hybridfree/eevblog-posts huggingface dataset:
Brand New HP scope comes with expired calibration paper - Page 1
Forum section: electronics / testgear

author: kirkpennock
author_rank: Newbie
timestamp: March 29, 2013, 05:11:55 am
content: Im just wondering if this is normal or what, I bought a new HP scope from Allied Electronics, and it sat on the shelf so long that the calibration has expired. They are offering to let me return it or let them send it to HP for calibration, and will take about 6 weeks.Any ideas, maybe something Im not thinking of?Im probably just going to keep it. It is the DSOX3014A. My first new scope purchase ever.Thank you

author: vk6zgo
author_rank: Super Contributor
timestamp: March 29, 2013, 05:14:13 am
content: If it is a HP,it must be quite old,as the test equipment has been Agilent for some years now.

author: aparlett
author_rank: Regular Contributor
timestamp: March 29, 2013, 05:36:46 am
content: It is probably a scope, that was not paid for by some other customer and you got it.

author: EEVblog
author_rank: Unknown
timestamp: March 29, 2013, 06:55:18 am
content: Well, you only have the two options there, or the third option of doing nothing.These things have two years cal interval now, so it's been on the shelf for 2 years?If you can afford the 6 weeks, then maybe it's worth doing, but really these things don't go out of cal.6 weeks seems a bit stuff, ask them for a loaner in the mean time.
Rigol scopes + ethernet + telnet server?  - Page 1
Forum section: electronics / testgear

author: Transistorfips
author_rank: Newbie
timestamp: March 25, 2013, 03:23:45 pm
content: Hi guys,I'm tinkering with my DS2072 a bit. For easy com I first tried to connect via telnet as with my 34410A. But - fail. Also I haven't found any information about that in the manual. It seems the only way to communicate is to speak http. So how - if no telnet server is available(?) to do this? http post or something?Transistorfips, GER

author: Wim13
author_rank: Frequent Contributor
timestamp: March 25, 2013, 07:37:04 pm
content: No, it has no telnet , only a http page for just for infoIt has some ports , more info see the following post:https://www.eevblog.com/forum/projects/software-tips-and-tricks-for-rigol-ds200040006000-ultravision-dsos/orhttps://www.eevblog.com/forum/testgear/first-impressions-and-review-of-the-rigol-ds2072-ds2000-series-dso/
Keithley 2110 - Page 1
Forum section: electronics / testgear

author: zaoka
author_rank: Frequent Contributor
timestamp: March 24, 2013, 12:34:51 am
content: Did not see that Keithley released new 5.5 digit multimeter for under $600..http://www.keithley.com/products/dcac/dmm/broadpurpose/?mn=2110-120Did anybody come across one of these?Specifications are very good for that price range.

author: skipjackrc4
author_rank: Regular Contributor
timestamp: March 24, 2013, 01:38:01 am
content: Wow, that is a good price. I have enough meters, though, or at least I keep telling myself that...

author: zaoka
author_rank: Frequent Contributor
timestamp: March 24, 2013, 03:10:56 am
content: ahahah me too...I was thinking to buy HIOKI DT4282 and come across new Keithley...

author: Bored@Work
author_rank: Super Contributor
timestamp: March 24, 2013, 08:50:08 am
content: It is on the market for some time. Compare it to the Picotest M3510A and you get the idea that it is rebadget. OEM is likely Array. AFAIK it was released by Keithley around the time they tarted up the company to sell it to the evil Danaher corporation.

author: Unknown
author_rank: Unknown
timestamp: March 24, 2013, 11:26:30 am
content: Probably similar to the 2100, which was not well received. Stick to the 20xx series, these are actually designed by Keithley.
Anyone used the serial decoding function on the Hameg HMO1022 scope? - Page 1
Forum section: electronics / testgear

author: djsb
author_rank: Super Contributor
timestamp: March 23, 2013, 11:47:23 am
content: Hi,I've tried to follow the instructions in the user manual but ended up getting confused. All I want to do is display a screen of ASCII data (a simple helloworld message) that I send to a PC from a PIC. When I tried to do this the message would whizz across the screen and I could not freeze it to examine it in more detail. Does anyone have any tips on how to set up the scope properly for this?Thanks.David.

author: jpb
author_rank: Super Contributor
timestamp: March 23, 2013, 12:06:38 pm
content: They demonstrate it in the Watt Circuit review video:this might be easier to follow than the manual.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: March 23, 2013, 12:33:54 pm
content: Quote from: djsb on March 23, 2013, 11:47:23 amSounds like you're not triggering properly - are you in Auto trigger mode?

author: djsb
author_rank: Super Contributor
timestamp: March 23, 2013, 12:57:43 pm
content: Quote from: mikeselectricstuff on March 23, 2013, 12:33:54 pmMy first mistake is to post this topic without having the instrument in front of me (they are at work) so I can't try it and now I'm on leave for two weeksI was looking for some indication of correct triggering but there are a confusion of menus to go through to set this up.Consider this a semi inactive topic until I can have another go.Thanks.

author: Hydrawerk
author_rank: Super Contributor
timestamp: March 23, 2013, 02:42:18 pm
content: Well, these Hameg scopes are for people, who need asmall(but still quite powerful) scope... I would not buy it. The knobs and buttons are a bit confusing.
TTI TG215 square waves not square - Page 1
Forum section: electronics / testgear

author: Dagon
author_rank: Regular Contributor
timestamp: March 22, 2013, 10:35:45 am
content: So I picked up a second hand TG215 from ebay for cheap as I'm going to be playing around with some filters.Below 30Khz the output can best be described as 'wonky'. Take a look at the screenshots. Triangle waves don't appear to sufficiently pointy either though sine wave looks ok at first glance. Also the output doesn't seem very stable at any speed with the waves oscillating gently around the screen.I've zero experience experience of function gens up to this point. Am i expecting to much at these speeds?And while I'm bitching the symmetry knob is broken (so much for 'excellent condition') Dead pot maybe? I'm not see any voltage across it.

