Ko te parahi he paparanga whakarewa noa i runga i te mata o te poari ara iahiko (PCB).I mua i te whakatau tata i te parenga o te parahi i runga i te PCB, kia mohio koe he rereke te parenga o te parahi ki te pāmahana.Ki te whakatau tata i te ātete o te parahi i runga i te mata PCB, ka taea te whakamahi i te tātai e whai ake nei.
Ina tātaihia te uara ātete kawe kawe R, ka taea te whakamahi i te tauira e whai ake nei.
ʅ : te roa o te kaikawe [mm]
W: te whanui kawe [mm]
t: mātotoru kawe [μm]
ρ : te kawe o te kawe [μ ω cm]
Ko te parenga o te parahi kei te 25°C, ρ (@25°C) = ~1.72μ ω cm
I tua atu, ki te mohio koe ki te parenga o te parahi mo ia waahanga wae, Rp, i nga rereke rereke (penei i te ahua i raro nei), ka taea e koe te whakamahi i te tauira e whai ake nei hei whakatau tata i te parenga o te parahi katoa, R. Kia mahara ko nga ine o te Ko te parahi e whakaatuhia ana i raro nei ko te matotoru (t) 35μm, te whanui (w) 1mm, te roa (ʅ) 1mm.
Rp: parenga mo ia waahanga waahanga
ʅ : parahi roa [mm]
W: te whanui parahi [mm]
t: matotoru parahi [μm]
Mena he 3mm te whanui o te parahi, he 35μm te matotoru me te 50mm te roa, ko te uara parenga R o te parahi i te 25°C he
Ko te kupu, ka 3A nāianei rere parahi i runga i te mata PCB i 25°C, maturuturu te ngaohiko e pā ana ki 24.5mV.Heoi, ka piki te pāmahana ki te 100 ℃, ka piki te uara ātete ki te 29%, ka 31.6mV te heke ngaohiko.
Wā tuku: Nov-12-2021