hybridfree/eevblog-posts huggingface dataset:
Rigol DS1104Z locking up while booting up. - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: November 28, 2014, 08:25:42 pm
content: Hello,About a month and a half ago, I purchased a Rigol DS1104Z. Everything was going OK until this morning when I tried to turn the oscilloscope on but was unable to do so.Basically, when I turn the oscilloscope on, the oscilloscope buttons turn on and off and I hear a couple of clicks. After that, the oscilloscope goes silent and gets stuck showing the boot up screen (the screen showing nothing but the Rigol logo).The scope has the original firmware and I have not tampered with it at all, its exactly in the same shape as it was when I received it from the factory.I tried contacting technical support but it looks like they are not working today. Anyone knows if there is a way to do some sort of hard reset on the scope to see if I can make it snap out of its problem?Thanks.

author: nanofrog
author_rank: Super Contributor
timestamp: November 30, 2014, 02:10:19 am
content: Have you tried getting a download of your firmware revision (or newer), plugging into the USB port and turning it on?Just to see if it will boot mind you, cancel out of actually updating the firmware.

author: Rene
author_rank: Regular Contributor
timestamp: November 30, 2014, 04:02:11 am
content: Hi Nanofrog.I tried doing that but it looks like you need to contact Rigol to get the firmware and they will probably not get back to me until Monday. I suppose I could download the firmware from some other site but I am not sure I want to do.I was hoping there was an easy way to reset the scope, something like pressing some key while bottling up but that does not appears to be the case.I just hope I don't have to send this back for repair. I can't believe this broke after just a few hours of use.

author: nanofrog
author_rank: Super Contributor
timestamp: November 30, 2014, 07:52:17 am
content: Quote from: Rene on November 30, 2014, 04:02:11 amHere's a direct download link forFW v.04.01.02.00(7-zip format).Source.Hope this helps get you up and running.
Info (and manual) about Schlumberger 5229 500MHz oscilloscope - Page 1
Forum section: electronics / testgear

author: qzertywsx
author_rank: Newbie
timestamp: December 02, 2014, 09:34:31 am
content: Good morning to all,This is my first post in this forum, so excuse me for any errors and for my (very) bad english.I have this oscilloscope, Schlumberger 5229, attached you can find a photo of it (Sorry for the bad quality).I think that this oscilloscope have some problem with the trigger function, some time works and is perfect but some time didn't work at all and the waveform is not blocked on the screen, in the attached photo the waveform is perfect.My question is:Somebody have the manual and/or the circuit diagram? Or somebody know where I can find it?This oscilloscope is a little bit different than the over I've used, so probably I'm using it incorrectly, the manual can help me to understand all the command.Thanks in advance for any answer.
FLIR E4 show wrong information.. - Page 1
Forum section: electronics / testgear

author: TaeSang
author_rank: Newbie
timestamp: November 23, 2014, 11:54:54 pm
content: Hi all,my FLIR E4 have a problem.Camera show wrong images. There are no hacks. no shocks. Anybody know how to fix for this issue?It just happen suddenly Last night just one time work well. But, Today morning happen again.ThxTaeSang

author: djQUAN
author_rank: Frequent Contributor
timestamp: November 30, 2014, 03:47:12 am
content: I also get that sometimes.But mine just shows a garbled image with nothing but noise. Then there is also the occasional freeze up where it just freezes the display and stops working. Buttons don't do anything when this occurs.The "fix" is taking out the battery and booting up again. It occurs randomly, I wasn't able to find any reason for it to occur. But if it is working, there aren't any problems unless these things happen again.mine is firmware 1.22 with the E8 hack. I hacked it a few hours after I got mine so I wasn't able to confirm if it occurs in stock form.
Shoelace and Lego block saves the day - DT9205N multimeter - Page 1
Forum section: electronics / testgear

author: retiredcaps
author_rank: Super Contributor
timestamp: November 29, 2014, 07:00:28 am
content: Saw this today ...http://laserpointerforums.com/f57/cheap-multimeters-not-even-twice-91909.htmlI think modemhead will have to try this on the faded 80 series I lcd as well!:tongue firmly planted in cheek:

author: dave_k
author_rank: Frequent Contributor
timestamp: November 29, 2014, 07:29:49 am
content: my eyes hurt after looking at that forum

author: miguelvp
author_rank: Super Contributor
timestamp: November 29, 2014, 07:34:10 am
content: You are supposed to have one eye covered so at least you still keep a good one.

author: dave_k
author_rank: Frequent Contributor
timestamp: November 29, 2014, 11:50:52 am
content: Ah yes."DANGER: Do not look into laser with remaining eye."

author: ModemHead
author_rank: Frequent Contributor
timestamp: November 29, 2014, 01:33:55 pm
content: The dark gray shoelace and yellow brick infringes on Fluke trade dress...
Keysight (Agilent) N9914A recent firmware and time setting limits - Page 1
Forum section: electronics / testgear

author: Gribo
author_rank: Frequent Contributor
timestamp: November 20, 2014, 08:15:30 am
content: Hello all,The latest firmware from Keysight doesn't allow changing time backwards more than 6 hours per day. However, if it uses NTP, it can be changed to whatever time you want. I think it might apply for other instruments.One more thing, if anyone uses these instruments in Labview environment, an update to the driver is required, as the IDN command returns Keysight instead of Agilent.

author: VK5RC
author_rank: Unknown
timestamp: November 20, 2014, 09:27:23 am
content: The 9914 has been on my wish list, any serious problems, would you recommend it or something else?

