Hi Milosz, Thank you for the links. This lead me into another bout of furious researching and I found quite a lot of interesting things. In the UK I can get some backpinning probes which interface into 4mm banana plugs. I couldn't find the fuse buddy here at a feasible price, will try to make some perhaps, a source for the connectors used on the ones at the bottom of the picoauto page would be great, specially the ATC one, as I can see other applications for them: http://www.picoauto.com/accessories-breakout.html The injectors I came across at the moment are the high impedance type but in all this occasions they don't have a Vbat line to them, they have the two connections going back to the ECU. I now built a test assembly using a spare injector connector and a couple of blade connectors, something similar to this one: http://www.picoauto.com/break-out-lead.html Interesting enough I found this commercial one after I built mine, so I can honestly say I am not copying their design :-) I am giving it a try tomorrow on my own car, to have a look at the waveforms. I am using a scope with isolated channels to minimise problems, and I have a fluke DC current probe from work, will report back. I am rapidly getting to the conclusion that the breakout box is not such a good idea, the break out leads and the current probe suggested by James is probably the way to go. Thank you all. Best Regards luis On 3 March 2015 at 21:36, Kardasinski, Milosz wrote: > Luis, > > A current probe on the Vbatt feed to your injectors would allow you to > monitor all injectors. Upstream of the wire harness splice or a "Fuse > Buddy" installed in the distribution block. Delayed sweep, to zoom, on a > particular injector current waveform. Measuring control voltage, a "T-Pin= " > makes it easy to back probe a weather tight connector without damaging th= e > seal or pin. > > I'm assuming you work mostly with High Impedance injectors? > > T-Pin > http://content.etilize.com/900/11960698.jpg > > Fuse Buddy > http://www.esitest.com/img/307M-308B.jpg > > -MK > -----Original Message----- > From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf > Of Luis Moreira > Sent: Monday, March 02, 2015 10:51 AM > To: Microcontroller discussion list - Public. > Subject: RE: [EE] Injector Testing > > Hi Guys, > Thanks for getting me in the right direction. There's more to the injecto= r > signals than at first tought... and like James said there is a lot of inf= o > in the current waveform. > The breakout box will be useful but not the way I was thinking in the > beginning, it will be convenient in some cases to get all the injector > signals accessible as getting to the connectors is a pain. > thanks > Luis > On 1 Mar 2015 22:13, "Luis Moreira" > wrote: > > > Hi James, > > Do you have any links that show what you mean? When you talk of rise > > time is that at switch on? And peak current the same? > > There are LEM products that measure DC, I use them all the time at my > > current job. > > Best Regards > > Luis > > On 28 Feb 2015 17:56, "James Holland" wrote: > > > >> > From: Luis Moreira > >> > Subject: RE: [EE] Injector Testing > >> > >> > Hi James, > >> > Not quite the question I was asking, I have access to plenty of > >> > tools > >> like > >> > that one at the moment. In fact I use one like that from fluke all > >> > the time, I also have some tektronix ones. > >> > I am more interested on the manner of the testing. > >> > I deal mostly with 4 cylinder vehicles and although I intend to > >> > expand > >> this > >> > test setup to 6,8 or even 12 cylinders, this is ideal to get the > >> > measurements into a four channel scope, which will show the four > >> injector > >> > signals and timing in relation to each other. In my opinion in one > >> > go I could get quite a lot of info just from this. The breakout box > >> > would > >> allow > >> > me to observe the injector signals with them still connected to the > ecu. > >> > Observing the current would also give me info on injector > >> > resistance and any other issues. > >> > As an example, I am looking at a Vauxhall Vivaro, which had a > >> > confirmed faulty injector changed. After they changed it, the > >> > problem is still > >> there > >> > and instead of a cylinder X miss fire I get a intermitent injector > >> control > >> > short circuit fault. I suspect the bad injector may have damaged > >> > the ECU output driver stage/current sensing circuit, but before I > >> > send the ECU > >> for > >> > repair I need to reassure myself that the rest of the circuit > >> > (wiring,connectors and injectors) are fine under load, Now getting > >> > to > >> the > >> > injectors on a van like this is a pain and I only want to remove > >> > all the bits to get to them a couple of times. With a breakout box > >> > I would get > >> all > >> > the info at once. > >> > As I haven't found any setup like this I am just wandering if this > >> > as > >> worth > >> > while thing to persue. > >> > Thank you. > >> > Luis > >> > On 27 Feb 2015 18:10, "James Holland" wrote: > >> > > >> > >> The breakout box is a good idea but I don't see a big advantage of > >> having multiple current probes. It should be pretty easy to spot a > >> bad injector from its current waveform if its an electrical failure > >> rather than a blockage; the peak current and the rise time tell you al= l > you need to know. > >> The LEM sensors that I've looked at measure AC current only, if you > >> do decide to build a setup then sensors that can measure the DC > >> component as well would give a better representation of the waveform. > >> James > >> > >> -- > >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > >> View/change your membership options at > >> http://mailman.mit.edu/mailman/listinfo/piclist > >> > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > > > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .