hybridfree/eevblog-posts huggingface dataset:
Interesting continuity test results - Page 1
Forum section: electronics / testgear

author: ledtester
author_rank: Super Contributor
timestamp: November 14, 2021, 03:44:42 am
content: I picked up an Ikea cordless drill -- the FIXA -- at a thrift store, and I came upon a curious observation about how different multimeters perform a continuity test at two points in the drill's circuitry.The FIXA is powered by two 18650 li-ion cells in series. AvE has a complete teardown video here:BOLTR: WORST IN CLASS IKEA Drill -- AvEhttps://youtu.be/s4RPN7WM4gII made this video showing how different multimeters perform the continuity test:https://youtu.be/ja84dcZ9gToThe two tests points are: the junction of the li-ion cells and a point on the PCB which is also the center pin of the charger port (the + terminal). Tests were made with the positive probe on the junction/negative on the PCB and also switched around. The observed results are:Extech MN16A:* Positive on junction: no beep* Positive on center pin: beep, second chirp when probe is removed sometimesUni-T 210E:* Positive on junction: no beep* Positive on center pin: beep, lingering beep after probe removed especially if test is not shortExtech 330:* Positive on junction: no beep* Positive on center pin: beep, second chirp when probe is removed (like MN16A)Aneng 8008:* Positive on junction: no beep* Positive on center pin: beep, lingering beep after probe removed unless test was shortFluke 73:* Positive on junction: no beep* Positive on center pin: quick chirp most of the time both when test is made and probe is removedFluke 8845A (not shown in the video):* Positive on junction: no beep* Positive on center pin: no beepI'm not too surprised by the dependence on the polarity of the probes... there is a lot of circuitry between the two test points including devices which may admit current flow only in one direction.I'm a little more puzzled by the lingering beep that the Uni-T 210E and Aneng 8008 exhibit.

author: ledtester
author_rank: Super Contributor
timestamp: November 14, 2021, 05:45:37 pm
content: Update: I just performed continuity tests across a 1.5V battery and I got similar results, including the lingering beep for the 8008 and 210E.

author: BrokenYugo
author_rank: Super Contributor
timestamp: November 14, 2021, 07:39:54 pm
content: Check the test current of each meter, IIRC my Aneng 870 is like 2 mA and my old Fluke 75 is like 600 uA.

author: Shock
author_rank: Super Contributor
timestamp: November 14, 2021, 09:24:17 pm
content: It sounds like you are using the continuity function on a live circuit. The continuity, ohms and diode measurement functions are for de-energized circuits only. So batteries need to be isolated and not included in the measurement circuit.These functions also vary from meter to meter anyway as well as different voltages and current applies. So you are expected to get different chirps/beeps. Comparing software behavior in old or cheap chinese meters is generally a pointless exercise.The video you made is private btw (requires an account and login).
Analogic 6500 HDD files - Page 1
Forum section: electronics / testgear

author: riktw
author_rank: Contributor
timestamp: November 13, 2021, 07:59:48 pm
content: Heya,I recently gotten my hands on an Analogic 6500 waveform analyzer / storage scope.It's a fun and weird piece of tech, quite nicely build inside. This model has an HDD card and a DSP card inside of it.After some debugging I got it to mostly work, except for, of course, the HDD.I was wondering if perhaps there is someone with an Analogic 6500 or 6100 that is willing to share some info or files that are on the HDD, so I can get it completely up and running again with a CF card or such instead of the HDD.The machine works without, but the boot takes several minutes as it tries to talk with the non working HDD.
Yihua 853A Missing Parts - Page 1
Forum section: electronics / testgear

author: gboutique
author_rank: Newbie
timestamp: November 15, 2021, 01:06:54 am
content: Hello everyone, I wish you could help me, I have a Yihua 853A pre-heating station (there are other brands for the same machine). In a recent move I lost the set of adjustment knobs (see attached photo). If someone who owns this or a similar station, could give me the measurements of the screws and / or tell me where I can buy them (USA).Thank you very much for your time.Gboutique.
HP 8590 series options. - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: November 13, 2021, 04:46:40 pm
content: Does anyone have a break down of which options for this line of spectrum analyzers are just software upgrades?

author: veedub565
author_rank: Frequent Contributor
timestamp: November 13, 2021, 07:59:06 pm
content: I don't think there are any options on these that is just a software upgrade. Most if not all of the options require hardware changes. There's a few things on the ESA series which are software enabled, but even then it's not a simple task to enable them.
HP 8590 series spec/an memory card reader upgrade? - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: November 10, 2021, 11:53:48 pm
content: Did a basic google search, but nothing found, so I'll ask here, anyone familiar with upgrading the memory card reader in this series of spectrum analyzers to use SD cards for example?

author: grendle373
author_rank: Contributor
timestamp: November 11, 2021, 03:49:55 pm
content: Never seen one. Not saying someone hasn't done it, But I've never seen one on a 60 or a 90 series. They did do a USB upgrade on the network analyzers ( 8510, 8753, etc) but it didnt quite work out. The unit will only see 1.44 Mb free as it did with the floppy reguardless of the usb size. It may take some fiddling with the CPU.

