hybridfree/eevblog-posts huggingface dataset:
HP 4155A service manual or schematics - Semiconductor Parameter Analyser - Page 1
Forum section: electronics / testgear

author: Swake
author_rank: Frequent Contributor
timestamp: September 08, 2023, 09:21:40 pm
content: Hi all,I'm looking for service manuals and schematics and likely also calibration instructions for a HP 4155A Semiconductor Parameter Analyser (this is sort of a digital curve tracer with 4 SMU's).Eventually service manuals for a 4156A; 4155C could help too; as I think they have common components.
Panel buttons/keyboard mapping is wrong in SDS1104X-E, general panel issues - Page 1
Forum section: electronics / testgear

author: silencer_ar
author_rank: Contributor
timestamp: August 09, 2023, 03:29:50 pm
content: Hello!About a month ago my sister in law, who had to travel to Seattle, brought me an SDS1104X-E which I bought through Amazon. I live in Argentina, and now the oscilloscope is here with me.I've been going through the manual and getting to know the UI, but noticed that there seems to be something really wrong with the buttons panel. Some buttons are not properly mapped. According to the keyboard self test:3rd soft key to the left -> MenuSave/Recall -> Channel 4Aquire -> Channel 2Display/Persist -> Channel 3Ref -> Channel 1Horizontal Zero (clicking the knob) -> Vertical Fine adjust (clicking the knob)There are some more I didn't put here.This happens as soon as I turn on the device. If I use it for a while, eventually part of the panel becomes unresponsive, for instance, vertical and horizontal knobs will stop responding at all. I've already tried updating the firmware.I've written a message to Siglent through their site, but I'm not holding my breath about them having service support in Argentina, so I'm wondering if you might have any ideas about what could be happening. Maybe there's something I can check myself?thank you!

author: tautech
author_rank: Super Contributor
timestamp: August 09, 2023, 10:56:16 pm
content: Welcome to the forum.I've sent a message to Siglent NA whom stock Amazon to contact you directly.You might also send me your email via PM so I can forward it to them.

author: silencer_ar
author_rank: Contributor
timestamp: August 09, 2023, 11:26:54 pm
content: Thank you Tautech! I've sent you a PM with my email and the order number.

author: tautech
author_rank: Super Contributor
timestamp: August 09, 2023, 11:46:10 pm
content: Quote from: silencer_ar on August 09, 2023, 11:26:54 pmAll sorted, Siglent NA now have your details so expect contact once they analyze your problem.

author: silencer_ar
author_rank: Contributor
timestamp: August 10, 2023, 02:45:58 am
content: Thank you so much tautechI'll be waiting for a message from them, then.

author: silencer_ar
author_rank: Contributor
timestamp: September 13, 2023, 04:33:44 pm
content: Quote from: silencer_ar on August 10, 2023, 02:45:58 amI got contacted by them, and apparently I should be able to get it fixed by warranty here.Thank you so much Tautech!
Atorch DLB-600W DC load - Page 1
Forum section: electronics / testgear

author: Odd
author_rank: Regular Contributor
timestamp: September 08, 2023, 10:51:52 am
content: Hi, I purchased a DLB-600W from Atorch on Aliexpress.The load can be connected using kelvin probes.I heard a loose part inside - it was a 1cm wide 6-turn coil on 0.9mm wire. it's resistance is 50mOhmAtorch support told me it was mounted internally between I- and V- inputs as a "reverse polarity protection"Having it there clearly destroys half of the precision gained by having sensing leads.1. Does anyone know exactly what it is supposed to protect? - I can only assume it is against connecting V- to V+ or so.2. if you have one, and do not remove it : do know that the precision is compromised. - the factory calibration of the device is otherwise very good.
Anyone else own a Z-TEST troubleshooter? - Page 1
Forum section: electronics / testgear

author: dorkshoei
author_rank: Frequent Contributor
timestamp: October 24, 2017, 04:05:24 am
content: Curious if anyone else owns one of these? Made by a Canadian company called Z-Test. It was released in the US under the Fluke brand but in Canada under the Z-Test brand in the early 1990s. Basically a more advanced version of the BK Precision 860 out-of-circuit/in-circuit tester.I have one of the Z-Test TM3000 versions. Supposedly there were later TM-3028 and TM-3064 versions but the only information I can find on these two later versions is a scanned service manual. Z-Test are nominally still in business, but doing something totally different. Their reply when asked for help was pretty much; we're glad to hear you're using this 20yo old stuff, now please go away ;-)Curious if anyone has more info on these later 3028/3064 models, or even owns one.IF ANYONE HAS ANY PARTS I'D LOVE TO HEAR FROM YOU (please private message me). I'm looking for the Interface Buffer (approx 8"x8"x1" sized box) that plugs into the side of the main unit. Until I can find one, the main unit (pictured below) is basically just a doorstop.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 08, 2023, 03:23:57 am
content: Bump. Still hoping to find others who have one of these or parts for them.If you have one of these units or have info on them I'd love to talk.Please click here to send me a PM.

author: Uup
author_rank: Regular Contributor
timestamp: September 08, 2023, 04:16:51 am
content: Looks like a Fluke 900, or the other way around. I have a working Fluke 900 at home. I can help with questions on the Fluke but it may or may not apply to the Z-Test

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 08, 2023, 04:36:43 am
content: Quote from: Uup on September 08, 2023, 04:16:51 amCorrect. Fluke resold the 3000 in the USA. If you read the manual for the Fluke 900 it's marked Z-Test as is the PCB inside the 900.I have a 900. I'm looking for original Z-Test parts to complete my Z-Test unit.

author: Uup
author_rank: Regular Contributor
timestamp: September 08, 2023, 07:17:15 am
content: I acquired all of the Fluke 900 gear from my work place back in the day. There were two units plus all the accessories, manuals, software disks, etc. I still have new memory cartridges sealed in the original Fluke packaging. Unfortunately I don't have any Z-Test stuff, at least from recollection.
Siglent SDS2000 series out of Siglent websites - Page 1
Forum section: electronics / testgear

author: ptluis
author_rank: Frequent Contributor
timestamp: September 08, 2023, 12:39:24 pm
content: Why there's no information, including firmware updates about the Siglent SDS2000 series oscilloscope on any Siglent websites? could this be a rejected model? or having serious problems?

