hybridfree/eevblog-posts huggingface dataset:
Looking for manuals for the Leader LS1040 Oscilloscope - Page 1
Forum section: electronics / testgear

author: vigsgb
author_rank: Contributor
timestamp: March 03, 2014, 02:42:55 am
content: I have searched the internet for a manual for the leader ls1040 oscilloscope amd can't find one anywhere. I am thinking I might just not know where to look. Does anyone have a link or know where I could get one?

author: Jarvik7
author_rank: Contributor
timestamp: July 28, 2014, 04:35:56 am
content: I emailed Leader for a copy of the 1060 instruction manual and service manual, and they replied with a PDF scan the next day.

author: tautech
author_rank: Super Contributor
timestamp: July 28, 2014, 05:47:04 am
content: @ Jarvik7Upload the manual to one of the free download sites in first thread in the Repair board.Then others can find it.

author: NDani
author_rank: Contributor
timestamp: January 17, 2015, 06:52:59 pm
content: Dear Forum Members,I asked Leader for the 1040's Users' Manual, but they only sent me the Service Manual. Does anyone happen to have the Users' Manual in any form?

author: PA0PBZ
author_rank: Super Contributor
timestamp: January 17, 2015, 07:06:49 pm
content: Not sure about the difference but if it is only the bandwidth here's the LS1020 manual:http://www.ece.rice.edu/~jdw/data_sheets/ls1020.pdf

author: NDani
author_rank: Contributor
timestamp: January 20, 2015, 10:41:49 am
content: Thanks a lot! There's more difference than the bandwith but this is still going to be very helpful!
IT400-4 Medical Isolation Transformer mod - Page 1
Forum section: electronics / testgear

author: nyo
author_rank: Contributor
timestamp: January 18, 2015, 01:18:40 am
content: Hi,I have posted a video to YouTube -http://youtu.be/QOpBGMn5ECAand posted documentation on my sitefelipes.net.It's about modifying a medical isolation transformer...I would love some feedback, you can post it here, my site or the youtube video, you can even email it to me, my email is at my site.Thanks,Hope it's useful to someone out there.
Rigol DS2072A Not Powering Up - Page 1
Forum section: electronics / testgear

author: Andrei
author_rank: Contributor
timestamp: January 17, 2015, 06:00:26 am
content: Hi,About 6 months back I got a Rigol DS2072A and immediately hacked it. It worked with no issues for a few months, after which I did not have time to use it much.Today, I go to power up the scope (the green LED on the power button is pulsing on/off) but the scope would not turn on. Before I take the screwdriver to it to start debugging, I was wondering if anyone had a similar experience with their scope.I can't imagine anything past the power button is broken, maybe the soft switch is not making good contact, as the power supply seems to be lighting up the LED.Regards,Andrei
Agilent InfiniiMax coax connector : stock connectors? - Page 1
Forum section: electronics / testgear

author: Isamun
author_rank: Regular Contributor
timestamp: January 14, 2015, 08:11:10 pm
content: I am working on an automated test system that include some differential scope measurements. I've been looking at theAgilentKeysight InfiniiMax probe amps, and Im wondering if anyone can identify the "MCX-rp-ish" coax connectors used on these probe amps.Seen this guy before?Edit: Fixed image

author: free_electron
author_rank: Super Contributor
timestamp: January 14, 2015, 08:28:32 pm
content: yep. seen that guy before. on infinimax probessimply buy the probe leads from agilent. they have matched lengths to solder tips available.

author: Isamun
author_rank: Regular Contributor
timestamp: January 14, 2015, 08:32:55 pm
content: Quote from: free_electron on January 14, 2015, 08:28:32 pmI'll take that as a no to my question. These connectors are not "stock".Ow well. Time to pay up.Thanks though.

author: Gribo
author_rank: Frequent Contributor
timestamp: January 15, 2015, 11:57:10 am
content: Amphenol has a reverse polarity MMCX line:http://www.amphenolrf.com/amphenolrfadmintool/news/RP-MMCX.pdfIt might be cheaper to get it from Keysight.Edit:Linx technologies has reverse polarity MCXhttps://www.linxtechnologies.com/en/products/connectors/rp-mcx

author: Isamun
author_rank: Regular Contributor
timestamp: January 17, 2015, 10:16:22 pm
content: Quote from: Gribo on January 15, 2015, 11:57:10 amThanks for the tip. I've been digging a bit myself. Seems like I could use theGPOseries from Corning Gilbert. These also seems to be compatible with the standard SMP connector. I will post back when I get some in the mail.
Does a 10x or 100x coil exist for clampmeters? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: January 15, 2015, 10:07:35 pm
content: Hi Everyone,I know about the AC line splitters that have a 1X and 10X hole where the wire is wrapped 10 times around the 10X one.Do they make a general tool or fixture that is a single wire loop like this, 10X or even 100X. I realize I could just make one with wire, I just wonder if something like this exists and what it might be called.Thanks,Alan

author: SeanB
author_rank: Super Contributor
timestamp: January 16, 2015, 07:36:10 pm
content: Google for current transformers.
TDS7054 restore Serial Number - Page 1
Forum section: electronics / testgear

author: Michara
author_rank: Newbie
timestamp: January 12, 2015, 07:07:50 pm
content: Hello, I have replaced the battery in my TDS7054 PPC NVRAM . I entered the VxWorks boot parameters again. The TDS is running again. :-) My problem is the serial number of the TDS. How can I restore the serial number on NVRAM?thanks and regards Micha

author: Michara
author_rank: Newbie
timestamp: January 13, 2015, 05:54:36 pm
content: What is the syntax of c : \ vxBoot \ .sn ?Micha

author: Jwalling
author_rank: Unknown
timestamp: January 14, 2015, 06:09:36 pm
content: Quote from: Michara on January 13, 2015, 05:54:36 pmHi,I cannot attach a .sn file from a TDS7054. I get an error message that it's not allowed.It looks like the attached.Create a file and edit it with a hex editor to reflect your serial #.It should be 11 hex bytes in size.Jay

author: Michara
author_rank: Newbie
timestamp: January 16, 2015, 07:19:37 pm
content: Thank you, works again. Option 3M is back.Micha

