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Tire Pressure Gauges - Analog Vs. Digital
Tire Pressure Gauges - Analog Vs. Digital
The purpose of my inquiry, after two months of experience with two digital tire gauges, is not to find out which brands of gauge are better than others, but rather, to find out which type(dial face vs digital) you feel: 1. Consistently gives the same result over and over again. 2. Has the best absolute accuracy(against a known reference gauge) One of my two digital models, a DIYCO Pro, takes 3-5sec. to reach a reading. After dumping it(releasing the air from it when it is removed from a tire), and valving that same tire again two or three more times, I get different readings as much as 2psi apart. IE: first read: 33.5psi, second read, 32.9, third read, 33.2, etc. If I set all my car's tires to exactly 33.0psi, how do I know all four are really exactly 33.0psi(according to a theoretical reference gauge)? With dials, If I keep taking readings, the indicated pressure goes down just a hair with each successive reading, but, I get a reading right away, and bleeding down is fast and no nonsense compared to the digitals, which "slowly climb back"from a bleed: 32.8...32.9.........? .....33.0! Whew, finally! Which do you prefer: Decimal precision of a digital tire gauge that you must wait a few seconds for, or, no- nonsense, quick reading of an analog? And is either really any better? |
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Tire Pressure Gauges - Analog Vs. Digital
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Tire Pressure Gauges - Analog Vs. Digital
Steve W.
I guess more broadly: mechanical/analog gauges more directly measure the tire pressure, vs digital models, which probably use some algorithm to determine the pressure? Again, I've spent two months with more than one digital tire gauge, and after experiencing both their good and bad sides, I'm actually longing for the simplicity of an analog gauge again. I'm hoping the $40-something I'm paying for my yet-to-arrive Longacre Analog 'Deluxe' will show improvements in quality and particularly consistency of reading, compared to the $10 or so I paid, 5 and 10 years ago, for Accu Gage's S60X dial-face model that was my go-to for ten years until recently. |
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Tire Pressure Gauges - Analog Vs. Digital
Steve W. wrote:
- show quoted text - > I;m not real worried if the >tires are 33psi, or 35 psi, as long as they all read the same on the >same gauge. >-- >Steve W. __________ ^This!^ Consistent, repeatable readings. |
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Tire Pressure Gauges - Analog Vs. Digital
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Tire Pressure Gauges - Analog Vs. Digital
Xeno wrote:
>No algorithm needed. They just translate a voltage signal >from the pressure transducer into a digital value. Or they >could use a variance from a reference voltage. Either way, >there is no algorithm, just a translation from one type of >signal to another. ____________ Thank you for that explanation, Mr. 'Plains Dealer'!(BTW that was the name of a midwestern newspaper, not sure if they're still in print). Makes sense, and an interesting point: Both my Longacre and DIYCO digital gauges read HIGH(about 1psi) compared to my Accu Gage S60x dial, and two garages I brought them to for reference. We'll see how my Longacre dial gauge compares to the rest of this fleet, and the garage. |
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Tire Pressure Gauges - Analog Vs. Digital
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Tire Pressure Gauges - Analog Vs. Digital
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Tire Pressure Gauges - Analog Vs. Digital
Amuzi:
This http://www.longacreracing.com/produc...”-Tire-Gauge just arrived in the mail today, and I am most impressed by its heft and construction quality! Compared to my Accu Gage and my digital Longacre, the head unit itself is HUGE - and this is just the deluxe, not the pro version! I would say slightly smaller than a standard tennis ball. Thick red hose, 17" long, solid chuck, this gauge seems almost overbuilt for its purpose in life: Accurately dialing in cold tire pressure on all four tires of a motor vehicle. I went out and checked the pressure of one of my tires with it, and it seems to go effortlessly about returning a reading. And yes, it holds the reading solidly, until I dump it via the bleed valve - which takes about 2-3seconds of holding in the bleeder button. Plus, it glows in the dark for those who need to check a tire out on the road after dark. I called Longacre Racing to find out what kind of design it is(Bourdon vs spring) and the gentleman who answered the phone(right away, no menus "please press 1" crap by the way)confirmed it is Bourdon, as all their analog gauges have been for over ten years. What he was unable to confirm with me was the ANSI(American National Standards) grade this gauge would fall under - AA <0.5%, A <1.0%, B <2%, etc. Never even heard of the department. He did say that the Deluxe is a "3-2-3%" gauge as far as accuracy is concerned: 3% accuracy below 20psi and above 40psi, and 2% from 20-40psi. So for a required reading of IE: 35psi exactly, that's plus/minus 0.7psi. For a reading of 50psi, that's an error of 1.5psi. Supposedly their basic digital gauge is 0.8% accurate, or plus/minus 0.28psi at our example, 35psi, with resolution down to 0.2(one fifth) of 1psi. I just don't like waiting 2-3 sec. for an exact reading! So I'll see how my new Longacre deluxe analog hold up with regards to repeatability. |
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