hybridfree/eevblog-posts huggingface dataset:
Help finding Kingsine KS813 software - Page 1
Forum section: electronics / testgear

author: Ario
author_rank: Regular Contributor
timestamp: October 27, 2023, 10:32:18 am
content: Can any one point me to the software or drivers of the KS813. injection set. I seam to be able to send serial commands, to the relay, the commands controlls the injection set. The problem is that there is no response.Any help or info would be greatly appreciated!!

author: coromonadalix
author_rank: Super Contributor
timestamp: October 27, 2023, 11:42:12 am
content: have you done an inquiry athttps://www.kingsin.com.cn

author: Ario
author_rank: Regular Contributor
timestamp: October 31, 2023, 08:41:46 am
content: Not myself, however my colleague did. Their response is slow, and the firmware they send, is not running on windows 10.Thanks anyway!

author: coromonadalix
author_rank: Super Contributor
timestamp: October 31, 2023, 09:42:25 am
content: A firmware or a software ?Would you share it here or a download link ...

author: Ario
author_rank: Regular Contributor
timestamp: November 03, 2023, 08:04:26 am
content: I am sorry, for such a late response.

author: Ario
author_rank: Regular Contributor
timestamp: November 03, 2023, 08:07:53 am
content: I received PC software, but it is too big to share. Kinston does not seem to make their software available through download.
64bit USB Driver for Siglent SHS800 Scope ? - Page 1
Forum section: electronics / testgear

author: killingtime
author_rank: Regular Contributor
timestamp: November 02, 2023, 02:42:38 pm
content: Hi,Does anyone know where I can find the Win7 x64 USB driver for the Siglent SHS800 scopes.Siglent lists this as a discontinued model now, and have removed the driver from their website for some reason.No response from their support.The scope shows up as a SHS806 in Device Manager under Unknown Devices.Siglent have written a document on how to install the driver (link below - covers Win7) but in a stroke of genius, they don't list where the driver can be found.https://www.siglentna.com/USA_website_2014/FAQ/SHS/How%20to%20install%20USB%20Driver.pdfEasyScope will not work without it.Thanks.

author: killingtime
author_rank: Regular Contributor
timestamp: November 02, 2023, 05:20:33 pm
content: Finally found a combination of software that works. For anyone that doesn't want to waste an afternoon, instructions below. This is for Win7 x64.1) If you've plugged the scope into your computer but failed to load the driver (Unknown Device), remove it from Device Manager, then disconnect from USB.2) On the scope, make sure the USB port is set to identify as USBTMC and not a Printer (User button, page 2 of 4).3)Install .NET framework 3.5 SP1 from Microsoft. Needs a reboot.4)Install NI-VISA-5.4Runtimefrom the link below. Needs a reboot.OS drop down: WindowsVersion drop down: 4.5Included Editions drop down: RuntimeIt's a 73MB download.If you go for the Full edition it's a 639MB download, but you don't need this edition.https://www.ni.com/en/support/downloads/drivers/download.ni-visa.html#4946535) Install EasyScopeX – V1.01.02.01.20 (Release Date 06.07.18 ) from the link below.https://www.siglenteu.com/service-and-support/firmware-software/handheld-oscilloscopes/#shs800-series6) Plug the scope in via the USB port. It should grab the correct driver from the software installed above.7) Run EasyScopeX and select your scope: Scope Tab \ Add Device Button \ USBTMC TabIf you follow the above steps it's painless.Couple of pitfalls that threw me:1) There's another version of EasyScopeX on Siglents website which is older, but has a higher version number than the newer release. You need to pick the latest edition above with the lower release number, not the older version with the higher release number. The wrong version will not see the scope, even with NI-VISA installed.2) The older EasyScopeX release comes with x32 and x64 bit signed drivers, but these are not recognised by Win7.3) The document Siglent released above describing the driver installation procedure seems to be for the older EasyScopeX release as this distro comes with .inf drivers, but there's nothing in the document about this. It's a red herring if you're using NI-VISA. The newer EasyScopeX doesn't come with drivers as it relies on NI-VISA.
recommendations for antenna companies  - Page 1
Forum section: electronics / testgear

author: olorenzen
author_rank: Newbie
timestamp: November 02, 2023, 11:21:39 am
content: Hello!I am working at an university and we want to built a new RF lab. For a free space measurement setup we are searching for a suitable company to buy horn antennas with dielectric lenses for frequencies up to 26.5 GHz. Has anyone here made some good experiences with a specific company for a comparable use case or can recommend a company for antennas in general? I would be very thankful for any advice.

author: chriswebb
author_rank: Unknown
timestamp: November 02, 2023, 05:20:31 pm
content: May be helpful to also post in the RF section.

