hybridfree/eevblog-posts huggingface dataset:
Are the Hantek differential probes any good? Such as HT8100? - Page 1
Forum section: electronics / testgear

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: August 18, 2024, 10:40:25 pm
content: Hello,Recently, Dave reviewed the new Micsig differential probe. I couldn't help but notice that Hantek also offers differential probes, the HT8100/HT8050, for sale at much more reasonable prices. Not that they easily compare, but here's a crude table:MicsigHantekDC:>-80dBDC:≥80dB100kHz:>-60dB100Hz:≥60dB10MHz:>-30dB1MHz:≥50dBI can't seem to find any reviews of the Hantek probes. Does anyone know if the Hantek differential probes are any good with respect to other, more expensive, differential probes, like the new Micsig series?Thanks!

author: Proxy64
author_rank: Regular Contributor
timestamp: October 22, 2024, 01:28:42 pm
content: I also spotted this probe, I'm looking for reviews about it too.

author: RogerG
author_rank: Regular Contributor
timestamp: October 23, 2024, 07:30:52 am
content: Quote from: Proxy64 on October 22, 2024, 01:28:42 pm+1

author: Njk
author_rank: Frequent Contributor
timestamp: October 23, 2024, 01:32:37 pm
content: According to one review on aliexpress, HT8100 uses MAX436 and OPA698 chips

author: Proxy64
author_rank: Regular Contributor
timestamp: November 14, 2024, 12:13:32 pm
content: An alternative Micsig DP10007, should be enough for smps repair.https://www.micsig.com/Differential%20Probe04/

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: December 31, 2024, 02:17:47 am
content: As a follow up, I went ahead and purchased an HT8100. I also purchased a Migsig MDP3001 later. I suspect that my oscilloscope's font end is a bit too loud to get a real idea of the CMRR of the probes, but if you look at the pictures I posted here:https://www.eevblog.com/forum/testgear/cmrr-measurement-am-i-doing-it-right/msg5635599/You'll see that the HT8100 has a few spurs.

author: rvalente
author_rank: Frequent Contributor
timestamp: June 07, 2025, 07:45:09 pm
content: Hello Mates,opinions on HT8050 HT8100 probes? Its on sale for Brazilian customers on Ali 41% the price of the Micsig DP10130, should I get one?
Software for Lighting Passport spectrometer - Page 1
Forum section: electronics / testgear

author: jbb
author_rank: Super Contributor
timestamp: June 11, 2024, 04:14:54 am
content: Hi allMy mother in law has asked for help with some lighting measurements using the Asense Tek Lighting Passport spectrometer.It’s a few years old and meant to connect to a phone using the Spectrum Genius app. But said app is no longer in the Apple App Store.Does anyone know of an alternative app? Or if the app is available for Android or something? Otherwise this nice little instrument is now a brick :-(

author: TomKatt
author_rank: Frequent Contributor
timestamp: June 11, 2024, 10:20:18 am
content: I've been burned on platform specific app based hardware myself. It's ridiculous that there's no way to obtain IOS apps that no longer exist in the App Store - even if you could find a phone with the correct hardware for an earlier IOS version. Android has it's own issues, but at least you can occasionally find an apk file to sideload. But odds are if the company is gone and you cannot locate the app then yes, it's now a brick.Speaking of which, looking up to see what this device is I did encounter a few notes claiming the developer was working on an Android version at one point - not sure if they are still in business, but I'd try to contact them or any of the suppliers.

author: Tjuurko
author_rank: Regular Contributor
timestamp: June 11, 2024, 12:47:18 pm
content: I found something similar for Android:https://play.google.com/store/apps/details?id=com.asensetek.sge.plus.androidSpectrum Genius Essence Plushttps://play.google.com/store/apps/details?id=com.asensetek.sgm.plus.androidSpectrum Genius Mobile Plus

author: _Wim_
author_rank: Super Contributor
timestamp: June 12, 2024, 08:43:33 pm
content: Here you can download the pc software for it:https://www.ledclusive.de/en/led-spectrophotometer/

author: ArdWar
author_rank: Frequent Contributor
timestamp: June 13, 2024, 10:42:06 am
content: Quote from: Tjuurko on June 11, 2024, 12:47:18 pmQuoteGood grief, as if the app suddenly disappearing isn't completely jeopardizing long term usage already...

author: jbb
author_rank: Super Contributor
timestamp: December 02, 2024, 11:26:49 pm
content: Thanks for the help, people.We got a second hand Android phone and tried ‘Spectrum Genius Mobile Plus’ and ‘Spectrum Genius Essence Plus’ apps, but were thwarted by not being able to register the device. It would just sit there spinning for ages, and eventually show ‘IO Error.’ Presumably because the cloud server is gone.

author: igmaval
author_rank: Newbie
timestamp: June 05, 2025, 10:17:39 am
content: Does anyone finally get something? I have the original CD if anyone need it but I am looking for mobile version

author: igmaval
author_rank: Newbie
timestamp: June 07, 2025, 07:37:22 pm
content: https://apps.apple.com/us/app/spectrum-genius-mobile/id674989500this is the link to download it from apple store but it is not working in Spain, does anyone could check in his country ?
DMM mV dropping when idle - Page 1
Forum section: electronics / testgear

author: geralds
author_rank: Contributor
timestamp: June 07, 2025, 03:05:27 pm
content: Hi, pls exucse my ignorance, I am a beginner trying to learn...I noticed that when my DMM (ZT-225) is set to mV (DC) and is not measuring it displays a continues drop in mV (e.g. after 1 minute it displays a bit more than -20mV, and this continues gradually (seems at the same rate) until "OL").Is this a fault or correct behaviour?If it is a fault, am I doing sth wrong? Can I fix it? Or should I (try to) return it?If it is correct behaviour, can someone explain it to me? E.g. is this actually showing/reflecting the batteries discharging?Many thanks!

author: Aldo22
author_rank: Super Contributor
timestamp: June 07, 2025, 03:19:43 pm
content: Are the two outputs/test leads connected?If not it will show anything because it is sensitive in the mV range.If you connect/short-circuit them, it should show 00.000, otherwise something is wrong.

author: Fungus
author_rank: Super Contributor
timestamp: June 07, 2025, 03:33:06 pm
content: It's correct behavior.We're surrounded by radio waves. It probably changes on where the meter is, if the probes are inserted, if the probes are on the table, where you are relative to it.

author: geralds
author_rank: Contributor
timestamp: June 07, 2025, 03:36:16 pm
content: Thank you both (Aldo and Fungus).Behaviour is the same with and without test leads inserted. And if test leads are attached to each other the display shows "00.000" indeed.Out of curiosity, what is the reason for this?

author: Aldo22
author_rank: Super Contributor
timestamp: June 07, 2025, 04:05:43 pm
content: Quote from: geralds on June 07, 2025, 03:36:16 pmThis is simply normal when the inputs float.It can have various causes.Just consider this case as “undefined behavior” and ignore it.See:https://www.eevblog.com/forum/beginners/multimeter-doesn_t-zero/

author: HKJ
author_rank: Super Contributor
timestamp: June 07, 2025, 04:08:16 pm
content: The meter has a very high input impedance in the mV range (Probably in Gohm range) and a small internal leak current is charging the input capacitance up. Most, if not all, meters with very high input impedance does this.

author: HKJ
author_rank: Super Contributor
timestamp: June 07, 2025, 06:57:08 pm
content: Quote from: HKJ on June 07, 2025, 04:08:16 pmJust a comment more on this:Most multimeter chips has a native input range in the mV, like 500mV and maybe a 50mV too. For all volt ranges a input divider is used and that is usually around 10Mohm. It is not exactly 10Mohm, it is a 10Mohm resistor in series with the input and then some other resistor to 0V. For mV the resistor to 0V is disconnected and the input impedance is only limited by the input impedance of the chip.Some meters do add a extra resistor to keep the input resistance around 10Mohm when in mV.I have written a bit about multimeter design here:https://lygte-info.dk/info/DMMDesign%20UK.html
Agilent E7495B Options - Page 1
Forum section: electronics / testgear

author: maurit
author_rank: Contributor
timestamp: June 07, 2025, 10:23:31 am
content: Hello,I was given an E7495B in very bad cosmetic condition, with several dents and a broken LCD.After a lot of "bodywork" and replacing the LCD with the NL6448BC33-53,I successfully updated the firmware to version 06.25 (thanks Wallace).Now the problem of Options remains.I think I understand the method, but I don't have the necessary knowledge and unfortunately I can't even get started.All advice is welcome,especially the trivial and obvious ones.Many thanks.Mauriziomaurinot AT libero DOT it
HP 8711C Firmware - Page 1
Forum section: electronics / testgear

author: wolfg
author_rank: Newbie
timestamp: April 16, 2024, 11:40:37 am
content: While trying to archive, I accidentally damaged the firmware flash (AM28F020) of my Hp8711C.Its bricked now, I would be grateful for a working copy to revive....

author: sarnau
author_rank: Contributor
timestamp: May 24, 2025, 11:02:47 pm
content: I've reverse engineered part of the firmware and put everything on Github, this includes the bootROM, that said: you should modify the serial number and MAC address to keep it clean.https://github.com/sarnau/HP-8711C-RF-Network-Analyzer

author: sarnau
author_rank: Contributor
timestamp: May 24, 2025, 11:04:29 pm
content: Oh, forgot to mention: I've also reverse engineered the way the option keyword is generated, so you can enabled IBASIC, LAN and Fault/SRL right from the UI without opening the device.If you are really brave, you can reset the serial number that way as well. Or even convert it into an 8730A – I have so far tried neither of these.

author: sarnau
author_rank: Contributor
timestamp: June 06, 2025, 09:31:37 pm
content: I found a way to convert a 8711C to a 8712C (or a 8713C to a 8714C) without even opening the unit. It abuses the LAN Firmware update feature in the BootROM and I created a 64 byte patch, which is uploaded to RAM, it reads the OC (option code), enables all the features and calls the internal BootROM debugger to write the licenses back out. It now only takes a few seconds.A complete write-up is part of the GitHub Repo:https://github.com/sarnau/HP-8711C-RF-Network-Analyzer
JunTek JDS2800 External input problem - Page 1
Forum section: electronics / testgear

author: jdev99
author_rank: Regular Contributor
timestamp: June 05, 2025, 06:53:36 pm
content: I recently bought one of these signal generators (just about the same as the JDS6600, just a different form factor)It have an input for an external signal to measure frequency or counting, which seems straight forward to use, but on mine I can not get any measurements. Either I use it wrong or there is a problem with it.According to a YT video from them, (https://youtu.be/mh5ggtBoOaE?si=SzfhrxhELEOkLHqn&t=546) you can configure a waveform on CH1 for example, and simply connect it to the Ext.IN connector, and then should see the frequency or the count.When I do this, or connect it to another external signal generator, I don't see any measurements.Are there a specific method you must use to use this input, or is it possible that it is faulty?I can ask for a refund and simply return it, but I got it for a REALLY good price , they advertised it at the wrong price (£10.90 instead of £109.00) and I will not get another one at that price.https://www.junteks.com/pages/goodDetail/index?type=0&model=JDS2800Thank you for any assistance.
Hioki 3288-20 Clamp Meter - Crest Factor - Page 1
Forum section: electronics / testgear

