Dear Volker

I have very limited knowledge in this area but will respond in case my experience may be helpful. I am not familiar with German suppliers but an EATON UPS was supplied with our SEM. Perhaps the TEM manufacturer could recommend a UPS supplier in your area.

Our selection of UPS size was based on:

Power supply & phase required by EM and supply available (ie power in and out of UPS); requirement to maintain vs "clean" power supply; duration of interruptions previously experienced (or expected).

Keep in mind that the TEM may have in-built auto-shutdown triggers for power interruption which will be overridden by the UPS. It is helpful to understand how the UPS may affect the way the TEM will shutdown.

Hope this helps

Naomi

In Brazil we have a lot of problems with electricity supply. In the TEM laboratory, a standard battery pack and alternator is used as UPS. That means, from the mains the power goes to the rectifier, then for the batteries, then for the alternator and then for the TEM. It filters some of the variations and noise in the electricity line. Still, in the TEM, one can see variations in case of heavy rain. Still, I feel that to avoid instabilities, it is very important to have a good ground installation. Therefore, all equipment linked to the TEM is connected to the UPS, even accessories (EDS, EELS, etc) and all computers and so on.

Dear Naomi, Dear Luiz

Thank you for your messages. Your experience is important for me to prepare a good solution!