author: DaJMasta
author_rank: Super Contributor
timestamp: November 02, 2023, 06:18:31 pm
content: Are you just crowd sourcing equipment recommendations? You'll probably get some fine replies, but you don't have any leads to go on? No requirements beyond frequency?My advice from the VNA thread is probably still relevant here: there are the long established market leaders who would be good choices, then there are lesser known companies and upstarts which may be able to give you what you want, and if you're looking to just survey the market, going through the exhibitors at an RF trade show would probably give you most of them.
Elenco GF8046 Frequency Generator - Page 1
Forum section: electronics / testgear

author: wclipsham
author_rank: Newbie
timestamp: November 01, 2023, 10:10:40 pm
content: Does anyone have or know where to obtain the circuit schematic for an Elenco GF8046 Frequency Generator? Any help would be much appreciated. I have searched high and low but alas, no prospects. I was able to obtain a copy of an Elenco FG8056 but it is only a user manual and doesn't include the circuit schematic. Surely it must have existed sometime back (not even certain when this was manufactured) Thanks in advance for any help! Bill

author: edavid
author_rank: Super Contributor
timestamp: November 02, 2023, 04:58:27 pm
content: There is a partial schematic in this thread:https://www.eevblog.com/forum/repair/elenco-gf-8046-function-generator/The OP still seems to be active if you need the rest of it.
Simpson 490 493 494 DMM series made in Japan - Page 1
Forum section: electronics / testgear

author: yo0
author_rank: Regular Contributor
timestamp: November 02, 2023, 02:10:20 am
content: hello, anybody know that dmm series? i can't find any info about it.best regardsPio

author: BillyO
author_rank: Super Contributor
timestamp: November 02, 2023, 03:06:19 am
content: Contact Simpson. They are still around.
Measuring the ESR of capacitor with Feeltech FY3200S - Page 1
Forum section: electronics / testgear

author: Pygmalion
author_rank: Regular Contributor
timestamp: October 31, 2023, 11:04:58 pm
content: You have probably heard of the method of measuring the ESR of a capacitor using pulses (https://www.electronicdesign.com/technologies/power/article/21199428/a-simple-method-for-a-capacitors-esr-measurement). The method assumes a constant internal impedance of the function generator.On paper, the FY3200S should actually be a good choice. If you set a square wave of amplitude 10Vpp with an offset of 5V and a duty cycle of 1%, this will give perfect pulses. Although the impedance of the FY3200S should be about 50Ω, with a 10Ω resistor at the output the voltage drops from 10V to only about 1V. This means that the impedance is not constant and can be as high as 100Ω with large loads.Is such behaviour normal for signal generators or is it just the result of using a cheap signal generator? If so, does this mean that the FY3200S cannot be used to measure the ESR of capacitors?

author: Aldo22
author_rank: Super Contributor
timestamp: November 01, 2023, 03:47:21 pm
content: First, I have to say that I am learning, or in other words, I have no idea what I am talking about.But if no one else says anything....I have a FY3224S and a 8.2 Ω resistor and I wanted to check your question.Also, I found a calculator for internal resistance.https://electronicbase.net/de/innenwiderstand-berechnen/#innenwiderstand-online-rechnerSo, I measure a voltage under load (8.2 Ω) of 0.448 Vrms at 3.536 Vrms source voltage (10Vpp).That gives 56.52 Ω internal resistance according to the above calculator.I don't know if it's correct to calculate it this way, but the result seems halfway reasonable.However, the waveform suffers a bit at 8.2Ω.I think that a limit is soon reached anyway.The question is what you expect or what can be expected.Please correct me if I am wrong.

author: Pygmalion
author_rank: Regular Contributor
timestamp: November 01, 2023, 08:44:03 pm
content: Quote from: Aldo22 on November 01, 2023, 03:47:21 pmYour calculation is correct. If I use approximately the same conditions 10Vpp, 10Ω, I get an internal resistance of 58Ω.However, if I use 20Vpp, the internal resistance increases significantly to 92Ω. Can you repeat the process with 20Vpp?

author: Aldo22
author_rank: Super Contributor
timestamp: November 01, 2023, 10:40:26 pm
content: Quote from: Pygmalion on November 01, 2023, 08:44:03 pmYes, I measure that too.But I don't have enough experience to draw conclusions from it.I also don't know if "better" signal generators behave differently in this point.
Building a RF free space measurement and a waveguide setup  - Page 1
Forum section: electronics / testgear

author: olorenzen
author_rank: Newbie
timestamp: November 01, 2023, 08:19:32 am
content: Hello again!I am doing a internship at the RF department of an university right now and got the following task today. I have to research on how to build two measurement setups for microwave measurements or respectively material measurements. The first setup should be a free space measurement system with two horn antennas for 1 to roughly 26 GHz with the option to change the angle of the antennas. I saw that there are systems using an arch for such an angle change and other use a table with a rotational axis for one of the antennas. The other setup should be a waveguide measurement setup for a bandwidth up to 20 GHz. When it comes to the budget I got the guideline that the free space measurement setup should cost not much more than 100k $.I could really use some help/expertise for this task. Especially on which specific horn antennas I could use, which cables are suitable for this kind of setups, any tips on the construction of those kind of archs or tables for antenna rotation, ... . I would be very thankful for any kind of shared experience when it comes to building this kind of setups for precise measurements for research purposes.(I know that there are companies that sell these kind of setups as a whole, but their prices are so high that it seems to be the more rational choice to build it yourself)
Brymen BM786 EEVBLOG version with 2mA of consumption (Battery Draining) - Page 1
Forum section: electronics / testgear

author: davidt151
author_rank: Newbie
timestamp: November 01, 2023, 12:37:20 am
content: Is it Normal?I bought this multimeter a year ago and I have found that it eats batteries like candy, looked the video "EEVblog 1533 - How To Estimate Product Battery Life" and hooked other multimeter to measure current consumption and found 2.68 mA when shut down| Supply Voltage (V) | Current (mA) | Equivalent Impedance (Kohm)0.61 0.47 1.271.51 1.13 1.334.11 2.68 1.53Tried measuring resistance across the battery terminals and found the same 1.8 Kohms in forward and backward measuring.When saw "EEVblog 1449 - What Causes Excess Battery Drain? (BM235)" I started looking for components and my main suspect at the moment is the 100uF tantalum capacitor as I could no measure any capacitance in the terminals (measured in PCB), at the moment I am waiting for a hot tweezers before starting to make an intervention.I think is a faulty capacitor and not the diode as it is a very consistent resistance, but I would like to know your opinion as I do not have a lot of experience with these things.

author: Fungus
author_rank: Super Contributor
timestamp: November 01, 2023, 01:14:41 am
content: I think Dave's video is correct. The money has to be on the capacitors that are across the batteries.OTOH I those capacitors shouldn't be tantalum. Are you looking at the right ones?

author: davidt151
author_rank: Newbie
timestamp: November 01, 2023, 02:55:04 am
content: At the moment I have identified 3 elements that are in parallel with the batteries, a ceramic that measured 7uF, a tantalum that I could not measure and the diode that seems just fine, all elements are in the upper part of the image.The images are taken from the EEVblog.

author: Fungus
author_rank: Super Contributor
timestamp: November 01, 2023, 10:18:49 am
content: Take that tantalum out, see what happens...
Rigol DHO800/900 Topic Collection - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: October 31, 2023, 06:12:52 pm
content: Hi,Listing of the previous topics, I will keep this thread in my signature, then you can find them again quickly....If new interesting ones have emerged or I have forgotten some, feel free to post them here.DHO800 Unbox&TeardownDHO804 Test&Compare ThreadHacking the Rigol DHO800/900 ScopeDHO800/900 Bug Reports + FirmwareDHO800/900 Presales beginDHO900S BodeplotDHO800/900 Wishlist/Suggestion ThreadMartin

author: Grandchuck
author_rank: Super Contributor
timestamp: October 31, 2023, 07:20:24 pm
content: https://www.eevblog.com/forum/testgear/new-dho804-does-this-compensation-signal-look-noisy/
PM1200 power analyzer update rate - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: October 31, 2023, 02:38:08 pm
content: Hi,Using PM1200 to read voltage...it only updates every 10 secs or so, how to get it to update in about 0.5 second or less.?Manual doesnt say...https://www.testwall.com/product/voltech-pm1200/
cheapo aliexpress 2 channel dso issues - Page 1
Forum section: electronics / testgear

author: p.larner
author_rank: Frequent Contributor
timestamp: October 30, 2023, 11:04:06 pm
content: i have just had this deliveredhttps://www.aliexpress.com/item/1005005998007282.html?spm=a2g0o.order_list.0.0.21ef1802bYYgEk&gps-id=pcOrderListRecommend&sci see no menus or a way to set volts/div or timebase etc,any ideas?.

author: Fungus
author_rank: Super Contributor
timestamp: October 30, 2023, 11:20:57 pm
content: Quote from: p.larner on October 30, 2023, 11:04:06 pmIf pressing the "Menu" button doesn't do it then it's probably broken.

author: p.larner
author_rank: Frequent Contributor
timestamp: October 31, 2023, 12:04:04 am
content: the menue button brings up a screen but no way to adjust things like vdiv coupling trigger and timebase so unusable as is.

author: Psi
author_rank: Super Contributor
timestamp: October 31, 2023, 12:13:54 am
content: Might be worth having a look at the PCB soldering, crappy soldering is a common issue on cheap china stuff. The design works but they don't do QA/QC so stuff with obvious broken solder joints gets send out.The buttons maybe soldered by hand, so that's a common fault when hand assembling them for cheap.

author: KungFuJosh
author_rank: Super Contributor
timestamp: October 31, 2023, 12:16:47 am
content: I have a Fnirsi TC3 and the scope took a second for the same type of stuff.My guess is to move the Left and Right buttons, and you should see some form of indicator that one of the listed settings on the screen are selected. Once you figure that part out, then you probably just hit the +/- keys.

author: p.larner
author_rank: Frequent Contributor
timestamp: October 31, 2023, 04:05:12 am
content: sorted it was a bad button,now the button is working to move the selection it seems ok,its for a pocket sized iv curve tracer/octopuss im putting together.the button seems to be getting better the more its used,oxide layer wearing off i guess.

author: Aldo22
author_rank: Super Contributor
timestamp: October 31, 2023, 09:23:11 am
content: By the way. This device already has athread.Difficult to find because the name is not entirely clear.Probably SCO_2_10M

author: tunk
author_rank: Super Contributor
timestamp: October 31, 2023, 01:04:16 pm
content: When you get more familiar with it, maybe you could post some of your impressions?
BK 1570A Recovery - Page 1
Forum section: electronics / testgear

