Then you apply a top-off constant voltage until the charging current goes to some very low number around 5% of the amp-hour rating (1.75 amps for the common 35-amp-hour aircraft battery) for the remaining 20% of rated current. Little did I know that in 2012, that sweetheart and I would cross paths once more, with a resultant marriage to her a year later. Jess Meyers of Belted Air Power continues to refine auto-engine conversion firewall-forward packages for homebuilt aircraft. Not only that, the numbers I gave you above are accurate at 25 C (77 F), but higher temperatures mean a lower charging voltage, and lower temperatures require a higher voltage (approximately 3 millivolts per degree C in both directions). Four cycles of discharge-rejuvenate with the HF #63299 did the trick. 4 Channels, 50 MHz Bandwidth ; Now includes FREE software bundle BND-MSO/DS1000Z built into the unit; UltraVision: Deeper memory 12 Mpts upgradable to 24 Mpts via a software key; Up to 30,000 wfms/s Waveform capture rate; HUGE 7'' screen … That makes the price $40, which is what I paid for it. Next is a float voltage, then a slow self-discharge down to a normal lead-acid resting mode. When it hits 12.8 volts at a little before the 5-minute point, the heavy charge takes it up to 14 volts or so. Brake fluid flushing makes money. But that is just a guess, nothing more. All rights reserved worldwide. This will be a first for me. The auto mode, which is intended to keep the battery charged between uses, isn’t a simple trickle charger. This year we've come up with some brand new gadgets and some items that have escaped our attention till now but shouldn't have; a staff report. The “why” comes from chemistry, and while I have quite a few college credits in chem, I make absolutely no claim to completely understand how a couple of lumps of lead in a sulfuric acid2 solution does the batting in the battery box. ters, you’ ll be ready to make fast and accurate oscilloscope measurements. I will tell you that I just about scared the pants off of myself going back into the archives to see what I wrote way back in 2002. It had entered the “auto” mode, where I thought it kept a trickle charge on the battery after it had rejuvenated. No issues so far. Ranges From Full Record Overview To Zoom In Up To Sample Level At Any Record Length, Provides Date And Time Stamp Information For Scope Record, 100 Screen Replay Sequences And For Trend Plot Recordings, Automatic Connect-and-View(TM), Delay, Dual Slope, Edge, Free Run, N-Cycle, Selectable Pulse width (Channel A Only), Single Shot, Video, Video Line, Digital Persistence Off/Short/Medium/Long/Infinite, Traces Fade Ot In Seven Levels, IEC61010 1000 V Cat Iii/600 V Cat IV Safety Rating, Four Fully Isolated Floating Input Channels With Up To 2.5 Gs/S Real-time Sampling Rate, 8ns Glitch Detect, 10, 000 Sample Deep Memory Per Channel for Displaying High Resolution Waveform Details, 4 Trendplot tm Traces, 4 Scoperecordtm Traces, High Capacity Li-ion Batteries Offer Up to Seven Hours Operation, Battery Access Door to Easily Swap out Batteries For Extended Operation, Two Electrically Isolated Usb Ports, Mini Usb-a For Pc Connectivity and a Usb Memory Device Port, Security Slot to Lock Down Instrument Using Standard Kensington(R) Pc Lock, Screw Insert for Standard Camera Mounting Accessories, 100 Mhz or 200 Mhz Bandwidth, Up to 2.5 Gs/S Real Time Sample Rate and Up to 400 Pico Seconds Resolution, Connect-and-viewtm to Easily Trigger on and Display Even Complex Waveforms, Trendplottm and Scoperecord(TM) to Capture or Plot, BC190 Power Adapter, BP291 Double Capacity Li-ion, Battery Pack, VPS410-R Probe Red, VPS410-B Probe Blue, VPS410-G Probe Gray, VPS410-V Probe Green, USB Cable A - B (Mini), Hanging Strap, Side Strap, CD Users Manual With Flukeview, Scopemeter Software Demo Version, Statement of Calibration Practice, Hazardous Material - I couldn’t get it to hold a charge but for about 6 hours, and then it was back to not wanting to turn the prop over. Since I started writing monthly columns in 1977, I have never written about a commercially available product. Check out their web site at www.rst-engr.com/kitplanes for previous articles and supplements. Then the magic pulse comes along to drive the battery up to 14.2 volts again, and we repeat the cycle every 30 minutes (shower, lather, rinse, repeat…) so long as you leave the charger connected. Jim Weir is the chief avioniker at RST Engineering. 50 MHz Digital Oscilloscope with 4 channels plus 12 Mpts memory, 1 GS/s sampling rate. Grainger's got your back. This time, somebody really got it right, and say what you wish about HF, this sucker works. 1 Our Recommended Top 10 Best Professional automotive diagnostic scanner Comparison Table; 2 Most Popular 14 Best Professional automotive diagnostic scanner 2020. His technical advisor, Cyndi Weir, got her Masters degree in English and Journalism and keeps Jim on the straight and narrow. General. Finally you apply a continuous float voltage somewhere around 13.5 volts that simply replaces the leakage current that all batteries have. Enable JavaScript by changing your browser options, and then try again. Scary. This phase is a relatively constant current charge for about 95% of the time and a sharp positive pulse going from whatever battery voltage the battery is charged to, and then a very sharp narrow pulse going up to about 16 volts, ten milliseconds wide, one time a second. Ah, yes, the rebate flight on the new ADS-B Out box. Lo and behold, this little jewel has been programmed with the internal microprocessor to be smarter than a simple trickle charger. Then the charger lets the battery self-discharge to somewhere on the order of 13.5 volts and keeps it there with a relatively low trickle current of about 20-30 milliamperes. 