hybridfree/eevblog-posts huggingface dataset:
Seintek P6100 - programmable power supply - Page 1
Forum section: electronics / testgear

author: Taviman
author_rank: Contributor
timestamp: March 25, 2023, 04:51:06 am
content: Hey there!I just purchased this power supply and the big G doesn't know much about it, outside some general data:Triple Output* DUAL Voltage, Ampere: DC+30V/3A, DC-30V/3A.* Fixed Voltage, Ampere: DC 5V/2A.Output: on / off controlKey Lock: key lock to avoid error operationProtection: overload voltage, ampere protection: (SMPS)protect over-heat and overloadCC, CV Set: auto setTracking: auto tracking14-bit Programming and the voltage, the read back of the current.Anyway, it has RS232 and I would be interested in controlling it via USB, the interface is a bit clunkyI don't have experience with GPIB, but I'm curious if there's a general solution availableDoes anyone has any proprietary software? My FW is 8.06What is this Seintek brand?BTW, the PS works great, it even has current limit in 5V output
Best (obtainable) Resistors for RF (MELF HF Replacements) - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: March 25, 2023, 01:25:40 am
content: I have two R&S FSH SA's (FSH3 and FSH6( I am working on that have Vishay MMA204 HF MELF 400mW resistors in the front end (68 Ohm and 100 Ohm 2%). The problem is no one seems to stock the 68 ohm part. So I am thinking about using standard surface mount resistors in place of these. I believe that 1206 parts will physically fit but I was wondering if anyone has experience with a particular brand that is best for RF use. Thick Film? Thin Film? I would think that the trim method used would affect the inductance and the form factor and placement would affect the capacitance. Attached is a picture of the front end and tracking generator attenuators in the analyzers.Thanks for looking!Sam
LCR6200 inductance meter - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: March 24, 2023, 09:08:22 am
content: Hi,Do you know what source resistance to choose..its either 30R, 50R, or 100R?Also, what does the "L force" input mean?Also, "H force"?I measured some inductors but its well inaccurate.I did all the opan and short calibration/initialisation steps.LCR6200https://www.farnell.com/datasheets/2267000.pdf

author: coromonadalix
author_rank: Super Contributor
timestamp: March 24, 2023, 10:52:42 am
content: Do you work with kelvin probes ? show photos of your probesthe "L" side will touch together on one side on the part to be measuredSame for the "H" sidehttps://www.allaboutcircuits.com/textbook/direct-current/chpt-8/kelvin-resistance-measurement/Unless some damages happened ?

author: Faringdon
author_rank: Super Contributor
timestamp: March 24, 2023, 01:46:46 pm
content: I am getting a Lsec measurement of 7.5uH...and primary of 480uH.Thats 8:1 and it surely cant be that much in this design.I am wondering if the intercoil capacitance is making the sec coil inductance look much lower than it really is.?The Sec coil, with the "Ls-Q" measurement comes out as 7.5uH and Q=12.Q=12 sounds high, i am wondering if there is loads of intercoil capacitance and the inductance reading is thus coming out low.
HP 5334A service manual? - Page 1
Forum section: electronics / testgear

author: usuthu65
author_rank: Newbie
timestamp: October 25, 2019, 01:31:03 am
content: Hi all,Trying to find an online copy of the HP 5334A universal counter service manual. I can find the 5334B but not the -A. The goal is to see whether it is possible to field install the better OCXO (Option 010 originally; 10811A oscillator) into a 5334A that does not have it already, and what that would require. The main board clearly has a multipin connector and an outline where the Option 010 goes, but I don't know more than that. Perhaps the idea is a non-starter.. Searched the web and here to no avail.Thanks in advance.

author: 0culus
author_rank: Super Contributor
timestamp: October 25, 2019, 01:39:15 am
content: Artek has it:http://artekmanuals.com/manuals/hp-manuals/It will cost $10 to get the operating manual and service manual together, but it's worth it because their scans are way better than the free junk (even from Keysight) and OCRed to be searchable.

author: ekoloski
author_rank: Contributor
timestamp: March 24, 2023, 12:57:29 am
content: I am a little late to the party on this one, but I'll reply back in hopes that it helps someone out. Yes, you can field install this option, the steps outlined in the manual for the 5334B work just fine.It's been a while, and I'll need to dig through some old project files for the details. What I do remember is that you need to unsolder and move C8 to C100. I also built a small board to mount the ocxo, provide 12v and add support for electronic frequency control. I then took a panel mount 10-turn potentiometer and stuck it through the back so the unit can be calibrated without opening the case. Finishing touch is a small panel mount LED on the front panel at the top right which indicates that the oven is still warming up and measurements should not be trusted.If you are still looking to do this mod, let me know. I'll post the project files.
Hung Chang 5604 voltage multiplier - Page 1
Forum section: electronics / testgear

author: HMartins
author_rank: Newbie
timestamp: March 21, 2023, 07:12:27 pm
content: Hi.I have a Hung Chang 5604 oscilloscope whose CRT (150CTB31) voltage multiplier is faulty. Works nicely until some hours after when scope display 'zooms in'.All voltages around high voltage transformer drop to around 1/3 of the normal. Overload security diodes of the transformer power transistor start to drain current from transistor base. This avoids full disaster.After isolating the multiplier input all voltages come back to normal.In the (quite simplified) manual there is no reference to the multiplier. Could it be a doubler, tripler...? In normal circumstances the multiplier input is 2400Vpp, sort of sinusoidal.For the moment I will close the unit and install a small fan on top to keep it cooler.Inhttps://www.eevblog.com/forum/testgear/beckman-industrial-9102-scope-problem/msg1587742/#msg1587742... it says this CRT (150CTB31) it is a 10KV unit. Could someone help me figuring out whet type of multiplier it mast use (doubler, tripler, quadrupler?...) providing the transformer supplies 2400Vpp?Any help is highly appreciated.RegardsHenrique Martins

