1
\$\begingroup\$

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

enter image description here

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.

\$\endgroup\$
  • \$\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

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.