3Using another person’s work as a graduate student is research. Common communication protocols for microcontroller-level devices include. Much more. But wait, there’s more: For both rejuvenation and normal charging, there are three choices to be made. Once the battery voltage gets to about 12 volts, the rejuvinator starts whapping the battery with 12- to 16-volt pulses to break up the sulfation. This image was captured about 5 minutes after the first image. ~Test Instruments~Electronic/Bench Testing~Portable Digital Oscilloscopes, / Supposedly, ... Rigol oscilloscopes are plenty good, say Brian and Carmen, for most home electronics projects. About 9 minutes into the scan, the battery gets to the 12.8-volt point, the charger boosts it up to the 14-volt area, and the whole process starts all over again. Thanks to Mark Hunter for the photo titled “Bosch GSB 16 RE Impact Drill.” Podcast theme music by Paul Stevenson. Having made that caveat, let me confess to having written a battery desulfation column [“The Battery Sulfate Buster”] for KITPLANES in April 2002, and that design worked…sort of. After about 10 minutes of this sort of square, sort of sawtooth wave, the main rejuvenation effort begins. Opening music by John Trimble, and concluding theme by Paul Stevenson. That battery has been tested half a dozen times over the last couple of weeks and it fires right up, just like it did when it was new—14 years ago. Two amps of trickle charge, 8 amps of quick charge, and 15 amps of boost charge. I have a General Tools TS04 which is the same thing as the harbor freight DM600 except a newer revision of the board so it has bluetooth on it. Since my battery chemistry wasn’t any better 15 years ago than it is now, it was strictly by trial, error, and doing basic “research,” i.e., stealing ideas and thoughts from others who had written about desulfation in print3. Battery charging is a science in and of itself. My goal is to take advantage of my Harbor Freight 80A inverter constant-current DC stick welder as the power source. This site uses Akismet to reduce spam. However, it seems JavaScript is either disabled or not supported by your browser. Thanks to Magdalena Roeseler for use of the untitled photo. But when a $40 product1 from Harbor Freight saves me a $300 battery, it is worth writing about. More about that next month. Not unexpectedly, the culture at Carmen’s new job is a bit different from what he experienced in his last position. By Marc Cook. It actually follows the Concorde (and other AGM manufacturers) regimen that recommends a pulse up to the maximum voltage that the battery can take, called the “initiation” mode. Since I started writing monthly columns in 1977, I have never written about a commercially available product. This cycle slowly repeats to keep the battery at full capacity. Not so. About 3 minutes into the scan, the 13.5-volt trickle current goes away, and the battery begins a long, slow decrease to the 12.8-volt point. Lead-acid batteries (be they flooded, gelled, or matted) go through a three-part process in the charging regimen to maximize life. Again, these folks thought this charger through, and it has a “winter” mode that adjusts for colder temperatures. Sign In to access your account information. The oscilloscope presentation of the square wave that brings the battery up from deep discharge. The problem is that I can only write about how it works, not why it works. Sure, sure, just another variation on “sulfate busters” that juice the battery up for a day or two and then let it go flat again. Brian’s friend successfully removed 150 year old paint using a heat gun and a, It’s hard to beat the utility of locking pliers, better known as, For larger scale projects, Brian and Adam find their, Butcher block countertops can be found at, Supposedly, the average electrical drill is only used for a few minutes over its lifetime, although a valid study citation seems, You can compare your desk layout with that of others in the, Carmen alerts us to some well-considered workbench tips from, Although Brian believes no shop is complete without a. Adam opines that one’s first drill purchase should be a corded drill, as it is not subject to changes in battery technology. Brian participates in our round-robin discussion, but it seems his 2016 was fairly routine. each. I related a story about my 1960 high school days and a dead sulfated battery in a ’51 Chevy in the San Diego local lovers’ lane at 2 a.m. with my high school sweetheart. This takes about another 15 minutes. Jim Weir is the chief avioniker at RST Engineering. Aren’t on the HF mailing list? The whole charge-discharge cycle takes about half an hour, which is why I didn’t see it on the first go-around. This was no fluke. Most of the attendees at Oshkosh AirVenture each year seek out the latest, greatest, craziest, most innovative gear they can find, and our KITPLANES crew is no exception. Save my name, email, and website in this browser for the next time I comment. During the past year, Carmen also changed jobs, starting in his first new position since graduating from college. In general, you charge a battery to about 80% of capacity with a constant current for 3 to 6 hours until it gets to about 14.1 volts. You have entered an incorrect email address! Access My Account, Order History, Lists and more here. Every month or so, their latest flyer comes in the mail, and it generally has a 20%-off coupon for anything in the store…including this charger.
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