author: dave_k
author_rank: Frequent Contributor
timestamp: November 20, 2014, 11:46:23 am
content: Quote from: Gribo on November 20, 2014, 08:15:30 amThat's been the case for some time now (no pun intended) .. though for a while the NTP update never really worked properly. Fortunately it's been resolved.The N9914A is a great instrument to use, the VNA time domain option is an especially handy feature!

author: Gribo
author_rank: Frequent Contributor
timestamp: November 20, 2014, 12:37:02 pm
content: It is a great tool for the job, that is RF analysis outside the lab in the cold, harsh world. I can say it saved me lots of money testing cables, antennas and amplifiers at customer's sites.

author: VK5RC
author_rank: Unknown
timestamp: November 21, 2014, 08:13:45 am
content: Thanks for the comments, time to start saving!

author: dave_k
author_rank: Frequent Contributor
timestamp: November 29, 2014, 12:00:09 pm
content: There is one on eBay going for about $7000 .. being sold by Keysight as a refurb unit.
Risetime measurement on Rigol DS1052E - Page 1
Forum section: electronics / testgear

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 27, 2014, 08:44:01 am
content: Just to be 100% sure: Does the Rigol DS1052E measure risetime the normal way 10% and 90% of the step height ?This frame seems to indicate so....but if you intelligent guys could confirm it...im a happy manhttp://janengelbrechtpedersen.dk/risetime.png

author: tautech
author_rank: Super Contributor
timestamp: November 27, 2014, 08:55:05 am
content: I see 4.28 uS in red in the bottom right corner and that looks right to me from the trace seen on screen.(thinking back to the days when I had a CRO and NO luxury of on-screen measurements)

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 27, 2014, 09:50:52 am
content: Rise(1)=2.900uS|dX|=2.960uSWhat the number in red at the bottom means ? no clue ? From 0% to 100% ?

author: SL4P
author_rank: Super Contributor
timestamp: November 27, 2014, 11:43:40 am
content: The image I'm seeingdoesn't have a red value at bottom RH??The T-> 4.280us text indicates the trigger time...?Is that what you're asking.See the orange T symbol at the top-left... that's the Trigger marker, and the number at bottom RH is simply that horizontal 'trigger' time position wrt the trace start at 'zero'.

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 27, 2014, 03:28:36 pm
content: Well thx for reply...now i get the number in the right corner... still not totally shure if the RIgol meassure rise time from 10% to 90% it writes : Rise(1)=2.900uS and i can see it matches my 10% to 90% meassurement...so ok...lets say it does

author: rollatorwieltje
author_rank: Unknown
timestamp: November 27, 2014, 08:23:03 pm
content: http://www.rigol.com/download/Oversea/DS/User_guide/DS1000E%28D%29_UserGuide_EN.pdfpage 124 in this PDF.

author: janengelbrecht
author_rank: Regular Contributor
timestamp: November 27, 2014, 08:25:57 pm
content: ThxEmpty page

author: jancumps
author_rank: Unknown
timestamp: November 27, 2014, 08:58:04 pm
content: Quote from: janengelbrecht on November 27, 2014, 08:25:57 pmIt says:Quote

author: markce
author_rank: Regular Contributor
timestamp: November 27, 2014, 11:33:23 pm
content: Checked this against a Tek scope.Rigol DS1052E rise-time measurement is 10%-90% time of leading-edge.Confirmed with real test setup.I've been quite happy with pulse measurements on the small Rigol.

author: i4004
author_rank: Regular Contributor
timestamp: November 28, 2014, 08:56:54 pm
content: Quote from: janengelbrecht on November 27, 2014, 08:44:01 amdepends on the signal you're measuring, if it has some jitter then rise time will be more of an aproximation than precise value....you'll see it (auto mode) struggling with finding correct amplitude(s)/ie rise time.if in your case it's pretty still and non moving much, it should be correct.
DS1054Z - do not install the beta firmware! - Page 1
Forum section: electronics / testgear

author: orin
author_rank: Frequent Contributor
timestamp: November 28, 2014, 01:08:07 am
content: There are many reports of the knobs/keyboard not working and in my case, on some restarts, it acts as if keys are randomly being pressed.One would hope that an error in the firmware could not fry anything in the 'scope, but given the behavior I'm seeing, I cannot be sure and absolutely cannot recommend installing the beta version mentioned in the 'jitter' thread.Orin.
IR imagers: what do you use them for, what did you discover with them? - Page 1
Forum section: electronics / testgear

author: JFA
author_rank: Regular Contributor
timestamp: November 17, 2014, 08:24:15 pm
content: I always wanted to get a thermal imager.Eventually, I got one (well, a few). Hacked E4.It was an amazing discovery, new eyes on the world, a new vision.What are the uses you have for this amazing toy? What new stuff did you discover?My main discovery, most unexpected: hydraulics system debugging.You can see all the restrictions, oil flow generates heat everywhere there is a pressure drop.At work we used my Special Ed. E4 and spotted a hidden internally pinched hosethat was mysteriously screwing up with our new prototype. We also inspected everything elseand found out many mis-sized, overheating components (not only valves, but elbows, connectors, etc.We resized many components, saved money and increased performance.Even the hydraulics "specialists" were impressed.

author: dr.diesel
author_rank: Super Contributor
timestamp: November 17, 2014, 08:37:23 pm
content: My wife bought me one for X-Mas last year.Probably the most useful was finding all of the air/insulation leaks in my house and shop.

author: briselec
author_rank: Regular Contributor
timestamp: November 17, 2014, 08:51:20 pm
content: Used one recently when buying a house to check for termites in the walls.

