hybridfree/eevblog-posts huggingface dataset:
Newark Element charges shipping on email licenses - Page 1
Forum section: electronics / testgear

author: Bob S
author_rank: Contributor
timestamp: July 16, 2014, 01:17:33 am
content: I ordered an Agilent license key from Newark which arrived in the typical manner via email . Much to my surprise they sent me an invoice that included $46.00 for shipping!! Needless to say I was on the phone and received at full credit. We are a small company so we caught this but seeing and paying shipping charges on an invoice may not always get questioned. I am sure this was not an oversight by Newark just more bad business.

author: miguelvp
author_rank: Super Contributor
timestamp: July 16, 2014, 01:36:06 am
content: Their internet provider must charge them a lot for bandwidthDatabase setup mistake? it happens.

author: SNGLinks
author_rank: Regular Contributor
timestamp: July 16, 2014, 09:21:06 am
content: I ordered an Agilent license from Farnell (Element 14).I received a large padded envelope (45x32cm). Inside that was another padded envelope (35x24cm)Inside that was my License Entitlement Certificate which was an A4 sheet of paper.At least they didn't charge P&P
How oscilloscope's understand which probe is connected. - Page 1
Forum section: electronics / testgear

author: sfiber
author_rank: Regular Contributor
timestamp: July 14, 2014, 11:21:23 am
content: Hi everybody,my question is like at topic.Let me say I have an oscilloscope with 2 channels and it hasnt got a pin near of a bnc for measuring probe's impedance(1x 10x),but when pressed auto button it activates to second channel even if I didnt connect second probe to circuit that I measure.Both of probes connected to osc. but I only use first channel.How can it understand which channel is connected.

author: rob77
author_rank: Super Contributor
timestamp: July 14, 2014, 11:33:38 am
content: the scope doesn't know, it's so simpleit's you who has to know and setup accordinglyfew tips:1. always check if the probe is matching the selected probe attenuation on the scope 1x 10x ...etc...2. use color identification rings for the probes and match your trace's color with the rings (only possible for DSOs)3. if you're using only one channel - set the second channel to GND input - the auto button will not activate the second channel.

author: tszaboo
author_rank: Super Contributor
timestamp: July 14, 2014, 11:39:55 am
content: Well, I guess if it detects anything above the inherent noise level it will put it on the screen after the autoset button is pressed. I guess.

author: sfiber
author_rank: Regular Contributor
timestamp: July 14, 2014, 11:44:48 am
content: Quote from: rob77 on July 14, 2014, 11:33:38 amI have two channel that connected with probe but second channel is out of using and it dont measure anything.I mean there is no difference its connected or not.

author: rob77
author_rank: Super Contributor
timestamp: July 14, 2014, 11:46:17 am
content: Quote from: NANDBlog on July 14, 2014, 11:39:55 amyes exactly - that's why to select GND input on the unused channel. shorting the probe tip is not enough - the probe itself will still pick up enough noise to activate the channel.

author: rob77
author_rank: Super Contributor
timestamp: July 14, 2014, 11:48:59 am
content: Quote from: sfiber on July 14, 2014, 11:44:48 ameven the BNC connector is picking up noise. if you select the input GND - the scope will internally ground the channel's input and the channel will not pick up noise - therefore the auto measurement should ignore that channel.

author: sfiber
author_rank: Regular Contributor
timestamp: July 14, 2014, 12:47:15 pm
content: Quote from: rob77 on July 14, 2014, 11:48:59 amok.I can see now the reason.?ts all about noise.Thank you friend
Owon sds7102 - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: July 13, 2014, 05:43:14 pm
content: So I bought an Owon sds7102 a few months ago. I like the scope but both probes failed in a few weeks. It might have been how I was holding them while pressing the clip on/off. Anyway, the company I purchased it from refunded $40 for both probes. So I found on ebay a place where I bought eight of them for like $60 shipped.Still hating the probes, I kept checking ebay and craigs list for tektronix probes. I had 6 from a prior 300mhz analog but the tips were in sad shape. I found a guy selling a TDS744A for $550 with 5 probes. I wanted the probes thinking the scope would have issues. Boy was I wrong.This old TDS744a kicks my Owon's butt across the room. Yes, it is big, noisy, etc, heats the room, but man, what a clear display and accurate presentation. Also, it has tons of features for something this old. This one has the math features and others.Anyway, All this, 5 near new probes and the 744a for $400. Can't be beat.Comments? Anything to look for on the 744a? It passes all tests, signal path comp, etc. Clear display, no burn-in, clean case.Jerry

author: lemon
author_rank: Frequent Contributor
timestamp: July 13, 2014, 07:45:21 pm
content: Take a look athttps://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg460398/#msg460398Then, look athttps://www.eevblog.com/forum/testgear/review-of-owon-sds7102/msg465242/#msg465242and so on...
Standard resistor specs - Page 1
Forum section: electronics / testgear

author: kkayser
author_rank: Contributor
timestamp: July 13, 2014, 01:51:27 pm
content: Does anyone know the specs for Honeywell Rubicon immersed-in-oil standard resistors. (cylindrical 6" cans with 4 terminals) I particularly need to know the max power dissipation.
Equpment value  - Page 1
Forum section: electronics / testgear

author: pan0s
author_rank: Newbie
timestamp: July 10, 2014, 11:03:43 pm
content: Hello guys i got to own a wandel and goltermann spm-33 selective level meter and a ps-33 level generator.As i have no real use for them i intend to sell them.Isaw a couple of simillar models listed on ebay for thousands of dollars.Are these reallstics prices? How much are these things worth? I have to mentione that both come in a suitcase as reffered 'measuring kit', charges, probes and they are at mint condition i also managed to 'read' a signal genrated for the generator with the meter.Thanks you for your help.