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 08, 2023, 01:32:31 pm
content: That's not accurate. The SDS2000X is EoL, and replaced by the SDS2000XP. Firmware for both series can be found here:https://siglentna.com/service-and-support/firmware-software/digital-oscilloscopes/#sds2000xpScroll down to the sds2000x if you don't need the xp version.

author: rf-loop
author_rank: Super Contributor
timestamp: September 08, 2023, 03:35:03 pm
content: Quote from: KungFuJosh on September 08, 2023, 01:32:31 pmAnd even more.SDS2000 launched 2013 was before SDS2000XTimelineSDS2000 --- SDS2000X --- SDS2000XPlusLatest FW for SDS2000 hardware what I know was 2017/04/06 version 1.2.2.24Q2015 was first V2 FW version what rise memory length to 70M (yes only FW thing) Several other updates withsome improvements + bugfixes until final 1.2.2.2 .. and stopped.I have no revision history about V1 FW versions (Before version V2 there was seveal serious problems in all V1 version FirmWares

author: nctnico
author_rank: Super Contributor
timestamp: September 08, 2023, 05:11:39 pm
content: Quote from: ptluis on September 08, 2023, 12:39:24 pmSerious problems. The one I bought ended up in the garbage bin. Utterly useless POS.

author: adam4521
author_rank: Regular Contributor
timestamp: September 08, 2023, 05:14:33 pm
content: This might be it:https://siglentna.com/USA_website_2014/Firmware&Software/firmware/SDS2000firmwarev1222.rarOther versions and manuals etc are in the same folder tree. Maybe it should be archived if documents/firmware are being cleaned out of the website.

author: ptluis
author_rank: Frequent Contributor
timestamp: September 08, 2023, 05:31:18 pm
content: Quote from: KungFuJosh on September 08, 2023, 01:32:31 pmI was referring to the non X model

author: ptluis
author_rank: Frequent Contributor
timestamp: September 08, 2023, 05:32:39 pm
content: Quote from: adam4521 on September 08, 2023, 05:14:33 pmThank you for the link

author: ptluis
author_rank: Frequent Contributor
timestamp: September 08, 2023, 05:36:24 pm
content: Quote from: nctnico on September 08, 2023, 05:11:39 pmI'm planning on buying a cheap one below 200€ to make an experiment.

author: KungFuJosh
author_rank: Super Contributor
timestamp: September 08, 2023, 05:37:46 pm
content: Quote from: ptluis on September 08, 2023, 05:31:18 pmOh, my bad. That's all in this directory tree:https://siglentna.com/USA_website_2014/Firmware&Software/
Problem on Arbexpress - Page 1
Forum section: electronics / testgear

author: WasabiSC
author_rank: Newbie
timestamp: September 05, 2023, 03:00:42 pm
content: Good morning/afternoon to everyone,I'm a newbie to this forum so sorry if the question I'm gonna be asking will be bad, anyway I have this problem:I am currently using a Tektronics AFG31052 to generate 2 square wave signals (with changing phase and frequency). To do that I have done a small script in Matlab to generate to 'txt' files to plug in Arbexpress and convert them into 'tfwx' format, then by using a usb stick I get the desired signals and thats easy.What I had in mind was to use the LAN connection to output the signals without going thorugh the USB stick (and maybe not even Arbexpress), I have connected "successfully" my PC to the AFG: I am able to generate simple signals through the Instrument control, but I cant send any file to the AFG nor I can see the Instrument folders. To be more precise when I try to send via File transfer I have the error shown in attachment.So what Im asking is what Im doing wrong here?

author: WasabiSC
author_rank: Newbie
timestamp: September 07, 2023, 09:02:41 am
content: SOLVEDTo correct this problem just uninstal and reinstall the version of Arbexpress used or perform a downgrade.
Scope probe with 50R resistor on end - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: September 06, 2023, 07:18:16 pm
content: Hi,Does anyone have a scope probe with a 50R resistor on the end?..do you have a part number?......so that when in an offline smps, you are scoping the current sense input say, you dont suffer so much noise in the scope trace.

author: Kim Christensen
author_rank: Super Contributor
timestamp: September 06, 2023, 07:30:31 pm
content: Just get an inline / feedthrough BNC 50ohm termination if your scope doesn't have a 50ohm input option.

author: tggzzz
author_rank: Super Contributor
timestamp: September 06, 2023, 07:55:55 pm
content: Quote from: Faringdon on September 06, 2023, 07:18:16 pmAs usual you give far too little information - presumably in an attempt to provoke chatter.Since, apparently after a couple of decades, you still don't understand probes and safety, I suggest you read the references inhttps://entertaininghacks.wordpress.com/library-2/scope-probe-reference-material/

author: Caliaxy
author_rank: Frequent Contributor
timestamp: September 07, 2023, 12:26:02 am
content: I’m quite sure there is no such a thing as an oscilloscope probe with a 50-ohm resistor at the oscilloscope end. The 50 ohm termination is only used for transmission lines (coaxial cables with 50 ohm characteristic impedance, in most cases that involve oscilloscopes), to prevent/minimize reflections that create artifacts on the screen. There are quite a few old (but still amazingly enlightening) Tektronix YouTube videos that address the issue. “The art of electronics” has an excellent chapter (or appendix, IIRC) on transmission lines.Or maybe I don’t understand your question, case in which I apologize….

