hybridfree/eevblog-posts huggingface dataset:
Picked up an SDS1104X-E today - Page 1
Forum section: electronics / testgear

author: cburgess129
author_rank: Newbie
timestamp: December 01, 2019, 10:17:28 pm
content: After a year of watching EEVBLOG reviews and cruising the forums I broke down and bought an SDS1104X-E today. Circuitspecialists.com has a 15%-off black friday coupon code today that brought the price down to $424 with no taxes and free shipping!I waffled back and forth between the DS1054z, SDS1202X-E and this model for a long time. In the end I wanted a 4-channel scope but didn't want to spend an extra $150 over the Rigol but I also didn't want to have to have to hack it either. I ended up spending an extra $75 (probably less because of no taxes) for the peace of mind and slightly higher-specs of the Siglent. If they had the DS1054Z in-stock it would have made for a very hard decision because it would have been so cheap.Thanks Dave, and everybody else on the forums who helped me make the decision!

author: BillB
author_rank: Unknown
timestamp: December 01, 2019, 10:55:54 pm
content: Congrats!That a good deal from Circuit Specialists. I've purchase a good bit of stuff from them in the past. Very nice folks.

author: cburgess129
author_rank: Newbie
timestamp: December 01, 2019, 11:17:12 pm
content: Yeah, I just kind of stumbled across the deal while following something down a rabbit hole on this very forum. I saw a post from someone that mentioned CS had a good price on another scope so I went to check them out and saw the sale. Just dumb luck.I am excited to try the new scope out when it gets here. I already made a place for it in the lab!I have a Tek 2440 300mhz scope that I bought on ebay last year as a sort of stop-gap until I picked up a DSO, but man I can't wait to play with the Siglent.Chris

author: BillB
author_rank: Unknown
timestamp: December 01, 2019, 11:29:46 pm
content: These new low-cost DSO's have a remarkable amount of functionality for the money, and quite a bit of difference from the 2440. Plus, even though you mentioned not wanting to hack the Rigol, I'm sure you've seen the threads discussing how the Siglent can be hacked too to get to 200MHz.It's a neat little scope, I'm sure you'll have fun with it.

author: cburgess129
author_rank: Newbie
timestamp: December 01, 2019, 11:50:38 pm
content: I have seen some stuff about hacking the Siglent on here and I will probably play around with it eventually. Having a quality 200mhz 4-channel scope for the price I paid would be fantastic.
Yokogawa_TYPE_2553_DC_Voltage_Standard - Page 1
Forum section: electronics / testgear

author: Ketema
author_rank: Newbie
timestamp: December 06, 2019, 04:57:10 pm
content: Hello everyone,Can anyone who has account at KO4BB Manuals upload the following document?Yokogawa_TYPE_2553_DC_Voltage_StandardPlease get the manual here:https://drive.google.com/file/d/1RF8HwxKORLdFEPKIGLOukznf7EvtNdxK/view?usp=sharingThank you.

author: Kosmic
author_rank: Super Contributor
timestamp: December 06, 2019, 09:10:50 pm
content: you don't need a accountread the instructionshttp://www.ko4bb.com/getsimple/index.php?id=upload-instructionsand then upload here :http://www.ko4bb.com/cgi-bin/upload.plL/P are on the instruction page.
Uphacking Infinium HP54845A to HP54846A - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: December 01, 2019, 02:25:30 pm
content: Does any one know the resistor combinations needed on R1 - R4 to uphack the HP54845A to HP54846A?Thanks

author: nctnico
author_rank: Super Contributor
timestamp: December 01, 2019, 02:35:51 pm
content: I've tried but failed. AFAIK the '846A has different input attenuator modules.

author: AJ3G
author_rank: Regular Contributor
timestamp: December 01, 2019, 03:00:12 pm
content: Ok thanks, that would make sense based on some observations I have made regarding B/W of the 845A.Rich
£40 multimeter with oscilloscope  - Page 1
Forum section: electronics / testgear

author: buzzybee191@gmail.com
author_rank: Newbie
timestamp: November 30, 2019, 09:41:13 am
content: I have found this £40 multimeter that also has an oscilloscope function.Is it worth getting. It would be nice if Dave did a review on it.https://www.banggood.com/MUSTOOL-MT8206-2-in-1-Intelligent-Digital-Oscilloscope-Multimeter-with-Analog-Bar-Graph-p-1331666.html?rmmds=search&cur_warehouse=UK&p=K6282137007969201907&custlinkid=709573

author: Fungus
author_rank: Super Contributor
timestamp: November 30, 2019, 10:17:54 am
content: If 10kHz bandwidth is enough for you then, sure.

author: tunk
author_rank: Super Contributor
timestamp: November 30, 2019, 01:25:09 pm
content: Here's a review:https://lygte-info.dk/review/DMMMustool%20MT8206%20UK.html

author: Gyro
author_rank: Super Contributor
timestamp: November 30, 2019, 01:55:22 pm
content: Hmm, not what I'd call a useful scope function, the resolution is very poor.
How do bed-of-nails/ICT testers check parallel components? - Page 1
Forum section: electronics / testgear

author: mjt
author_rank: Unknown
timestamp: November 29, 2019, 01:56:45 pm
content: Hi all,I'm trying to learn more about testing printed circuit boards during/after manufacture. I know that, alongside things like Automated Optical Inspection, some manufacturers use bed-of-nails testing, which can detect some errors that AOI wouldn't be able to detect, like incorrect values on unmarked components.What I can't understand is how bed-of-nails testing can robustly check components that are in parallel - for example, the traditional decoupling arrangement of small ceramic capacitors in parallel with a large electrolytic one (and everything else on the supply rail).For example, if I was testing an Arduino Uno 5v rail which has a 47μF capacitor, a 100nF capacitor and an ATMEGA328P all in parallel, would an ICT tester be able to detect a wrong value on the 100nF capacitor? If so, how would it detect that?Thanks!