author: PaulAm
author_rank: Frequent Contributor
timestamp: July 10, 2014, 11:57:32 pm
content: You have to look at the selling prices, not the listing prices.One spm-33 sold for $275. A lot of 6 in cases, certificates of calibration, etc went for $5750.Don't see any ps-33s.WG made great instrumentation, but they were sliced and diced and support is small to nonexistent. I'm not familiar with those so I can't say anything about whether or not those pieces are useful given today's state of the art.

author: free_electron
author_rank: Super Contributor
timestamp: July 11, 2014, 12:43:21 am
content: it;s worth what someone want to pay for it.if someone really really needs that particular one , and there is only one avaialble : caching.if there is tons avaialble becasue these are useless or obsolete : may as well rip em apart for parts...these are isdn testers right ? isdn is dead and buried. give it up. all these boes do is send a signal over a twisted pair and check how good the line is. so only people that pull underground cables really use these. since these days we go way further in the spectrum these machines are not suffucient for current use. ergo : no value.

author: VK5RC
author_rank: Unknown
timestamp: July 13, 2014, 12:04:04 pm
content: I just attended a ham conference (Gippstech) and some of the guys there are experimenting with low frequency radio ie 470kHz mentioned these Line level meters as good, but also mentioned softrock sdr (and they don't cost a lot) so there may be some interest but these guys won't be digging deep. FYI. Regards Rob
DS2072A i2c and spi decode issue - Page 1
Forum section: electronics / testgear

author: Neddie
author_rank: Contributor
timestamp: July 12, 2014, 08:25:55 am
content: Hi All.I'm having a problem getting the i2c and spi decoding working correctly and was wondering if I'm doing something wrong.A quick look around the forum shows people are happy with the decoding , so I'm sure I'm messing up somewhere.When I have the bus decoding on and the scope is running "realtime" it decodes correctly. I can see the datadecoding changing with the changing i2c waveform as expected. If however I try and set the scope to record thewaveforms , then the decoding stops!The waveform is recorded correctly , and I can play it back no problem , but the decoding does not work on the recorded waveform. In fact the decoding stops as soon as the record button is pressed.Any ideas?CheersNeddie

author: Neddie
author_rank: Contributor
timestamp: July 13, 2014, 07:47:40 am
content: No one?

author: iDevice
author_rank: Regular Contributor
timestamp: July 13, 2014, 08:42:59 am
content: Yes it's a well known bug unfortunately.It's kind of renders protocol decoding useless on the Rigols because using Record mode would be the solution against the lackluster performance in real time.So for the moment, the only way is to try to adjust the sampling parameters and maximize deep memory usage to acquire a very large chunk and then use zoom mode for decoding.

author: poida_pie
author_rank: Regular Contributor
timestamp: July 13, 2014, 09:04:54 am
content: As far as I can tell, the SPI, etc decode of the data displayed in record modeis now present in version 00.03.00.01.03 which you can obtain fromhereI have a DS2072 running this version of firmware and I can decode the recorded data during playback.

author: jc101
author_rank: Frequent Contributor
timestamp: July 13, 2014, 09:07:38 am
content: I have a DS2072 (non A) running version 3 of the code, and it does protocol decode on stored frames, I've been using it to debug an i2c issue recently.This posthttps://www.eevblog.com/forum/testgear/first-impressions-and-review-of-the-rigol-ds2072-ds2000-series-dso/msg158684/#msg158684details the various FW revisions, at the back end of the thread it gives details of the recording decode addition.Edit: I see podia_pie is a faster typer than me...

author: Neddie
author_rank: Contributor
timestamp: July 13, 2014, 09:41:04 am
content: Thanks guys!!Am I able to upload the new firmware into a "Hacked" scope? and if so what is the best method.

author: iDevice
author_rank: Regular Contributor
timestamp: July 13, 2014, 10:20:59 am
content: Quote from: poida_pie on July 13, 2014, 09:04:54 amAh yes, you're right, I forgot they finally corrected this bug on the ds 2000 latest firmware.Unfortunately, they didn't yet on the ds4000, so I'm still stuck.
Anyone Seen This? Is this a Bogus Mini Circuits Part? - Page 1
Forum section: electronics / testgear

author: TheRuler8510
author_rank: Regular Contributor
timestamp: July 13, 2014, 04:13:48 am
content: Anyone seen this Mini Circuits Power Divider?I cannot find a datasheet or reference to it anywhere. I suspect it is a completely (China) fake made-up part number.I have the misfortune of buying two of them for $15 and have found the they is no resistance between the ports at all, i.e. not 50 ohms. So they are nothing more than a coax tee! They're being sold on ePray for $5-$30.http://www.ebay.com/itm/Mini-Circuits-POWER-DIVIDER-ZATT-2-1A-KS21604-L1-LOT-OF-2-EA-/321115204314?pt=LH_DefaultDomain_0&hash=item4ac3f52ada

author: hendorog
author_rank: Super Contributor
timestamp: July 13, 2014, 04:43:22 am
content: Google found this pagehttp://rebes.blog.163.com/blog/static/207535166201242944044387/with a (tiny) bit of info:Mini Circuits Power Divider Mini Circuits ZATT 2 1A NEW700mhz -1ghz and 1.7ghz-2.0ghzSo the DC resistance may not mean much if its designed for 1GHz.i.e. Perhaps its one of these inside which would look like a short at DC:http://www.microwaves101.com/encyclopedia/Wilkinson_splitters.cfm

author: TheRuler8510
author_rank: Regular Contributor
timestamp: July 13, 2014, 05:03:22 am
content: hendorog,Yes, you are right--my error. I pried off the cover and inside I found a Wilkinson divider.I jumped to conclusions after not being able to find a reference.Thanks!
Rigol DS1000Z hack - Page 1
Forum section: electronics / testgear

author: echen1024
author_rank: Super Contributor
timestamp: November 02, 2013, 02:59:24 am
content: Well, after binning the idea of purchasing a dedicated Logic Ananlyzer, I decided to just sell my Siglent and purchase a Rigol DG1074Z. The question is, can this scope be hacked for Serial decode/triggering and the 24 mpts memory?

