Rigol DS1102E Bandwidth problem

Rigol DS1102E is 100MHz bandwidth DSO, but we find when I input the 100MHz sinwave by Fluke 5820A (600MHz Oscilloscope calibrator ) to check that -3dB bandwidth, it is very crazy when I turning DS1102E dual channel ON! Also I find in dual channel ON with LONG memory mode that crazy performance is difficult to identify

Category:

Science & Technology

Tags:

• Rigol
• Bandwidth
• Problem

[dragonfly333yt]

sorry,command :ACQuire:SAMPlingrate?

[InstrumentVu]

Checked, when turn on dual channel that sample rate will drop to half by one channel, but still unclear what design to effect bandwidth performance

[hesperaux]

According to the specs for this model, the ADCs are staggered to achieve the 1GSa/s sample rate. This is only available in 1-channel mode. Using two input channels halves the sample rate. I believe long memory also halves it again, due to the memory chip limitations.

[InstrumentVu]

I very much agree with your idea, but the internal ADC is on the machine, who will open the view of the machine when he bought the machine

[InstrumentVu]

I very much agree with your think, but the ADC is on the internal, who will open the DSO to check when they bought it

[colinbeeforth]

Sorry, but this doesn't prove there is any problem with the DSO. If you set the controls so the internal digitiser is running at a lower speed than 1Ghz (yes, it's easy to do, read the manual for any DSO) you will get crazy alias problems. Any DSO can be made to show rubbish if you force it to display an aliased waveform. The demonstration may be straight up, but it could also be fudged to make the scope look bad. Without more information we cannot tell.

[InstrumentVu]

So you can accept a 100MHz oscilloscope bandwidth drop to 4xMH because the sampling rate issue?Because the relationship of my job, personally I can not accept this kind of specification

[wendeltech]

If you turn on long Memory, it's 500Ms/s when one Channel is on. I don't know what's happening if you switch the second on, maybe it's only half, 250Ms/s. I have seen on your video, that when you turn off sinx/x, the peaks have a distance of 4ns, seem to be 250Ms/s.

[joshstube]

Hello

Thank you for your post.

I am trying to decide between 2 brands of oscilloscope:

Owon & Rigol

I think Rigol has the stronger brand and I can't beat the 1G/sec RTS but . . .

a few features come at a lower price for the Owon - the bigest I'm looking at is the VGA screen.

Since Rigol hasn't bothered with VGA (QVGA even in their high end) should I care about this feature?

Or is it a gimmick for this type of application?

Thanks! Appreciate anyone's info that knows!

[dragonfly333yt]

And plz check up the actual samplingrate to command through terminal.like :ACQuire*SAMPlingrate?,sometim­es your actual sampling rate is 200MHz.Thanks.

[dragonfly333yt]

Hi.I can't understand your language,but lookin at your measurement.I think,a bit problem though,maybe at least you cut off DC,and sampling change to Average,and repetitive sampling(Equivalant-Time),and disable CH2.If you do,at least maybe also 100MHz level is within 3dB attenuation.Thanks.

[xchvcwryb]

RTFM



[igsaturation]

Good job. I think we all know now, and you've made clear, that the Rigol 1102E and 1052E have the same sampling rates and memory length. The input bandwidth limit is only for the analog front end, but it doesn't improve the scopes capability near the limit of its sampling capability. When you switched on Channel 2, the 1102E uses 500Ms/s, on long memory, its 250 Ms/s.

[hugos31]

rigol made in china