hybridfree/eevblog-posts huggingface dataset:
RD6018 - Page 1
Forum section: electronics / testgear

author: wons
author_rank: Contributor
timestamp: December 15, 2021, 04:53:35 pm
content: HeyJust bought the reiden RD6018 and i want to controll it with custom softwareI tryed connecting it through the wifi module connector and rs232-usb converter but had no success connecting this way with their original softwarePlease help - how do i connect the riden RD6018 through serial TTL to my computer?BTW do i need to pull-up the "en" socket ?

author: bateau020
author_rank: Frequent Contributor
timestamp: December 15, 2021, 07:49:18 pm
content: Then either your unit is broken (but I doubt that since USB and WiFi use separate circuits), or you are doing something wrong. Please read up on how to use it (especially WiFi is counter-intuitive at first). There are some videos on how to use it, and a lot of git repos for interfacing with it.The custom software that is mentioned multiple times on this forum can also help a lot, and the documentation of the custom software has some pointers on remote control.https://www.eevblog.com/forum/testgear/custom-firmware-reference-document-for-riden-rd60xx-power-supplies/
Advantest U3751 (SA) "RF Unlocked" / PLL issue? - Page 1
Forum section: electronics / testgear

author: dgiese
author_rank: Newbie
timestamp: August 25, 2020, 04:50:59 am
content: Hi,I got a Advantest U3751 in my hands. It was about to be thrown away as it has this weird error. It was manufactured in 2005, so its a while. Advantest is not really helpful in regard to service manuals.After booting up, the device shows "Warning 7/81 RF Unlocked". When I run the Self-test, it complains about the RF_Registers and RF_PLL_Lock. The LO_PLL_Lock seems to be fine.I tried to hook up an external reference with 10MHz, but that did not make the warning disappear. I am kinda unsure where to look. The U3700 series does not seem to be too common.In the background of the warning the device seems to do its measurements. The test signals (e.g. 900MHz, 3GHz) I put on the input were off by a couple dozens kHz.Anyone had the same issue or an idea? Its a nice Signal Analyzer and I really want to use it

author: Gyorgy Albert
author_rank: Contributor
timestamp: December 15, 2021, 04:09:27 pm
content: Hello,I have a Advantest U3751, and I am looking to get in contact with other people who is owning/using this SA. I have some minor problems (some major were solved), but it seems that there are not too many users of this analyzer. I would appreciate is someone is reading this post, could reply, or send a message to me. As everybody knows, Advantest is not very friendly in such matters, and they are not giving any kind of service/maintenance information.Thanks,Gyorgy

author: dgiese
author_rank: Newbie
timestamp: December 15, 2021, 06:30:11 pm
content: My device is still un-assembled on my desk. I did a teardown, you can find them here:https://dontvacuum.me/teardowns/advantest-u3751I did also dump the CF card. I noticed, that the device actually works, but that there is an permanent offset. I was actually thinking of patching the error message, but got other stuff to do.Its kinda sad as that device is in a very convinient package.I have a few friends that work at Rohde&Schwarz, which apparently marketed the device a while ago. But they don't have access to any material
BK Precision 3011B Function Generator Service Manual? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: March 09, 2020, 09:17:37 pm
content: Does anyone have a SERVICE manual for a BK Precision 3011B 2 Mhz Function Generator? Thanks.

author: edavid
author_rank: Super Contributor
timestamp: March 09, 2020, 09:23:48 pm
content: 3011 or 3011B?Here's the schematic for the 3011.

author: Axtman
author_rank: Regular Contributor
timestamp: March 09, 2020, 09:29:06 pm
content: Oops. 3011B. Thanks for asking.

author: Axtman
author_rank: Regular Contributor
timestamp: March 09, 2020, 09:30:52 pm
content: I want to calibrate the instrument and remove the distortion at the peak and valleys of the waveforms. Thanks.

author: edavid
author_rank: Super Contributor
timestamp: March 09, 2020, 09:32:15 pm
content: Here's the cal procedure.

author: Axtman
author_rank: Regular Contributor
timestamp: March 10, 2020, 01:16:17 am
content: Thank you!

author: Axtman
author_rank: Regular Contributor
timestamp: March 10, 2020, 02:55:26 am
content: I just calibrated it and the function generator works great!

author: gdr771
author_rank: Contributor
timestamp: December 15, 2021, 05:36:39 pm
content: Thanks for posting this, as I can now repair a 3011 instead of tossing it. I wish all manufacturers would produce docs like this for their old equipment.
Tektronix RSA3408A RTSA battery replacement - Page 1
Forum section: electronics / testgear

author: G0HZU
author_rank: Super Contributor
timestamp: December 14, 2021, 11:31:48 pm
content: Hi, I've had one of these Tek RSA3408A RTSAs on my bench for a number of years now and this weekend the onboard coin cell battery finally died and the RTSA gave the classic battery error message on bootup about incorrect data press F1 to continue. It is possible to keep using it if a keyboard is fitted and F1 is pressed. It does bleat a message about the time/date being wrong and this can be tweaked as usual under its OS (Windows XP). However, I obviously wanted to fit a new battery...To my surprise there is nothing in the service manual about this battery, no info about the location of it or a part number. To cut a long story short I solved the issue of finding the coin cell location by looking in the RSA3408B service manual. It still doesn't get a mention anywhere but the cell holder is visible on the CPU board diagram. This is the vertical plug in board with an onboard fan that sits just behind the front panel.The coin cell is hiding behind a couple of metal card guides, so to see it these have to be removed. (Easy, just 4 screws)The battery in mine was a CR2032 with a white label stuck on it saying "Li-MnO2 DISPOSE OF PROPERLY"Once the location of the battery is known it is actually quite easy to replace it. It took a bit of fiddling to get the new battery to clip back in place but this was an easy job overall.It's just a shame it isn't shown in the service manual! I've started this thread purely to help anyone else who ends up googling for battery info about the Tek RSA3408A. The picture below shows the view from the rear of the instrument and this CPU board is right behind the front panel of the analyser on the top side of the instrument.
(?) Owon OW18B (6000 count): any hacks? - Page 1
Forum section: electronics / testgear

