哥们,帮我看看二手UPS.

杭州半桃红一家电子电器店买的,我当时认准是洋垃圾才有兴趣,打开看时,发现内部较大一只工频变压器,4只场管UBZ11A作输出不带电池.在线使用性能较稳定,内有继电器作稳压调整,使输出保持在220v左右.自动跳转逆变,电池不足时保护关机等全方位保护.
有图:

img]/bbs/u/31/1121653546.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20[/img]
小弟又不明白之处是:1.此机的逆变效率如何?我知道它是较早产品.
                    2.波形像方波又不像?
(诸位别笑话,我的工具是捡来玩具.)
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