Products > Test Equipment

Siglent SDS1104X-E DC offset thermal drift

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nixz:

--- Quote from: bdunham7 on December 15, 2022, 07:32:38 pm ---That seems excessive.  Check to make sure that 'Quick CAL' is turned on in the Utility menu.  If it is and this behavior persists, you likely need to exchange it.

--- End quote ---
I've checked 'quick cal' also without luck. I'm afraid you are right - RMA will be next step...

bdunham7:

--- Quote from: nixz on December 15, 2022, 10:43:53 pm ---I've checked 'quick cal' also without luck. I'm afraid you are right - RMA will be next step...

--- End quote ---

The fact that shorting the inputs makes a significant difference is a bad sign.  I'm not at all sure why you would see that on multiple channels, but something is wrong.  Better luck next time!

nixz:

--- Quote from: 807 on December 15, 2022, 08:32:05 pm ---These are the traces of my brand new scope. Taken after being on for nearly an hour. One of them is DC & other is AC coupled. Mean values shown under trace.

I watched it from switch-on & the traces hardly moved.

nixz...did it stay at those values, or did it move any more at all?

sw ver 6.1.37R8

--- End quote ---

My FW is V6.1.37R9, after warmup only ch 4 is "in range" in AC coupling mode, 1, 2 and 3 are out. In DC coupling they are fair. After cold power on traces in AC are close to "fair" and quickly go out of the screen (hard to catch).

See attached screens for exact values:

tautech:

--- Quote from: nixz on December 15, 2022, 10:41:54 pm ---Here is my current setup:

--- End quote ---
OS version should be 8.3. There are several additions to the feature set that require this new OS to be installed.

It is one of the easiest upgrades as you just place the new OS files is the root of a USB stick then boot the DSO.
Just remember to delete them afterwards otherwise they will run each time the DSO boots if left plugged into the USB port.

BillyO:

--- Quote from: bdunham7 on December 15, 2022, 07:32:38 pm ---Check to make sure that 'Quick CAL' is turned on in the Utility menu.

--- End quote ---
This did not help in my case.


--- Quote from: bdunham7 ---The fact that shorting the inputs makes a significant difference is a bad sign.
--- End quote ---
Hmm.  For me the problem was only serious in AC coupling and it did not make any difference if the leads were shorted or not.  In DC coupling the offset was at least an order of magnitude less and in Gnd coupling there was no offset at all.  But shorting the leads in AC coupling did nothing but increase the noise slightly.

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