Products > Test Equipment

Siglent SDS1104X-E In-Depth Review

<< < (44/48) > >>

core:

--- Quote from: core on November 30, 2023, 08:02:54 pm ---I've tried too. So, another SDS1104X-E in test  ;D

Signal generator is Siglent SDG2000X

HiZ, no 50 Ohm terminator on scope.

For AM : 1 ch 10MHz, 10Vpp; 2 ch 10.05MHz, 2mVpp. Mixed with wave combine.
For FM : 1Vpp, 10MHz, FM dev 50kHz, FM freq 1kHz.

FFT settings:
1M, Hanning, Center freq 10MHz, 100kHz/div for AM and 50kHz/div for FM

Same results.

--- End quote ---


I was playing around with DHO1074 and some modulated signals and by mistake (bad contact terminator) I've found an explanation about the wrong FFT plot regarding SDS1104X-E.

I've used a 10MHz, 2Vpp signal, FM modulated, mod freq 500Hz, Deviation 50kHz (and 30kHz in the following examples).
If the input stage is not overloaded, it can't measure the frequency - see the hw counter in the up-right corner.
If the input stage is overloaded, the counter works. In the Dave's review the counter works, so we can presume that the SDS was overloaded, may be because of a bad contact terminator.

An overloaded DHO have an even more funny FFT plot for 30kHz deviation.

core:
By mistake, the DHO was with 20MHz filter activated.
Below the same FFT, overloaded, full BW. Still more funny with limited BW  :)

Performa01:

--- Quote from: core on December 23, 2023, 08:12:20 am ---I was playing around with DHO1074 and some modulated signals and by mistake (bad contact terminator) I've found an explanation about the wrong FFT plot regarding SDS1104X-E.
...
An overloaded DHO have an even more funny FFT plot for 30kHz deviation.

--- End quote ---
Thank you very much for solving this puzzle. I honestly could not figure how a flacky cable connection could cause such an implausible spectrum, yet the overload explanation makes a lot of sense.

Yet the damage is done. Some of the "experts" out there could yell out that the Siglent FFT is broken or the user interface is so awkward that Dave couldn't get it right.  :palm:

core:
For me, the SDS1104X-E is the reference I check when something looks suspicious with another oscilloscope. After numerous tests, I have come to the conclusion that it is a truly finished product, at least for my usual needs.
Even though I've bought better ones in the meantime, it will remain here if only as a collector's item. I like it very much.

That's why I remembered the problem and immediately made the connection when it happened.

Martin72:

--- Quote ---Yet the damage is done. Some of the "experts" out there could yell out that the Siglent FFT is broken or the user interface is so awkward that Dave couldn't get it right.
--- End quote ---

This was said after we were able to disprove it here, that something was wrong with the FFT.
Let's see what comes out of that corner now.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

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