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It is not essential to take on-site measurements but this process can be useful when the status of a site is unknown. Sometimes it is more economic to just experiment with a known good filter such as a CVT.
Advance can also provide ac mains monitors for checking of local mains supplies. Our monitors check the incoming supply against various voltage and noise thresholds which are adjustable by the user. Some other environment data can also be recorded such as the temperature. Results are normally printed out but can be RS232 linked via a modem to a remote site.
Over the years we have had some problems with various monitors providing misleading results. Care must be taken to evaluate the results obtained against reasonable expectation for the site. Common pitfalls include using the same monitor to measure the input and output of a filtering device. This results in the noise spikes bypassing the filter through the monitor! Sometimes there is a very poorly defined line between cause and effect.
On particularly bad sites we have eventually connected a conditioner to a simple resistive load on the secondary of our conditioner and monitored the voltage across the load. This removes the chance of extraneous noise data coming from an unknown load situation Such practice can also alleviate the problems of mains difficulties being mixed with unrelated data corruptions and failures due to other causes.
The application must be reviewed for some basic parameters before we can quote for the supply of a suitable unit. In addition background information can be very helpful in choosing the right technological solution.
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