author: tggzzz
author_rank: Super Contributor
timestamp: September 07, 2023, 01:04:48 am
content: Quote from: Caliaxy on September 07, 2023, 12:26:02 amNo need to apologise.See the other threads treez/faringdon has started in the past couple of days - and years. They are all spur-of-the-moment questions that don't give sufficient information - and that's the charitable explanation.However, since his behaviour is repeated even though quite a few people repeatedly point out the issue, some people are stating less charitable explanations.

author: jonpaul
author_rank: Super Contributor
timestamp: September 07, 2023, 01:40:50 am
content: See Zo probeshttps://www.davmar.org/TE/TekConcepts/https://www.davmar.org/TE/TekConcepts/TekProbeCircuits.pdfhttps://w140.com/tekwiki/images/1/19/062-1120-00.pdf( read a book)j
Vintage Philips function generators: Questions - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: May 16, 2019, 02:25:36 am
content: So I'm looking for a cheap but nice function generator and came across some old Philips models (PM5131, PM5135, others?). Any opinions on these, are they OK and reasonably trustworthy after all these years?Need to hunt down very narrow high-Q resonances in loudspeakers, and a big vernier dial adjusted by hand seems like a workable solution. From a quick search the Philips models are more affordable than HP or Leader equivalents.All comments welcome, thanks.

author: tautech
author_rank: Super Contributor
timestamp: May 16, 2019, 03:11:35 am
content: I've got an old PM5131 somewhere and it was my first sig gen.Never had any issue with it other than a bit of noise on the pots which is par for the course in older stuff.The big dial was way off frequency at the upper end but other than that it worked fine.I'd put the manual up but it's 3 MB and AFAIK not hard to find online.

author: trobbins
author_rank: Frequent Contributor
timestamp: May 17, 2019, 03:10:53 am
content: A free software sine generator like in REW provides 0.5Hz resolution settings up to 200Hz, and 1Hz above that - I'd suggest a lot more repeatable and accurate than analog equipment you may acquire - and ready to go within minutes

author: vk6zgo
author_rank: Super Contributor
timestamp: May 17, 2019, 04:10:39 am
content: Quote from: trobbins on May 17, 2019, 03:10:53 amSolid state analog is ready to go within seconds!Even tube stuff would be up in a minute.

author: trobbins
author_rank: Frequent Contributor
timestamp: May 17, 2019, 05:19:09 am
content: Not if you don't have the equipment and need to find something on ebay - which is I think the situation.Of course that assumes the OP is using a PC with a soundcard

author: AudioFile
author_rank: Contributor
timestamp: August 24, 2023, 07:55:00 pm
content: I know it's been ages, but just in case.All the manuals available for PM5131 seem to have page 41 missing as it was copied with the page folded over. Any chance of a copy of that page? I need to calibrate my unit and the sequence of adjustments seems to be important. Many thanks!

author: tautech
author_rank: Super Contributor
timestamp: August 27, 2023, 10:35:00 am
content: Quote from: AudioFile on August 24, 2023, 07:55:00 pmAs attached.

author: AudioFile
author_rank: Contributor
timestamp: September 06, 2023, 09:02:48 pm
content: Thanks so much for your reply, tautech. Sadly, this copy also has the folded over page 41. The search continues...
Has anyone reverse engineered the LeCroy MS500 logic probes? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: September 05, 2023, 10:31:54 pm
content: I have a LeCroy WR-XiA (my bank account still smarts).Has anyone reverse engineered the MS250/MS500-36/MS500 logic probes that fit this range of 'scopes?CheersDavid
Help identifying Tektronix unit model. - Page 1
Forum section: electronics / testgear

author: deltawars
author_rank: Contributor
timestamp: September 05, 2023, 08:01:53 pm
content: I have this tektronix unit that I got from a bundle of old equiptment I bought, but I have no idea what it is and I cannot find any information online about it.Do you guys have any idea what it is, what it does and does it have a model number.I have attached a photo of it.The identifiable text on the unit says 067-0570-01 Calibration fixture, Pal Vectorscope Test unit.Thanks

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: September 05, 2023, 08:17:18 pm
content: Quote from: deltawars on September 05, 2023, 08:01:53 pmsic

author: tautech
author_rank: Super Contributor
timestamp: September 05, 2023, 08:19:19 pm
content: https://w140.com/tekwiki/wiki/

author: mansaxel
author_rank: Super Contributor
timestamp: September 05, 2023, 08:48:47 pm
content: It's pretty much what it says, but if you've never seen a vector/waveform monitor setup, you won't realise what it is.Slight diversion:For analog colour video, as in TV production, you need some special calibration equipment, to make sure your levels and colours and bandwidths and whatnot are OK. The most important part here is a special oscilloscope that is adapted to show the video waveform.You throw colour bars from the pattern generator (another special box) through the DUT and then you look at the signal on the vector/waveworm monitor, and twiddle the gain and EQ on your distribution amp until the proper levels (indicated on the graticule, I said this is very application specific) are met. Then your video will come out nice in the other end.Have a look here:https://w140.com/tekwiki/wiki/1731andhttps://w140.com/tekwiki/wiki/1721Gorgeous pic:So, what you've got is a calibrator for the calibrator. It will put out a signal that should end up right on the mark on the other special instrument.
SDS1104X-E  Tiny BUG - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: September 03, 2023, 06:28:36 pm
content: Just noticed a tiny bug in the Bode Plot display on the SDS1104X-E.Strictly cosmetic. Just looks a little weird and messy. Instead of 2MHz it's showing 2.000000MHz.