author: jonpaul
author_rank: Super Contributor
timestamp: March 21, 2023, 07:21:21 pm
content: usually a tripler. Very common part.Otherwise failures in CRT HV are,high-voltage resistors, and,the HV transformersJonpaul@ix.netcom.com

author: HMartins
author_rank: Newbie
timestamp: March 23, 2023, 07:37:45 pm
content: Thak you for the answer.H. Martins
Advantest R3131 freezing - Page 1
Forum section: electronics / testgear

author: elettronica52
author_rank: Newbie
timestamp: March 23, 2023, 09:44:27 am
content: helloI would like to buy a faulty advantest R3131.it turns on but when it has passed 4 tests with ok it stops with a white screen and does not proceed.some advice?Pier
Repair Rohde & Shwarz FSH3 Portable Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 29, 2016, 01:10:43 am
content: Hi group,I was inspired by the excellent Video posted by Shahriar on the Signal Path YouTube Channel:And discussed here in the EEVBlog Forum:https://www.eevblog.com/forum/testgear/teardown-repair-analysis-of-a-rohde-schwarz-fsh3-3-0ghz-spectrum-analyzer/msg723839/#msg723839I bought a FSH3 at the Rochester Hamfest today. I was hoping to get the same problem ;-).I have been given a different challenge.My unit turns on, it beeps, and displays a blue screen.I have used a scope and probed around the LCD connector. I can see some signals that look like video signals. For example I can see a narrow pulse with a Frequency of 63Hz. This looks like the Vertical Sync.I don't have any schematics.I hear that some of the circuitry is similar to the Fluke 190 series scopemeters.The display is khs057qv1cr-g01.Does anybody have an information on the display module or a schematic for either the FSH3 or a color Scopemeter LCD section?Thank you for your help with this.Regards,Jay_Diddy_B

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: May 31, 2016, 03:04:59 am
content: Hi,I have done a little more troubleshooting. I have found that the Fluke 192B/196B-C/199B-C Service manual contains some useful information.I found that this section matches the same section on the R&S FSH3 SA:If I measure the outputs on the 33174 Quad Op-amp, I got proportional voltages, but all of them were low. I measured the voltage on pin 4 of the 33174 it was also low around 5V instead of 30V.The power supply on my FSH3 does NOT match the power supply that is documented in the Scopemeter manual:(The schematic seems to match the power supply in Shahriar's FSH3).I examined the board carefully, and I found a burnt resistor. I also measured 6 Ohms across two decoupling capacitors. I removed the capacitors, but the 6 Ohms remained. I removed a chip with a topmark 'LBHM'. A quick google search revealed that the chip is an LT3471.Link:http://www.linear.com/product/LT3471This chip is a Boost / Inverter in a 3 x 3mm DFN.This could be used to generate the 30V needed by the LCD supply.I have ordered the part from Digikey.Regards,Jay_Diddy_B

author: thm_w
author_rank: Super Contributor
timestamp: May 31, 2016, 09:05:20 pm
content: Is the 84P diode on the left cracked?

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: June 01, 2016, 03:23:55 am
content: thm_w,I am away from the unit at the moment, I only have the photographs to look at. I will check when I get home.I suspect the diode is a B4p. B4 is used for 40V 0.5A Schottky diodes.Thank you for the tip.Regards,Jay_Diddy_B

author: scopeman
author_rank: Frequent Contributor
timestamp: March 22, 2023, 10:07:42 pm
content: Were you able to fix yours? I just bought a FSH6 at a hamfest and it appears that someone bypassed the attenuator chip. What a mess.SamW3OHM
Identify test point connector Philips PM5193 - Page 1
Forum section: electronics / testgear

author: gmac34
author_rank: Regular Contributor
timestamp: March 28, 2023, 09:44:18 pm
content: Hi, I wanted to go trough the calibration procedure for my Philips function generator, but this involves hooking up to a series of test points that have a coaxial connector that I cannot recognise, the manual mentions that the service kit would include cable adaptors but doesn't seem to mention the connectors in the part list.Before I MacGyver something, does someone recognise them, so I can search for a matching connector?Thanks !

author: Kim Christensen
author_rank: Super Contributor
timestamp: March 28, 2023, 09:55:22 pm
content: It almost looks like something you could insert a scope probe into.

author: gmac34
author_rank: Regular Contributor
timestamp: March 28, 2023, 10:25:24 pm
content: I thought that as well, the inner diameter of the ground is 3.5mm which is a standard probe size, but the center pin is not a "tube", it's just a pin, this on the board appear to be the male side of this standard, so a probe would not mate there properly.
Power Designs 2005A Heater Circuit - Page 1
Forum section: electronics / testgear

author: BarryBreaux
author_rank: Contributor
timestamp: March 21, 2023, 05:04:02 pm
content: Hello,I have made a lot of progress on my PD2005A. I have replaced all the burnt components in the oven and I am getting good results on the output. I have designed a new circuit to do PID control on the heater. I am currently looking closely at the PD heater circuit to see if I want to interface with it or roll my own. So now you know where I am going...I can't get my head around the PD heater circuit which consist of a few resistors, a SCR, and an NPN resistor. I put it in a simulator and can't get it to function properly simulating the thermostat. I don't know if my 2005A is functioning correctly. If you understand how this circuit works I would appreciate enlightment.ThanksBarry
EMC probe use - Page 1
Forum section: electronics / testgear

author: Grandchuck
author_rank: Super Contributor
timestamp: March 06, 2023, 04:49:29 pm
content: These are inexpensive but seem useful:https://www.ebay.com/itm/334526399735The picture below shows them applied to a power module. The module conditions:Input 8 vdc @ 0.36AOutput 12 vdc @ 0.2AE probe channel 1H probe channel 2Seems that using EMC probes might also be useful when designing and/or troubleshooting. Does anybody here do that?

author: nctnico
author_rank: Super Contributor
timestamp: March 06, 2023, 09:47:38 pm
content: These kind of probes are useful indeed to find sources of certain frequency bands on a PCB. They should be in everyone's toolbox who is dealing with EMC problems.

author: pdenisowski
author_rank: Super Contributor
timestamp: March 06, 2023, 11:07:12 pm
content: Quote from: Grandchuck on March 06, 2023, 04:49:29 pmYesI actually made an introductory video on the topic

author: pope
author_rank: Frequent Contributor
timestamp: March 07, 2023, 08:59:50 am
content: These seem to be out of stock everywhere (ebay, amazon, aliexpress).Do you have any other source that can be purchased from?

author: oddbits
author_rank: Newbie
timestamp: March 07, 2023, 10:31:21 am
content: Loads on ebay china sellers , for as little as £9 with free postage , just ordered a set ..Hope links are ok ?.

author: Xandinator
author_rank: Contributor
timestamp: March 21, 2023, 02:05:55 am
content: If you want to go cheap, you can even build them yourself, Dave put up a video:

author: jonpaul
author_rank: Super Contributor
timestamp: March 22, 2023, 01:07:26 pm
content: zero cost probe1m RG174/U, wind 10t in 10..25 mm dia coil.Terminate centers to BNC connShield is connected at one end only to BNC rtnFinished with insulation dip, tape or similarJon

author: Grandchuck
author_rank: Super Contributor
timestamp: March 22, 2023, 04:11:09 pm
content: Here is a nearly zero cost E probe. It is shown compared to the one in the assortment that I recently bought . It has been insulated since the photo was taken. It outperforms the one at the top by a wide margin ... much less unwanted 60 Hz noise susceptibility.
What is difference between Rigol MSO1074Z-S and Rigol MSO1074Z- S Plus versions - Page 1
Forum section: electronics / testgear

author: Noize
author_rank: Regular Contributor
timestamp: March 20, 2023, 09:55:47 pm
content: As above.Is it because the plus just has the upgrade options already included. I tried google and didn't have much luck.I just sold on ebay MSO1074Z-S 16 digital channel(with logic probe) 2 waveform generators with all options including bandwith upgrade(100MHz) . The buyer has said he didn't realise it wasn't a plus version. And has already paid for it. I would like experts knowledge.

author: thm_w
author_rank: Super Contributor
timestamp: March 20, 2023, 11:14:31 pm
content: The "S" has signal generator.Plus is the options.If you have them enabled already, then let them know everything is there already I guess?https://www.rigolna.com/products/digital-oscilloscopes/1000z/

author: Noize
author_rank: Regular Contributor
timestamp: March 21, 2023, 02:50:42 am
content: On my Ebay selling post I had a picture of the my options screen. All options enabled.https://imgur.com/a/ZdBV9Vfhttps:This is the ebay sale.https://www.ebay.co.uk/itm/125819519225

author: aristarchus
author_rank: Regular Contributor
timestamp: March 21, 2023, 05:32:17 am
content: Ok, Rigol naming is making things a bit confusing.MSO1xxxZ == DS1xxxZ Plus + RPL1116DS1xxxZ is NOT DS1xxxZ PlusThe 'Plus' in DS1xxxZ naming is the 16 port digital connector, 'Plus' have it,non Plus do not have the digital connectorfor the RPL1116.The MSO1xxxZ is the OLD naming that Rigol uses, until 2018 to give bundled the DS1xxxZ Plus including the RPL1116.After 2018 they stopped this and no more MSO1xxxZ bandles are produced, Rigol decided to sell separately the DS1xxxZ Plus and the RPL1116 interface.(Got a DS1104Z Plus here and bought separately the RPL1116)So asked Rigol about this naming confusion and go this reply sometime earlier for another issue that I hadFrom: Boris A****g <******@rigol.com>Date: Mon, Mar 6, 2023 at 5:17 PMSubject: RE: You got one.RIGOL Technologies EU GmbHCustomer messageTo: ****** <******>Cc: ****** <******@rigol.com>Hi ******,Brian is now on business trip, so I will answer.We stopped the sales of MSO versions in 2018 and offered only DS1000Z Plus version (with the principle, when customer require the MSO functionality, to purchase the logic probe).So the name is DS10xxZ Plus and not MSO. This name will and cannot be changed.Best regards,BorisMit freundlichen Grüßen/With best regardsBoris A****gRIGOL Technologies EU GmbHCarl-Benz-Str. 1182205 Gilching+49 (0)8105 - 27292-16E-Mail: ******@rigol.com
Agilent U1242A "problem" ? - Page 1
Forum section: electronics / testgear

author: PwrElectronics
author_rank: Regular Contributor
timestamp: February 12, 2023, 08:06:38 pm
content: I was working on a old capacitor analyzer that uses tubes.I went to check for excessive ripple on the electrolytic filter caps after the rectifier tube.... This unit is near 60yrs old and I don't think its been powered up since possibly the early 90s.So, my Agilent U1242A measures ~450VDC on this cap. I then switched the meter to AC voltage. The meter is "going crazy" in that it was momentarily showing >1kV of AC and then dropping down to a few hundred. Even weirder, the value rises and falls on a interval of a couple of seconds.Needless to say, very puzzling and concerning.So, I get a scope out with a 2kV, 100x probe and check the same with that. I get about 5V p-p with scope on AC coupling and the same DC as the meter reported in DC mode. Also, there are no spikes or other waveform stuff going on that would possibly explain the DMM from having a fit.Any ideas ?

author: PwrElectronics
author_rank: Regular Contributor
timestamp: March 25, 2023, 11:24:18 pm
content: So, I got back to investigating this issue....Seems like its something to do with the way the DMM firmware calculates the RMSand the autorangingSetting a specific range on the AC would seem to prevent erratic readings.Posted some test results comparing this to my other meters on the 'tube...https://youtu.be/pZBK4lut3Gs
riden power supply - Page 1
Forum section: electronics / testgear

author: mastershake
author_rank: Frequent Contributor
timestamp: March 20, 2023, 07:57:15 pm
content: another question for my student. im thinking of him just going with the 6024 or is there a reason he should go for one of the lower output models. im thinking this way he will have more then enough to use it for most anything under the 65 ish volts vs needing multiple units for different amperage. so other then the extra digit would you say there is any advantage other then noise to going with a smaller output unit? maybe im thinking about this all wrong for him (currently dealing with chemo brain i hate to say)once again i appreciate it

author: tatel
author_rank: Frequent Contributor
timestamp: March 21, 2023, 01:17:09 am
content: A linear PSU wouldn't be "better"? Something like a Korad? I recently got a WuZhi5005 knockoff and happy with it, but it's to feed motors. My Korad KA3005P has *much* less noise. And IIRC, would be cheaper than a complete 6024 kit -frontend+case+PSU. Not so much ooomph as the RuiDeng thoughI hope you'll get better health soon.
R&S FSH6 Repair and Advice Needed - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: March 20, 2023, 04:47:45 pm
content: I picked up a Rohde & Schwarz FSH6 that reportedly had a problem with the front end attenuator chip. When I opened the RF sectionI saw bodge wires in the attenuator section over the top of what I believe to be the Macom 6GHz attenuator chip.Anyone in the group that has a FSH6 ever seen anything like this? It just does not look to me something that R&S would do. Sobefore I go any farther and attempt to change the chip I thought I would ask here if anyone (perhaps a tech that works on these) has seenanything like this before.I believe that this is the attenuator chip:https://www.mouser.com/ProductDetail/MACOM/MAAD-007083-000100?qs=6rSQ3%252BFDZXmLotzEkbwQjw%3D%3DThanks to allSamW3OHM
Adapter iFak isCAN USB DIY - Page 1
Forum section: electronics / testgear

author: Postal2
author_rank: Frequent Contributor
timestamp: March 20, 2023, 02:35:07 pm
content: You can make this expensive adapter from cheap components. Sorry for schematic quality, have no time.

author: simba15
author_rank: Regular Contributor
timestamp: March 20, 2023, 03:05:26 pm
content: Can we know more?Diy Can adapter would be useful!

author: Postal2
author_rank: Frequent Contributor
timestamp: March 20, 2023, 04:45:23 pm
content: I made it for various vendors software, works fine. What exactly you need to know? I seem schematic is readable, need to be some advanced of course.

author: simba15
author_rank: Regular Contributor
timestamp: March 20, 2023, 05:23:43 pm
content: I see the schematic , but I am unsure of the main IC's used.What are the modules shown in the pictures? seems to simply the assembly.Any firmware required?Thanks.

author: Postal2
author_rank: Frequent Contributor
timestamp: March 20, 2023, 08:05:10 pm
content: Main IC is accordingly to filename is CY7C68013A-128 (cheap). Small ICs are SN74LVC1G02 (74AHC2G08 is not need and was bypassed). Schematic is reverse-engineered from working device.Firmware is there in file "iic" - it is for eeprom, as usually for fx2lp.Small module is SJA1000 module, but need change crystal to 24MHz (it is more stable). Constantly powered. Isolation not used.
Rigol DS1104Z PLUS CAN Bus ?? - Page 1
Forum section: electronics / testgear

author: Bionicbone
author_rank: Contributor
timestamp: March 20, 2023, 08:37:48 pm
content: I've almost decided to press the button on this, but I have an ongoing CAN Bus project that I'd built an ESP32 to read the CAN on a Land Rover, doing quite well reverse engineering. But looking at this scope I need to go up to the DS2000 series to decode CAN Bus. Is that correct? I see cheaper Hantek and Siglent scopes that come as standard. Can anyone recommend options, any hacks? I'm just a tinker type person, like bus data thus 4 channels preferred and hoping to learn some new stuff but accuracy is important to me, no point having a scope that's displaying crap that I don't understand and believe it lol. thanks

author: 2N3055
author_rank: Super Contributor
timestamp: March 20, 2023, 08:41:05 pm
content: DS1104Z does not support it. You have to use something else.

author: Bionicbone
author_rank: Contributor
timestamp: March 20, 2023, 09:02:52 pm
content: Thanks, as always once I posted that the first thing I found was it's better to use a cheap logic analyzer or probably what I'm already doing than mess with a scope .
Siglent SDS2202X-E firmware donwload stuck at 1.1.19R5 since mid-2020. Why? - Page 1
Forum section: electronics / testgear

author: RoV
author_rank: Regular Contributor
timestamp: June 02, 2022, 09:51:55 pm
content: By searching SDS2202X-E on eevblog, I find several results talking about release 1.1.20R3, that seems to be distributed with new scopes since at least last October (see e.g.https://www.eevblog.com/forum/testgear/siglent-sds2202x-e-roll-pk-pk-bug/msg3764744/#msg3764744).There are several known bugs on the 1.1.19R5, one also discovered by me (at least I think), this one:https://www.eevblog.com/forum/testgear/sds2202x-e-fpga-bug-or-broken/msg3518718/#msg3518718. I can confirm that 1.1.20R3 solved that particular problem, because I could find it in an unofficial site (russian link) thanks to user "rea" on September 2021.So, why doesn't Siglent publish updates? Is perhaps the new release problematic with old hardware versions and they are trying to hide this fact?Also 1.1.20R3 has bugs: the first link that I cited talks about one; I recently discovered another: when going in history mode and activating "List", the field "hour" of "Activation time" doesn't count correctly, resetting to zero a few minutes after reaching one and never going above one. I discovered this using the Ethernet connection (with VISA) to extract a long series of frames automatically.What should we expect for the future? Tautech, you are always very helpful in the forum: do you have any news on this?Any Siglent people can answer?Regards,

author: 7thSenpai
author_rank: Contributor
timestamp: June 07, 2022, 12:51:31 am
content: I've been waiting for a official 1.1.20 release as well. 1.1.20R3 has a bug where I can't pin point how and when it starts effecting the scope exactly, but the bug is noticeable when using math fft. After some period in time even after reboots, after disabling the math function and previously was set to fft, the scope preforms really slowly as if the fft math function is enabled. Only when you go into math and set it to + or something less compute intensive that the scope becomes responsive again.

author: 7thSenpai
author_rank: Contributor
timestamp: March 20, 2023, 09:04:24 am
content: Since official firmware has been released and have updated to it. Which I really think is a identical file.. I thought I report that this scope needs to turn off measurements and what I said above if you are experiencing scope unresponsiveness, as in turning vertical or horizontal knobs take you like 10 rolls to make a change..I've also experienced some freezes and had to power down. This scope can be annoying. If I ever buy a new bench scope its going to be Keysight.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 20, 2023, 10:35:00 am
content: have sent an PM to tautech before posting ?Thes is an already made thread about theses, why starting a new one ?
Need cheap Single phase power quality analyser? (Mains Harmonics tester ) - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: March 19, 2023, 04:24:03 pm
content: Hi,We are testing an offline SMPS of 150W, and need a Mains Harmonics tester which can give the harmonics 1 to 39.Do you know of the cheapest one?We are testing to EN61000-3-2.SMPS is from 100-265VACWe know the Yokagawa WT210, and the Voltech PM1000, but wish to use the cheapest.HA1600A is nice but £2150https://www.tester.co.uk/aim-tti-ha1600a-power-and-harmonics-analyser-uk-schuko-usa-plugWhat about this for measuring THD up to 19th harmonic...and 3 rd harmonic?https://uk.vicedeal.com/products/harmonic-distortion-analyzer-ac-power-harmonic-analyzer-10hz-1khz-distortionanalyer-2?variant=UHJvZHVjdFZhcmlhbnQ6MjI5MDMyNzIx&gclid=CjwKCAjw5dqgBhBNEiwA7PryaIWUjGspIsAB1IxlQIQRXsJGcrLH05LOpR7MbfWKWLmumilJU6cX9xoCVZ4QAvD_BwE....its only £39
Has anyone  Manual for ESI 293 universial impedance birdge ? - Page 1
Forum section: electronics / testgear

author: madao
author_rank: Frequent Contributor
timestamp: March 19, 2023, 02:38:20 pm
content: HiI got 200kg test equpiment, two RCL Meter/birdge included. (one is famous GR 1650 )ESI 293, i am looking after manual to fixing of him.Has anyone ?RegardsMatt
ET4401/4090A etc., Bench Top LCR Meters Query? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 20, 2023, 10:46:07 pm
content: Hi!Regarding the East Tec LCR Meters and their 4090A/4090B/4090C clones, has anyone determined exactly all the chips that are employed in these instruments?I know there's one very large QFP device that appears, from all the available pictures I can find, appears to have its number sanded off – has anyone determined what it is?Chris Williams

author: Martin72
author_rank: Super Contributor
timestamp: March 20, 2023, 11:20:22 pm
content: Hi Chris,I´ve started to make a schematic from a ET4410:https://www.eevblog.com/forum/testgear/east-tester-et4410-esr-measure/msg4331890/#msg4331890There are lots of op-amps and cmos switches there.Pics from the inside:https://www.eevblog.com/forum/testgear/east-tester-et4410-desktop-lcr-meter/msg4002337/#msg4002337The µC is an ARM STM32..

author: Chris56000
author_rank: Frequent Contributor
timestamp: March 21, 2023, 01:05:45 am
content: Hi!They've clearly not sanded the numbers off on the sample you've posted your pictures from!Could you email me your pictures please Martin?PM sent.Chris Williams
Micsig DP10007 cable / connector mods? - Page 1
Forum section: electronics / testgear

author: larry42
author_rank: Regular Contributor
timestamp: March 19, 2023, 08:57:43 am
content: Anyone have modification recommendations on how to make the DP10007 more amenable to SMD probing?Also - is the output cable a special (damped) oscilloscope probe cable or ordinary 50Ohm coax? I'd like to put a better connector on this to avoid damage to the high precision BNC inputs on my RTE1000 series scope.
Should I get an ANENG MH12 or UNI-T UT501A isolation resistance meter? - Page 1
Forum section: electronics / testgear

author: mandelbrot99
author_rank: Newbie
timestamp: March 21, 2023, 07:44:35 pm
content: Hey there, after following Dave's YouTube channel for years, I figured now is the time to make an account on this forum, as I did not find any info on my current questionI'm in the middle of a complete electrical renovation in a house we inherited, and before we hand over our work to the electrician to install the fuse box, I want to test my work by running isolation tests on all parts of our electrical work.Since I'll only need this for a few occasions, I won't get a Fluke, but I found two budget devices: the ANENG MH12 (https://de.banggood.com/ANENG-MH12-Insulation-Earth-Resistance-Tester-Digital-Meter-AC-DC-Ammeter-Transistor-Tester-LCD-Megohmmeter-Meter-Voltmeter-Detect-p-1964522.html) and the UNI-T UT501A (https://www.amazon.de/Isolierung-Widerstand-Tester-Isolationsmessger%C3%A4t-Isolationstester/dp/B07CB4QFBL).Looking at the two, the ANENG seems to have nicer probes and the build quality *looks* better too (but that's obviously hard to tell from the picture). I couldn't find many reviews on the ANENG though, the UNI-T has more.What do you think? Are there personal experiences for both companies? Do you even own one of the devices? I'm helpful for any hintCheers!