author: Rerouter
author_rank: Super Contributor
timestamp: March 22, 2013, 10:40:49 am
content: out of curiosity have you adjusted the compensation capacitor on your scope probe? it may not be causing the majority but may be adding to the 20Khz waveform,as for not seeing any voltage across the symmetry pot, that doesn't sound like an open pot, more like a damaged component or supply rail in the device, as if it was open circuit it should have a voltage across it,

author: Dagon
author_rank: Regular Contributor
timestamp: March 22, 2013, 10:56:14 am
content: No, I haven't. I'll tweak that this evening and see what happens.

author: Rerouter
author_rank: Super Contributor
timestamp: March 22, 2013, 11:10:24 am
content: use your scopes cal output, or a known working signal gen though, not the gen in question....

author: Dagon
author_rank: Regular Contributor
timestamp: March 22, 2013, 11:49:18 am
content: Oh it'll be the cal output, there aren't any other function gens in my immediate vicinity, working or otherwise! I did adjust it when I got the scope but that was quite a while ago.

author: Dagon
author_rank: Regular Contributor
timestamp: March 23, 2013, 12:44:08 pm
content: In case anyone every comes across anything similar it turns out the problem was a test leadIt took much messing around until it occurred to me to swap it out. Live and learn.
BWD magnetic deflection oscilloscope. - Page 1
Forum section: electronics / testgear

author: GK
author_rank: Super Contributor
timestamp: March 21, 2013, 11:46:47 pm
content: Hello all.Probably 30 years ago or more the now long defunct Australian test equipment manufacturer, BWD Instruments, made an oscilloscope with a large, magnetic deflection television CRT. It was marketed as an educational instrument for demonstration purposes. From memory the bandwidth was really low (15kHz or so), due to the inductance of the deflection coils and the difficulty driving them at high frequencies. I believe the deflection coil drivers were I-out amplifiers; the output voltage swing capability/compliance therefore limits the high frequency response as the coil reactance rises. It was a great scope for class demonstrations of Lissajou (spelling?) figures.Does anyone remember this scope from their TAFE/Uni days and remember the model number? I’d ultimately like to track down a service manual or schematic for study, as I’d like to build my own equivalent, using a discarded CRT television as a base. An X-Y oscilloscope built this way would be the perfect display device for my analog computer.EDIT:The old BWD model looked very much like the unit Hydrawerk posted here (but with the CRT not orientated vertically):https://www.eevblog.com/forum/testgear/the-most-weird-and-funny-dso-metrix-mtx3000/msg205877/#msg205877
variac transformer question - Page 1
Forum section: electronics / testgear

author: radiogeek97
author_rank: Regular Contributor
timestamp: March 22, 2013, 05:05:55 am
content: i was wondering could a variac transformer function function as an effective isolation transformer. i wanted to mains isolate some devices before i test them with my scope i dont have an isolation transformer bout have access to a variac.thanksjohn

author: Psi
author_rank: Super Contributor
timestamp: March 22, 2013, 05:09:22 am
content: no, variacs provide no isolation.Here's a diagram of the wiringAs you can see, the input and output are connected.

author: digsys
author_rank: Unknown
timestamp: March 22, 2013, 05:10:07 am
content: Absolutely NOT !! A Variac has one side Referenced t the output ie it's an auto-transformer.Sorry, you'll need an isolation transformer.

author: grenert
author_rank: Frequent Contributor
timestamp: March 22, 2013, 05:17:52 am
content: There are a very few variacs which have isolation, but nearly all variacs DO NOT have isolation. So, most likely your variac will not be isolated.One model which has both variable AC and isolation is the BK Precision 1653A:http://www.bkprecision.com/products/power-supplies/1653A-150v-2a-ac-power-supply.htmlAnother is the Global Specialties 1505:http://www.alliedelec.com/search/productdetail.aspx?sku=70156612

author: radiogeek97
author_rank: Regular Contributor
timestamp: March 22, 2013, 10:33:49 am
content: thanks fellas i appreciate the help. i am sure the variac my neighbor has is not the one of the very few that provides isolation. I guess i will check ebay for a resonable isolation xformer.thank you all !
Look for advice on agilent osciloscope - Page 1
Forum section: electronics / testgear

author: hys8312
author_rank: Newbie
timestamp: March 20, 2013, 12:38:25 am
content: Hi all,I am thinking about buying an Agilent oscilloscope for my own electronic lab. I am an embedded software engineer and want to get better understanding of the circuit boards I deal with everyday from my work. I already bought power supplies, multimeter, and a soldering station. The next thing to buy will be an oscilloscope. I watched Dave's review on Agilent 2000 series and loved it. I think 100MHz will be enough for my need, but not really sure if I need to buy MSOX2012A or DSOX2012A . The former has 8 digital channel but around $800AUS dearer than the latter. As I already have a around $300 USB logic analyser which I quite like, is it worth to pay additional amount on digital channels on the oscilloscope? Any advice is welcome. Thanks in advance.

