| Electronics > Projects, Designs, and Technical Stuff |
| Batteroo testing |
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| ez24:
This is the test I want to see https://www.amazon.com/Westminster-Toys-Magic-Toy-Monkey/dp/B0000V4H4O/ref=sr_1_2?ie=UTF8&qid=1481957889&sr=8-2&keywords=toy+monkey+battery And the counts of the cymbals be put in spreadsheet and a statistical analysis be done on them. |
| EEVblog:
--- Quote from: Wytnucls on December 17, 2016, 03:02:47 am ---Industry standard graphs: --- End quote --- Which chip is that from? The efficiency vs load graph will be the first thing I do. BTW I shot a video today on testing performance curves. |
| FrankBuss:
--- Quote from: jeroen79 on December 17, 2016, 01:31:57 am ---You are putting current measuring resistors in the supply and load circuits. But the power supply and the load would have their own internal shunts. Couldn't you measure the voltage across those and leave out the extra shunts? That way you wouldn't have to worry about extra voltage drops. --- End quote --- I don't have access to the internal shunts and don't want to solder anything in the power supply or the electronic load. But the voltage drop is no problem with the uCurrent, because up to an amp it is well below 0.1 V, and I can compensate this in my testing script and incrementally increase the output voltage in 10 mV steps, so that the max error will be 10 mV, e.g. for the efficiency vs. load graph which requires a fixed input voltage (unfortunately my power supply doesn't have extra sense inputs). I like the efficiency vs. load current diagrams for a given input voltage, will do this, too. And the tests Wytnucls suggested are very useful, too. Output ripple would be interesting, because one application to use a battery is for low noise things like microphone amplifiers, and they might be built in a way that they expect a very clean supply. I don't have the right equipment or knowledge to do the ESD tests, but if someone can do this, I can send the sleeves to him after my tests. |
| Wytnucls:
--- Quote from: EEVblog on December 17, 2016, 08:15:01 am --- --- Quote from: Wytnucls on December 17, 2016, 03:02:47 am ---Industry standard graphs: --- End quote --- Which chip is that from? The efficiency vs load graph will be the first thing I do. --- End quote --- Analog Devices ADP1607 http://www.analog.com/media/en/technical-documentation/data-sheets/ADP1607.pdf |
| Cerebus:
--- Quote from: IanB on December 17, 2016, 04:33:31 am ---This is puzzling. What was the actual current? --- End quote --- The simple answer: 200 uA at idle, 3-4 mA peaks while transmitting. The more rigorous answer: the Fluke 25 has a longish integration time and a slow response (2 readings per second*) so was not possible with that setup to see the shape of the current curve as the thing was starting up. I suspect there's an interaction between an inrush current, the meter's shunt resistance (500R on uA but only 5R on mA) and undervoltage lockout on the keyboard's power supply. If I can sum up the energy and find the time in all the Christmas preparations (including the requirement to get my scope, breadboard and bench power supply off the living room coffee table**) I'll try and rig up something to characterise what's going on. My curiosity is piqued too. Moreover, I'd quite like to characterise the Apple keyboard's battery gauge against actual in circuit voltages. *Checking the specs, it actually does 25 readings per second on the analogue bargraph; but I wasn't watching that, just the main display. **Add to that, it's also almost time for me to go and do the spud bashing for the Saturday evening roast (Chicken and mushroom pie, roast potatoes, roast parsnips, carrots and peas plus extra gravy, if anyone's interested). By my reckoning it'll be Tuesday before I have any time for electronics. |
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