Ko ngā pūnga hau-whakamatao kei waenga i te 750V ~ 3000V, he mea rongonui mō te whakahāngai i te ara iahiko o ngā oumu whakamahana hiko. Ko te auau whakamahana hiko tae atu ki te 3Khz.
Ka whakaratohia e mātou ngā otinga ritenga ki te whakatau i te ngaronga pūngao me te whakapai ake i te whai huatanga o te pūngao mā te whakamahi i ngā pūnga whakawera arataki wai-whakamatao/hau-whakamatao.