author: Fungus
author_rank: Super Contributor
timestamp: November 29, 2019, 03:53:18 pm
content: Quote from: mjt on November 29, 2019, 01:56:45 pmAll the components are there for a reason. When you see two capacitors in parallel it's usually so that they work well at all frequencies.If you test at the frequency that the 100nF capacitor is supposed to cover then you can isolate it.

author: ejeffrey
author_rank: Super Contributor
timestamp: November 29, 2019, 04:21:16 pm
content: More generally, measure S11 vs frequency and compare to a known good board.

author: joeqsmith
author_rank: Super Contributor
timestamp: November 29, 2019, 05:09:01 pm
content: I still have an original copy of this book on my shelf. Sorry, I'm not much help but it's an interesting topic.https://www.ietlabs.com/pdf/Handbooks/Introduction%20to%20In-Circuit%20Testing.pdf
Oscilloscope probes and high voltages (upto about 500v) - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: November 29, 2019, 01:40:05 pm
content: I use a large isolation transformer which plugs into a bulb current limiter and then a variac when necessary.If I want to check high voltage lines I usually discharge, attach a lead and switch on so that I am ultra safe. However there are times when I want to check live items VERY CAREFULLYI have seen people using standard probes but would rather be safe than sorry. Should I get high voltage probes? Do I need differential probes with my setup? What is safe? I understand the earth potential issue but I work earth isolated.

author: tggzzz
author_rank: Super Contributor
timestamp: November 29, 2019, 01:54:18 pm
content: Quote from: cowasaki on November 29, 2019, 01:40:05 pmHow, exactly, do you completely isolate yourself from the earth?Be aware that isolation transformers are not a panacea; you can still kill yourself because you are using it incorrectly, or even if you are using it correctly. Ditto RCD/GFCI.Apart from that, I'm not prepared to give off-the-cuff advice on a topic like this. There's too much chance I might forget something, I might explain it poorly, you might misunderstand, you might do something I hadn't anticipated...The references inhttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/might be of some help.

author: PKTKS
author_rank: Super Contributor
timestamp: November 29, 2019, 02:10:35 pm
content: Quote from: cowasaki on November 29, 2019, 01:40:05 pmSo do I but my bulbs are "after" the VARIAC.My order for the DUT is: transformer (which is a 110 to 220) + 220VAC VARIAC + BULB(s)AND ALL MY INSTRUMENTS HAVE DEDICATED ISOLATED TRANSFORMERS.Yes they are floatingand yes I am aware of the risks and implicationsQuote from: cowasaki on November 29, 2019, 01:40:05 pmYes - YOU **SHOULD** get at least a 100x probe for anything rated above 200VThat will raise your input impedance quite enough to protect your scope inputWILL NOT RELIEF YOU TO THINK **VERY VERY CAREFULLY** WHERE TOFIT YOUR ALLIGATOR "GND"Remember that this clip is the "GND" of your scope...So when dealing with ISOLATED networks you mayconnect these points safely whit no worries about realground or line shortsYOUR SAFETY IS AS GOOD AS ALWAYS. USE PROTECTIVE GLOVESanything above 100 may cause some panic risking hard movements.Fix the bench gig and touch with gloves.Good and cheap enough for anything real lifebut not StarTrek like based equip.Paul
what is "Measurement update rate"? - Page 1
Forum section: electronics / testgear

author: oldaaron
author_rank: Newbie
timestamp: November 24, 2019, 04:51:08 pm
content: In keysight Infiniium series devices , there is a metric "Measurement update rate" as follows:But there arn't any resources explain what the metric is and if I can use the metric estimate my measurement speed. Can anyone give some information about this metric?Thanks.

author: DaJMasta
author_rank: Super Contributor
timestamp: November 24, 2019, 07:51:00 pm
content: How many times a second the on screen numeric measurements (Vpp, frequency, Vmax, period, etc.) are updated.Your scope captures the waveform and the rate at which it can get it on the screen (blended, since there's limited screen refresh rate) is the waveform updates per second, this is the same idea, but it's the speed the instrument can measure whatever parameter from the waveform and then update that number instead. The reason it goes up for multiple displayed measurements is that the instrument can do several in parallel, but the number is the total number of measurement updates, so each of the ten measurement can only be updated 25,000 times a second.Seems pretty fast to me.

author: Someone
author_rank: Super Contributor
timestamp: November 24, 2019, 09:58:56 pm
content: It is of interest when collecting histograms/limits/statistics on measurements, but as you have noted there is little to tell you under what conditions that will occur. Does your signal have enough measurement events to even push those limits?

author: oldaaron
author_rank: Newbie
timestamp: November 25, 2019, 04:26:30 pm
content: Quote from: Someone on November 24, 2019, 09:58:56 pmThat's what I think wired. It seems that the update rate of infiniium is slow. I find the update rate of the devices is less than 1000. There is no way making the device responde to so much events .

author: Someone
author_rank: Super Contributor
timestamp: November 25, 2019, 10:17:47 pm
content: Quote from: oldaaron on November 25, 2019, 04:26:30 pmIt makes measurements across the whole window, if there are multiple periods it will update period/frequency with multiple values. You can see this in the video on jitter analysis:While the update rate of the display is relatively slow, the update rate of measurement data can be much higher.

