BUYING ANOTHER DSO. - Page 1
Forum section: electronics / testgear

author: MrsR
author_rank: Regular Contributor
timestamp: January 03, 2013, 03:00:22 pm
content: Hi! Guys,I am looking at buying a RIGOL 100mHz DSO and I was wondering how I buy it in Australia soDAVEgets his 6% cut.Can't afford the the 2000 model so it will have to be the 1000 E model.Have a question though " HOW MUCH VERTICLE NOISE BASE HAS IT "?I looked at the latest SIGLENT and it has 120Mv.The ATTEN has 40MvRIGOL I don't know!! I understand the 2000 model has a very low noise floor at least RIGOL is advertising that it does.I ask this as I do a lot of work with square wave and digital pulse and the more internal noise the wider the display line is and this can hide circuit noise. OK I am a bit picky but the Scope I have now the line is 3.5mm wide and this is the sixth one they have sent me under warrantythat's Hysteria not laughter. I would still like Dave to get his bit. Bribery Dave I need some help with some Mosfet drivers in the near future.Rachael

author: SeanB
author_rank: Super Contributor
timestamp: January 03, 2013, 03:48:47 pm
content: Buy from Trio Smartcal and say on order it was recommended by Dave of EEVblog. Then pay the 6% as a donation to Dave on the Feed Sagan link on the EEVBlog main page.

author: saturation
author_rank: Super Contributor
timestamp: January 03, 2013, 04:10:49 pm
content: I measured mine empirically, and noise floor of the 1052e is ~ < 500uV with the input amp at max gain. Note, noise rises with scope bandwidth. There are charts and a discussion in the archives about sample noises from different brands and bandwidth scopes.

author: ddrl46
author_rank: Regular Contributor
timestamp: January 03, 2013, 06:31:33 pm
content: Quote from: MrsR on January 03, 2013, 03:00:22 pm120 mega volts? Anyway, you might want to specify about which atten / siglent scope you are talking.

author: aghp
author_rank: Regular Contributor
timestamp: January 03, 2013, 06:53:33 pm
content: And also important question, how it is measured. Very easy there go to comparing apples and plumbs.I have looked Siglent SDS1072CNL and it looks like 5mV/div settings it have around < 1mV (measurement show 0.80 - 1.0mVp-pnoise without DSP filtering.Now it is also good to know that it looks like Siglent do not use cosmetic cleaning filters for "nice trace". (yes it may make it more fast wfms/s) and user can set adjustable digital filter separately to both channels and then you still may have full BW but reduced noise!)Then old: (today there is Owon 2.8.2 and even (marginally) less noise)Here some test with old workhorse Tek TDS520A and Owon SDS7102 (not V2.8.2) face to face..This is good to read also:http://cp.literature.agilent.com/litweb/pdf/5989-3020EN.pdf

author: nctnico
author_rank: Super Contributor
timestamp: January 03, 2013, 09:34:10 pm
content: Quote from: saturation on January 03, 2013, 04:10:49 pmLast but not least some scopes have special acquisition modes and bandwidth limiting which can reduce noise. All in all its difficult to compare one scope to another.

author: EEVblog
author_rank: Unknown
timestamp: January 03, 2013, 09:37:21 pm
content: You can't buy any test gear from Amazon in Australia unfortunately, so I don't get a cut.Buy from one of my nice advertisers like Emona and tell them you saw it here. I don't get a cut, but they might keep advertisingDave.

author: MrsR
author_rank: Regular Contributor
timestamp: January 04, 2013, 09:30:22 am
content: Quote from: EEVblog on January 03, 2013, 09:37:21 pmThat is laughter, Have been dealing with Emona, will tell them that went to Emona due to Dave.Sorry you don't get a commission but advertising isn't bad if you charge them enough.Thanks DaveRachaelTo the previous post"Mvyep! that's what doing posts at 3am does for you, although at could be right considering the problems I have had with the Digitech. I measure the noise at 1volt with the leads removed, set on measure, Auto, manual Trigger it, Same as Agilant etc do it. The one they replaced 6 times started life at 11 mv 3 months latter 40 mv, about 1 month 80 mv, another month 120mv, finally sent it back at 185mv, all their new ones show 120mv with 3.5 mm wide voltage line.I always try and support local business. If you don't when you need that little bit or such they wont be there.

author: MrsR
author_rank: Regular Contributor
timestamp: January 04, 2013, 09:37:04 am
content: THANKS FOR ANSWERING MY POST GUYS " GOTTA SUPPORT DAVESORRY I DONT FOLLOW ISO RegsmV

author: PA4TIM
author_rank: Super Contributor
timestamp: January 04, 2013, 10:55:34 am
content: MV is Mega VoltmV is milli VoltMv or mv do not exis. v is velocity.Mhz and mhz do not exist, MHz and mHz do.C is capaitance in F , c is light velocity in m/s, but C is also Coulomb, the unit for Q, charge.S is siemens, s is seconds so it is ms and Ms or mS and mSE is Elctric field strenght in V/m, here m is meterVolt, Ampere ect are named after people that is why we use captials, exeptions make the rule,e is Euleratto, femto, nano, milli are smaller then the unit so small lettersMega, Terra, Peta are bigger as the unit so a capital letter.Also used wrong are the h parameter for transistors. It is h not H and the subscript is important too, FE is for DC amplification, but fe is relative for small signal. So two totaly different things.If we follow these simple basics we are all talking about the same thing. You maybe write mHz out of lazyness or because you do not care or know and because you never work with mHz but some of us do and I have seen a discussion where the starter used mohm and everybody assumed he was talking MOhm. That took more then a page of non usable anwers. He meant mOhm ( milli Ohm, a small part of a Ohm)This is nothing to make jokes about or say you do not care or it is not important. This is so basic everybody should know and so important everyboy should apply these rules ( or at leat try, everybody can make mistakes)

author: saturation
author_rank: Super Contributor
timestamp: January 04, 2013, 12:00:13 pm
content: Yes, it might help to turn all filters: bandwidth limiters, acquisition modes etc., off, to make a comparison. However, in actual use those modes can help mitigate noise which is helpful since noise rises with bandwidth. For example, simple averaging will reduce the noise displayed, but its always good to begin with low noise from the start.Quote from: nctnico on January 03, 2013, 09:34:10 pm