author: Bud
author_rank: Super Contributor
timestamp: November 17, 2014, 11:33:24 pm
content: To find my black cat in the house at night with the lights turned off

author: ixfd64
author_rank: Frequent Contributor
timestamp: November 18, 2014, 12:19:33 am
content: I currently don't have a thermal camera, but I wouldloveto take pictures of everyday objects with one. Being able to see into the invisible wourld would be just amazing.

author: bronson
author_rank: Regular Contributor
timestamp: November 18, 2014, 04:48:35 am
content: Getting tire inflation right, very important when racing autos. Also looking for exhaust leaks.Looking for roof leaks and missing insulation.Finding overstressed components and traces on my PCBs (really want to get me a ZnSE closeup lens so I can actually see the mistake, not just a bloom in the area of the mistake...)The standard stuff.

author: Bud
author_rank: Super Contributor
timestamp: November 19, 2014, 03:34:21 am
content: Attached are shots of a sick person having fever and next day after intensive therapy.Interestingly, in both cases the hottest spots are the corners of the eyes.

author: simmiv
author_rank: Contributor
timestamp: November 27, 2014, 11:07:49 am
content: I can find the battens in my ceiling

author: simmiv
author_rank: Contributor
timestamp: November 27, 2014, 11:11:59 am
content: Even found a powerboard where the power surge resistor was overheating
Amp Clamp Query - Page 1
Forum section: electronics / testgear

author: Mad Mart
author_rank: Contributor
timestamp: November 26, 2014, 12:10:02 pm
content: I've went to my local garage this morning to take my car for a service & whilst I was ther I noticed an Amp clamp by a bin. I spoke with the owner about it and he said it wasn't working and was being thrown out. Long story short, I took it home and started to tear it down.I put some batteries in and turned it on but no display. When I took the back off I couldn't see anything that jumped out at me as being the problem.When I got to the LCD I just couldn't work out how the PCB connected to it. I've attached some pics in the hope that you guys can shed some light on it for me, being a newbie to EE.The connectors on the PCB...Rear of the LCD...You can't actually see it in the photo but there are connections along the bottom edge of the LCD...There is a piece of foam-like 3-ply material between the LCD and the PCB connections so I thought maybe the foam was some sort of conductor, but it isn't.

author: apelly
author_rank: Unknown
timestamp: November 26, 2014, 12:33:41 pm
content: The piece of foam in the 4th photo. It's a zebra strip. It conducts from the PCB to the glass. The glass will have transparent traces on it. You'll probably see them if you hold it at the right angle in some light. Can't remember what that's made of though.https://en.wikipedia.org/wiki/Elastomeric_connectorhttps://en.wikipedia.org/wiki/Transparent_conducting_film

author: Monkeh
author_rank: Super Contributor
timestamp: November 26, 2014, 12:33:50 pm
content: Yes, it is a conductor. That is an elastomeric connector, commonly referred to as a zebra strip.

author: Mad Mart
author_rank: Contributor
timestamp: November 26, 2014, 01:19:23 pm
content: Thanks guys. I thought it wasn't conducting because I wasn't getting a sound from my DMM when testing for continuity. But there is about 400-500 ohms resistance through the material.
MAGNUM 2000 & 2002 Soldering Station - Schematics Needed - Page 1
Forum section: electronics / testgear

author: LegoLegs
author_rank: Contributor
timestamp: November 26, 2014, 01:06:27 pm
content: I have a few old Magnum 2000 & 2002 soldering stations with different faults - Ideally I would like to repair a few of these by using the extra parts I have, however - I cannot track any service manuals or schematics on the web. I was hoping that someone on this forum might have a link to these documents or might be able to share them?Thanks :-)
i need some help about manual for an old multimeter i have. - Page 1
Forum section: electronics / testgear

author: vvvasso
author_rank: Newbie
timestamp: November 25, 2014, 08:21:09 pm
content: First of all, Hi to the community. I have a rere and old multimeter ICE Supertester 680R, it is Italian and in very good condition. Now, as I dont read Italian i dont understand s..t. So I thougth maybe someone here can help me with some kind of user manual in English (or Croatian, he he) couse every single manual out there (and beleave me i have my share of searching) is in Italian. I even downloaded one of them and then translated it with few tipes of translators, but you know how they mess up the words and places of word in text so i might have just guessed what word comes after another.Really guys, if you could save me I would be so greatfull...Couse this is a nice peace of history and its in mint condision with nothing thats missing, and now i practically salvaged it couse it allmost finished in a DUMPSTER.So thank you in advance,even for reading this.In attachment ill put a picture only of a device, without casing, cables...etc,etc,,

author: MartyD
author_rank: Regular Contributor
timestamp: November 25, 2014, 08:45:09 pm
content: Hi there!This unit was made from around 1969 to 1976 if I remember correctly and was sold in large quantity across europe. It reminds me a bit of the old Metex instruments we had here in germany.It needs a somewhat "oldshool" sort of battery for the ohms range, see attached photo. To zero the ohms range, you just short the probes and adjust the scale to "0" with the trim pot inside.And yea, that's all I know about it, but operation of this analog meter should be self-explaining.btw: google can translate the italian pdf for you.Good luck and all the bestMarty
Video: Calibrating a low bandwidth analog oscilloscope.  - Page 1
Forum section: electronics / testgear

author: w2aew
author_rank: Super Contributor
timestamp: November 25, 2014, 05:30:33 am
content: This is a topic that has requested very often. Note that I am not a metrologist, nor is my equipment traceable to national standards - I'm simply showing an example of the basic process used to calibrate a basic scope.

