Hmm. Not entirely happy with this new PSU.
Its current limited, down to about 10mA or so (difficult to adjust for small changes) and up to 5A, so thats fine. But it seems to take too long for the limiter to kick in. In the region of half or quarter of a second or so. This is much longer than I had expected.
Until I became careful about such things, I used to burn out the fuse in my DMM frequently. But have managed to avoid it for a few years now. Until today, while testing the current limiting on this PSU. It was set to 2.5v@15mA (I was experimenting with driving an LED directly). The LED glows very brightly for about half/quater second, then settles to 15mA. Replacing the LED with my DMM on 200mA range caused the fuse inside the DMM to blow.
Im not convinced this PSU will be effective at protecting my Picaxe circuits during prototyping.
Nowhere in the specs does it refer to the reaction speed of the current limiter. Have I got a duff unit, will a replacement be the same? Am I expecting too much for £60? Since its unfit for purpose, should I ask for my money back? Any modding suggestions to reduce the delay to, say, a few mS? (I was already considering voiding the warrantee to replace the pots with multi-turn types)
Its current limited, down to about 10mA or so (difficult to adjust for small changes) and up to 5A, so thats fine. But it seems to take too long for the limiter to kick in. In the region of half or quarter of a second or so. This is much longer than I had expected.
Until I became careful about such things, I used to burn out the fuse in my DMM frequently. But have managed to avoid it for a few years now. Until today, while testing the current limiting on this PSU. It was set to 2.5v@15mA (I was experimenting with driving an LED directly). The LED glows very brightly for about half/quater second, then settles to 15mA. Replacing the LED with my DMM on 200mA range caused the fuse inside the DMM to blow.
Im not convinced this PSU will be effective at protecting my Picaxe circuits during prototyping.
Nowhere in the specs does it refer to the reaction speed of the current limiter. Have I got a duff unit, will a replacement be the same? Am I expecting too much for £60? Since its unfit for purpose, should I ask for my money back? Any modding suggestions to reduce the delay to, say, a few mS? (I was already considering voiding the warrantee to replace the pots with multi-turn types)