author: eti
author_rank: Super Contributor
timestamp: December 14, 2021, 06:19:33 am
content: Owon OW18B (6000 count): any hacks available to up the count to 19999 like the OW18E has?PS: I paid £17.99 *shipped* for this meter; one of those obscure amazon listings that have the brand name changed, and it’s buried amongst the results (same as how I got my Aneng V05B for £12.29) - is this a good price?Thanks folks.

author: paulbt
author_rank: Regular Contributor
timestamp: December 14, 2021, 11:04:44 am
content: Hi !Yes, buy an OW18D and swap the display

author: eti
author_rank: Super Contributor
timestamp: December 14, 2021, 06:31:42 pm
content: Errr what?
Fiber isolated Probes from Saker - Page 1
Forum section: electronics / testgear

author: mk_
author_rank: Regular Contributor
timestamp: December 14, 2021, 12:28:29 pm
content: Hi allWhile searching about Diffprobes for small signals on high common mode Voltages (at least 10kV) I found something calles ISOVP from an unknown company named Saker-MV. No Impressum, no price, no more details about the company, no teardowns, just a phonnumber somewere in Spain - maybe.... Google says that they are located in Madrid..So my question is: does somebody know more about them, specialy about their ISOVP-Probes (https://saker-mv.com/products/) and is willing to share this info here on the forum?TIA
Siglent SDM3045X multimeter not measuring frequency correctly - Page 1
Forum section: electronics / testgear

author: howard123
author_rank: Newbie
timestamp: December 10, 2021, 02:09:53 pm
content: Good morningI have a new Siglent SDM3045X multimeter which is not measuring frequency correctly.The test frequency being used is a 5 volt p-p 10kHz rectangular signal which has it’s pulse width adjusted to show that at certain pulse widths the SDM3045X meter does not read frequency correctly. On the meter I have tried using the auto as well as the 6v range and the rise time and fall times are 20nS.Here are the test results:Applied pulse width - SDM3045X frequency reading1uS - correct5uS - correct10uS - correct20uS - correct28uS - no readingrevert to 20uS - no reading30uS - random reading31us - correct52uS - random reading54uS - no reading82uS - correct95uS - unstable96uS - no readingI have used other input frequencies with similar results. I have tried ac coupling as well as dc coupling the meter input, without an improvement.It is mostly problematic as one can never be sure of a frequency reading without studying the symmetry of the wave. Sine wave measurements are correct.On contacting the Siglent factory I got this response; “Yes, the measurement for the pulse signal will be not stable. Usually the frequency measurement is more suitable for the sine.”Has anyone solved this issue?thanks HowardThe product details are s/n 34FBQ4R0876 SW 5.01.01.07R1 (changed) HW 03-00-00-05-00

author: tautech
author_rank: Super Contributor
timestamp: December 10, 2021, 05:53:50 pm
content: Welcome to the forum.You could try updating to the latest firmware V5.01.01.07R1 that you can get from here:https://int.siglent.com/download/firmwares/?ProId=25

author: howard123
author_rank: Newbie
timestamp: December 11, 2021, 06:26:29 am
content: Many thanks.I have installed the latest firmware but unfortunately that has not helped and the same problem still exists.

author: knudch
author_rank: Regular Contributor
timestamp: December 11, 2021, 07:51:50 am
content: Have tried that on my SDM3065XNo problemsJust to be sure that I understand what signal you apply10kHz/30uS means 30uS ON, 70uS off ?

author: howard123
author_rank: Newbie
timestamp: December 11, 2021, 02:33:10 pm
content: Thanks for your test result.Yes 30uS means 30uS high

author: knudch
author_rank: Regular Contributor
timestamp: December 12, 2021, 05:06:33 pm
content: Just studied the datasheet of 3045X, 3055 and 3065XThey are all different in respect to specificationI am surprised .... thought that was a simple matter

author: howard123
author_rank: Newbie
timestamp: December 14, 2021, 11:40:57 am
content: ThanksThis had actually worked prior to me changing two boards, which Siglent sent me for an unrelated warranty issue.Seems they have changed the design and spec fairly recently.
Megger AVO830 info - Page 1
Forum section: electronics / testgear

author: jdev99
author_rank: Regular Contributor
timestamp: December 13, 2021, 08:56:42 pm
content: My boss gave me this multimeter as a gift, for which I am very grateful. Being an electrician, it has some very nice features eg: VFD Low pass filter, LowZ option, phase direction detection.I noticed one annoying thing which I am not sure if it is a problem with the meter or just the way it is designed.When measuring for example 230V AC, on autoranging, it takes 3 times longer to give a reading compared to other meters in our dept. e.g: Brymen, UNI-T, Fluke.On manual ranging it is as quick as the others.Does this sound like a fault with the meter or just the way it is designed?Will it be possible to fix it with other firmware maybe?Thank you for any advice.Joe
Any experience of R&S NGM201? - Page 1
Forum section: electronics / testgear

author: tom66
author_rank: Super Contributor
timestamp: August 27, 2020, 02:03:02 pm
content: We're looking to replace our Keithley 2281S-20-6 due to aseriously problematic bug.Has anyone used the apparent R&S competitor to this product? How have you found it? Did you find any similarly silly errors in its implementation?Many thanks...