author: watchmaker
author_rank: Unknown
timestamp: October 31, 2023, 12:50:13 am
content: So I bought a BK 1570A for $90. When it arrived, the Post Office had crashed the box onto the floor from a serious height. Landed right on the knobs. Worked kind of sort of, but really of little use. Inside and outside the box showed where the knobs hit. I mean both panels were pushed in about 6 mm. The Horizontal knobs were really pushed in, the Plexi glass scale cover was cracked, all pots were at a sick angle. Forget about getting a manual trigger.Too bad. This was a unit from State University of NY, Fredonia. S/N 331 even. So I bought another one from that seller and started a return. He told me to keep it.Was not worth the time, but what the Hell. No guts no glory.Spent about 6 hours taking it apart and straightening out the frame behind the cover panels. Just getting the knobs off was interesting, forget about moving all the boards out of the way.Cleaned everything with contact cleaner while I was there, checked for loose connectors and such. Found two broken grounds in the vertical section.Put it back together and fired it up. This is one serious piece of kit. I just used BK's user manual to make a precise time measurement to calculate a frequency. Within one Hz!But the real story is BK! Other than the broken ground straps, everything is happy as a pig in mud. I attached a couple photos I sent the seller. Who today makes things this survivable?I did find the Service Manual for a rebadged 1570A and BK sent me the user manual and schematic, gratis! If there is someplace I should upload them please let me know.This will help me understand the Siglent better. But now I have to figure out what to do with two 1570A scopes. If the second one comes in and looks like the first one before the PO dropped it, I may adjust both and then keep the better one.BTW, anyone know of a "kid" who would like a 2003 Agilent with floppy for the cost of shipping? Two channels.Now I have to go back to learning matrix algebra to solve ckt equations. Damn!Regards,Dewey
TDS3000 Series Error Codes - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: November 01, 2023, 01:41:07 pm
content: TDS3000 Series Error Codes do not appear to be the op or service manual. I have one TDS3052 that every so often after being off for a while, produces an error code 14 when booting up. It is fine after that and the error doesn't seem to reproduce.I am leaning towards a floppy drive error, maybe RTC Error (I have one scope, not sure which one, without the RTC Chip upgrade). Diags do not repeat error. I only see the error on a power-up and there are many instances of ERROR 14 in the error log. This does not seem to affect the operation of the scope.Dave
Easy low noise reference options? - Page 1
Forum section: electronics / testgear

author: tom66
author_rank: Super Contributor
timestamp: October 30, 2023, 03:29:45 pm
content: We have a system with a 14-bit ADC where we need to assess the noise of the system, to determine if a noise problem is caused by the sensor or our amplifier electronics.The input signal is typically around 1-2V DC. So we would need a reference with a noise of around 10uVrms (as our quantisation noise is 120uV at 1LSB) to see how much noise is being contributed by this.I thought some inexpensive 1.25V multimeter reference e.g. for a 6 1/2 digit multimeter, for the voltnuts on here, would be good. Any suggestions?This is a work project so cost is not too critical but timescale is reasonably, so we ideally want to just buy something pre-calibrated and tested that we can hook up, put in a nice shielded environment and make the measurement.

author: tszaboo
author_rank: Super Contributor
timestamp: October 30, 2023, 04:11:54 pm
content: I personally would get a REF5020 because I used that on several designs. There are better/newer chips though. I'm sure Linear technology will have something better if you really want.Power it from a 9V battery and place it in a metal box.

author: tom66
author_rank: Super Contributor
timestamp: October 30, 2023, 06:35:41 pm
content: Are you aware of any REF5020s that come on a development/test board? I couldn't find any. Ideally we'd not spin a PCB like this, too much engineering time spent. Happy to spend, say $/£/€50-100 on a reference board and be done with it.

author: Alex Nikitin
author_rank: Super Contributor
timestamp: October 30, 2023, 07:42:31 pm
content: Quote from: tom66 on October 30, 2023, 06:35:41 pmAD has a number of development boards for low noise references, for examplethis one for 1.2V.Orthis one for 2.5V.CheersAlex
Weller WD1 solder station with WP80 pencil not working - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: October 30, 2023, 03:56:38 pm
content: Hi,[EDIT..OK its back working again...just had to press both up and down buttons together.]I just upped the temperature on the weller iron, and it then reports "OFF"....and has gone cold. Do you know what has happened?...is it "take it apart time"?I have been using this iron without problem for the last 4 months.Any known fixes for these?

author: Performa01
author_rank: Super Contributor
timestamp: October 30, 2023, 05:25:50 pm
content: Weller users should be aware that their stations don't provide a separate channel on/off switch, but pressing both the up and down buttons at the same time serves this purpose.
Rigol HDO/DHO 4000 battery pack - Page 1
Forum section: electronics / testgear

author: airone14
author_rank: Newbie
timestamp: October 27, 2023, 12:19:14 pm
content: Good morning EEVBlog members/siteAnd thank you for accepting account registration..I have a question to propose, although I already imagine it will be a "hard-to-find" positive answer or solution...I've just purchased Rigol DHO 4000 series, the choice fell on the cost-performance ratio but also on the "advertised" battery operation... unfortunately only after the purchase did I realize that BPACK is apparently mentioned at a global level, but in fact it is a true ghost/unfindable...And despite various sent&reminder emails sent to various Rigol addresses in the world offices as well as Rigol HQ, they persist (and I declare Rigol's policy of bad manners/terrible customer support) in not wanting to give the slightest hint of an acknowledgment on the email, nor even a shred of e-mail response such as availability of supply or technical reasons for non-production / unavailability..inexplicable...let alone if they indicated the technical layout of the battery or better yet the battery connector on the back of the oscilloscope.Does anyone perhaps have more information for this unobtainable - non-production battery trade? Cost problems or perhaps also technical problems? I would no more bought Rigol, in fact fortunately it is the only instrument with this brand available to me, and also the last one coming about reading some posts on other devices which sometimes mention firmware difficulties..I partially watched a video on the 4000 series open teardown, but it is not clear connections and functions backplane battery PCB..Thank you.Davide

author: ebastler
author_rank: Super Contributor
timestamp: October 27, 2023, 12:42:39 pm
content: Have you asked the dealer you bought the scope from? Bytterfly, for example, have the DHO4000-BPACK listed on their website, although with an "ask for a quote" button instead of an online price.