author: oldaaron
author_rank: Newbie
timestamp: November 28, 2019, 03:50:02 pm
content: Thanks for your information.
PRoblem to boot the Oscilloscope DSO-X2014  - Page 1
Forum section: electronics / testgear

author: jmarcelo
author_rank: Newbie
timestamp: November 28, 2019, 02:44:05 pm
content: Hello,We have a problem with the oscope. When I turning it on, the scope does not boot up.We can see the 3 leds turned on, but it stopped on the "serial" LED, with the black screen.We have already checked the battery inside the scope, It seens right with 2.9V.Do you have any ideia to check this problem? I could not find the power supply schematics.Sincerely,

author: Pinkus
author_rank: Frequent Contributor
timestamp: November 28, 2019, 02:53:05 pm
content: Sounds like NAND corruption.There are several threads here. e.g. here:https://www.eevblog.com/forum/testgear/keysight-msox3104t-start-up-problem!/
Anyone has esperience with pyVISA-sim ? - Page 1
Forum section: electronics / testgear

author: tramax73
author_rank: Newbie
timestamp: December 02, 2019, 10:41:15 am
content: Hi guyshave seen different posts dealing with pyVISA but none of them specifically referring to its simulator backend.Has anyone experience with it ?I'd like to modify an excel sheet with embedded VBA code that automates some instrument testing (via NI-Visa or Keysight IO-Libraries VISA) and do like to understand if I can do some debugging to a "virtual instrument" (I think writing a simple backend should be quite quick and easy) using it.Will try to get in touch with the developers too.TIA & bYE
Feed-Thru Terminators - kinda pricey but free shipping  - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: November 27, 2019, 06:50:00 am
content: https://www.ebay.com/itm/Set-of-Three-Tektronix-011-0049-01-50-Ohm-2-Watt-BNC-Feed-Thru-Termination/283588336167?epid=1600623857&hash=item42072e9a27:g:67sAAOSwSkhdXiCW:sc:USPSFirstClass!75075!US!-1

author: bob91343
author_rank: Super Contributor
timestamp: November 27, 2019, 06:59:25 am
content: Well the shipping is free so you can save money that way.
This is no way to treat a Heathkit! - Page 1
Forum section: electronics / testgear

author: Martin Hodge
author_rank: Unknown
timestamp: November 05, 2019, 02:32:26 am
content: Don't know what I'm going to do with This

author: schmitt trigger
author_rank: Super Contributor
timestamp: November 05, 2019, 03:15:21 am
content: It gives you a heavy heart similar to watching a photo of a neglected puppy or kitten.....

author: CatalinaWOW
author_rank: Super Contributor
timestamp: November 05, 2019, 03:47:01 am
content: If it hadn't been treated that way you might well be missing some zeros in your wallet. This one looks like it will mostly clean up with some TLC.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: November 05, 2019, 04:22:47 am
content: Heh, nice. I have one, or one very similar (IO-103 I believe? can't make out the number in the pic, it's just a blur..). Yeah, if there aren't a lot of corroded-off components, it's probably fine. Wash everything, scrape off the rust and crud, give it a good clear coat or re-galvanize or something to stave off further corrosion, and it's probably okay.Think the first-ish thing I did with mine is replace the old electrolytics, and maybe there were some bum tantalums or transistors or diodes in there too. Last thing I was doing I think, upgrading the deflection amps for more bandwidth; you can salvage relevant transistors from old high-res CRT monitors, and typical circuits can be found in Tektronix manuals of various age.Tim

author: james_s
author_rank: Super Contributor
timestamp: November 05, 2019, 04:37:04 am
content: I had a scope that looked just like that many years ago, mine was branded Bell & Howell. One of the HV capacitors in mine was bad.

author: Martin Hodge
author_rank: Unknown
timestamp: November 05, 2019, 05:17:23 am
content: It's an IO-102

author: med6753
author_rank: Super Contributor
timestamp: November 05, 2019, 03:26:38 pm
content: It can be brought back from the brink. But mine wasn't as bad as yours.

author: Martin Hodge
author_rank: Unknown
timestamp: November 26, 2019, 09:29:43 pm
content: For gits-n-shiggles I put it on Ebay for $0.99. Some mouthbreather actually took the time to send me this...

author: Stray Electron
author_rank: Super Contributor
timestamp: November 26, 2019, 09:57:39 pm
content: I've seen worse on e-bay! For $.99, it's well worth it just for the knobs and other frequently missing pieces. Maybe Sicko would be happier if you just listed each knob separately on E-bay for $19.95 plus shipping and handling the way that many sellers do.
HP 4285A "CORR DATA CSUM ERROR"  boot message - Page 1
Forum section: electronics / testgear

author: rhb
author_rank: Super Contributor
timestamp: November 26, 2019, 06:48:41 pm
content: I just received a 4285A from ebay and at power up it displays the message in the subject line.Does anyone know anything about it? I've queried the HPAK list on groups.io and gone through all manuals without learning anything useful. I surmise it's a NVRAM battery failure, but locating the part is a bit of a challenge as there are no components visible when you take the skins off. So considerable disassembly is required to play hunt the wumpus. I've not been able to find a service manual with component level data.From the manuals I've read a short-open-load kit is used to generate the lost coefficients. That is listed in the maintenance manual as HP 16342A, though there seem to be others.Reg
Rigol DS1054Z on Clearance - Page 1
Forum section: electronics / testgear

author: gobo207
author_rank: Contributor
timestamp: November 24, 2019, 11:28:38 pm
content: Morning all,I have been scoping this scope for a while now, and just saw TEquipment have listed the price as "Clearance".https://www.tequipment.net/Rigol/DS1054Z/Digital-Oscilloscopes/?v=7401Anyone know of any new release news?

author: MarkF
author_rank: Super Contributor
timestamp: November 25, 2019, 01:19:01 pm
content: The 6% EEVBlog discount is better than their 3% clearance if you are looking to buy.

