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| Shielded cable for sensing 900V, 15 kHz PWM signal over 10 meters |
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| David Hess:
--- Quote from: matbob on February 04, 2019, 04:52:25 pm ---@jbb @David Hess: Yes, you are correct. The coax shield has to be connected to ground and also one end of the divider resistors. As you have suggested, the differential probe + coax would be the best idea. If I connect a 50 ohm coax cable to the differential probe, I will need a differential probe with 50 ohm output impedance. And at the oscilloscope end, I will have to terminate the coax with 50 ohms (if the scope does not have 50 ohm termination) for impedance matching. This will result in my output signal amplitude getting divided by 2. But that is fine. Anyone knows a differential probe which can drive the 50 ohm load? I could find only differential probes which are to be connected to 1 Meg input impedance. --- End quote --- Most or all of the probes from Pintek are specified to have a 50 ohm output if you dig into the manuals. Their manuals indicate that using a double termination decreases sensitivity by 2 as expected. Pintek seems to OEM most of the differential probes for others. |
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