author: PChi
author_rank: Frequent Contributor
timestamp: March 20, 2013, 04:31:33 pm
content: I've not had experience of that particular mixed signal scope. When looking at combinations of digital and analogue it can be useful to trigger the Oscilloscope from a Logic Analyzer, useful for glitches, digital - analogue converters etc. Does your Logic Analyzer have a trigger output which can be connected to an Oscilloscope External Trigger input? I guess that the MSO can do this which can be useful. They are rather limited compared to a full blown Logic Analyzer though that can be programmed to trigger off complex parallel data sequences and, with the right accessory, serial data sequences.
Agilent case study - Page 1
Forum section: electronics / testgear

author: PetrosA
author_rank: Frequent Contributor
timestamp: March 18, 2013, 02:40:53 am
content: Yep, I'm tooting my own hornI don't get to very often, and almost never as an electrician, so when I found out some of the field testing I had done for Agilent was being used in a case study, and that it mentions me and my company by name, I was shocked!Anyway, I owe a lot to Dave and this forum for educating me to a lot of things about test gear that I wouldn't have know otherwise and I wanted to send out a shout of thanks to Dave and everyone here and share the case study for anyone who's interested. It deals with their U1177A Bluetooth module and how I used it on a troubleshooting call.http://cp.literature.agilent.com/litweb/pdf/5991-2084EN.pdf

author: EEVblog
author_rank: Unknown
timestamp: March 18, 2013, 02:50:29 am
content: Agilent need to show you some hardware love I thinkDave.

author: larry42
author_rank: Regular Contributor
timestamp: March 18, 2013, 11:48:29 am
content: Hei, congrats and nice story. How long does the U1177A batteries last in practice (and at which logging rate) - I've been thinking of getting this myself to monitor AC line voltage, which dips a lot in my lab...

author: PetrosA
author_rank: Frequent Contributor
timestamp: March 20, 2013, 03:38:53 am
content: In my work, I haven't left the datalogging on long enough to kill the batteries - usually an hour or two at the most gives me what I need. The most common way I kill the batteries is by not noticing that the module turned back on when I put the meters back in the case... I keep lots of spare AAAs on my truck now
cheap "second" scope - Page 1
Forum section: electronics / testgear

author: datacanMat
author_rank: Newbie
timestamp: March 22, 2013, 06:11:28 pm
content: I am a hardware guy who is looking for a cheap tool I can give the firmware desk when they need to see if their serial port is turning on. It is frustrating to have to pause what I am doing and move the scope to their desk just to probe some digital lines for 5 minutes. I am hoping there is a cost effective tool that they can keep to look at the digital lines to see if the lines are switching properly or if there is line contention or other common embedded digital issues. We have a couple of decent scopes around for serious analog investigation, but that is overkill in these cases. A cheap logic analyzer will not quite do it as it won't necessarily see line contentions. My first thought is a USB scope. Everyone says they aren't worth the money, but in this case where a lot of the analog issues are not a concern (noise, input range...) I am hoping there might be a niche. The only real important feature is the speed to pick up a 12 MHz SPI signal.I have been searching around this morning and the best candidate I can find ishttps://www.sparkfun.com/products/9263] https://www.sparkfun.com/products/9263 which is more features then I need but I haven't been able to find anything cheaper that does anything useful.Can anybody suggest anything.

author: rdl
author_rank: Super Contributor
timestamp: March 22, 2013, 06:51:51 pm
content: I bought a Digilent Analog Discovery Kit from Newark a couple of weeks ago. They have it on special for $99, not sure how much longer that will last. Regular price is $250 (USD). If you're in the U.S. you might check it out. At $99 it's a good deal, at $250 not so good.http://www.digilentinc.com/Products/Detail.cfm?NavPath=2,842,1018&Prod=ANALOG-DISCOVERYhttp://www.newark.com/digilent/410-244e/design-kit-analogue-discovery/dp/62W3442?Ntt=62W3442&COM=celebrating-engineersYour link is kind of messed up btw
Creatronica  - Analog ESR Meter " Capacheck Mictron " [ Preinspection Video ] - Page 1
Forum section: electronics / testgear

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: March 18, 2013, 09:38:51 pm
content: Hello Folks ,Some Of You Know That Lynx Is a Country Distributor For Creatronica Brand Products In India.The " Capacheck Mictron " Is a Analog ESR Meter That We Ship Worldwide .This Video Is In English And It Explains What All We Do Before We Ship You The Goods . Also Note That This Is a Transformer Tester Also.Any Suggestions Please Pour Then So That We May Improve .Note :@ All : Hope you like the Video quality and sound loudness .@ All : This video also explains you how to use the product ,Instead of the resistance useA capacitor and thats it .
where can i find new rigol scope firmware? - Page 1
Forum section: electronics / testgear

author: ddavidebor
author_rank: Super Contributor
timestamp: March 15, 2013, 05:40:32 pm
content: hii'm looking for a recent 1052e firmware, i can't find anyting here or in the rigol site.where can i find a more recent firmware?

author: Bored@Work
author_rank: Super Contributor
timestamp: March 15, 2013, 06:08:20 pm
content: You need to ask rigol or your vendor. Rigol firmware is not made puplic available.

author: ddavidebor
author_rank: Super Contributor
timestamp: March 15, 2013, 08:17:47 pm
content: ok i've emailed, i hope to receive a answer tomorrow morning...
E3610A + Reversed Battery is a Bad Idea ! Help please :( - Page 1
Forum section: electronics / testgear

author: eevblogfan
author_rank: Frequent Contributor
timestamp: March 16, 2013, 07:16:03 pm
content: heyI was Charging my 12V 12AH Battery for ummm I think 3 Hours ...and then I was needed the supply for 12V fan ... so I used the supply of course ...But! - then when I finished and wanted to Charge my Battery .... I accidently plugged the Crock clips the wrong way ! and Bang !and the very first thing I saw Was the CC led on .so I immediately Dial the CC Knob and saw it correspond , Hence I Am 100% sure that the series Diod (MR854) is fusedSo I desoldered it out and now my Question :I have no access to buy that MR854 , but I Do have MUR415 , Does It suitable ?I am scared, can I put Forward Bias Shottky after R35,R36 ? ( or perhaps after R2 ? )the Schema is on the E3610A manual - page 16thank you in advance !

