L
Lance Morgan
- Jan 1, 1970
- 0
I recently scoped the Hall-Effect sensor on my 91 Saab 900 (4 cyl,
electronic ignition w/one coil, distrib, rotor), which has an
narrow-band RPM related bucking problem
The pattern _appeared_ to be good to my untrained eye - just wanted to
ask about one possible glitch
It essentially looks like the lower horizontal trace pair here
www.tequipment.net/LeaderLS8022.html
[my new/used scope is a very similar predecessor of the above, btw,
and am using 10:1 passive probes]
Quite consistent square corners (the vertical portion of the trace is
missing, but I've been somewhat reassured that that's normal, given
the short time of the switching event), w/some horizontal
movement/creeping corresponding w/RPM changes.
But occasionally I get an clear/abrupt horizontal/left-to-right(?)
shift
Is the square pattern all's that really important (input Vref is
stable), to ck a H-E sensor, or should the immed above be cause for
concern?
If not, I plan to proceed to getting some other appropriate probes to
run the ignition system (knock sensor appeared to be good, but may
also need to get some 1:1s to see better)
electronic ignition w/one coil, distrib, rotor), which has an
narrow-band RPM related bucking problem
The pattern _appeared_ to be good to my untrained eye - just wanted to
ask about one possible glitch
It essentially looks like the lower horizontal trace pair here
www.tequipment.net/LeaderLS8022.html
[my new/used scope is a very similar predecessor of the above, btw,
and am using 10:1 passive probes]
Quite consistent square corners (the vertical portion of the trace is
missing, but I've been somewhat reassured that that's normal, given
the short time of the switching event), w/some horizontal
movement/creeping corresponding w/RPM changes.
But occasionally I get an clear/abrupt horizontal/left-to-right(?)
shift
Is the square pattern all's that really important (input Vref is
stable), to ck a H-E sensor, or should the immed above be cause for
concern?
If not, I plan to proceed to getting some other appropriate probes to
run the ignition system (knock sensor appeared to be good, but may
also need to get some 1:1s to see better)