author: 807
author_rank: Frequent Contributor
timestamp: September 04, 2023, 10:36:49 pm
content: Is it a bug or a "feature"?Having 6 decimal places in the MHz range & 3 decimal places in the kHz range allows your start & stop frequencies to be input down to 1Hz resolution. Looks like it's always been done that way...https://siglentna.com/application-note/bode-plot-filter-oscilloscope-generator/

author: BillyO
author_rank: Super Contributor
timestamp: September 04, 2023, 10:47:10 pm
content: Well. if it's a "feature" it's one that requires a bit "salt" along with it. It's fine to be able to set limits to the Bode plot to 1Hz at the low frequency end, but a bit meaningless up in the MHz range. The resolution of the display is less than 1 part in 500, let alone 3.5 more orders of magnitude.To each their own I guess. For me it looks messy. If it said 2.0M I would be fine with it. I could always go over to the config menu to see if I had actually set it to 2,000,173 - for all the difference that would make in any results I'd see.

author: 807
author_rank: Frequent Contributor
timestamp: September 04, 2023, 11:19:30 pm
content: Oh, I agree. It does look cluttered, but it looks intentional rather than a bug.The ideal solution would be to display the frequency only to the number of decimal places you entered. So entering 2MHz would display as 2MHz. Entering 2.001MHz would display as 2.001MHz etc. without the following unnecessary zeroes.Perhaps an idea for the next update?
SPI decoder for HP 16700 LA? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: September 02, 2023, 10:54:32 am
content: Did anyone ever write one?PS I do have a Saleae clone but it is working at its limits ...Thanks, David

author: MarkL
author_rank: Unknown
timestamp: September 04, 2023, 09:51:54 pm
content: I have not seen an SPI decoder for the 167xx series. Please post if you find one.I always thought it would be a worthwhile investment to write a sigrok driver for the 167xx. The 167xx can gather the raw data and then pass it to sigrok for processing. That way, the sigrok SPI decoder and large library of higher layer decoders can be leveraged. And it could be used for more than just SPI, obviously.The 167xx supports an RPI (Remote Programming Interface) documented here:https://www.keysight.com/us/en/assets/9018-40955/user-manuals/9018-40955.pdfIt uses plain ASCII commands, and also supports binary transfer for captured data. You can telnet to it on port 6500 to play. Type "help all" for a list of commands in addition to what's in the manual.It doesn't seem like it would be too complicated to glue this interface to sigrok.
Budget Signal Generator for aligning AM and FM radio and what else do i need - Page 1
Forum section: electronics / testgear

author: RiRaRi
author_rank: Regular Contributor
timestamp: September 02, 2023, 03:32:37 pm
content: Hello. What is good but cheap option for signal generator for aligning FM and AM radio? As far as i can see tinySA which is spectrum analizer has signal generator option and it cost about 60 dollars. Also what else do i need for aligning radios, boombox etc?Sorry, i am newbie. Hope this is okay topic.

author: tautech
author_rank: Super Contributor
timestamp: September 02, 2023, 08:46:35 pm
content: For FM you might need 120 MHz.AtweakedSDG2042X will do that.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: September 02, 2023, 09:24:01 pm
content: Yes, the TinySA's got a dedicated signal generator for both its two SMA -sockets "low and high"."Low signal out" will do from 0 to 350Mhz and RF-output levels from -76dBm to -7dBm alongside AM & FM modulation with adj. modulation freq."High signal out" will do from 240Mhz to 960MHz and RF-output levels from -38 to +9dBm with some FM modulation with adj. modulation freq.TinySA is a potent little self-contained signal generator in its price segment.TinySA Ultra will also do these things but with a wider frequency span up to 5.4GHz and also got "sweep", though TinySA-Ultra output dBm-values vary from -17.9dBm to -123dBm.The available RF-power (dBm) can to a certain extent vary depending on the frequency.

author: RiRaRi
author_rank: Regular Contributor
timestamp: September 04, 2023, 02:56:45 pm
content: Thats good to hear. Is there any other good option beside tiny SA?
SDS1104X-E $375 at Jameco - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: September 03, 2023, 03:29:01 pm
content: Looks like only 3 left.https://www.jameco.com/z/SDS1104X-E-Siglent-Technologies-Super-Phosphor-Oscilloscope-100-MHz-4-Channel-Dual-1-GSa-s-ADC_2297799.html

author: CaptainVTOL
author_rank: Newbie
timestamp: September 03, 2023, 04:52:02 pm
content: Snagged one for my first scope. Considered splurging for the SDS2104X Plus, but this deal is good enough that I couldn't pass it up. Thanks!
UNI-T UT131D calibration - Page 1
Forum section: electronics / testgear

author: siealex
author_rank: Regular Contributor
timestamp: August 27, 2023, 11:00:40 am
content: Is it possible to calibrate a UNI-T UT131D? On all voltage ranges it displays approx. 0.5% high. It's still within spec (on some ranges at the very edge), but slightly annoys when a cheaper Mastech M832 gives more precise readings.PS, does this device have any hidden features?