author: Vgkid
author_rank: Super Contributor
timestamp: November 25, 2014, 08:19:39 am
content: Thanks for the video.
Discount from TEquipment.net - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: November 25, 2014, 05:56:12 pm
content: NOTE: This message has been deleted by the forum moderator Simon for being against the forum rules and/or at the discretion of the moderator as being in the best interests of the forum community and the nature of the thread.If you believe this to be in error, please contact the moderator involved.An optional additional explanation is:
How Accurate is that 3.5 digit Multimeter? hand-measuring 6976 measurements - Page 1
Forum section: electronics / testgear

author: retiredcaps
author_rank: Super Contributor
timestamp: November 25, 2014, 02:54:58 am
content: I saw this a few days ago, but forgot to mention it until now.A quote from the blog below ..."However, I have covered the most useful ranges on the meters, by hand-measuring 6976 measurements – a painstaking operation that took more than a whole week of spare time."http://goughlui.com/2014/11/17/investigation-how-accurate-is-that-3-5-digit-multimeter/

author: AG6QR
author_rank: Frequent Contributor
timestamp: November 25, 2014, 04:07:53 am
content: Some of the cheapest meters will give varying results depending on their internal battery voltage. I've got one similar to that unbranded DT-830B, and as the battery voltage drops, it will give readings that are as much as 170% of the true voltage before it stops displaying anything. I reported this in the thread below.https://www.eevblog.com/forum/testgear/how-bad-can-a-cheap-multimeter-be/In fairness, it does display a little rectangle to indicate the battery is low, and the reading only varies about 1% off of the true voltage if you stop using the meter when the rectangle first appears. But the rectangle does not clearly say anything about a low battery, and the indicator is not documented in the meter's user manual (not than anyone would be reading the manual).There's more to a meter than its accuracy under ideal conditions.

author: Lightages
author_rank: Unknown
timestamp: November 25, 2014, 04:13:20 am
content: Thanks for the link. The results are interesting and not unexpected for me. This would be a good thread to show someone who wants to rely and brag about how they are just fine with a really cheap meter.
Info on BWD 430 oscilloscope - Page 1
Forum section: electronics / testgear

author: patchym
author_rank: Newbie
timestamp: November 21, 2014, 02:29:13 am
content: Hi All,first post and been searching the web without luck. Sharing the knowledge via the web is awesome.I have a BWD 430 scope that came out of a shed years ago and I finally thoughtit was time to have a look at it.I have an electrical trade background and have done a few other courses so know enough to get into trouble.Powers up but nothing appears on the tube and no crackling from the crt etc. Looks as though it's been modified and refurbished some.I cannot find a manual or service document schematic or even a picture on the web.I'm hoping to have better luck with this community.BTW Dave I love your eevblog you tube videos, they're a hootthanks patchym

author: barry14
author_rank: Regular Contributor
timestamp: November 22, 2014, 10:25:42 pm
content: You can try the following: Flip all of the trigger controls up. Set the trigger level control to AUTO. Set the sweep speed to 1 ms/div. Turn the intensity controls to maximum (I don't know why there are 2 but set both of them to maximum). Set Channel A to DC and 0.5 vol/div. If you see a trace try to center it with the A position control and the horizontal position control. Adjust the intensity if the trace is very bright. If you don't see a trace turn both controls through their whole ranges. If you still don't see a trace, then the scope needs repair.

author: firepower
author_rank: Regular Contributor
timestamp: November 23, 2014, 02:35:42 am
content: I also trying to find manual for BWD 539A , works but trigger drifts, locks in TV mode in some ranges.There is a BWD 539D manual online. If may be of some help.

author: harveyradar
author_rank: Contributor
timestamp: November 24, 2014, 09:52:51 am
content: Quote from: firepower on November 23, 2014, 02:35:42 amThe manual for the BWD 539A is found athttp://www.kevinchant.com/bwd.htmlHarv

author: firepower
author_rank: Regular Contributor
timestamp: November 24, 2014, 10:35:44 am
content: thanks very much Harv, I have searched google many times trying to find it. I did have original manual but lost it when moving house many times. Now I be able to fix and calibrate

author: patchym
author_rank: Newbie
timestamp: November 24, 2014, 11:14:20 pm
content: Quote from: barry14 on November 22, 2014, 10:25:42 pmThanks heaps for advice and replyhave tried all these and still no glow from the screen.What I really need is a schematic so I can check voltages from the power supply. This must be an unpopular scope as info is non-existant ?.This is a cramped little scope and very difficult to work on. Also I guess the HV is about 2 to 3kv so a little scary as well.If I have no success with info I think I'll buy a good 2nd hand analog scope. There are a few available for under $100 that would fit the bill.I just want to troubleshoot audio amps and circuits. mostly lowish freq. Still learning.thanks all who replied
BK Precision 2190D - Page 1
Forum section: electronics / testgear

author: raxpox
author_rank: Newbie
timestamp: September 15, 2014, 07:18:38 pm
content: Hey all,Has anyone heard of or used the BK Precision 2190D digital 100 MHz, 1 GSa/s scope? For $399 (US) list price, it sounds like a good deal.http://www.bkprecision.com/products/oscilloscopes/2190D-100-mhz-1-gsa-s-2-ch-digital-storage-oscilloscope.htmlIt looks a lot like the Sigilent SDS1102CML, which seems to be pretty good. I was just wondering if BK might have made some improvements that make it more a more compelling choice than the original OEM unit.Cheers!

