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Tech Area => General Buick Tech => Topic started by: Scoobum on July 21 2017, 10:39:00 PM

Title: SM vs PL High Gear 02 Readings
Post by: Scoobum on July 21 2017, 10:39:00 PM

Recall on SM tonite showed 823...while PL checked in at 803. Any reason for the difference?

Title: Re: SM vs PL High Gear 02 Readings
Post by: Steve Wood on July 22 2017, 09:20:14 AM

probably something to do with the sampling rate

Title: Re: SM vs PL High Gear 02 Readings
Post by: Scoobum on July 22 2017, 09:21:10 AM

Thanks Steve

Title: Re: SM vs PL High Gear 02 Readings
Post by: Shimy87 on July 25 2017, 10:40:46 AM

when I'm tuning mine seldom show the same numbers either?

Title: Re: SM vs PL High Gear 02 Readings
Post by: Scoobum on July 25 2017, 11:35:47 AM

Quote from: Shimy87 on July 25 2017, 10:40:46 AM

when I'm tuning mine seldom show the same numbers either?

Steve explained it in another thread. The ALDL port samples at 1.5 times per second...while PL is 5 times per second. I hit recall on the SM at the end of a run for KR...but I use PL for 02's in regard to tuning.

Title: Re: SM vs PL High Gear 02 Readings
Post by: Steve Wood on July 25 2017, 12:06:24 PM

Quote from: Scoobum on July 25 2017, 11:35:47 AM

Quote from: Shimy87 on July 25 2017, 10:40:46 AM

when I'm tuning mine seldom show the same numbers either?

Steve explained it in another thread. The ALDL port samples at 1.5 times per second...while PL is 5 times per second. I hit recall on the SM at the end of a run for KR...but I use PL for 02's in regard to tuning.

Let me rephrase that.  The ALDL port updates the SM approximately once every 1.5 seconds.  The PL updates a bit over 22 times per second.  The SM when connected to the PL instead of the ALDL port, updates 5 times per second.  Bob chose that rate because the eye has a hard time seeing change faster than that.