( ( While measuring ) ( , ( ( touch ( a grounded ) ) ( ( ( object frequently ) ( to ( avoid ( ( ( too much ) buildup ) ( of charge ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (IN While) (S (VP (VBG measuring)))) (, ,) (NP (RB touch) (DT a) (NN grounded)) (VP (VBP object) (ADVP (RB frequently)) (S (VP (TO to) (VP (VB avoid) (NP (NP (ADJP (RB too) (JJ much)) (NN buildup)) (PP (IN of) (NP (NN charge)))))))) (. .)))
While measuring, touch a grounded object frequently to avoid too much buildup of charge.
(ROOT (S (NP (NNP Grounding)) (VP (VBZ is) (SBAR (WHADVP (WRB when)) (S (NP (PRP you)) (VP (VB touch) (NP (DT a) (JJ charged) (NN object)) (PP (TO to) (NP (DT the) (NN earth))))))) (. .)))