author: thebigone
author_rank: Newbie
timestamp: November 24, 2014, 07:08:12 pm
content: Hi there,Have you found any additional information on this? I am also interested in the 2190D, but can't seem to find any reviews. (There are some good reviews of the Sigilent, which is nice to see).I can't seem to find any recommendations (or horror stories) about either model on this forum.Cheers
Help interpreting function generator specs. - Page 1
Forum section: electronics / testgear

author: Rene
author_rank: Regular Contributor
timestamp: November 22, 2014, 09:36:35 pm
content: Hello,Silly question from someone that is just getting into electronics….One of my Siglent SDG1025 function generator specifications states the following:125MSa/s sample rate, 14bit vertical resolution, 16Kpts wave lengthCould someone explain to me what these values mean? I think I can make up the meaning of some of the values but I would rather be sure than guessing.Thanks.

author: barry14
author_rank: Regular Contributor
timestamp: November 22, 2014, 10:08:34 pm
content: These specifications refer to the arbitrary waveform mode in which you can specify any waveform you want. To do this you select amplitude values (denoted as samples) of the waveform at equally spaced time intervals. The 125MSa/s (which stands for 125 million samples per second) is the maximum rate the generator can output the waveform samples. 14bit vertical resolution refers to the allowable range of values of the amplitude (with 14 bits the range is 16384 to 1). 16Kpts wave length is the maximum number of individual values in one cycle of your waveform (16000 points). In summary, the generator can output amplitude samples of your waveform at a maximum rate of 125 million samples per second with each sample having an amplitude resolution of 14 bits and with each cycle having 16000 individual samples before the cycle repeats.

author: Rene
author_rank: Regular Contributor
timestamp: November 23, 2014, 08:05:32 pm
content: Thanks Barry,Your answer helped me confirm what I thought those values represented. After your remark regarding that the specification are related to the arbitrary waveform mode, I installed the software that is used to create arbitrary waveform and I see the that the software always breaks the waveform into 16000 horizontal points. That put the16Kpts wave lengthspecification into perspective really nicely.I do have a followup question though. In your reply, you said that all those specification referred to the arbitrary waveform and I am wondering if you really meant to say that or if it was a typo. In other words, are the specifications really just for arbitrary waveforms or do the specifications also relate to the built in standard function such as Sine, Square, Ramp, Pulse and Noise? After all, aren't the built in functions basically pre-built arbitrary function?Thanks.

author: w2aew
author_rank: Super Contributor
timestamp: November 24, 2014, 01:22:19 am
content: Quote from: Rene on November 23, 2014, 08:05:32 pmThe standard waveforms are likely generated by the same hardware, using built-in or numerically generated waveform samples (as opposed to using analog waveform generation circuits).
E4432B Sig Gen Frequency Extension - Page 1
Forum section: electronics / testgear

author: nouserid
author_rank: Contributor
timestamp: November 23, 2014, 05:31:12 am
content: Hi,The E4432B signal generator has the upper frequency limit of 3 GHz. However, according to service manual, it has the capability of generating 4 GHz internally. I gather the software is limiting its upper operating frequency. Hence, I would like to have some insights on modifying it to 4 GHz. Thanks in advance.Cheers,Henry
Tek 2465B Repair - Page 1
Forum section: electronics / testgear

author: avvidclif
author_rank: Regular Contributor
timestamp: November 21, 2014, 03:14:15 am
content: I think my 2465B got jealous. My new Rigol arrived Tuesday. I played with it for about an hour before shutting down. Today my 2465B got jealous and threw a snit fit. When turned on the trace didn't appear as it normally does. Brightness was at the normal 10 o'clock position. The readout is normal, just no trace unless turned all the way up and then it's dim. The beam finder works.Any ideas or the name of a good Tek repair place? I fix 2-way radios, not the equipment I use to fix them.

author: tautech
author_rank: Super Contributor
timestamp: November 21, 2014, 03:33:03 am
content: QuoteThe fact that the CRT is the problem and not the calibrated scope circuitry should not frighten you from doing the repair yourself.Put a country flag in your profile for local reccomdations.Have look at the first link in the first thread in the Repair board....a troubleshooting guide written by Tek.Get the correct service manual and read carefully.Many Tek scopes of that era require additional cooling with the covers off.

author: Radio Tech
author_rank: Frequent Contributor
timestamp: November 21, 2014, 11:55:03 am
content: I agree with tautech.Bet it is just a bad cap gone leaky.I felt the same way you did. I repair radio for many years, now I work on all my test gear from signal gens(IRF 1200, HP8640b) to scopes. I never done that until I found this forum and spent time here.Plus I know of you and your work. You have the knowledge to do it.Then if radio work drops off you have something else in your arsenal to fall back on…….

author: grumpydoc
author_rank: Super Contributor
timestamp: November 21, 2014, 01:37:02 pm
content: QuoteActually it probably isnt, given that the readouts weren't affected.The description makes me think triggering might be the problem.

author: avvidclif
author_rank: Regular Contributor
timestamp: November 21, 2014, 11:07:07 pm
content: This morning it started up and worked perfectly.?

author: johansen
author_rank: Super Contributor
timestamp: November 21, 2014, 11:10:58 pm
content: do you have a heatsink on u800?