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2015, 07:42:09 pm
content: Quote from: Michara on January 16, 2015, 07:19:37 pmNice! Glad to be of help!Jay
Identify component on an Agilent 54825A - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: January 15, 2015, 06:24:43 pm
content: Hello,Was wondering if anyone could identify three components on an Agilent 54825A ACQ board. They are marked VC1 VC2 and VC3 and located near the AUX trigger.My first guess is a cap, but these look real weird as they have a slightly rounded top, and a dot in the center of the part.Thanks!Jay

author: malch
author_rank: Regular Contributor
timestamp: January 16, 2015, 12:14:59 am
content: Varicap diode – AC capacitance varies according to the DC voltage applied ?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 16, 2015, 01:19:24 am
content: Polymer type TVS seems more likely. "VC" isn't a standard refdes in any case.Tim

author: free_electron
author_rank: Super Contributor
timestamp: January 16, 2015, 06:38:56 am
content: Transient suppressor vc = voltage clamp

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2015, 11:38:19 am
content: Quote from: free_electron on January 16, 2015, 06:38:56 amThat makes sense - thanks!
Can you connect a USB keyboard to a Rigol DS1000z series scope? - Page 1
Forum section: electronics / testgear

author: BlueBill
author_rank: Regular Contributor
timestamp: January 17, 2015, 08:11:55 pm
content: Can you connect a USB keyboard to a Rigol DS1000z series scope?

author: DanielS
author_rank: Frequent Contributor
timestamp: January 17, 2015, 08:44:16 pm
content: I tried connecting my keyboard to it and there was no on-screen indication that it detected anything. Going in the Label Edit, it is not getting anything either.Looks like USB is for images and settings storage only.
Rigol 1054Z cursor question - Page 1
Forum section: electronics / testgear

author: retrojim
author_rank: Newbie
timestamp: January 15, 2015, 07:30:22 pm
content: I currently have a Rigol 1052E but I'm thinking of upgrading to a 1054z. While I generally love the 1052E it bugs me that I can only have 2 cursors on screen at a time. I was curious if the 1054Z will let you have both X and Y cursors on simultaneously (e.g.: 2 X and 2 Y).Can any of you 1054Z owners answer this?--Jim

author: Lightages
author_rank: Unknown
timestamp: January 15, 2015, 07:35:23 pm
content: Yes, both the X and Y axis cursors are available at the same time.

author: retrojim
author_rank: Newbie
timestamp: January 15, 2015, 07:43:37 pm
content: Thanks for the reply.Just to be clear, you can have TWO x and TWO y cursors on at the same time, right? Because the 1052E lets you have x and y on at the same time but only one of each.--Jim

author: Lightages
author_rank: Unknown
timestamp: January 15, 2015, 07:47:11 pm
content: Yes, two of each axis at the same time, in other words, four.

author: retrojim
author_rank: Newbie
timestamp: January 15, 2015, 08:05:09 pm
content: Excellent, thanks!--Jim
DC power supply advices/recommend? corrected mistake. - Page 1
Forum section: electronics / testgear

author: hopeANDhope
author_rank: Contributor
timestamp: January 15, 2015, 02:39:42 am
content: Hi,For a future purchace, i am looking for dc power supply options. near the range of 150$-200$. I aim for a tripple output product.Since i live in Europe and i want to avoid import charges, i have fixed my eye to this DC power supply:http://www.ebay.com/itm/Dual-Linear-DC-Power-Supply-50V-5A-Variable-Adjustable-Regulated-Lab-Grade-/120944886140?pt=LH_DefaultDomain_0&hash=item1c28e0817c[]CORRECTED LINK[]http://www.ebay.com/itm/291213146317?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AITI am not sure if this specification is good enough: ripple and noise: C.V. <20 mVpp / D.C. <50 mApp .The output seems OK :Parallel Mode: Output variable from 0 to 30 Volts, 10 Amps max.Serial Mode: Output variable from 0 to 60 Volts, 5 Amps max.It is very heavy though!12.5kgr. Certainly not portable. But it somehow seems a good value for money. It is not a known top brand name, so i do not know the durability of it over time.Would you recommend it as a good purchace based on what it promises? They list the features of the product down below. I would like to hear an expert's advice. If there is any other (better?) power supply to propose i would be glad to be pointed to and have a look.I intent to use a power supply for general purposes mostly. I might need it every now and then for some demanding test + home applications.ty.I emailed them and asked them how noisy it is when it is operating but i got no reply.

author: tautech
author_rank: Super Contributor
timestamp: January 15, 2015, 09:42:17 am
content: Have you 110 VAC mains? This PSU looks like it is intended only for the US market, and won't deliver outside US. See "About Shipping".Ripple sec is stated as:low ripple voltage less than 0.5 mVp-pwhich is very good.Weight indicates it is NOT a switching supply as stated but a linear PSU and portability is commonally sacrificed with linear PSU's. This is not bad, transformers full of copper & iron aren't featherweights.Check this seller for his range:http://www.aliexpress.com/store/917544

author: hopeANDhope
author_rank: Contributor
timestamp: January 15, 2015, 03:32:22 pm
content: I made a mistake . I corrected the link.

