Products > Test Equipment
Siglent SPD3303D review
ScottyAU:
Thanks for the feedback Frank.
I can confirm there is no overshoot on channel 1 or 2 (just tested).
I'm happy :)
FrankBuss:
--- Quote from: nowlan on June 26, 2014, 12:34:57 pm ---would 1-1.5v kill anything though?
--- End quote ---
For example the datasheet of the ATmega128A says 6 V absolute maximum rating for operating voltage, but the chip doesn't know the datasheet :) and I'm sure it doesn't matter much if there is a short milliseconds long overshoot to 6.5 V. Once for a PIC I swapped Vcc/GND on a breadboard, wondering why it got really hot, and the chip survived it. A random datasheet for a 74LS00 says 7 V for supply voltage as its absolute maximum rating.
But I would suggest to connect your sensitive circuits only to one of the current limited channels anyway, and use channel 3 just for more robust things, like a fan.
ducatistou:
Hi,
Happy to join you for my first post on EEVBLOG, my favourite electronics blog and Youtube chanel.
I'm a french electronics and radio listener amateur, so excuse my approximative english !
I have an issue with my new PSU Siglent SPD3303D. Since i have installed the PSU in my radio shack, i have some RF perturbations in my RTL2838 SDR Radio with SDR-Radio V2.2 console
It's a brand new SPD3303D with last firmware and hardware I suppose because I don't have overshoot at turn on or <1 V
The PSU is well grounded, the RTL dongle is very far from the PSU (more than 10 meters) in an other room, but the PSU is not so far from the antenna with a HF LNA, 4 m high, and 15m of low loss cable to the RTL dongle
When the PSU is on and output chanels off, everything is ok
When I turn on a chanel I have a cyclic perturbation and when I turn on the 2 chanels I can hear the same perturbation at half frequency than the previous one. These interferences appear on single, serial or parallel mode
You can see the waterfall screenshots and the audio files here http://1drv.ms/1t2OKzL
I'll try to contact the support supply
The output signal on scope is not so bad with very few interferences in digital mode
Thank you if you have any suggestions
BR
Eric
FrankBuss:
That's interesting, because it is a linear power supply and not a switched-mode. Maybe it is some noice from the CPU board? I can't see the frequencies, but looks very regular, like the harmonics of the CPU clock.
Do you see these interferences with cables on the DC output connected or with no cables, too? If it is with cables, maybe you can fix it by adding some ferrite beads to the output, which might need some PCB scratching and soldering. If it is without cables, it might need some serious rework, like shielding the logic board, or maybe it injects noise in the mains input, because of insufficient filtering.
ducatistou:
Thank you for your reply
Siglent EU support has sent my request to their engineers, fast support answer ! Wait now for engineers answer ::)
I can see interferences with or without cables on DC output, may be a little bit stronger with cables.
Here is an exemple with SDRSharp near 120 Mhz where I guess the interferences stronger
I plugged the PSU on a Shaffner main filter with no difference, but it is a more a common than a differential RF filter
I also think it comes from the CPU board, but why only when an output is on ??? :-//
PS : this is an exemple without LNA, direct antenna (external discon) on RTL dongle
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