yes, my points of view on scopes is from the base line of real scopes with 300v and 600v rated inputs. (TEKtronix here)
Cheap scopes can be as low as 5vdc max, and blow out at the drop of a hat. and use a voltage divider fixes that but really a 10x probe is just that.
The problem is coils of wire, and cars are full of them, solenoids and relays, look, at the AC Clutch and see 400vdc EMF. kick backs, it does.
so just know that and not blow up any scope, for sure low end.
the frequency on all 91 to 98 sidekicks is 200 Hz. (or 200 cpS using 1960s jargon)
F = 1/T (time is from 0v to 12v and back to 0v a full cycle not 1/2) 1mS/div and 5 mS total F= 1/t 1 divided by .005 = 200 hz
the frequency does not change ever only the duty cycle. and with the scope we set it 50/50% 2.5 high and 2.5mS low. low is closed no air flows. (from it)
![[Image: iac-wave1w.jpg]](https://fixkick.com/IDLE-AIR/iac-wave1w.jpg)
Cheap scopes can be as low as 5vdc max, and blow out at the drop of a hat. and use a voltage divider fixes that but really a 10x probe is just that.
The problem is coils of wire, and cars are full of them, solenoids and relays, look, at the AC Clutch and see 400vdc EMF. kick backs, it does.
so just know that and not blow up any scope, for sure low end.
the frequency on all 91 to 98 sidekicks is 200 Hz. (or 200 cpS using 1960s jargon)
F = 1/T (time is from 0v to 12v and back to 0v a full cycle not 1/2) 1mS/div and 5 mS total F= 1/t 1 divided by .005 = 200 hz
the frequency does not change ever only the duty cycle. and with the scope we set it 50/50% 2.5 high and 2.5mS low. low is closed no air flows. (from it)
http://www.fixkick.com