author: airone14
author_rank: Newbie
timestamp: October 27, 2023, 02:31:16 pm
content: Hi Ebastler. Thank you for contact. I know Batterfly, as purchase in the last years for other instruments... same "Rigol way".. already 2 form page contact... nothing never nada zero 0 reply..!!

author: airone14
author_rank: Newbie
timestamp: October 27, 2023, 02:39:21 pm
content: Dealer oscilloscope (..rigol europe.. ) after my pressing reminder(s) about purchase/shipping infos, little reply "no available info from production departments", so...

author: Fungus
author_rank: Super Contributor
timestamp: October 27, 2023, 07:58:31 pm
content: Batterfly have always answered my emails within an hour or so.(during work hours)info@batterfly.com

author: airone14
author_rank: Newbie
timestamp: October 29, 2023, 03:17:50 pm
content: Hi Fungus. Thanks for contact. I know..Batterfly ever reply to mails or contact and/or recall for previous requests, but not fof these ones.. unfortunately 2 form compiled between some days.. never reply..so thinking about difficulties and embarraced about this one product from rigol warehouse, no reply to customer and I don't call ..
ignore - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: October 27, 2023, 07:45:26 pm
content: ignore

author: Serg65536
author_rank: Regular Contributor
timestamp: October 27, 2023, 07:52:08 pm
content: Symmetric ripple waves before the transient could be caused by linear phase filter only. Probably that's the anti-aliasing filter.

author: Serg65536
author_rank: Regular Contributor
timestamp: October 27, 2023, 08:08:28 pm
content: Sorry, I've forgotten about the sinc interpolation. That's definitely it! It's not enough samples to show linear the phase filter effect.

author: Smokey
author_rank: Super Contributor
timestamp: October 27, 2023, 08:47:39 pm
content: Quote from: Fungus on October 27, 2023, 07:45:26 pmIgnored.https://www.eevblog.com/forum/news/test-ignore/?all

author: Fungus
author_rank: Super Contributor
timestamp: October 28, 2023, 03:53:23 am
content: Thanks for ignoring this.
Rigol MSO5074 (and others?) Default Settings - Page 1
Forum section: electronics / testgear

author: SeoulBigChris
author_rank: Regular Contributor
timestamp: October 21, 2023, 11:40:55 pm
content: Last year I upgraded from my trusty DS1054Z to the MSO5074 because of some projects I had at the time. I am very pleased with my choice and it's been a great fit for the kinds of designs I work with. Some things I really like: It has a knob-per-channel for changing the vertical amplifier gain and offset, and also a separate knob for adjusting the time base and trigger offset. I've used digital scopes over the years that tried to combine many/all these into shared knob(s), and I found that arrangement less than satisfactory. I'm liking the larger screen (I'm getting old) and the touch screen. I'm impressed with the connectivity and use Ethernet quite a bit. Minor nitpick, what's with the Rigol color scheme? Two colors of blue? And pink? Is the yellow-blue-red-green color scheme commonly found on other scopes a patent or trademark thing? Anyway, on with my question...Because I'm lazy, I got to wondering about the scope default settings. If I'm working on one project for days or weeks at a time, I save the settings to a file. But every time I turn on the scope, I have to load the settings. It sure would be nice to specify a particular settings file to be default on power-up. It isn't immediately obvious how one would do that. Is this possible?A related question, is there a way to "mute" the display screen? I wouldn't mind just leaving it on 24/7, thus bypassing the above question entirely, but the display generates a bit of heat if left on all day. I'd say quite more heat than the DS1054Z does, unsurprising given the larger size and color of the screen.-Chris

author: Fungus
author_rank: Super Contributor
timestamp: October 22, 2023, 12:16:57 am
content: It should power on in the exact same state as you powered it off.If it doesn't then look in Utility->System for the "Power on" option and set it to "Last"

author: SeoulBigChris
author_rank: Regular Contributor
timestamp: October 27, 2023, 12:06:09 am
content: Thanks, @Fungus. That did the trick. I’m surprised that isn’t the default setting from the factory.

author: jeffjmr
author_rank: Regular Contributor
timestamp: October 27, 2023, 02:10:00 am
content: There’s also a screen saver setting that I use with a single character that might work for you if you want to oeVe it on, Page 16-4 in the manual.Jeff

author: SeoulBigChris
author_rank: Regular Contributor
timestamp: October 27, 2023, 08:27:01 pm
content: Oh. That’s good to know. I really should RTFM. I see the screen saver function has been moved in the manual from chapter 16 to page 20-16, for anyone who finds this thread in the future.
NI (Ni-9260) alternative for other OS - Page 1
Forum section: electronics / testgear

author: HenrikWo
author_rank: Newbie
timestamp: October 23, 2023, 12:06:16 pm
content: Hi,I am looking for a voltage output module with which I can stream (close to realtime) a voltage signal from e.g. Matlab or similar.The output requirements are as follows:- Frequency range: DC up to min. 50 kHz (preferably 100 - 200 kHz)- Output voltage: anything between +/- 3 V and +/- 10 V- DAC resolution: 24 bits1. for frequencies above 10 Hz I currently use RME sound cards. This is relatively inexpensive but unfortunately DC is not possible with them!2. for DC I am currently dependent on NI, specifically the Ni-9260 module, but unfortunately the card only manages 51.2 kS/s.Does anyone know an output module that combines "both worlds" and is open for different operating systems (Windows, Linux, macOS)? I would like to get away from NI hardware for various reasons (which should not be a topic here!). For suggestions and ideas I would be super grateful!

