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| ARRAY electronic loads |
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| T4P:
I'm still thinking whether the battery test function is worth the extra dollars ... --- Quote from: nctnico on September 23, 2012, 07:05:04 pm ---Instead of one 3711A I bought two 3710A devices. They can be parallelled to handle more load or put in series for a higher voltage or used for two different projects at the same time. --- End quote --- Sure but they aren't exactly light or half the price in any way so i'd get a single 300W unit plus shipping's not free. so yeah (40-50bucks for 4.5kg) |
| LaurenceW:
T4P, i should declare "an interest" first - I've just bought a Maynuo M9712B! (300W, 500V 15A) In looking at the Array equivalent, a few points. The Maynuo specs quote almost an order of magnitude better basic accuracy (Maynuo 0.03%+0.05%FS Vs Array 4.00~35.99V?0.2%+30mV ) The Array generally resolves to three decimal places (1ma, 1mV) while the Maynuo stretches to four for voltage (0.1mV) and five for current (10uA!!), BUT that last current place is most iffy - call it four decimal places (100uA) The array does boast a lower minimum or short circuit resistance; this is a function on the lower voltage mosfets. (The 500V Maynuo can "only" go down to about 0.25 Ohm) The 500V Maynuo can only handle 15A, Vs the 360V Array's 30A. What do you really need? The Maynuo battery test function is an eye-opener; especially if you use a lot of rechargeable cells, and they don't seem quite as efficacious as they once were. The battery test function quickly weeds out dieing cells, with poor mAhr figures The Array comes with wings ;D Why, I wonder? The Maynuo sports a front rubber bumper. The Maynuo number pad is upside down (GRRR), but the Array number pad is even WORSE! Does this matter? Well, I find it slows down your direct input typing speed a lot, yes. To see how number pads SHOULD be laid out, look at an Array 3720 series (but don't look a the price - ouch) The Maynuo sticks out about 120mm further (deeper) than the Array. How deep is your test bench? The Array boasts FOUR fans to Maynuo's two. I suppose it depends on how big a fan fan you are. (Maynuo seems to manage fine with its internal pair) The Maynuo includes a V-set function (Think: 300W Zener Diode!) while the Array appears not to offer this. The Maynuo allows you to set a number of set points (i.e currents) and then switch or slew between them, so that you can observe how your power supply performs under transient load situations. I cannot see that the Array offers this. I am interested in transient performance, but your applications may not need this. The Maynuo is about 50% more expensive than the Array So I think that the Maynuo is " mostly winning" here, but it depends on your budget and whether you feel you actually need these extra features. |
| T4P:
--- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Maynuo specs quote almost an order of magnitude better basic accuracy (Maynuo 0.03%+0.05%FS Vs Array 4.00~35.99V?0.2%+30mV ) --- End quote --- Great! Didn't notice that. --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Array generally resolves to three decimal places (1ma, 1mV) while the Maynuo stretches to four for voltage (0.1mV) and five for current (10uA!!), BUT that last current place is most iffy - call it four decimal places (100uA) The array does boast a lower minimum or short circuit resistance; this is a function on the lower voltage mosfets. (The 500V Maynuo can "only" go down to about 0.25 Ohm) --- End quote --- Hmm ... Do i need more than 1mA reso? nope. lol :P but i definitely need more than 0.25Ohms so that rules the M9712B out --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The 500V Maynuo can only handle 15A, Vs the 360V Array's 30A. What do you really need? --- End quote --- Ah ... i feel the need for 30Amps ... --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Maynuo battery test function is an eye-opener; especially if you use a lot of rechargeable cells, and they don't seem quite as efficacious as they once were. The battery test function quickly weeds out dieing cells, with poor mAhr figures --- End quote --- i was going to buy a http://dx.com/p/imax-b6-2-5-lcd-rc-lipo-battery-balance-charger-100-240v-us-plug-35190?item=2 balance charger for it's main purpose but it's also good for testing it seems http://dx.com/p/imax-b6-2-5-lcd-rc-lipo-battery-balance-charger-100-240v-us-plug-35190?item=2 --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Array comes with wings ;D Why, I wonder? The Maynuo sports a front rubber bumper. --- End quote --- Think Cessna-182 vs Bugatti Veyron --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Maynuo number pad is upside down (GRRR), but the Array number pad is even WORSE! Does this matter? Well, I find it slows down your direct input typing speed a lot, yes. To see how number pads SHOULD be laid out, look at an Array 3720 series (but don't look a the price - ouch) --- End quote --- Yarr matey, the 3721A costs 100$ more than the M9712B --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Maynuo sticks out about 120mm further (deeper) than the Array. How deep is your test bench? --- End quote --- 600mm but i like 300mm for my actual space but i can let it sit on the edge, well then i'll take the maynuo --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Array boasts FOUR fans to Maynuo's two. I suppose it depends on how big a fan fan you are. (Maynuo seems to manage fine with its internal pair) --- End quote --- I like fans. The more the better, but ah well --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---The Maynuo includes a V-set function (Think: 300W Zener Diode!) while the Array appears not to offer this. The Maynuo allows you to set a number of set points (i.e currents) and then switch or slew between them, so that you can observe how your power supply performs under transient load situations. I cannot see that the Array offers this. I am interested in transient performance, but your applications may not need this. --- Quote ---Lack of V-set? That's sad. Oh well. --- Quote from: LaurenceW on September 23, 2012, 10:12:19 pm ---So I think that the Maynuo is " mostly winning" here, but it depends on your budget and whether you feel you actually need these extra features. --- End quote --- The maynuo M9712 is only 60$ more but the M9712B is twice the price of the 3711 :o --- End quote --- --- End quote --- |
| saturation:
Just checking tabao its amazing they are near the same price. If what you need works within the limitations LaurenceW very well summarized for Maynuo, you get more for your money. What is cut to reduce costs? We know it works well now, but will it affect the Maynuo durability over time? I am impressed they are moving fast, my speculation would be they wouldn't risk a bad reputation on a fragile product since many of its product are variations on a common theme, its eloads, and if one performed badly, it reflect on all of the others as well. OTAH, Array is less speculation on durability . The only reason to get an Array is the few areas it excels are areas you require. Gossen-Metrawatt thinks its built well enough to put their name on it, crmaris from tekpowerup.com uses 7 units for his many PSU reviews spanning > 1 year, and its been in production for ~ 10 years. Although a push button AH test is convenient, you are better testing AH with a discharge curve, as the curve's shape also gives you a more complete health check of the battery. The Array can do it with external software compared to the push button of the Maynuo, but you still need to connect either to a PC to collect the data to generate the curve, so include the interface adapter too in your cost [ in the Tekpower I bought, all the accessories were included in the price.] --- Quote from: T4P on September 23, 2012, 06:30:41 pm ---Good info thanks saturation, so the question still begs ... Maynuo M9712 OR Array 3711A Both are around the same prices with the Maynuo being newer but the maynuo is only 150V and has battery test feature (Of course my prices are quoted from china directly) Forget about the CA5030 from precisegauge, i can get a 3711A cheaper than the CA5030 --- End quote --- |
| T4P:
Well the RS232 interface cable is quite literally cheap, compared to the prices fluke charges for a rs232 interface cable :P But yeah, one area it seriously lacks is V-set. |
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