author: tautech
author_rank: Super Contributor
timestamp: January 15, 2015, 07:18:33 pm
content: You biggest concern with a PSU is power on spikes.They can be large enough to fry sensitive components.While that PSU looks OK, unless it's behaviour is known you are taking that risk.As you have spotted it is a 2 fan unit so it could be noisey, but does it have a smart controller for the fans. They may noy operate at all under light loads.More research required IMO.
Remote power control of your devices - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: January 15, 2015, 06:30:50 pm
content: Not sure if I am the only one who filled up Ikea furnitures in the basement with loads of HP and other equipment...As I can control them all through a small Intel NUC running Linux I was also too lazy standing up to manually power them on or off (o;So I'm using now those small Netio-230C devices:http://www.koukaam.se/kkm/showproduct.php?article_id=1714..which can control 4 AC outputs via a web interface, or in my case, accessing a special URL called from PHP script:Code:#!/usr/bin/php<?phpif(isset($argv) && isset($argv)){switch($argv){case'dso':if($argv =='on')$p='1uuu';else$p='0uuu';$u='http://10.0.250.1/cgi/control.cgi?login=p:admin:admin&p=';break;case'dmm':if($argv =='on')$p='uu1u';else$p='uu0u';$u='http://10.0.250.1/cgi/control.cgi?login=p:admin:admin&p=';break;//add more as you like ;-)}}// create a new cURL resource$ch=curl_init();// set URL and other appropriate optionscurl_setopt($ch,CURLOPT_URL,$u.$p);curl_setopt($ch,CURLOPT_HEADER,0);// grab URL and pass it to the browsercurl_exec($ch);// close cURL resource, and free up system resourcescurl_close($ch);?>To switch on a device I just call in the shell:Code:netio dso onHaven't found a device with GPIB interface though ;-)
Rigol Oscilloscope to Projector? - Page 1
Forum section: electronics / testgear

author: txphy
author_rank: Newbie
timestamp: January 14, 2015, 06:18:17 pm
content: Hello! I just purchased a Rigol DS1052E 50 MHz oscilloscope for some basic work with classroom demonstrations of soundwaves. What is the best way to enlarge the display so a lecture hall audience can see the waveforms? Is there a means to directly connect this oscilloscope to a standard projector? Thanks for your help!

author: Fsck
author_rank: Super Contributor
timestamp: January 14, 2015, 06:21:51 pm
content: link it to a computer, use projector as monitor for said computer. you can also remote control via computer. it doesn't have any graphics out iirc so it's either that or record the screen with a camera.

author: xenocide702
author_rank: Contributor
timestamp: January 14, 2015, 06:24:32 pm
content: As Fsck said the scope doesn't have any direct graphics output, you'd have to do USB to PC and use Ultrascope or some other control software, then connect the PC to the projector. The software isn't all that great, but it's usable.

author: txphy
author_rank: Newbie
timestamp: January 14, 2015, 06:42:04 pm
content: So, it sounds like controlling it via USB port to computer is the way to go, then simply slave the computer's display to the projector? One more issue: I'm running a Mac. Is there any easy way to do this? (I can follow directions, but I am not a computer scientist or EE, so feel free to use basic terminology- haha.) Thanks again!

author: rt
author_rank: Regular Contributor
timestamp: January 14, 2015, 06:44:35 pm
content: Laptop with external webcam pointed at the Rigol screen with video out going to the projector?

author: Pjotr
author_rank: Frequent Contributor
timestamp: January 14, 2015, 07:11:39 pm
content: Some way the EE tool suppliers forced us EE's to stick to PC's anywayThink your best bet is to hook up a USB camera or a camera directly to the beamer.

author: txphy
author_rank: Newbie
timestamp: January 15, 2015, 02:10:22 pm
content: Webcam sounds like a great workaround idea. Thanks for the help!!!
DMM: Diode Checking: Measurement Current - Page 1
Forum section: electronics / testgear

author: ElektronikLabor
author_rank: Regular Contributor
timestamp: January 19, 2015, 10:01:47 am
content: When you use an multimeter to measure the threshold voltage of a diode, the multimeter sends a small current through the diode and measures the Voltage across it. Correct me if I'm wrong.Are there any standards how big this current should be? On the most modern DMMs it's seems to be 1mA. Is it always so?

author: Elantramax1
author_rank: Contributor
timestamp: January 19, 2015, 11:08:38 am
content: What about the Voltage? I am in the market for a Good DVM for Automotive repair. And read customer reviews about the V on some meters not being high enough. It was usually the Meters with the AA batteries vs. the 9V units. The Bosch I am considering shows (In manual) Good Diode at .4-.9v. And a Bad 1.0-3.0. I am looking at an Innova 3340. The Manual shows Diode check .6ma. But shows open V at 2.8
DC Electronic Load with "dirty" input  - Page 1
Forum section: electronics / testgear

author: devanno
author_rank: Regular Contributor
timestamp: January 15, 2015, 12:37:38 am
content: Hi all, I'm trying to avoid what might be an expensive faceplant. I just got a M9711 DC Electronic Load to test some power supply output. My question is this... what if the power supply output is PWM DC or has an induced noise source in the circuit somewhere? Do I run the risk of frying my load? I would think not as long as the voltage and current are low enough, but since these electronic loads are new to me, thought I'd rather look stupid by asking rather than toasting a brand new piece of gear and REALLY looking stupid.Thanks in advance....Darryl

author: georges80
author_rank: Frequent Contributor
timestamp: January 15, 2015, 12:47:10 am
content: I've used my M9812 with various LED drivers (30 - 100W) that have PWM outputs when dimming (output current switched ON/OFF at a few hundred Hz) and not had any issues.cheers,george.

