Author Topic: Rigol DS1054 is a champion  (Read 3292 times)

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Offline ebclr

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Rigol DS1054 is a champion
« on: June 07, 2017, 09:21:19 AM »
I'm playing with ESP32 SPI mode with this program

#define CSPIN  5
#include <SPI.h>
unsigned char Icount = 0 ;
void setup() {
  pinMode( CSPIN, OUTPUT);
  SPI.begin(18, 19, 23, 5); // sck, miso, mosi, ss (ss can be any GPIO)
  SPI.setFrequency( 10000000 );
}

void loop() {
delay(10);
digitalWrite( CSPIN, HIGH);
SPI.transfer(Icount);
digitalWrite( CSPIN, LOW);
Icount++;
}

This program was  set to SPI Clock for 30Mhzm 10Mhz, 5Mhz and 1 Mhz

Then I put my Rigol DS1054Z to check the signal expecting to see a crap unuseful picture, But for my surprise, the pictures are very nice and readable, I would love to see other scopes on the same price range showing the same waveform
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This Rigols instrument is a beast,



 

Offline technogeeky

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Re: Rigol DS1054 is a champion
« Reply #1 on: June 07, 2017, 10:12:07 AM »
I agree with you, though I don't know why you expected a "crap unuseful picture". The 3db bandwidth of the scope is well known to be in the 130MHz+ range, so a 30 MHz signal should be no problemo!

Cheers!
 

Offline Dwaine

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Re: Rigol DS1054 is a champion
« Reply #2 on: June 07, 2017, 10:54:26 AM »
I have a spare Raspberry PI and was looking for a Python script that simulates a demo board for test signals on a scope.  I looked and did not find any.  I was actually surprised that there were none.

I could write a nice little Python program to simulate a Rigol test board,. I was just being lazy and thought I would grab one off the internet.  Was not so easy.

I also enjoy my Rigol scope.
 

Offline CustomEngineerer

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Online JPortici

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Re: Rigol DS1054 is a champion
« Reply #4 on: June 07, 2017, 04:09:38 PM »
i don't get it, what did you expect? If anything you showed that you can probe correctly
« Last Edit: June 07, 2017, 04:13:28 PM by JPortici »
 
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Offline ebclr

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Re: Rigol DS1054 is a champion
« Reply #5 on: June 07, 2017, 06:00:23 PM »
Pulses are well known for the huge amount of harmonics they generate, and a 10 Mhz pulse train on a 50 Mhz scope, show with that nice shape ( ok is a little slow rise time ) but is totally valid for a test or even decode by eyes.

If I put this same signal on my 100Mhz Owon SDS2702 will be much worse than that I can't even trigger the signal.

Basically, I'm  happy with my 399 USD scope, I don't need to expand 1500 USD or more, do work with microprocessor interfaces even pushing SPI to 10 Mhz. 

But I still desire a Tek MSO/DPO4000B but have no extra cash to expand, for my purpose is a luxury but maybe sometime I will do an emotional order

Will be a nice thing to see the same signal on other scopes, even the big boy's ones,
« Last Edit: June 07, 2017, 06:03:43 PM by ebclr »
 

Online JPortici

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Re: Rigol DS1054 is a champion
« Reply #6 on: June 07, 2017, 06:32:18 PM »
Quote
If I put this same signal on my 100Mhz Owon SDS2702 will be much worse than that I can't even trigger the signal.
pics? i find that hard to believe
 

Online Fungus

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Re: Rigol DS1054 is a champion
« Reply #7 on: June 07, 2017, 06:40:01 PM »
Yep, the (hacked) DS1054Z is an awful lot of 'scope for $400.

 

Offline tautech

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Re: Rigol DS1054 is a champion
« Reply #8 on: June 07, 2017, 06:41:14 PM »
Quote
If I put this same signal on my 100Mhz Owon SDS2702 will be much worse than that I can't even trigger the signal.
pics? i find that hard to believe
A bit of Holdoff and a falling edge trigger and it will trigger better than in the screenshots in the OP.
Avid Rabid Hobbyist & NZ Siglent Distributor
 

Offline rstofer

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Re: Rigol DS1054 is a champion
« Reply #9 on: June 08, 2017, 03:50:16 AM »
Quote
If I put this same signal on my 100Mhz Owon SDS2702 will be much worse than that I can't even trigger the signal.
pics? i find that hard to believe
A bit of Holdoff and a falling edge trigger and it will trigger better than in the screenshots in the OP.

Even just Single Shot would have helped.  A little decoding would have been nice.
 

Offline Dwaine

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Re: Rigol DS1054 is a champion
« Reply #10 on: June 08, 2017, 03:51:58 AM »
Thanks.   Reading it now.
 

Offline nctnico

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Re: Rigol DS1054 is a champion
« Reply #11 on: June 08, 2017, 03:53:40 AM »
Pulses are well known for the huge amount of harmonics they generate, and a 10 Mhz pulse train on a 50 Mhz scope, show with that nice shape ( ok is a little slow rise time ) but is totally valid for a test or even decode by eyes.

