Silent SPD3303D voltage display error - Page 1
Forum section: electronics / testgear

author: daisizhou
author_rank: Super Contributor
timestamp: September 16, 2022, 05:22:19 am
content: I have used the Silent SPD3303D power supply for a long time.It is found that it is the CH1 channel, and the voltage shows an offset,CH2 channel is normal.To be precise, when the output is turned on, the CH1 channel will show a voltage offset.32v gear offset 0.03V, 24V gear offset 0.02V, 14-21V gear offset 0.01V, 0-10V gear display is accurateI don't know how to adjust it to make it look accurate.If you know how to adjust please let me know, thanks for your help

author: tautech
author_rank: Super Contributor
timestamp: September 16, 2022, 10:39:48 am
content: The readout values allow for a range of inaccuracy:From the C model Service manual:https://siglentna.com//wp-content/uploads/dlm_uploads/2019/08/SPD3303C-Service-Mannual.pdfOutput voltage setting Output/Readback voltage limitsSet Display0 mV -20 mV ~ 20 mV100 mV 79.5 mV ~ 120.5 mV1 V 0.975 V ~ 1.025 V10 V 9.93 V ~ 10.07 V25 V 24.855 V ~ 25.145 V30V 29.83 V ~ 30.17V

author: daisizhou
author_rank: Super Contributor
timestamp: September 16, 2022, 10:44:04 am
content: Thanks for your reply, do you mean normal?But my CH2 channel is very accurate.I remember that CH1 was accurate at first, and now it shifts with every use.In general, do you think this is a normal error?

author: tautech
author_rank: Super Contributor
timestamp: September 16, 2022, 11:11:49 am
content: Quote from: daisizhou on September 16, 2022, 10:44:04 amI do as it is within the limits of the C model readout error.You might consider reading the X/X-E Service manual Calibration chapter P21https://siglentna.com//wp-content/uploads/dlm_uploads/2019/08/SPD3000X-Series-Service-Manual.pdfI wouldn't recommend following the procedure until we know it can work with your D model but this late on a Friday we cannot know until Siglent return to work on Monday.Did you get a CD with the manuals with your D model ?Maybe it has the D model Service manuals.

author: daisizhou
author_rank: Super Contributor
timestamp: September 16, 2022, 12:08:45 pm
content: I did not find a specific service manual for SPD3303D,I only found service manual for SPD3303X, it may be common to 3303Dhttps://tienda.logicbus.com.mx/assets/PDF/238/SPD3000X-Series-Service-Manual.pdf

author: daisizhou
author_rank: Super Contributor
timestamp: September 16, 2022, 01:01:11 pm
content: https://youtu.be/DuT0312RQekThis is the video I took, sorry for watching too hastily, I read the 32V voltage as the 22V voltage value

author: tautech
author_rank: Super Contributor
timestamp: September 16, 2022, 08:35:07 pm
content: Quote from: daisizhou on September 16, 2022, 01:01:11 pmSome mistakes you make that maybe affecting your measurements:In Parallel mode only Ch1 output terminals are used. The red LED flashing on Ch2 is the warning to use Ch1.Examine the markings below the output terminals to understand which terminals are used in Parallel and Series modes.Also important to adjust the current (Amps) set valuenotto be 0ASet to 1A and do your measurements again.

author: daisizhou
author_rank: Super Contributor
timestamp: September 17, 2022, 12:02:59 am
content: OK.I re-tested, below is the video I took.https://youtu.be/BbYMtgIz1ZcI found that it doesn't seem to have much to do with the magnitude of the current. It seems to be related to the voltage level. I turned it down to around 20V in parallel mode and CH2 didn't flicker.At the same time, I also tested the voltage offset of CH1 channel, compared with CH2. Do you think this is normal?

author: tautech
author_rank: Super Contributor
timestamp: September 17, 2022, 12:38:15 am
content: Quote from: daisizhou on September 17, 2022, 12:02:59 amPerfectly normal.The display has 2 modes, Set mode with the channel is OFF and Output mode when the channel is ON to display the actual output load on the channel.In Parallel and Series mode Ch1 becomes the Master channel to adjust the settings but IIRC Ch2 needs be used in Series mode to reach 60V as the 2 channel voltage values are added together.The small changes in the display values remain under 40mV which meets the spec in the post I made in my first reply.If you need more accurate resolution and adjustment (1mV, 1mA) the more recent SPD3303X PSU can offer it.