author: avvidclif
author_rank: Regular Contributor
timestamp: November 22, 2014, 01:32:11 am
content: April of last year it was rebuilt at ScopeTechniques. It has been doing fine. I checked and he's still off on another tangent and not repairing scopes any more. He changed out the novram, caps, resistors, and all the usual stuff related to problems on that board. Prior to that it had less than 100 starts on a factory rebuild. It should be OK on the heatsink.I guess if it does it again I'll look deeper.
Massdrop Rigol1052E, 1102E and 1054Z - Page 1
Forum section: electronics / testgear

author: 1994timmeh
author_rank: Contributor
timestamp: November 23, 2014, 09:27:23 am
content: Hi guys!So Dave seems to love these scopes (best value for money around) but what if we could get them that little bit cheaper?Massdrop is a website where you can group buy direct from the manufacturer (i do not work for them. A few guys from University in Australia need scopes so we thought this would be an easy way to buy them together). So the way it works is people vote on items (the 3 scopes) and if an item gets 200 votes mass drop will organise with the manufacturer to get them at a good price! Win win for everyone! So dro.ps/v/7wInIjA is the link to vote for any one of the 3 scopes (or add others that might be good).Cheers guys!

author: firepower
author_rank: Regular Contributor
timestamp: November 23, 2014, 02:07:57 pm
content: There is the link abovedro.ps/v/7wInIjAHow about adding Tekway DSO5072P it hackable to 200MHzhttp://www.hantek.com/en/ProductDetail_26.html

author: David_AVD
author_rank: Super Contributor
timestamp: November 23, 2014, 08:20:56 pm
content: But you'd lose the support of the local (to you) agent by doing this?

author: 1994timmeh
author_rank: Contributor
timestamp: November 24, 2014, 11:05:49 pm
content: Yeah @David_AVD thats my worry! However i can't find anyone who stock these scopes in Australia, If anyone knows where they are id love to hear it

author: skennedy
author_rank: Contributor
timestamp: November 24, 2014, 11:14:48 pm
content: Emona stock them. Not sure that they have any in stock but you can always ask!http://www.emona.com.au/products/electronic-test-measure/oscilloscopes/ds1054z.html#.VHO7v5XQp8E

author: David_AVD
author_rank: Super Contributor
timestamp: November 24, 2014, 11:16:02 pm
content: EmonaandEYOUcome up in a Google search.

author: 1994timmeh
author_rank: Contributor
timestamp: November 24, 2014, 11:49:49 pm
content: haha crap diddnt even know Emona was AustralianJust assumed they were overseas!You're a legend mate!

author: ivan747
author_rank: Super Contributor
timestamp: November 25, 2014, 12:45:57 am
content: What sort of price do you expect we can get?

author: 1994timmeh
author_rank: Contributor
timestamp: November 25, 2014, 01:39:38 am
content: Ive used mass drop a few times before and usually they can get a reasonable price cut depending on how nice the manufacturer is feeling. Ive seen sets of speakers (RRP US$300+) go for less than US$200. Also the shipping is usually very reasonable! Its really just a matter of first getting 200 votes to say the community want this deal to go ahead. Then depending on how many people take up the offer really determines the end price

author: EEVblog
author_rank: Unknown
timestamp: November 25, 2014, 02:03:27 am
content: Quote from: 1994timmeh on November 24, 2014, 11:05:49 pmEmona are selling them like hot cakes.

author: 1994timmeh
author_rank: Contributor
timestamp: November 25, 2014, 07:32:05 am
content: Cheers Dave! I just noticed that! Time to man up and buy one!
Impedance matching/translation using 54100A probes with a modern scope - Page 1
Forum section: electronics / testgear

author: jstkatz
author_rank: Newbie
timestamp: November 21, 2014, 02:46:57 am
content: I came into four or five 54001A 1 GHz, 2pf miniature active probe kits that appear entirely unused. Of course they use an odd pod amplifier that sockets into the 54100 series oscilloscope body and seem to make them useless without some work.The miniature probes they come with are awesome, very small, very flexible leads. My find also came with a 54003-61617 more or less standard 10:1 probe with BNC and I quickly switched to using it over the probes that came with the DSOX 3014A, its getting a little dicky now and I've had plenty of times were I would have likes to use the other probes as well.I wouldn't mind figuring out how to get the active probe working as an active probe but that seems like more of a project. Also, I've been unable to find a pinout for the 6 additional conductors on the back of the pod.I'm wondering if its possible and what it would take to use the probe tip and cable with a my scope? The probe has a 10K resistor between the tip and the coax, the coax does not have any appreciable DC resistance but that's about all I know about it, the probe pod also lists it as a 2pf probe. The connectorized end has a small threaded coax fitting I don't recognize, I could lop that off and solder on a bnc or salvage the mating connector from the pod but I imagine I need a network of some sort to match up the 10K probe and the 1M or 50ohm input on the scope.It would also be nice to be able to modify it only at the connector end because the probe is so small and nice.I've looked a round a bit but yet to see something much like this, perhaps because its not a good idea or perhaps because I dont know where to look, suggestions?

author: rf-loop
author_rank: Super Contributor
timestamp: November 21, 2014, 07:06:39 am
content: http://literature.cdn.keysight.com/litweb/pdf/54100-90913.pdf(before download it may ask your some email and some name)Page 7A-19 and 7A-20(Probe) Schematics and connector pins and also there can find probe test/adjust procedure..These probes can use with 54100A/D series scopes some models and with 54300A 16x probe multiplexer what can cascade for "enough" amount of probes.To find this all information need 127 seconds with google and former HP - former Agilent - Keysight side.(in Keysight search do not write model number letters HP)And with this probe, it do not give anything but finding first scopes where is is used... this make trick.
GW/Instek OEM Brands They Were Sold Under - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: November 20, 2014, 02:38:03 am
content: Here, they've sold under Tenma, Elenco, and to lesser degrees others such as Beckman Industrial and some B&K items that I know of. Some of the 3rd party brands include good documentation whereas the products sold under GW/Instek brand often are no more then a few pages of operational and specifications. They don't seem to have service literature available nor do they offer service. Even with the re-brands, once you bought it, best they would do is offer a replacement if available.What brands were they sold under outside of the US?