author: mzzj
author_rank: Super Contributor
timestamp: March 17, 2013, 01:45:57 pm
content: MUR415 is suitable. You can also test your power supply without this diode, it's only for protection and your power supply should work normally without it. Just don't try to charge batteries without it!Series Schottky diode would be nice in battery charging applications, but if you place it after R35, R36 it will only protect the output stage. You can still blow your MR854 to short-circuit and burn your pcb traces along with it.You were actually lucky if only damage was MR854 and your nerves.12v 12Ah battery is easily capable of burning every pcb trace and internal wiring between output terminals and the MR854.Next time when charging batteries I would just place the schottky diode in the power supply output and compensate the voltage drop by adjusting the voltage bit higher.

author: eevblogfan
author_rank: Frequent Contributor
timestamp: March 17, 2013, 04:15:52 pm
content: helloI know The supply is working fine because I could adjast the CC and the A meter corresponded accordingly ,I I did replaced the MUR854 with the MUR415 , I do know that putting the Shottky after R35,36 wil " only" protect the whole circuit besides any thing whoes reversd bias with the diod . but you indeed raised a great point - the traces !so I guess I'll build a speccial circuit *just* for that battery charging needthank you Mzzj
Self Contained Soldering Irons - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: March 16, 2013, 03:35:21 am
content: This may be a bit heritcal regarding bench equipment, but it's a fact of life for field service work. Over 35 years, we've been through many with relatively poor results...yes even Weller. By the 80's we settled on Ungar 7500 handles which are now Weller and invested in multipack heaters and tips which are now pretty much depleted. The original handles are actually still in very good condition with the silicon coated power cords, most over 20+ years old in great condtion. I've still got several carded "inside" tips. They actually made a better and durable product in a line powered and portable product. Over the years we tried both Weller and Antec and none had the field durability of the Ungars. Weller now calls these their own from what I gather. Heaters and tips are still available. Before I invest in a 10 pack of heaters and card of tips, I'm wondering if there's a one hung low knockoff or system that uses Hakko type tips and decent and dependable heaters and handles. The Weller option isn't cheap and our shop irons are pretty much Hakko compatible with a few WTCP type magnestat type stations still surviving. BTW, our foray into using Master/Weller butane irons was a total disaster and I have no interest in bothering with that avenue.Are there any decent quality, self contained import irons available that have a sustainable heaters and tips with silicon cords?

author: zaoka
author_rank: Frequent Contributor
timestamp: March 16, 2013, 04:31:24 pm
content: THere are few good ones:Den-on SS-8200 (US models used to have silicon cord, its easy to change to another cord. It heats up in about 20 seconds, has regulation of temperature and tips are lasting forever. We used this in our repair shop, basically if you use it every day (full time) its lifetime is about 2-3 year.Goot PX-201 never used this one, Goot is very good japanese brand.

author: staxquad
author_rank: Frequent Contributor
timestamp: March 16, 2013, 05:49:33 pm
content: Quote from: Dawn on March 16, 2013, 03:35:21 amYONGFENG YF-951 25~60W Adjustable Soldering Iron - is a knock off of the discontinued Hakko 993 (still available in Russia)Uses Hakko 900M series tips (cheap and good value 10 pack US $8.49 on ebay,http://www.ebay.com/itm/370727465867)Temp control indicated on the pencil is 200*C to 450*CComes at the exorbitant cost of US$15.70 (I paid $12.30, but that's another story) with free shipping from China (cheap and good value)Have been using mine (have 2) for maybe 6 monthsI dial it up to max for a few seconds then turn it down to required temp setting for instant useI don't know if it lives up to Ungar standards, but at that price, dread the thought, they are disposablehttp://dx.com/p/yongfeng-yf-951-25-60w-adjustable-soldering-iron-blue-black-ac-110v-2-flat-pin-plug-149153(buy 1 US$15.70 shipped; buy 3 USD$ 14.00 shipped/ea; buy 5 USD$ 13.90 shipped/ea)they have YONGFENG YF-951 with different tips at different prices ($15.70 to $14.10)
GW-Instek GPS-730 3GHz SA - Page 1
Forum section: electronics / testgear

author: olsenn
author_rank: Frequent Contributor
timestamp: March 15, 2013, 10:09:09 pm
content: I just noticed Instek has a cheap (albeit fairly crappy) 3GHz spectrum analyzer out. It costs under $1000 but doesn't have a tracking generator, only 100dbm sensitivity, and most notably crippling... a minimum 30kHz RBW.I still say the Rigol DSA-815-TG is the best SA for under 2k if the 1.5GHz limit is acceptable to you, but perhaps if you need to do 2.4GHz work this may suffice.
ATTN ATF20B English Set-up - Page 1
Forum section: electronics / testgear

author: ks1233
author_rank: Newbie
timestamp: March 09, 2013, 06:00:37 pm
content: Just purchased the ATTN ATF20B Function Generator, powered it up and everything seemed fine until I get to the screen menu - everthing is in Chinese. I look in the user manual that came with the unit and IT is printed in Chinese. I go to their website with the same luck - everything is in Chinese. After further searching, I make it to an EU website and finally download an english version, but it is so non-descriptive when it comes to setting the machine up for english language that IT is totally useless as well. Question: can anybody help me out here? If so, it would be greatly appreciated! Thanks in advance.