author: apelly
author_rank: Unknown
timestamp: November 02, 2013, 03:07:16 am
content: Lookhereandhere

author: Mark_O
author_rank: Frequent Contributor
timestamp: November 02, 2013, 03:13:40 am
content: QuoteYes, as even the most basic searching here will quickly reveal.

author: echen1024
author_rank: Super Contributor
timestamp: November 02, 2013, 03:26:19 am
content: Oops. My own laziness has failed me again.

author: iloveelectronics
author_rank: Frequent Contributor
timestamp: November 02, 2013, 04:26:41 am
content: There still doesn't seem to be a bandwidth hack, yet, though.

author: nixfu
author_rank: Unknown
timestamp: July 14, 2014, 12:37:55 am
content: Quote from: iloveelectronics on November 02, 2013, 04:26:41 amHow so, you can change the 70mhz to 100mhz?ALSO, Does anyone know if you can change the boot logo of the 1000z series?

author: echen1024
author_rank: Super Contributor
timestamp: July 14, 2014, 01:55:01 am
content: Quote from: nixfu on July 14, 2014, 12:37:55 amJust go on the Keygen page. Look for 100MHz, and select that.
WP34S PROGRAMMING CABLE (LOOKING FOR) - Page 1
Forum section: electronics / testgear

author: 3e0_rtn
author_rank: Newbie
timestamp: July 12, 2014, 09:44:36 am
content: Looking for a programming cable in order to transform several HP-30Bs into WP34S.Want to buy or to lend.Thanks. Regards.Emmanuelhttp://www.emmanuel.hp41.eu/
Old Gould device... but what does it do? - Page 1
Forum section: electronics / testgear

author: Maxlor
author_rank: Frequent Contributor
timestamp: July 16, 2014, 10:09:26 pm
content: I found this old Gould device on a local auction site (see image below). It's said to be an oscilloscope, but is it really? The numeric keypad is unusual for an oscilloscope. Maybe a logic or spectrum analyzer? But As far as I can tell from 2 hours of googling, Gould didn't make those. Or an oscilloscope/signal generator combo? Not seeing anything similar on google images though. I'm puzzled. Any ideas?The left half of the device has the same layout as theGould OS4040, whereas the silkscreen design looks more like theGould Type 4035.

author: N2IXK
author_rank: Frequent Contributor
timestamp: July 17, 2014, 12:06:15 am
content: Model number? How about posting a photo with enough resolution to be able to read the front panel markings?

author: dfmischler
author_rank: Frequent Contributor
timestamp: July 17, 2014, 12:57:06 am
content: I can't read the labels either, but it gives the impression of an oscilloscope with a word recognizer for triggering (maybe even mixed signals display).

author: baljemmett
author_rank: Unknown
timestamp: July 17, 2014, 01:57:39 am
content: Squinting at the model number in that photo a bit, it kinda looks like it has a 1 in the second digit; and the text before it vaguely suggests 'intelligent oscilloscope' from the shape of the fuzz… So given that, Google suggests the OS5100 - as mentioned and shown in the advert at the bottom of each page ofthis article about a different range.Actually, digging a bit deeper findsthese photos of the OS5110which are even better - they have the blue stripe that the adverts are missing, for a start.Hopefully variations on those model numbers will turn up more details - sorry I didn't squint at it for longer when you pasted the link in the IRC channel earlier!

author: Maxlor
author_rank: Frequent Contributor
timestamp: July 17, 2014, 07:59:14 am
content: Well, a better image would make it rather easy, where's the challenge in that! Seriously though, that's unfortunately the best image I have, hence my difficulty in figuring it out.Baljem's spot on though, thanks!
Black Star Apollo Frequency Counter - Page 1
Forum section: electronics / testgear

author: NowandZen
author_rank: Contributor
timestamp: July 15, 2014, 02:08:52 pm
content: I've just picked up an ebay bargain Black Star Apollo 100 frequency counter, in very nice condition but one of the two inputs isn't working.I've scoured the usual places but cannot find schematic / service manual for this model.Does anyone have a copy of the service manual for this model or able to point me in the right direction?Thanks!

author: alanb
author_rank: Frequent Contributor
timestamp: July 15, 2014, 03:23:14 pm
content: I was also trying to get one, all I managed to get was the user manual which I have attached.

author: NowandZen
author_rank: Contributor
timestamp: July 15, 2014, 06:41:10 pm
content: Thanks for the reply, I've already got the user manual too.Really useful counter, just cant get any response from Input B.
Reading from Keithley 2015 via serial RS232 - Page 1
Forum section: electronics / testgear

author: ivaylo
author_rank: Frequent Contributor
timestamp: July 11, 2014, 06:20:59 am
content: The beast clearly listens but does not respond. I am using an USB to serial converter (tried two of them, a good FTDI based and another one which I know also works), my serial settings are like the book says (9600, bytesize=8, parity=none, stopbits=1). The instrument has RS232 enabled and all matching settings. Same results under Ubuntu (Python and some terminal program) and Win7 (Putty).This is how I know it listens:- every time I send "func 'volt:dc';:read?" and the instrument triggers and freezes the display with the given voltage ('REM' lights up on the display)- "*RST" consistently resets it (clears the screen with "-------")No command returns anything back though, tried "func 'volt:dc';:read?", "*IDN?", etc.I am either missing something obvious or the instrument is broken or something. Decided to ask before I start listening to cables and such. Appreciate your help...

