RAC68
Darth Vader
Offline
Hi All,
A good while back, I replaced a capacitor in my Smiths tachometer as it had obviously failed (cracked apart) and I was reading high. Recently, I compared my readings with a friends hand held unit and the comparison seemed to indicate I was again reading a few hundred RPM high again. Since I had also converted the gauge to neg. ground when replacing the capacitor and also drilled a hole in the case to access the potentiometer, want to calibrate the tach, I understand there is a laptop program that, with the correct cables, will generate the frequencies to accurately transmit frequencies representing specific desired RPM settings for the inductive pickup of the gauge to read and be adjusted to.
1. Does anyone know of this laptop program and where it can be downloaded?
2. Does anyone know how the cables are made up and attached from the Laptop to the gauge?
In my search, I read an article that suggested using a 60-cycle AC florescent lamp and a piece of white tape attached to the crank pulle, you would see 4 marks standing still at 1800 RPMs and 3 marks at 2400 RPMs. Although I don't doubt this would provide good comparisons to adjust the gauge to, I would rather have greater accuracy at 1000 RPMs and 5000 RPMss well as 3000 RPMs.
Any suggestions or input?
Ray(64BJ8P1)
A good while back, I replaced a capacitor in my Smiths tachometer as it had obviously failed (cracked apart) and I was reading high. Recently, I compared my readings with a friends hand held unit and the comparison seemed to indicate I was again reading a few hundred RPM high again. Since I had also converted the gauge to neg. ground when replacing the capacitor and also drilled a hole in the case to access the potentiometer, want to calibrate the tach, I understand there is a laptop program that, with the correct cables, will generate the frequencies to accurately transmit frequencies representing specific desired RPM settings for the inductive pickup of the gauge to read and be adjusted to.
1. Does anyone know of this laptop program and where it can be downloaded?
2. Does anyone know how the cables are made up and attached from the Laptop to the gauge?
In my search, I read an article that suggested using a 60-cycle AC florescent lamp and a piece of white tape attached to the crank pulle, you would see 4 marks standing still at 1800 RPMs and 3 marks at 2400 RPMs. Although I don't doubt this would provide good comparisons to adjust the gauge to, I would rather have greater accuracy at 1000 RPMs and 5000 RPMss well as 3000 RPMs.
Any suggestions or input?
Ray(64BJ8P1)