author: Tjuurko
author_rank: Regular Contributor
timestamp: March 22, 2023, 04:24:47 am
content: UNI-T UT501A is a "classic" meter of insulation resistance, and ANENG MH12 a "smart" meter.ANENG MH12 in addition to resistance, he can measure PI (Polarity Index) and DAR (Dielectric Absorption Ratio).The maximum displayed resistance value of in ANENG MH12 at the limit of 500/1000V is 20.99 GΩ.The insides ANENG MH12 (real name of the model HYTAIS TS58/TS68):

author: indman
author_rank: Super Contributor
timestamp: March 22, 2023, 09:16:40 am
content: Here is a similar topichttps://www.eevblog.com/forum/testgear/just-ordered-aneng-mh13-insulation-resistance-meter-any-comments-on-the-spec/msg4640809/#msg4640809
TDS724D, Error: nvLibrariansDiag, libs with crcc failures: State, worth buying? - Page 1
Forum section: electronics / testgear

author: sako
author_rank: Newbie
timestamp: November 12, 2022, 04:16:12 pm
content: Hello,I am planning to buy TDS724D.The oscilloscope is passing power on self check.I asked seller to run self-test and run calibration.In self test log I can see message: ERROR: diagnostic test failure nvLibrariansDiag, Libs with crcc failures: , StateI attached pictures with log and call results.I want to ask, what can cause this error? And how easy/hard is to fix this?

author: Tantratron
author_rank: Frequent Contributor
timestamp: January 15, 2023, 09:56:41 am
content: Did you finally purchase the oscilloscope ?

author: sako
author_rank: Newbie
timestamp: March 18, 2023, 04:57:01 pm
content: Yes, it works good.
EL300 DC load and obsolete Motorola Transistor SJ1891 - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: October 31, 2017, 12:04:37 am
content: I picked up a working 60A, 60V DC load ---- AC/DC Electronics EL300 for $25I found a manual online that includes the schematics. Looks like it uses SJ1891 output transistors, I have searched high and low for a data sheet, does anyone have a clue what an appropriate substitute would be?Looks like this:

author: Vgkid
author_rank: Super Contributor
timestamp: October 31, 2017, 01:26:13 am
content: I will need to look on my old computer i believe it was a to -204 , 2n62xx. It was 20 - 30a NPNQuick mouser look suggests 2n5886 , or 2n6341.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: November 01, 2017, 04:38:40 am
content: Quote from: Jester on October 31, 2017, 12:04:37 amSJ were house numbered transistors so very little information is available.In this application I would use a 2N3773 or MJ15024. Both of these are high power audio transistors.Pay attention to Safe Operating Area curves, particularly the second breakdown limits.It goes without saying, that you have to watch out for fakes.Regards,Jay_Diddy_B

author: Indirtwetrust
author_rank: Newbie
timestamp: June 28, 2018, 08:44:47 pm
content: Did you have any luck finding a suitable replacement? I just st got a hold of EL750B and I need the same part

author: David Hess
author_rank: Super Contributor
timestamp: June 30, 2018, 03:54:41 pm
content: It would help to see a schematic, a photograph of the transistors where they are mounted, and a photograph of the transistor tops.

author: thermionic1
author_rank: Newbie
timestamp: March 18, 2023, 11:08:54 pm
content: Sorry this is way late, but I have also just purchased an EL-750, needing some pass transistors. I found that elsewhere on the schematic they are identified as 2N5886, so logical substitutes would be 2N6341 and 2N6338, or TIP35 in a different package.
Help on an old "CTR Mod. SG-25" Signal Generator - Page 1
Forum section: electronics / testgear

author: Maister
author_rank: Contributor
timestamp: March 17, 2023, 11:40:14 am
content: Hi,I purchased an old used Signal generator from eBay. It is the "CTR Mod. SG-25".Frequency Range is 120kHz to 500MHz. Selectable in 5 Bands.I attached the "manual" together with its schematic to this thread. (soory its only in german, but schematic everyone should be able to understand)For some reason I thought I would get a clean sine wave out of it but the signal coming out, I measured with an analog discovery (USB scope), looks like the negative half is cut off.This can also be seen on the attached picture.The device only features 4mm banana jacks and no BNC. So for probing I attached 2 twisted leads from 4mm banana to pin header of analog discovery. Analog discovery is high Z input btw. not 50 ohms.The measured frequency is around 700kHz so I don't think this bad result is due to the bad probing setup.Does anyone know if this output waveform is normal for these old kind of signal gens, or might there be something broken with the unit?Also the amplitude varies when frequency is changed, which is annoying. Is that also something one could expect from those old units?Thanks for any helping comments and thoughts about this.Cheers,Patrick

author: Specmaster
author_rank: Super Contributor
timestamp: March 17, 2023, 12:57:05 pm
content: I used to have one of those with another name, it was sold with lots of people badging it, but it is a reasonable generator for AM radios. It does however need to have capacitor in series with the output leads, this will help to improve the waveform by blocking any DC leakage.