author: AndyC_772
author_rank: Super Contributor
timestamp: July 11, 2014, 06:28:38 am
content: I had much the same with my 2000 meter. Turned out the RS232 level shifter IC in the unit was dead, so although the meter could receive serial OK, responses never made it out of the port.Check the voltage levels on the serial port with the PC cable plugged in, and make sure the meter can drive the PC's RXD line to valid levels.

author: ivaylo
author_rank: Frequent Contributor
timestamp: July 11, 2014, 08:42:16 pm
content: GPIB works fine, decided to postpone the Serial investigation...
Best place to buy a DSO from in Canada? - Page 1
Forum section: electronics / testgear

author: polishdude20
author_rank: Contributor
timestamp: July 07, 2014, 03:13:51 am
content: I live in the Vancouver area and I'm looking to buy a DSO such as a Rigol DS1052E and so far, I only see online USA retailers as the cheapest option but even then the shipping costs are a bit high.Any advice?

author: johnny_canuck
author_rank: Contributor
timestamp: July 07, 2014, 11:33:07 pm
content: ACA TMetrix Inc. - A subsidiary of Allan Crawford Associates Ltd.Tyrene Shagol | Inside Technical Sales5805 Kennedy Rd, Mississauga, ON L4Z 2G3, CanadaDirect: 905.502.2074 |www.tmetrix.com| tyrenes@aca.ca

author: idpromnut
author_rank: Unknown
timestamp: July 07, 2014, 11:35:32 pm
content: I bought my DS2072A from ATA Tmetrix, I don't know where you are, but if you're in Montreal QC, I can give you the name of the sales rep I dealt with here; very happy their service.

author: pickle9000
author_rank: Super Contributor
timestamp: July 08, 2014, 12:08:38 am
content: Hantek for North America is run from Canada. Here is the ebay store.http://stores.ebay.ca/TechRecommends/Test-Measurement-Instruments-/_i.html?rt=nc&_fsub=1719980015&_sid=246986895&_trksid=p4634.c0.m14.l1513&_pgn=2I can't speak to the quality or anything else (on the scopes) but they seem to be the cheapest if purchased in Canada. I have purchased other gear and the build quality is fair to good. The service was excellent as was the shipping time 2-4 days from order time on ebay.

author: pyromaniac4382
author_rank: Contributor
timestamp: July 11, 2014, 04:07:41 pm
content: Not sure if this helps your decision, but I originally went to buy a Rigol DS1052E fromwww.tequipment.net/, and after I bought it they upgraded me to a DS1102E for free because they simply don't have anymore. This was a little less than a year ago, so if it comes down to that its free shipping, and you could end up with an 1102E like me. either way you could just MOD it, and it is a reasonable price.Edit: Sorry didn't see CanadaTake a trip down?
tek ths710a scope - Page 1
Forum section: electronics / testgear

author: deth502
author_rank: Frequent Contributor
timestamp: July 11, 2014, 07:32:58 pm
content: i have a chance to get one of these for $450. i dont really NEEEEED it, but seems like a good deal compared to what ive seen them going for. has 2 batteries, he says they may or may not hold a charge. ac adapter, car adapter, various probes and cables (including the cable to connect it to a computer) does its own data logging, which could be nice?........worth it, or pass it up?
CombiScope PM3384 - Page 1
Forum section: electronics / testgear

author: david69
author_rank: Regular Contributor
timestamp: June 14, 2014, 12:40:35 pm
content: Hi, I would like to repair this fault on PM3384 scope,when I switch them in digital mode, chanel 1 and 3 are out of range, beam is outside display, where I should look into? Thanks for any idea, David

author: HighVoltage
author_rank: Super Contributor
timestamp: June 14, 2014, 04:33:44 pm
content: This is a typical problem on the Philips / FLUKE PM33xx Series of these scopes including the "A" and the "B" versions.I have several of the PM3394B with all options and this problem even happened to those high end scopes.On your 4 Channel version, it either happens to Channel 1+3 or 2+4 or all off them.There are two hybrid chips responsible for this problem, one of them is for Channel 1-3 and the other for Channel 2-4They are a pain to exchange, because they are soldered on to the PCBThe Problem is, that nobody has these hybrid chips anymore.I have the full schematics and service manuals for these scopes, if you need them.

author: david69
author_rank: Regular Contributor
timestamp: June 14, 2014, 05:36:17 pm
content: I see two hybrids on main processor board. I have openedsignal board with amplifiers, but now I don`t have focused track and text :-( I think that is not easy to soldered this hybrids :-( The focus pot beeps without anychanges on screen... The nice evening David

author: david69
author_rank: Regular Contributor
timestamp: July 07, 2014, 09:02:05 am
content: Hybrids are OK, I changed them in position. Calibration forchanel 1-3 writes "calibration error 102" which I don`t knowHow continue??

author: david69
author_rank: Regular Contributor
timestamp: July 08, 2014, 08:14:52 am
content: hybrid has in bad position pin1 -2,5VDC, pin2 0V, pin3 -2,5VDC, and in good positon has pin1 -0,5VDC pin2 -0,5VDC and pin3 -0,5VDC ... I change hybrids in positionand it has same parametersThe sources 4,5V -6,5V, 17,5V are in both positions...

author: david69
author_rank: Regular Contributor
timestamp: July 10, 2014, 01:05:43 pm
content: first I will change BF579 in oscillator, and look at clock signals again...

