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| Test Equipment Anonymous (TEA) group therapy thread |
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| Zoli:
--- Quote from: AVGresponding on July 07, 2022, 06:48:23 pm --- --- Quote from: Zoli on July 07, 2022, 06:14:22 pm --- --- Quote from: AVGresponding on July 07, 2022, 05:51:48 pm --- --- Quote from: Zoli on July 07, 2022, 05:39:33 pm ---Your case is simple: everything above 3.000V is out of spec, and should be discarded. If you think that the manual is wrong, you can always ask the manufacturer. --- End quote --- I don't think so; the manual describes 3.000V as "full scale". ... --- End quote --- Please explain in details, why over-range data should be considered valid; thanks in advance. --- End quote --- It's not over-range. 3.1V is over-range. The manual mentions the frequency measurements over 200kHz have unspecified accuracy. Why not just make them over-range? Why not make 3.001V on diode test over-range? Why not mention that 3.001V to 3.099V are unspecified accuracy? I think 3.1V is full scale, and the manual is just wrong. I shall measure the VF of a string of diodes that reads between 3.001 and 3.099 on the F87 and see what a 6.5 digit meter says with a 0.6mA compliance current (the typical value for the F87 as per the manual). I'm betting it's within the accuracy specs for the 3.000V mentioned in the manual. --- End quote --- What you think and what the manufacturer specifies are two different things; the manufacturer spec is true for all the specified operating conditions(relative humidity, temperature, pressure). To give you a more understandable example: 3.001V place you in Old Trafford, 3.000V place you on the playing field. :-DD :-DD :-DD But, as usual, you can ask the manufacturer, and/or submit correction request. ;) |
| xrunner:
--- Quote from: bd139 on July 07, 2022, 06:53:52 pm ---More cleaning … haven’t had a 465B this good yet. Hope the IC works :-DD --- End quote --- Good job. I'm thinking about those knobs on the AC/DC/GND selector. I wish I had some to play with because I want to try a reconditioning idea with some modelling paints (not colored paint mind you ...). Might or might not work. Hmmm oh well if I ever got some I might do it. |
| AVGresponding:
--- Quote from: Zoli on July 07, 2022, 07:13:28 pm --- --- Quote from: AVGresponding on July 07, 2022, 06:48:23 pm --- --- Quote from: Zoli on July 07, 2022, 06:14:22 pm --- --- Quote from: AVGresponding on July 07, 2022, 05:51:48 pm --- --- Quote from: Zoli on July 07, 2022, 05:39:33 pm ---Your case is simple: everything above 3.000V is out of spec, and should be discarded. If you think that the manual is wrong, you can always ask the manufacturer. --- End quote --- I don't think so; the manual describes 3.000V as "full scale". ... --- End quote --- Please explain in details, why over-range data should be considered valid; thanks in advance. --- End quote --- It's not over-range. 3.1V is over-range. The manual mentions the frequency measurements over 200kHz have unspecified accuracy. Why not just make them over-range? Why not make 3.001V on diode test over-range? Why not mention that 3.001V to 3.099V are unspecified accuracy? I think 3.1V is full scale, and the manual is just wrong. I shall measure the VF of a string of diodes that reads between 3.001 and 3.099 on the F87 and see what a 6.5 digit meter says with a 0.6mA compliance current (the typical value for the F87 as per the manual). I'm betting it's within the accuracy specs for the 3.000V mentioned in the manual. --- End quote --- What you think and what the manufacturer specifies are two different things; the manufacturer spec is true for all the specified operating conditions(relative humidity, temperature, pressure). To give you a more understandable example: 3.001V place you in Old Trafford, 3.000V place you on the playing field. :-DD :-DD :-DD But, as usual, you can ask the manufacturer, and/or submit correction request. ;) --- End quote --- You seem to think manufacturers never make mistakes. FYI I just measured a collection of random diodes I manged to arrange to get a reading of 3.053V on the F87. I measured that voltage drop in parallel (quicker than making a whole new setup) with a Keithley 2015. It said 3.05242V. I don't even need to bother doing the maths, that's clearly well within the 2%+1 LSD spec, and well within the combined uncertainty of the meters. I put it to you that the 3.000 figure in the manual is a typo, and should read 3.099V. Or perhaps they just felt 3.000V looked neater than 3.099V, such things have been known. If they haven't bothered to correct the Hi Res firmware issue (afaik), why would they bother with a trivial typo? EDIT: Incidentally, while the manual gives a figure of 0.6mA (typ) for diode test current, I measured mine as 0.78mA and change. That's 30% away from "typical". Make of that what you will. |
| mnementh:
--- Quote from: Robert763 on July 07, 2022, 03:34:20 pm --- --- Quote from: m k on July 07, 2022, 03:00:32 pm ---What was the beginning? I've not followed it. I've wondered many times why people are so keen to selling their excess. How many life times it'll take to pay that hardware back. Here I'd probably have to pay more /kWh if my usage goes under some electric heating level but that is probably all. Then I read how somebody is selling watt hours. I don't get it. Though I do know that unauthorized panels are or used to be a big no-no in Spain. My understanding is also that it includes all types of uses and that the reason is overall used grid power. --- End quote --- Well in some countries you were / are paid MORE for the power fed into the grid than you pay for power taken out of it. Sometimes a lot more. This is of course paid for by a "green" tax on all the other consumers. I've often wondered if anyone out there was charging batteries during the night and feeding the grid in the day to make money.... --- End quote --- Oh, I've no doubt that would last a hot minute before they instituted some averaging plan to curb such creative entrepreneurial spirit... :-DD mnem But hey... you can still electrocute yourself for free! |
| mnementh:
eBay Return Update: Something new in the resolution process: Once you initiate the dispute resolution, you no longer have means to communicate from within the dispute, only via external PM with the seller. In this case, since eBay started the process, I never got the chance to enter the reasons for the dispute, or describe the condition it was received in. Why the fuck would you EVER take communication out of the dispute resolution process? What fucking moron thought that was a good idea? mnem Tell me again why we ever buy anything from that shithole...? |
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