Siglent SPD3303X(-E) calibration FW1.01.01.02.07R2 - best practice

[jgartrel]

Some side notes:
- You cannot use EasyPower to send the SCPI commands. It seems to (intentionally?) botch the calibration commands. The best way is to use a telnet client (like https://putty.org/) to establish a telnet connection to port 5025. Or you can use NI VISA MAX instead. If you do, you must use "Write" in the NI VISAVisa Test Panel, not "Query".

With firmware version 1.01.01.02.07R2, I too had issues on MacOS using 'telnet' to connect to the device. Commands such as '*CALCLS 0' and '*IDN?' would work, but 'CALibration:VOLTage ch1,1,0.8613' would fail with a beep.

The calibration command would be accepted in firmware version 1.01.01.02.05, but the command '*CALST' (to store the new values) would fail.

I did have success using a Windows box with NI-MAX v5.4.1, but I was hoping for something that could be run without needing NI-MAX.

What eventually worked for me was to use 'netcat' instead of 'telnet' on MacOS. Following BreakingOhmsLaw recipe above, using the following sequence of commands from the Terminal in MacOS, I was able to successfully calibrate the device:

Code: [Select]

$ printf 'CALibration:VOLTage ch1,1,0.8613\n' | nc -w 5 192.168.X.X 5025
$ printf 'CALibration:VOLTage ch1,2,25.740\n' | nc -w 5 192.168.X.X 5025
$ printf '*CALST\n' | nc -w 5 192.168.X.X 5025
$ printf '*IDN?\n' | nc -w 5 192.168.X.X 5025
Siglent Technologies,SPD3303X,XXXXXXXXXXX,1.01.01.02.07R2,V3.0

When looking at what 'telnet' believes it is sending vs what 'netcat' believes it is sending, they look identical with 0x0a line terminations.  However, there must be more that I am missing here.

UPDATE: After a packet capture, it is apparent that 'telnet' is actually replacing the newline with CRLF behind the scenes. Toggling CRLF on/off in 'telnet' has no effect (CRLF is still sent). However, after configuring 'telnet' to 'set outbinary' via an escape command, the proper 0x0a line termination is sent and 'telnet' is usable.  This may also be a source of many other terminal programs also failing to send a properly formatted calibration command that the SPD3303X(-E) does not reject.

Thank you to BreakingOhmsLaw for all the hard work on putting this post together! I hope this additional info helps others on their journey.

[rolfdegen]

Houston, we have a problem!

Problem with new Firmware SPD3303X_V1.01.01.02.07R2.ADS 
After a while (> 1 hour) the power supply switches off the active channel 

My firmware vesion: SPD3303X_V1.01.01.02.07R2.ADS

[BreakingOhmsLaw]

Houston, we have a problem!

Problem with new Firmware SPD3303X_V1.01.01.02.07R2.ADS 
After a while (> 1 hour) the power supply switches off the active channel 

My firmware vesion: SPD3303X_V1.01.01.02.07R2.ADS

How old is your unit? The early version had a problem with a bridge rectifier overheating that was the cause for it switching off after some time.

[rolfdegen]

This is my Power Supply SPD3303X-E with hack for higher resulution. With the old firmware I had no problems with switching off 

[BreakingOhmsLaw]

Hardware version 3.0 has that rectifier bug.
If it's still under warranty, revert to old FW and have it repaired.

[orzel]

Hardware version 3.0 has that rectifier bug.
If it's still under warranty, revert to old FW and have it repaired.

Mine is version 3.0 as well, but i never had any problem.

Do you happen to know where we can have more information about this 'rectifier bug' ? Is that something easy to fix by ourselves ?

[rolfdegen]

The bug does not occur in the old firmware 1.01.01.02.05. The voltage and current are very stable. Fan speed is normal.

Video Siglent SPD3303X, hot bridge, hot regulators, modification for long life time

https://youtu.be/nvGxl44cNno

Hardware hotspot: https://youtu.be/mdOauVzY9OU?t=1651

I think the best way is a small fan for chip cooling 

[tautech]

Hardware version 3.0 has that rectifier bug.
If it's still under warranty, revert to old FW and have it repaired.

Mine is version 3.0 as well, but i never had any problem.

Do you happen to know where we can have more information about this 'rectifier bug' ? Is that something easy to fix by ourselves ?

Easy fix for any capable hobbyist...although the soldering might be challenging for those not experienced in lead free solder rework.
This will provide guidance on the rectifier bridge failures and fixes:
https://www.eevblog.com/forum/repair/siglent-spd3303x-e-reboot-problem/

[orzel]

Easy fix for any capable hobbyist...although the soldering might be challenging for those not experienced in lead free solder rework.
This will provide guidance on the rectifier bridge failures and fixes:
https://www.eevblog.com/forum/repair/siglent-spd3303x-e-reboot-problem/

Ah, indeed, doesn't seem difficult. I might even have a working version despite "3.0" being mentionned in the the about window.

I'm not a real "dave's fan", i haven't opened it yet 

 I haven't even hacked it, i don't have the need for added precision, and it worked so well so far... "if it ain't broken, don't fix it"

[tautech]

I haven't even hacked it, i don't have the need for added precision, and it worked so well so far... "if it ain't broken, don't fix it"

100%

AFAIK Siglent got a bad batch of those tiny 2A circular bridges and then we started having the odd failure so they they changed the PCB layout to accommodate a more robust bridge, 4A IIRC.

[rolfdegen]

I'm back to the old firmware and have no failures. The question remains, why does the output channel in the new firmware turn off the output channel after a while? I tested with load (12V/50mA) on CH2 and tested without load. It switches off on all attempts.

[tautech]

I'm back to the old firmware and have no failures. The question remains, why does the output channel in the new firmware turn off the output channel after a while? I tested with load (12V/50mA) on CH2 and tested without load. It switches off on all attempts.

Just looked back through your posts and only suggestion is the newer FW is placing more demands on the control PCB PSU and its old style rectifier bridge.

In your position I would swap it out for an uprated bridge modification.
The last one I did I drilled and tapped the main heatsink and ran a 4 wire AC/DC loom to it from the front panel PCB.

[rolfdegen]

Hallo electronic friends..
This bridge rectifier 2W06 from SEPRI is installed in my SPD3303X-E. The current temperature in the open housing is 41 °C after half an hour.

Siglent SPD3303X-E Frontpanel


2W06 Datasheet

[rolfdegen]

I have now closed the case. After three hours of operation without load, the bridge rectifier has a temperature of approx. 50°C. No heat points. The temperature is in the green range 

[rolfdegen]

A TL431C ensures good stability.

SPD3303X-E Front PCB


TL431C Datasheet