author: Maister
author_rank: Contributor
timestamp: March 17, 2023, 02:17:11 pm
content: yes, you can see the DC on the attached waveform.However, a series cap will not remove the clipping.
Looking for an affordable RF vector signal generator - Page 1
Forum section: electronics / testgear

author: setu
author_rank: Newbie
timestamp: January 05, 2018, 10:08:34 pm
content: I am looking for an RF vector signal generator, at least up to 2.5 GHz range. The goal is to generate custom modulated packets of data in the 2.4 GHz ISM band, e.g. a simple packet would be 2-level GFSK @ 1 MSPS (1 symbol = 1 bit for this example here), where each packet has <= 10,000 symbols. The output power should be programmable in 1 dB or lower increments over at least some range. Ability to have some repeat the data packet at a fixed interval would be nice. The software used to create such a custom packet is important to me to make programming the instrument easier. Ability to output the baseband IQ waveform would be a nice-to-have, but not strictly necessary. The budget is ideally in the $500-$1000 range. All other things being equal, a lighter and smaller form factor (non boat-anchor type) device is preferable, but this is also not a primary concern.Options I have found areAgilent E4432B / E4433B, used seems to be in the $1K rangeSignal Hound VSG25, $495 newTriarchy VSG6G1, $441 newHP 8780A, about $1K range on eBayDoes anyone have any recommendation or experiences or other options to share?Might need a step attenuator or something to get higher output power range, so any thoughts on that are welcome too.

author: drew23
author_rank: Contributor
timestamp: March 17, 2023, 04:03:11 am
content: Hi.What vector signal generator did you get?I have just bought a Triarchy VSG2G5C. There does not seem to be much on the web about them.Regards Drew VK4ZXI

author: wasedadoc
author_rank: Super Contributor
timestamp: March 17, 2023, 10:58:03 am
content: It is more than 2 years since the OP last logged in. Do not hold your breath waiting for a reply.
Vu-Data 2521 Oscilloscope Seeking Schematic/User Guide/Servicing - Page 1
Forum section: electronics / testgear

author: 6CW4
author_rank: Newbie
timestamp: March 16, 2023, 10:06:22 pm
content: Hello,I purchased a non-working Vu-Data Model 2521 Oscilloscope recently that the seller that said it has no display.I would appreciate obtaining a copy of the schematic/servicing data/user guide to start diagnosing the problem. I've searched the Web but have not found anything.Thank you,Paul K.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: March 16, 2023, 11:06:28 pm
content: I repaired a VU-Data scope years ago.I could not find a schematic.I did find out however that they were mostly Tek clones so a Tek schematic for a similar scope was the same as far as I could tellI used the Tek information I could find and that worked out just fine.Try to find a Tek scope with the same bandwidth etc,,,
Problem & fix connecting Sensepeek probes to Siglent scopes - Page 1
Forum section: electronics / testgear

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: March 16, 2023, 07:06:54 pm
content: Hi everybody.I recently invested in a set of those brilliant Sensepeek gravity probes, but immediately ran into a problem when connecting to my Siglent scope.Being an entry level scope, the Siglent SDS12xx series does not have a metal ring that detects x10 probes. What is does have, is some cuts that allow the BNC jack to be pushed through the case.Now, that causes a problem, because the spring loaded x10 pin goes into the cut in the case and the probe is stuck. To get it loose, you need to pry the pin with some tweezers and retract it.To fix this, I 3-D printed a small ring that fills the gap in the scope, allowing the x10 pin to slide without locking into the cut.The STL of the part is attached. You may need to trim it a bit with a cutter knife depending on your 3Dprinter. Install it with the gap in the 8 o'clock position , that way the pin never slides across the gap.
BLDC motor BL_Heli ESC beacon triggering every PSU OCP I've tried; any solution? - Page 1
Forum section: electronics / testgear

author: Fractal
author_rank: Contributor
timestamp: March 15, 2023, 11:16:47 am
content: Hi!I know this might be very specific to drones and automation but I will try to make it comprehensiveI've had this issue when powering certain drone ESCs through a linear bench PSU where the startup beacon seems to trigger OCP thus failing to startFor anyone that has worked with BL_Heli ESCs, it is the bootup tone you hear on startup that is produced by exciting the motorsMy previous PSU (a fairly old motech/amrel LPS-305 triple output) had a pretty long transient response time of 200us, which I assumed to be part of the issue, so I upgraded to one with a much lower value of <50us (a 2007 Motech/BK Precision LPS-505N), but that didn't resolve it!Even when setting both main outputs in parallel to double the current capacity to 6A, it just won't start, keeps triggering OCP and rebootingSo far I've also tried using fatter leads, adding a small capacitor, but still no beans.Does that sound in any way like an issue you've experienced before?The weird part is, it only does it with some of the smallest size 1S motors; 0802-1002 19-25000kv spinners. Even my larger 1S 18650 Wingman with 1202.5 11500kV spinners -and the same ESC manages to start fine.And of course 3" 3S, 4S and even 5" 5s are no issueHow could it be?Could using a larger cap/cap bank to further smooth out the transients help? how would I measure/calculate the capacitance required?Thanks!

author: thm_w
author_rank: Super Contributor
timestamp: March 15, 2023, 10:42:13 pm
content: What capacitor did you try?Some of these ESC's have multiple capacitors on the input, 1000's of uF. Would resolve the issue if you added enough capacitance, and the continuous draw of the ESC is less than 6A.You could use a scope to measure the voltage at the ESC and see how much it dips.A single 18650 battery can put out 10 to 30A continuous current or more depending on the model. A 3A linear power supply is not even close to that.

author: james_s
author_rank: Super Contributor
timestamp: March 16, 2023, 04:14:53 am
content: I would try a much larger capacitor, perhaps 20k uF. You could also try and find a schematic for the power supply and add a capacitor to the OCP circuit to make it respond slightly slower.