author: Herman
author_rank: Contributor
timestamp: March 15, 2013, 08:33:39 am
content: In Utility menu.

author: nctnico
author_rank: Super Contributor
timestamp: March 15, 2013, 10:13:02 am
content: How do you write that in Chinese?

author: ddavidebor
author_rank: Super Contributor
timestamp: March 15, 2013, 12:25:02 pm
content: Have you read the manual?
An interesting multimeter design: KYORITSU KEW MATE 2012R - Page 1
Forum section: electronics / testgear

author: Lightages
author_rank: Unknown
timestamp: March 15, 2013, 06:47:17 am
content: I have been looking at this multimeter a few times when browsing some online stores and it keeps getting my attention. It seems to be a great meter for general electrical and solar power installations. Does anyone have any experience with KYORITSU?http://www.kew-ltd.co.jp/en/products/multimeters/2012R.html$205 plus shipping from tme.eu

author: BravoV
author_rank: Super Contributor
timestamp: March 15, 2013, 07:01:21 am
content: Interesting open jaw current probe design.Curious about it's capability to reject spurious external magnetic field, cause even the ordinary closed loop jaw at "DC" current is still challenging.
Mastech power supply fuse blows intermittently - Page 1
Forum section: electronics / testgear

author: Vytautas
author_rank: Regular Contributor
timestamp: March 13, 2013, 08:13:05 pm
content: Hi, guys.Could someone help me with my Mastech power supply problem? I got a power supply Mastech 3005-2, similar to this:Mine has only one difference, - it does not have a separate constant 5V/3A output.The schematic that I found is this:http://img-fotki.yandex.ru/get/5701/dinamicvolt.61/0_48280_bd1a55c7_origThe power supply works OK. I have an oscilloscope and have tested the outputs - there is no overshoot or undershoot upon powering on. But occasionally the fuse (4A) blows when powering on. What could be the problem? Is it an inherent design fault or something else? Could I fix/improve it somehow? Thank you.

author: SeanB
author_rank: Super Contributor
timestamp: March 14, 2013, 07:13:58 pm
content: If it is the mains fuse replace with a slow blow 3.15A one, which should cure this. Most likely it is the surge current at switch on doing this.
Tektronix backwards probe compatibility - Page 1
Forum section: electronics / testgear

author: Parak
author_rank: Contributor
timestamp: March 14, 2013, 12:22:04 am
content: Anyone happen to know if the Tek 2xxx or even TDS series passive 10x probes are generally compatible with a Tek 485? As a new owner of the 485 without proper probes, I'd like to get some that better match its capabilities, and the probes for the later scopes are definitely easier to come by..

author: mazurov
author_rank: Frequent Contributor
timestamp: March 14, 2013, 12:32:22 am
content: I use P6139A on Tek 475A. Works quite well.

author: stratogazer
author_rank: Contributor
timestamp: March 14, 2013, 12:50:47 am
content: If input impedance = 1M ohm and capacitance is around 15 pF ( most Tek probes are) the compatibility won't be an issue.

author: BravoV
author_rank: Super Contributor
timestamp: March 14, 2013, 01:02:16 am
content: P6139A probe has compensation range only from 8pF up to12pF, so if your scope input is 15pF, its out of range.No biggie if you're not in precision measurements.Edit :Some references on old Tek probes :http://www.reprise.com/host/tektronix/reference/voltage_probes.asphttp://www.barrytech.com/tektronix/probes/tekprobes.html

author: warywolfen
author_rank: Newbie
timestamp: March 14, 2013, 06:58:16 pm
content: View a square wave using the probe. If you can make it look square by tweaking the compensation cap, it's OK. If not, and you can take the probe apart without damaging it, try putting a little (say, 5 pF ) cap in parallel with the comp. cap. By the way, whenever using a new probe with a 'scope, the compensation should be checked, and adjusted, if necessary.
GDS2062 Oscilloscope Question - Page 1
Forum section: electronics / testgear

author: Abunada
author_rank: Newbie
timestamp: March 13, 2013, 07:38:11 pm
content: Hi Guys,I decided to take apart my oscilloscope the other day just to check it out. When I put it back together, no screws were left which gave me some confidence that I did not hash something up, but I have a 2 wire connector coming from the on/off switch on the back (It is actually the switch's second throw) that does not appear to go anywhere. Actually there is one place in the power supply board that appears to be where it should be connected, but if I plug it in, the oscilloscope stops working and a weird popping sound comes out. Without it connected it works just fine.I am kinda bugged by that leftover connector, and I don't really recall whether it wasn't connected to begin with, So if one of you guys has the same scope, and would like to verify that this connector is actually not connected I would appreciate it! I have attached a photo of the scopes innards to show what I am talking about.ThanksAbunada

author: Stephenniall
author_rank: Contributor
timestamp: March 13, 2013, 07:51:27 pm
content: What Model & Brand is the oscilloscope ? Can you get the service Manual for it ?Otherwise i'd say leave it as it is. If it works fine without the switch don't connect it.StephenEDIT: Sorry, Just read the title properly. Did not see that the model number was there earlier. Sorry.