author: bingo600
author_rank: Super Contributor
timestamp: November 11, 2021, 04:05:02 pm
content: The storage card for a 859x is actually a Rom/Ram chip w. battery backup.And makes full usage of the address/data lines.Not impossible to make something , but more complicated than "just" ..../Bingo

author: grendle373
author_rank: Contributor
timestamp: November 11, 2021, 05:54:20 pm
content: true. I believe the cards were also used in singer sewing machines. sounds funny but true. although that may have been the cards for the 8560'S

author: bingo600
author_rank: Super Contributor
timestamp: November 11, 2021, 07:07:35 pm
content: Quote from: grendle373 on November 11, 2021, 05:54:20 pmThey were used in their calculators ie. HP 48

author: Bicurico
author_rank: Super Contributor
timestamp: November 11, 2021, 07:14:46 pm
content: The memory cards of the HP859x series don't work in the HP48GX calculator. They are not even physically compatible.Both memory card types just look similar on pictures.Also, I wonder why someone would want to replace the memory card reader of the HP859x with an SD card reader: it's not like there is much memory needed to store the personalities, macros or measurements. Plus, one can easily transfer all the data via GPIB interface to a PC.

author: bingo600
author_rank: Super Contributor
timestamp: November 11, 2021, 07:34:17 pm
content: Quote from: Bicurico on November 11, 2021, 07:14:46 pmI'm quite sure the 48SX uses the same cards/Bingo

author: Bicurico
author_rank: Super Contributor
timestamp: November 11, 2021, 09:18:06 pm
content: Perhaps the HP48SX uses different cards than the HP48GX. It tried it on my calculator (HP48GX) and the card would not fit physically.EDIT: a "not" was missing...

author: xwarp
author_rank: Frequent Contributor
timestamp: November 13, 2021, 04:31:25 pm
content: Thanks for the replies!Wasn't sure if that was something that was reasonably feasible, and, worth the time.
HP4156A controlled by Keysight EasyExpert Software? - Page 1
Forum section: electronics / testgear

author: Aheld
author_rank: Regular Contributor
timestamp: November 13, 2021, 11:23:00 am
content: Hello Forum,I'm thinking about how to optimize the usage of my HP4156A Parameter analyzer and found the user friendly software from Keysight (EasyExpert).A fast look into the documentation told my that the software is supporting 4156 "B" and "C" devices, but not an "A" device.I'm just wondering why?A connection via GPIB is possible, the software is verfying the connection to the 4156A, but after starting software it seems that EasyExpert is reading the IDN string and checking for "B" device type.Does anybody found a workaround, or simple a technical reason why "A" devices are not suppored?ThanksAxel
Tektronix AFG 31000 hack ? - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: August 28, 2020, 06:59:41 am
content: As key-based options & bandwidth upgrades are available, just wanted to know if anyone had started looking into this ??BW upgrade from 25 -> 100MHz available, as well as from 150 -> 250 MHz, would suspect that 150 Mhz h/w is different.FW is compressed, not encrypted (at least not completely), already something positive...

author: Sighound36
author_rank: Frequent Contributor
timestamp: August 28, 2020, 08:04:01 pm
content: Hello DarkstarYou are correct two bandwith hardware limits, I have a 150mhz version so I to would be intetested in any software upgrades availability

author: tv84
author_rank: Super Contributor
timestamp: August 30, 2020, 09:42:35 pm
content: The FW uses signed software package.Any change to a FW package requires an inside access to the machine to bypass the signature verification.

author: wizard69
author_rank: Super Contributor
timestamp: August 31, 2020, 01:05:46 am
content: Quote from: tv84 on August 30, 2020, 09:42:35 pmThis whole idea of designing in features and then requiring a "key" to unlock them just rubs me the wrong way. Even more so if it is something like a bandwidth increase which means the hardware was always there.

author: luis garcia
author_rank: Regular Contributor
timestamp: November 12, 2021, 11:16:35 pm
content: Would be happy to lend my AFG3011 to anyone who has the expertise to hack these kind of tools.Or alternatevely, i would be ready to perform any action you suggest to extract the information you need.I never used my AFG3011 as i needed more frequency soon after i ordered it. It is new in its box. But i would like to give it a chance if bw can be upgraded!

author: rodpp
author_rank: Frequent Contributor
timestamp: November 13, 2021, 03:27:59 pm
content: I'm afraid that AFG3011 have no update options.The model discussed in this thread is the newer AFG3100, that has update options.
Uni-T ut61 range discontinued - Page 1
Forum section: electronics / testgear

author: rorymax
author_rank: Contributor
timestamp: November 12, 2021, 08:49:35 pm
content: Hi, I see that on the UNITREND website that all of the UT61 range has been discontinued.If I read it correctly the new products to replace that range is desiginated UT161.The new UT 161E model is designated as an EU compliant\certificated option.I am thinking of buying the UT161E, I would be happy to pay a little more if there is a better option, can I ask what the views are of thisUT 161E.Thanks All,R

author: AndrewBCN
author_rank: Frequent Contributor
timestamp: November 12, 2021, 08:57:54 pm
content: 1. That's old news.2. The UT61 range has been replaced by the UT61+ range.3. The UT161 range is the same as the UT61+ range, but Intertek certified and, at least for the UT161E (equivalent to the UT61E+), with better input protection.

author: Fungus
author_rank: Super Contributor
timestamp: November 12, 2021, 09:51:11 pm
content: Quote from: rorymax on November 12, 2021, 08:49:35 pmIt's the same meter as the 61E but with a little bit more input protection.(still no big surge resistor though, and still has the silly hFe range taking up valuable space on the dial)The Anang 870 measures just as well for half the price. The only thing the Uni-T really has going for it is the PC data connection.