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: October 23, 2023, 08:41:43 pm
content: There are many DAC audio devices that have DC-coupled output, Topping or SMSL brands for example. They typically have a small constant DC offset of around 1 mV, but otherwise work well at low frequency. I don't know if there are 24-bit analog output devices that work at frequencies above audio range.

author: RiZsho
author_rank: Contributor
timestamp: October 24, 2023, 08:19:33 am
content: Maybewww.dewesoft.com? They have some ADCs in the 100k-200k (even 1M), but DACs I don't know.

author: HenrikWo
author_rank: Newbie
timestamp: October 24, 2023, 08:53:45 am
content: Thanks for the hint with the DC-coupled outputs. I really did not have that on the screen! My "RME ADI-2 Pro FS R" should come back tomorrow from a measurement. I looked more closely into the data sheet and it should also be able to do that... I will extensively test this in the coming days and report here.

author: HenrikWo
author_rank: Newbie
timestamp: October 27, 2023, 12:55:00 pm
content: Hi, I found the time to take a closer look at the output of the "RME ADI-2 PRO FS R".Measuring device: Keysight 34465ADC: Measurement time 600 s; DC aperture 100 ms; 2000 Samples< 3 Hz: Measurement time 60 s; DC aperture 50 us; Sample time 1 ms; 50k Samples> 3 Hz: Measurement time 25 s; AC bandwidth 3 Hz; 100 SamplesThe results are attached! Have fun with it if anyone is interested!!!
Stupid SDS1104X-E Ques - Default Trigger Delay to Left Screen Edge ? - Page 1
Forum section: electronics / testgear

author: TomKatt
author_rank: Frequent Contributor
timestamp: October 27, 2023, 02:36:10 pm
content: I'm an older dog learning new tricks and have more analog CRO time under my belt than modern digital gear...While I appreciate the capabilities of modern scopes like my Siglent SDS1104X-E, I sometimes find it a bit frustrating that the trigger position defaults to center screen. I'm more used to triggering defaulting to the beginning of the sweep on the left edge of the screen, so the waveform has the entire width of the display. I know I can add some trigger delay time to 'reposition' the trigger horizontally, but if I change the timebase etc that goes out the window.Is there a way to default the trigger position so it remains at the beginning of the sweep on the left edge?TIA

author: tautech
author_rank: Super Contributor
timestamp: October 27, 2023, 02:49:48 pm
content: Quote from: TomKatt on October 27, 2023, 02:36:10 pmYep.Utility>P4> Reference Pos> Horizontal Fixed Position.Enjoy.

author: TomKatt
author_rank: Frequent Contributor
timestamp: October 27, 2023, 02:54:57 pm
content: Thanks!That's -exactly- what I needed. I even took time to RTFM and still missed that option.

author: tautech
author_rank: Super Contributor
timestamp: October 27, 2023, 03:10:37 pm
content: Quote from: TomKatt on October 27, 2023, 02:54:57 pmBut....if you Default the scope you will need to reset it.I like it set 2 div from left to see pretrigger info.Still there is a further option to make Fixed H Pos a Default setting.Start with Default to factory.Adjust to preferred settings foreverything.....takes a minute or 2.Save/Recall> Save> Type> To Default Key> Current Setup or Factory Setup (Default)You can do similar in Save> Setup, 10 types can be saved and Recalled from internal memory and an unlimited # to external memory.They just take a little more effort to recall than pressing a previously set upuserDefault.

author: TomKatt
author_rank: Frequent Contributor
timestamp: October 27, 2023, 03:21:46 pm
content: Thanks for the tips.I have used the Save to Default option - really very handy to be able to have the scope power up the way you like it. I'm glad that this Fixed Horizontal Position option is included in that (and I agree having 1 or 2 divs for pretrigger is handy).I had forgotten about the 10 setup save slots - I do have around 3 common setups and that will sure save some time and also error because I do like to use 1X probes and having setups for 1X & 10X is convenient.

author: tautech
author_rank: Super Contributor
timestamp: October 27, 2023, 03:45:06 pm
content: Quote from: TomKatt on October 27, 2023, 03:21:46 pmEvery user setting can be assigned to user Default.IP and some special settings are unaffected but all can be removed in Recall> Secure Erase <= everything is gone !Returned to factory settings.
Fluke187 LCD turns Off when measuring AC VOLTAGE - Page 1
Forum section: electronics / testgear

author: Ayoublee
author_rank: Newbie
timestamp: October 27, 2023, 12:42:08 am
content: Hello everyone,I was repairing a TV and measuring voltages in AC+DC mode as usul, suddenly the lcd turns off then turned back on once I removed the probes. I figured out it happens only for AC voltage measurements (either in ac mode or ac+dc one).When selecting mAC the lcd reading is full barre reading, but once measuring in AC or AC+DC an AC voltage the digits disappear as far as the probes are on the test points. DC voltage is measured without problem and doesn’t cause the lcd to turn off at AC mode.I changed the batteries and made factory reset, nothing changed.I opened the multimeter nothing suspicious, I saw an bridge rectifier Df068 and I doubt if it’s the cause of the problem. I don’t have any other multimeter to measure the components.The readings are normal when the probes are shorted or open. Again the problem appears only when measuring ac voltage (case 220V ac)Thank you.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 27, 2023, 08:06:06 am
content: Ac voltage(s) in what ranges ? not higher than 220vac as you wrote ??Smps supply sections ?Flyback section ?SpikesMotor(s) ??