author: devanno
author_rank: Regular Contributor
timestamp: January 15, 2015, 01:29:00 am
content: Thanks, George... appreciate the confirmation!
logic analyser pro level - Page 1
Forum section: electronics / testgear

author: Christopher
author_rank: Frequent Contributor
timestamp: January 14, 2015, 10:42:03 pm
content: Looking to get a logic analyser after having a nightmare with the lecroy logic studio at work.Looking for something simple to do ii2c and spi mainly but more protocols (can!) would be nice.Speed is a max of 20mhz spi but usually work with less than a mhz.Have heard good things about the saleae but they have a 3 week lead time. I want it tomorrow !Obviously the hardware isn't too muxh of an important thing the software will be very important. I want something that I can plug in and go.Digital outputs would be good, to act like an i2c/spi master but it isn't a show stopper

author: Pinkus
author_rank: Frequent Contributor
timestamp: January 15, 2015, 08:59:20 am
content: I can recommend the Intronix Logicport (www.intronix.com).They send with DHL Express - but from the US. It usually takes 2 days but because of the weekend it will be Monday for you.

author: Scrts
author_rank: Frequent Contributor
timestamp: January 15, 2015, 09:18:59 am
content: Maybe BusPirate would be a solution for you? At least cheap thing to try out.

author: Mark_O
author_rank: Frequent Contributor
timestamp: January 15, 2015, 04:14:51 pm
content: Quote from: Christopher on January 14, 2015, 10:42:03 pmWow, that's an expensive bit of kit to be having nightmares with.QuoteFor loads of protocols (including CAN) and ease of use, I can recommend USBeeSX. But...Quote...max decode rate on SPI was about 8 MHz. All of the streamers are constrained by USB2 speeds, unless they're using USB3 (at significantly higher cost).QuoteThe USBeeSX can do that, but I don't think at the same time it's acquiring. I.e., the hardware capability is built in, but there are two separate pieces of software for input vs. output.

author: coppice
author_rank: Super Contributor
timestamp: January 15, 2015, 04:31:21 pm
content: Quote from: Pinkus on January 15, 2015, 08:59:20 amThat device has a number of good qualities, but its limited buffer memory can be a serious limitation.

author: deephaven
author_rank: Frequent Contributor
timestamp: January 15, 2015, 04:40:03 pm
content: Quote from: coppice on January 15, 2015, 04:31:21 pmI have one too and very impressed with it. It does have a data compression option which provides efficient usage of the memory, i.e. quiet periods don't use much memory.
HY5020E Variable 0-50V/20A DC Regulated Power Supply ?? - Page 1
Forum section: electronics / testgear

author: TSL
author_rank: Regular Contributor
timestamp: January 15, 2015, 10:03:47 pm
content: Hi all,I'm on the verge of buying one of these power supply's for work on RF amp pallets and I was wondering if anyone had experience with them ?They are branded Mastech, Dr Meter and others.Functionally I need a 13.8v to 48v and up to 20A with settable limits, so I'm open to suggestions for reasonably priced alternatives.thanksTim
Keysight 2000 or 3000 X-Series WaveGen modulation issue - Page 1
Forum section: electronics / testgear

author: peter-ger
author_rank: Newbie
timestamp: January 10, 2015, 08:24:17 pm
content: Hello guys,looking arround on YouTube I found that one:the owner has a 2000X, I checked that behavior on my 3000X: same thing.Strange.Regards,Peter

author: LabSpokane
author_rank: Super Contributor
timestamp: January 11, 2015, 01:41:21 am
content: The modulation function is not an arbitrary waveform generator.

author: georges80
author_rank: Frequent Contributor
timestamp: January 11, 2015, 05:19:54 am
content: ^ exactly right. Modulation has no spec on where it starts relative to the waveform being modulated. So, obviously each time you enable modulation it will start up at some different point. Even more so when the modulation frequency is different than the source frequency...If the youtube fellow wanted a specific waveform then he should have been using an arb generator. Even my reasonably high end Agilent 33250A has no way to 'lock' the modulation phase to the source signal.cheers,george.

author: engiadina
author_rank: Contributor
timestamp: January 13, 2015, 09:54:35 pm
content: It won't help the youtuber ...but the trusty Tek AFG3000 series dual channel wavegens are actually capable of doing this. You could use the second channel as modulation source.Good thing is, that one can actually phase lock both channels and adjust the phase afterwards.I rarely see those but I think they are quite an underestimated piece of equipment.Guido

