation PVEMs are typically left unattended. 5.19 to 5.24 give additional recommendations and specifications for PVEM. The PVEM may consist of separate parts (see parts A and B in Figure 1). Part B of the PVEM provides the means to present the results of measurements. The presentation of results may be in any suitable form, e.g. continuous “live” display or upload of measured values to a dedicated displaying unit or a computer at the end of the measurement period. Part B is an inherent part of the PVEM and compulsory for a pattern evaluation and periodic verification of the PVEM.
The facility for reading measurement data from the instrument may be a direct display on the instrument or a remote display, or both. Where the PVEM provides alarms for exposure exceedances, then the manufacturer shall provide information on the conditions for the alarm trigger points and on any capability to adjust the exposure trigger levels. The reference vibration signal values and reference frequencies are given in Table 1.