hybridfree/eevblog-posts huggingface dataset:
Uni-T UT181A battery? - Page 1
Forum section: electronics / testgear

author: iXod
author_rank: Frequent Contributor
timestamp: May 03, 2021, 08:29:56 pm
content: Every site selling this meter that I’ve read says that the replaceable battery (not provided) is a rechargeable li-ion 2200 mAh, 7.6 V cell. But none of them state any part number or form-factor.Anyone who owns one can tell me?Thanks.

author: Fraser
author_rank: Super Contributor
timestamp: May 03, 2021, 08:50:44 pm
content: Found this for you. Not in stock but label provides part number etc. Battery is Lithium Polymer so you just need to find a pack with the correct voltage, capacity and dimensions to fit in the meter.https://www.aliexpress.com/item/32962838907.htmlFraser

author: Fraser
author_rank: Super Contributor
timestamp: May 03, 2021, 08:54:17 pm
content: LARGE P425085 Li-Po batteryhttps://ramuk.intertekconnect.com/WebClients/ITS/DLP/products.nsf/4c8700f3b75987a08525777700583333/cac8b009eb979be786257e6e002c08f8?OpenDocument

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 04, 2021, 12:47:07 am
content: I guess you must charge that thing often. 2000mAh isn't all that much and that thing has color display must suck a lot of power.
Looking for help with diagnosis/repair of an Agilent N9320B spectrum analyzer  - Page 1
Forum section: electronics / testgear

author: swperk
author_rank: Regular Contributor
timestamp: May 05, 2021, 01:47:23 am
content: I just got an Agilent N9320B that is in like-new shape and boots up fine to a a normal looking trace, complete with the LO feedthrough at 0 Hz. Unfortunately, there seem to be two issues:First, there is no output from the cal connector on the front panel. It should be 50 MHz @ -10 dBm, but looking at it with both a known good spectrum analyzer and a broadband power meter, absolutely nothing is there. I've searched through the relatively sparse documentation and explored all the menus, but there does not seem to be an on/off control for the calibrator, so I'm assuming it's supposed to be on whenever the SA is powered on.Second, and more importantly, the analyzer shows known input signals to be lower in amplitude than they really are. At lower frequencies, the errors are greater (e.g., ~18 dBm low at 100 MHz), with decreasing errors (higher amplitudes) at higher frequencies (e.g., ~8dBm low at 3 GHz). Could this be something as simple as a fractured trace or marginal connector in the input signal path, or might it be a damaged first mixer or other component in the path?Any ideas, help, troubleshooting suggestions, schematics, etc. are very welcome!Thanks,Stan
MC SLS4-B Banana Plug? - Page 1
Forum section: electronics / testgear

author: OnTheKill
author_rank: Newbie
timestamp: May 03, 2021, 03:58:21 pm
content: I have always been a fan of Pomona 1825 and 1325. Good quality, I prefer solder termination tho. I bought a bunch of used Multi-Contact SLS4-B yesterday. They are nickel plated. Can anyone tell if the hollow cylinder bananas are good? I'm curious if they can retain their 'tightness' better than the common plugs such as the Pomona or just come loose in a few pulls?TIA
SIGNALION SRCC-10M-V1 - 10MHz TCXO and Distribution Amplifier - Page 1
Forum section: electronics / testgear

author: DC1MC
author_rank: Super Contributor
timestamp: December 28, 2020, 02:57:00 pm
content: Hello everybody, I have found this board and because I actually need to finally finish the 10MHz Rubidium GPSDO project I was looking at this board, but I wasn't able to get any info, it does seem to accept external output and it has some TCXO onboard:https://www.ebay.de/itm/10-MHz-TCXO-und-Distribution-Ampifier/192575128477There just a couple left (67% sold). s I should decide soon. The outputs seem to be driven by modular amplifiers that may be repuposed.What is the forum gurus opinion, is it worth the money ?Cheers,DC1MC

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 28, 2020, 03:05:12 pm
content: Seems fine if you forget the internal TCXO and just input your signal at the Splitter connector. Form factor is not really the best for DIY stuff I think.

author: DC1MC
author_rank: Super Contributor
timestamp: December 28, 2020, 03:14:50 pm
content: Quote from: PA0PBZ on December 28, 2020, 03:05:12 pmOn the large space between the output amplifiers and the backside connectors want to put the Rubidium oscillator and the GPDSO board. All of the assembly will be seated an an older VHS player case that has a nice linear PS as well.DC1MC

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 28, 2020, 03:17:04 pm
content: Looks like you are fine then

author: FransW
author_rank: Frequent Contributor
timestamp: May 03, 2021, 11:16:42 am
content: Quote from: DC1MC on December 28, 2020, 03:14:50 pmI use this board the way Paul describes.Whether it is really worth the money is a question to decide for yourself.The board works, however, the seller can give no further information.I tried to find the source but failed.So I use this board as a 10MHz distribution board.Frans
ez digital fg-7002c (anyone know about these?) - Page 1
Forum section: electronics / testgear

author: HendoNZ
author_rank: Contributor
timestamp: April 30, 2021, 08:10:15 pm
content: Hi all,I recently came into position of a couple of ez digital fg-7002c function generators. I can't find that much about ez digital - apart from it used to be called LG precision.Anyway - does anyone have any experience with these units? I've noticed that they seem somewhat touchy to use and hard to fine tune a frequency. Just want to know if it's normal with these units.Cheers

author: tv84
author_rank: Super Contributor
timestamp: April 30, 2021, 09:13:37 pm
content: Look atthisopinion.

