Tektronix DPO 2024B doing weirdness

[andrew_c]

First things first... this isn't my scope. An engineer came in today to examine a product of ours and as soon as he hooked his probes up to the 12Vdc rail his scope lit up, reading some 300V in a sine.



It's certainly not a scope I'm familiar with. When I hook up my own scope everything reads perfectly fine!

I'm sure someone on here will know exactly what's up! Please tell?

[tautech]

It looks like it has the Tekprobe interface so with a plain BNC connect probe it will have defaulted to probably whatever the Ch1 attenuation was set to, this you need check. Press the Ch1 yellow menu button and check the input attenuation matches the probe.

[carl_lab]

Does the screen show the correct waveform of your 12V rail? (3/4 sine)
It doesn't look as a usual DC rail...