author: david69
author_rank: Regular Contributor
timestamp: July 11, 2014, 12:41:05 pm
content: the part of MASPU-A which sources buffer with clock,is broken :-( PIN61 ClockA is destroyed ...It needs replace older IC OQ0233WP ....
Calibration done to 1-year standard - is this standard practice? - Page 1
Forum section: electronics / testgear

author: JuiceKing
author_rank: Regular Contributor
timestamp: July 04, 2014, 02:07:22 am
content: Hi,I sent in a DMM for calibration and got it back with a report that indicated that nothing was done; it was in tolerance as received for every range of every function.Great--that means it's correct and stable. But when I look closely at the report, I can see that tolerance was determined by the instrument's 1-year accuracy rating, which is the least demanding standard. It's not in tolerance for the 1-day standard.Is this normal practice or should I call the cal lab and complain?Thanks,- Ken

author: theatrus
author_rank: Frequent Contributor
timestamp: July 04, 2014, 02:24:07 am
content: It depends on what you paid for, in a way. Its common for calibration to be done at a one year cycle, so one year specs are looked at.For instance, I recently had a 3458A recalibrated. I had not been calibrated (at least by Agilent) for 10 years. It was in spec when it was received, though it was re-calibrated.

author: saturation
author_rank: Super Contributor
timestamp: July 11, 2014, 11:54:06 am
content: A properly calibrated device should be in factory spec and that means all specs in the manual: 24hrs, 90 days, 6 mo, 1, 2 year etc.If your 24 hours is off, IMHO it was not done correctly.Calibration however only means 'measurement', not adjustment. Some labs will just measure items and return the device to you; but it should highlight what is in and out of spec on the report. Its then up to you to decide if you want it adjusted, but IIRC good labs inform you or its specified in the contract for an option to be notified that adjustment is required or it would automatically go into adjustment, as it means an extra charge.Quote from: JuiceKing on July 04, 2014, 02:07:22 am
Really cheap chinese signal generators from Ebay - Page 1
Forum section: electronics / testgear

author: jay
author_rank: Regular Contributor
timestamp: July 10, 2014, 06:39:40 pm
content: There are many listings of very cheap 10MHz signal generators on Ebay:http://www.ebay.com/itm/10MHz-DDS-Function-Signal-Generator-Carrier-Debugging-Source-Frequency-Counter/281310662043http://www.ebay.com/itm/10MHz-DDS-function-signal-generator-frequency-meter-square-wave-pulse-test-/221413594910Any experiences or knowledge of those? Do they roughly work as advertised? If those get anywhere close to the advertised features and accuracy it's good enough for my current purposes. So far I've been using a simple adjustable 555 timer circuit for testing my projectsp.s. I know that you can get old Tektronix or other reputable brand sig gens for the same price. It's extremely rare to see any local listings and the shipping cost from the USA is usually insane.. It would be almost cheaper to get a flight ticket for it.

author: polishdude20
author_rank: Contributor
timestamp: July 10, 2014, 07:31:26 pm
content: Check out these ones if you want super cheap. They still look more sophisticated than a 555 timer circuit!http://www.ebay.com/itm/Digital-DDS-Function-Signal-Generator-Module-Sine-Square-Sawtooth-Triangle-Wave-/191133304605?pt=LH_DefaultDomain_0&hash=item2c806ec71dhttp://www.ebay.com/itm/DIY-KIT-Latest-DDS-Function-Signal-Generator-Sine-Square-Sawtooth-Triangle-Wave/111335308292?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D23491%26meid%3D8222467901747337503%26pid%3D100005%26prg%3D10073%26rk%3D3%26rkt%3D6%26sd%3D191133304605&rt=ncCheck youtube for reviews

author: aroby
author_rank: Regular Contributor
timestamp: July 10, 2014, 08:04:49 pm
content: I have one and it seems to work just fine. You have to adjust the settings, then start the generator. You can't change the settings without stopping it, which is a pain but fine for occasional use.Anthony
BEM 002 Electronic Voltmeter Kit - manual or any info? - Page 1
Forum section: electronics / testgear

author: CHexclaim
author_rank: Regular Contributor
timestamp: July 09, 2014, 05:10:19 pm
content: I have an (apparently obscure) Analog Electronic Voltmeter dated around mid 60's or early 70's. It is branded as BEM 002 Electronic Voltmeter and I've found very little information on the web (if not any).It was given to me by a now sk ham. It came as a Kit but I received it already assembled. It has a I.R.U. member logo stamped on the front panel.It has a couple of tubes inside. It mostly works and seems quite accurate and in good shape, but some functions need to be adjusted. I would like to make it operational. I am attaching a photo.If anybody has any information of it, schematic, manual, specs, I would really appreciate it.Thank you, Charlie.

author: elliott
author_rank: Regular Contributor
timestamp: July 09, 2014, 05:43:23 pm
content: Looks like a decent little meter, being a VTVM the input impedance is constant unlike a standard VOM.

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 09, 2014, 06:00:11 pm
content: Interesting. Made by MBLE in Brussels (capital of Belguim), which were a part of Philips Belgium. They also had a lot of other kits:http://users.skynet.be/fc664814/meterkits.htmlA leaflet (sorry, in Dutch):http://sharon.esrac.ele.tue.nl/~pa0ib/bouwdozn/meetapp/brmeet/pdf/meetappti2.pdf

author: Andy Watson
author_rank: Super Contributor
timestamp: July 09, 2014, 06:16:49 pm
content: Very cute for a VTVM. Try this:http://188.142.38.174/nvhr/MBLE_BEM002.pdf

author: CHexclaim
author_rank: Regular Contributor
timestamp: July 09, 2014, 06:42:22 pm
content: Paul an Andy,Thank you very much for the information! I really appreciate it. I am looking to the french version of the manual which at least I can follow.But listen to this! In the brochures Paul posted, I can see the audio oscillator (BEM 004) and the oscilloscope (BEM 016). My dad, also a ham, has BOTH of them. In fact, he still uses the oscillator and I still, but rarely, use the scope! But I never realized that they all have the same origin. I know that my dad doesn't have the VOM, so the info provided is very important, but I will tell him the story and for sure bookmark these pages.By what I can see the VOM has some interesting specs. I'll try to make it fully operational and use it when required.BTW, how do you find these things online?Thanks aganin, Charlie.
DMM Autoranging Scale - Page 1
Forum section: electronics / testgear

