[quote=", post:10, topic:16252"]
I remember I read it in the user manual that this switch controls the switch over time.
I would disagree here, even APC UPS is providing modified sine wave. The actual difference is in the filtering of output harmonics.
This button is designed to alter the capability of charger. If narrow mode is selected, charger keeps charging batteries to the voltage as low as 180 volts. If wide range is selected, charger charge batteries to the voltage as low as 90 volts. This feature is especially designed for Pakistan as here, there is huge voltage problems in villages and many areas of cities.
Homage ups produce very spiky modified sinewave current but modified sinewave current produced by apc ups are much better than the current produced by homage. There are different types of modified sinewave current. Moreover, modified sinewave is not a good choice for expensive electronics. Networks, serves etc are made run on pure sinewave inverters/ups worldwide. Not sure about pakistan.