author: C.J.S.
author_rank: Contributor
timestamp: November 12, 2021, 10:31:33 pm
content: Quote from: Fungus on November 12, 2021, 09:51:11 pmSmall correction: The UT161E is (almost) the same as the UT61E+, as already indicated by AndrewBCN.The UT161E is supposed to have better input protection than the UT61E+, and for sure the physical dimensions of the two fuses (for the mA and A ranges) in the UT161E are larger. Also the UT161E is CE certified, so that it is safe to assume that this meter meets the CAT III 1000V / CAT IV 600V ratings that are mentioned on the meter.
Th26001A Freguency - Page 1
Forum section: electronics / testgear

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: October 26, 2021, 08:26:14 pm
content: I am in need of a test fixture for an HP 4271B 1MHz LCRDo the Tonghui test fixtures work at these frequencies?Wally

author: clint810211
author_rank: Newbie
timestamp: October 27, 2021, 03:22:28 am
content: The fixture could work under 10kHz only.

author: Kean
author_rank: Unknown
timestamp: October 27, 2021, 04:31:55 pm
content: If you want higher frequency, then check out other models on the Tonghui website.https://www.tonghui.com.cn/en/product_list_192.htmlMaybe TH26005B, TH26048, or TH26048A.I'm not clear on the differences between the models unfortunately.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: November 11, 2021, 04:21:20 pm
content: I purchased the TH 26001A. Ir appears to work well with my repaired HP 4271BWally
Hantek DSC2D15 FFT Zoom - Page 1
Forum section: electronics / testgear

author: Edues
author_rank: Newbie
timestamp: November 11, 2021, 08:35:01 am
content: Hi,I am new to the forum, also in the use of Oscilloscopes, I have a doubt, I can't find the FFT zoom setting on the Hantek DSC2D15.Maybe it is not a direct adjustment, I have played with other controls trying to increase the display, but with little success.does this function exist?the manual says yes, but doesn't say where.Thanks for your help

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 11, 2021, 09:54:21 am
content: Not sure on how it works on the Hantek, but on other scopes there is a relationship between FFT and the horizontal time base setting.

author: Edues
author_rank: Newbie
timestamp: November 11, 2021, 01:09:54 pm
content: thank you, you have put me on the track, let's see how far I get.
Triplett 630 - New purchase in excellent condition - HELP - Page 1
Forum section: electronics / testgear

author: markav2
author_rank: Contributor
timestamp: November 14, 2021, 01:17:25 am
content: I purchased a Triplett 630 that is in amazing condition and the gentleman I purchased it from says it has been in storage since 1970 and that he purchased it from an estate sale back then. I've been looking for some resources online so I can see if the story checks out if it is that old. Having a hard time finding a very comprehensive site on that model. I have noticed in some videos I've been watching that the internals of mine is in some ways quite a bit different. The batteries are in a different position even though the battery compartment is there and just not populated like other models of the same meter. Fuse holders are there but not used and look to be never have been used.Any information or a site you can point me to would be very much appreciated. Thank youBelow are some pictures if they actually show up I am trying to link them from my onedrive account and they do not seem to show up in the preview so maybe they will in the final post.Here's a link to the photos individually on my Google drive.https://drive.google.com/file/d/1-GCAZhx0CrD_w7ZncNyeqmdhWXgyx_Y9/view?usp=sharinghttps://drive.google.com/file/d/1-U1NtK3MqbOYhDF2tgdaB9ZSqhejtHHj/view?usp=sharinghttps://drive.google.com/file/d/1-cwCRVxaQLA-oFRkcHEnti73uVtrS3CI/view?usp=sharinghttps://drive.google.com/file/d/1-fHElM4Bxva_4elVj25-gKHGb-5oejnY/view?usp=sharing

author: coromonadalix
author_rank: Super Contributor
timestamp: November 14, 2021, 01:59:37 am
content: your google drive is asking to request you / grant access, you should have linked your images here instead see the posting rules for images sizes and quantity ...

author: WattsThat
author_rank: Frequent Contributor
timestamp: November 14, 2021, 04:06:34 am
content: Post the photos correctly on this site, don’t force people to go to some unknown google drive.There should be some date codes on the larger resistors, that should give you an accurate date of origin.
Warranty terms and calibration of Keithley DMM6500 vs Keysight 34465a  - Page 1
Forum section: electronics / testgear

author: aronake
author_rank: Frequent Contributor
timestamp: November 11, 2021, 12:18:47 pm
content: Hi,I am considering buying either a Keithley DMM6500 vs Keysight 34465a. Technically, based on reviews and reading here there preferred choice is DMM6500.One area I have not found much information about is how good Keithley vs Keysight are on warranty repairs? Anyone with experience?In my particular case I live in Hong Kong, and would probably buy the meter from one of the big components and equipment suppliers online. Is international warranty provided or need to send meter for repair?Also, anyone handed in any of these meters or similar for calibration? How much did you pay?
DG2000 and how to read a CSV file. - Page 1
Forum section: electronics / testgear

author: samarkh
author_rank: Contributor
timestamp: November 10, 2021, 02:52:37 pm
content: Can anyone point me to where I can find out the format of the CSV file that the DG2072 can read with out throwing an 'Arb Wave frequency lower limit = 1uHz' error?Yours Simon M.

