Reprogramming with Battery Power Supply — How Much Noise is Acceptable?
We recently took delivery of a new Midtronics GR8 Diagnostic Battery Charger and I noticed that it had an ECM mode for maintaining system voltage during extended diagnostics and or reprogramming events. I thought cool, perhaps we should take an inventory of the voltage levels with the scope from all the devices we have in the shop (battery chargers and maintainers) so we have performance visuals for each of the devices we own. (I figured this would also be a good learning tool for our staff)
We commissioned a test and collected the following results along with the raw data Picoscope data which we've included below for anyone interested. The following image shows our test set up and includes all the devices (except for the ancient Snap on charger). The Iota and PowerMAX devices are clear winners here and will continue to be our go-to device for reprogramming and extended diagnostic operations.
Snap On YA-167B - Low Charge Mode
Snap On YA-167B - High Charge Mode
Midtronics GR-1 - Low Manual Mode
Midtronics GR-8 - ECM Mode
PowerMAX PMDC-55 - Maintainer Mode
Iota DLS-75 - Maintainer Mode 13.5v
What is the acceptable amount of noise one should allow for when performing critical steps such as reprogramming on today's vehicles?
Keith Perkins and I had similar results with the iota and the powermax. I would have liked to see the shumaker 70amp unit.
Hi Justin, Swing on by one day and we'll test it out. ;)
Justin - I have one at the shop if someone doesn't beat me to it I will try and get a capture and upload it on Monday. I am curious too.
We have a Schumacher unit. it is the DSR labelled INC-700A if I remember correctly. On the scope in programming mode it is as clean as the Iota and powermax units as long as you keep it away from maximum amperage. It gets dirty when maxed out. It will go to almost 80 amps when pushed hard. I would not recommend or purchase this unit as it has failed twice, the first time 2 days out of warranty…
I have one of these units Rick. It failed me when it failed to light up the display when plugged in. No ammount of button pushing would get it to turn on. It was sent in for repairs. Sent back to me with no communications weeks later. No note or anything. Still no go. I purchased through Aeswave so I called the boys there. They got ahold of someone there and it was sent back in again. Several
I have heard that the DSR unit is very unreliable, very unfortunate because it seems like a good value based on features and price.
I’d have expected better results with the GR-8 🤔 I use an Iota. Thanks for for taking the time to do the testing and put up results.
Nicely done. And the answer to the question is?? Minute, Zilch, Notta, 0, ?
Good morning, Scott. The question might be asked "what is the acceptable level of 'noise' that an OEM allows. The GR8 is interesting as to what kind of filter they've incorporated. It looks like they and snapon are using full wave rectification. You can still see it on the GR8's ecm mode. If I had that one at the house, I might try capping it and measure the voltage at the battery both with and
Hi Ed, Perhaps my test wasn’t scientific enough as I did not have any loads applied. In hindsight, perhaps a followup test is in order.
load would matter as well as battery health. I have seen poorbattery condition effect the test. If you do this again Scott, use a known bad battery and a known good battery on the same load. Maybe force a cooling fan on high. Capture with an amp clamp on the charging cable to show the charge rate.
Ed, I don't have anything published but was told by several OEs that 0.3 volts AC was considered the maximum acceptable noise. I stuck with that as my rule because a correctly functioning alternator is below that spec. as well. We do programming recovery work for shops who have issues. I have had several shops using traditional battery chargers which when checked have been putting out between 8
Interesting. Now i feel i need to scope with my TiePie how our Fronius Acctiva Professional Flash responds. I just have to satisfy the curiosity this has sparked to me. This "maintainer" , we call them "battery multi-function tool" has always performed great and has been a true workhorse for over a decade to many workshops locally. Plus it has been approved and used by many OEMs for quite a
This afternoon I had a battery charger hooked up and I grabbed a waveform while it was charging. This is a Solar PL2320 20 amp. diag.net/file/f73w1nr89…
Thanks Albin. Great Capture to help answer what would be the Norm?
Here's a shot of one of our GR-8's in Power Supply Mode diag.net/file/fwrbs6qe1… diag.net/file/f47z5e02u…
Here's two that I have in the shop. These were connected to the same vehicle one at a time. The headlights were on with an approximate 23 amp load. I use the AE100APS most of the time and although I was surprised to see the level of ripple, I have not had any issues programming with it. AEtools AE100APS Midtronics PSC-550