SIGLENT SDG800, New Wave/Arb Gen ?   - Page 1
Forum section: electronics / testgear

author: Terry
author_rank: Contributor
timestamp: May 23, 2014, 06:59:58 am
content: I'am total newbie hereso maybe this topic has some mistakes.spotted on the SIGLENT website SDG800.http://www.siglent.com/en/product/detail3.aspx?id=100000003692187&nodecode=119008003Is it a new product?ModelSDG805 SDG810 SDG8305MHz 10MHz 30MHzMain Features:Advanced DDS technology,125MSa/s sampling rate, 14bit vertical resolutionSingle channel output, 5 kinds of standard waveforms, built-in 46 kinds of arbitrary waveforms (including DC)Complete modulation functions: AM, DSB-AM,FM, PM, FSK, ASK, PWM, linear/logarithmic sweep and burstInnovative EasyPulse technology, can output pulse of low jitter, quick rising/falling edgeStandard interfaces: USB Device, USB Host, support U-Disk storage and software updateProvide 10 nonvolatile storage spaces for user’s arbitrary waveformsBe capable of seamlessly connected to SIGLENT Digital Storage OscilloscopeConfigurable with powerful arbitrary waveform editing software EasyWaveinherits main features from SDG1000, inserting EasyPulse tech from SDG5000.Siglent explained that EasyPulse tech is an algorithm of pulse generation innovated by Siglent. Based on this new tech, SDG800 can generate pulse of low jitter, quick rising/falling edge regardless of frequency effect, while the duty cycle, edge and pulse width could be widely and accurately adjusted. The built-in EasyPulse tech makes SDG800 a professional pulse signal generator.I made a sheet to compare the data of pulse.My question is, What is use of the Easypulse tech? Is it like SiFi tech of RIGOL DG1000Zhttp://www.rigol.com/prodserv/DG1000Z/or like Agilent 33500B Trueform technologyhttp://www.agilent.com/about/newsroom/tmnews/background/33500B/?

author: jpb
author_rank: Super Contributor
timestamp: May 23, 2014, 09:58:06 am
content: Quote from: Terry on May 23, 2014, 06:59:58 amEasypulse was, I think, a response to Agilent's TruForm though it is only a much reduced subset of TruForm applying only to pulses. SiFi I think was a response to both EasyPulse and TruForm.TruForm itself was a development to try and get the advantages of traditional fixed clock DDS (cheap, only a fixed image reject filter needed, rapid sweeping) whilst also getting the advantages of a variable clock DDS like a Tabor WW1072 (very low jitter, the ability to sequence data in memory and have loops rather than just feed the data from memory at a fixed rate).TruForm digitally filters, adds interpolated in-between samples and then redecimates to the fixed output sample rate with additional output filtering optionally applied. It is a clever system and I suspect is protected by various patents as well as being technically challenging to implement. As well as having very low jitter it also avoids skipping points and allows sequencing just like a variable clock arb.Easypulse is a much simpler scheme just applying interpolation to simple pulses but it does seem to reduce jitter and allow a much wider range of pulse slopes and so on than a standard DDS like the Rigol DG4062 for example.

author: tautech
author_rank: Super Contributor
timestamp: May 23, 2014, 10:10:03 am
content: QuoteRelatively new.It is based on the SDG1000 series, but only 3 models in the range whereas the SDG1000 has 5.The 800 series has 1 output vs 2 for the 1000 series800 series has the same USB device & host interfaces but no optional GPIB.Nor does it have a frequency counter BUT it is priced accordingly.

author: Electro Fan
author_rank: Super Contributor
timestamp: May 23, 2014, 01:21:01 pm
content: Quote from: jpb on May 23, 2014, 09:58:06 amjpb, Thanks. Any chance you can talk further about your impressions of SiFi? What do you see as the main advantages of the DG1000Z series vs. the DG4000 series? The Rigol 1000 has more memory but what are the features or performance advantages that are made possible by SiFi? Thanks, EF

author: jpb
author_rank: Super Contributor
timestamp: May 23, 2014, 02:17:52 pm
content: Quote from: Electro Fan on May 23, 2014, 01:21:01 pmI'm sorry but my only knowledge is from what I read in the published documents mainly the data sheets - personally I'm still looking and have been trying to decide between a second hand Agilent 33522A or a new (but discounted) Tabor WW1072.Rigol have not really given any details of SiFi that I've come across and Siglent haven't really given details of their system either other than to demonstrate it. Agilent have been more explicit with TruForm giving a block diagram in one of their white papers.The very short memory on the DG4000 series does impose restrictions on things like the available possible pulse shapes and frequencies. It also gives the Rigol a relatively high jitter which is compensated for by the fact that the sample rate is high at 500MS/s (the jitter is 500psecs which is essentially one half sample every odd wave - the sample spacing is 2nsecs). The DG1000Z has a sample rate of only 200MS/s but the jitter is reduced to 200psecs but this is rms. It might be achieved by using the much longer memory i.e. the peak-to-peak jitter might be one sample point or 5 nsecs but spread over several cycles to give just 200psecs rms whilst the DG4000 series might have a lower peak-to-peak jitter of 2 nsecs but not the memory to spread it out.The thing to beware of with Rigol and Siglent is the frequency restrictions at higher amplitudes. The Siglent is better than Rigol in this respect. But if you want to get the full 10Vpp on the DG1000Z series you're limited to just 10MHz even with the DG1062Z which has a headline BW of 60MHz. This will also affect the rise time.What Rigol do is have different gains for the amplifier - I've studied the Rigol DG4000 more than the DG1000 series. The DG4000 series has a switch over for amplitudes above 4V I think where the bandwidth drops from nearly 150MHz to around 60MHz (there is a fixed GainBandWidth product for the amp, I think the gain is around 4.5 for lower voltages and 11.25 for the higher voltages).If you want to make an educated decision it is worth reading up on DDS in general and its pros and cons - this is a good article though it is quite old:"Choosing a waveform generator:The devil is in the details" by Dan Strassberg(If you google it you'll find it, I had problems trying to setup a link without stupidly long URLs.)

author: Terry
author_rank: Contributor
timestamp: May 26, 2014, 01:07:57 am
content: Quote from: tautech on May 23, 2014, 10:10:03 amThe price is herehttp://www.tequipment.net/Siglent/series_sdg800-series/SDG805 $248.00SDG810 $282.00SDG830 $332.00and on siglent.eu websitehttp://www.siglent.eu/waveform-generators/sdg-800-series.htmlSDG805 €189.00SDG810 €219.00SDG830 €259.00

author: FLY_2009
author_rank: Newbie
timestamp: May 26, 2014, 03:40:47 am
content: the price looks reasonable for a arbitrary waveform generator

author: rf-loop
author_rank: Super Contributor
timestamp: May 26, 2014, 10:05:51 am
content: Quote from: Terry on May 26, 2014, 01:07:57 amIncluding tax SDG805 €228.69