If I put this same signal on my 100Mhz Owon SDS2702 will be much worse than that I can't even trigger the signal.
Sounds more like operator error than a problem in the oscilloscope   >:D
There are small lies, big lies and then there is what is on the screen of your oscilloscope.
 

Offline ebclr

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Re: Rigol DS1054 is a champion
« Reply #12 on: June 08, 2017, 02:14:17 PM »
"Even just Single Shot would have helped"

The SPI contour is running, and you can watch dynamically the bit's changing on screen, this will never happen on single shot
 

Offline newbrain

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Re: Rigol DS1054 is a champion
« Reply #13 on: June 08, 2017, 03:25:14 PM »
Quote
This program was  set to SPI Clock for 30Mhzm 10Mhz, 5Mhz and 1 Mhz
The last screenshot looks like it's still at 10MHz, I'm curious about the actual behaviour at 30MHz.
I might try when I'm back home.
 

Offline ebclr

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Re: Rigol DS1054 is a champion
« Reply #14 on: June 08, 2017, 04:37:32 PM »
Here the image you asked for

Software runs on this hardware with  USB power




« Last Edit: June 08, 2017, 04:41:46 PM by ebclr »
 
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Online Rerouter

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Re: Rigol DS1054 is a champion
« Reply #15 on: June 08, 2017, 05:24:06 PM »
As your voltage is going below ground, your suffering from lead inductance, try the spring ground tip for that last one, i expect some resonably sharp edges

Personally i am a little biased in wanting to see how well it can go as a current project of mine will likely need to probe 48MHz spi, possibly up to 84MHz and things in that frequency ballpark. (Dont yet have a dso)
 

Offline ebclr

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Re: Rigol DS1054 is a champion
« Reply #16 on: June 08, 2017, 05:50:56 PM »
Still on regular probe but with a more decent ground path. I lost my spring ground somewhere


 
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Offline TK

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Re: Rigol DS1054 is a champion
« Reply #17 on: June 10, 2017, 04:49:30 AM »
Waiting for my ESP32 Thing card to test on my EDUX1002G (modded to DSOX), micsig TO1104 and Agilent 54622D
 
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Offline TK

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Re: Rigol DS1054 is a champion
« Reply #18 on: June 17, 2017, 08:25:44 AM »
MICSIG TO1104 100MHz 1GSa/s 4-channel Tablet scope.  I added one extra test with SPI @ 40MHz







« Last Edit: June 17, 2017, 08:28:05 AM by TK »
 

Offline TK

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Re: Rigol DS1054 is a champion
« Reply #19 on: June 17, 2017, 08:29:51 AM »
Keysight EDUX1002G modded to DSOX1102G.  2GSa/s 100MHz 2+1 channel.  Using extra digital channel to trigger on SCK (SPI clock).







« Last Edit: June 17, 2017, 08:31:50 AM by TK »
 

Online Fungus

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Re: Rigol DS1054 is a champion
« Reply #20 on: June 17, 2017, 08:47:02 AM »
Keysight EDUX1002G modded to DSOX1102G.  2GSa/s 100MHz 2+1 channel.  Using extra digital channel to trigger on SCK (SPI clock).

It would it nice to see the clock on an analog channel as well?  :popcorn:

What's on channel 1? Is that just crosstalk?
 

Online Rerouter

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Re: Rigol DS1054 is a champion
« Reply #21 on: June 17, 2017, 08:47:57 AM »
I'm guessing all the ringing is just from the probing method used? I'd be a little concerned seeing 0.5V of noise on a 3.3V signal.

Still glad to see that even with a high sampling rate, analog bandwidth will still bite me in the backside.
 

Online Fungus

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Re: Rigol DS1054 is a champion
« Reply #22 on: June 17, 2017, 08:52:58 AM »
I'm guessing all the ringing is just from the probing method used?

Yep. Don't try to infer anything from the ringing when you're using ordinary probes.

 

Offline TK

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Re: Rigol DS1054 is a champion
« Reply #23 on: June 17, 2017, 08:55:06 AM »
Keysight EDUX1002G modded to DSOX1102G.  2GSa/s 100MHz 2+1 channel.  Using extra digital channel to trigger on SCK (SPI clock).

It would it nice to see the clock on an analog channel as well?  :popcorn:

What's on channel 1? Is that just crosstalk?
Channel 1 is MISO (there is no Slave device connected to the ESP32 board who is acting as SPI Master)
 

Online Fungus

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Re: Rigol DS1054 is a champion
« Reply #24 on: June 17, 2017, 09:02:37 AM »
What's on channel 1? Is that just crosstalk?
Channel 1 is MISO (there is no Slave device connected to the ESP32 board who is acting as SPI Master)

Ok, so it's probably just crosstalk/coupling inside the ESP32.
 


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