author: Fungus
author_rank: Super Contributor
timestamp: November 25, 2019, 02:03:23 pm
content: Quote from: MarkF on November 25, 2019, 01:19:01 pmYes, but do you know of any release news?

author: nctnico
author_rank: Super Contributor
timestamp: November 25, 2019, 03:02:23 pm
content: Nahhh. This is just another so called 'black friday deal'.

author: TK
author_rank: Super Contributor
timestamp: November 25, 2019, 03:53:13 pm
content: It must be the worst black friday deal ever... 3%?

author: geostep
author_rank: Regular Contributor
timestamp: November 25, 2019, 04:14:49 pm
content: It would be interesting if Rigol came out with a replacement for the DS1054Z. This scope has been out for four years now and IMHO the market is probably saturated with them. However as many have said this is a steal of a deal for a entry level 4 channel scope.- George
Suggestion to capture and generate two channels, ttl under 2KHz - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: November 22, 2019, 04:15:37 pm
content: Hello Mates,I need to record from two sensors at 5V square, each sensor is one side of an axle of a running vehichle over different terrains.The max frequency would be under 2KHz, record length around 10 seconds or so. Them I need to play this back at 5V and feed in my DUT. The idea is to improve the device algorithm in the lab as diesel off road trucks are not the best lab environment for codding). My DUT could output the frequency with a serial connection.I came across a very cheap and used National Instruments USB DAQ NI 6251http://www.ni.com/pdf/manuals/375213c.pdfAs the environment is very harsh I would prefer something small and simple.Right now, I do not want to develop any tool, just need something simple to use.I've tought buying an FY6900 AWG to play back, not sure if its the best option.

author: joeqsmith
author_rank: Super Contributor
timestamp: November 22, 2019, 10:56:06 pm
content: Depending on the low end, maybe just record it with your cell phone then on playback, run it through a comparator to square it back up. Cheap, simple and you could make as many recordings as you like.

author: TurboTom
author_rank: Super Contributor
timestamp: November 22, 2019, 11:19:20 pm
content: Analog DevicesADALM2000?

author: rvalente
author_rank: Frequent Contributor
timestamp: November 23, 2019, 08:06:23 pm
content: Quote from: joeqsmith on November 22, 2019, 10:56:06 pmMy cellphone cant record in stereo but, you gave me a good and simple idea. Capture de sensor speeds with the board itself, send to serial to the pc, try to reproduce this table of frequencies with audacity or other audio software, output through some cheap sound card and square it
Wanted: Hameg HM1507-3 Oscilloscope Service Manual - Page 1
Forum section: electronics / testgear

author: mlinuxk
author_rank: Newbie
timestamp: November 24, 2019, 09:46:55 pm
content: I have a Sencore SC301 oscilloscope and component analyzer that was stored in a dry unheated out building for 16 years. It was never used.I opened it and everything looked good, I powered it up and it came on. Good trace, tested the inputs, looked brand new.I let it burn in for a couple of days ,yesterday it was fine, but saw a little jumping in the OSD.Autostart seems to proceed normal.Today, no HV? No display!It was made by Hameg seems to be similar to HM-1505 or HM-1507 but I can't find a service manual on line.Anybody know where I can find one?
(DER EE) Multimetrix DMM 121 multimeter teardown  - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 22, 2019, 12:32:43 am
content: Nothing new and exciting really.Multimetrix are Chauvin-Arnoux's "budget" range. Every time I've been seeing these multimeters I've been wanting to know how crappy they really are, a few days ago one showed-up cheap enough to take a risk.It turns out to be a re-badge of the DER EE DE-241(C) so also similar to the Hioki DT4211. Only a few changes on the function switch between them.The build quality is actually much better than expected, PCB layout is neat with cut-outs and a little plastic shielding, input protection, real fuses.The two halves of the case are held together by four screws making a sturdy assembly, another four screws with brass inserts this time, to get access to AA batteries is a little too many to my liking.Calibration is all oldschool trimpots, no problem as this meter is pretty much (s)pot-on. The big downside IMHO is the black blob making it not-so user repairable if you do successfully defeat the input protection repairing your microwave oven.The TQFP footprint seems to fit the FS9721.https://cxem.net/izmer/files/izmer179_FS9721LP3.pdfIn the end I think this meter is much better value for money than something like the Metrix MX24

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 23, 2019, 06:26:31 pm
content: Would anyone like to point me to logging software for FS9721 based multimeter's?Thanks !
HP/AGILENT 54845A Infinium SRAM Location? - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 22, 2019, 11:35:32 pm
content: All:I am getting an error on my Infinium when I run Self Test. It’s the SRAM FAIL and the detailed description of the failure is:Address = 00000000, Expected = 00000000, Received = 000000FFI am trying to locate the SRAM on the Main Acquisition Board. I was told that the SELF TEST is for the circuitry on the Acquisition Board and would not be testing anything attached to the PC Motherboard. Could someone point me in the right direction? Also, if you happen to have the part number, this would be most helpful.Rich

author: Alfons
author_rank: Regular Contributor
timestamp: November 23, 2019, 08:28:17 am
content: According to the service guide, the message indicates errors on the Scopes Interface Board (Video SRAM or Nonvolatile SRAM). And there the SRAM should be easy to find.http://literature.cdn.keysight.com/litweb/pdf/54846-97002.pdf

author: AJ3G
author_rank: Regular Contributor
timestamp: November 23, 2019, 02:21:22 pm
content: Hi Alfons:You would think, but I am not seeing it. I have replaced the A6 Board, and am still getting this exact failure. I also note the video is acting a bit strange too. All other test pass, but the SRAM. It is possible I have two malfunctioning A6 Boards, as one was original to the scope, and the other was purchased new.Rich
please explain me the function of bulbs in a oscillator - Page 1
Forum section: electronics / testgear