author: samarkh
author_rank: Contributor
timestamp: November 11, 2021, 12:32:13 pm
content: I've solved my problem;look herehttps://rigol.force.com/support/s/article/what-is-the-file-format-used-with-dg-arbitrary-waveforms2
DS1202Z-E connected to DG2072 - Any one done this yet? - Page 1
Forum section: electronics / testgear

author: samarkh
author_rank: Contributor
timestamp: November 10, 2021, 02:59:05 pm
content: I bought a DG2072 to use alongside my DS1202Z-E, According to Rigol's video you can connect the two machines together. Has anyone done this? If so how did you do it?Yours Simon M

author: Electro Fan
author_rank: Super Contributor
timestamp: November 11, 2021, 12:38:38 am
content: Connect one channel on the generator to one channel on the scope with a BNC cable. Set the generator to send a waveform (sine wave, square wave, etc) to the scope at some frequency and amplitude. Observe the waveform on the scope by adjusting the scope’s settings accordingly.

author: commongrounder
author_rank: Frequent Contributor
timestamp: November 11, 2021, 02:55:23 am
content: @Electro Fan: I don’t think that is what the OP is asking about. Newer Rigol DG generators have the ability to take control of the scope and download displayed stable waveforms into arbitrary waveforms for regeneration. The generator is the USB host device in this case, and the scope is connected via USB cable. There is an item in the arbitrary menu that selects the scope screen or memory just like an external arbitrary waveform file. I’ve done it with my DG900 series generator and DS4000 series scope. Works fine (although it’s only an 8-bit capture).

author: Electro Fan
author_rank: Super Contributor
timestamp: November 11, 2021, 03:48:24 am
content: Quote from: commongrounder on November 11, 2021, 02:55:23 amRoger that, I stand corrected. Thanks

author: samarkh
author_rank: Contributor
timestamp: November 11, 2021, 12:12:09 pm
content: You are correct commongrounder, I didn't make it very clear, sorry. Basically, I want to use the 'scope as a capture device so I can work on the signal later. I have got somewhere with using .CSV files, but what a pain!I've watchedhttps://rigol.force.com/support/s/article/three-different-ways-to-load-an-arbitrary-waveformwithout success. And it seems like Rigol hasn't moved to 64bit yet, nothing works through my windows 10 machine.
USB Logic analyzer - Page 1
Forum section: electronics / testgear

author: dige
author_rank: Contributor
timestamp: November 09, 2021, 12:10:36 am
content: I want a tool to easily decode serial protocol data. Does a logic analyzer decode a serial stream per input like the scope or does it decode parallel hex digit at a time? I am looking at the LA5016. Please let me know pros, cons, or alternates.Thanks

author: horo
author_rank: Regular Contributor
timestamp: November 09, 2021, 10:41:20 am
content: Quote from: dige on November 09, 2021, 12:10:36 amIt depends on what you tell the program.Quote from: dige on November 09, 2021, 12:10:36 amPlease be more verbose:What kind of protocol? Data rate? Single ended or differential? ...

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 09, 2021, 10:55:23 am
content: Buy one of thesehttps://nl.aliexpress.com/item/4000313591159.htmland use either sigrok or the software of Saleaehttps://www.saleae.com/downloads/It will decode most of the common protocols. Speed is limited due to the device sample rate of max 24MHz, but with 8 channels handy for a lot of tasks.

author: dige
author_rank: Contributor
timestamp: November 09, 2021, 01:09:00 pm
content: I am currently looking to use it with 1MHz SPI. And 2 Mbps BR differential UART.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 01:14:51 pm
content: For 2mbps dr uart: do you mean to tap a rs485 directly without a 485 transceiver? If so, just a specialized analyzer would do this. Other than that the saleae genuine or clone 8/16 is more than capable for a few bucks. You can use with sigrok or saleae software. Another option is the DSLogic tool, veruy well made and much more capable then what you need right now.

author: dige
author_rank: Contributor
timestamp: November 09, 2021, 01:36:37 pm
content: There is no RS485 transceiver. Do I need to get one to use with the differential UART? I have to look at the voltage levels and search.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 01:41:28 pm
content: When you say differential uart i understand RS485/RS422 or it variants like profibus/mpi/ppi or even can, they're all differential voltage levels. Whats yours specifics?

author: dige
author_rank: Contributor
timestamp: November 09, 2021, 01:47:59 pm
content: Differential UART input voltage range -25 to +25V (max and min)

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 01:55:40 pm
content: +/-25v? Are you sure? Seems one order of magnitude off. What uart is that???

author: dige
author_rank: Contributor
timestamp: November 09, 2021, 02:04:34 pm
content: It is the correct voltage range. The chip gets SPI input from a bridge IC connected to an MCU and transmits down/UP a UART daisy chain.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 02:15:03 pm
content: Im not aware of one LA that can handle such high voltages. Youll need a proper level translator and any of the suggested products can help you.
Help identifying oscilloscope accessory  - Page 1
Forum section: electronics / testgear

author: BlackFX
author_rank: Contributor
timestamp: November 09, 2021, 06:37:21 am
content: Hi teamSaw these pop up on Facebook - photo attached.Anyone have any guesses what they are? I can only think they are possibly vintage attenuators.I can find nothing when searching for an oscilloscope equaliser.

author: jpanhalt
author_rank: Super Contributor
timestamp: November 09, 2021, 10:19:54 am
content: The Pomona 2391 is an outlier. It is sold as an empty box, but someone may have added something to its insides.

author: Gyro
author_rank: Super Contributor
timestamp: November 09, 2021, 11:05:33 am
content: Regardless of what's currently in them. Those modules are really useful for making attenuators, preamplifiers, filters etc. I even put a frequency counter prescaler in one.Not as easy (or cheap) to get hold of as they once were!

