hybridfree/eevblog-posts huggingface dataset:
I smell a rat! The Rat Sniffer XLR Cable Tester - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: March 21, 2019, 03:04:11 am
content: Does anyone have experience with SoundTools - XLR Sniffer/Sender Cable Tester affectionately known at "The Rat Sniffer"?https://www.ratsoundsales.com/p/soundtools-xlr-snifsend.htmlI have an installed snake that I suspect has a few bad XLRs. I like the fact that this test has a send and receive unit so I can use it on stage and at the mixer.Has anyone used this cable checker?

author: GLouie
author_rank: Regular Contributor
timestamp: March 21, 2019, 05:08:28 am
content: I've had one for a long time, since Audio Control Industrial was making them for Dave and marked as such. It works fine, but I also have regular cable testers (with 2 connectors). Convenient to carry. It can be a bit hard to find the little 12v battery. I guess they are used in cigarette lighters or somesuch (remember those?). The LEDS are not too bright, nor evenly lit.My biggest complaint is that I can't remember all of the LED codes AND you can flip the unit around and get the LEDs backwards by mistake. I keep several business card sized cheater instructions around.It's nice when you are alone and need to test an XLR run in a big installation, but it's also nice to have a tester that allows wiggling all the connectors and cable.

author: coppercone2
author_rank: Super Contributor
timestamp: March 21, 2019, 04:19:44 pm
content: put an arrow on the display so you know its this side up. I recommend the fluorescent tape from home depot

author: Axtman
author_rank: Regular Contributor
timestamp: March 21, 2019, 04:27:55 pm
content: I went ahead and purchased the tester. I really need to figure out the venue's snake before my gig on Monday. It if works it will be cheap aspirin for all the headaches we have been having. I will let you know next week how it goes with the tester. Thanks!

author: GLouie
author_rank: Regular Contributor
timestamp: March 21, 2019, 04:59:26 pm
content: Quote from: coppercone2 on March 21, 2019, 04:19:44 pmYs, I put a locator dot on mine, but eventually I forget if I put the mark on the top or bottom, and I still forget the "codes" of the 3 LEDs. For me, the cheat card is essential.Also, the bicolored LEDs can make adjacent LEDs glow dimly, making me confuse the reading in dim light. The LEDs are not very bright to begin with.

author: AudioPro44
author_rank: Newbie
timestamp: March 21, 2019, 06:17:58 pm
content: The XLR Sniffer/ Sender comes with a color code LED sticker sheet. I just stick it on my sender so I never loose it.

author: GLouie
author_rank: Regular Contributor
timestamp: March 22, 2019, 02:16:31 pm
content: OP's link page also has a link to their page of little cheat cards for printing.
Keithley 2015 - "No Comm Link" - Help - Page 1
Forum section: electronics / testgear

author: letron
author_rank: Newbie
timestamp: March 19, 2019, 12:51:04 pm
content: Hello,I own a KEITHLEY multimeter 2015.When I turn it on, it shows me the following message:"No Comm Link"and hangs.It is impossible to use itIs it a serious breakdown?can you help me ?thanks in advanceAlain

author: Kean
author_rank: Unknown
timestamp: March 19, 2019, 03:48:49 pm
content: Reasonably common problem as evidenced by a google search on your topic title keywords9 results on EEVblog forums alone with plenty of infohttps://www.google.com/search?q=Keithley+"No+Comm+Link"+site:www.eevblog.comAnd also described in the Keithley service manuals for other models (didn't search for a 2015 service manual)

author: coromonadalix
author_rank: Super Contributor
timestamp: March 19, 2019, 08:51:01 pm
content: taken from a 2001 repair : at xdev's :https://xdevs.com/fix/kei2001/#digfailHangs/No comm link error after warm-upTwo of repaired meters had issue related to digital section. After initial warm-up, which took 15-30 minutes, meter’s digital circuitry hang, not responding to any keys. After power cycle meter was unable to boot, and front panel had just “No comm link” message displayed. This happening when main processor unable to send any commands to display board MCU.I checked power supply on digital board, which is only +5VDC from separate transformer winding, rectifier bridge, it was all fine. All electrolytic capacitors were replaced before hand, so it’s not them.Issue on one unit was discovered to be bad NVRAM chip, Dallas DS1245Y. It was one of the chips bought from eBay, and with removal of memory option (leaving socket empty) – 2001 had no more issues even after 24 hours of operation. As DS1245Y is sitting on same memory bus as main SRAM and ROM, if it have intermittent faults it could corrupt processor data bus causing hangs.

author: letron
author_rank: Newbie
timestamp: March 21, 2019, 09:13:30 am
content: HelloThank you for this informationIn fact I have already viewed these pages that I found very interestingHowever, they only talk about the K2001 modelI have not found information on the model k2015We never talk about the firmware update for the 2015 (does it exist?)Can you use the firmware of the 2001 model with the 2015 model?If you could inform me on this point it would be very nicethank youAlainPs: I contacted Tektronix France, they offer me to fix the device for 1 600.00 euros (1 730.00 dollars!) Too expensive for me!

author: coromonadalix
author_rank: Super Contributor
timestamp: March 21, 2019, 10:27:50 am
content: QuoteDamn at this price get a new one, loll wtf ?? I think they will sent you a refurbished one, maybe calibrated too

author: Kleinstein
author_rank: Super Contributor
timestamp: March 21, 2019, 12:30:45 pm
content: The K2001 is a quite different meter, in many aspects older than the 2000 or 2015, in some aspects more like the old brown case 3 digit number models. So there is only limited similarity.
Sencore DVM-32 multimeter - Page 1
Forum section: electronics / testgear

author: xxx2fan
author_rank: Contributor
timestamp: March 21, 2019, 01:00:07 am
content: Does anyone have any information on this multimeter can find DVM38 but not the DVM32. If you have anything I sure would like to get the information, manual, schematics. I am looking to cal the meter at this time and don't know what each pot does.Thanks in advance for any help
Fluke 28II battery cover and compartment - Page 1
Forum section: electronics / testgear

author: ytech15
author_rank: Contributor
timestamp: December 05, 2015, 05:25:04 pm
content: Hey,So it was about time to change the batteries in my fluke 28ii. while doing it... I saw couple things that made me concern about...first when I removed the batteries, I have noticed a hole in the battery compartment (attached photo), I saw Dave's review and I noticed there is no such hole on the one he tested... as well mine has Torx screws and not Phillips head...and the next thing I noticed after applying the battery cover is that the cover is a little bit bulging (attached photo)..So are those things normal?Thanks

author: ModemHead
author_rank: Frequent Contributor
timestamp: December 05, 2015, 09:49:13 pm
content: The bulging 28-II battery cover issue has been discussed here before:https://www.eevblog.com/forum/chat/fluke-28ii-battery-compartment-bulge-normal/

author: ytech15
author_rank: Contributor
timestamp: December 06, 2015, 06:06:27 am
content: Quote from: ModemHead on December 05, 2015, 09:49:13 pmGreat info,ThanksSent from my iPhone using Tapatalk

author: retiredcaps
author_rank: Super Contributor
timestamp: December 06, 2015, 06:43:25 am
content: The Fluke 28 II also has this other potential problem ...https://www.eevblog.com/forum/testgear/fluke-28-ii-battery-life/

author: ytech15
author_rank: Contributor
timestamp: December 06, 2015, 06:49:02 am
content: Quote from: retiredcaps on December 06, 2015, 06:43:25 amThanks, mine doesn't have thus issue, I saw that most of meters that had this problem were made before mine...

author: ytech15
author_rank: Contributor
timestamp: December 06, 2015, 05:28:33 pm
content: Should I send fluke an email about the hole in the battery compartment? Did any one noticed it on his meter?

author: retiredcaps
author_rank: Super Contributor
timestamp: December 06, 2015, 11:16:47 pm
content: Quote from: ytech15 on December 06, 2015, 05:28:33 pmIf you bought it new from an authorized dealer, I wouldn't worry too much about it. Fluke makes revisions/changes to their multimeters all the time.

author: ytech15
author_rank: Contributor
timestamp: December 07, 2015, 06:08:51 am
content: Quote from: retiredcaps on December 06, 2015, 11:16:47 pmIs Amazon authorized dealer?

author: Marco1971
author_rank: Contributor
timestamp: March 20, 2019, 08:19:09 am
content: Quote from: ytech15 on December 06, 2015, 05:28:33 pmHi, my Fluke 28II made in the USA in September 2018 does have that "hole" in the battery compartment and bulge after battery change (from Energizer Alkaline out of the box to Energizer Lithium).Marco1971
Rackmount alternatives for Siglent gear - Page 1
Forum section: electronics / testgear

author: vtwin@cox.net
author_rank: Regular Contributor
timestamp: March 19, 2019, 01:34:26 pm
content: I'd like to rack mount some of my siglent gear to save workbench space... but the rackmount kits sold by siglent seem hideously expensive compared to buying, say, a 19"x6" 'shelf' for considerably less off Amazon.... only issue there is the gear really isn't secure, it's just setting on a shelf...wondering if anyone has concocted an alternative or has any ideas.

author: nctnico
author_rank: Super Contributor
timestamp: March 19, 2019, 01:49:02 pm
content: Tie it with a strap.

author: DaJMasta
author_rank: Super Contributor
timestamp: March 19, 2019, 03:54:59 pm
content: How secure does it need to be? If they sell rackmount hardware, then there should be mounting points, it's just a matter of making up a bracket and buying some screws if you want a really solid mounting. I don't know if I would require especially sturdy mounting for a home lab, so a shelf as long as it can't slide super quickly (provided it's a slide-out shelf) would probably be fine alone if there were decent no-slip feet on the equipment. Wouldn't stand up to an earthquake, though, so maybe in some areas that woudn't do.A strap would work too, if you perforated your rack shelf a couple of times, you could just use rope as well.

author: tautech
author_rank: Super Contributor
timestamp: March 19, 2019, 07:18:38 pm
content: Prices are not excessive for rackmounts that secure expensive and/or heavy equipment.They vary from $129 to $155.https://store.siglentamerica.com/product-category/accessories/carrying-cases-and-rackmounts/

author: tautech
author_rank: Super Contributor
timestamp: March 19, 2019, 09:43:41 pm
content: If it's just security against falling or toppling from a rack, could you adapt a bracket to attach to the Kensington lock ?

author: tautech
author_rank: Super Contributor
timestamp: March 19, 2019, 10:09:16 pm
content: What about these @ a few $ each:https://www.aliexpress.com/item/10PCS-Laptop-Security-Lock-with-4-Digit-Combination-Passcode-for-Kensington-Slot-Security-Anti-Theft-Freeshipping/2054600104.html?spm=2114.search0104.3.21.286b7143Kpu1E5&ws_ab_test=searchweb0_0,searchweb201602_1_10065_10068_10547_319_10059_10884_317_10548_10887_10696_321_322_10084_453_10083_454_10103_10618_10307_537_536_10902,searchweb201603_70,ppcSwitch_0&algo_expid=0e82e078-60e3-4a5a-836a-c31f63766a9d-3&algo_pvid=0e82e078-60e3-4a5a-836a-c31f63766a9d&transAbTest=ae803_4Then terminate them short.
TRIO LA-1910 GP-IB Bus Analyzer Operators Manual - pages 4-5 are missing - Page 1
Forum section: electronics / testgear

author: pez
author_rank: Contributor
timestamp: March 19, 2019, 09:44:30 pm
content: Hello.From all manual copies I found ofTRIO LA-1901 GP-IB Bus Analyzer Operators Manual,the pages 4 and 5 are missing, e.g. the one you can download from here:https://www.schematicsunlimited.com/t/trio/trio-la-1910-gpib-bus-analyzer-operators-manualCould you, please, help me to find these missing pages?Sincerely,pez
VISA command for checking device setting limits - Page 1
Forum section: electronics / testgear

author: Mattjd
author_rank: Regular Contributor
timestamp: March 19, 2019, 02:56:32 pm
content: Hi,I'm writing Matlab drivers for Rigol gear I own. I'm starting off with the DG1022Z. I've been reading through the datasheets, trying to figure out a way to best start. Ideally I would like to write a driver that would work for the entire DG1000 series, as they all use the same commands. One thing I noticed is the limits for various settings per device.For example per device, the following signals have these rangeshttps://imgur.com/a/2dqSO5HI was wondering if there is a command that is able to query the device and determine what those limits are? I've been reading through the IEEE 488.2 commands and SYSTEM commands foundhttp://int.rigol.com/File/TechDoc/20161108/DG1000Z_ProgrammingGuide_EN.pdfI don't see any commands that jump out. So my alternative was to use the event status register and enable status event command,query event status register, and operation complete commands. I'm slightly confused on how to use them though.Do I have to tell the event status register what to track? If so, does someone know where the register and its byte fields definition is? Like what values refer to what? I'm unable to find it.edit: one of the big things I'm aiming towards is some built in protection for device settings. Like I want my code to throw an error if I try to set a sine wave above the specified limits for the device, I just don't know the best way to go about doing that with hard coding it all. I'm hoping maybe the device can give me some info.

author: jmw
author_rank: Frequent Contributor
timestamp: March 19, 2019, 03:41:56 pm
content: The IEEE 488 common commands are not device specific- they are the standard committee's view of things that ought to be there naturally on any device. When they don't map to actual capabilities and properties of a device, they may not get a faithful implementation.You can try setting a frequency that's not possible and see if *ESR? returns some indication that the operation doesn't succeed, but that register seems to be underdocumented. Or you can go the easy route: parse the output of *IDN? and map the model number to a table of allowed values from that spec sheet, and have your driver validate requests before sending them to the device.

author: Mattjd
author_rank: Regular Contributor
timestamp: March 19, 2019, 04:59:13 pm
content: That's very unfortunate, thank you for response. I will try out those suggestions.

author: genghisnico13
author_rank: Regular Contributor
timestamp: March 19, 2019, 05:05:21 pm
content: You could use the source of sigrok to have the relevant data of the most common models or maybe even using sigrok to download the data could be simpler?
Siglent SSA-3021x - What storage case/box have you found? - Page 1
Forum section: electronics / testgear

author: nealix
author_rank: Regular Contributor
timestamp: March 18, 2019, 07:22:18 pm
content: I just purchased the Siglent SSA-3021x spectrum analyzer, and it is 16 inches wide.I roamed around The Container Store and Target but can't find a plastic box or tubthat size to store it in when I am not using it.What type of hard case or plastic storage tub, or pelican case, or whatever,have you found that this Siglent unit can be stored in when not in use?Thanks,Neal

author: tautech
author_rank: Super Contributor
timestamp: March 18, 2019, 07:31:32 pm
content: Siglents bag that fits the SSA and SVA is a good but not overly cheap option and I keep and transport my SSA and SVA in them.https://store.siglentamerica.com/product/bag-scc-soft-carrying-case/They are well padded and offer good protection while you have them on your person.I wouldn't ship one in them though.

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: March 19, 2019, 01:42:44 am
content: If you want a hard case like those bird ones, look at SKB cases.If you want basic storage and transport protection (not shipping), try a flight or catalogue case with some foam for fitting. Leather, nylon on frame or hardboard. I've found them to accommodate a remarkable variety of equipment, and easy to sling or hand carry. Second hand stores or office supply centres.

author: Gregg
author_rank: Super Contributor
timestamp: March 19, 2019, 02:06:40 am
content: About three years ago I bought a video camera soft case that would fit at thrift store, cost me $6 and was in great shape. The older semi-pro camcorders were about the correct size. If you want a hard case, Amazon occasionally has Pelican cases on sale at quite reasonable prices, but if you go to the Pelican website, find the model that will fit and search ebay, you might get lucky and find one near you.
MSO5074 serial decoder possible bug? - Page 1
Forum section: electronics / testgear

author: diegogmx
author_rank: Contributor
timestamp: March 17, 2019, 04:03:59 am
content: Either i'm completely confused about the polarity settings of the rs232 decoder or the scope has it backwardsi know this is pretty basic, but this is too basic for a bug, maybe i'm interpreting something wrong?

author: ataradov
author_rank: Super Contributor
timestamp: March 17, 2019, 04:36:17 am
content: This is a correct polarity for RS-232, but not for UART. But the protocol name says RS-232, so it is ok.I don't think that polarity icon should be read literally. This one just means "positive" in a sense "not inverted" compared to the normal for the protocol.

author: diegogmx
author_rank: Contributor
timestamp: March 17, 2019, 04:50:27 am
content: i think i figured it out, the logic is still inverted, however the idle state does change, so the detection of the start bit changes

author: ataradov
author_rank: Super Contributor
timestamp: March 17, 2019, 04:56:10 am
content: What logic is inverted? The idle state for RS-232 is -3 V to -25 V (often -12 V is used). So this decoding is correct for non-inverted (as configured) polarity.