author: Electro Fan
author_rank: Super Contributor
timestamp: January 13, 2015, 11:37:11 pm
content: Slightly off topic but this review discusses what can be done to phase lock two signals on the Agilent/Keysight 33522B:http://www.element14.com/community/roadTestReviews/1359Part way down the article the reviewer notes that Agilent and Tek use different units (degrees vs. time) to define phase; toward the end the reviewer notes that Agilent updated the firmware to allow degrees, time, and radians.Not sure how much flexibility there is though regarding the situation described by georges80 but it was my impression was that the 33522B could lock the modulation phase to the source signal - but maybe not?.From the article in the link:"The unadjusted raw phase delay between the two channels is shown in Figure 10 and is measured to be about 1.4 ns. Not bad at all. The phase difference between the two channels can be nulled through a quick twirl of the universal knob. Once nulled, a new zero point can be set from the phase menu using the "Set 0 Phase" option (Figure 11)."Figure 11 Setting adjusted phase delay to 0.00 degrees:http://www.element14.com/community/servlet/JiveServlet/downloadImage/105059/Set+0+phase.JPGI agree with engiadina that the Tek AFG3000 series might be underestimated. Both the 33522B and the AFG3000 look pretty nice.EF
34401A Service Notes - Page 1
Forum section: electronics / testgear

author: LaurentR
author_rank: Frequent Contributor
timestamp: January 13, 2015, 02:22:22 am
content: While doing my homework to buy a used 34401A, I stumbled upon an Agilent Service Note for the 34401A and dug a bit to find a good source for all the Service Notes. I actually found a Keysight page where they are listed:http://litstation.marketing.keysight.com/litapp/SearchSN.do?method=openExternalSNSearch&prodNum=34401A

author: Bryan
author_rank: Frequent Contributor
timestamp: January 13, 2015, 05:48:56 am
content: Good catch, thanks for link.

author: HighVoltage
author_rank: Super Contributor
timestamp: January 13, 2015, 10:53:18 am
content: I did not know that there was a new Service Note for the 34401A from June 2014Thanks !
Vintage Motorola Oscilloscope - Page 1
Forum section: electronics / testgear

author: tideo
author_rank: Newbie
timestamp: January 13, 2015, 01:42:47 am
content: I have this vintage Motorola Model T1015A oscilloscope. It looks ancient, but in my opinion it just looks beautiful. I was wondering if any of you guys know anything about this model. I've done a little research but I couldn't find anything. My father says that this scope doesn't have transistors and that it has vacuum tubes. I haven't confirmed that yet but if true then it must be indeed a really old scope. I would like to know how much of a jewel this scope actually is.

author: aviphysics
author_rank: Contributor
timestamp: January 13, 2015, 01:49:46 am
content: Well, if you take the back cover off, it would probably be pretty clear if it has vacuum tubes.It doesn't have any name plate or model number anywhere on it?If I am reading those frequency settings right, it is very much an art piece at this point. Looks just fast enough to display audio stuff and otherwise probably not very useful.Edit: what does it say at the bottom? I can read "model" followed by some numbers/letters.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: January 13, 2015, 01:51:08 am
content: Looks pretty reasonable. The hammertone finish, and stripped-down-Tektronix layout, were popular on medium to nicer things back in the day I think.Take the cover off and see what's inside!If it hasn't been used in years, it should probably be turned on gradually (with a variac, or series resistance such as light bulbs) to allow capacitors to reform. Which should probably be replaced anyway (even if it's part or all solid state after all).Tim

author: radioFlash
author_rank: Regular Contributor
timestamp: January 13, 2015, 02:12:53 am
content: Someone mentioned this was a rebadged Heath IO-10.Some discussion of the Heath IO-10:https://puck.nether.net/pipermail/heath/2001-October/008609.htmlAssembly manual for the Heath IO-10:http://tubularelectronics.com/Heath_Manual_Collection/Heath_Manuals_IO-IP/IO-10/IO-10.pdf
Volteq function generators - Page 1
Forum section: electronics / testgear

author: drakke
author_rank: Regular Contributor
timestamp: January 03, 2015, 05:25:50 pm
content: Hello,I am looking for a function generator suitable for student use. I don't want to spend too much but I want something to last for maybe 2 yrs.I searched these forums and searched ebay for BKPrecision 4011, 3011B, HP 8111A, HP3312A and siglent SDG series. Also considered some very simple offshore 'circuit board' types etc.But this looks most interesting:http://www.volteq.com/function-generator.htmlWhat is your opinion of Volteq?Thanks.

author: saturation
author_rank: Super Contributor
timestamp: January 11, 2015, 05:39:27 pm
content: Volteq is the renamed Mastech AKA Quakko brand from California.

author: rf-loop
author_rank: Super Contributor
timestamp: January 11, 2015, 06:00:35 pm
content: Perhaps made by Mei-Li (or some supplier) and sold also with name MCHhttp://mch.en.alibaba.com/product/540829630-219145438/MFG_3010_function_generator_10Mhz.htmlAlso available with what ever brand and model number sticker you want.I have some of these in stock but not in active sale due to quality under my standards.. On the cartons I have yellow sticker: Sell as junk, pay something and take away "as is" and warranty ends when you go and close door)