author: Martin.M
author_rank: Frequent Contributor
timestamp: November 23, 2019, 06:22:36 am
content: hello friends,I want to know how that works,in the oscillator are 2 Bulbs (10W?) in series, working in the system.They are cold, nothing is glowing there.thank you for explain me the old engineering. it seems to be for constant amplitude, but why with bulbs?The apllication call them as R , means resistors.Martin

author: KE5FX
author_rank: Super Contributor
timestamp: November 23, 2019, 06:30:18 am
content: Two good links on the subject:Max Wien, Mr. Hewlett and a Rainy Sunday Afternoonhttps://hackaday.com/2012/11/18/jeri-uses-light-bulbs-in-an-oscillator/

author: RoGeorge
author_rank: Super Contributor
timestamp: November 23, 2019, 06:39:12 am
content: A filament bulb increases it's internal resistance with temperature, thus acting as a resistor controlled by the RMS voltage of the oscillations. This happens for any temperature ranges, even when the filament is not yet hot enough to glow.If you would look with a thermal camera, you would see the bulb filament high in temperature. Try to look at them in complete darkness, you might spot them glowing faint, or maybe try looking through the camera of your phone or using a webcam (thought cameras are supposed to have an infra red filter inside them, some cameras can still sense infra red AKA heat, i.e. they can easily show the infra red LED from a remote control as lighting up when a button on the remote is pressed).

author: Martin.M
author_rank: Frequent Contributor
timestamp: November 23, 2019, 07:00:08 am
content: thank you.The bulbs work as PTC,and they have not use PTC about a different temperature/resistance curve related to a bulb.Very amazing technology.I have found bulbs in various units,in my 200CD oscillator,in a DMM input stage,in my AC stabilizer is a custom bulb made by Radium,and in my Krohn Hite Oscillator is a opto coupler made with a bulb and a LDR, also for constant amplitude.Martin

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 23, 2019, 10:05:55 am
content: Bulbs are also sometimes found on loudspeaker crossover networks as a peak power limit before the fuse kicks-out as a last resort.

author: AVGresponding
author_rank: Super Contributor
timestamp: November 23, 2019, 12:55:10 pm
content: I've seen a filament lamp with an LDR used in an audio compressor.I believe they can be used in some valve based equipment as a photon source to bias valves?
Fluke 8842A that is in "touch and hold" mode. - Page 1
Forum section: electronics / testgear

author: Paceguy
author_rank: Regular Contributor
timestamp: November 23, 2019, 05:37:41 pm
content: I have a Fluke 8842A that measures correctly but appears to be in a " touch and hold" mode. If I measure a DC voltage and than remove the voltage source, the reading remains displayed until I short the test leads and only then does the reading return to or near to zero volts. It does this when in auto range or manually selected ranges. When in ohms mode, all works as should and returns to infinity. Does anyone know what causes this? Has anyone had the same problem with a Fluke 8842A or 8840A?

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 23, 2019, 06:59:25 pm
content: This is because of the very high input inpedanca. You basically charge the input and its capacitancy keeps the voltage, like a sample and hold circuit.This is only up to the 20V range, above that it has much lower impedance.This is completely normal.

author: Paceguy
author_rank: Regular Contributor
timestamp: November 24, 2019, 01:01:07 pm
content: Thanks LazyJack, I'll do some further testing to verify that and see if it does it on a higher range setting not using auto mode.

author: LazyJack
author_rank: Frequent Contributor
timestamp: November 24, 2019, 01:35:02 pm
content: You can also see that by touching the test leads, the reading will go to zero.
LeCroy WaveRunner Xi MSO? Serial Decode ? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: November 22, 2019, 01:02:04 pm
content: I'm considering a 2nd hand WR 64Xi.Does this beastie do MSO stuff and serial protocol decode?ThanksDavid

author: 2N3055
author_rank: Super Contributor
timestamp: November 22, 2019, 01:20:48 pm
content: All decodes are software options. It has tons of very good decoders available.MSO is a separate hardware (expensive) box.

author: joeqsmith
author_rank: Super Contributor
timestamp: November 22, 2019, 11:01:03 pm
content: Video showing my 64xi sniffing a SPI bus.https://youtu.be/f1UtLpSZ2W0?t=1098
Big TE auction. Ending soon! - Page 1
Forum section: electronics / testgear

author: mtdoc
author_rank: Super Contributor
timestamp: November 21, 2019, 05:39:59 pm
content: Just got an email on this. Looks like some good stuff. Ends soon.Auction: ORACLE - Assets Formerly of Oracle Corp.Alas, my GAS is under control and not interested in getting more TE at the moment...

author: thm_w
author_rank: Super Contributor
timestamp: November 21, 2019, 10:50:07 pm
content: oh cool, air bearing spindle:https://edispositions.nextlot.com/public/sales/86796/lots/18476847Lots of vacuum pumps if someone needs one of those..

author: jmw
author_rank: Frequent Contributor
timestamp: November 22, 2019, 02:33:07 am
content: Saw that a few days ago. Still trying to figure out what Oracle, a software company, was doing with that kind of equipment. Unless it was Sun equipment, but 10 years is a long time to keep stuff in a warehouse.
Habotest HT206D AC DC  - Page 1
Forum section: electronics / testgear

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: October 18, 2019, 06:54:22 pm
content: Hello friends, I would like to know if anyone has tried this ampirometric clamp, since I liked the price and the benefits.https://es.aliexpress.com/item/4000087836346.html?spm=a2g0o.cart.0.0.66e83c00SI9pY0&mp=1

author: 001
author_rank: Super Contributor
timestamp: October 18, 2019, 07:26:56 pm
content: hobo test?