author: Kean
author_rank: Unknown
timestamp: August 27, 2020, 03:46:31 pm
content: User JxR has one per this threadhttps://www.eevblog.com/forum/testgear/new-rs-2-quadrant-power-supply-ngm200-20aug2019/

author: tom66
author_rank: Super Contributor
timestamp: August 28, 2020, 08:28:37 am
content: Thanks, have asked for feedback from him. Anyone else?

author: JxR
author_rank: Unknown
timestamp: August 28, 2020, 03:57:29 pm
content: Tom,Sorry I haven't been very active on this forum lately. I replied to your PM before seeing the thread. Since no specifics about the 2281 were in the PM I wasn't sure what the 'major bug' was before I replied.I'll see if I can perform the same test on the NGM202 for you and provide the results.

author: JxR
author_rank: Unknown
timestamp: August 29, 2020, 01:55:47 am
content: Tom,Here is a link to download the logging file produced by the NGM202. This is 8hrs of sampling at 0.1s sample rate. 3.3V across a 33kohm resistor.Anyways, I gave it a quick glance and it looks quite boring and very linear. Enjoy.https://www.dropbox.com/s/jpvml80dpho6vfu/log-20200828T091040.717.csv?dl=0I hope the NGM201 works out for you.

author: tom66
author_rank: Super Contributor
timestamp: August 29, 2020, 07:44:07 am
content: Thanks for the log JxR. Our concern is over the charge accumulation function which the NGM201 should support as well, do you know if it has the facility to log that? We can do the accumulation function manually, but we figure that having the instrument do it will allow us to take advantage of the higher sampling rate.

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: August 29, 2020, 12:57:01 pm
content: Have you considered just asking R&S directly about this? My experience with R&S tech support has been very good.We have a few NGM202's on the way, I can check when we get them.

author: Xandinator
author_rank: Contributor
timestamp: December 13, 2021, 07:59:44 am
content: There is an energy counter instead:MEAS:ENER:STAT ONMEAS:ENER:UNIT WSMEAS:ENER?
Teardown of Tektronix P6013 High Voltage Oscilloscope Probe - Page 1
Forum section: electronics / testgear

author: 13
author_rank: Contributor
timestamp: December 12, 2021, 06:54:42 pm
content: Hello,I recently purchased an old Tektronix P6013 High voltage Oscilloscope Probe to compare to a homemade probe I built (post coming soonTM). The tektronix probe can measure up to 12kV with a derating curve after 100 kHz. The construction is very simple compared to the liquid filled variants. Here are some of the pictures I took while tearing the probe head down. Further information can be found from the Wiki:https://w140.com/tekwiki/wiki/P601313

author: 1audio
author_rank: Frequent Contributor
timestamp: December 13, 2021, 06:14:28 am
content: That's pretty similar to the p6015. The shunt cap (triangular metal structures) are different from the p6015 but do the same thing. I have both and can share pictures of them shortly. Overall its a pretty ingenious design. The p6015 w/o Freon has about the same ratings as the p6013.
Oltronix B402 information search - Page 1
Forum section: electronics / testgear

author: Jouko
author_rank: Newbie
timestamp: December 13, 2021, 03:47:44 pm
content: Hello forum,I have Oltronix B402 power supply to refurbish.Does anybody have schematic diagram or other information?I tried already radiomuseum.org without results.BR,Jouko
MSO5000 FFT question - Page 1
Forum section: electronics / testgear

author: Sharp
author_rank: Contributor
timestamp: December 11, 2021, 07:47:56 pm
content: Hi guysI have a MSO5000 and are now looking into the FFT functionality and have a question for your guys.If you take a look at the attached MSO5000 screen dumps, I use a 10kHz sine wave 1 volt PP on the FFT 1 screen dump and a 10kHz triangular wave 1 volt PP on the FFT 2.The FFT setup is dBV and the waveform generator and the MSO is 50 ohm terminated.My question is on the FFT 1 screen dump – the 1 volt sine wave – The FFT analysis shows the first fundamental to -9.5 dBV – If I want to find the voltage from the FFT analysis I get: Voltage = 10^(-9.5/20) = 335mV - why is it not 1 Volt – what is wrong here

author: mawyatt
author_rank: Super Contributor
timestamp: December 11, 2021, 08:20:54 pm
content: Likely because 1Vpp is 0.3536Vrms for a sine wave.Best

author: Sharp
author_rank: Contributor
timestamp: December 11, 2021, 09:13:11 pm
content: Of cause I’m stupid@mawyatt Thank you

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 12, 2021, 12:43:46 am
content: Me Too!
Recommendation for cheap DMM with thermocouple reading ? - Page 1
Forum section: electronics / testgear

author: Jaunedeau
author_rank: Regular Contributor
timestamp: December 11, 2021, 05:50:38 pm
content: Hi,I own an about 20 y.o. Vichy VC99. I use it only a few times a year for hobby electronics (playing with LEDs and microcontrollers mainly).Compared to the Vichy, I hope to find one with :- Better feel (rather cheap plastic on the vichy)- not necessarily more precise (anything work to play with LEDs anyway), but would be nice if it could not change the reading all the time when you do nothing (honestly on the vichy, they could just have removed one number on the LCD)- No real need for an autorange, but could be nice if there is a fast one- Better continuity detection (the vichy is so slow, yes I tried buying better probes)- Something I would trust using to check the 230V outletsI want AA or AAA batteries only (I don't have an NiMH charger for 9V !)I *could* go for for the Unit-T UT61E+, it's a bit overpriced when compared to how often I would use it and the precision I need, but I can afford it. I would lost the thermocoupl reader (i'd still have the vichy for this).Is there any cheaper model I should consider ?Thanks,Jaune.