author: 2X
author_rank: Frequent Contributor
timestamp: June 04, 2025, 11:21:20 pm
content: Hi, I want to buy the Hioki 3288-20 Clamp Meter. On the user manual writes that 3288 don't have Crest Factor and the 3288-20 has Crest Factor. As I know the value of the Crest Factor it shows the content of the energy in high frequencies (greater Crest Factor and greater the energy content in high frequencies).1. I didn't find on the manual or in a video/picture where the Crest Factor is displayed on the clamp meter's screen. If it is not displayed what is purpose of it?2. I can't understand what means with 3max crest factor at 1000A range is 2max and on voltage renge is 2max, the 3 max where it comes from?• 3288-20: 3 max.Current range: 1000 A range is 2 max.,Voltage range: 1.5 max.Hioki 3288-20https://www.hioki.com/global/products/clamp-meters/ac-dc-clamp/id_6049User Manual:https://www.hioki.com/global/download/30530Crest Factor considerations when measuring AC signals with a Bench Multimeter

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: June 04, 2025, 11:34:14 pm
content: https://en.wikipedia.org/wiki/Crest_factor

author: Kean
author_rank: Unknown
timestamp: June 05, 2025, 04:11:04 am
content: It certainly is not clear, but maybe the "3 max" crest factor specification is for the 100A AC current range.

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: June 05, 2025, 04:26:56 am
content: it means that in best conditions for meter it can include "3:1" into indicated value (and it is not bad/also not special but not bad) - consider one decimal point only indicationwill not be good for small currents from my experience with such meters.if he is not to measure some quadrupole modulated AC or something that meter should compute the result correctlyif he will have to measure AC voltages with such level of "wonderful" harmonics two things:- there is something really broken- he needs something much more expensiveoverall this is not bad meter by any meanshe also did not said what he needs it for - just to have good clamp meter or some pro jobs

author: 2X
author_rank: Frequent Contributor
timestamp: June 05, 2025, 05:22:44 pm
content: Quote from: kmoonwalker on June 05, 2025, 04:26:56 amI just want a good meter and slim in size.Thanks for your reply.
Fnirsi DST-210  - Page 1
Forum section: electronics / testgear

author: downwind27
author_rank: Newbie
timestamp: June 09, 2025, 04:42:16 pm
content: I somewhat rashly bought one of these jobs, thought it could be quite useful to carry around in the toolbag. Must confess that I am completely lost in trying to set up the oscilloscope. Does anyone know of a set of user instructions which make sense? A flowchart showing what button does what (and when) would be most useful. Also I notice that the off button sometimes just initiates a restart, no mention of this in what they laughingly describe as the user manual.D27
Tonghua LCR list mode - Page 1
Forum section: electronics / testgear

author: chilternview
author_rank: Frequent Contributor
timestamp: April 28, 2025, 08:15:37 am
content: Anyone using a Tonghua LCR meter in LIST:FREQ mode?According to the docs, the cmd should be able to take up to 201 frequency points for a list sweep. But I've found in practice it is limited to lower than that; the limit seems to be set by the length of the cmd. With each point being a string e.g. '1.0e+03', that's 8 chars per point plus 10 for the initial 'LIST_FREQ '. The maximum number of points I can specify is about 125 - so at a guess the cmd buffer is limited to 1024 chars. Any more and you get an error 'No values in sweep list' and no list values are set.Of course you can avoid using list mode and just set a frequency, measure it then step to the next frequency, but this is a fair bit slower than using list mode.

author: chilternview
author_rank: Frequent Contributor
timestamp: June 05, 2025, 12:58:58 pm
content: I've had a series of communications with Tonghua sales ('Rita' of Changzhou Chungkai Electronics Co Ltd).Alas they don't seem inclined to fix this bug. All they could suggest was to specify a frequency, make the measurement, then increment the frequency.So forget using list mode, it doesn't do what its specified to do.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 05, 2025, 01:11:20 pm
content: Which meter and firmware version are you using?

author: chilternview
author_rank: Frequent Contributor
timestamp: June 05, 2025, 01:28:08 pm
content: Mine's a TH2827C. IDN? gives Version 1.0.1 , Hardware version C9.0I'd be interested to know if the problem exists on other models, or whether they even have this list mode. The documentation states that the list mode has a maximum of 201 points, which would be plenty, but the input buffer limit of 1k characters means that in practise you're limited to around half that number under program control.Shame that they don't want to fix it as otherwise it's an excellent meter and compares favourably with a Keysight E4980A which costs many times the price of the Tonghui.

author: KungFuJosh
author_rank: Super Contributor
timestamp: June 05, 2025, 01:34:01 pm
content: Tonghui makes great hardware, but their support is terrible. Worse than Keysight support for sure.Sourcetronic sells their branded version of it, the ST2827C. You could contact them and see if they have a newer firmware.Tonghui version numbers can be weird though. On the ST283X series, the version is always 1.0, and only the date changes. You can see the date on startup.Thanks,Josh
Help with channel display on r&s rtb oscilloscope  - Page 1
Forum section: electronics / testgear

author: salomonander
author_rank: Regular Contributor
timestamp: June 03, 2025, 01:42:52 pm
content: I feel ridiculous for opening this thread. I should just study the manual. But i did for ages and my darn adhd makes it impossible. Maybe someone is kind enough to help me out?Please explain to me, how i can have two different zones on the display for ch1 and ch2. Right now they share the same grid, but i want them to be displayed on top of each other. I just cant find out how to do thatthanks!