author: k03d13l
author_rank: Newbie
timestamp: November 22, 2019, 02:15:53 am
content: I Just bought this tools about idr 350.000 or about $25.all function working fine, but sound of continuity buzzer test little annoying.zero function is not same as relative, just for zeroing dc current value test, only work for current measurementover all i think $25 clamp meter include DC current measurement is worth to buy.another features.backlight will orange color if some measurement got high value for warning sign (normal backlight is white).package;1. unit2. probe3. thermocouple
Mantis with 6xSLWD lens in Ebay - Page 1
Forum section: electronics / testgear

author: Pinkus
author_rank: Frequent Contributor
timestamp: November 20, 2019, 08:53:24 pm
content: This:https://www.ebay.de/itm/293329288744will run out in 1.5 hours. It is a Mantis including the very very seldom (because everybody keeps it) and usually very expensive 6x SLWD lens (super long working distance). Price is only at $227 yet.I thought I go and buy it myself and sell it with a profit before I recognized that the international shipping was not $63 but $637So if you are from the US: try to get this. Everything below $500 is a bargain.(I am not related with the seller)
Looking for HP8568A/HP8566A eprom contents - Page 1
Forum section: electronics / testgear

author: bsdphk
author_rank: Regular Contributor
timestamp: November 21, 2019, 10:57:37 pm
content: For a computer archaeological project I am looking for the EPROM content of the HP8568A and HP8566A spectrum analyzers.Ko4bb has only eprom images for the B models.Back-story for those who care:The firwmare for the HP856x were written in "WHEELGOL", which is not quite ALGOL, and I want to find out how much the change to the 68k CPU was hindered/helped by that fact, by comparing the resulting binary code topology and function signatures.See also:https://github.com/bsdphk/PyReveng3/tree/master/examples/HP8568BThanks in advance,Poul-Henning
Fluke lanmeter 686 firmaware and update utilitys - Page 1
Forum section: electronics / testgear

author: equx4567
author_rank: Newbie
timestamp: November 03, 2018, 02:29:27 am
content: I picked up an old lanmeter 686 and am looking to run the firmware update on the device but can not find a place to download it from. There is a thread where someone managed to find it but I cannot email them because when I click the email button it takes me to the topics page (would pm them but they have been offline a long time and may not get it). So I am looking for a source for the files or a way to fix the email issues so that I can ask the other user if they still have them.

author: Hairystuff
author_rank: Contributor
timestamp: November 20, 2019, 08:36:59 pm
content: I'm also looking for the same thing but completely out of luck, I could do also with a backup of the RTC NVRAM so I could restore the unit, at the moment the MAC address has been lost due to the RTC's internal battery failing.
Enertec Schlumberger 2630 counter - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 19, 2019, 10:20:03 pm
content: Today I'm looking at one of my later TEA victims (no, I'm the victim really...) an Enertec Schlumberger 2630 Counter.It lived by the seaside, that explains the state of the faceplate. Any one out here know of a company in EU that will print on aluminium?The counter is nothing fantastic a 30MHz model with stuck LEDs on the display, of course that's what you deserve when buying without testing...Anyway, I figured it would fit well with my 20MHz Enertec 4430 function generator that has the same front dimensions.Stuck LEDs have been blamed on U11 a 74LS75 latch warmer than the others and having a stuck output, we'll see when I get round to ordering that. Will have to, it is a little confusing to read as-is.Quite pleased to see a TCXO !While I was in there I took a few photos and dumped the EPROMS.I'll usually go to the trouble if they're socketed. Just for the sake of sharing the dumps if they aren't already around the internet, it's always frustrating when you have a doubt or a dead ROM and can't get hold of the contents.
SDS2000X-E  feet - Page 1
Forum section: electronics / testgear

author: Wimberleytech
author_rank: Super Contributor
timestamp: November 18, 2019, 05:13:56 pm
content: I just received my SDS2352X-ENearly my first observation is that the feed in the front of the scope...designed to elevate the front at an angle do not lock into place very well. The slightest pull (scope probe or usb stick) can cause one or both feed to fold up. I have my scope sitting on an antistatic mat that offers friction to the bottom of the feet.I plan to design a clip to hold them in place and print with my 3D printer.

author: tautech
author_rank: Super Contributor
timestamp: November 18, 2019, 07:53:19 pm
content: I get the same result when I'm in a hurry and being too lazy to place a hand on top of any of the X-E models....well any of the small compact DSO's regardless of brand.Plonking the other hand on top of the DSO resolves all these front feet folding issues in these compact and lightweight units.Enjoy your new SDS2352X-E !

author: Wimberleytech
author_rank: Super Contributor
timestamp: November 19, 2019, 08:57:03 pm
content: Quote from: tautech on November 18, 2019, 07:53:19 pmHere is my solution keeping the feet from folding. Nothing too elegant but it works.
Cossor / Biccotest T535 TDR cable tester - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 17, 2019, 12:34:15 am
content: I bought this a few months back, after inquiring on an advert the seller kept lowering the price.Although I didn't know it's working condition or have any immediate use for it, at 23€ postage included it was hard to resist.This evening it was finally powered, from the little I know about the instrument and TDR in general it appears to be working.Of course I couldn't resist looking in the box so here are a few photos.The LCD EL backlight looks way, way past it. (Maybe powering it from the CRT's acceleration voltage I'd get just enough brightness...)It is meant to hold a rechargeable battery, there is none, no clue where to where it should fit either.The user manual has been found online, any service information or schematic are more than welcome.