author: siealex
author_rank: Regular Contributor
timestamp: September 02, 2023, 09:00:54 pm
content: Even more, it is systematically low (up to 1%!) on low resistance ranges, e. g. 990..991 Ω for a 1 kΩ 0.25% resistor that reads 999..1001 Ω on a new Aneng AOS02.
High input impedance amplifier - Page 1
Forum section: electronics / testgear

author: Qmavam
author_rank: Regular Contributor
timestamp: September 02, 2023, 03:57:28 pm
content: Hi all, Here is a high impedance amp used to reduce the load on a High Q LC circuit, specifically when working on Crystal Radio tank circuits. I have built it and it does a good job, although I have no great measurement equipment. It's been a while, but I did set up a high Q coil (over 1000, very reduced drive to measure that high) on my Boonton 260A, measure the Q, then add the amp, make a small capacitance change to get back to resonance, then found very little change of the Q. Been to long I don't recall the exact numbers, but the addition of the amp resulted in little change to the measurement. It is a bit of different approach in that it starts with a 17 to 1 capacitive divider, consisting of a DIY air cap and the FET input capacitance, then a 17X amplifier driving a 50Ω output pushpull amp. It will output 4Vpp into 50Ω, or 8Vpp unloaded, before getting distorted.I have had feedback that the Rin is not anything near what the designer suggests, but, my tests say it is very high. Quote from the write up. "In practice the input resistance will be lower then 5780 M.Ohm because of dielectric losses e.g. in the gate of the FET."Just curious how others see this approach, and how it could be improved.http://crystal-radio.eu/fetamp/enfetamp.htmMikek

author: TimFox
author_rank: Super Contributor
timestamp: September 02, 2023, 04:08:05 pm
content: The input impedance at the tip, from the (very small) coupling capacitor into 20 M\$\Omega\$ resistor and (larger) shunt capacitance, can be calculated using the series-parallel conversion algorithms for the RC circuits.The capacitance at the tip stays approximately the same and will slightly detune an external circuit.The trade-off, of course, is the reduction in voltage from the capacitive voltage divider.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 02, 2023, 07:23:26 pm
content: For even higher input impedance one could bootstrap the 10 M resistor chain (e.g. a small capacitor from the source to the point between the two 10 M resistors).
New DSO+DMM+SG, Mustool MDS9208, 12MHz/50MSps (august 2023) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: August 20, 2023, 09:55:26 pm
content: Does it never stop?Another handheld DSO+DMM+SG, Mustool MDS9208:- 12MHz, 50MSps- 50mV-20V/div- 200ns-10s/div- no BNC-connector- 6000 count DMM- DMM rotary switch- 2.4" screen- signal generatorFrom Banggood at $64:https://m.banggood.com/2023NEW-MUSTOOL-MDS9208-3In1-Oscilloscope-Multimeter-Signal-Generator-12MHz-50Msps-Portable-High-Storage-Capacity-Low-Power-Consumption-p-1995183.html

author: tautech
author_rank: Super Contributor
timestamp: August 20, 2023, 10:00:54 pm
content: Quote from: tunk on August 20, 2023, 09:55:26 pmApparently not.QuoteUseless for much scope work.

author: Aldo22
author_rank: Super Contributor
timestamp: August 21, 2023, 10:01:54 am
content: The purpose of this type of device is not entirely clear to me.It is neither a particularly accurate multimeter nor a "real" oscilloscope (it doesn't even have a BNC connector or anything like that).Mustek has many similar models with very similar specifications.I don't even think they're "bang for the buck".If you want such an all in one device, I would spend $30 more for aDso3d12which offersmuch morein every way (And unlike other brands,twooscilloscope probes are included btw).However, I prefer separate gear. In the entry level segment, a AN870 plus a DSO2512G, for example, is a good value, in my opinion.

author: tunk
author_rank: Super Contributor
timestamp: September 01, 2023, 05:56:04 pm
content: Looks like it's also sold as GVDA GD188:https://youtu.be/watch?v=eJGYTWS5Zuchttps://www.gvda-instrument.com/electronic-instruments/digital-multimeter/3-in-1-digital-oscilloscope-multimeter-signal.html
EMI test receiver HP 85422E sweeps wrong frequency (100MHz = 73MHz) - Page 1
Forum section: electronics / testgear

author: KlausKragelund
author_rank: Regular Contributor
timestamp: September 01, 2023, 04:45:31 pm
content: HiI recently bought a EMI test receiver HP 85422E at an auction.I have tested it, directing a single frequency into the RF input.The gain is spot on, at most 0.5dB off. But the frequency is wrong.If I enter 50MHz, I get 20MHz peak. If I then add 100MHz, it only increased the peak by 73MHz. It's consistent, every time I increase by 100MHz, only 73MHz is seen (generator has been checked on another spectrum analyzer)I guess it works by sweeping a local oscillator, and generating an IF frequency.What could be wrong?RegardsKlaus
Keysight u1282A DMM Remote Probe Connector - Page 1
Forum section: electronics / testgear

author: franciscoPT
author_rank: Contributor
timestamp: September 07, 2023, 08:13:12 pm
content: Hello, recently i got a very good deal on a keysight u1282A, the equi was gifted to a civil engineer and because he didnt have a use to it he sold it for a really low price, now im using it and im enjoy it a lot, i wanted to do something custom with the remote probe but im having troubles in finding the conector for it, is the connector custom made from keysight? does anyone know where to get something like that?
Craftsman 82289 Multimeter MiniScope  - Page 1
Forum section: electronics / testgear

author: jmm418
author_rank: Newbie
timestamp: August 29, 2023, 07:36:26 am
content: HiI just Bought a Craftsman 82289 scope meter for $50it seems to be off when testing capacitors for example a 2.2uf is reading 1.5 i have another cheap meter that reads 2.2 when testing the same cap.The AC & DC voltage reading is accurateso i was thinking maybe there is a way to adjust it with a pot that's insideI have done some research on it the meter seems to be made by extech and there is also a VOLTCRAFT version of it model GDM 704 & Extech 381265 they look the same as the craftsmansomeone had taken the volt craft one apart there are a lot of pots inside i wouldn't know which one to adjust without messing it up maybe someone else would know or maybe it's best just to leave well enough alonehttps://www-elektroda-pl.translate.goog/rtvforum/topic1678487.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp&_x_tr_hist=true

author: AVGresponding
author_rank: Super Contributor
timestamp: August 29, 2023, 04:43:15 pm
content: Are you using the same test leads with both meters? Some of the difference might be there, at least.