author: acceler8
author_rank: Newbie
timestamp: July 09, 2014, 04:33:40 pm
content: I have a Tenma 72-7730 (looks like a Uni-T UT71B clone.) It has always been a little funky with the Autorange in Ohms mode. For example, measuring a 100 ohm resistor that is 101.7 ohms will read as .1017 K ohms. It is the same for the Meg-ohm scale (101.7 K ohm will read 0.1017 M ohm). In fact, the only time it chooses the right scale is if the resistor is under 100 Ohms.Is there anything I can do to fix this? Is this a common problem? I tried searching, but I couldn't seem to come up with the magic combination of terms to find this problem.

author: Wytnucls
author_rank: Super Contributor
timestamp: July 09, 2014, 05:14:42 pm
content: The UT71B behaves normally, only changing scales when the resistance is higher than the 20,000 count.For instance a 150 Ohm resistor will read as 149.47 Ohm and a 220 Ohm resistor as 0.2172k Ohm.
Help choosing the right Arbitrary Waveform Generator : old or new instrument ? - Page 1
Forum section: electronics / testgear

author: psykok
author_rank: Frequent Contributor
timestamp: July 09, 2014, 08:49:48 am
content: Hi,Currently I have a WAVETEK FG3B function generator which is not bad but it's a little bit too noisy for my Audio usage (specially for the square wave)I need atleast:- frequency range until 20 MHz- good Frequence Accuracy (<0.5% )- output range until 5vpp- low distortion sin wave- small overshot for square waveMy budget is arround 250€ (very max 300)As new instrument I found two nice generators by Rogol and Siglen- Siglent SDG1000- Rigol DG1022For Old instrument :- HP 3325B- HP 8165AI know that all instrument I have listed above are more or less fitting my needs but what will be your advice ? better a new or an old instrument? do you have maybe other good suggestions?Thanks for your help.Regards,Alex

author: jpb
author_rank: Super Contributor
timestamp: July 09, 2014, 09:50:50 am
content: Your requirements are a little vague.For example, you say you want low distortion sine waves but don't say how low. If you're doing audio work you may find the distortion levels of general function generators a bit high and it might be worth considering a separate source for the audio side. For example I nearly bought an Krohn Hite ultra low distortion oscillator off e-bay that the seller was having trouble shifting at £60 but didn't in the end because of the bulk (I don't have much space).

author: psykok
author_rank: Frequent Contributor
timestamp: July 09, 2014, 11:11:43 am
content: Hi,I said low distortion because my current Generator has a noisy output.I don't think a need an ULTRA low noise sine generator, I have one in my Audio Analyzer (hp 8903).Alex

author: Bored@Work
author_rank: Super Contributor
timestamp: July 09, 2014, 03:52:19 pm
content: The combination of low distortion sine wave and cheap) ARB might not be what you want. ARBs typically work with DDS or other techniques where a waveform is assembled piecewise from digital data. These techniques create all sorts of imperfections.Hint: Quantify (with numbers) what you want, not qualify with words (like "low" or "ultra low").
Power supply series connection: possible fault - Page 1
Forum section: electronics / testgear

author: jmt
author_rank: Newbie
timestamp: July 09, 2014, 12:53:28 am
content: I recently picked up a HP E3617A from ebay. I went to connect it in series with my HP E3615A, since they are both floating power supplies, and I noticed an arch when I attempted to connect the wire between them (E3617A (-) to E3615A (+)). Both power supplies had their voltage and current limits on the absolute lowest setting. I turned them both off and measured 36V between each of the E3617A terminals and ground. I shorted this out with a resistor until it read under 1V. Then I connected the two power supplies as before except they were both off. When I turned them on I tripped the circuit breaker. Something is certainly wrong here.I unplugged both power supplies and measured the following:Steadily increasing resistance between either terminal and ground on the E3617A. A capacative short?After shorting the terminals, a steadily increasing voltage between either terminal and ground on the E3617A. After 1 minute it is at 17mV.For comparison, the E3615A shows an open circuit between ground and the terminals (as expected), but also shows the steadily increasing voltage.Did I connect them incorrectly? What else should I test to help find the fault? I'm relatively new to power supplies so any help would be greatly appreciated.Update:As soon as I turn the E3617A on, the 36V between the terminals and ground appears. If I crank the voltage to the max (60V) then I read 90V! With the E3615A, about 300mV is measured.

author: Rerouter
author_rank: Super Contributor
timestamp: July 09, 2014, 07:26:29 am
content: As i do not own the supplies, i will point out some tests you can start with,1. measure the resistance between the negative terminal and the ground terminal with the supply off, (leave it off for a few minutes to dissipate any voltage difference) if the value is high, then the supply is floating, if it is low, it may have a switch to select a hard ground link or a strap on a rear set of terminals etc,2. Turn it on, add a resistance (e.g. 47K) between positive and ground, if the negative terminal shifts below ground (-V) and the positive equals ground it is floating, if the negative stays matched the ground then there may be a setting
Save the Old Oscilloscope!! (div switch malfunction) - Page 1
Forum section: electronics / testgear

author: Patent.STM
author_rank: Newbie
timestamp: July 07, 2014, 04:58:47 pm
content: Dear all,I have an old oscilloscope with a bad div knob, the symptom is the input signal gone when the knob is set to .1 or 2 div.the div knob looks like the attachment (referenced image from from google cache). confirmed some damaged contacts, not a cleaning problem.the old scope is working great but the knobs become a real problem.is it possible to order a new switch?is it possible to build up a relay-array and replace the old switch?I like this old scope very much, it's been very precise even 15 years after production.Please let me know if anyone has an idea of saving this oscilloscope.(Picture updated, it's the most similar one on google cache but the korea page is no longer available)

author: robrenz
author_rank: Super Contributor
timestamp: July 07, 2014, 05:20:51 pm
content: We need some close up clear pics of the real thing to be able to help. Especially the possibly bad contacts themselves. I would think that some careful reforming of the switch contacts to re-establish contact pressure and some Deoxit would at least give some signal thru.