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: December 11, 2021, 06:33:34 pm
content: I recently got the Aneng AN870. It has temperature measurement and comes with a temperature probe. You can get it for about 40$ on banggood shipped, which i think is really good for what you get. It doesn't have much for protection so you won't want to use it on high energy stuff, but for temperature and general low voltage/low current electronics, I'd say it's really quite nice, specially for that price

author: myf
author_rank: Regular Contributor
timestamp: December 12, 2021, 05:36:49 pm
content: The ut-61c is a bit more expensive at 6000pts (not 20000pts) and has a temperature sensor.It can be connected to a pc via rs232 (free) or usb port (for less than 20eur).I have an ut-61e (the old one) without a temperature sensor, but I love it! I gave a ut-61c (or b or d, not the a nor the e) to my sons.The temperature sensor can be done in one step:Delta T = cst(well documented in wikipedia) * (measured) Volt.I prefer this old model ut-61e to the new one. There is also an ut-71-x at 40000pts, older, bigger, less protected (with small 5x20mm fuse). The versions depend on the x in [a,b,c,d,e]. It has both a temperature sensor and a usb link.These DMM use 9V batteries: (rechargeable or non-rechargeable). They last at least 1 year!I hope this will help you !F. from France.
Have the  DMM measure quite well an oscillating DC  - Page 1
Forum section: electronics / testgear

author: abdulbadii
author_rank: Frequent Contributor
timestamp: December 11, 2021, 01:03:24 am
content: How can our handheld DMM measure pretty well an oscillating DC current ?

author: bob91343
author_rank: Super Contributor
timestamp: December 11, 2021, 02:35:18 am
content: What exactly are you trying to measure? With what equipment?

author: Fungus
author_rank: Super Contributor
timestamp: December 11, 2021, 07:32:07 am
content: Quote from: abdulbadii on December 11, 2021, 01:03:24 amYou're going to need to define "oscillating DC current" very clearly before you get an answer that isn't "use an oscilloscope".

author: Grandchuck
author_rank: Super Contributor
timestamp: December 11, 2021, 04:06:25 pm
content: Are you asking about ac ripple riding on a dc signal?

author: Gregg
author_rank: Super Contributor
timestamp: December 11, 2021, 07:04:01 pm
content: Perhaps a DMM that measures duty cycle.

author: tggzzz
author_rank: Super Contributor
timestamp: December 11, 2021, 08:11:23 pm
content: Quote from: abdulbadii on December 11, 2021, 01:03:24 amA good starting point for the OP would behttps://entertaininghacks.wordpress.com/library-2/good-questions-pique-our-interest-and-dont-waste-our-time-2/

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 12, 2021, 12:01:44 am
content: If there is an AC voltage of any significance the modern good hand held (like a Fluke) will measure only the AC voltage.in AC modeIf there is also DC voltage it will measure that separately in DC mode.It will not add them together. A fancy bench meter like an HP 3456 will add them together, if you want it to.For your specific meter, you would have to read the instructions, some of these things work a bit differently than others.Some old fashioned analog meters add the DC to the AC volts in normal AC mode and some analog meters can measure AC separately, using a blocking capacitor.Some fancier analog meters work like a modern hand held and use the same sort of transistor circuitry, these things are not common.I do not think these meters are suitable for measuring ripple, it would have to be a pretty high ripple to even show up and ripple can be in higher freq than the meter can rectify to measure
Fluke 8840A VFD display (a little dim) looking for a good home - Page 1
Forum section: electronics / testgear

author: lmamakos
author_rank: Contributor
timestamp: December 13, 2021, 04:18:52 am
content: I just swapped out the display in my Fluke 8840A DMM as it was starting to get a bit dim. I installed the LED retrofit, obtained from eBay a couple of weeks ago, and am very happy with that solution. Now, I have the VFD that I removed from the DMM lingering on the bench, and I can't bring myself to just toss it in the trash can. It was working (though a bit dim) when I removed it.I'd be happy to USPS mail it to someone in the US for the cost of shipping; I estimate that to be $10 flat rate box rate. If you'd like to give this thing a new home, DM me and we'll figure it out. First come, first served.
Keysight Power Supply / free LCR meter promotion - Page 1
Forum section: electronics / testgear

author: SJFriedl
author_rank: Newbie
timestamp: December 11, 2021, 11:45:53 pm
content: I don't know if this is appropriate here, but I was able to take advantage of this promo and am so happy I can hardly see straight. Please remove if it doesn't belong.Until the end of 2021, buying a qualifying Keysight bench power supply gets you a free 1733C LCR meter (retail US$437), which is the higher end handheld unit and not the 1731C entry level (US$188) unit.I had been thinking and waffling about one of each, and though I'd been really impressed with the E36313A power supply, I didn't think I would actually ever use a triple-output supply so wasn't sure I could justify the cost (US$1911).But with the promo I decided to splurge, and amazingly, used all three outputson the first project- I needed 5V for control circuitry (output #1) plus 24V at 3amps to run a motor, so the auto-parallel mode of outputs #2 and #3 made this super easy. Love love love this power supply.Qualifying bench units are my E36313A triple output (high end of the E36300 series), the 400W versions of the E36200 series, plus a number of much higher end units. The PDF promo referenced below has the details.I purchased my power supply from Mouser Electronics, filled out the form, and the LCR meter was drop-shipped from Malaysia to me in Southern California USA (which surprised me). I also purchased separately a Kaiweets HT118A multimeter case from eBay, and the LCR meter fitsperfectly.References:Keysight promotional PDFLCR Meter pageJust a very happy customer, not a reseller etc.~~~ Steve
Agilent 34461A secure code issue - Page 1
Forum section: electronics / testgear

author: Coliban
author_rank: Regular Contributor
timestamp: April 10, 2015, 11:28:30 am
content: Hello,i thought, it was time to update this device, but when it comes to the update session, the 34461A wants a "secure code". But i do not know a secure code, or, i have forgotten. I think, i remember, that i didn't set a secure code, so it would still be the default code. Does anybody know the default secure code for the 34461A?Thank you!

