Electronics > Beginners

SDS1104x-e AC Coupling offset

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Steamer:
Hello,

On my just recently aquired SDS1104 I noticed something strange on channel 3 & 4 when using 1X probe and AC coupling.

Up to about a 24 volt signal the AC coupling does it job correctly, but after increasing the voltage further it gets an offset and it goes completely offscreen at about 32volt. This happens only on channel 3 & 4, I've tested channel 1 & 2 up to 36v and they work as I would have expected.

On the pictures the RMS voltage is displayed on the channel 1 measurements.

Greetings,
Emile


StillTrying:
It's possible there's negative going stuff off screen, try with the trigger point at the center of the screen and X on 2ms or 5ms/div so that there's a lot more than half a mains cycle on screen. you might also need peak-detect. and then panic. :)

tautech:
Welcome to the forum Steamer.

Please tell us the firmware version as there's been a couple of recent updates.

Also have you run the Self Cal after a good warm up period ?
This is necessary after installing FW updates to correct any possible channel offset.

Steamer:

Hello tautech,

The firmware is at version 6.1.25R2 and yes I did run several self cal routines after a good warmup.

But that didn't improve the offset.

Greetings,

Emile

tautech:
I don't quite understand the use case and why you need AC Trigger coupling and why the Trigger point is off to the left of the display.  :-//
I'm not making excuses just asking why you'd need to use a DSO in this way ?

I'll have a look at some of this behavior later today.

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