author: egonotto
author_rank: Super Contributor
timestamp: June 03, 2025, 02:17:23 pm
content: Hello,I'm afraid that's not possible.Only in the special case of XY display can you see different channels in different windows.Best regardsegonotto

author: salomonander
author_rank: Regular Contributor
timestamp: June 03, 2025, 02:24:29 pm
content: Now that explains it allthanks mate!One more noob rtb/oscilloscope question if you dont mind:Is there any way to automate the horizontal scaling so that when changing frequency on my generator i dont have to re-scale in order to keep track of my waveform?I think its called auto-scaling.Im triggering external off an official trigger output from the generator.Thanks

author: egonotto
author_rank: Super Contributor
timestamp: June 03, 2025, 03:13:14 pm
content: Hello,that probably won't work either.You can try whether the SCPI commandDEVice:MODE AUToset is helpful.You would then have to send it to the RTB again and again.If that doesn't work, you could try measuring the frequency with an SCPI command and then forcing the desired horizontal setting with an SCPI command.Best regardsegonotto
Agilent/Keysight AWG 33500 33600/33522B dual output appl ? - Page 1
Forum section: electronics / testgear

author: jonpaul
author_rank: Super Contributor
timestamp: June 02, 2025, 08:39:21 am
content: Bonjour a tous:I have an unusual app for the Keysight/Agilent/HP dual output arbitrary function/wave generators, to create alternating tone bursts:https://www.keysight.com/us/en/assets/7018-05928/data-sheets/5992-2572.pdfCH A and B both output same sine tone burstAlternate bursts CH A><CH B with 180 deg phase diff,Tone burst on CH A then CH B etc.anyone experienced similar use on these?Also looking to buy one (besides Epay)Mille Mercis,Have an absolutely fantastic day !Jon

author: Someone
author_rank: Super Contributor
timestamp: June 02, 2025, 12:35:12 pm
content: If you draw a (annotated) waveform of what you want i can try it for you. First guess would be to phase lock the two outputs 180 degrees and then mod them both 180 with the gate input? Not sure about alternating tones.

author: jonpaul
author_rank: Super Contributor
timestamp: June 02, 2025, 03:37:24 pm
content: Hi its easy to imagine:CHABURST_________________BURST________________CH B__________BURST__________________BURST_____The dead time has both channels offJon

author: nctnico
author_rank: Super Contributor
timestamp: June 02, 2025, 04:06:48 pm
content: This is doable using sequencing (typically an option you have to buy seperately). Also take a look at Tektronix' AFG31000 series. These have a much bigger screen so they are easier to control / setup without needing external software (to the point you don't really need the remote control software to make full use of the AFG31000).

author: Someone
author_rank: Super Contributor
timestamp: June 02, 2025, 11:33:30 pm
content: Quote from: jonpaul on June 02, 2025, 03:37:24 pmNot sure this can be done with the models you mention as even with sequence mode (which can make the 4 steps) there is no explicit sync between the channels.Diagram was important as it was unclear in the opening post if you wanted two different configurations, or a single setup combining both characteristics.
HTS001 IC Tester - Page 1
Forum section: electronics / testgear

author: k-krzych
author_rank: Newbie
timestamp: June 02, 2025, 07:51:41 pm
content: Hello everyone,I can see this HTS001 IC tester all over the place for some time. Considering the price this ahould be pretty agile tester. I was looking for any review or overvie but the effort was futile.Has anyone have hands on one of those, and is willing to share some opinions please?www.alibaba.com/product-detail/HTS001-IC-Tester-Transistor-Tester-IC_1600124289980.htm
[Solved] Are here any owners of BEHA/Metrel safety testers? Need scheme of  - Page 1
Forum section: electronics / testgear

author: Uunoctium
author_rank: Frequent Contributor
timestamp: June 02, 2025, 10:33:47 am
content: Got an discontinued Beha 9050D for near nothing at flea market. Unit showed visible signs of its origin - must have laid some time in a scrap container.Exept from one of the two toroids is faulty (primary winding high Z) i can't neither use 3/4 of the testmodes nor checking them for further faults. Unit calls for connecting "Commander I or II".Connection of is an proprietary multipin connector. I argue 4 of them are building pairs of Kelvin-tips and the other smaller 4 are signal pins. 1 & 2 are Gnd and +12V; the other two unknown. Detecting the presence of probe itself, signalling to three Led's and decoding 3 pushbuttons. No signal traffic at initial powerup or switching between the modes. So i guess no I²C...Can anyone help me with teardown images or an schematic?Thanks!p.S. Metrel is mentioned, cause they are the OEM manufacturer. PCB's are marked "Metrel"Addendum/Edit:have now solved the problem by giving the instrument to the recycling yard
Tektronix Y400 Net-Tek Analyzer - Page 1
Forum section: electronics / testgear

author: Fiji1221
author_rank: Newbie
timestamp: June 01, 2025, 05:04:56 pm
content: Hello there! Reaching out to see if i can get some help.I have a Y400 Net tek analyzer, that is the Y400 (b012011) chassis with the YBT250 (B043879) and the YBA250 (B012089) and i am looking to get the options opened, or the RF scout enabled.Anyone have any ideas? i contacted tek, and since its obsolete - they have no way to assist me.
Maplin "Precison Gold"  M205 Sweep Function Generator - Service Manual wanted - Page 1
Forum section: electronics / testgear

author: jdev99
author_rank: Regular Contributor
timestamp: May 31, 2025, 06:23:03 pm
content: Do anybody know where I can find a service manual for this model.Bought it on eBay recently, nothing special, would like to "service" it.Thank you for any assistance.Joe.
HP5245M Crystal Oven Hack - Page 1
Forum section: electronics / testgear

