Products > Test Equipment

LeCroy WaveSurfer 454 noise?

(1/3) > >>

ARF:
Hi guys!
I bought this oscilloscope and I do not like the picture on the screen. The line turns out to be very thick, full of some noise. This is fine?
Moreover, in some scanning modes, the line does not reach the end of the screen - this is some very strange defect. I did a factory reset and it didn't change anything.

I took screenshots
- built-in calibration signal and the sweep reaches the end of the screen.
- built-in calibration signal and the sweep does NOT reach the end of the screen.
- maximum gain (input shorted to ground)
- minimum gain (input shorted to ground)

Martin72:
Hi,

Actually I got a WS422 here, so I could directly compare it to your scope pics.
Noise seems to be the same - and reduced when using bandwithlimit, and more reduced with Eres.

Edit1: Pics wil not be posted in the order I´ve uploaded them....why...
Edit2:


--- Quote ---- built-in calibration signal and the sweep does NOT reach the end of the screen.
--- End quote ---

Have you checked the timebase/acquistion settings ? 

james_s:
Are you sure the noise is not actually there? DSO traces tend to look a bit noisy because they let you see noise that an analog scope doesn't display.

ARF:
Yes, indeed a direct copy. I have owned an Agilent Infiniium 54832D for a long time and it works differently, the image is much cleaner.
I already managed to disassemble this LeCroy a little. I noticed that cheap SMD aluminum capacitors are used on all boards (tantalum capacitors are everywhere in Agilent, except for the processor board and power supply), I noticed that a couple of capacitors have already swollen on the processor board (they are high quality, but worn out).
Either it works like that at all, or the capacitors have degraded, but our oscilloscopes have an identical picture. Weird...

By the way, since you own your LeCroy for a long time. Have you upgraded the processor, memory and SSD yet? I noticed that the motherboard is made on the basis of VIA CLE266, which means that we can install Tualatin-S (512K cache!!) up to 1.4GHz, which is much better than the regular Celeron Coppermine 850MHz. I also have 512MB of memory installed, but the motherboard must support up to 2GB.

Have you done any other upgrades? Maybe you can unlock some options, update software, BIOS or something else?

I don't understand what can be configured...

Martin72:

--- Quote ---the image is much cleaner.
--- End quote ---

Could have to do with the amount of memory.


--- Quote ---By the way, since you own your LeCroy for a long time. Have you upgraded the processor, memory and SSD yet? I noticed that the motherboard is made on the basis of VIA CLE266, which means that we can install Tualatin-S (512K cache!!) up to 1.4GHz, which is much better than the regular Celeron Coppermine 850MHz. I also have 512MB of memory installed, but the motherboard must support up to 2GB.
--- End quote ---

The scope I got since appx 3 weeks, before I´ve used it from time to time in the last 16yrs at work - We´ve sorted it out and I took it to home.. ;)
It needs some cleaning, fan exchange, and randomly a failure appears that I want to fix.
Then looking for hardware tuning.. ;)


--- Quote ---Have you done any other upgrades? Maybe you can unlock some options, update software, BIOS or something else?
--- End quote ---

2 weeks ago I´ve unlocked the advanced trigger package, math package also....

Navigation

[0] Message Index

[#] Next page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod