| Products > Test Equipment |
| HANMATEK-DOS1104 not ground referenced |
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| VSV_electron:
Hello! I should've probably posted this question in the 'Beginners' section of the forum but since this is a question about a specific device I place it here. There is a budget 4-channel DSO oscilloscope branded as HANMATEK (with a funny mirrored 'N') with the brand being closely related to the OWON line of the scopes. The model is 'HANMATEK-DOS1104'. Here it is: https://www.banggood.com/HANMATEK-DOS1104-Digital-Oscilloscope-with-4-Channels-and-Screen-7-inch-or-18-cm-TFT-LCD-Display-Portable-Professional-Oscilloscope-Kit-with-1GS-or-s-Sampling-Rate-p-2000243.html Normally all similarly constructed bench top DSOs are ground referenced but this one has a wall power adapter with no ground reference on the oscilloscope itself. I know that the ground reference in the scopes is for a reason (and there are quite a few reasons including the operator safety). I'm planning to use this device as a "better" (hopefully so!) alternative to the logical analizer for digital circuits such as 8-bit vintage stuff and MCU devboards. For the named applications what should be my main concern when working with such a 'ground unreferenced' scope on the mentioned board types? I certainly understand that I can fry digital boards by simultaneously connecting the multichannel scope's common ground clips to the "improper" circuit points but other than that what should be my "foolproof set of rules" when using HANMATEK-DOS1104 in its 'NOT ground referenced' configuration with the digital circuits? In other words what are the most obvious scenarious in which I could go wrong and be otherwise safe with the ground referenced scope again in the same application area? |
| modoran:
Just don't use the scope in the primary side of power supplies or anything tied directly to mains and there will be no problems. |
| VSV_electron:
--- Quote from: modoran on March 07, 2024, 08:59:07 am ---Just don't use the scope in the primary side of power supplies or anything tied directly to mains and there will be no problems. --- End quote --- At first I didn't give enough though to your advice and probably replied incorrectly. I rewrote it. I understand the meaning of your warning is NOT to connect some channel of the scope to the hot side of the SMPS and at the same time probing low voltage/signal parts of the DUT with other channels so not to accidentally transfer the high potential to the low voltage side of the circuit. |
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