author: HighVoltage
author_rank: Super Contributor
timestamp: April 10, 2015, 11:34:59 am
content: From the user manual:The factory-set security code is 'AT3446XA' For additional security this code may have been changed from its factory setting.

author: Coliban
author_rank: Regular Contributor
timestamp: April 10, 2015, 11:48:09 am
content: Thank you so much, high voltage,i remember that there have been a default password, but i didnt found a manual here and i didnt found the code in the internet.Thank you!

author: SJFriedl
author_rank: Newbie
timestamp: December 11, 2021, 06:40:47 pm
content: I can confirm this is still the default secure code for a 34465A purchased in late 2020.Thank you for this.
Need help with UT-60A data logging - Page 1
Forum section: electronics / testgear

author: bwims
author_rank: Newbie
timestamp: December 11, 2021, 02:59:15 pm
content: Hello,I have a UT-60A with an RS232 cable. It used to work when I had a computer with RS232, but it seems not to with two different RS232-USB adapters.I see with my phone that the data port is emitting pulses of light, but when I tried with UltraDMM, it said "No Data" . Since it used to work with a computer port, I must assume that the adapter is using the same TX/RX pins.I was considering buying a UT-D04 , but cannot find confirmation of compatibility with the UT-60A.Advice, anyone? What would be the best way to check for a working RS232 cable? A breakout box, perhaps? I'm only an electronics hobbyist, so please be kind!Many thanks,Brian

author: DEV001
author_rank: Contributor
timestamp: December 11, 2021, 04:50:59 pm
content: You might want to try it with the TestController software by HKJ or Sigrok as both supports many different types of Uni-T meters. I would test it in a serial program around 2400 baud 8n1 to see if you get any data. It should be compatible with the D04 cable.http://lygte-info.dk/project/TestControllerIntro%20UK.htmlhttps://sigrok.org/https://sigrok.org/wiki/Device_cables#UNI-T_UT-D04Another project has some info on the chip if you want to see the data format.https://github.com/cromarty/dmm/blob/master/docs/FS9721_LP3.protocol.md

author: myf
author_rank: Regular Contributor
timestamp: December 11, 2021, 05:39:29 pm
content: Hello,I use my ut61e and ut71 with the usb-cable d04.This cable (or usb chip) isn't bug free but I can use it on every laptop I had since about 4 years.My laptop are under ubuntu and I use sigrok.Some years ago (before improving usb device on laptop) I must reset by a short python script the usb-cable d04.I never can use the rs-232 cable with an usb converter device, but I only test low-cost Chinese device.Hope this help you...F. from France.
Keithley 6221 & 2182A Waveform logging - Page 1
Forum section: electronics / testgear

author: Pluscrafter
author_rank: Regular Contributor
timestamp: March 10, 2021, 12:55:04 pm
content: The setup is as follows the 2182A is connected to the 6221 via Trigger cable and the 6221 is connected to the network.My plan is that the 6221 should create a square wave (1Hz to ca. 50 Hz, 50% DCycle) and the 2182A log the data on 90degree. The Trigger out of the 6221 is set to tlink #1 and the Trigger In to tlink #2. The 2128A is set to external trigger. The Filter of the 2182A is on and the rate is set to slow.When the frequency is =< 1Hz it is working and the 2128A read the right values. But on a higher frequencies it seems that the 2128A is averaging the values. My understanding is that, if the phase angle reaches 90degree an trigger impulse is given to the 2182A the device reads the voltage.

author: Kleinstein
author_rank: Super Contributor
timestamp: March 10, 2021, 03:56:56 pm
content: AFAIK the K2182 has both some analog and digital filtering. The analog filtering is fixed frequency and normal exponential settling. So it take a relatively long time to fully settle and it may thus not be a good idea to use it with modulation so fast. The digital filter is usually a simple running average filter. If the data are send to a PC anyway, one could as well do the averaging later on the PC.With > 1 Hz modulation, one may consider to use the non AZ mode. This gives faster readings. Depending on the frequency the noise can be lower: the AZ mode wastes about 1/2 the time for reading a zero, but ideally suppresses 1/f noise this way. However with many Keithly meters the 1/f noise suppression does not work so well in all cases. So using non AZ mode may be attractive if one is interested in the modulated part. In this case one would not mind a slow offset drive.

