| Products > Test Equipment |
| Scope Current Probe Deskew Fixture PCB Project |
| << < (4/9) > >> |
| 2N3055:
--- Quote from: Jay_Diddy_B on August 21, 2020, 01:15:15 pm ---Hi, I have looked carefully at the high resolution picture that was posted by forum member Martin72. This is what I see from the photo: ----------------------------------------------------------------------------------- I have not drawn the cmos 555 circuits. I have indicated the power dissipations in the resistors. I have shown correctly the relationship between the coil, the resistors and the voltage test points. By connecting the voltage test point to the bottom resistor, this guarantees that the voltage and current are in phase. Regards, Jay_Diddy_B --- End quote --- Jay, those are very much correct. Pulse generating circuit is not important. It can even be driven with pulse generator.. Regards, Sinisa |
| Martin72:
--- Quote from: tautech on August 21, 2020, 07:47:59 am ---This is the unit in this pic however as it's nearly 5MB ::) --- End quote --- Remember, I´ve promised 2N3055 a hires pic.. ;) |
| 2N3055:
--- Quote from: Martin72 on August 21, 2020, 08:04:44 pm --- --- Quote from: tautech on August 21, 2020, 07:47:59 am ---This is the unit in this pic however as it's nearly 5MB ::) --- End quote --- Remember, I´ve promised 2N3055 a hires pic.. ;) --- End quote --- And as a man of honour, you kept it!! ^-^ |
| _Wim_:
--- Quote from: steve1515 on August 20, 2020, 02:12:10 am ---I've updated my schematic to simplify it a little bit and also have a 3D render of my board. What do you guys think? --- End quote --- I would connect your voltage header just above R4, as this is more representative for the current actually going through the coil during the turn-on and turn-off of the FET. |
| _Wim_:
Green trace: deskew voltage out (short coax) Blue trace: deskew voltage out (scope probe 10x) => 8ns slower! Red trace: Pearson 411 passive current probe (same short coax length as green trace) => no measurable delay Yellow trace: Fluke I50A current probe => 17ns slower Test Fixture: 12ns rise time, 18ns fall time Remark: Pearson has slower rise time as bandwidth is only 20Mhz vs 50Mhz for the fluke probe. |
| Navigation |
| Message Index |
| Next page |
| Previous page |