author: Abunada
author_rank: Newbie
timestamp: March 14, 2013, 04:38:49 am
content: I guess you are right I should have mentioned the name and brand in the topic content. Its GW-Instek GDS2062. I could not find a service manual on their website only a user guide.I still want to make sure it is not connected though.
EasyScope 3.0 XP and ATTEN ADS1102CAL+ USBTMC driver problem - Page 1
Forum section: electronics / testgear

author: Laco
author_rank: Newbie
timestamp: March 19, 2013, 08:27:47 pm
content: I have problem with installation EasyScope 3.0 XP version USBTMC drivers. Windows found New USB device ADS1102CAL+. After installed USB drivers from CD ROM drives windows don't install it. I'm downloads USB drivers from ATTEN.com.cn and have same problem.Need help how installed this driver.
LF Spectrum analyzer - Page 1
Forum section: electronics / testgear

author: Telstar
author_rank: Contributor
timestamp: March 13, 2013, 10:16:21 pm
content: I'm considering a spectrum analyzer, but I need it capable to perform at LF (at least 50hz) with low noise and very low THD (about -130db), up to 1Mhz or even few khz.Doing some googling, I came up to this:http://www.aaronia.com/products/spectrum-analyzers/NF-5030-X-Low-Frequency-USB-Analyzer/#detailsHas anybody used their instruments? The customer portfolio is impressive, mostly for EMC analysis, but this model seems to meet my needs.I'd like to know the noise and distortion specs, though.Other suggestions? New or used, usb or not, the budget is 1k, more or less.

author: free_electron
author_rank: Super Contributor
timestamp: March 13, 2013, 10:26:42 pm
content: DSA . they are (were) made for this kind of stuff.You can find used ones on fleabay for around 600$.
TENMA - 72-8795  - Page 1
Forum section: electronics / testgear

author: deisenberg
author_rank: Contributor
timestamp: March 13, 2013, 06:13:00 pm
content: I am looking at purchasing a new bench power supply and like the looks and features of the TENMA - 72-8795. But I don't know this brand at all and was hoping someone would comment on the quality of the brand as well as personal experience with one of there bench power supplies... thanks!!!Should mention that I am considering the B&K PRECISION - 1697, dave reviewed and it seemed OK. Two big differences are that this one only has one out put, but I save a $100..

author: mariush
author_rank: Super Contributor
timestamp: March 13, 2013, 06:26:20 pm
content: I bought 72-8695 and made a thread about it here:https://www.eevblog.com/forum/testgear/tenma-72-8695-2-x-32v-3a-5v-2a-mini-review-teardown/?topicseenIt looks good to me, I like it, works fine for my needs.

author: deisenberg
author_rank: Contributor
timestamp: March 13, 2013, 10:10:26 pm
content: Thanks for the reply Mariush.As it turns out the unit is just a rebranded Atten PPS3205T, at least it looks like one and the drivers are the same.
Multimeter probes for SMT work - Page 1
Forum section: electronics / testgear

author: electronupdate
author_rank: Regular Contributor
timestamp: March 17, 2013, 09:47:34 pm
content: Most multi meters come with a set of probes with tips that are simply too large for probing fine-pitch surface mount components.I went searching for better and got a set from a USA distributor, Digikey... I have been finding them very useful.A ultra short video, below:

author: nanofrog
author_rank: Super Contributor
timestamp: March 18, 2013, 03:04:25 am
content: The set I have is from a different company, but they're wonderful for small packages (Probemaster 8150 FWIW).

author: SLJ
author_rank: Frequent Contributor
timestamp: March 18, 2013, 03:22:49 am
content: I use a set of Pomona 5953A test leads. Needle sharp and the tips can be extended up to 3 inches.
High Voltage Probe Fluke 80K-40  - Page 1
Forum section: electronics / testgear

author: shadowcomputer
author_rank: Newbie
timestamp: March 11, 2013, 09:29:55 pm
content: I need a high voltage probe to measure voltage output of a fly-back transformer. I have been looking at the Fluke 80K-40, but it's kinda pricey. I was wondering if there is anything cheaper out there that is safe?

author: nicknails
author_rank: Regular Contributor
timestamp: March 11, 2013, 11:46:51 pm
content: How much voltage are you talking about? Ebay has a bunch of 80K-40 and 80K-6's depending on your budget. The prices seemed reasonable to me. I've used some high value resistors to make a poor-mans probe. I think it was a 1000M Ohm and a 1M Ohm, both were precision resistors. Won't have the accuracy of a professional probe, but does the trick for some hobby stuff.

author: bustedcap
author_rank: Newbie
timestamp: March 13, 2013, 08:55:57 pm
content: Watch Blog #85 and roll your ownhttp://www.eevblog.com/2010/05/08/eevblog-85-high-voltage-oscilloscope-probe-design/
20" CRO LanScope - Page 1
Forum section: electronics / testgear

author: BartManInNZ
author_rank: Contributor
timestamp: March 11, 2013, 10:34:15 pm
content: Made in England in the 1970's, this 4 channel LANSCOPE oscilloscope is a recent acquisition for testing and prototyping projects.Coming up next will be some photos with the cover off - exceptionally tidy condition, like it was kept in a clean-room or laboratory!If anyone can provide further information, schematics, history etc that would be much appreciated.

author: amyk
author_rank: Super Contributor
timestamp: March 12, 2013, 07:49:27 am
content: That is onehugescreen for a scope...With one that big you should try showing a video signal on it, or the YouScope demo.
What is the best Low-end(read cheap) USB Logic Analyzer? - Page 1
Forum section: electronics / testgear

author: tim1986
author_rank: Newbie
timestamp: March 12, 2013, 02:53:56 am
content: Hello,What is the best Low-end(read cheap) USB Logic Analyzer?I was looking at the Open Workbench Logic Sniffer:http://www.seeedstudio.com/depot/open-workbench-logic-sniffer-p-612.html?cPath=174or the Logic Shrimp v1 logic analyzer:http://www.seeedstudio.com/depot/logic-shrimp-v1-logic-analyzer-p-803.html?cPath=174What do you guys recommend?Thanks!-Tim

author: chibiace
author_rank: Regular Contributor
timestamp: March 12, 2013, 04:26:42 am
content: http://hackaday.com/2013/01/27/turning-the-stellaris-launchpad-into-a-logic-analyzer/this would be 12$, worth a try? otherwise you get a arm dev board out of it.

