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I want to measure the voltage across a resistor in my circuit. The circuit is battery powered. I don't want to use the two probe method and calculate A-B to get the results. Can I use one probe to measure the differential voltage as shown in the figure below? No other point in the circuit is connected to the oscilloscope GND except one of the test points.

enter image description here

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    \$\begingroup\$ youtube search for "how not to blow up your oscilloscope". While one could easily answer this as yes or no, you should really inform yourself to answer it yourself, so that you can do it in the future \$\endgroup\$ – PlasmaHH May 23 '18 at 21:01
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    \$\begingroup\$ No USB, no audio connection, no debugger connected, nothing? No other path from anywhere on the DUT to earth ground through another cable or piece of hardware? \$\endgroup\$ – mkeith May 23 '18 at 21:10
  • \$\begingroup\$ There is no other connection to earth ground, no USB, no audio, no debugger connected, no connection to PC/laptop \$\endgroup\$ – akki_rulz May 23 '18 at 21:16
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    \$\begingroup\$ Of course you can. Floating also means that you don't have any capacitive current leaks. \$\endgroup\$ – Dorian May 23 '18 at 22:16
  • \$\begingroup\$ Thank you Dorian. Is there any measurement error if I use this technique instead of two probe method? \$\endgroup\$ – akki_rulz May 24 '18 at 19:07
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Looks like you are trying to measure current. A single ended probe would work only work if the resistor was also connected to ground.

Info on low side power measurements: http://www.electronicdesign.com/power/what-s-difference-between-high-side-and-low-side-current-sensing

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