With the VM-16 model, congured using a PV-83 vibration pickup with tri-axial sensitivity, Rion’s vibration level meters became able to measure in three directions simultaneously. The successor model, the VM-51, incorporated a 4-bit microcomputer with digital display accom-panying the analog meter, enabling serial communication with a PC and printing from a printer. Since the advent of this model, trends in digitiza-tion of this instrument have accelerated.The VM-52/52A introduced overall improvements, including the introduction of piezoelectric elements to minimize the effects of sym-pathetic vibration induced in the vibration pickup by contact with the ground. The PV-83B, a compact model weighing less than half of PV-83 while retaining the same sensitivity, was concurrently developed. Then, in response to growing demand for longer duration measurement, a model was developed which could store measurement data on a mem-ory card, together with dedicated application software that allowed users to manage their data using a PC. These improvements made it possible to perform vibration measurement alongside continuous data monitoring.The PV-83C was developed for the VM-53/53A, which featured im-proved surface precision of the piezoelectric elements, resulting in im-proved stability under changes in temperature. The DSP unit installed into the main unit allowed the model to perform digital signal process-ing and advanced arithmetic processing. This meant the model could measure not just vibration levels, but simultaneously record real-time vi-bration data for posterior analysis and perform 1/3 octave band analysis using an optional program. The staff look back on the period in which VM-53/53A was developed.“We were constantly considering the needs of our customers and the market. To take effective measures against on-site vibrations, we believed routine vibration analysis would become increasingly import-ant. We produced a vibration level meter with two LCDs so users could also view the analysis screen at the same time. As for incidents that have led to complaints being led by residents, in most cases the vibrations in question occur about once a day or even less frequently. In response, we developed a system that performed measurements and recording for longer periods, as well as data management software that allowed users to check variations in vibrations using a personal computer and create daily or weekly reports.”The VM-55, a vibration level meter that met the requirements of JIS C 1517 ‘Measuring instruments used in transaction or certication,’ was released in 2015. The device is capable of measuring vibration and vibration acceleration levels, including instantaneous values, hourly rate levels, time-averaged levels, and maximum and minimum values in three directions simultaneously. It also features IP54 waterproof and dust-proof rating.Rion has successively released models meeting foreign standards, including the VM-54, which complies with ISO 8041 ‘Human response to vibration,’ and the VM-56, which meets the requirements of ISO 8041 and DIN 45669-1. These models have been adapted to foreign standards by modifying the arithmetic processing of existing vibration level meters.In pursuit of human perceptionThe notable feature of Rion’s vibration level meters is that Rion has de-veloped and continues to fabricate all of its components, from vibration pickups and the main unit to the application software. Our experience as an industry leader and frontrunner in the pursuit of the human per-ception of vibration is among our greatest advantages over our compet-itors. From the early days of development of vibration level meters to the present, Rion has continued to explore how we perceive vibration and how instruments can be used to make measurements, evaluations, and vibration countermeasures more effective. This core philosophy will guide the future evolution of vibration level meters at Rion, and ensure the company remains a leading force in the market and social environ-ment of vibration level meters.[VM-51] (1988)As the rst vibration level meter equipped with a built-in microcomputer, the VM-51 also featured a digital display. This model was developed based on a design concept of basic functionality and ease of use. Capable of serial communication with a PC and measurement output to a dedicated printer.[VM-52A] (1994)This was the first model equipped with a memory card (SRAM) function for extended data recording. It featured a large LCD and improved usability. The model met the re-quirements of the 1993 amendments to the Measurement Act. (Photo shows a VM-52.)[VM-53A] (2003)This model adopted a memory (CF) card for extended data recording. It had two LCDs for displaying various items such as an analysis screen, level waveforms, and calculated values. The high precision and high stability of this model were realized through digital signal processing.9[VM-51] (1988)
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