author: DmitryL
author_rank: Regular Contributor
timestamp: July 07, 2014, 06:18:06 pm
content: .. once upon a time I decided to clean similar noisy wafer switches on my old Hitachi scope with a contact cleaner spray... The board was covered with a thick layer of rosin flux, and the spray dissolved the rosin and sneaked into the wafers by capillary effect. I had to desolder these switchesand wash them in IPA in the ultrasound bath..So, be careful

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: July 08, 2014, 03:21:46 am
content: Check the solder joints under each wafer.

author: Patent.STM
author_rank: Newbie
timestamp: July 08, 2014, 04:22:02 am
content: hi everyone,I have tried to find out the most similar switch.It is pretty confirmed that the switch has some missing parts, therefore the switch itself is un-repairable.please let me know if there is someway to order a new one, or there is any relay-like switches suitalbe for such usage. thank you so much!!

author: elliott
author_rank: Regular Contributor
timestamp: July 08, 2014, 04:26:05 am
content: Quote from: DmitryL on July 07, 2014, 06:18:06 pmHitachis are apparently bad about that, my V-1150 is still pretty dicky after hosing them with 2 cans of cleaner. I think I might have to go for the ultrasonic bath, but I do not look forward to trying to remove them.

author: Patent.STM
author_rank: Newbie
timestamp: July 08, 2014, 08:38:55 am
content: i were told that rosin is a thin protection on solder points, if you remove them, the solder would degrade faster than normal.
MOVED: Siglent 150 MHz DSO - Limited Stock at Bargain Price - with Bonus DMM Leads  - Page 1
Forum section: electronics / testgear

author: GeoffS
author_rank: Unknown
timestamp: July 10, 2014, 01:34:51 am
content: This topic has been moved toBuy/Sell/Wanted.https://www.eevblog.com/forum/index.php?topic=33586.0
Rigol Dg1000z and SiFi - Page 1
Forum section: electronics / testgear

author: Freighternut
author_rank: Regular Contributor
timestamp: July 06, 2014, 12:35:15 am
content: I would be interested to know if SiFi has overcome some the pulse limitations that the DG4000 series has I.E. excessive rise times on short pulses in a long pulse period as per this post:https://www.eevblog.com/forum/testgear/rigol-dg4000-arb-gen-as-pulse-generator/msg140689/#msg140689From pulse specs in the datasheet the spec for rise time suggest that it may still have issues:Rising/Falling Edge ?10 ns (limited by the current frequency setting and pulse width setting)Can anybody comment on this?

author: cyr
author_rank: Frequent Contributor
timestamp: July 06, 2014, 07:39:09 am
content: Below is the rising edge of a 10 us pulse, configured with 10ns rise time, at 1kHz and at 1Hz. Looks OK.The third one however is at 100mHz, at the "fastest" setting allowed (90ns rise, 100 us width)). Not exactly "high fidelity"....DG1032zAnd the settings follow that pattern going to longer periods. At 1uHz, the shortest pulse is 10s and the rise time is 9 ms.

author: Freighternut
author_rank: Regular Contributor
timestamp: July 06, 2014, 09:03:20 am
content: Thanks CYR!Excellent information and it looks like the dg1000z would work for me. My requirement is for simulating relatively low frequency (narrow pulse, long period) inputs to microcontrollers. I don't think that I have a need to go out 1uHZ if I do I will certainly need to add a schmitt trigger between the ARB and the micro input.I have another question; can the two outputs be synchronized and phase adjusted. My requirement here is to simulate quadrature inputs.Many thanks again for your excellent reply.

author: cyr
author_rank: Frequent Contributor
timestamp: July 06, 2014, 09:26:48 am
content: You can adjust the phase for each channel and align them with a button press, and for most waveforms you can set the channels up to track in frequency (not in pulse mode for some reason, but square should work for quadrature).

author: rodpp
author_rank: Frequent Contributor
timestamp: July 07, 2014, 03:29:27 am
content: Does anyone knows where can I find technical details about the Rigol SiFi technology?
Siglent SDS1052DL  VS   Rigol DS1052E - Page 1
Forum section: electronics / testgear

author: polishdude20
author_rank: Contributor
timestamp: July 06, 2014, 06:38:22 am
content: I've found both of these oscilloscopes being sold by Tequipment and I was wondering which one is better for a beginner? I'm currently looking for a cheap analog oscilloscope but if that search doesn't prove fruitful, I'll be aiming for a new digital one.Here are the respective links:Sigilent:http://www.tequipment.net/Siglent/SDS1052DL/Digital-Oscilloscopes/Rigol:http://www.tequipment.net/RigolDS1052E.htmlThe Sigilent is a bit cheaper but the Rigol may be more reliable? Any opinions on these two?

author: tautech
author_rank: Super Contributor
timestamp: July 06, 2014, 07:35:57 am
content: I can offer some advice on the Siglent SDS1052DL.Looking at my data and pricing, I feel the SDS1072CNL, while being slightly more expensive, is a much better buy.The SDS1072 has 70 MHz bandwidth, twice the sampling rate at 1 GSs/s and sightly more memory.Additionally as it seems everyone is into hacking, the CNL version can have the additional memory installed to upgrade it to CML specs(2M).There is a thread on EEVblog describing this upgrade and the memory chip part number.I could not recommend this until the warranty has expired.Reliability.I have supplied a few dozen Siglent's to the NZ market and have never had any failures.

