標題: ERT-300 / 張力計 [列印本頁] 作者: henrylin424 時間: 2011-6-30 11:21 標題: ERT-300 / 張力計 本帖最後由 henrylin424 於 2011-6-30 13:54 編輯 1 m; y% ~: [( \+ a p" h4 M3 {4 P; t" Q/ v5 M 網球拍線張力測試器ERT 300(開箱) 6 o# E# o% a5 y3 s* E2 v$ }ERT 300 Manual 8 i7 [1 Q8 ~0 f; W- G" g# XThe right tension for every type of player $ ^" b2 j* @2 F- ^0 c2 y/ ^5 _' b. [% B# m# G
Dynamic Tension DT ( DT-value) / DT is the string bed stiffness - A4 f- {' ~7 P0 L$ l- C; EDT is ball power in kilo pond required to depress the string bed 1 cm at the sweet spot(ball impact) ; x0 s6 f" ^/ E& k W$ H0 T2 ]# @DT determines the playing characteristics power and control. q; ?9 T6 }. R$ n8 P4 N9 QHigher DT for more control / Lower DT for more power, L9 m; z+ D" ], j4 w
Not recommended to play tennis when DT below 28 3 f9 F5 a) h9 ^# f3 h6 |- l9 eRestring the racquet when the DT-value has decreased by 10% to 20% 8 ^( L- M% B# M9 q8 G, r1 {+ O& J7 m 6 f, R) u* T: S2 j0 o: i# QLo DT 28-34 Defensive play / Club( s* p9 R+ H! ]& b; _& `, @0 c
Mid DT 35-41 Dynamic,offensive play / Club,WTA0 e, u8 l2 \5 H8 ]4 A
Hi DT 42-46 Fast,aggressive play / Club , WTA , ATP5 z/ ~3 w! S4 a8 w# O
Hi+ DT 47-54 Very fast,extremely aggressive play / ATP ' s E) P3 [% x2 m4 N6 ]6 ` # B, k7 h# u* S2 lWithin the first 2 to 4 hours after stringing, there is often a remarkable tension loss of 2 to 4 DT , called stabilization losses., U% S5 |& x* a4 ?1 R