reading a Knock Sensor

[Programmer]

>> Apparently not. Just one crystal in the KS.
>
>?. Don't it ground to the block?.

To measure the output--yes, you need to measure
from the threads and the centre single output. You can
totally teflon these things up and they'll still create an
AC voltage at knock. When mechanical pressure
is applied to the crystalline structure, it produces a voltage
proportional to the pressure--squeeze, if you will.
A magnetostrictive knock sensor is different--I believe that
type has a magnetic coil and works like a microphone...not
a piezo type. I know you test a magnetostrictive KS with
an ohm meter--so it suggests a coil in the sensor.

>blam<

>My point exactly, in your first post you just mentioned squeeze the
crystal<<

Squeeze, push, pressurize, hammer--whatever. It's the force or pressure
exerted against the crystal.



>> >> From: Bruce Plecan <nacelp at bright.net>
>> >> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>> >> Date: October 11, 2000 9:50 PM
>> >> Subject: Re: reading a Knock Sensor
>> >>
>> >>
>> >> >Wouldn't it be shaken or squeezed?
>> >> >Bruce
>> >> >
>> >> >
>> >> >----- Original Message -----
>> >> >From: "Programmer" <nwester at eidnet.org>
>> >> >To: <gmecm at diy-efi.org>
>> >> >Sent: Monday, October 09, 2000 9:26 PM
>> >> >Subject: Re: reading a Knock Sensor
>> >> >
>> >> >
>> >> >> I thought the more you "squeezed" the crystal,
>> >> >> the more voltage output ?
>> >> >> Lyndon.
>> >> >> -----Original Message-----
>> >> >> From: Roger Heflin <rah at horizon.hit.net>
>> >> >> To: gmecm at diy-efi.org <gmecm at diy-efi.org>
>> >> >> Date: October 8, 2000 9:42 PM
>> >> >> Subject: Re: reading a Knock Sensor
>> >> >>
>> >> >>
>> >> >> >
>> >> >> >
>> >> >> >On Sun, 8 Oct 2000, Keith wrote:
>> >> >> >
>> >> >> >> I know i can get the Voltage but what does that convert to??
more
>> >> >> >> voltage = more knock???
>> >> >> >> how much is too much.?
>> >> >> >> Thanks
>> >> >> >> Keith
>> >> >> >>
>> >> >> >It does not convert.   The knock sensor is simply a microphone,
>> >> >> >everything that determines if the noise is knock is in the
>> >> >> >electronics.
>> >> >> >
>> >> >> >Most of the electronics just do filtering and measure the amount
of
>> >> >> >power in a certain frequencty band, and this supposely differs by
>> >> >> >engine and placement of the sensor(s).
>> >> >> >
>> >> >> > Roger
>> >> >> >
>> >> >>
>> >>
>>
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