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| Siglent SDS804/814X HD or Rigol HDO914S for Mechatronics student |
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| Jack359:
Hello, I just wanted to update you that I found locally mildly used Rigol DHO804 for a bit more than half the price of what it would have cost me Siglent SDS804X HD, so I leaped and bought it. It has firmware 00.01.02 and from what I read perhaps is better to use it as it is and update it only if I have issues. I just noticed that in my dorm the power sockets are a bit weird (not Schuko) and if connect the scope it is not grounded. :palm: I watched the recommended here video about how not to blow up my oscilloscope In it is mentioned that not grounding the oscilloscope is actually workaround if I want to measure grounded circuits but it is not recommended. Didn't get why.. I read that DHO804 is made to run of power bank as well, so I guess it is safe to use it not grounded ? |
| Antonio90:
There might be a ground cable in the power sockets, not connected, left there by the installer. You could buy a grounded socket and get someone who knows what he's doing to install it for you. My lab's room had also non-grounded power sockets and I just swapped them all with the breaker off. Without proper grounding, the chassis, the ground in the probe compensation connector, the BNC connectors and the ground clip of your probes can become live and kill you. Some knowledgeable people float their 'scopes, but even experienced engineers have been killed by doing that. Call an electrician, run an extender cord from another room or whatever (not ideal), but ground your oscilloscope. |
| Jack359:
--- Quote from: Antonio90 on September 25, 2024, 04:38:11 pm ---There might be a ground cable in the power sockets, not connected, left there by the installer. You could buy a grounded socket and get someone who knows what he's doing to install it for you. My lab's room had also non-grounded power sockets and I just swapped them all with the breaker off. Without proper grounding, the chassis, the ground in the probe compensation connector, the BNC connectors and the ground clip of your probes can become live and kill you. Some knowledgeable people float their 'scopes, but even experienced engineers have been killed by doing that. Call an electrician, run an extender cord from another room or whatever (not ideal), but ground your oscilloscope. --- End quote --- Thanks. Some of the power sockets have ground hole and wire but they are a bit different than the plug and ground connection is not possible. I will try to find socket convertor or will just replace one of the sockets. |
| Antonio90:
--- Quote from: Jack359 on September 25, 2024, 04:51:07 pm --- --- Quote from: Antonio90 on September 25, 2024, 04:38:11 pm ---There might be a ground cable in the power sockets, not connected, left there by the installer. You could buy a grounded socket and get someone who knows what he's doing to install it for you. My lab's room had also non-grounded power sockets and I just swapped them all with the breaker off. Without proper grounding, the chassis, the ground in the probe compensation connector, the BNC connectors and the ground clip of your probes can become live and kill you. Some knowledgeable people float their 'scopes, but even experienced engineers have been killed by doing that. Call an electrician, run an extender cord from another room or whatever (not ideal), but ground your oscilloscope. --- End quote --- Thanks. Some of the power sockets have ground hole and wire but they are a bit different than the plug and ground connection is not possible. I will try to find socket convertor or will just replace one of the sockets. --- End quote --- If you can make a reliable ground connection, the DHO has a ground female plug in the back. That might get you by while you set everything up, but check the connection is solid and low impedance. |
| 2N3055:
--- Quote from: Jack359 on September 25, 2024, 04:28:11 pm ---Hello, I just wanted to update you that I found locally mildly used Rigol DHO804 for a bit more than half the price of what it would have cost me Siglent SDS804X HD, so I leaped and bought it. It has firmware 00.01.02 and from what I read perhaps is better to use it as it is and update it only if I have issues. I just noticed that in my dorm the power sockets are a bit weird (not Schuko) and if connect the scope it is not grounded. :palm: I watched the recommended here video about how not to blow up my oscilloscope In it is mentioned that not grounding the oscilloscope is actually workaround if I want to measure grounded circuits but it is not recommended. Didn't get why.. I read that DHO804 is made to run of power bank as well, so I guess it is safe to use it not grounded ? --- End quote --- Congratulations on a good money deal. Just make sure to not update to latest version of FW before Rigol publishes officially fixed one, not to brick a scope. Hope it will be OK for your use. |
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