author: Ayoublee
author_rank: Newbie
timestamp: October 27, 2023, 08:28:45 am
content: Hi coromonadali,Thank you for the reply. I talked to a colleague of mine and he suggested a miraculous solution: clean the area under the knob. Believe me it worked !!!!No idea why but it could help the community so I posted hier.Regards,Thank you
How do I get the resitance of the DCA ranges? - Page 1
Forum section: electronics / testgear

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 26, 2023, 03:15:49 am
content: Hello,Often higher end meters specify the burden voltage of the amps range. For example, 100mV/mA would give us a 100ohm resistor. But some meters only list the voltage drop as a < X.XXX number. Like the attached image.How do I get/approximate the resistance of the meter's amperage ranges?Thanks!

author: bdunham7
author_rank: Super Contributor
timestamp: October 26, 2023, 03:49:11 am
content: Ohms law, R=V/I. So the 10A range states "<0.5V", 0.5/10 = 0.05, that implies the resistance is 0.05 ohms or less. The total resistance includes more than the shunt--there's the internal circuitry and the fuse. That range likely has a 0.01R shunt.

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 26, 2023, 04:25:04 am
content: I figured ohms law was the way to go, but 11mV burden on 1nA seemed a bit high.

author: bdunham7
author_rank: Super Contributor
timestamp: October 26, 2023, 04:31:23 am
content: Quote from: ballsystemlord on October 26, 2023, 04:25:04 amThe burden voltage shown is the maximum at full range. At partial range readings, it should be proportionately less if it is using a regular shunt system. If it is an active system, then the input can't be characterized as a resistance. This meter likely uses a 100R shunt for the low current ranges and a gain amplifier for the very lowest.
Vintage test equipment ID - Page 1
Forum section: electronics / testgear

author: polishsausage
author_rank: Newbie
timestamp: October 30, 2023, 04:09:26 pm
content: Hello,first of all, apologies if this post doesn't fit this subforum properly, so please either move it or delete it.In a recently uploaded video about an R-32 computer that was built in Poland in the mid-1970s (that can be watched here:), a pretty uncommon test gear appears: an unknown 6-digit nixie multimeter and an SS-6100 "Synchroscope".As for the "Synchroscope" name, it was pretty easy to find on the Internet: that's an Iwatsu's series of oscilloscopes, however this specific model seems to be also not widely known.I'm rather more interested in the multimeter shown, and it would be lovely if anyone could recognize what this multimeter brand was - from what I can see, it's labelled as "Precision Digital Meter Type 7501" (or 2501 or 2581?). One of my friends suggested that it could be some Yokogawa equipment, as a Model 2501A did exist, but it's very difficult to find any information either way. It's also possible that it was some super-rare locally-made (or Russian/GDR-made) stuff, but to my eye, it looks too well-built in terms of quality.Screenshots attached.Thank you for any answers. Kind regards

author: TimFox
author_rank: Super Contributor
timestamp: October 30, 2023, 05:01:35 pm
content: I'm not familiar with Eastern European equipment.However, the term "synchroscope" was used by the US "Radiation Laboratory" in their classic summary of WW II radar development to mean a triggered-sweep oscilloscope (as in all of the later Tektronix analog CROs), as opposed to a cheaper CRO that used a free-running oscillator driven from the sync input signal, referred to as "synchronized sweep", which is long obsolete.See chapter 18 ofElectronic Instruments, vol 21 of the "Radiation Laboratory Series", McGraw-Hill 1948.https://www.scribd.com/document/37136090/MIT-Radiaton-Lab-Series-V21-Electronic-Instrumentation(link mistakenly says "Instrumentation" for "Instruments".)

author: BILLPOD
author_rank: Frequent Contributor
timestamp: October 30, 2023, 05:26:32 pm
content: Good Morning Polishsausage, (is your nickname Kielbasa?)welcome to the forum. My parents came to the USA in the 1930s and Polish was spoken in my home as I grew up, but I've been away from the language for many years. I enjoyed the video and I even understood some of the narration, so thank you for that.I don't recognize any of the equipments, but the "Synchroscope" looks similar to some of the Hewlett Packard instruments of the past
TTI PSU value - Page 1
Forum section: electronics / testgear

author: Ariamella
author_rank: Contributor
timestamp: October 12, 2023, 08:58:49 am
content: What's a TTI CPX200 or PL330QMD worth used nowadays in £? I see a couple units on ebay and I'm thinking of picking them up but don't want to cop without seeing if they're actually worth it first. If not, I might just design my own power supply...

author: Ariamella
author_rank: Contributor
timestamp: October 26, 2023, 01:20:59 pm
content: Bump

author: Dave92F1
author_rank: Contributor
timestamp: October 26, 2023, 05:33:58 pm
content: I love those things. I've bought 4 of them over the last several years (one had a channel die and I sold it).Prices vary a lot based on condition, but the range is like $100 to $200 (USD). Plus shipping.I got the first one about 5 years ago really cheap - $45 + shipping I think. It looked horrible tho. Worked fine.
[Sloved] Percent of range, how is it calculated? - Page 1
Forum section: electronics / testgear

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 26, 2023, 02:33:22 am
content: Hello,I was reading some specs for DMMs and instead of the typical xx% + xxDigits, I came upon xx% + xx% of range.So if the range is 1000.00V, and I'm measuring 1V, and the accuracy is 0.1% + 0.01% of the range, then I could get a reading of up to 101.001V?!(1V*1.001%)+(1000(range)*0.01%) == 11.001VAnd that's assuming I'm using only the portion of the range after the period. If not, then 1V could become:(1*1.001)+(100000*0.01) == 1,001.001V!!!Now I suspect I'm making a mistake somewhere, please point me in the right direction.Thanks!

author: Fungus
author_rank: Super Contributor
timestamp: October 26, 2023, 02:40:09 am
content: I assume you mean when measuring AC voltage.Many TRMS convertersareinaccurate at the low end of their ranges.That's why we have auto-ranging meters - to switch to a lower range on demand and avoid these problems.

