Re: Dwellometer

["jtrealty@xxxx " <jtrealty@xxxx>]

In the origional automotive application the dwellmeter was used to 
measure how long the points stayed closed as they were rapidly being 
opened and closed. This was a direct measurement of the gap when 
opened as a smaller gap meant it would be closed longer. In the 
Delorean we aren't reading "dwell". What you are actually reading is 
the pulse width of the ac signal going to the frequency valve. The 
larger the pulse width, (the longer it's on) the longer the frequency 
valve will remain open. Since the frequency valve is an on-off device 
the electric is in effect turned on and off rapidly to give the 
different amounts of fuel required. The more it is on the more 
fuel.Now you can see why we can use a dwell meter to read the signal 
to the frequency valve and why it is called such. By the way a rapidly 
changing dc voltage is in effect an ac voltage it just may not be 
sinosoidial, in this case it is a square wave which you would see if 
you scoped it.
David Teitelbaum
vin 10757


--- In dmcnews@xxxxxxxxxxx, "Dave Swingle" <dswingle@xxxx> wrote:
> --- In dmcnews@xxxxxxxxxxx, "Dave Swingle" <dswingle@xxxx> wrote:
> >they can be used to measure the "dwell" of the 
> >frequency valve as noted. The measurement number in this is not 
> >very meaningful, just an indication of working or not working. 
> 
> Should have said "dwell of the computer signal to the frequency 
valve". . . an indication of the **computer** working. . ". This does 
not test the valve itself. Original discussion in message 13001
> 
> Dave