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| Use of Oscilloscope Probe x100 Vs x1000 |
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| bdunham7:
The BK/Cal Test probes are made in Taiwan, the Testec say they're made in Germany and I haven't heard anything bad about either. Others have recommended the Testec TT-HV 250 but I haven't tried it. At 50kHz and 1000VRMS, you'll have an input impedance that is dominated by the capacitor at about 636k and a resulting current of about 1.5mA (90 degrees leading). Note that this does not mean the probe is dissipating 1.5 watts! This may have some effect on the circuit but it isn't too bad and it may not mind at all since it gets most of the energy back--the 1.5mA is mostly recirculating. Circuit loading can make it very difficult to accurately scope HF/HV signals! |
| KungFuJosh:
I have the BK probe, and it's good, but I've never gone over ~500V with it. |
| 2X:
--- Quote from: bdunham7 on April 05, 2024, 11:05:58 pm ---The BK/Cal Test probes are made in Taiwan, the Testec say they're made in Germany and I haven't heard anything bad about either. Others have recommended the Testec TT-HV 250 but I haven't tried it. At 50kHz and 1000VRMS, you'll have an input impedance that is dominated by the capacitor at about 636k and a resulting current of about 1.5mA (90 degrees leading). Note that this does not mean the probe is dissipating 1.5 watts! This may have some effect on the circuit but it isn't too bad and it may not mind at all since it gets most of the energy back--the 1.5mA is mostly recirculating. Circuit loading can make it very difficult to accurately scope HF/HV signals! --- End quote --- Thanks for the reply. One thing I didn't catch... Why the probe will not dissipating 1.5 watts ... it gets most of the energy back--the 1.5mA is mostly recirculating? |
| 2X:
Testec TT-HVP-40 https://www.batronix.com/shop/measurement/probes/Testec-TT-HVP-40.html Testec TT-HVP-2739 https://www.batronix.com/shop/measurement/probes/Testec-TT-HVP-2739.html |
| bdunham7:
--- Quote from: 2X on April 05, 2024, 11:20:39 pm --- Testec TT-HVP-40 https://www.batronix.com/shop/measurement/probes/Testec-TT-HVP-40.html Testec TT-HVP-2739 https://www.batronix.com/shop/measurement/probes/Testec-TT-HVP-2739.html --- End quote --- The first is useless for you (it is only a low BW tool) and the second is massive (literally) overkill. I would use my Tek P6015s for this, but I happen to have them--I wouldn't buy them for this occasion. As far as recirculating or reactive currents, that's just basic AC circuit theory that you should get acquainted with. When you put a capacitor across a sinusoid AC source, there is in fact a current and it is also a sinusoid, but it is out of phase by 90 degrees (leading the voltage) and therefore half of the time energy is being transferred to the capacitor and half them time it is being transferred from the capacitor, less any losses of course. If losses are low, there is very little energy actually lost in the process. If your signal is not sinusoidal, things get more complicated but the same basic principles apply. |
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