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 26, 2023, 03:06:33 am
content: No, not AC. This is the DC range.

author: mwb1100
author_rank: Frequent Contributor
timestamp: October 26, 2023, 03:10:16 am
content: You’ve got a decimal point in the wrong place.0.01% of the range would be:(1000V * 0.0001) = 0.1

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 26, 2023, 03:24:38 am
content: Which if we took the above datasheet picture and applied that for 1V at the 1V range, we'd get ((1*1.01)+(1*0.00005)) = 1.01005. Or the reading could be off by as much as 1% even though the meter's accuracy is 0.01% in the 1V range... Which means that absolute accuracy specs are a bit misleading?

author: J-R
author_rank: Super Contributor
timestamp: October 26, 2023, 04:02:07 am
content: (1V*0.0001)+(1V*0.00005)=0.00015VSo in spec is between 0.99985V and ‭1.00015‬V

author: bdunham7
author_rank: Super Contributor
timestamp: October 26, 2023, 04:02:51 am
content: I don't know how you are doing that math? 0.01% means you multiply by 0.0001 to get the tolerance amount.So for 1V on the 1V range you have (1V x .0001 + 1V x .00005) = 0.00015 allowable error. So your 1V input would be guaranteed to read between .99985 to 1.00015.Now 1V on the 1000V range you have (1V x .0001 + 1000V x .00005) = .0501 allowable error. Your 1V input is now guaranteed by spec to read betwen .9499 and 1.0501, except that you only have a 5.5 digit meter so in the 1000V range, or the 1000.00V range with all the digits shown, your 1V can only read 000.95 to 001.05. Of course the leading zeroes may be suppressed.

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 26, 2023, 04:27:31 am
content: I Sorry about that, I keep forgetting that a 0.XX% means to multiply by 0.00XX to get the correct result.

author: AVGresponding
author_rank: Super Contributor
timestamp: October 26, 2023, 05:21:36 am
content: AC in particular will usually specify the accuracy is only valid for readings within 20-80% of range (or thereabouts) as well.
Fortune Semiconductor FS9721-LP1 Vs. FS9721-LP3 - Page 1
Forum section: electronics / testgear

author: shakalnokturn
author_rank: Super Contributor
timestamp: July 20, 2023, 12:11:32 am
content: I figured this was the most appropriate section for my question, sorry if it wasn't.I have an upcoming Hantek Scopemeter repair that will possibly involve replacing the DMM ASIC.What are the differences between -LP1 and -LP3 suffixes?Anyone had luck with the dirt cheap GC7721 equivalent such as this onehttps://www.aliexpress.com/item/1005002054301623.html?

author: shakalnokturn
author_rank: Super Contributor
timestamp: October 25, 2023, 09:11:17 pm
content: As a follow-up to my own question:The GC7721-P1 ordered did exhibit some signs of life but would not communicate with the rest of the meter as intended. I didn't go to in depth analysis of why it was not communicating. The GC7721-P3 worked like the original chip but required some readjustment.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 26, 2023, 03:57:26 am
content: for the 1st one you may have got a defectiveunless there is an huge difference between these two ?? maybe ask Fortune Semiconductor....
Rohde & Schwarz HMC8043 PSU Service manual / Schematic - Page 1
Forum section: electronics / testgear

author: Neuro
author_rank: Contributor
timestamp: October 01, 2023, 11:00:20 am
content: Hello and thank you for providing such a great forum!Lots of useful information throughout the whole site.I've got a brocken Rohde & Schwarz HMC8043 PSU, which I'm trying to repair.My search in Internet, trying to find a service manual gave nothing.So may be, someone knows, where can I get a schematic diagram of this PSU?TIA for any replies and have a great day!

author: RogerThat
author_rank: Regular Contributor
timestamp: October 23, 2023, 08:29:11 pm
content: I'm looking for one too. I've got a (half )broken HMC8042, only ch1 is working. ch2 is dead and I've traced it to a low on the enable pin on the lm5001. I can't trace where it's coming from since the signal disappears into a middle layer....

author: Wade2019
author_rank: Contributor
timestamp: October 28, 2023, 09:17:00 am
content: R&S and NO Service manual / SchematicHowever, HMC8043 has been repaired and is close to being scrapped.
UCE-CT220L Fault Locator & Curve Tracer opinions - Page 1
Forum section: electronics / testgear

author: RiRaRi
author_rank: Regular Contributor
timestamp: July 20, 2023, 06:44:53 pm
content: Have anyone seen this small and compact curve tracer which seems to be excellent choice for finding fault on pcb which is way more simple than using osciloscope and function generator. Any opinions on this are welcomed.

author: andre2142
author_rank: Newbie
timestamp: October 25, 2023, 06:57:37 pm
content: I would like to know this as well, that seems like pretty well developed device