I recently bought one of these I do I use this device correctly
https://www.ebay.com/itm/406019936826?var=676327747036
https://www.ebay.com/itm/406019936826?var=676327747036
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I'm trying to fix a digital multimeter. It was working until I blew the fuse (actually the "buzz" for continuity wasn't working). I've now replaced the fuse but it's acting strangely. When I turn the dial to V, nothing happens. But when I turn to anything else, it makes a continuous, very fast clicking sound - like the piezo buzzer is trying to do something. And at each position of the dial (other than V) there are brief flashes of life on the LCD. It doesn't seem to matter if the probes are connected. I wasn't sure where to start, so I've tested most of the diodes and cleaned the... -
Was testing to see if a bug zapper grid voltage (=< 2800VDC) had discharged yet. Set meter to highest range (1000 VDC) and probed across the grid. Heard an audible arc so voltage must have discharged into something in the front end of the meter. Now all functions that use the V-Ohm/Com input just reads "OL" (over range). Even the continuity test with the probes shorted reads OL with no beep. Opened it up and found input resistor R31 47 ohms, completely open. Replaced with new resistor but meter still reads "OL". The low battery icon on the display is visible even... -
Hello.
I have jut got my first analogue oscilloscope. An Isotech 620 20MHz.
I want to learn how not to damage it, and I found instructions on the internet obscure.
They talk about ground, earth, floating ground, this, that....
But they don't actually say anything anything useful so far.
I want to know:
Don't connect exactly this to exactly there or it blows up.
For example, I am tracing a signal from a function generator in an audio amp, or testing for voltages in different parts of a circuit.
I want to know what not to connect... -
I have a seemingly rare 486 motherboard which shows no signs of life.
The Motherboard is marked with the labels B887 / 8 / 9 AI, which seems to be a Mecer branded board.
With an AT power supply hooked up, the power supply turns on but the board does not post, there is no beep and there is nothing displayed on the post analyser card, whether it's plugged into a PCI slot or an ISA slot.
I found a thread on Vogons of someone else who had the same board in working condition.
What I've tried so far: (In each case, the symptoms remain unchanged as... -
I am new to electronics and I'm understanding most of what I'm reading but I have a mosfet on my board that I've identified as a P-channel Trench Mosfet. I haven't a clue how to test this and what I should expect to see with the multimeter probes. I am hoping someone with years more experience than myself can help me understand how to use a multimeter to read this. Please look at the drawing I have attached to this and can you try to explain to me what I should be doing with my multimeter in diode mode and what results I should expect from a good mosfet?...
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