author: diegogmx
author_rank: Contributor
timestamp: March 17, 2019, 05:09:36 am
content: you set the threshold in this case, it's not the standard rs232 (it should say uart rather than rs232), in this case it was set at about 2v

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: March 18, 2019, 08:51:04 pm
content: I was just reading the user's manual today and came across this topic on page 11-9, apparently the polarity icon is "negative" in Rigol's interpretation. I would agree the icon is somewhat confusing and backward.Quote from: ataradov on March 17, 2019, 04:36:17 am

author: ataradov
author_rank: Super Contributor
timestamp: March 18, 2019, 09:25:09 pm
content: The polarity icon is correct for the protocol. RS-232 looks exactly as shown on the icon. It would be better if they just wrote "inverted" and "non-inverted".

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: March 19, 2019, 01:45:04 am
content: X2Quote from: ataradov on March 18, 2019, 09:25:09 pm
R&S SM300 Low Output - Page 1
Forum section: electronics / testgear

author: K1JOS
author_rank: Regular Contributor
timestamp: December 31, 2017, 02:06:26 pm
content: Just got a R&S SM300 and find the output is down about 50-55 dBm across the range of frequencies. It's a bit weird.. as I have a clean signal from -80 dBm up to -26 dBM although the signal is off by about -10 dBM. But when I change the level from -26 to -25 the output just disappears completely. The service manual is useless as it says to change module. Sound like the final PA is shot and its working on preamp power only but I cannot find any schematics.I see R&S in USA has a flat fee policy - I'm sure that will be expensive.... does anyone know of a reputable and reasonable repair center in USA?Jerry NY2KW

author: peertux
author_rank: Contributor
timestamp: March 18, 2019, 01:19:32 pm
content: Did you ever find a solution I'm having a similar problem.
HP8594E - Cooked display board - Page 1
Forum section: electronics / testgear

author: Ice-Tea
author_rank: Super Contributor
timestamp: March 20, 2019, 01:08:01 pm
content: So, yeah, that didn't smell too well:Unit turned on, display had a trace doing all sorts of funky moves but not much else. That resistor is well and truly cooked. I doubt it's just that, though, so I don't imagine simply replacing it would do the trick. So, does anyone have the schematics? Found the assembly level service guide and I actually found schematics for *a* display module for it (Panasonic) but the tube in mine is Philips. And they only seem to share a formfactor...So? Schematics? Or is there perhaps an LCD retrofit option? Pointers?

author: MarkL
author_rank: Unknown
timestamp: March 20, 2019, 05:31:04 pm
content: Attached is a schematic that purportedly is for some of the CRT models in the 859x series. I don't remember where I got it.The part IDs don't match your board, but you have a few components in the right place, such as the TDA118xx, the MPSU07, the big 1k 3W resistor, and the 220 ohm resistor connected to the yellow lead which is probably "R SCKT" on the schematic, and at least one zener in the area connected to GND.If anything, maybe the schematic is similar enough that it can help. If not, I think I would start with checking Q4 and/or start looking at components attached to the cooked resistor.

author: TurboTom
author_rank: Super Contributor
timestamp: March 20, 2019, 07:24:34 pm
content: It's well possible that the burnt resistor resembles R230 (22 Ohm) in @MarkL's schematic and it failed since the tantalum cap C10 (which would match C220 in the schematic) shorted out. You may check this by testing resistance between pins 1 and 16 of the TDA1180. If it's low, remove C10 and check again. If it is higher now, replace C10 and the burnt resistor and you should be ready to go. Just my 2 cents...P.S. The profane reason for the fault could also be too high a supply voltage from the main PSU. May be a good idea to check that first.

author: Ice-Tea
author_rank: Super Contributor
timestamp: March 21, 2019, 09:06:00 am
content: Well, some fun avenues to exploreThanks for the input. Will update when I have more...
TDS754D  ++processor failed - Page 1
Forum section: electronics / testgear

author: fisafisa
author_rank: Regular Contributor
timestamp: March 17, 2019, 08:08:04 pm
content: HiMy TDS754D has developed a fault and reports that the PROCESSOR tests fail.This normally indicates failure in the NVRAM.Using the tektool I have started checking the NVRAM .It seemed that some values at the top of the 0x400000 section were changing between boots.I have then started replacing the 1250Y 512K NVRAM.After some confusing trials I have finally realised that the first 0x20000 bytes belong to the DS1458 and thatthe DS1250Y address overlaps...Taking out the DS1250Y and reading its content with the tl866 I have noticed that address 0x20000 onwards matches with 0x420000 on the scope. Before that only zeroes.So be warned, reading with the tektool and writing with the tl866 will not work as the addresses are mangled.
Agilent E4406A single user mode? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: August 04, 2016, 01:02:11 pm
content: Does anyone know how to use the HP_RT rtboot command to boot to single user mode to change root password?ThanksDave

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: August 04, 2016, 10:15:37 pm
content: Quote from: perdrix on August 04, 2016, 01:02:11 pmNo, but you could always connect a PS/2 keyboard, switch on the VSA, interrupt the boot process, start IPL (enter 'bo pri', then when asked if you want to interact with ISL enter 'Y'), and at the ISL prompt type 'hpux -is', which should boot the system in single user mode. Mind you that this is all from memory from a bygone era when HP-UX was still a thing.Of course, you could always just perform a firmware restore instead, which should reset the root pw.