author: dietert1
author_rank: Super Contributor
timestamp: December 11, 2021, 05:03:02 pm
content: Looks like the K2182A implements two autozero methods in two different input stages.One is called "Autozero" and the other one "Front Autozero". About "Autozero" the manual mentions a possible drift when disabling it for extended periods of time. About "Front Autozero" the manual mentions polarity reversal and that this method can be disabled when using the "Delta" method. The "Delta" method appears to be a third method of nulling the instrument.Anybody has more details? For example: Running the instrument with a low thermal short in CH1 in 10 mV range with "Autozero" enabled and "Front Autozero" disabled gives about 80 +/- 10 uV (!). Is this instrument damaged? With "Front Autozero" enabled it reads -80 +/- 10 nV.Regards, DieterEdit: The "Delta" method appears to be what the OP wanted to use.
Micsig STO1104C - Page 1
Forum section: electronics / testgear

author: Lango1818
author_rank: Contributor
timestamp: December 05, 2021, 06:09:11 pm
content: Hi AllI recently purchased a Micsig STO1104C, as per instructions, I plugged the charger in to fully charge the battery and it seem to just charge forever. I would expect to see 100% or something but the battery charge icon just keeps blinking on and on. This worries me as to battery life, I have an 8 year old HTC phone and it still takes a useful charge. According to the manual the unit should only take 6 hours to fully charge. I also noticed that the unit went dead flat just sitting there after 1 month. Everything I own with Lithium Iron batteries stays fully charged for months if not used and fully charged before storing. Me thinks I have a dud. Is any one else having similar problems??

author: Fungus
author_rank: Super Contributor
timestamp: December 05, 2021, 09:09:29 pm
content: That doesn't sound normal to me. Mine definitely cuts off when the battery is charged and it hardly goes down at all when it's powered off.

author: Silicium81
author_rank: Regular Contributor
timestamp: December 06, 2021, 07:23:22 am
content: I have also had a STO1104C for about a month, the battery charge is fine up to 100% and it does not discharge (or very little) when it is stopped.Maybe you could remove the battery to reset the device to see if that improves things.

author: Lango1818
author_rank: Contributor
timestamp: December 06, 2021, 08:44:06 am
content: Good idea I'll give it a go.

author: electr_peter
author_rank: Unknown
timestamp: December 06, 2021, 10:05:43 am
content: Battery behavior doesn't sound normal - it should hold charge for longer and fully charge when being charged. Good thing is these batteries are easily replaceable, just talk to your Micsig distributor.

author: Micsig_support
author_rank: Regular Contributor
timestamp: December 06, 2021, 10:13:05 am
content: or you can talk to Micsig.sales@micsig.com

author: 2N3055
author_rank: Super Contributor
timestamp: December 06, 2021, 11:38:08 am
content: Quote from: Micsig_support on December 06, 2021, 10:13:05 amLOL epic win!!

author: Lango1818
author_rank: Contributor
timestamp: December 10, 2021, 10:13:27 pm
content: I got in contact with AppVision where I purchased the item. They replied promptly and asked me to send a short video of the charging. MicSig is going to send me a replacement battery. So fingers crossed this fixes the problem.

author: Fungus
author_rank: Super Contributor
timestamp: December 10, 2021, 10:39:57 pm
content: Quote from: Lango1818 on December 10, 2021, 10:13:27 pmMicSig have been really responsive to users.
does anyone have Fordham LCR Bridge LC-340 manual? - Page 1
Forum section: electronics / testgear

author: playboy_shrek
author_rank: Contributor
timestamp: December 10, 2021, 11:54:00 pm
content: if so that would be great. it seems to be an old equipment from 70s or 80s. analog LCR meter thats completely manual. i cant find a manual for it online

author: bob91343
author_rank: Super Contributor
timestamp: December 10, 2021, 11:55:40 pm
content: Do you have pictures? It may be a clone of another marque which one might recognize.

author: bob91343
author_rank: Super Contributor
timestamp: December 11, 2021, 02:29:05 am
content: A nice little unit! However it rings no bells with me. Perhaps someone else recognizes it. I wonder what frequency it uses. Have you opened it?

author: playboy_shrek
author_rank: Contributor
timestamp: December 11, 2021, 07:45:54 am
content: i have not. i might be getting a manual soon from the seller.

author: bob91343
author_rank: Super Contributor
timestamp: December 11, 2021, 08:54:58 pm
content: The Phone jack implies that there is an internal oscillator, likely around 1 kHz. Except for the digital readout, it smacks of the venerable GR 650A.
Finest HR30/Pico TA234 Current clamp - Page 1
Forum section: electronics / testgear

author: Simon123
author_rank: Regular Contributor
timestamp: December 10, 2021, 09:36:05 pm
content: Hello!I have bought Finest HR30 current clamp. Unlike other AC/DC clamps it has AC or DC switch.But using it doesn't seem to do anything?I am wondering if im using it wrong or what. For example measuring DC current will give same meter reading no matter if AC or DC range is selected.Same goes for measuring AC or any other combined voltages.Any tips on using it properly?
HP 44491A General Purpose Relay Multiplexer for 3457A - Page 1
Forum section: electronics / testgear

author: DavidKo
author_rank: Frequent Contributor
timestamp: December 10, 2021, 08:43:38 pm
content: I have bought HP 3457A with 8 channel multiplexer card. So I have made small tear down.Interesting idea from Yokogawa HP (YHP) is their quick connect board.

author: DavidKo
author_rank: Frequent Contributor
timestamp: December 10, 2021, 08:45:34 pm
content: I have measured it and made my own for STP connector (as you can see bottom connector should be moved more forward).PCB with moved bottom connector is stored inhttps://github.com/konarik/HP-44491A-Breakout-Board, but feel free to use the source for your own board
Restoration Video: Tektronix 521A PAL Vectorscope - Page 1
Forum section: electronics / testgear

author: atkelar
author_rank: Contributor
timestamp: December 10, 2021, 10:41:26 am
content: I did another test-gear project - a PAL Vectorscope made by Tektronix in the early 1070s according to my research. The previous model was from the late 1960s, the PCBs say "copyright 1968", so the exact time is a bit of a puzzle to me, maybe someone here has a more detailed timeline. Recapping and recalibrating after a thorough inside out cleaning session... and when you use PAL and not NTSC it actually DOES workPS: still not sure if this is the right sub-forum for such presentations, please move/tell if not...
Looking for handheld Signal Generator with Vpp >20V - Page 1
Forum section: electronics / testgear

author: Magnum
author_rank: Regular Contributor
timestamp: December 09, 2021, 06:25:01 pm
content: Hello,I am looking for a handheld Signal Generator with sine wave, up to 75 Hz and Vpp > 20V, 25-30V should be sufficient.I have a Fluke 741, but it only goes up to 10V. My cheap Chinese Sig Gen goes up to 20V, but it is not enough.https://www.ebay.de/itm/193631309986?hash=item2d155350a2:g:3FcAAOSwoElfPnCLDoes someone know a solution?Many thanks.