author: tim1986
author_rank: Newbie
timestamp: March 12, 2013, 05:06:03 am
content: I found this too:http://hackaday.com/2011/02/17/propeller-platform-logic-analzyer/I have a propeller board that might work.

author: casinada
author_rank: Frequent Contributor
timestamp: March 12, 2013, 06:18:40 am
content: If you need good software and support.www.saleae.comwww.usbee.comhttp://www.pctestinstruments.comOtherwise:http://sigrok.org/wiki/Supported_hardware#Logic_analyzers

author: GeoffS
author_rank: Unknown
timestamp: March 12, 2013, 06:37:48 am
content: This guys' done areviewof the Salea unit

author: amyk
author_rank: Super Contributor
timestamp: March 12, 2013, 07:38:32 am
content: Absolute cheapest would probably be the various Cypress FX2(LP) Saleae/USBee-like clones. 24MHz, 16 channels in Sigrok-supported mode. Sample depth limited by host memory.But what samplerate/number of channels/memory do you need? Any additional features (advanced protocol decoding, triggering, etc.)?
Rigol DS1102E bug? - Page 1
Forum section: electronics / testgear

author: reagle
author_rank: Unknown
timestamp: March 14, 2013, 04:08:11 am
content: Tried using the reference waveform function today on a brand new DS1102E and it worked about 5% of the time. The rest of it, it mainly produce some unintelligible noisy white band with seemingly random data in it. After I tried saving the waveform and then opening it form external media, I got the scope to crashAnd of course none of that would be reproducible when talking to Rigol tech support. The scope is running firmware 3.01 if I remember correctly, supposedly the latestOn a positive note, they actually have real humans pick up the phone and try to help you!Apologies for fuzzy pictures. Has anybody else seen this happen?Edit: or does anybody want to try crashing theirs? I can share the reference file
DS2200E / Easyscope - drivers and software - Page 1
Forum section: electronics / testgear

author: manicdoc
author_rank: Unknown
timestamp: March 11, 2013, 08:11:35 am
content: I know, darn long shot - but I'm gathering together my electronics kit and found my 'old' USB oscilloscope. Now I've got a driver to recognize, the lights come on so something initialised - but all the latest EasyScope programs I can get my hands on seem 'bound' to whatever device they came with. Which is annoying as they seem to see the DS2200E enough to tell me I have DS2200E but absolutely refuse to do anything with it.. argh!Basically if anybody has a version of EasyScope that will play nice and run on Windows 7 and talk to the DS2200E - that would be much appreciated. Or if there is something in Linux world that would do the same that would be equally good.Also trying to work out what I should let my better half buy for me in terms of electrical kit for my birthday - so if I can get this working I can focus on something else instead..Much thanks

author: manicdoc
author_rank: Unknown
timestamp: March 11, 2013, 10:29:45 am
content: Quote from: manicdoc on March 11, 2013, 08:11:35 amIt was a long shot and I scored!! After much additional Google diving with various phrases found an original mark I EasyScope zip file complete with manual on a crusty old website - installed and works a treat! phew! Not exactly the most fully featured USB scope going, but considering it would have gone in the bin otherwise, can't complain.Back to working out what I want for my birthday... hmm..
Hantek 1025G AWG now supported by Goltek Controller v1.0.5 - Page 1
Forum section: electronics / testgear

author: Mechatrommer
author_rank: Super Contributor
timestamp: March 10, 2013, 07:48:57 am
content: a little announcement for 1025G "already" or "soon to be" owners. Goltek Controller (v1.0.5) now supports the device by putting a dummy file 1025G.dat in the application folder. Without the dummy file, Goltek Controller will functions normally on Hantek DDS3x25 as usual, as before. The support is confirmed by our new friend here, and a 1025G owner (i wish i could name him but i wont i havent ask his consent i wish he will). He provided me the link to the driver and SDKhttp://www.hantek.com/english/down_list.asp?Unid=20... 1025G has the exact API except different dll name, so it was an easy fix. so here's the updated download link and help...http://www.soasystem.com/eng/goltek/download.htmhttp://www.soasystem.com/eng/goltek/index.htmps:He was testing it under Win7 64 bits and successfully commanded the 1025G device.I tested it under Win98 and Win7 32 bits, the app was running without error (but without connecting to the device)FWIW.
Agilent 34905A noob question - Page 1
Forum section: electronics / testgear

author: buton
author_rank: Newbie
timestamp: March 09, 2013, 02:32:07 pm
content: Hi guysMaybe you could help me with this...i bought thishttp://www.home.agilent.com/agilent/product.jspx?cc=US&lc=eng&nid=-33237.536880683&pageMode=OVto expand the inputs on my oscilloscope on a test procedure....unfortunately when i hook the signal i am measuring to the agilent mux and i see it on my scope, it seems that it adds and offset and also some deformation... i think i it is due to the fact that my scope input is 1 Mohm and the mux says somethign about 50 Ohm... if that is the case how do i fix it?thanks

author: Unknown
author_rank: Unknown
timestamp: March 09, 2013, 02:40:38 pm
content: The only way to get decent signal integrity (SI) with that thing is to go 50 ohm: terminate the signals from the mux in 50 ohm at your scope, using (in order of decreasing SI) the internal termination if present, a feed-through 50 ohm terminator, or a BNC tee with 50 ohm terminator. You will also need to feed the mux from a 50 ohm source, for example a 50 ohm signal generator, an active probe designed for 50 ohm inputs, or a restive divider probe as for example described by Howard Johnson or Doug Smith. Neither of these options are very nice for general-purpose low-frequency probing (eg. power supplies, audio).