author: vk6zgo
author_rank: Super Contributor
timestamp: November 17, 2019, 01:55:04 pm
content: A bit of useless, but perhaps interesting information.The name "biccotest" suggests that it was made by a subsiduary of, or for:-"British Insulated Callendars Cables", who were a very large manufacturer of copper wire & cables of all varieties.At my first job, we had a semi-autonomous section which was dedicated to the sale & supply of cables from the Australian agents/subsiduary of BICC.

author: shakalnokturn
author_rank: Super Contributor
timestamp: November 19, 2019, 02:10:45 pm
content: Thanks for the information and story.Could Cossor have been the manufacture? I'm not familiar with their equipment so wouldn't recognise the style if I met it.I spotted an evil bay listing with the same TDR only it was labelled "Cossor".Over the years so many companies merge into corporations leaving near to no written trace of what they once produced, that it's hard keeping track.
How practical is handheld LCR-Pro1 meter compare to desktop models - Page 1
Forum section: electronics / testgear

author: toolsavvyorg
author_rank: Newbie
timestamp: November 18, 2019, 07:14:34 pm
content: I was asked recently by one of my customers what is an advantage in buying LCR-Pro1 compare to a desktop LCR-Meter. Here are a few points based on my own experience.https://www.lcrresearch.com/wp-content/uploads/2016/06/Pro1-ocerview-web.jpgConvenient test probes:Twizzer type tips allow handling SMD components. It is a useful feature since most passive components don't have clear markings. The SMD components can be picked up, or they can be PCB mounted. I had no problem working with passive components sizes as small as 0402.Always ready:The device takes a very little space and can be turned on in less than 1 second. It also turned off after a period of inactivity.Ergonomic design:The TH2830 desktop LCR meter I have required several operations before I can start measurement. It's an excellent device overall with 0.05% basic accuracy and tweezers style tips. But, LCR-Pro1, with 0.1% basic accuracy much more comfortable to use. It has an option for automatic component identification. Menu and measurement easy to read and navigate. Plus, it has a lot of extras, like fast self-calibration, function shortcuts, diode testing, etc.In-circuit troubleshooting:With a test voltage set to 0.2V, one can measure PCB mounted component impedance. It gives enough data to identify failed components or IC pins. I am using dedicated PC software with USB communication dongle to troubleshoot multiple boards.
Cheap Aliexpress Frequency Counter 1Hz-75MHz need schematic - Page 1
Forum section: electronics / testgear

author: Andbro
author_rank: Regular Contributor
timestamp: November 18, 2019, 01:45:29 pm
content: Hi,Is there anyone who has the scheme of this frequency counter?https://www.aliexpress.com/item/32719623375.html?algo_pvid=71c4cf1c-f7a9-49e5-a4db-cb2dc3030808&algo_expid=71c4cf1c-f7a9-49e5-a4db-cb2dc3030808-1&btsid=517c0b4e-2ac4-4266-b412-fdaf6e18f01e&ws_ab_test=searchweb0_0,searchweb201602_10,searchweb201603_55Thank

author: schmitt trigger
author_rank: Super Contributor
timestamp: November 18, 2019, 02:04:13 pm
content: A low resolution photo is not helpful at all.You should at least include the link to the web page where you found this.Most likely the additional information will still be worthless, but one never knows.....................

author: horo
author_rank: Regular Contributor
timestamp: November 18, 2019, 02:45:37 pm
content: Hi,This looks like an upgraded version of theDL4YHF counter.Martin

author: indman
author_rank: Super Contributor
timestamp: November 18, 2019, 03:02:35 pm
content: 1.https://www.zl2pd.com/xtalchecker.html2.https://www.ebay.co.uk/itm/Digital-Frequency-Counter-Meter-1Hz-50MHz-DIY-Kit-Tester-High-Sensitivity-W3Z6/392118950342?hash=item5b4c1c59c6:m:mV2xtm7En92hMp-UL7d9f3w&var=661057226334
Solartron 7075 Digital Voltmeter GPIB Commands - Page 1
Forum section: electronics / testgear

author: electricEngineer
author_rank: Newbie
timestamp: November 21, 2019, 10:15:27 pm
content: Hi all,I have successfully pushed the Solartron 7075 into the 21st century by adding a GPIP to USB adapter.The data evaluation of the actual measured values works excellent. (++read command on the AR488 GPIB Interface)Unfortunately I didn't find any information in the documentation about the GPIB commands, for example to change the integration time via GPIB.Does anyone has any further information about that?Link to the DMM manual:https://elektrotanya.com/solartron_schlumberger_7075_sm.pdf/download.htmlI didn`t found any information about the GP-IB Interface Unit 70755.The only information I got so far is the GPIB address, which was handwritten on the Interface Unit: 22

author: egonotto
author_rank: Super Contributor
timestamp: November 22, 2019, 02:28:15 am
content: Hello,in der Not fressen Fliegen den Teufel.Perhaps the GPIB commands from other Solartron DMM can help you."http://w.ko4bb.com/getsimple/index.php?id=manuals&dir=06_Misc_Test_Equipment/Solartron/Solartron_7150"The "Solartron_7150_Plus_6.5_Digit_Multimeter_Operator_Manual.pdf" has GPIB commands for the 7150plus.As example try R0 or R1 or R2 to select the range.Best regardsegonotto

author: electricEngineer
author_rank: Newbie
timestamp: November 23, 2019, 12:14:03 am
content: Thank you for the new starting point, unfortunately the commands differ from each other.A little trial and error research resulted in the following command sets: (it seems that it doesn't depend on the letter, but on the position of the numbers)Code:For local Readings++addr 22++auto 3++readTo execute remote Commands++auto 1Single SampleMODE SET 2Repetition SampleMODE SET 3GET MODE USERMODE 1GET MODE REMOTEMODE 2INTEGRATION TIME 1ms -> 10s1ms:MOD020ms:MOD1100ms:MOD21s:MOD310s:MOD4FunctionRatio:MO0OHM:MO1AC:MO2DC:MO3
Help me understand my scope's behavior - Page 1
Forum section: electronics / testgear

