Reprogramming with Battery Power Supply — How Much Noise is Acceptable?

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.

Old post but I thought I'd put in one favourable user review on the Schumacher (DSR) INC100. I bought it in August 2018, so it doesn't have many years on it yet. However, it does get used daily as both a voltage maintainer for diagnostics and programming, as well as a battery charger when needed. So far, it's been fantastic. For what it's worth, I purchased it because the Snap-on D-TAC Elite…

I will always respond to any Schumacher post. They will never get another dime from me. Why? Because they have terrible customer service. I had issues with my 70amp unit. Sent in to be repaired. Came back with no communication, no note, just the unit returned. Still not working. I had it sent back in only to have it sent back same as before no communication at all. No note. This time it would…

That's exactly how I feel about Snap-on. Except I've been screwed by many of their products over the years. I can only speak for the one I have, and it's been good. I will promise one thing: if it fails me, I'll post all the gory details here for all to see. EDIT: That is by no means a comment on your or anyone else's experience. I hate poor customer service, and I'm disappointed to hear that…

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

Scott, Great test! The PowerMax and Iota look fantastic. Other metrics that would be good to compare would be response times and voltage deviation when a sudden, high-current load is introduced. Cooling fan is a good candidate for measuring response times, but motor start-up loads are inconsistent. Measuring any variation in system voltage as a response to the load would be difficult to…

Thanks Scott, That is a really great Job. Just a question to you or the group. Has anyone viewed for noise on the can or network signals while running the power supplies under load. I had noticed someone on another site making certain claims but take such with a grain of salt over a trusted and experienced point of view. I have not had a chance to scope any power supplies but does anyone…

Hi Dave, I haven’t sampled that data but if I get the chance I’ll have a look and let you know what I find.