author: saturation
author_rank: Super Contributor
timestamp: January 11, 2015, 07:17:37 pm
content: I concur with rf-loop, and thanks for that find. In general, an OEM device that has no real reputation on its own and is sold by so many that its hard to pin a reputation on it, is a big gamble to buy. Even if X-OEM works, Y-OEM may not work as well as it depends on the OEM's QC and how X or Y does their QC after they receive OEM's shipment. Also, how serviceable it is, so you can do DIY repairs, or its longevity are all questionable even if it worked OOB.Sold as Mastech:http://www.amazon.com/Acifica-0-2Hz-2MHz-Bench-Function-Generator/dp/B000E14DOE/ref=cm_cr_pr_product_topThen later sold as Volteq:http://www.amazon.com/Function-Generator-Frequency-Counter-SFG-1002/dp/B00PXJITQK/ref=sr_1_1?ie=UTF8&qid=1421003699&sr=8-1&keywords=volteq+generatorYou may find reviews elsewhere by omitting the brand name, just the product number and compare the chassis.OTAH, we did extensively review and test 2 low cost FG available in North America, the Instek SFG 1003, $150 shipped from Tequipment, and the Hantek DDS-25 or its updated 1025, also $150, reviewed elsewhere on the forum. Before I obtained and tested both, I culled reviews elsewhere to see if it was durable enough to consider testing to higher standards.FWIW, Instek is very reputable from Taiwan, and Hantek is decent from China, regardless what country you buy it from, assuming its not counterfeit.For other makes, local support can help a lot, if you have dealers like rf-loop, his support and testing make other branded products good choices, say in Finland.
Cheap (Korad KA3005P)  vs. Cheaper (Tekpower TP1503C) Power Supplies - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: January 14, 2015, 01:16:13 am
content: Comparing Cheap and Cheaper DC Power Supplies:PS#1 (Cheap): Korad KA3005PPS#2 (Cheaper): Tekpower TP1503CDUT: 555 breadboard circuit used to generate square waves. Same test leads are used to compare the power supplies.Both power supplies set to output 4 volts.With the Korad I can get pretty decent square waves – they have some ringing and some amount of overshoot. The circuit draws about 8 mA.With the Tekpower the square waves have less ringing and more overshoot, especially on the tops. The circuit draws about 12 mA. If I try to adjust the amperage on the power supply downward below 12 mA the circuit becomes current limited and the voltage sinks.The main reason I purchased the Tekpower was to have the built-in analog meters – but maybe the analog meters are drawing more current?I think both power supplies are not showing their best because I probably have less than ideal grounding in the circuit and test leads. I realize neither of these power supplies are going to challenge Agilent, Rigol, etc – I’m just trying to see what experienced EEVers interpret from the waveforms, if anything – might just be bad operator test setup.I think I feel better about the Korad ringing than the additional overshoot on the TekpowerAny thoughts on the differences you see in the cheap vs cheaper power supply examples? Thanks, EF
Arduino instead of Rasp Pi - Page 1
Forum section: electronics / testgear

author: bigone5500
author_rank: Contributor
timestamp: January 11, 2015, 12:33:06 am
content: I see folks using a rasp pi to run a code to unlock the DS2072. Can an arduino be used instead?

author: miguelvp
author_rank: Super Contributor
timestamp: January 11, 2015, 01:46:04 am
content: That was a long time ago, now they do it with a web browser

author: bigone5500
author_rank: Contributor
timestamp: January 11, 2015, 01:54:35 am
content: Quote from: miguelvp on January 11, 2015, 01:46:04 amPlease do elaborate!!!I will be purchasing one of these in the next month.

author: miguelvp
author_rank: Super Contributor
timestamp: January 11, 2015, 04:09:09 am
content: http://www.gotroot.ca/rigol/riglol/Edit: But I don't know if it works on the DS2072AThere is an old thread here:https://www.eevblog.com/forum/testgear/ds2072a-upgradeunlock-firmware-link-no-longer-works/And the monster thread:https://www.eevblog.com/forum/testgear/sniffing-the-rigol's-internal-i2c-bus/And this:https://www.eevblog.com/forum/testgear/ds2000a-upgrade-utility/Doing a search on the forum will give you even more links. But if you get the A version the last link should get you what you want, not through the webpage but via a program.
MDO3000 500 MHz and 1GHz models - Page 1
Forum section: electronics / testgear

author: FivePoint0
author_rank: Contributor
timestamp: January 12, 2015, 10:40:25 pm
content: After reading a little about the DPO3000 I got reading about the new MDO3000, specifically that the 500 MHz and 1 GHz models are different hardware, anyone know more about this?
HP 3497A, 3488A breadboard card projects - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: January 10, 2015, 11:30:44 pm
content: As I have a 3497A breadboard card...no one for 3488A yet though....I'm wondering if anyone did a project on those cards or has seen any projects based on them?Or maybe a good point to collect some ideas for those controllers....(dunno if any more HP controllers exists, which are affordable ;o)My project list would be:- Audio multiplexer (analogue/SPDIF) similar to HP 4472A- Ethernet multiplexer (RJ45 and SFP)- Frequency counterAny more ideas very welcome (o;
Rigol: MSO2072A-S or MSO2072A + DG1022A ? - Page 1
Forum section: electronics / testgear

author: onesixright
author_rank: Frequent Contributor
timestamp: December 08, 2014, 04:31:18 pm
content: Hi Guys,Was looking here in the forums (and google) but could not find it, i hope im not re-askingHow does Rigol's built-in waveform generator MSO2072A-S, compare to the standalone version DG1022A? Would it be wiser to separate the two devices (MSO2072A + DG1022A), or rather have the two-in-one option (besides saving space)?The built-in is a bit cheaper then two separate devices. At this point i don't have a WG, and would love to have one.I basically want to know what would be better/smarter?Thanks!

author: dsolodov
author_rank: Newbie
timestamp: January 09, 2015, 07:14:37 am
content: What option did you choose at the end?

author: onesixright
author_rank: Frequent Contributor
timestamp: January 09, 2015, 08:20:13 am
content: Well, with a DG1062Z and a MSO2072AI reconsidered the DG1022A, was looking at the DG1032Z, but then that one wasn't on stock.They gave me a small discount on the both so i ended up with 60 MHz version.I figured two machines can't hurt, and the 1062 has more then double the bandwidth (not that i need that for the moment). So i guess for the coming years i'm good!