author: polishdude20
author_rank: Contributor
timestamp: July 06, 2014, 08:20:37 pm
content: Is it still a better buy than the rigol?

author: Hydrawerk
author_rank: Super Contributor
timestamp: July 06, 2014, 11:07:26 pm
content: Siglent SDS1052DL has a better front panel.
Brymen bm257 vs Amprobe am-270 - Page 1
Forum section: electronics / testgear

author: FairDinkum
author_rank: Newbie
timestamp: July 05, 2014, 11:48:45 pm
content: Hi there I'm a hobbyist about to start building a headphone amp (bottlehead crack + speedball). I'm looking to buy a DMM and through my search I've seen the Brymen and Amprobe mentioned often.The Brymen bm257 is only rated to 8A, while the Amprobe has a bad backlight. I wont be working in the dark though. In terms of performance and my needs, which DMM should I go for?

author: theatrus
author_rank: Frequent Contributor
timestamp: July 06, 2014, 12:56:10 am
content: Either one should meet your needs for basic measurements. I wouldn't overspend and save any residual cash for an oscilloscope, which will be invaluable.

author: torr032
author_rank: Regular Contributor
timestamp: July 06, 2014, 12:59:52 am
content: For the electronic use uni-t ut61e price/performance ratio is still unbeatable. No other DMM comes even close.

author: FairDinkum
author_rank: Newbie
timestamp: July 06, 2014, 04:54:08 am
content: Thanks guys! Just to be sure - a 8A rating (on the Brymen) is okay for a hobbyist? I'll be running and testing the amp with 230v running through the circuit. EDIT: Brymen spec says it can take 15A for 30 secs.Will check out the Uni-T UT61E. And now I also see that Franky is offering the Uni-T UT139c in his shop. He also has the Digitek true RMS DMM at an even cheaper price. So many choice. But safety for me a very important also as I'm a beginner.

author: Lightages
author_rank: Unknown
timestamp: July 06, 2014, 05:31:34 am
content: I would agree that the UT61E is a big bang for the price. It has high count, good accuracy although it can drift quite a bit, and includes a PC connection kit. It does not have a back light, no temperature measurement, and if you get the international model version the input protection is a bit of a joke. The German "GS" version is rated correctly. It is a good bench and electronics meter but keep it away from high energy circuits.Between the BM257 and the Amprobe AM270, I would pick whichever you like better.
Fluke 8810A info needed - Page 1
Forum section: electronics / testgear

author: BillWojo
author_rank: Regular Contributor
timestamp: July 05, 2014, 03:27:08 am
content: Digging through my old junk I found an old Fluke 8810A meter. I think it has problems as it seems to want to flash 18.88888 on some of the settings. I have some old test leads I need to dig up but does anybody have a manual for this thing?ThanksBillWojo

author: xwarp
author_rank: Frequent Contributor
timestamp: July 05, 2014, 03:37:29 am
content: I'd say there were problems if your 5.5 digit meter displayed 7 digits....http://www.ko4bb.com/Manuals/Fluke/Fluke_8810A_Digital_Multimeter_Instructrion_Manual.pdf

author: BillWojo
author_rank: Regular Contributor
timestamp: July 05, 2014, 04:00:16 am
content: Actually I just went and plugged it back in. Reads +188.888 and flashing. That can change depending on what mode it's in. I figured that if it's flashing it's not happy. But what do I know?BillWojo

author: gizmoco
author_rank: Newbie
timestamp: July 05, 2014, 06:36:28 pm
content: You're probably selecting a function that's not available on your meter.Resistance and AC functions were optional. Read Section 6 of the Manual.
HP 34401a Self Test Fail - Page 1
Forum section: electronics / testgear

author: lkmurdoch
author_rank: Newbie
timestamp: July 10, 2014, 04:08:03 pm
content: Hi everyone,My first post so here goes.....I have a HP 34401a that fails self test. It does measure AC volts, DC volts reasonably accurately (very close to a Fluke 45) but Ohms is way off cal.The Ohms function measure 00.000 when the leads are shorted, but nothing else. I have checked for signs of obvious damage internally and checked thepower supply voltages which are fine. Any suggestions gentlemen?Thanks in advance,Mike
Roll Mode on Rigol DS1074z / DS1104z - Page 1
Forum section: electronics / testgear

author: don
author_rank: Regular Contributor
timestamp: July 03, 2014, 03:19:58 pm
content: Does anyone here own one of these scope and know if zoom works in roll mode? I'd like to be able to acquire at about 1s/div and stop. Then zoom in from there. So 4Ch at 3Mpts per channel should let me zoom in to better than 10us/pt . Also wondering if anyone knows max sample rate in roll mode?Thanks for help!Don

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: July 03, 2014, 05:35:23 pm
content: Quote from: don on July 03, 2014, 03:19:58 pm1 channels on, sample rate is 2 MSa/s, can zoom up to 5µs/div2 channels on, sample rate is 1 MSa/s, can zoom up to 5µs/div3 channels on, sample rate is 500 KSa/s, can zoom up to 5µs/div4 channels on, sample rate is 500 KSa/s, can zoom up to 5µs/div

author: don
author_rank: Regular Contributor
timestamp: July 04, 2014, 02:07:02 am
content: Great, thanks for info. I think I'll need to pick one of these up. Does it always display dots at max zoom or can you configure for vectors / lines?

author: GeorgeOfTheJungle
author_rank: Super Contributor
timestamp: July 04, 2014, 06:52:45 am
content: Quote from: don on July 04, 2014, 02:07:02 amI put it in dots mode, I wanted to see the actual data points. In vector mode you don't know which point is a guess and which one is real sampled data.