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| Clarification about floating measurement with an insulated oscilloscope |
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| lor3n7o:
--- Quote from: David Hess on April 01, 2021, 01:46:26 am --- --- Quote from: lor3n7o on March 31, 2021, 07:09:37 am --- --- Quote from: David Hess on March 27, 2021, 02:28:09 am ---The probe is simpler than that and does not have a balanced input. Ground goes through without any series resistance. The P6055 is an example of a x10 probe with 1 megohm input resistance with the same configuration. The P6009 is an example of a x100 probe with 10 megohm input resistance with the same configuration. --- End quote --- the p5102 is 10x and 5Mohm. So do you think it would have 9Mohm series resistor to make the 10x partition and in addition an additional 10Mohm resistor at the input to lower the total input resistance to 5Mohm ?? --- End quote --- No, like the examples I give, it has a much lower series resistor of about 4.5 megohms. --- End quote --- According to your idea, your configuration would be like this ? |
| David Hess:
--- Quote from: lor3n7o on April 01, 2021, 06:59:22 am ---According to your idea, your configuration would be like this ? --- End quote --- That is about right. I am not sure about the exact values and am too lazy to calculate them at the moment. |
| le_yum:
--- Quote from: lor3n7o on April 01, 2021, 06:59:22 am --- --- Quote from: David Hess on April 01, 2021, 01:46:26 am --- --- Quote from: lor3n7o on March 31, 2021, 07:09:37 am --- --- Quote from: David Hess on March 27, 2021, 02:28:09 am ---The probe is simpler than that and does not have a balanced input. Ground goes through without any series resistance. The P6055 is an example of a x10 probe with 1 megohm input resistance with the same configuration. The P6009 is an example of a x100 probe with 10 megohm input resistance with the same configuration. --- End quote --- the p5102 is 10x and 5Mohm. So do you think it would have 9Mohm series resistor to make the 10x partition and in addition an additional 10Mohm resistor at the input to lower the total input resistance to 5Mohm ?? --- End quote --- No, like the examples I give, it has a much lower series resistor of about 4.5 megohms. --- End quote --- According to your idea, your configuration would be like this ? --- End quote --- from the p5102 datasheet: "The P5102 is a high-voltage passive probe designed for use with TekScope THS700 series instruments. The probe features a floating common and is ideal for measuring and troubleshooting power supplies and high-voltage devices." floating common lead, so the correct wiring is probably your first suggestion |
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