author: jmm418
author_rank: Newbie
timestamp: August 30, 2023, 03:49:02 am
content: Hiyes i tried the same leads in both meters but it did not make a difference.maybe that's just the way the meter is made. or maybe it drifted i think it's almost 20yrs oldif i had the same one to compare it to then i would know.

author: mwb1100
author_rank: Frequent Contributor
timestamp: August 30, 2023, 07:13:54 am
content: I just picked up a Craftsman 82289 miniscope as well (don't ask me why). You got a better deal than I did.According to the silkscreen the meter is a rebrand of the WENS33N. Amazingly it turns out there's a page dedicated to the WENS33N (in Japanese):-https://hirokun.jp/av/wens_33n.html- google translated:https://hirokun-jp.translate.goog/av/wens_33n.html?_x_tr_sl=ja&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wappThe person who wrote that info page also posted calibration instructions with schematics:-https://hirokun.jp/av/wens_33n_sch.pdfSo you might be in luck as far as getting the capacitance adjusted. Please post details on how it goes!

author: jmm418
author_rank: Newbie
timestamp: August 31, 2023, 12:21:11 am
content: Thanks for posting that. Now I just need to figure out how to get it apart.

author: jmm418
author_rank: Newbie
timestamp: September 01, 2023, 07:05:46 am
content: it was kind of a pain to get apart at firstthe 4 screws in the back where the copper shield is do not need to come outand the white dial i thought was missing metal contact and one fell out but it's double sided and the top pcb has a smaller contact area so i hope & think it's fine.all i really had to do to get it apart was pry with a plastic pry panel tool and it disconnects from the f1-4 buttons on the front cover.adjusting the pot made more of a difference on higher rating caps than lower ones for example 10uf reads about 8
Test leads for old analog VOM multimeters - Page 1
Forum section: electronics / testgear

author: ledtester
author_rank: Super Contributor
timestamp: August 30, 2023, 02:36:55 pm
content: I've got a number of old VOM multimeters I'd like to make usable again and they use the pin style leads like shown in the attached pic as opposed to banana plugs that modern meters use.Is there a source for these kinds of leads? Would also appreciate hearing about any DIY ideas.

author: Kean
author_rank: Unknown
timestamp: August 30, 2023, 03:34:08 pm
content: I believe those are 2mm pins, and if so they would be compatible with 2mm banana plugs or adapters like Pomona 72914-02I have a similar Micronta on the bench for repair (my first ever multimeter), so if I remember tomorrow I can check if any of my 2mm banana plugs fit.

author: bdunham7
author_rank: Super Contributor
timestamp: August 30, 2023, 03:40:04 pm
content: I think those are .080" pin plugs, Probemaster has lead available with those ends, p/n 8019S.https://probemaster.com/8000-series-test-leads-only/

author: David D
author_rank: Contributor
timestamp: August 30, 2023, 05:16:25 pm
content: I just purchased some from this guyeBay auction: #https://www.ebay.com/itm/232638459213Can't get much better quality. I'm very happy with them.

author: factory
author_rank: Super Contributor
timestamp: August 31, 2023, 04:37:21 pm
content: That link doesn't work, but this one should.https://www.ebay.com/itm/232638459213David
Tektronix 7612D programmable digitizer (remote scope) test teardown repair - Page 1
Forum section: electronics / testgear

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 30, 2023, 08:21:12 am
content: i have been working hard the last few weeks with this oneit is a very special remote controlled storage oscilloscopefrom 1981 it store curves using two CRT but the screen is a silicon detectorif you like to see more go herehttps://youtu.be/JgW5u8RZbvA?si=cbDqlZDYm00np1Oe

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 31, 2023, 04:03:45 pm
content: i released part 2 todayhttps://youtu.be/njZrVuw4YIk?si=-fAqkziO-ONOc0eIhere you get a nice detailed tour around the unit, it is full of cool design solutions
Ultra Low Noise Preamp, 40dB ,20Hz to 10Mhz  - Page 1
Forum section: electronics / testgear

author: DennisR
author_rank: Newbie
timestamp: August 31, 2023, 06:41:22 am
content: I'm looking for a pre-build AC coupled 40db amplifier with very low noise. I would need a range between 20Hz to 10MhzI'd like to measure noise in the range of 100-500µV, but my oscilloscope noise floor is around 2mV.The Picotest J2180A-20 looks promising, but in only has a 20dB gain.https://www.picotest.com/products_J2180A.html

author: David Hess
author_rank: Super Contributor
timestamp: September 01, 2023, 10:05:41 am
content: 100 to 500 microvolts RMS over 10 MHz is 32 to 158 nV/SqrtHz which is not particularly demanding, and *worse* than some old 200 MHz oscilloscopes.A Preamble DA1855 or LeCroy DA1855A does more than you need and might be suitable if you can find one. Differential operation raises input noise by 40%, but also adds common mode rejection which removes noise.https://w140.com/tekwiki/wiki/Preamble_DA1855