author: perdrix
author_rank: Frequent Contributor
timestamp: August 05, 2016, 10:29:29 am
content: hpux -is doesn't do it as the boot command is quite different in hp-rtos.I'd got as far a bo pri and dig around to find the actual command to boot the system is rtboot, with a few options specified (like where to find the memory boot image). -is doesn't seem to be an option for the rtboot command.Dave

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: June 27, 2018, 01:07:22 pm
content: Code:root:b00tes:0:3::/:/bin/shDoes this help?Leo

author: RCHRDM
author_rank: Regular Contributor
timestamp: March 20, 2019, 05:53:43 am
content: HelloDoes anyone know the user name and password to access the E4406A? I am trying to connect an FTP client.I cannot find a service user name and password in the service manual.Richard

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: March 20, 2019, 08:51:31 am
content: user name:vsapassword:serviceQuote from: RCHRDM on March 20, 2019, 05:53:43 am

author: RCHRDM
author_rank: Regular Contributor
timestamp: March 20, 2019, 02:48:23 pm
content: Thanks!Richard
Rigol DG1022 external reference - Page 1
Forum section: electronics / testgear

author: Manni
author_rank: Newbie
timestamp: March 15, 2019, 11:13:28 pm
content: Can anybody tell me how to activate the 10 MHz reference input of the DG1022?Thanks,Manni

author: Housedad
author_rank: Frequent Contributor
timestamp: March 16, 2019, 07:59:27 pm
content: These keys:Utility, then System. then Setting, and then Timer. Choose external.Hook up the external 10mhz source and you are good to go.All this is in the manual. Read it first.Look for System Settings in the manual.

author: Manni
author_rank: Newbie
timestamp: March 17, 2019, 12:31:23 pm
content: Many thanks. I wonder how i can have overlooked that.
Need uAmp measurement at 200kHz - Page 1
Forum section: electronics / testgear

author: Wimberleytech
author_rank: Super Contributor
timestamp: March 16, 2019, 09:43:53 pm
content: I need something like the uCurrent Gold for a project. Need to resolve 1uA at a minimum at 100-200kHz ish, measured/monitored with a scope.This is low-side sensing also.No place I have found in US to get the uCG...sure I could build it but I am in a hurry. I found Cmicrotek but $700 is more than I want to pay if I can avoid it.Any suggestions?

author: Gyro
author_rank: Super Contributor
timestamp: March 16, 2019, 09:52:22 pm
content: If it's low-side sensing, and hopefully not mains related, then why not simply measure the voltage drop across a shunt resistor with a scope.You haven't indicated what burden voltage you can tolerate, or the magnitude of current that you want 1uA resolution on.

author: Wimberleytech
author_rank: Super Contributor
timestamp: March 16, 2019, 10:10:09 pm
content: Quote from: Gyro on March 16, 2019, 09:52:22 pmUsing a series resistor is my backup plan (in series with the output collector of an opto and a smps chip), but am willing/wanting to shell out some cash to get a more elegant solution.

author: pigrew
author_rank: Frequent Contributor
timestamp: March 16, 2019, 11:07:33 pm
content: My solution (at 500 kHz) was to use a current transformer (Coilcraft) with a high-resolution oscilloscope. In my case, we only were interested in CW, and were able to characterize our transformer/oscilloscope at a small set of frequencies. It seemed stable enough versus temperature. I was sure to keep the oscilloscope in a fixed range.
Cross-platform Screen Capture for RIGOL DS1054Z - Page 1
Forum section: electronics / testgear

author: fearless
author_rank: Contributor
timestamp: March 17, 2019, 09:40:21 pm
content: All:I've just uploaded a simple command line program that lets you do a screen grab from a Rigol DS1054Z 'scope[\*]. Confirmed to run on macOS, quite possibly runs under Linux and Windows (maybe one of y'all could test it for me!).Start here for overview:https://hackaday.io/project/164447-rigol-screen-grabberand/or go directly here for the code:https://github.com/rdpoor/rigol-grabHere's a sample output:[\*] PS: It may well work on other Rigol scopes, but that's not yet been tested.

author: tautech
author_rank: Super Contributor
timestamp: March 17, 2019, 10:37:32 pm
content: https://www.eevblog.com/forum/testgear/open-source-lxi-tools-and-liblxi-v1-0-released-for-gnulinux/
Tektronix 2465B Test 05 Fail 40 repair. - Page 1
Forum section: electronics / testgear

author: MaxFrister
author_rank: Regular Contributor
timestamp: March 15, 2019, 10:36:13 pm
content: This seems to be a common problem so I thought I would report on my repair.Summary:Apparently fixed by replacing the U500 hybrid with a known good one.Details:This is my main scope. In 2015 it received new caps, repaired SMD A5, and new cal. memory. It worked flawless up until a few months ago. At that point it started failing the power on self test with “Test 05 Fail 40” messages.I set the scope aside dreading trying to find what I assumed would be another damaged trace on A5. After a while, I pulled it off the shelf and started testing it. Of course, it passed all self-tests.So I put it back in service and waited for it to fail again. Eventually, it did.This time I carefully measured the power supplies and checked that the DAC was basically functioning. Everything was okay. Before trying to troubleshoot the A5 sample-and-hold circuits I thought I would try an easy experiment. I swapped the U500 hybrid between a 2430A and this scope. Surprisingly, both scopes now work and pass self tests.I don’t have a good explanation as to why this worked (or indeed if it has — only time will tell). Perhaps the hybrid is marginal and the 2430A uses it under slightly different conditions. Perhaps an issue with contacts — although I had already tried cleaning the contacts and reseating it.
Recent SDS1104X-E Owners, how old is your scope?  - Page 1
Forum section: electronics / testgear

author: Coldblackice
author_rank: Contributor
timestamp: March 13, 2019, 07:19:27 pm
content: I bought an SDS1104X-E from Saelig that I just received, but am a bit dismayed to see that it was calibrated over 6 months ago, for one, but also meaning it's a scope that's at least a half-year old or more. Not at all trying to be petty, but as it was a really big purchase for me (and my laughably pittance finances) I'm a little bit bummed as I was anticipating it would be newer and more recently calibrated than that. I think it also doesn't help that there was also a moderate sized hole punctured through the shipping box, though I'm assuming that's UPS' fault.For any that have purchased an SDS1104X-E, how old is yours and how far back from your order date was it calibrated?