author: Electro Fan
author_rank: Super Contributor
timestamp: January 09, 2015, 10:18:05 am
content: Beautiful combination - Congrats! Please let us know if you have any thoughts regarding the process for creating arbs - either from the front panel or from a computer. EF

author: e_60
author_rank: Contributor
timestamp: January 10, 2015, 08:05:46 pm
content: I recently picked up a MSO1104Z-S, I quickly returned it due to some decoding limitations, but in the short time I played with it, I realized that having a built-in single generator results in a big compromise on ease of use (at least in the MSO1000Z and I suspected also on the MSO2000A), so when I got the MSO2072A I opt'd not to get the -S, and will get a standalone signal generator. Maybe if you carry the scope to job sites, or have very limited space etc it could be worth dealing with the user-interface issues to have a built-in one. Just my thoughts anyway.
Tektronix DPO/MSO 3000 and 4000 application module - Page 1
Forum section: electronics / testgear

author: Lunasix
author_rank: Regular Contributor
timestamp: January 10, 2015, 03:36:56 pm
content: Also works on these scopesThe text string is beginning with DPO3 or DPO4, followed by module's name.https://www.eevblog.com/forum/testgear/mso2000-application-module-hack/60/
Rigol MSO2000A Logic Analyzer Memory Depth Display Problem - Page 1
Forum section: electronics / testgear

author: e_60
author_rank: Contributor
timestamp: January 10, 2015, 04:34:36 am
content: Hello All!I am having an issue with my new Rigol MSO2072A Firmware 00.03.03.01.Basically it goes like this. I set my horizontal to 100.0us / 1.40M pts / 1.000 GSa/s.When I open the acquire menu I see MemDepth is Auto and LAMemDepth is 1.40M pts.I have my scope in run mode, with trigger configured as normal, and it is looking for falling edge on my chip select of an SPI bus.When my trigger is hit and I capture a packet, I can see the decode trace showing that it successfully decoded data and it is aligned properly with the edges on the data shown above. The event table also shows that I have successfully received the entire transmission.However when I start using the horizontal scale knob to zoom in so I can see the actual data (on the trace not in the event table), it is shrinking the LAMemDepth which each turn and my decoded data disappears, even if I zoom back out there is no longer any decoded data, but clearly all the clock/data traces are still intact with all the information.If I put the scope into STOP, then adjusting the horizontal does not make the decoded data go away, but I must remember to change the scale back before hitting run otherwise the LAMemDepth will then change to the new low number reflecting what I am viewing.Now, if I repeat this however I set MemDepth to 1.4M Points in the acquire menu instead of auto, I can then zoom in and out of my information while running or stopped without changing the Logic Analyzer memory depth, however despite the fact I have set the MemDepth to 1.4M, the LAMemDepth is 700k pts, and I think this is actually causing an issue with how the information is plotted on the screen.It seems that the actual digital/analog traces are being plotted based on the 1.4M total points, however the decoded data traces are being plotted based on the 700k pts, so they are not aligned horizontally.I am brand new to Rigol, this is also my first MSO. Previously I have used my dedicated logic analyzers in conjunction with a Fluke Scopemeter , so when I encounter an issue with the Rigol, my first thought is user error on my part, but in this case I feel like this is enough to ask the forum for advice if I should escalate this to Rigol, or if I am just being a dumb user.I have attached an image, which shows the issue I suspect exists. I believe the decoded data should be aligned, but it is not.Thanks!
Who are the people buying new $800 low end analog oscilloscopes? - Page 1
Forum section: electronics / testgear

author: aviphysics
author_rank: Contributor
timestamp: January 10, 2015, 04:01:34 pm
content: Decided to click on the analog scope link at Tequipment and was baffled by what I saw. Presumably, BK Precision wouldn't be making this stuff if no one was buying them, but I fail to understand why anyone would spend that much for a low end 2 channel analog scope. Especially when you can get a used one for so cheap (I bought my BK Precision 2160 w/ probes included in 2006 for $50, which just makes it all the more shocking)http://www.tequipment.net/oscilloscopes/analog-oscilloscopes/#/oscilloscopes/analog-oscilloscopes/?F_Sort=3

author: wraper
author_rank: Unknown
timestamp: January 10, 2015, 04:04:29 pm
content: As people say on this forum about every crap overpriced piece of test equipment - "good for education".

author: zapta
author_rank: Super Contributor
timestamp: January 10, 2015, 04:43:14 pm
content: Guess what ad I got in that analog oscilloscopes page ;-)

author: Neilm
author_rank: Super Contributor
timestamp: January 10, 2015, 06:14:39 pm
content: I have worked with people who absolutely against digital scopes because they "are not as good" and "too noisy".I didn't try to enlighten him just made sure I got to the guy signing my req for a new MSO3000 before he did.

author: whipman
author_rank: Contributor
timestamp: January 10, 2015, 08:07:43 pm
content: Funny thing is when you click on the Rigol DS1000Z 4 channel banner at Tequipment it shows 2 channel scopes. Not a 4 channel in the bunch!