author: videobruce
author_rank: Frequent Contributor
timestamp: November 20, 2014, 03:32:27 am
content: You can't get service literature for Rigol either. Seems to be the norm (if you can call it that) for these Chinese outfits wanting to pawn they stuff abroad.

author: coppice
author_rank: Super Contributor
timestamp: November 20, 2014, 03:52:19 am
content: Quote from: videobruce on November 20, 2014, 03:32:27 amGW/Instek isn't Chinese. They are Taiwanese.

author: videobruce
author_rank: Frequent Contributor
timestamp: November 20, 2014, 09:25:57 pm
content: http://www.usc.edu/dept/TSA/faq.htmlQuoteNot according to that. But, one way or the other, it's splitting hairs.

author: coppice
author_rank: Super Contributor
timestamp: November 20, 2014, 11:26:04 pm
content: Quote from: videobruce on November 20, 2014, 09:25:57 pmTaiwan and China are places at very different points in their development. To conflate them would make no sense from an engineering or business point of view, even if Taiwan were actually a province within China.

author: Unknown
author_rank: Unknown
timestamp: November 20, 2014, 11:58:34 pm
content: some re-badged as iso-tech in the uk.

author: Hydrawerk
author_rank: Super Contributor
timestamp: November 21, 2014, 12:18:52 am
content: Some Voltcraft instrumnets in Germany and overall Europe.
Any experience with Uni-T UTP3704? - Page 1
Forum section: electronics / testgear

author: congia
author_rank: Contributor
timestamp: November 19, 2014, 03:22:49 pm
content: Hey guys, I'm thinking of getting a power supply. Steering clear of the Yihua stuff from eBay, HP/Agilent/Keysight products are quite expensive ($1000+) on eBay Australia.Mektronics is selling the Uni-T UTP3704. I have never bought anything from them before but they seem to stock a lot of the high-end soldering accessories Dave raved about in his videos. Not sure if that's relevant but their website seems professional enough to be trustworthy.Has anyone had any experience with Uni-T bench power supplies in general and the UTP3704 in particular?Cheers

author: Wytnucls
author_rank: Super Contributor
timestamp: November 19, 2014, 05:10:03 pm
content: Not sure if they're any good, but I know that UNI-T were not happy with their previous supplier. I don't know which company makes the latest ones, but the new models have changed quite a bit and the range has been reduced drastically (6).Here is the latest UTP3704S:http://www.uni-trend.com.cn/en/product/2014_0725_704.html
Array 3711A   -  At what point do fans turn on? - Page 1
Forum section: electronics / testgear

author: K1JOS
author_rank: Regular Contributor
timestamp: November 20, 2014, 03:08:23 am
content: I just got an Array 3711A and while getting familiar I noticed the fans were not on. Not being sure if this is a defective unit, I am feeding it with 10vdc @ 2 A (20W) from my Rigol DP832 and after 10 mins still no fan. I never had an electronic load and don't want to stress it if there is a fan problem. Can anyone with the 3711A or one of the similar OEM tell me how their fan works?thanks

author: Rufus
author_rank: Super Contributor
timestamp: November 20, 2014, 04:06:28 am
content: Quote from: K1JOS on November 20, 2014, 03:08:23 amThe fans in these loads are temperature controlled. 20W into a 300W load will probably never get the heatsink temperature high enough for the fan to turn on.

author: K1JOS
author_rank: Regular Contributor
timestamp: November 20, 2014, 04:19:29 am
content: Thanks, i am such a wimp. I now got it almost up to 90W and after a minute or so the fans came on full force. I just wanted to be sure if I needed to get a replacement.
53230A counter CH1 input trace fails!? - Page 1
Forum section: electronics / testgear

author: awallin
author_rank: Frequent Contributor
timestamp: November 19, 2014, 06:27:28 pm
content: We just had the second failure of this kind:53230A counter CH1 input just stops working all of a sudden. Inspection of the board reveals a thin trace just after the input-BNC that is broken. The fix is to add a wire from the input-BNC to the next smd-pad which happens to be unpopulated.Anyone seen this before on the 53230A or its sister models? We have one more 100ps version and maybe a third 20ps - I'm now almost expecting them to fail in the same way since two units have already shown thisChemical corrosion? Mechanical stress from the BNC? Other ideas?Anders

author: SeanB
author_rank: Super Contributor
timestamp: November 19, 2014, 06:35:36 pm
content: Probably the inner pin flexing as connectors are mated and disconnected. The stress is transmitted to the board. Nice fix with the wire, though I would have used a thin strip of foil to provide a more compliant connection with low inductance.

author: free_electron
author_rank: Super Contributor
timestamp: November 19, 2014, 08:37:56 pm
content: how much power are you blasting in that thing ? that's a fusable trace ..
are builders-equipment.com and constructionswarehouse.com legit? - Page 1
Forum section: electronics / testgear

author: ixfd64
author_rank: Frequent Contributor
timestamp: November 20, 2014, 08:44:39 pm
content: I found two apparently related websites offering used test equipment:http://builders-equipment.comhttp://constructionswarehouse.comSome of them seem to be very good deals, with far lower prices than on eBay. For example:Agilent MSO6104A for $4,309(list price $22,895)Anritsu MS2721B for $2,729(list price $13,950)FLIR B400 for $1,925(list price $13,495)However, I'm also seeing a few red flags:1. The prices alone make them seem too good to be true.2. The company is sellinghacked FLIR E4's. This strikes me as pretty unprofessional.3. There is also alistingfor a FLIR camera that mentions three different models (T300, T360 and T400) but doesn't clarify which one it is. What's even more suspect is that the listing says the camera is calibrated up to 2,000 °C, whereas FLIR doesn't offer that high of a temperature range except on the very high-end cameras.So does anyone know if this company is legit?