author: rea5245
author_rank: Frequent Contributor
timestamp: November 16, 2019, 10:43:36 pm
content: Please help me understand my scope's behavior.I have a Rigol 1054Z. I connect a signal to it and it looks very high frequency - so high that I can't see the transitions. (But in reality, it's not a high frequency signal.) I stop the acquisition and it still looks high frequency. I change the timebase from 2uS to 1uS, and suddenly it looks the way it should. I change the timebase back to 2uS and it still looks good.I uploaded a video of this to YouTube:https://youtu.be/jlUZMwggMbMWhy doesn't the scope display the correct waveform while it's running? Why do I have to stop it and fiddle with the timebase?Thanks,Bob

author: DaJMasta
author_rank: Super Contributor
timestamp: November 16, 2019, 10:52:01 pm
content: Looks like the second channel trace is being saved as the untriggered image, and when you zoom (should work in or out, probably horizontal or vertical) it's redrawing the image based on the captured information. Think of it in terms of when the trace is actually rendered: the blue trace is rendered to the screen as it appears when retriggering, but when you stop it (vs. if you did a single shot capture), it just stops redrawing, instead of redrawing the trace in memory once more.Maybe not an intended behavior, but if you know to adjust a knob and back you can work around it - are you using the latest firmware?Worth adding: you definitely shouldn't see this behavior if instead of pressing stop, you pressed single, though it would be capturing one trace of the memory depth again after the point you pressed it - which could matter on non-repetitive signals.

author: rea5245
author_rank: Frequent Contributor
timestamp: November 16, 2019, 11:17:24 pm
content: Thank you. I was expecting the second channel to be synced with the first, so I assumed triggering on the first was sufficient. Turns out they're not synced. That's a bug in my project.I did not have the latest firmware. Amusingly, the release notes for the latest version say:QuoteSounds like what I'm seeing. So I upgraded. But the Rigol still doesn't redraw when I stop; I need to change the timebase.But I least I understand my original issue now. Thanks.- Bob

author: Performa01
author_rank: Super Contributor
timestamp: November 17, 2019, 12:00:48 am
content: Quote from: rea5245 on November 16, 2019, 11:17:24 pmEven when the two channels are in sync, you always need to trigger on the lower frequency signal to get a stable picture.
A method of finding PCB short circuit - Page 1
Forum section: electronics / testgear

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 03:11:42 pm
content: Please look at pictures

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 03:17:57 pm
content: Continue to

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 03:23:41 pm
content: Continue to

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 03:25:13 pm
content: Continue to

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 03:26:09 pm
content: Continue to

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 03:27:00 pm
content: Continue to
A method of finding PCB short circuit - Page 1
Forum section: electronics / testgear

author: hgjdwx
author_rank: Regular Contributor
timestamp: November 16, 2019, 02:58:28 pm
content: Sorry, please look at another topichttps://www.eevblog.com/forum/testgear/a-method-of-finding-pcb-short-circuit-218568/
$60 3Ghz+ USB Spectrum Analyzer?? - Page 1
Forum section: electronics / testgear

author: tmf
author_rank: Contributor
timestamp: November 14, 2019, 06:31:48 pm
content: Found this on Banggood searching out the cheap oscope... and found what sorta looks like a similar cheapo SAhttps://www.banggood.com/custlink/DK3GeqL6ZGRichardS

author: tmf
author_rank: Contributor
timestamp: November 14, 2019, 06:35:02 pm
content: Actually now I read it again, 4.4Ghz??

author: james_s
author_rank: Super Contributor
timestamp: November 14, 2019, 08:46:05 pm
content: Maybe in 10-20 years such a thing will be a reality but right now call me skeptical. I wonder what it's actually capable of? Maybe it's using one of the various RTL SDR chips? Those were a breakthrough, a simple hack of a commodity part dropping the cost of SDR an order of magnitude or more so maybe the same will happen eventually for specrum analyzes.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 14, 2019, 08:59:46 pm
content: Quote from: tmf on November 14, 2019, 06:35:02 pmAh, good ol 4.4GHz, the telltale frequency that gives away their entire LO architecture, lol.

author: aandrew
author_rank: Frequent Contributor
timestamp: November 14, 2019, 09:09:42 pm
content: I picked this one up:https://www.aliexpress.com/item/32968659654.htmlI'm not expecting the world from it, but in an aluminum case and allowed to get up to temp, I'm hoping it'll be sufficient for ISM filter development/antenna tuning/matching type work.

author: thm_w
author_rank: Super Contributor
timestamp: November 15, 2019, 12:05:22 am
content: http://www.epanorama.net/newepa/2019/08/10/cheap-spectrum-analyzer-and-signal-generator/

author: ebclr
author_rank: Super Contributor
timestamp: November 15, 2019, 09:08:36 pm
content: I get this onehttp://www.saelig.com/siglent-spectrum-analyzers/ssa3032x.htm

author: tautech
author_rank: Super Contributor
timestamp: November 16, 2019, 03:58:26 am
content: Quote from: ebclr on November 15, 2019, 09:08:36 pmIf it's not too late cancel and get the latest Plus model with touch, keyboard and mouse support plus modulation analysis:http://www.saelig.com/siglent-spectrum-analyzers/ssa3032x-plus.htm

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 16, 2019, 12:17:25 pm
content: meh, i ordered one just for fun...$42