I'm using a DSO-5200A from Voltcraft and noticed the voltage measurement represented incorrectly (it is doubled).
Any ideas how to reset this?

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Channel 1 (green) measures a (noisy) 5V and has a Vmean measurement of 10V.
Channel 2 (yellow) measures the DSO's own calibration square wave. Frequency is measured correctly, but the mean value is again wrong.
The cursors correctly indicate a voltage difference of 2V.

  • \$\begingroup\$ I see you have both channels set to 10x; are you using 10x probes? Setting the scope to 10x while using 5x probes would cause this problem, but you don't see 5x probes very often. \$\endgroup\$ – Hearth Feb 11 at 14:22
  • \$\begingroup\$ Yes, I'm using 10x probes. \$\endgroup\$ – Huisman Feb 11 at 14:56
  • 1
    \$\begingroup\$ Does the CAL signal have a 50 ohm resistor inside? and expects an external 50 ohm termination resistor? \$\endgroup\$ – analogsystemsrf Feb 11 at 15:10
  • \$\begingroup\$ The DSO and probes used to give the correct measurement (for every signal, CAL included) up to 1 or 3 weeks ago. So, i think it has to be a setting somewhere in the software rather than in the hardware. But ill check your suggestion. \$\endgroup\$ – Huisman Feb 11 at 18:47
  • \$\begingroup\$ Do note the signal itself is represented correctly. Its both 2V/div. The green and yellow dots/lines are correct, the yellow signal fits within 1 div and green one in 2.5 div. The measurement however is wrong (as is the trigger level). \$\endgroup\$ – Huisman Feb 11 at 18:53

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