author: David Hess
author_rank: Super Contributor
timestamp: November 09, 2021, 01:45:55 pm
content: Some of those boxes are "normalizers" for adjusting the load capacitance of high impedance attenuators. Inside there will be a 1 megohm resistor in parallel with a trimmed capacitance representing the input capacitance of the oscilloscope's high impedance inputs. Normalizers are essentially x2 attenuating probes.
Thermal imaging cameras - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: November 07, 2021, 10:26:49 pm
content: What thermal imaging cameras do you have / recommend of electronics / electrical work? Thanks.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: November 07, 2021, 10:38:46 pm
content: I have the UNI-T UTi260B it works pretty well for component level identification of hot spots.I did a review here:

author: tautech
author_rank: Super Contributor
timestamp: November 07, 2021, 10:45:31 pm
content: Quote from: Axtman on November 07, 2021, 10:26:49 pmThere is a whole forum section devoted to thermal imaging where you'll most likely find what others use and recommend.https://www.eevblog.com/forum/thermal-imaging/

author: Axtman
author_rank: Regular Contributor
timestamp: November 09, 2021, 12:50:44 am
content: Oh geez! Maybe I should learn to read forum topics before asking questions!Thanks for pointing that out!
Uni-T UT325 thermometer disassembly - Page 1
Forum section: electronics / testgear

author: c1400700226
author_rank: Newbie
timestamp: November 09, 2021, 12:14:05 am
content: Hi, I just took apart the UT325 contact thermometer, the internal quality is poor as expected, there are some molding plastic pieces inside..Getting such a meter for about $80, maybe I should accept thatHere are some pics:
EEVBlog BM235 loose probe connectors? - Page 1
Forum section: electronics / testgear

author: jduncan
author_rank: Regular Contributor
timestamp: October 09, 2021, 02:15:04 pm
content: I've had this multimeter about 2 years, and the banana jacks I use most often (COM + V/etc) are looes to the point that my probes fall out all the time. The others are still tight, so I know it's not a problem with the plugs.Anyone else experience this? Ideas on how to repair? Kinda disappointed with the quality, although I have used this meter more heavily than the others I've owned...

author: Bobson
author_rank: Regular Contributor
timestamp: November 07, 2021, 08:16:55 pm
content: My brand new BM253 (non-EEVBlog) has badly molded plastic coating on connectors. I guess they have bad press-form.Also, rotary switch movement produce very unpleasant feel, worse than of cheap Aneng DMM.I tried to check contact wheel, but don't understand how to remove the daughterboard. Should two wire connectors be soldered off first?

author: Muttley Snickers
author_rank: Unknown
timestamp: November 08, 2021, 05:10:33 am
content: Quote from: jduncan on October 09, 2021, 02:15:04 pmI had a similar problem years ago with my BM235 where the input jacks had also loosened up but it was due to the testing of various leads with the meter and resulted in an intermittent resistance problem with one particular set of leads, I posted about it at the time in thesupporters lounge. (Access Required)You will probably need to disassemble the meter and remove the input daughter board, this will require desoldering a couple of wires which link the main and sub board as shown in the image below. Then give the problematic input receptacles a slight crimp but be careful as they are rather soft and won't need much of a squeeze to return to the original diameter. Dave made a video or two which show the removal of the daughter board so if you are not sure about it refer to the videos for further guidance.

author: Bobson
author_rank: Regular Contributor
timestamp: November 08, 2021, 07:52:06 pm
content: Muttley, did you have any problems with rotary switch? Mine is drastically different in feel to Flukes and all other DMMs I have. And that feel is unpleasant one: you should apply force to move it, and stops are not that articulated.

author: Neutrion
author_rank: Frequent Contributor
timestamp: November 08, 2021, 08:23:23 pm
content: Quote from: jduncan on October 09, 2021, 02:15:04 pmIs the outer plastic case around the metal connection cracked? Because otherwise it is hard to imagine how it can become loose.
Which multimeter for basic measuring < 30$ - Page 1
Forum section: electronics / testgear

author: Artur.
author_rank: Newbie
timestamp: November 08, 2021, 08:02:49 am
content: Hey guys,I am normally a cs student but now subscribed to some electrical engineering courses at my university and are now playing around with my ESP8266 and some RC Controls and stuff.Currently I am modifying a server psu to use with my DC LiPo Charger and need to measure some resistors, caps and basic currents and voltages.My super cheap 5$ multimeter that I found in the garage is quite bad and the continuity checker doesn't have sound etc. So I wanted to pick up a quite cheap meter for around 30$.After doing some research I found the AmazonCommercial 90DM150 which is basically the CEM DT-9915B.I guess this should be sufficient or is there anything better that I could pick up for ~30$ ?Otherwise I would spend 55$ for the AmazonCommercial 90DM610, special offer, normally this is 85$Regards Artur

author: Fungus
author_rank: Super Contributor
timestamp: November 08, 2021, 08:09:35 am
content: Aneng 870 is the best meter in that price range.Get some gold plated leads to go with it, they're only a couple of $$ extra and make a huge difference.The 870 is sold under many brands but it's easy to recognize.

author: Artur.
author_rank: Newbie
timestamp: November 08, 2021, 08:15:24 am
content: Thats for the input.What about the 90DM610 ? I just looked up the Aneng 870 and it arround 35-40$ from Ali which would take quite some time to arrive.