author: MaicoDoug
author_rank: Newbie
timestamp: May 30, 2025, 01:11:07 pm
content: Hello everyone, been reading for a very long while this blog & I can say that it's about time that I should finally say something......I have an old piece of very special test equipment. A HP5245M with a totally burnt up crystal oven. The internal everything is toast. Been reading all about the "105" stand alone assembly. This "00105-6012" Ser 378 is a version that is different as the chassis is a "M" suffix. I want to seriously consider a modification. There are some interface considerations besides the 1 volt/5 Mhz oscillator signal that could be restored with a very simple circuit, unlike what HP deployed with multiple frequencies emitting as a second function from the 105 oscillator. The overall function works as a decent period counter, was working 100% correctly during the first 10 minutes until the frequency counter all of the sudden quit working. Some other period functions quit also. So currently I'm considering using the existing 5Mhz crystal / oven assembly and install my own Colpitts circuit. Establish the 1 volt / 5 Mhz signal, and get it back & going again at that point investigating exactly what signals need to go where to re-establish the frequency operation, which becomes locked out when the oven fails to be valid operation. Also the use of an input frequency source does somehow enable some period functions, but on the rear panel does have an external 1 Mhz standard oscillator input I may try.Currently all the DC supplies look ok, however I may go ahead & re-cap those cans from underneath. Got some dirt work to get done in the next few days, so I'll say thanks to any of you that reply with comments & opinions. - Doug.

author: factory
author_rank: Super Contributor
timestamp: May 30, 2025, 09:30:49 pm
content: It's the same oven used in the older 105A/105B & a few others, higher spec than the standard oven, eventually they replaced it with the 10544 or 10811 ovens in the 105A/B and 5245 counter.Attached is the circuit part for the 5245L with 10544 (part of the 5245L manual changes I scanned, available here when the website is available;https://www.ko4bb.com/getsimple/index.php?id=manuals&dir=HP_Agilent_Keysight/HP_5245Lyes I should have scanned it at lower res..)Some people have also rewired the 105 series oven assembly. It's also recommended to remove the 115V ac heater wiring & disable the fast warm up heater, short circuit failure of this part causes a lot of damage.David
HR1520 Short Killer: Voltage spikes during short circuit recovery - Page 1
Forum section: electronics / testgear

author: TechnikCR
author_rank: Newbie
timestamp: May 29, 2025, 08:23:35 pm
content: Hi,I recently purchased one of these Short Killer units and discovered that it produces significant voltage spikes when recovering from a short.The voltage spikes seem to occur primarily when the output is set to lower levels around 1.6V, which is typically the range I use when tracking shorts on PCBs. The concern is that if a faulty component burns out or loses connection during the voltage injection, the sudden removal of the short causes a dangerous voltage spike to reach the rest of the circuit. In my case, the output surged from 1.6V to 5.6V, as shown in the attached scope trace.The higher the voltage setting, the less fluctuation there seems to be. However, as I mentioned, I typically wouldn’t use higher voltages when diagnosing a shorted component on a PCB, which makes this unit practically unusable for my needs. I’m curious if others have had a similar experience or if my unit might be defective.
is Rigol DM3051 any good? - Page 1
Forum section: electronics / testgear

author: octal
author_rank: Contributor
timestamp: June 01, 2025, 03:33:21 pm
content: Hello,I can't find any information or review about the Rigol DM3051. Is it a dead product? is it any good? (I can find it at nice prices as second hand)

author: coromonadalix
author_rank: Super Contributor
timestamp: June 01, 2025, 04:41:59 pm
content: maybe a lack of popularityhttps://www.eevblog.com/forum/reviews/rigol-dm3051-5-34-digit-multimeter/

author: octal
author_rank: Contributor
timestamp: June 01, 2025, 07:03:45 pm
content: In fact this was the only link to this multimeter. On Youtube there is none.I don't understand why. It's strange

author: 2N3055
author_rank: Super Contributor
timestamp: June 01, 2025, 08:38:19 pm
content: It is older discontinued model.

author: Martin72
author_rank: Super Contributor
timestamp: June 01, 2025, 09:01:28 pm
content: It hasn't been available for quite some time, but you can still find a data sheet, instructions, and (less useful)customer reviews on the Batronix website.https://www.batronix.com/shop/multimeter/multimeter-dm3051.html

author: electr_peter
author_rank: Unknown
timestamp: June 02, 2025, 02:46:01 pm
content: Check this video review of DM3068 (very similar to DM3051)TSP #12 - Rigol DM3068 6.5 Digit Digital Multimeter Review

author: 2N3055
author_rank: Super Contributor
timestamp: June 02, 2025, 03:21:05 pm
content: Quote from: electr_peter on June 02, 2025, 02:46:01 pmNot even close..DM3051 is older version similar to DM3058E, a 5¾ digit meter.

author: kmoonwalker
author_rank: Frequent Contributor
timestamp: June 02, 2025, 06:16:29 pm
content: for something like 80-100 euro Ok... but for more consider collecting a bit more some older HP/Agilent/Keithley insteadthere was nothing fancy about it when I used it and I sold it some years ago for like 500 zloty (approx 120 euro back then)
Fluke 8845A turns on during power glitch? - Page 1
Forum section: electronics / testgear

author: ledtester
author_rank: Super Contributor
timestamp: May 24, 2025, 08:50:47 pm
content: I have a Fluke 8845A. I don't use it very much but I do keep it plugged in and in standby mode.On a number of occasions I've come into my lab area and noticed that the Fluke has turned itself on.I've pretty much have tracked it down to a short interruption in the power - that's something that happens like once or twice a year on average. The interruption is very short - like maybe 1/10 of a second or less - perhaps due to strong winds or a squirrel.Some questions:1. Has anyone else seen the same phenonemon and can validate my power glitch theory as to why the Fluke turns itself on?2. Any recommendations for ways of detecting and recording the times of short power glitches?Thanks!