author: vk6zgo
author_rank: Super Contributor
timestamp: January 11, 2015, 04:11:22 am
content: Quote from: aviphysics on January 10, 2015, 04:01:34 pmAltronics & Jaycar used to have a lot of over priced low-spec analog 'scopes .The basic 10 MHz single channel was $135 which was OK,if you wanted a basic 'scope in a hurry,but as soon as they mentioned 2 channel,the price skyrocketed.Now they have a lot of low-spec &veryoverpriced DSO's!
How to decode the listing of state mode for 8 bit uP using Agilent 16702B - Page 1
Forum section: electronics / testgear

author: nadona
author_rank: Regular Contributor
timestamp: January 09, 2015, 11:50:08 pm
content: I bought a Agilent 16702B a while ago. I finally got a working module of 16754A and 16752A.How do I decode(disassemble) the state mode listing of 8 bit microprocessor like 6809, 8085, z80 with this logic analyzer? Do I need special software and/or modules?I have lots of manual downloaded from Keysight website but couldn't find example or info about 8 bit microprocessor decoding.
HP 3497A cards insertion - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: January 07, 2015, 06:12:05 pm
content: Just received recently a new board with DVM option together with some additional cards to plug in...Before I break anything....are those cards for the slots really hard to insert?Do I need a hammer to force it? (o;

author: davorin
author_rank: Unknown
timestamp: January 09, 2015, 05:07:14 pm
content: Got it sorted now (o;Seems my 3497A never saw a card before...so I first pushed in several types a small prototype board into the slots...After that insertion of the cards was much easier...still needed force though.....and yes....push in the card first, then the connector block...much easier that way...
Rigol MSO1104 CSV export problem [SOLVED] - Page 1
Forum section: electronics / testgear

author: FrankT
author_rank: Regular Contributor
timestamp: December 26, 2014, 12:08:20 am
content: Two more problems when exporting the waveform data as a CSV...1) I'm not sure if this is a bug, or just the way CSV export works, but the Sequence column skips numbers Eg, a 30kpts export did this at 16k...16381 -4.91 4.31 5.24 0x5316382 -4.91 4.31 5.24 0x5316383 -4.91 4.31 5.24 0x5365536 -4.91 4.31 5.24 0x5365537 -4.91 4.31 5.24 0x5365538 -4.91 4.31 5.24 0x53I'm not sure if that is a bug, or the sequence number is related to internal storage, but it does seem to always increase.2) The other problem, the logic analyser output doesn't seem to be anywhere near what was captured. I captured 3 lines of SPI (MOSI, CLK, CS) in both analog and digital, and there was no change in the digital output that matched the analog. In fact, I only exported 3 bits of LA data, I get 7 bits randomly toggle. (which could explain why SPI decoding doesn't work).

author: FrankT
author_rank: Regular Contributor
timestamp: January 09, 2015, 06:37:45 am
content: Also fixed by the latest firmware, 00.04.02 SP4.
Krohn-Hite 4300A Questions - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: January 09, 2015, 04:46:46 am
content: Hi,Anyone know what the basic operating procedure is for setting amplitude on a Krohn-Hite 4300A?1. What is the significance of the black (1-10) vs. red (1-3) rotary dial markings?2. Should the 1 volt button produce 1 volt when the rotary dial is set to 0, 1, 10 or something between 1 and 10? (On my unit the 1 volt button produces 1 volt when the rotary dial is set to about 7 on the black markings when looking at sine waves and about 10 on the black markings when looking at square waves - perhaps this is a rough approximation of .707 factor, or maybe it's just a coincidence?).3. Once the unit produces 1 volt on the 1 volt button, should it produce 10 volts when the 10 volt button is pressed - or should it then need further fine tuning with the rotary dial to produce exactly 10 volts?Thanks! EF
DS1000 - apparently 'missing' cursor measurements - Page 1
Forum section: electronics / testgear

author: Dave Turner
author_rank: Frequent Contributor
timestamp: January 08, 2015, 11:31:29 pm
content: I've been reading the DS1000Z User Guide obtained fromhttp://www.batronix.com/pdf/Rigol/UserGuide/DS1000Z_UserGuide_EN.pdfand was intrigued to see the cursor measurements depicted in chapter 6 pages 79-81.My DS1074Z-S shows just Ax Ay Bx By Ax-Bx Ay-By & 1/|dx|, whereas the manual depicts many more measurements.Is the manual incorrect/wrong one or have I missed something?Anyone else noticed this?
tektronics 2445, on switch lights up but scope doesn't start - Page 1
Forum section: electronics / testgear

author: CodeBanger
author_rank: Newbie
timestamp: January 09, 2015, 12:50:35 am
content: Hi all,I'm new to the site. I had a tektronics 2445 in storage for some time. When I first started it after the long rest it lit up fine. Now I pust the start button which lights up , but nothing else happens. I'm guessing that something in the power supply calved although all the components look good. I've read that capacitors would be the most likely culprits. If anyone has experience in this I would appreciate any help on how to proceed.Thanks in advance

author: c4757p
author_rank: Super Contributor
timestamp: January 09, 2015, 01:20:14 am
content: The power button doesn't light up, it's just a mechanical, plastic thingy. Do you mean the panel lights up? It has LED error codes, if so.If no error codes, first order of business is to take the cover off and probe the voltages. They're all brought out to a single DIP test socket on the analog mainboard; grab a service manual to help.

author: CodeBanger
author_rank: Newbie
timestamp: January 09, 2015, 01:48:12 am
content: Thanks for the response. You're right. I think this has tricked me more than once. Nothing lights up. Fuse is good .
Keysight U1253B Battery Question - Page 1
Forum section: electronics / testgear

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: January 08, 2015, 02:18:28 pm
content: The Keysight (Agilent) U1253B multimeter uses an 8.4V Ni-Mh rechargeable battery which is I guess ok, but I was a bit surprised they did not use Li-ion. I have quite a few Tenergy Li-ion 8.4V batteries that I could possibly use as an alternate source but was concerned about the differences in the charging mechanism in the U1253B. Has anyone used Li-ion batteries in this meter?