author: Fungus
author_rank: Super Contributor
timestamp: November 08, 2021, 08:17:34 am
content: There's a thread here:https://www.eevblog.com/forum/testgear/amazon-do-multimeters-now/

author: Fungus
author_rank: Super Contributor
timestamp: November 08, 2021, 08:21:39 am
content: Quote from: Artur. on November 08, 2021, 08:15:24 amI don't know how long it takes where you live, here it takes about 10 days - not too bad.The 870 is made by zotek:https://zotektools.com/products/zt-219/There are many re-brands, maybe you can find one with fast shipping.

author: Artur.
author_rank: Newbie
timestamp: November 08, 2021, 08:23:20 am
content: For me its usually around 3-4 weeks.And then based on your "luck" there is additional vat when it goes through customs.

author: Fungus
author_rank: Super Contributor
timestamp: November 08, 2021, 08:26:31 am
content: Quote from: Artur. on November 08, 2021, 08:23:20 amCan't you select "ship from russia"?

author: Artur.
author_rank: Newbie
timestamp: November 08, 2021, 08:31:12 am
content: For me there are no shipments from Russia. Let me check if I find a rebrand that ships from here.The Amazon Meter seems to be fine as well. I just found a video where it is compared to a Fluke 179 III and does quite good and does only starts to fail on sinus waves above 1k Hz which doesn't be a problem for me as I am working with DC mostly.
Scope overhead in bench - Bad contrast - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 01:35:19 am
content: Hello mates,recently I've got myself a 1054Z, my bench has this two levels design, the scope stays over eyesight, its comfortable to operate but not to seeI'd like to tip down the scope 30° so I can see the screen clearly.I do a lot of projects with sheet metal laser cut, thought to make a little holder to tip down the scope but, unfortunately the 1054Z has no mount points and my last option would be to drill the back and nut rivet it.Anyway, does anyone has a solution for this?

author: commongrounder
author_rank: Frequent Contributor
timestamp: November 09, 2021, 03:02:26 am
content: I had the same issue. I solved it by making a wooden shim to prop up the rear legs of my scope. I then screwed the shim down to the shelf and ran a strap through the handle down under the shim and cinched it to prevent tipping.

author: james_s
author_rank: Super Contributor
timestamp: November 09, 2021, 05:55:54 am
content: What about using an adhesive mount? I have some heavy duty velcro that has incredibly sticky stuff on it, it would hold something like a little Rigol scope no problem. Might also work to strap it down with a strap going across the top and down the sides, just be careful that it can't slip off the back.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 12:49:27 pm
content: Quote from: james_s on November 09, 2021, 05:55:54 amGood idea! Ive some adhesive velcro. Ill strap to a sheet metal mount. Id go stainless steel, sexy! Ehehe
Siglent SDS2000X plus Threadlist - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: April 29, 2020, 08:01:31 pm
content: Hi,Same thing like my rigol 5000 list, will take this here in my signature for better finding the threads.New links are welcome.General Siglent Support ThreadSiglent SDS2000X Plus General ThreadSiglent SDS 2000X Plus Bugs/Missing Features ThreadSiglent SDS 2000X Plus HackFan ExchangeEdit: Last is not a standalone threadMartin

author: Martin72
author_rank: Super Contributor
timestamp: November 07, 2021, 08:29:14 pm
content: Added the fan exchange part in the siglent sds2000X+ thread for better finding.Martin
Oscilloscope excessive HF response in the square wave - Page 1
Forum section: electronics / testgear

author: sad123
author_rank: Newbie
timestamp: November 05, 2021, 04:13:01 am
content: I've now fixed up my Hitachi 152 oscilloscope, however the square wave test gives the excessive HF response 'uptick' distortion. Please see the following pic. I've checked all of the grounds and they are fine.It's not the probes (I've tested with half dozen probes that all give the same result - probe adjustments don't help either).What oscilloscope adjustment would get rid of this? The manual doesn't say, but perhaps one of the gain ones?

author: tautech
author_rank: Super Contributor
timestamp: November 05, 2021, 04:17:35 am
content: It's called Step Response and in the service manual there will be a procedure to set it up properly.

author: perdrix
author_rank: Frequent Contributor
timestamp: November 05, 2021, 10:30:11 am
content: Looks to me like the input attenuator adjustments need doing - for that you will almost certainly need the service or calibration manual.David

author: TimFox
author_rank: Super Contributor
timestamp: November 05, 2021, 01:07:48 pm
content: The frequency response adjustments in the input attenuator are analogous to the compensation adjustment in a x10 probe, and can give similar errors on a square wave.

author: David Hess
author_rank: Super Contributor
timestamp: November 06, 2021, 01:41:10 am
content: It depends on the time scale which we cannot see in your photo. There are three likely adjustments; high frequency transient response after the channel switch, medium frequency compensation in the vertical preamplifier, and low frequency compensation in the input attenuators.We need to know the time/div setting and square wave frequency.The test should be run with a coaxial cable directly to the oscilloscope input for the medium frequency compensation and high frequency transient response. Low frequency compensation of the input attenuators is done with a normalizer but a properly adjusted x10 probe can be used instead.

author: tautech
author_rank: Super Contributor
timestamp: November 06, 2021, 05:50:14 am
content: Quote from: sad123 on November 05, 2021, 04:13:01 amAs David says it could possibly be a number of adjustments required.In another thread you asked for a copy of the service manual, did you ever find one even one of a similar model ?You have the schematics kindly posted in the other thread so with those and a service manual for a similar model there should be enough clues to sort this out.As for amplitude adjustments they also need be checked but without a known and trusted signal source only DC checks (level) can be made and that might be sufficient to give you confidence trace amplitude is OK.What source did you use for the square wave ?
Flash Siglent SDS1104X-C to Siglent SDS1104X-E - Page 1
Forum section: electronics / testgear

author: cylau
author_rank: Newbie
timestamp: November 10, 2021, 03:19:13 am
content: I find that the Siglent SDS1104X-C is cheaper in the china market. Basically, both scopes are the same except for the Chinese user interface only.Is it possible to flash the SDS1104X-E firmware into SDS1104X-C model?