author: tautech
author_rank: Super Contributor
timestamp: March 13, 2019, 08:09:03 pm
content: Siglent USA stocked up big time on these before the Trump taxes came in so you will have one of those.Dunno if later shipments will increase in price for you US guys.I don't think their would be any calibration drift if it was sitting in a warehouse and unpowered and anyway, normal shipping to the US is gunna be a couple of months plus any time before sale lost on the Cal cert.How do I know, well factory lead times took a jump while they filled the US order so I had to wait another week or two for stock I ordered.

author: MikeLud
author_rank: Regular Contributor
timestamp: March 13, 2019, 08:44:17 pm
content: I just received my SDS1104X-E from Saelig last week and it had a calibration date of October 8 2018Mike

author: tek2232
author_rank: Contributor
timestamp: March 14, 2019, 07:20:42 am
content: I got mine in october last year , calibrated date is Jun-20-2018.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: March 14, 2019, 04:38:10 pm
content: That’s a great point, six months ago, SIGLENT had to hedge against a 10% tariff on 9/24, and a possible 25% tariff in 2019. Had they not done that, the increase would have hit our local price and we could pay all 10 or 25% price hike out of our pocket to Uncle Sam. If the trade talk breaks down, we may still see the price rises to $625 in future import.Sad part is, what are our choices to buy scope not made in China at that price. Perhaps finding a 30+ years old tired gear on eBay that may not work? We’ll have a lot to worry about than cal cert with those vintage test gears. Instead of working on new projects, our test equipment becomes our project.Quote from: tautech on March 13, 2019, 08:09:03 pm
Tek 2440 - analog like? - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: March 15, 2019, 04:51:55 pm
content: A guy has a Tek 2440 for $50. Looks in good shape. I know the 2440 is a 500MS/S sampling scope, but does it present like some of the others where they are analog unless you hit the storage button? I had a very early Tek storage scope that was analog unless you captured the signal and stored it. I like having an analog scope for looking at modulation envelopes. I have an 11301 that I can't get working, someday I might dig into it again, it has a timing problem with the display. I think the 11301 also has rom rot or something as its not saving the settings. Anyway, I thought for $50 bucks I would take a look at this and maybe send it to my brother to replace the other earlier one I sent him as well.Thanks,Jerry

author: LazyJack
author_rank: Frequent Contributor
timestamp: March 15, 2019, 08:33:23 pm
content: It is fully digital. No analog path to the display at all. I think it is a good scope. I use mine regularly. Only drawback is the loud fan. Some of its specs are good even today, like glitch capture. Some, like memory length are not.You can expect two problems. PSU caps, they are easy to replace. NVRAM battety, also simple to fix.

author: cncjerry
author_rank: Unknown
timestamp: March 15, 2019, 10:13:42 pm
content: Your comments on the analog aspect of the scope, or lack thereof, sort of turns me off on it now. As I mentioned I had another one that displayed an analog trace until you hit the storage button and then it presented a sampled copy of the signal. But it is for my brother and it's better than what he has now.I've been checking them out the past two days and they seem like an interesting scope but I have so many scopes now even my wife thinks everything is an oscilloscope.
The H24005 power suppply and a lightning strike - Page 1
Forum section: electronics / testgear

author: AlanS
author_rank: Unknown
timestamp: March 15, 2019, 01:52:35 am
content: About 5 weeks ago during a fairly nasty fire season in Victoria we were also hit by a series of lightning strikes. One came close to our house.It appears that current travelled up through the earth leakage device on the switchboard and took out all sensitive earthed appliances. All two pin appliances survived.The same switchboard feeds another switchboard some 70 metres away in my workshop. The H24005 was connected. When doing the damage assessment I came to the H24005 with 2 blown fuses, replacement of the fuses saw the new earth leakage device (yes it blew too) trip again.To make a long story short, replacement of the 2 TVS devices (and 2 more fuses) saw my baby come back to life. I suspect also that the H24005 sacrificing itself may well have saved other appliances in the workshop. Thankyou Prasimix.Does anyone think I should also replace the MOVs too?

author: Clint_dk
author_rank: Newbie
timestamp: March 15, 2019, 04:57:04 am
content: A MOV generally degrades as it absorbes each power surge. So if in doubt on how much lifespan is left in them, just change them out.
DSO5102P, 2 channels connected, possible AutoSet for 1 channel? - Page 1
Forum section: electronics / testgear

author: gtr
author_rank: Contributor
timestamp: March 14, 2019, 03:01:11 pm
content: Hello everyone,On my DSO5102P, when my two channels are connected to the oscilloscope and each channel to a source. If I turn off channel 2 and do an AutoSet, channel 2 turns back on. It is therefore an AutoSet for the 2 channels. I have disconnected channel 2 from the source or oscilloscope to make an AutoSet for a single channel.Is it possible to make an AutoSet for a single channel when both are connected?Thank you!
Impo D-5 oscilloscope, does anyone know anything about this? - Page 1
Forum section: electronics / testgear

