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| ARRAY electronic loads |
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| EEVblog:
--- Quote from: Alex on February 06, 2012, 04:03:53 pm ---Hi, I was just wondering if anyone has had any experience with the Chinese ARRAY (rebranded?) electronic loads: http://www.array.sh/yq-3700e.htm --- End quote --- I was wondering about those, they go very cheaply on ebay. Dave. |
| codeboy2k:
--- Quote from: nctnico on April 10, 2012, 11:03:08 pm ---Here is a picture of the inside of my 3710. Note that I modified the input connectors! --- End quote --- in that picture on the left hand side, note the curvy traces on the PCB. Can anyone tell me what's the design decision that went into making those traces like that. Obviously the shortest path is a straight line there, and it's clear where a straight line would go. But they didn't go straight, and I can't imagine there is anything high-speed here, so it's not a strip-line or matched impedance like that. I've also seen it done this way on the battery connections inside cell phones and home phones. In those cases, it's almost like an RF choke on the PCB, but I can't see why such an RF choke is needed here on the DC load. Anyone know why's it done that way here. |
| nctnico:
The designer probably wanted to add some extra resistance. The traces go to 2 low value wirewound resistors in series. |
| EEVblog:
--- Quote from: bsgd on April 07, 2012, 08:26:49 pm ---I have 2 BK 8500 loads and I like them a lot. --- End quote --- Looks like I might be getting a BK Precision 8500 load shortly, so stay tuned... Dave. |
| Rufus:
Beich CH8710B issue and fix. One problem I noticed with this load was significantly low voltage readings at higher currents. The photo shows the back of the input terminals and L shaped bars which are bolted on the back of them and soldered to the analog PCB. The input voltage is sensed on the PCB and I measured about 15m ohm between one terminal and the PCB and 40-50m ohm on the other. The terminals have M6 studs and the bars were fastened with a flat washer, single turn spring washer and M6 nut (which was tight). The resistance appeared to be between the terminal studs and bar so I replaced the flat and spring washers with slightly domed spring washers with a serrated surface (think they came from earthing screws supplied with a large diecast box). With that fix the resistance between terminals and PCB was about 0.5m ohm both sides. Shows bolting together two bits of metal doesn't necessarily make a good electrical connection. The washers I used were something like here http://www.bellevillesprings.com/serrated-safety-washers.html |
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