author: sonpul
author_rank: Regular Contributor
timestamp: September 01, 2023, 10:45:16 am
content: If you described your tasks in more detail, perhaps someone will share their methods, experience and equipment used.QuoteBut the J2180A costs as much as a few new oscilloscopes to suit you. Maybe it makes sense for you to buy one and there is no problem?
A strange "7106" chip - Page 1
Forum section: electronics / testgear

author: siealex
author_rank: Regular Contributor
timestamp: August 29, 2023, 10:57:46 pm
content: Recently I bought a couple of 7106 chips in the QFP44 case. Markings on them look like:"i" logoICL7106CM44L0907DWZDToday I mounted one of them into a burnt meter.This chip looks like a 7106, swims like a 7106, quacks like a 7106 (yes, it's perfectly compatible), so... it must be a 7106, right?BUT...1. Pin 33 is the "Low Battery" segment driver (in the datasheet for 7106: NC). It lights up at approx. 6 V. I accidentally measured the output signal on a wrong pin (33 instead of 32) and found out that pin 33 acts like a segment driver.2. Pin 5 is "HOLD"!!! Yep, hold, like on modern cheapo meters. Short it to the battery positive with a switch (my meter has this switch) and you get a hold. In the same datasheet: NC as well.3. Pins 1 and 2 emit square pulses at approx. 3 Hz (one pulse per ADC cycle), the duty cycle on pin 1 depends on the analog input value (0..50%), on pin 2 is constant (approx. 25%). In the datasheet: both NC. Are they some test outputs of the integrator circuitry?4. The power consumption is approx. 0.3 mA in voltage mode (according to the datasheet, 1.0..1.8 mA). This is typical for 7126/7136/7137 chips, not 7106.What chip is this?

author: magic
author_rank: Super Contributor
timestamp: August 30, 2023, 06:51:01 am
content: I recall some commie block company made a clone 7106 years ago, there are probably clone 7106 made in China today.Something has to go into all those $5 manual ranging DMMs...I think I have seen some Internsil variant with HOLD and BATTERY LOW, but I can't find it now. I thought it was ICL7126, but it's not.So dunno, maybe it isn't exactly based on any original part.

author: siealex
author_rank: Regular Contributor
timestamp: August 30, 2023, 10:40:09 pm
content: Its surprisingly similar to the AME7106 datasheet.https://html.alldatasheet.com/html-pdf/55556/AME/AME7106/250/5/AME7106.htmlPins 1 and 2 are integrator status outputs (1 is high during deintegration, 2 during integration, during the auto-zero phase both are low), 33 is Battery Low (output), 5 is HOLD (input).BUT: my chip has the Intersil logo on it ("i" with a long triangle below) and ICL marking.

author: magic
author_rank: Super Contributor
timestamp: August 31, 2023, 06:34:35 am
content: Good find.Regarding the logo, it's just a bit of paint, it means nothing.You can buy FT232 clones with FTDI logo.You can buy DS18B20 clones with Dallas logo.You can buy 74 series logic clones with NXP or TI logo.This is normal business practice in ChinaEither some manufacturers are doing it or you can custom order ICs without markings and then print anything on them.

author: iMo
author_rank: Super Contributor
timestamp: August 31, 2023, 07:39:53 am
content: The 7106 family has been copied by many.. Interesting is the info in the AME's DS - the Ordering info - the Temp range - chips max temperature from 70 to 77C step 1CA pity there is not a pin called "6.5digits"..
FLUKE MULTIMETER FUSES - Page 1
Forum section: electronics / testgear

author: Wazza
author_rank: Contributor
timestamp: August 31, 2023, 01:21:29 am
content: Hi all,For those of you in Oztralia who still have the older Fluke multimeters (8010, 8020, 8050 etc) in service, there is a local supplier in Victoria who stocks compatible fuses.The company is SWE-Check (www.swe-check.com.au) telephone 03-9521-6133.I've just ordered fuses for my 8010 and 8050 meters, just to have spares on hand.Luckily they had one compatible mains fuse, (Buss MDQ 1/32 3AG glass, 32mA, SLOW blow) left on the shelf, but they do have a fast blow version of the 31mA fuse, part # 3AG-FB.031 on hand. I've ordered some of those to try.The 2A fuse that fits in the front panel fuseholder of the 8010 and 8050 meters (Buss AGX2 2A 6 x 26mm, cylindrical glass) is part # 8AG002and the current measurement functions' last line of defence, the internal HRC cartridge fuse (Littlefuse BLS 3A 10 x 38mm 3A) is part # BBS003.Waz
HP 8753ES, E5070B, 8753D comparison, and PC program suggestion - Page 1
Forum section: electronics / testgear

author: KlausKragelund
author_rank: Regular Contributor
timestamp: August 30, 2023, 09:50:31 pm
content: HiA local firm in Denmark just went bust, and I was so lucky to buy reasonable cheap 3 VNAs, which all seem to work:HP 8753ES, E5070B, 8753DAlong with 85046A reflection kit.I don't know the history of the instruments, have tried to find a guide online. I want to keep the best one, and sell the other 2 on Ebay. They all seem to work, and my guess is that I should go for the E5070B which has windows OS and is probably the one that can last the longest. I could also keep 2 of them, so if one dies in the near future I have a backup.Anyway, I need to connect them to a PC, and for the 8753 I found this tool:https://github.com/VK2BEA/HP8753-CompanionLooks very nice.Any other tools out there?Recommendations on which to keep?RegardsKlaus

author: KlausKragelund
author_rank: Regular Contributor
timestamp: August 30, 2023, 10:05:52 pm
content: Oh, I also got a EMI test receiver HP 85422E, would like to find a control SW for that one too, although that might be hard due to being an old instrument

author: Kim Christensen
author_rank: Super Contributor
timestamp: August 30, 2023, 10:05:55 pm
content: The 8753D, when paired with the 85046A reflection kit, has similar functionality as the 8753ES. Though the 8753ES has better overall performance. (Speed and some extra functions)I'm not familiar with the E5070B, but it looks like a newer variant compared to the 8753.. If I was doing to dump one of them, it would be the 8753D & 85046A if the other two are functional and have the required options installed.I'm sure all 3 can be controlled by Labview or some other software via GPIB.