author: triagon
author_rank: Newbie
timestamp: March 14, 2019, 06:19:13 pm
content: Hi everybody,First of all, since this is my first post on the forum I hope this is the right section for my topic.Some pictures:https://imgur.com/a/HAL1K4GI recently grabbed this thing for 5€(about the same in $) from my university's student-run electronic workshop's garage sale.It lacks BNC connectors, all connections are done with banana plugs.The controls are very bare-bones; there isn't a trigger level adjustment, for example, just a dial to select the trigger source.It seems as though it's always using chop to display both channels, I have yet to find a way to view just a single channel or use alt.I did some Google searches but came up dry.The CRT shield has 26/9/1974 date on it, so that's the approximate age of the scope.My guess is it's an entry level scope used by my university to teach students to use an oscilloscope, that would explain simplicity of the controls, and possibly the use of banana plugs as an input.The scope is working, although quite clearly out of calibration. I just have yet to figure what to use it for given its limited set of features.
HP 8116A Parts needed - Page 1
Forum section: electronics / testgear

author: jlmoon
author_rank: Unknown
timestamp: March 13, 2019, 07:23:26 pm
content: Hello,It has been some time since I have posted on here, the busy lives we live! I have acquired a HP 8116A that needs a front panel / push button assembly. I am restoring this for an extra general purpose function generator. The unit I have is in okay working condition except some of the switches are so badly corroded that it is justifiable to simply replace the entire front control/display. This unit bears the Option 001 (Burst & Logarithmic sweep).I am familiar with the process of reworking the bi-metallic tactile springs but feel these are too far gone. Some of the actual contact switches fail to close as well. If anyone has a donor unit laying around that wants a new home, please contact me.Thanks for your time,Jon

author: MadTux
author_rank: Frequent Contributor
timestamp: March 13, 2019, 10:56:07 pm
content: HiThe trash collector I am, I just happen to have a bare HP8116A PCB assembly lying around.The rest of the 8116A was scrapped/sold in parts years ago, due to bad ASICs, but I somehow kept the front assembly, mostly because of the LED segments might also be useful for other HP instruments.Switches were reclaimed to repair other HP instruments, but PCB is in mint condition.Cable on the back is cut aswell, but shouldn't be much of a problem soldering that with a heat gun and lots of flux20$+shipping from Switzerland/Germany

author: jlmoon
author_rank: Unknown
timestamp: March 14, 2019, 01:58:39 am
content: Hello MadTux,Thank you for giving me your input. I appreciate your quick response, the front panel you have appears to be the one without the Log / Burst option. I need the one with the extra buttons so it will match up with my firmware and functionality. Again, thank you for making an attempt to keep this old stuff out of the scrap bin. I'm sure there are a few Opt 001 panels out there in the wild.Thank you,
Help identifying kkmoon dso4102c oszi - Page 1
Forum section: electronics / testgear

author: Lucard
author_rank: Newbie
timestamp: March 11, 2019, 11:00:51 pm
content: Hi,I recently bought an oszilloskop on Amazon. Its labled "KKMOON DSO4102S" (2 Channel, 100MHZ, 1GS/s). I am quite sure ist just a relabled oszi.In particular i think its from hhe DSO4xxxC Series from Hantek. They looks exactly the same, have identical accessories and very similar specs. Also the Layout on the Main PCB is very similar.I opened it up and made some pictures of the PCBs.Main PCB is labled "DSO4000C V1.02 2015-03"PSU is labled "DSO5000 SERIES POWER"I also attached the manual, which was on the CD (I couldnt find it on the internet)If you need more pics or want some parts to be identyfied i will do what i can.Why do i ask?I want to know if a bandwith-hack is possible and if its possible to add and use the lan port (next to USB).I would be really grateful if someone can help.Additional Pics and Manual:https://ibb.co/XCJ6YyFhttps://ibb.co/jw7NvVKhttps://ibb.co/PzBcBZrhttps://ibb.co/MRXwxJLhttps://ibb.co/zHGgs4zhttps://docdro.id/rdh8tSn

author: TurboTom
author_rank: Super Contributor
timestamp: March 12, 2019, 09:49:13 am
content: Hantek 4102C...and by the way, welcome to the forum!

author: Microcheap
author_rank: Frequent Contributor
timestamp: March 13, 2019, 04:23:55 am
content: Quote from: TurboTom on March 12, 2019, 09:49:13 amAnd you can even unlock its full bandwidth if you want:https://www.eevblog.com/forum/testgear/upgrading-the-hantek-dso4072c-osciloscope-bandwidth-from-70mhz-to-200mhz/msg2089726/

author: Lucard
author_rank: Newbie
timestamp: March 13, 2019, 10:44:24 pm
content: Thanks for the help.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: March 13, 2019, 10:59:52 pm
content: It's a very good thing that this is a whitelabeled product from a brand of less-ill repute. I've known hantek to make shoddy software, but that's the industry equivalent of going 5 over in the fast lane. Kkmoon, on the other hand, gave me my first le$$on in not using cheap equipment to diagnose expensive products. One of their boost/buck power supplies dumped the intermediate-voltage storage capacitors (relatively high voltage and energy compared to the configured output) straight into my DUT when I turned it off, and I managed to kill two boards before I figured out what was going on
HP3314A Function generator front panel - Page 1
Forum section: electronics / testgear

author: Applemac
author_rank: Regular Contributor
timestamp: March 13, 2019, 08:44:37 pm
content: Hi, I bought an hp3314a function generator which the front panel keys are not in great condition this generator has the soft touch keys. So i bought another for spares this has the frint panel with the hard press keys, my question is are they compatible so i can swap the front panels?
Oscilloscope identification and evaluation? - Page 1
Forum section: electronics / testgear