author: AVGresponding
author_rank: Super Contributor
timestamp: May 26, 2025, 09:34:54 am
content: Probably a failing crapacitor in the soft power circuit

author: Bobson
author_rank: Regular Contributor
timestamp: May 31, 2025, 03:46:18 pm
content: 8846A all I've seen turns on after power outage.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 31, 2025, 06:12:35 pm
content: well unless some spike do get carried into the mcu control lines and the logic dmm supplyi do have an old tds 2k scope who change functions on ac spikes lollas written could be some cap failing, reset circuit ? watch dog ...
Agilent/P/Keysight AWG 33250A  /HP33220A  - Page 1
Forum section: electronics / testgear

author: jonpaul
author_rank: Super Contributor
timestamp: May 27, 2025, 09:08:57 am
content: hello everyone Bonjour a tous...This fine 80 MhZ AWG (circa 2016) came in with note "Fails Calibration"It is similar to the 33220A 20 MhZ.Any tips or experience (on either part number) in calibration or troubleshooting are appreciated.Bon SoireeJon
UNI-T UT335A/UT335B/UT335C (gauss meter) - Page 1
Forum section: electronics / testgear

author: nikitasius
author_rank: Regular Contributor
timestamp: April 18, 2025, 07:07:22 am
content: Hi folks!Recently i had some DIY ideas so i decided to buy few N52 magnets from china. We all know that chinese N52 isn't really really real N52 we suppose to have.So i was looking for a way to test them without bleeding a lot. And most easy way was to test it w/ gauss meter.I did some researches, found few posts on eevblog and over the web and they are all (except the real pro ones for hungreds €) are based on same prototype more or less.I checked AliExpress and found out that uni-t did one also.There are 3 models: A/B/C. Difference is in probe & label: 5%/2%/1% precision. I told "hmmm", and took 2% version.I took it in "UNI-T official store"https://s.click.aliexpress.com/e/_EGX97KcHere is the deviceThe menusBtw, all magnets N52 i got on temu (my wife have an acc there) was fake 🤓All photos:https://drive.google.com/drive/folders/1Md8u1kZiB5JdAN_j5XY84ursASlMygjF

author: nikitasius
author_rank: Regular Contributor
timestamp: April 18, 2025, 07:11:32 am
content: The PCB

author: nikitasius
author_rank: Regular Contributor
timestamp: April 18, 2025, 07:17:48 am
content: So.. as i said, all N52 magnets was fake!But maybe the device simply doesn't work? 🤔Well, i tested it 🤓I made a solenoid, i setup the current, i used the formula and.. i got correct values from gauss meter (hand movements & current fluctuations are affect it, sure).So, from my point of view after the tests i did: device is legit and really works, and chinese n52 magnets sucks 😁

author: electr_peter
author_rank: Unknown
timestamp: May 27, 2025, 05:08:23 pm
content: Do you have a detailed english manual for UT335A?
Programmer for X2816BP? - Page 1
Forum section: electronics / testgear

author: W4PJB
author_rank: Regular Contributor
timestamp: May 28, 2025, 07:46:01 pm
content: Can anyone recommend a programmer for the X2816BP EEPROM chip? My head is spinning trying to figure out the array of Chinese clones of the T48/T56 out there and not entirely confident all would work as advertised. If available from a USA supplier, that would be a bonus.I will be using this to flash an EEPROM on my 8753C. Thanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: May 28, 2025, 08:34:14 pm
content: you need to search in their supported device list and or install the 48 56 or 76 software and check if the xicor x2816bp is in themcheck here you have their listhttp://www.xgecu.com/en/Index.htmlt48 t56 TL866II seems to be capable BUT THEY ONLY HAVE THE A B C not a BP ??i know some oldies like chipmaster 6000 uxp i have can do itmaybe some xeltek 5000 and up or even the 3000 can do it ... once again you can install or check their supported devices ...

author: W4PJB
author_rank: Regular Contributor
timestamp: May 28, 2025, 10:11:10 pm
content: Thank you for your reply. Yes that was one of the issues; I cannot seem to find much information on the BP model although other versions of the chip are claimed to be supported. I understand one of the limitations many programmers have is insufficient voltage for writing these older EEPROM’s.I’ve taken a shot on this unit from Amazon. It appears to be the official Xgecu store, so hopefully this is not a clone using inferior hardware as often happens with these types of devices. It claims to support up to 25 V peak to peak, which should be sufficient for writing.https://a.co/d/eFFSjYBI also found some surplus X2816BP chips at an electronic surplus store in Ohio, so I’ve ordered several for testing along with some DIP sockets so I do not have to risk damaging the one in the unit, which does work, but I cannot write to to add options.Everything should be here sometime next week so I will post updates once I get a chance to test.

author: gslick
author_rank: Frequent Contributor
timestamp: May 28, 2025, 11:15:47 pm
content: Quote from: W4PJB on May 28, 2025, 10:11:10 pmThePin X2816BPjust means that it is a 24-Lead Plastic DIP package.Other options areJfor 32-Lead PLCC andDfor 24-Lead Cerdip packages.http://www.bitsavers.org/components/xicor/1990_Xicor_Data_Book.pdfPage 10-10 (Page 619 of the PDF)
N1911A display issues  - Page 1
Forum section: electronics / testgear

author: grendle373
author_rank: Contributor
timestamp: May 27, 2025, 02:46:12 pm
content: Having some issues with a N1911A power meter i was gifted. The unit powers up and responds over gpib, supply voltages look good. The display flashes the splash screen on power up then goes white. I had a replacement display from another unit but it does the same. I re soldered the front panel cable connector and don't see anything obvious. I've seen similiar units have bad fpga's but those usually just wont boot at all. Is there a display driver chip that possibly fails? Anyone had luck with these? All help is appreciated. Thanks!
Hameg SG-7150S - Page 1
Forum section: electronics / testgear