author: KlausKragelund
author_rank: Regular Contributor
timestamp: August 30, 2023, 10:25:36 pm
content: Quote from: Kim Christensen on August 30, 2023, 10:05:55 pmThanks. I found a comparison:for the E5070, it has 20dB better dynamic range, much faster sweep, and less noise.Comparison between analyzers that I found:https://www.manualslib.com/manual/1217903/Hp-Hp-8753e.html?page=50#manual

author: KlausKragelund
author_rank: Regular Contributor
timestamp: August 30, 2023, 11:04:04 pm
content: Seems the 8753ES has a known problem with YIG oscillator:https://groups.io/g/HP-Agilent-Keysight-equipment/topic/hp_8753c_caution_no_if/82863730?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,82863730So I need that fixed.https://www.eevblog.com/forum/repair/hp-5086-7781-yig-oscillator-tear-down-fits-85628563a-sa/
fluke 93 50 MHz scopemeter service manual needed( with 6 LCD driver chips not 5) - Page 1
Forum section: electronics / testgear

author: MostlyHarmless
author_rank: Newbie
timestamp: August 30, 2023, 01:28:08 am
content: I have a fluke 93 50 MHz scopemeter which does not power up, i am trying to find the correct version of the manual as my unit has an A1 Digital board with the six LCD driver chips as in the attached picture and not the 5 chip board as seen in the only versions of the service manual I've found online so far.i need the correct version to allow me to troubleshoot the On/Off circuit, i have high hopes as when probing with my oscilloscope i must have pulled something low that turned the unit on (just once and i cant replicate whatever i didDoes anyone have the full service manual and the layout diagrams for the fluke 93 with A1 Digital board with the 6 LCD driver chips

author: djsb
author_rank: Super Contributor
timestamp: August 30, 2023, 04:55:39 am
content: This is the only service manual I could findhttps://www.fnarfbargle.com/private/210702-Fluke_93-95-97_SM/93-95-97_SM.pdfHave you tried Fluke uk technical support?

author: MostlyHarmless
author_rank: Newbie
timestamp: August 30, 2023, 04:46:56 pm
content: Quote from: djsb on August 30, 2023, 04:55:39 amHi David,yes i have tried the tech support website with no luck. The only place i have seen the version i need mentioned is on a thread on here, that is where my picture attached is from and it shows the A1 digital board with 6 LCD controller chips (the same as mine) I am looking for the rest of the manual that the pic i have attached originates from. i need it for the ON/OFF circuit layout and description and test point positions, thanks for the link but i have that version already and it is for the a1 board with 5 LCD driver chips and basically a different digital board layout

author: Tom D
author_rank: Contributor
timestamp: August 30, 2023, 05:45:00 pm
content: The Model 93-95-97 manual linked above does indeed have six LCD driver ICs, these are three HD61104A and three HD61105A chips.The board you have pictured in your post is the Digital A1 PCB from the Fluke 105 Series II Scopemeter Service Manual. The earlier Model 93 does not have provision for a backup button cell battery holder (G1300). If this particular board is indeed fitted to your Model 93 ScopeMeter, it certainly wasn't built that way from the factory.Tom
Agilent HP 54645D 100 MHz Mixed Signal Oscilloscope and a 16 ch Logic Analyser - Page 1
Forum section: electronics / testgear

author: dazz1
author_rank: Frequent Contributor
timestamp: August 30, 2023, 03:40:41 am
content: HiI have started this new thread as a continuation of the thread buried here:https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg5003065/#msg5003065to make it easier to find for those with a similar question.I wanted/needed digital probes for my "new" old HP 54645D oscilloscope. Thanks to advice received, I purchased the probe, cable and grippers shown in the photos. This all appears to be new old stock or, more likely, unused accessories.This was a good score because these items were MUCH cheaper than the probe/cable unit specified for the scope.The items I purchased plug together making it possible to do things like make custom probe sets. This probe set adds a basic logic analyser capability to my modest inventory of test equipment.Most importantly, I got the bag with the genuine Hewlett Packard brand name, essential for bragging rights. None of this Agilent, Keysight rubbish. Just true blue.
Universal binary format for waveform storage - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: September 04, 2023, 12:12:11 am
content: http://github.com/brycecherry75/UniversalAWGBIN- I am currently seeking input from potential users.

author: ataradov
author_rank: Super Contributor
timestamp: September 04, 2023, 12:21:38 am
content: No comment on the format itself, sincehttps://xkcd.com/927/But this "all values are in big-endian form (Least Significant Byte first)" is a contradicting statement. LSB first is LE. And quite obviously LE is the best order for binary files like this.

author: slugrustle
author_rank: Frequent Contributor
timestamp: September 04, 2023, 01:07:38 am
content: What's the use case, more specifically? The docs in github say it's for AWG waveform storage. I'm curious to know the ways you think people might use this format.