author: Pexy13
author_rank: Regular Contributor
timestamp: March 13, 2019, 04:09:14 pm
content: Greetings!I'm still hunting down my first scope. I came across this ebay listing but as the buyer saysthe scope's model is not certain. Is this some sort of a copy, scam or is it just a different front cover/plate?If someone has any info about this scope I would be very grateful.Thanks.https://www.ebay.com/itm/Kikusui-Oscilloscope-21A-60MHz-Kikusui-Oscilloscope-COS-5060-A/283411861701?hash=item41fca9d0c5%3Ag%3AGGIAAOSwtNlchRW-&LH_ItemCondition=3000&frcectupt=true

author: Andy Watson
author_rank: Super Contributor
timestamp: March 13, 2019, 04:24:12 pm
content: Looks genuine. I think that little rectangle on the lower left of the CRT bezel would have had the brand name label. Why do you think it is a scam?https://www.radiomuseum.org/r/kikusui_oscilloscope_cos_5060_a.htmlhttps://www.kikusui.co.jp/manuals/index_e.php?GROUP=COS&skip=11I think £40 is a little high.
Tek 547: Ground? What Ground? - Page 1
Forum section: electronics / testgear

author: scuzzyTerminator
author_rank: Regular Contributor
timestamp: March 12, 2019, 06:13:21 am
content: I have a Tek 547 stashed away where it can't easily be checked for awhile.I was browsing a thread about using an isolation transformer for scopes (Bad Thing) and remembered that my old beast has a two prong plug with no earth. I had assumed it is the original equipment - I'm old enough to remember that it would have been hard to find an earthed oulet to plug it into in the early '60s.So I'm wondering what the probe ground reference is supposed to be. Mains neutral? Floating?

author: Jeroen3
author_rank: Super Contributor
timestamp: March 12, 2019, 09:08:33 am
content: Did you check the manual what was delivered with the unit?

author: bd139
author_rank: Super Contributor
timestamp: March 12, 2019, 10:48:06 am
content: AFAIK they came with a 3 pin socket on the back so the earthyness is up to the user to work out. I remember in my short spell in industry, our scopes were ground strapped separately to the mains lead. They were somewhat newer than a 547 though.

author: med6753
author_rank: Super Contributor
timestamp: March 12, 2019, 03:01:05 pm
content: Go back and look at your 547 again. I'm familiar with them and have never seen one that WASN'T a 3 prong plug.Understand that these scopes were almost always in a lab environment. Labs were early to implement 3 wire grounding where as typical US residences built after WW2 and up until the early 1960's were not.

author: scuzzyTerminator
author_rank: Regular Contributor
timestamp: March 12, 2019, 08:53:53 pm
content: Thanks for the replies. I thought someone might have a similar scope for a quick answer or check but it looks like I'll need to dig mine out. That will be awhile.The power cord is two pronged and connects directly to the scope without a receptical. It is worn at the entry showing the two wires within. I had been thinking of replacing it with an earthed cord and assume that I could just put earth to chassis.When I get it out I can check for conduction of chassis with probe ground and mains neutral.This is a '60s model that I bought in the '80s.Thanks again.

author: David Hess
author_rank: Super Contributor
timestamp: March 12, 2019, 09:18:58 pm
content: My stock 547 has a three prong power connection. So does my Lavoie LA-265A which is a clone of the Tektronix 545A.

author: scuzzyTerminator
author_rank: Regular Contributor
timestamp: March 12, 2019, 10:38:26 pm
content: Found manual at:http://w140.com/tek_547.pdfI have a 1A4 plug-in:http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Tek/1a4.pdfThe videos at "Tektronix 547 (Tek 547) Oscilloscope Restoration":https://lazyelectrons.wordpress.com/2018/07/06/tektronix-547-oscilloscope-restoration/are way cool, But he clearly has a 3-pronger.
HP 3325A offset - really puzzled - Page 1
Forum section: electronics / testgear

author: LazyJack
author_rank: Frequent Contributor
timestamp: March 13, 2019, 02:31:33 pm
content: Hi, I'm working on a HP 3325A function gen, and I hit a very puzzling problem.It has an asymmetrical offset problem. Set it to DC offset. From 0 +5V works perfectly, but anything below zero is wrong. -5 goes to -13.7V (without 50ohm termination, with it, half of it of course). Below about -2,5V just simply saturates the output to the negative side.So far what I have ruled out: DAC and S&H - OS2 test point goes perfectly from 10 to -10 as it should when setting the offset from one site to the other. OS1 correctly tracks the offset, if A-CAL is done.Output amplifier is OK, I have measured the current at the AMP-IN test point, and it is perfectly linear over a 4mA range, which according to the SM it should be from 5 to -5 V offset. Output 0 is 1.5mA as it should (1.5mA is the amplifier input bias current, again, according to the SM).However, from 0-5V the current is ok, over a 2mA range, but on the negative side from 0 to -5V the current increases, it spans about 5mA.U38b and Q106 replaced for a test, these generate the -2 to +2 mA offset current. Q113 disconnected to see if the amplitude offset causes it, no.All semiconductors check (with diode testing, so may be parameter problems) in the offset circuit.Problem still persists. The only one I have not yet tested is Q108 dual transistor in the current mirror, it may be out of tolerance??? Only one dual transistor in my unit, it is an older version, as described on page 7-18 of the SM .I'm getting a replacement dual transistor simply to test if it makes any difference, although I'm not convinced that it may be the problem. However, practically nothing else is left to explain this.Any hints of where I I should look?Thanks.