author: andjns
author_rank: Newbie
timestamp: May 27, 2025, 01:52:51 am
content: Hi, I'm looking for any documentation on Hameg SG-7150S (FM-AM Signal Generator). Preferably a service manual, if not, then user manual. Couldn't find any info. Thanks.
Options for tracking generator. - Page 1
Forum section: electronics / testgear

author: Radioman260
author_rank: Contributor
timestamp: May 23, 2025, 09:00:12 pm
content: I am attempting to setup a GPIB interface with my R&S CRTU. I have keysight talking to the CRTU, but when I use freres64 I get an error.Here is a video of where I'm stuck.https://youtu.be/w3fcOPv2n00?si=1WpM-HF0jxzckkFhSo my thoughts is that it's an issue with freres64 communicating with the CRTU? I did request an evaluation key to try VMA but I have not heard back from the developer.Is there any other programs I can try?

author: Radioman260
author_rank: Contributor
timestamp: May 26, 2025, 05:14:25 pm
content: So far what I've determined is that MAYBE freres64 does not work with a CRTU? Unless someone can come forward and compare notes with me. I was able to get an evaluation key to try VMA from Victor and VMA works just fine with the CRTU.Can anyone confirm if they are using Freres64 with the CRTU? I'd like to compare notes.https://youtu.be/ik6qBaZtudc

author: Kean
author_rank: Unknown
timestamp: May 26, 2025, 05:49:56 pm
content: I don't know much of anything about this as I don't have a CMU/CRTU, but I do recall reading up on them some time ago.You might want to try posting your question in this thread:https://www.eevblog.com/forum/testgear/rohde-schwarz-cmu200/The last three or so pages in particular are discussing CRTU, freres64, etc.
Fluke 743B Calibrator - Page 1
Forum section: electronics / testgear

author: Taimer81
author_rank: Regular Contributor
timestamp: May 24, 2025, 01:06:09 pm
content: Hello everyone.Does anyone have any experience with calibrating the Fluke 743B instrument? Does it have an internal calibration function, or is it not available to the user for calibration?Thank you.

author: BillyO
author_rank: Super Contributor
timestamp: May 26, 2025, 03:17:25 pm
content: Read all about it:https://assets.fluke.com/manuals/74x_____cmeng0200.pdf
Digital oscilloscope model RSDS 1102cml+ hang "armed" - Page 1
Forum section: electronics / testgear

author: anuar
author_rank: Newbie
timestamp: May 16, 2025, 02:50:21 am
content: Hi Expert,is there anybody experience on digital oscilloscope model RSDS 1102CML+ ?.My digital oscilloscope model RSDS 1102CML+ having hang due to "Armed". I am try to switch off and on a few time but still having hang due to "Armed". please find out the picture as per attachment file.Does anyone know how to diactivate "Armed" ?. with this condition any button not activate.So please help me.Tq.

author: KungFuJosh
author_rank: Super Contributor
timestamp: May 16, 2025, 02:56:03 am
content: Check yourtriggersettings, time base, etc.You can read the Siglent manual if you can't find an RS manual. That's rebranded for RS.

author: tautech
author_rank: Super Contributor
timestamp: May 16, 2025, 03:24:27 am
content: Default the scope.That should clear any trigger settings and return it Auto triggering mode.Then consider updating the firmware:https://int.siglent.com/download/firmwares/?ProId=40

author: anuar
author_rank: Newbie
timestamp: May 16, 2025, 03:42:56 am
content: Dear All,I am try to push any button but no action. Even i already push button "Auto trigger" also no action.

author: tautech
author_rank: Super Contributor
timestamp: May 16, 2025, 03:53:36 am
content: Quote from: anuar on May 16, 2025, 03:42:56 amTry pressing Math at boot:https://siglentna.com/operating-tip/oscilloscope-hardware-reset/

author: anuar
author_rank: Newbie
timestamp: May 20, 2025, 03:54:07 am
content: Hi all,I already press button "Math" during boot up but my oscilloscope still hang with " Armed".Anybody please please :'( :'(

author: coromonadalix
author_rank: Super Contributor
timestamp: May 20, 2025, 04:05:16 am
content: pressingMathbefore booting and hold it ... normally a Siglent will or may beep and reboot with everything resetted to defaultsor push it multiples times at 1 second interval ...OR maybe this thread can be of some helphttps://www.eevblog.com/forum/testgear/help-restore-sds1000cml-after-unsuccessful-flashing/

author: tautech
author_rank: Super Contributor
timestamp: May 20, 2025, 04:26:48 am
content: Quote from: anuar on May 20, 2025, 03:54:07 amContact Siglent HQ and point them to this thread.support@siglent.com

author: anuar
author_rank: Newbie
timestamp: May 26, 2025, 07:24:51 am
content: hi expert,for your info my Oscilloscope back to normal after download recovery file given by OEM expert.Thank you so much for your opinion and suggestion
Brymen 257s calibration data - need eeprom - Page 1
Forum section: electronics / testgear

author: Helix70
author_rank: Unknown
timestamp: May 25, 2025, 12:25:49 am
content: Hi Guys,I have a Brymen 257s that has been incorrectly calibrated. It is not even close. I don't have access to calibration equipment, so before this meter gets junked, I thought I might try and ask if someone has the contents of the 24LC02A eeprom from a good unit that i can start from. I know, it won't be as good as getting it calibrated, but i just want something close enough for this currently useless meter.Thanks, Josh
Keysight MXG B signal generator license file - Page 1
Forum section: electronics / testgear