author: KJDS
author_rank: Super Contributor
timestamp: March 09, 2013, 03:20:57 pm
content: What sort of signals are you probing, and does your scope have 50ohm input capability?
U1241A IR interface? - Page 1
Forum section: electronics / testgear

author: Harvs
author_rank: Super Contributor
timestamp: March 08, 2013, 09:53:49 am
content: I got one of the secondhand U1241A DMMs that triosmartcal were selling. Really nice meter at that price.Now that I've got it and looked closer at all the functionality, it seems a little odd that there's clearly the LEDs for an IR interface, yet Agilent don't seem to sell one? I would certainly use it if available.Or am I missing something?

author: BravoV
author_rank: Super Contributor
timestamp: March 08, 2013, 10:02:45 am
content: U1177A IR to Bluetooth Adapter ->http://www.home.agilent.com/en/pd-2090364-pn-U1177A/infrared-ir-to-bluetooth-adapter?nid=-536902461.1006710&cc=ID&lc=engRemember though, particularly for U124X model needs an extra adapter sold separately to mount this kit to the meter.

author: Harvs
author_rank: Super Contributor
timestamp: March 08, 2013, 10:37:08 am
content: Great, thanks for that. Odd that they didn't put that in their literature for the meter.
audio analyzer beta test - Page 1
Forum section: electronics / testgear

author: echu
author_rank: Newbie
timestamp: September 16, 2012, 09:48:59 am
content: Is anyone in Taipei part of this beta test? Please PM me if you are.http://www.screencast.com/t/pQPY7oDNLpT

author: echu
author_rank: Newbie
timestamp: January 25, 2013, 02:29:14 pm
content: I didn't get in the beta because I was outside of US. But I have ordered and received it.http://www.quantasylum.com/content/Products/QA400.aspxMy first measurement was to compare noise of TL072 and NE5532 using fixed gain of 7. The brief summary is that I can indeed distinguish the noise between these two opamps using this instrument. Distortion measurements seem reasonable too so far.

author: grenert
author_rank: Frequent Contributor
timestamp: January 26, 2013, 04:31:11 pm
content: Why BNC connectors for something designed to measure audio?

author: echu
author_rank: Newbie
timestamp: March 08, 2013, 10:09:52 am
content: It depends mostly on wheter you measure single ended or differential audio. Consumer things is all single end. The guys on diyaudio are making differential amp for QA400.http://www.diyaudio.com/forums/equipment-tools/231401-quantasylum-qa400.htmlIf their results are good, then I will try it too.
Madell CA1640-20 question - Page 1
Forum section: electronics / testgear

author: salbando
author_rank: Contributor
timestamp: March 07, 2013, 06:48:19 pm
content: Does anyone know the maximum input voltage for the "input" bnc on the front panel of the Madell CA1640-20 function generator? I have a data sheet on it, but it fails to mention this specification.I assume this input is for using the generator as a frequency counter from an external signal.Thanks
For Consideration - > Please name a few second hand multimeters - Page 1
Forum section: electronics / testgear

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: March 06, 2013, 06:58:37 pm
content: Hi ,I keep importing stuff from us for selling here in india .Could some people name a few brands and thier models to consider in digitial multimeters .I would be really oblidged .i could buy them from like ebay and get it shipped to my us address and then import once i have a few collected monthly .

author: Matje
author_rank: Regular Contributor
timestamp: March 06, 2013, 11:58:27 pm
content: Quote from: Amarbir[Lynx-India] on March 06, 2013, 06:58:37 pmHP/Agilent 34401AKeithley 2000Sorry for stating the possibly obvious(?) or did you mean handhelds?;-)

author: EEVblog
author_rank: Unknown
timestamp: March 07, 2013, 12:09:30 am
content: Obviously any of the modern-ish Fluke models re-sell very well. If you don't know the model numbers, you shouldn't be in that businessDave.

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: March 07, 2013, 03:05:42 pm
content: QuoteHi ,Many Models like dave have reviewed and many others who have discussed in bench type are great .Due to its shear size and bulk its very heavy on the pocket to cart to india from us + indian customs .My prime targets are handheld once .I have imported agilent U1241B , AEMC Mx55 .Before this i have imported a lot of vintage VTVM and VOMS like BK precision VTVM 177 , Microntas ,Sears And few more + AVOmeters from UK .PS : i will now reply to dave's comment too

author: Amarbir[Lynx-India]
author_rank: Frequent Contributor
timestamp: March 07, 2013, 03:11:23 pm
content: Quote from: EEVblog on March 07, 2013, 12:09:30 amDave ,In do understand what you mean .But the market + the people are very different then Australia Not austriaAnd other countries like uk/usa .Most people here like to buy meter under usd 50 .Some will spend from usd 50 to usd 150 and very few after usd 150 .I would be very oblidged if some of you could help with his sear experience .What dave is saying does not apply to many indian customers .I purchased a Mx55 from AEMC that was also sold by BK precision sometimes back and also Metrix i think .No clue what the oem was .The link is here - >http://www.aemc.com/products/html/moreinfo.asp?id=40103&dbname=products.This was a beast and even when i sold it it was spot on with the voltage standard ref i had .