author: tv84
author_rank: Super Contributor
timestamp: November 10, 2021, 04:29:42 am
content: Quote from: cylau on November 10, 2021, 03:19:13 amMost probably.

author: tautech
author_rank: Super Contributor
timestamp: November 10, 2021, 06:12:48 am
content: Quote from: cylau on November 10, 2021, 03:19:13 amWelcome to the forum.I'm quite sure they are not as the immediate difference I see is X-C has half the WFPS update rate in Sequence mode.Datasheets:https://www.siglent.com/upload_file/document/SDS1000X-C_DataSheet_DS0101E-C04A.pdfhttps://int.siglent.com/u_file/document/SDS1000X-E_DataSheet_EN04D.pdf
Agilent u1272a built on June 2012 - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: November 05, 2021, 08:42:54 pm
content: I found an Agilent u1272a, built on 2012, I read some problems about this meter like interference and dc current measure inaccurate, I like it for smart ohm, Diode leak current and scale function. I have an U1282A from keysight, works fine but is really slow autorange. Is good option Agilent meters from 2012 year? it has same problems that keysight?

author: HKJ
author_rank: Super Contributor
timestamp: November 05, 2021, 08:51:38 pm
content: As far as I remember you have to keep you mobile phone at away from it. Placing it next to the meter will affect the readings significantly.I do not see that as a serious problem, but if you like to keep the mobile phone on the table next to you, it might be.

author: rauldm
author_rank: Regular Contributor
timestamp: November 06, 2021, 12:01:33 am
content: Thanks for your answer, this problem is on all series Or only on agilent branded?
Noninvasive handheld power meter recs - Page 1
Forum section: electronics / testgear

author: KaneTW
author_rank: Frequent Contributor
timestamp: November 04, 2021, 12:45:50 am
content: I'm looking for a handheld power meter.Requirements:* Need it for 50Hz AC only, but must measure active power/PF + ideally THD* At least CAT III 600V, ideally CAT IV* Noninvasive, must not require interruption of the existing line to install a current shunt or similar.* Measurement range should start in the single to double digit Watt.* Data logging/Bluetooth a big plus* Below 500 EUR* Three-phase would be ideal but a pipe dream at this price point, so single phase is fine.* Current clamp can be external or built-in, but cost must be included in the priceMeters that don't work:Benning CM 12 -- measurement range starts at 10kW or so.Gossen Metrahit Energy -- >1k EUR for the meter+clampHioki CM3286(-01) -- 670-740 EUR, too expensiveBrymen BM157 -- accuracy unspec at ACA < 2A for active power measurementAny suggestions? I'm also open to used true 3-phase power quality meters like a Fluke 1736 if there's a sufficiently good deal, but eBay etc is pretty blank right now in Europe.

author: French_Nikolas
author_rank: Newbie
timestamp: November 05, 2021, 03:50:11 am
content: have you considered the F205 (P01120925) from Chauvin Arnoux ?- 50Hz AC = ok,- Active Power, Power Factor, THD = ok- 600V Cat IV = ok- Measurement start at 1W/VA/VAR- Build in current clamp- Single phase- No datalogginghttps://fr.farnell.com/chauvin-arnoux/p01120925/pince-amperemetr-true-rms-600a/dp/2945491https://www.amazon.fr/dp/B00NE2KLAU/

author: French_Nikolas
author_rank: Newbie
timestamp: November 05, 2021, 04:07:13 am
content: You can also considered the F407 (P01120947) from Chauvin Arnoux :- 50Hz AC = ok,- Active Power, Power Factor, THD (with detail of the 25 first) = ok- 1000V Cat IV = ok- Measurement start at 1W/VA/VAR- Build in current clamp- Single phase- Datalogging/Bluetooth built-inhttps://fr.rs-online.com/web/p/pinces-multimetres/7660618/https://www.amazon.fr/dp/B017CM9N1K/But, for the lowest offer, price is slighty higher than 500€ all taxes included (565 € TTC)

author: KaneTW
author_rank: Frequent Contributor
timestamp: November 05, 2021, 02:50:53 pm
content: Thank you, the F407 is perfect. I found an offer for 390 excl. VAT.
Fluke 23 vs. 77 ? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: November 04, 2021, 08:17:49 pm
content: What is the difference between Fluke 23 (Series I) and Fluke 77 (Series I) multimeters?What is the difference between Fluke 77 and Fluke 77 / AN multimeters?Are those Fluke multimeters True RMS?
Tool for SPI decode and history capture  - Page 1
Forum section: electronics / testgear

author: dige
author_rank: Contributor
timestamp: November 02, 2021, 06:49:31 pm
content: Hi,I am wondering what is the best tool to get a real time SPI decode and a history of SPI frames? Each frame has only 1-8 bytes of data max, the SPI clock is 1 MHz. I have a SDS 1104X-E I am trying to accomplish this with. SPI decode works sometimes and disappears at other times. The history function worked successfully with one hard ware setup, I captured 30 frames of data. With another piece of hardware, the same settings for history gathers no more than 2 frames of data. I need answers to these inconsistent behaviors. I am being given dates to resolve this.Thanks.