author: Dovott
author_rank: Newbie
timestamp: May 24, 2025, 09:17:33 am
content: Hello.I want to activate options on my Keysight MXG signal generator.For this I need real license file from any Keysight MXG NxxxB series generator to understand what key generation algorithm is used there.Can someone share such license file?
Micsig TO3004/ATO3004 High-Res mode? Rigol DHO800/900 powering? - Page 1
Forum section: electronics / testgear

author: msnremea
author_rank: Contributor
timestamp: May 26, 2025, 11:26:05 am
content: I currently own a Rigol MSO5000 and I consider replacing it with a more mobile device.I thought about the Rigol DHO924S, which I understand can be powered from a power bank. Does anyone tried that already? Rigol says input voltage 15V but my Power banks are all 5V. I guess the DHO900 won't have a step-up converter, will it?I also thought about the Micsig TO3004 which seems to be a nice package but it's only 8 bit and I can't see anything about a high-resolution sampling/acquisition in manual or data sheet. Does anyone of happen to know if that's available with this device?(btw, if someone is happily using anoter "mobile" scope I'll be happy to hear what it is)

author: Grandchuck
author_rank: Super Contributor
timestamp: May 26, 2025, 11:35:31 am
content: https://www.eevblog.com/forum/testgear/dho914-battery/msg5685611/#msg5685611
Fluke 5205A Timer Question - Page 1
Forum section: electronics / testgear

author: ScottA
author_rank: Newbie
timestamp: May 15, 2017, 04:13:33 pm
content: Just purchased a Fluke 5205A in very good shape but I have a question about what looks like a fuse holder that is labeled "Timer" on the back of the unit. Mine has nothing in it and I have not been able to find any information about it or even a picture of it in any manuals I have found. I have seen this same feature on a couple of Fluke 5205A's I have seen for sale but most don't seem to have it so my guess is that it was a late addition to the latter Fluke 5205A's made. Just want to know what its purpose is and what the replacement part is?Thanks for any information you may have on this,ScottA

author: Robert Falls
author_rank: Newbie
timestamp: November 29, 2021, 06:55:33 am
content: Fluke part #682161 fits in and is a "fuse" like indicator. The indicator is a 5000 hour device. The attachment is of a similar device.

author: pac1085
author_rank: Regular Contributor
timestamp: May 23, 2025, 10:36:55 am
content: I know this is an old thread but I was chatting with someone who worked at fluke during the time of the 5205a after I acquired one the other day. He said:Here is the story on that. In production of the 5205A we (Fluke) started having catastrophic failures of the power amp. We brought over an engineer from Eimac, the company that made the tubes. He looked at our use of his tubes on our power amps and said we are using them beyond the specified limits. The tubes were only surviving because we had that huge fan blowing air on them to try and remove the heat. His suggestion was to change the tubes to the ceramic version and to put a timer to track the use. It worked and we were back shipping them out the door.
Need schematic for a Sorensen Nobatron QB28-2 P/S - Page 1
Forum section: electronics / testgear

author: p38arover
author_rank: Newbie
timestamp: May 22, 2025, 06:14:22 am
content: Hi All,I have a Sorensen Nobotron QB28-2 rack mount variable power supply that I was given some years back. It has decided it no longer wants to regulate its output voltage and I need a copy of the circuit diagram, especially the regulator board. It gives 46 volts out - not the expected 18-36 volts range.I can't find any info about them on the 'net apart from basic specs.It appears to be somewhat different to the QRB series. If needs be, I'll have to pull the controller PCB and trace out the schematic - not something I'm that good at.I don't want to toss the PS in the rubbish bin.Cheers,Ron Beckett VK2OTCSydney, Australia

author: coromonadalix
author_rank: Super Contributor
timestamp: May 22, 2025, 04:20:15 pm
content: some manuals had schematics in them, ask the seller ..https://www.ebay.com/itm/113452765038maybe some where scanned ? no luck on google fuu

author: p38arover
author_rank: Newbie
timestamp: May 23, 2025, 04:43:11 am
content: How the heck did you find them? I searched, I Googled, etc., but came up with nothing. Thanks very much.I just found out that an ex-colleague thinks he has the manual (he also has a dead P/S) and will check when he gets back from overseas in a month's time. If I get one, I'll scan it and [post it on my website.Thanks again
Fluke 99B/105B serial comms - Page 1
Forum section: electronics / testgear

author: marlowe
author_rank: Newbie
timestamp: May 22, 2025, 08:06:33 pm
content: Hello,I'm currently creating a desktop app to record the measurements on my Fluke 105B. After approximately 400 head smashes into the wall I can now consistentlyretrieve the data from the screen. I've only been able to do this at 1200 baud. Pretty pretty slow. I see under the printer menu on these that 9600 is an option. I have had zero luckconnecting to/retrieving data at 9600. I was curious if anyone here had any experience communicating with these over serial. My main questions regard timing, and clearing it's buffer whichseems to accumulate every time I query for a measurement. It's just adding the screen measurements to all of the previous queries and increasing ~100 bytes every query.Any info is appreciated.
Freres64 initialization error R&S CRTU - Page 1
Forum section: electronics / testgear

author: Radioman260
author_rank: Contributor
timestamp: May 21, 2025, 11:56:43 am
content: I am using freres64 5.3.0, I downloaded the latest version of keysight from their website. Keysight is connected and I can send commands and get responses. When I try to setup freres I can set generator one and hit test and get a response. Same thing for analyzer. When I hit the play button I get initialization error.

author: Radioman260
author_rank: Contributor
timestamp: May 21, 2025, 11:24:38 pm
content: I've gotten a little farther, my original problem was I had not setup a secondary address. I have done that. Now I am getting a "Minium RF level error" when I hit the button in freres