author: Fractal
author_rank: Contributor
timestamp: March 16, 2023, 11:01:58 am
content: Good points; I've only tried a couple 500-600uF caps that came with some larger-size ESCs for power filtering.I'll see if going much larger resolves this on a special power lead; Not sure about adding one internally as it would permanently reduce it's OCP reactivity

author: james_s
author_rank: Super Contributor
timestamp: March 16, 2023, 04:54:26 pm
content: If that doesn't work, add a resistor between the PSU and capacitor to limit the max current.
Siglent SDM Calibration Files - Help wanted to test ! - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: March 02, 2023, 08:36:17 pm
content: Hi All,Some of you may know that I built the SDM3065X, SDM3055, SDM3045X calibration file generator site:https://www.thedefpom.com/siglent_sdm_calibration.phpI haven't had a lot of feedback about it so I don't actually know if all of the files are working correctly.I am hoping that people out there with the SDM3065X, SDM3055 or SDM3045X that have tried using the site will post the results of trying to use the files here, both good and bad, so I can try to track any problems with the files it is generating.I want to compile a table showing all of the confirmed working files, and also the ones that are not working, if you have a problem with one not working I may ask you to do further testing when I attempt to modify the file formats.Unfortunately there are no real examples for all of the files from Siglent and so some are based on guesswork and may not be working, this is why I want to nail this down and be sure that there is a known status for each file and calibration type.One interesting point is that all the example cal files are 2,400,000 (or 240,000) count based, but the SDM3045X is a 66,000 count meter, so I am really unsure if the files work for it at all.ModelModeResultSDM3065XDCVWorksSDM3065XDCV Auto ZeroWorksSDM3065XACV-SDM3065XACV 3Hz Filter-SDM3065XDCIWorksSDM3065XDCI Auto ZeroWorksSDM3065XACI-SDM3065XACI 3Hz Filter-SDM3065X2 Wire R-SDM3065X2 Wire R Auto Zero-SDM3065X4 Wire R-SDM3065X4 Wire R Auto Zero-SDM3065XCapacitance-ModelModeResultSDM3055DCV-SDM3055ACV-SDM3055DCI-SDM3055ACI-SDM30552 Wire R-SDM30554 Wire R-SDM3055Capacitance-ModelModeResultSDM3045XDCVWorksSDM3045XACV-SDM3045XDCI-SDM3045XACI-SDM3045X2 Wire RErrror in recalibrated mode or rangeSDM3045X4 Wire RErrror in recalibrated mode or rangeSDM3045XCapacitance-

author: TheDefpom
author_rank: Frequent Contributor
timestamp: March 15, 2023, 11:20:03 pm
content: Anybody?
Possible fluke 23 upgrade????? Mod??? - Page 1
Forum section: electronics / testgear

author: GreyPatch
author_rank: Contributor
timestamp: March 16, 2023, 08:57:51 am
content: So I'm toying with the idea of modifying my fluke23 to add a backlight. I'm afraid that my fluke would need a backpack to house the electronics. So many things to considerHas anyone here gone down the rabbit hole?I'll post some picture asap

author: coromonadalix
author_rank: Super Contributor
timestamp: March 16, 2023, 10:12:15 am
content: Be the first ?

author: daisizhou
author_rank: Super Contributor
timestamp: March 16, 2023, 10:33:51 am
content: Will adding backlight function increase battery consumption?

author: coromonadalix
author_rank: Super Contributor
timestamp: March 16, 2023, 07:48:14 pm
content: for sure ........ if not, backlight will be fed by whom ?

author: Black Phoenix
author_rank: Super Contributor
timestamp: March 17, 2023, 12:55:38 am
content: Quote from: coromonadalix on March 16, 2023, 07:48:14 pmHopes and wishes? Sorry I could not resist because that question before was obvious...
Wavesurfer 424 hack? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: October 22, 2020, 10:48:30 am
content: Is it possible to up-hack these to a 454?David

author: darkstar49
author_rank: Frequent Contributor
timestamp: October 27, 2020, 10:04:43 pm
content: been around for a while, but in all the years, I've not seen a single successful bandwidth hack on a LeCroy scope...(but on anything else than the WS3K, h/w changes would be required)

author: porker1972
author_rank: Contributor
timestamp: October 28, 2020, 10:20:26 am
content: I think the acquisition board on these are bandwidth dependent and not software upgrades. They had to be returned to the LeCroy service centre for almost everything. We noticed it really slowed down with some features enabled and were told the PC memory (I think it was only 128MB as standard) needed an upgrade, but it was an absolute bitch to perform: loads of other boards in the way of the PC motherboard, each one with a different hex spinner or Torx, almost as if it was designed to frustrate.I did read (possible on here though it was a very long time ago) that someone hacked the licence generator and unlocked features. But it must be 15 years old now ad for £500 you can get a scope that does way more and is a lot faster.

author: smaultre
author_rank: Regular Contributor
timestamp: November 03, 2020, 01:33:48 pm
content: Please make a pictures with installed options, serial number, with scopeID i will try to help you.

author: aqibi2000
author_rank: Regular Contributor
timestamp: July 22, 2021, 05:34:27 pm
content: Hi, can you still help with this, I have a 434

author: smaultre
author_rank: Regular Contributor
timestamp: August 06, 2021, 01:07:12 am
content: pm me .

author: sprit
author_rank: Regular Contributor
timestamp: March 15, 2023, 11:19:34 am
content: ]Sorry but anybody have seen that problem? I have ws 424 but when scope start, its say "problem reading probe data on chanel 2,3,4 and... 5? Where is chanel 5 on my scope? I though that it ha e only 4 chanel. Sorry my English is not good. Hopefully somebody can help me with. Thanks a lot.
Tektronix MDO34 Question - Page 1
Forum section: electronics / testgear

author: jayalt
author_rank: Contributor
timestamp: March 14, 2023, 08:25:16 pm
content: Trying to understand this difference I am seeing on my oscilloscope.I am debugging a marginal issue. I see a brighter-colored section at the beginning of power-on of my voltage rail via my oscilloscope. This is significant to me because it ONLY exists when the device goes on to later fail. I have attached the "passed" instance in comparison, where the voltage rail is duller in color.I'm trying to understand what the difference is that is resulting in this different/brighter color? This could potentially lead me to narrow down the root cause of my issue.When I try to zoom in, the waveforms begin to look exactly the same. But there is a clear difference when zoomed out.