[Diy_efi] Re: Diy_efi digest, Vol 1 #347 - 5 msgs

[Bill Washington]

Adam,
    Resistor aging depends on many factors:
1. type of resistor (IE construction - Carbon composition, Carbon film, 
Metal film, wire wound, etc)
2. how close it is operated to its design limits, particularly average 
power and voltage limits
3. physical environment - temperature, atmosphere (corosive, 
contaminants, etc)
4. electrical environment - spikes (istantaneous power transients)
5. time
6. etc
There is no easy answer - it depends on the individual application - the 
particular car sensor layout and location where the car is (death 
valley, Brazilian jungles or Toronto), etc, etc.
Get the picture?
And then the manufacturer provides no info to Joe public to tell us what 
it should be! same story as with the NTK-Honda WB O2 sensors!

Good luck
Bill

Message: 4
Date: Wed, 6 Nov 2002 11:36:45 -0800 (PST)
From: Adam Wade <espresso_doppio at yahoo.com>
Subject: Re: [Diy_efi] Re: Diy_efi digest, Vol 1 #343 - 8 msgs
To: diy_efi at diy-efi.org
Reply-To: diy_efi at diy-efi.org

--- Bill Washington <bill.washington at nec.com.au>
wrote:


>> I would be more concerned about aging of the other
>> resistors in the bridge because they will affect the
>> static balance current, therefore the temperature of
>> the hot wire, therefore the degree of cooling any
>> given airflow causes, and therefore the current
>> change to balance it out and the current change is
>> what is used to determine the airflow!
>  
>

>> Any comments?
>  
>

I hadn't thought of that.  :D

Yeah, I would be more concerned in the same manner. 
Although at what age would you become worried about
component drift in something like a resistor?

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |

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>size?
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