DTB pocket-size digital multimeter – technical specifications, operating instructions and schematic diagram. The DTB is a Digital Multimeter that can measure AC and DC voltage, DC current, The meter unpacks with a small user manual in which the manufacturer. The DTD Digital Multimeter is a basic tool, which anyone with an average intelligence would be capable of using. This is not an auto-ranging meter, and you.
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DTB multimeter not working – Electrical Engineering Stack Exchange
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repairing the DT830B digital multimeter
However, when I powered it up using a newly bought 9V battery, it doesn’t seem to work.
Switching the dial will only move the decimal point on the LCD, and display the “HV” warning if the dial is in high voltage range. Nothing else seems to work, I can’t measure voltage or resistance, nothing else is shown on the display.
Even worse, the LCD will fade away and become blank after 5 seconds if the dial is not moved. At first I suspected the manuwl, but replacing the battery does not help.
I use my analog multimeter to check the fuse onboard and it seems OK. Anything else I could do to fix the multimeter? Looking forward to any advice. That is why you never buy stuff from ebay! Gas cost might ddt830b half the cost of the meter. You can get a backlit version for 4.
I got mine free from a power supply manufacturer. I guess luck was not on my side. I will contact the seller to see if he’s nice enough to refund me, or re-send me another unit. I don’t believe that the seller deliberately sells faulty unit, my multimeter might have been damaged during shipping. Is it really that easy to damage a multimeter the packaging was adequate and intact when I received it? It’s very difficult to damage a multimeter. There is a fuse, but usually it’s for current only.
All I would do is to check for loose parts, but I’ll bet you did that already.
Buy Products Online from China Wholesalers at
Postage shipping it back may kill you. It’s worth a shot to ask. Electronics suppliers will tell me to keep the parts dt803b I got the wrong ones. Sometimes I’ve had to mail them a pic. I have one such sample that burnt off in moments after purchase. If there is no taker, the manufacturer wont dare to make things.
Chinese stuff breaks all the time. Sometimes it beeps, sometimes it doesn’t for a day or two; but ironicly it still works! I manuao Panasonic stuff was good quality! That’s a trimmer pot red area.
Probably for calibrating the meter. ModemHead Member Nov 20, A lot of inexpensive DMMs, panel meters, etc. It is a “chip-on-board”, meaning the silicon die is glued directly to the PCB and covered with a blob of epoxy. Cheaper to manufacture this way. Also, the flexible connector between the PCB and LCD requires compression for good contact, so pressing on parts can cause also random display patterns.
And yes the trimmer is for calibration. So if you got lucky and and the meter started working, it would be un-calibrated now. The blob has the proper name of “IC die”. I used to use an ultrasonic bonder. Your loose dt30b, could very well be under the black blob. Note that it has a regular IC pad around it, so resumeably an IC of the right package could be soldered there.
Got all the parts right. Thanks all for the info. I learned something new, even if the multimeter can’t be used I contacted the seller a guy from China and got a full refund.