Siglent 1052dl+ Waveforms look good but peak to peak voltages low.... why - Page 1
Forum section: electronics / beginners

author: deezdrama
author_rank: Contributor
timestamp: December 18, 2022, 09:36:19 am
content: This is probably a stupid question but just got this Siglent 1052dl+ about a week ago.Built a cheap signal generator and played with it a bit then moved on to probing a problem crt monitor ive been working on with sync issues.I tested various pins on the sync seperator IC chip to compare with the waveform examples in the service manual of this sony pvm20m2u monitor.All the waveforms looked ok to my untrained noobie eyes but noticed all the peak to peak voltage readings were many factors lower than what the service manual notes.Is this simply a product of using the probe in 10x?The service manual also calls out the pin voltages for testing with a dmm and they were all good so why does the scope read out the voltages so low besides the fact I dont know what im doing lol.

author: pcprogrammer
author_rank: Super Contributor
timestamp: December 18, 2022, 09:41:11 am
content: I can't see the scope settings on the picture you show. But if the readings are a factor 10 of then you should indeed check the probe and the settings on the scope to see if they match.

author: rstofer
author_rank: Super Contributor
timestamp: December 18, 2022, 09:46:18 am
content: Most scopes have a setting for the probe multiplier.You probably should leave the probe at 10x so that you don't load the circuits and also attenuate any high voltages you might stumble in to.

author: deezdrama
author_rank: Contributor
timestamp: December 18, 2022, 09:52:10 am
content: Quote from: rstofer on December 18, 2022, 09:46:18 amYeah, ive left it on 10x since ive read its wise to for beginners. Also i set 10x on the scope unless it reverts back when you press the defaults button which I did between readings.Im still a defaults and auto button using noob lol

author: pcprogrammer
author_rank: Super Contributor
timestamp: December 18, 2022, 10:07:48 am
content: It would help if you give us the brand and model number of your scope.

author: deezdrama
author_rank: Contributor
timestamp: December 18, 2022, 10:43:42 am
content: Quote from: pcprogrammer on December 18, 2022, 10:07:48 amOops.... Siglent 1052dl+

author: pcprogrammer
author_rank: Super Contributor
timestamp: December 18, 2022, 10:55:46 am
content: Ah tautech territoryHe would advice to read this thread.https://www.eevblog.com/forum/beginners/what-an-oscilloscope-recommended-for-a-woman-passionate-about-electronics/msg3104228/#msg3104228It is a different model, but will help in understanding your scope.You could edit the title of your thread to include this information to get more knowledgeable answers.

author: deezdrama
author_rank: Contributor
timestamp: December 18, 2022, 07:32:19 pm
content: Quote from: pcprogrammer on December 18, 2022, 10:55:46 amI read in the linked thread that the siglent default button will default to 1x probe setting so that was my problem.Ill have to set a user default with 10x set. Thanks

author: tautech
author_rank: Super Contributor
timestamp: December 19, 2022, 06:39:37 am
content: Quote from: deezdrama on December 18, 2022, 07:32:19 pmUnfortunately the DL+ doesn't have the User Default feature using a single button press however there is something similar within the Save/Recall menu.You'll need to do a factory Default just like before setting a User Default but instead save a Setup to be recalled with your preferred default settings.Read:2.12 Storage System P72https://int.siglent.com/u_file/document/SDS1000CML+_DL+_UserManual_UM0101A-E01B.pdfAnd if I may offer a simple sanity check I learnt decades ago by just placing the probe tip on the probe compensation output should for a Siglent display ~3V p-p which instantly indicates if you have probeandinput attenuation set correctly.