author: J-R
author_rank: Super Contributor
timestamp: December 09, 2021, 06:57:52 pm
content: I'm not sure what your application is, but you could experiment with running a transformer in reverse to step up the voltage.

author: bdunham7
author_rank: Super Contributor
timestamp: December 09, 2021, 07:04:17 pm
content: An amplifier, and if you need portable/hand-held you would need to make a box with a 12V battery in it.https://www.ebay.com/itm/113463287367?hash=item1a6af05e47:g:8EQAAOSwM5tcJDUx

author: Magnum
author_rank: Regular Contributor
timestamp: December 09, 2021, 07:14:59 pm
content: It is to calibrate a RPM indicator which is connected to a Tach Generator. The indicator measures the frequency, but increases the minimum voltage with higher frequency. That is why 20Vpp is not enough, I need a bit more.It has to be a solution out of the box, as it will be used in the field.

author: Magnum
author_rank: Regular Contributor
timestamp: December 09, 2021, 07:17:09 pm
content: Quote from: bdunham7 on December 09, 2021, 07:04:17 pmThat seems to be a solution, thank you.

author: Henrik_V
author_rank: Regular Contributor
timestamp: December 10, 2021, 09:47:00 am
content: You can try any small line transformer with two 110V coils and use it as an 2:1 . (Spartrafoschaltung)little box with cable in and out as rugged as you build it and no additional powersupply neededif you don't need low output impedance, small audio transformer are cheap..
PSU recommendation - Page 1
Forum section: electronics / testgear

author: jtruc34
author_rank: Regular Contributor
timestamp: December 09, 2021, 12:28:40 am
content: Hi,I'm looking for a linear 2 to 3 floating outputs. I mainly work on audio (small signal or small power, max 30W), general analog circuitry (generally non RF but I might do it some day, though I doubt it'll really affect the PSU I'm gonna need) and microcontrollers (sometimes FPGA, but again, it is kinda of the same supply requirements).My budget is <800$, but it would be better to stay <500$, though it might conflict other requirements and I could reconsider my budget afterwards. I already own a Korad KA3005P. I find its interface really cheap, its rotary encoder is already half-broken and its precision is not very impressive, all of which are very acceptable for its price.Why I think I need more outputs is because I often need split-rails for audio, or different voltage level for different components, or some DC test signal to test a biais point or something similar. While I can use my signal generator for the latter, I then lose an output that could be valuable elsewhere.There are workaround for all these points, but this is just inconvenient.The last point I want to mention, is that over the last years, I've become more and more opposed to buying cheap and buying many things that I'll just use for 2 years. With this in mind, I would rather buy something with things I don't need yet but that I am "obviously" going to need in the future, and I also rather pay a little more for a western brand than a little less for a chinese company with questionable working conditions somewhere in the production line.The two options I have is buying new, and there aren't that many options in that price range, or to buy used, and there, there is much too many options. I should write an e-mail to my university to see whether they sell/throw away (they've got too much money to spend) some of their old equipment.What are your thoughts?Thank you

author: PeterKlop
author_rank: Contributor
timestamp: December 09, 2021, 12:51:04 am
content: The GPP models from GW Instek are nice to use, very decent quality and a lot of value for the money.

author: electronic_guy
author_rank: Regular Contributor
timestamp: December 09, 2021, 01:00:51 am
content: You could go with a HP Agilent 3631A which is a triple output power supply with 6V/5A, +/-25V/1A or a HP Agilent 3646A a dual output power supply with 8V@3A,20V@1.5A. Both goes for around $500 on ebay used market.The good thing with buying a well known brand that has stayed for a long time is that there are many resources to get support from and when it comes to HP, they have well documented service manuals. Also in case you don't need em anymore, you could easily sell them at the same price or more, most of the time. Those time tested equipment hold their value over time just the same.

author: nctnico
author_rank: Super Contributor
timestamp: December 09, 2021, 05:01:13 pm
content: Why buy old crap if there is budget for new? IMHO the GW Instek GPP series is a very good choice nowadays.
Missing pages in Datron 4700 user manual - Page 1
Forum section: electronics / testgear

author: giovannirat
author_rank: Regular Contributor
timestamp: December 04, 2021, 09:21:35 pm
content: Hi all, I am trying to find somebody who has a physical copy of the Datron 4700 user manual and could scan and send me the pages 5-5, 5-6, 5-13 and 5-14 from this user manual.And yes, there is a Datron 4700 user manual available online, but these pages are missing in all the manuals I found.Thank you very much.

author: giovannirat
author_rank: Regular Contributor
timestamp: December 07, 2021, 09:07:47 am
content: If anyone is interested, a helpful expert has sent me the missing pages.

