Newbie here that needs help. I have a ford factory tach from a pickup and i have installed it in a van, now i need to calibrate it. The ecm outputs are different. Tach sig comes from a hall sensor and is sq wave 6volt dc.
Pickup output from ecm to tach.
650rpm=43hz/+-10hz 6volt
3000rpm=200hz/+-10hz 6volt
Van output from ecm
650rpm=130hz/+-10hz 6volt
3000rpm=600hz/+-10hz 6volt
I need to convert the 130hz@650 to 43hz@650.
I have nat LM2917N-8 for hz to volt and nat LM231N for the convert back from volt to hz. Seems so far i cannot get the hz out to the spec of 43hz@650rpm with 6volts.
LM2917---vtp=7.56xfreq.inxc1xr1////vtp=7.56x130x.02ufx62k
LM231---freq.out=v.in/2.09xrs/rlx1/rtxct////fout=1.9/2x8k/100kx1/6.8kx0.1uf.
My output is .44volt/3.7hz@650rpm
What did i do wrong I'am stumped, Is there another way to change the hz
any help would be greatly appreicated.
BILL
Pickup output from ecm to tach.
650rpm=43hz/+-10hz 6volt
3000rpm=200hz/+-10hz 6volt
Van output from ecm
650rpm=130hz/+-10hz 6volt
3000rpm=600hz/+-10hz 6volt
I need to convert the 130hz@650 to 43hz@650.
I have nat LM2917N-8 for hz to volt and nat LM231N for the convert back from volt to hz. Seems so far i cannot get the hz out to the spec of 43hz@650rpm with 6volts.
LM2917---vtp=7.56xfreq.inxc1xr1////vtp=7.56x130x.02ufx62k
LM231---freq.out=v.in/2.09xrs/rlx1/rtxct////fout=1.9/2x8k/100kx1/6.8kx0.1uf.
My output is .44volt/3.7hz@650rpm
What did i do wrong I'am stumped, Is there another way to change the hz
any help would be greatly appreicated.
BILL