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The Siglent SDG1000 and SDG800 thread

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tautech:

--- Quote from: jhufford on September 17, 2015, 02:34:55 am ---Maybe this isn't the proper place in the forum for this question, but I'm looking at the various Siglent arb gens. My question isn't about the 1000 or 800, but the SDG2122X.

The SDG2122X has a huge memory, and a claimed 1.2GSa/s for built in waves, but only 75MSa/S for the arb gen... But the 1000 series lists 125MSa/S with 125MSa/S for the arb gen. The 5000 series has 500 MSa/S for both built in waves and arb gen. 800 series has the same sample rate for both too.

Why such a huge difference on the 2122X? I can see where the arb gen's memory might be slower so it can't use as fast of a sample rate as the built in waves, but why would a $900 generator have 40% less arb sample rate than the $350 one, especially considering the 1000 and 5000 models have the same sample rate for both? Is the 2000 series just primarily showcasing its massive memory? Is it possible that Siglent's documentation is incorrect?

One explanation I can think of is that the Truearb eliminates jitter that DDS has had before, but at a price of a slower sample rate. Anyone?

(2nd question, the 1000 series has 7ns rise time while the 2000 has only 8.4nS, again, why would the more expensive one be less good.. Is the 1000 just a particularly good buy?)
Thanks

--- End quote ---
Good questions, let me see if I can throw some light on these.

As the SDG2000 series have just hit the ground and I suspect with preliminary FW Id guess there will be enhancements to come.  :-//

Rise time spec you have quoted for theSDG1000 series is in Pulse mode, you'd need to check the 2000 series figure was also in Pulse mode.
Sorry I'm away from my normal PC with all the datasheets at handy reach but you can check them from the Siglent America site.

dexters_lab:
In case anyone is keeping track of hardware

my new SDG1020 landed in the lab yesterday

HW version is 02-00-00-23-26
SW version is 1.01.01.37R3

manufactured Q3 2015

Rise time seems to be consistent across CH1, CH2, Square, or Pulse at about 7.5 to 8ns (1vpp @ 1khz)

I wasn't going to make any videos of this as there is plenty out there on youtube, unless someone wants to see something specific

ivan747:

--- Quote from: dexters_lab on September 23, 2015, 12:45:50 pm ---In case anyone is keeping track of hardware

my new SDG1020 landed in the lab yesterday

HW version is 02-00-00-23-26
SW version is 1.01.01.37R3

manufactured Q3 2015

Rise time seems to be consistent across CH1, CH2, Square, or Pulse at about 7.5 to 8ns (1vpp @ 1khz)

I wasn't going to make any videos of this as there is plenty out there on youtube, unless someone wants to see something specific

--- End quote ---

Can you try to replicate the square wave jitter issue? Congrats on the acquisition! May it last a long, productive life.

dexters_lab:

--- Quote from: ivan747 on September 24, 2015, 02:21:05 am ---

Can you try to replicate the square wave jitter issue? Congrats on the acquisition! May it last a long, productive life.

--- End quote ---

scope screenshots attached, infinite persistence & long memory for about 5 mins each on my DS1152

all measured at Square, 5vP-P 2.5v Offset, 50% duty.

i dont see any issues like in the traces detailed in the glitching thread

though the low part (at 0v) does look a bit noisy at the lower frequencies, my other older scope (a 50mhz digital/CRO) is blind to it

Groucho2005:

--- Quote from: dexters_lab on September 24, 2015, 08:10:35 am ---the low part (at 0v) does look a bit noisy at the lower frequencies
--- End quote ---
Have you tried to generate the same square waveforms in pulse mode? Could you post screen shots?

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