author: ixfd64
author_rank: Frequent Contributor
timestamp: November 21, 2014, 12:31:09 am
content: I've done some more research, and they do appear to be scams. Another red flag is that they do not accept PayPal or credit card. So you should probablynotbuy from these sites.

author: edavid
author_rank: Super Contributor
timestamp: November 21, 2014, 02:19:50 am
content: Constructions WarehouseJl.Kesehatan Raya No.7 BintaroJakarta Selatan 12330,Indonesia
Old Muirhead resistance box tear-down and clean-up - Page 1
Forum section: electronics / testgear

author: anachrocomputer
author_rank: Regular Contributor
timestamp: November 17, 2014, 01:24:02 pm
content: I've written (on my blog) about an old Muirhead resistance box that I found in a car boot sale recently. It was quite grimy, and needed a clean-up. While doing that, I took some photos of the fine old Bakelite-and-brass switches. Note the non-inductively wound resistors, too.http://anachrocomputer.blogspot.co.uk/2014/11/muirhead-resistance-box.htmlMore photos of the clean-up are on Flickr, here:https://www.flickr.com/photos/anachrocomputer/sets/72157648869472448

author: Vgkid
author_rank: Super Contributor
timestamp: November 17, 2014, 03:01:28 pm
content: Good job on the clean up.
Tek 2430 manual - Page 1
Forum section: electronics / testgear

author: sebajom
author_rank: Contributor
timestamp: November 17, 2014, 09:57:35 pm
content: I have a Tek 2430 (not the 2430A) in good shape. Love the scope, but I'm lacking the operator's manual to clear up a few of the finer details about it.Tek's website has the service manual and what they claim to be the "user manual" for download. The latter is NOT actually the full user manual, but a 27-page quick start guide which basically names the buttons and a few menus, and frequently refers to pages in the "operator's manual".http://www.tek.com/oscilloscope/2430-manual/2430-manual/2430The 2430A, on the other hand, has the full manual available at tek.com, but that scope has some significant differences, so I'd prefer the correct one.Does anyone know if the full 2430 operator's manual is available for download anywhere?

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 17, 2014, 10:39:38 pm
content: Yeah, that wasn't easyhttps://www.ntecusa.com/docs/TEK%202430%20Digital%20Oscilloscope%20Operators%20&%20Concepts.pdf

author: sebajom
author_rank: Contributor
timestamp: November 17, 2014, 11:18:55 pm
content: Fantastic! Thank you very much.
Question about edge trigger - Page 1
Forum section: electronics / testgear

author: asmd
author_rank: Newbie
timestamp: November 19, 2014, 02:00:51 am
content: I recently got a Rigol DS1054Z oscilloscope, have been playing with it, and I've noticed that when triggering on a rising edge I can't seem to be able to trigger on the bottom part of the signal. On the 1KHz 3V test signal the lowest threshold that will fire the trigger is 320mV, and setting the trigger lower will leave the signal untriggered. Is this normal?

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 19, 2014, 02:45:22 am
content: There's a certain dead band where it won't trigger, to prevent false triggering on noisy signals.Exactly how this is implemented depends on the scope. Back in the day, it might've simply been the AC gain of the trigger circuit, or hysteresis / deadband (especially in "noise reject" mode, if present); in digital scopes it's probably either analog filtering or hysteresis again, or something similar but implemented digitally (hysteresis implemented by comparing samples rather than voltage levels, but same idea). Digital triggering may also incorporate features like "high res" mode, where frequencies not visible on screen are explicitly filtered out of the measurement. Whatever it is, reading the manual should provide some insight.Tim
Looking to get a IC Tester - Page 1
Forum section: electronics / testgear

author: Zithen
author_rank: Newbie
timestamp: November 17, 2014, 05:05:35 am
content: Honestly I am not to sure where to even start with finding one that would fit what I need.I have gotten a few non working arcade boards (Ms.Pacman) from a friend and a working one for reference to get me into electronics since I have always found it kind of interesting and wanting to learn it more.Don't know if the type of ICs matter, but there are a lot of LS245, LS247, LS393 and so on. Would like to find one with a in-circuit testing option, if that is possible. I am learning to use a logic probe at the same time with it so would be nice to think I found something with the logic probe then be able to test the IC without having to take it out of the board.Any advice, pointers, video or what not would greatly be appreciated.

author: FrankBuss
author_rank: Unknown
timestamp: November 17, 2014, 05:35:55 am
content: Usually it is not possible to fully test it in-cicuit. But for most 74xx(x) ICs all you need is a 2-channel oscilloscope and the datasheet of the IC. For more complicated applications, or faster testing, a scope like the DS1052D with 16 additional digital inputs would be perfect. But always good to have some analog inputs as well for trouble shooting, to see if there is too much noise on a supply rail, or bus contention on logic signals etc.

author: netdudeuk
author_rank: Frequent Contributor
timestamp: November 17, 2014, 09:46:07 am
content: Look for the arcadeuk channel on YouTube for a load of great arcade PCB repairs.