author: ataradov
author_rank: Super Contributor
timestamp: November 02, 2021, 07:00:32 pm
content: Use a separate logic analyzer.

author: dige
author_rank: Contributor
timestamp: November 02, 2021, 07:25:12 pm
content: Do you have a recommendation for one that I can lookup? I was given a couple of tips for the SPI decode display that seem to be helping with the Siglent. I do need to understand why I can't capture as many frames as I should be able to with the history feature.Thanks,

author: Fungus
author_rank: Super Contributor
timestamp: November 02, 2021, 07:55:32 pm
content: The Siglent should be able to do that.How are you triggering it? Are you using segmented memory?Over to Tautech....

author: ataradov
author_rank: Super Contributor
timestamp: November 02, 2021, 07:56:31 pm
content: Those thingshttps://www.ebay.com/itm/362988658580are all over the place. They work with the official Saleae software or with free and open Sigrok software. It is 1000 times better than any decode on a scope.

author: voltsandjolts
author_rank: Unknown
timestamp: November 03, 2021, 09:23:40 am
content: Like ataradov says, a PC based logic analyser is often a more pleasant experience.Sometimes I prefer the Keysight MSOs though, just if there is an intermittant fault, because they have segmented memory and a pattern trigger. So you can capture specific events/address accesses over a long period. You can do this with PC analyser also, but you have to capture continuously (on the cheaper LA's anyway) then trawl through the MB/GB of data later, if looking for intermittant faults.

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: November 06, 2021, 01:11:36 pm
content: Good Day,I can recommend Ikalogic's inexpensive SQ200 logic analyzer:https://ikalogic.com/sq-logic-analyzer-pattern-generator/Features adjustable thresholds for low/high logic levels and Protocol based triggering.Overall, I like their GUI. The SW comes for free with many protocol decoders included.https://ikalogic.com/scanastudio/scripts/And an API is provided and actively supported by the manufacturer.Cheers,THDplusN_bad
Newbie-Bought a USED Siglent SDS1202X-E Oscilloscope, needs calibration? - Page 1
Forum section: electronics / testgear

author: arun4444
author_rank: Newbie
timestamp: November 04, 2021, 09:32:18 am
content: Newbie, Just Bought a USED Siglent SDS1202X-E Oscilloscope, and the square wave on it (see attached image) is not perfectly square do you guys think it needs calibration?

author: tautech
author_rank: Super Contributor
timestamp: November 04, 2021, 09:39:31 am
content: Welcome to the forum.The probe is not perfectly compensated, that's all.Ensure the probe and input attenuation is set to 10x then expand the timebase to get a longer top and adjust the trimmer in the probe to have it as flat as possible.Rinse and repeat with the other probe.

author: CharlotteSwiss
author_rank: Frequent Contributor
timestamp: November 04, 2021, 10:02:05 am
content: Quote from: arun4444 on November 04, 2021, 09:32:18 amHi,If you need to learn how to use it, look at my topic (I would say from page 8 onwards...)https://www.eevblog.com/forum/beginners/what-an-oscilloscope-recommended-for-a-woman-passionate-about-electronics/Every secret of the 1202x-e will be revealed ... (probe calibration included)

author: arun4444
author_rank: Newbie
timestamp: November 04, 2021, 11:15:12 am
content: Thanks! will try out! bookmarked the post also. thanks for being so helpful.
HP1725A trace disappears - Page 1
Forum section: electronics / testgear

author: wklein
author_rank: Newbie
timestamp: May 20, 2015, 07:59:12 pm
content: Hello All,The trace on my 1725A can appear for awhile by depressing the beam finder button (not always), then gets intermittent, then disappears. It is always visible with the BW switch depressed halfway, so I assume the CRT is OK. Any ideas would be greatly appreciated.Much thanks for your consideration!

author: GreyWoolfe
author_rank: Unknown
timestamp: May 20, 2015, 08:26:04 pm
content: As everyone says here-the first rule of troubleshooting is thou shalt check voltages and ripple. Start with the power supply and work forward. Look for bulging/leaking capacitors. You can get the service manual here:http://www.pa0esh.nl/wordpress/?wpfb_dl=263Good luck with the repair and photos are always appreciated.

author: wklein
author_rank: Newbie
timestamp: May 20, 2015, 08:58:31 pm
content: I have no other scope & just use this mostly to work on my guitar amps. Do you know anyone in the L.A. area that might take this on for less than an arm & a leg? Thanks again.

author: wklein
author_rank: Newbie
timestamp: May 21, 2015, 01:46:24 am
content: Greywoolfe, thanks for the tip & schematic, you were correct, the power supply caps are tired enough to cause that problem. I went at the larger ones most likely to dry out with my Heathkit IT-11 & tried to re-form them, didn't do much, but then left the scope on for a few hours with the trace turned down & it came back to life! Voltage check next & re-cap at least the worst offenders.Thanks again.

author: GreyWoolfe
author_rank: Unknown
timestamp: May 21, 2015, 11:45:55 am
content: If you are going to recap the worst offenders, might as well just do them all. There is no sense diving in twice.

author: alfon
author_rank: Newbie
timestamp: November 05, 2021, 10:40:37 pm
content: "You can get the service manual here:http://www.pa0esh.nl/wordpress/?wpfb_dl=263"This link is now dead, but the manual can still be found - this time in the Keysight site:https://support.keysight.com/s/?language=en_US. just enter 1725A in the search box and you should get the link to the manual.