author: perdrix
author_rank: Frequent Contributor
timestamp: December 08, 2021, 10:34:54 am
content: And the updated manual has been uploaded to the Datron-Wavetek group files area at groups.ioDavid (group owner of Datron-Wavetek)
HP-5314A Serial 2036A09492 TCXO  - Page 1
Forum section: electronics / testgear

author: W8RLC
author_rank: Newbie
timestamp: December 09, 2021, 05:45:35 pm
content: I am currently working on an HP-5314A serial number 2036A09492. Later versions of the manual state that when installing a TXCO that protection diode A1CR4 should be installed. So I am looking for a manual that covers the serial number for my unit that has a readable figure 8-8, a photo of the board is too dark to determine any detail. I am trying to determine the location of diode A1CR4 so if it is not installed I can install it on the 2036 version A1 board. So if you have a copy of the manual for my version or a clear figure 8-8 that you could share it would be appreciated.
Can I plug 4mm Standard banana plug to Agilent 3632A power supply output ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: December 08, 2021, 05:37:59 am
content: Hi,Needs to know which power cables are supported for Agilent 3632A power supply. Is it possible to use 4mm banana plugs with this ?Thanks.

author: batpuncher
author_rank: Newbie
timestamp: December 08, 2021, 07:52:53 am
content: Yes you can, either non-shrouded or retractable shroud plugs.
New RTB2000 firmware: v2.4 - Page 1
Forum section: electronics / testgear

author: cmumford
author_rank: Contributor
timestamp: December 07, 2021, 02:59:34 am
content: Looks like Rohde & Schwarz just dropped a newversion(v2.4) of firmware for the RTB scope. Details inrelease notes.It includes:Device name. See setup menu.Up to six measurement places.New measure type 'Delay to Trigger'.Second cursor source.New math functions track: period, frequency, pulse with and duty cycle. See also App andDemo menu.Option RTB-B6: Symmetry function for waveform type Triangle

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: December 07, 2021, 07:07:15 pm
content: Dear cmumford,you can find a discussion on this new firmware onhttps://www.eevblog.com/forum/testgear/new-killer-scope-a-true-game-changer-from-rs-rtb2002-rtb2004/2975/(and below) where Rich (from R&S) announced it a couple of days ago.
fluke 3330B fault current - Page 1
Forum section: electronics / testgear

author: NRP_SANTOS
author_rank: Newbie
timestamp: December 07, 2021, 02:19:20 pm
content: Hello friends, I'm looking for help repairing my fluke 3330b.his problem is in currents above 3ma. Whichever scale is selected, it always maintains 6ma of output.Best regardsnrp_santos
Digital Ocscilloscope under 300$ recommendation - Page 1
Forum section: electronics / testgear

author: coed1992
author_rank: Newbie
timestamp: December 06, 2021, 07:31:37 am
content: Good day to everyone. I am just an intermediate electronics enthusiast and just begun to venture the journey of car audio amplifier repairs a couple months ago. A lot of affordable digital oscilloscope are out there in the market today like Hantek, Owon, Fnirsi. Can you please recommend me an entry level one like 250$ to 300$ good enough that I can use as intermediate troubleshooter. Thanks a lot.

author: Andrew_Debbie
author_rank: Frequent Contributor
timestamp: December 06, 2021, 09:46:45 am
content: Have a look at this recent thread:https://www.eevblog.com/forum/testgear/living-overseas-want-to-buy-first-scope-limited-options-rigol-1102z-e/Hantek DSO2x1x (DSO2C10 is under $200)Rigol DS1102Z-E or DS1054Z ($350??)Siglent SDS1104X-U (just over $400)You get what you pay for. The more expensive ones are better but maybe the $180 Hantek DSO2C10 is good enough.

author: Fungus
author_rank: Super Contributor
timestamp: December 06, 2021, 10:06:20 am
content: I'd stretch the budget a little bit and go for the Rigol DS1102Z-EQuote from: Andrew_Debbie on December 06, 2021, 09:46:45 amYep. Hantek's reputation is for low feature count, buggy firmware and constant lockups.A quick google search will reveal the horrors:https://www.google.com/search?q=DSO2D10+bugsOwon is similar, FNIRSI's specs are complete fiction. The Rigol is the cheapest 'scope that's really worth owning.

author: lugaw
author_rank: Regular Contributor
timestamp: December 06, 2021, 10:25:31 am
content: Get a Rigol, very reliable and feature rich and have your price range covered.

author: Andrew_Debbie
author_rank: Frequent Contributor
timestamp: December 06, 2021, 10:32:22 am
content: Quote from: Fungus on December 06, 2021, 10:06:20 amHantek fixed the lockups. Current firmware is much improved. No amount of patching will fix the cost cutting needed to hit the < $200 price point. See my short review in the linked thread.If you are looking for a 100-150 MHz 'scope and only have $200 the Hantek is the best option. If you have the budget, get the Rigol or Siglent.

author: Fungus
author_rank: Super Contributor
timestamp: December 06, 2021, 01:03:52 pm
content: Quote from: Andrew_Debbie on December 06, 2021, 10:32:22 amThey only give you one probe???

author: Andrew_Debbie
author_rank: Frequent Contributor
timestamp: December 06, 2021, 01:46:51 pm
content: Yes, only one probe. Which is why the $180 DSO2C10 really costs ~200.That doesn't bother me. The external trigger does.Like I said earlier you get what you pay for. Eventually I will get a Siglent SDS1104X-E. The X-E is £454.80($600) with tax and shipping, double the OP's budget.

author: rsjsouza
author_rank: Super Contributor
timestamp: December 06, 2021, 01:52:12 pm
content: Another recent related thread.https://www.eevblog.com/forum/beginners/best-budget-oscilloscope-for-beginners-(rigol-ds1052e-vs-rigol-ds1202z-e)/msg3836627/#msg3836627As others have said, if you have the budget, Siglent or Rigol are the best options.