author: HendoNZ
author_rank: Contributor
timestamp: April 30, 2021, 11:29:22 pm
content: Yeah, what I thought hard to dial in and not the most stable of counters.Anyone got a service manual? (I can only find a operating manual)
Mini VNA  Generation 1  V. 224 - Page 1
Forum section: electronics / testgear

author: cleanworkbench
author_rank: Regular Contributor
timestamp: May 05, 2021, 09:23:32 am
content: Not sure where my original post went so i,m sticking this up again.The blue rectangular box from mini radio solutions , a competent little VNA that works well on windows BUT can i get this Gen 1 VNA to work on Linux system ?.And can i enable it for a smith chart up grade or has the plug been pulled on this old product .Has it got something to do with VNA J program???.I am not a computer expert , just need some pointers please in the right direction.https://www.radioamatore.info/attachments/article/1590/miniVNA%20manual.pdfThank you
TEquipment free rigol ds4024 upgrade from 200 to 350 mhz software keys - Page 1
Forum section: electronics / testgear

author: tequipment
author_rank: Regular Contributor
timestamp: April 30, 2021, 06:57:15 pm
content: We have a few software keys for a bandwidth upgrade for the 4024 200 mhz to 350 mhz. If you can use this key please send me a message with your model and if you bought it from us and need the key. It's limited to a believe 3 software keys. When we are out we are out.https://www.tequipment.net/Rigol/BW2T3-MSO/DS4000/Options/is the option.Evan CirelliVice President and Co-Founder"Buy from people, not just the Internet"™TEquipment
RD Tech Riden DPH5005 - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 30, 2021, 11:09:11 am
content: I want to use this DPH5005 with 12V input can I get 24V out of it and with how much current? Can I get up to 50V with 12V input at reduced current?

author: bianchifan
author_rank: Regular Contributor
timestamp: April 30, 2021, 04:43:30 pm
content: Quote from: BeBuLamar on April 30, 2021, 11:09:11 ammax. output current: 5A!BTW, my preferred usecaseQuote from: BeBuLamar on April 30, 2021, 11:09:11 ammax output current 5A, max power 250W, max input current 10A!So.. 12V x 10A, fine.50V / 12V ~4, 10A/~4 => ~2A (regardless efficiency)For detailed infos please look here:Lygte Test DPH5005
Can i somehow add an option to my Fluke 54100 videosignal generator? - Page 1
Forum section: electronics / testgear

author: helltron
author_rank: Newbie
timestamp: April 30, 2021, 02:38:24 pm
content: Hi! I could get my hands on an old Fluke 54100 video generator for little money. Unfortunately this one only got PAL installed, even if the device itself has buttons for NTSC and SECAM. I found out that my unit was build only with option "54011" and for NTSC i would need (also) option "54012".Does anybody know if that could be added? Maybe by only giving a unlock-key?I really can't think of that the software would not contain everything and it's only locked by a flag in Flash/EEPROM somewhere...
Uni-Trend UT195E mod - Page 1
Forum section: electronics / testgear

author: cosmin1
author_rank: Regular Contributor
timestamp: April 27, 2021, 04:50:12 am
content: Hi guys.Do you think this multimeter can be moded to show up first the DC, not the AC when voltage is selected?It's very annoying that every time i turn it on or select again the voltage, i have to push the SELECT button too, for measuring DC.

author: cosmin1
author_rank: Regular Contributor
timestamp: April 28, 2021, 10:58:37 am
content: Nobody?I saw the UT61E is modded by many users.This is the board:

author: DavidAlfa
author_rank: Super Contributor
timestamp: April 28, 2021, 08:58:22 pm
content: Dump U2 and let's start playing
Advantest R3671 Spectrum Analyzer input error - Page 1
Forum section: electronics / testgear

author: mjames
author_rank: Newbie
timestamp: April 29, 2021, 07:21:44 pm
content: I bought an Advantest R3671 Spectrum Analyzer and it has a constant -20 dB error across all frequencies. The frequency is always correct. It passes all self-tests. When I have it do a self-cal, it gets the error "IF input level out of range", -2544. The manual lists this as a cal error. It's internal 50 MHz 0 dB reads correctly when I feed it to another spectrum analyzer.Anyone has any insight into this?Best,-- Mark
cJTAG FLASH programmer CCS and F280049 - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: April 28, 2021, 06:57:31 pm
content: I have been playing with a TI F280049 for a few days. So far only on a Launchpad development board that has a built in FLASH programmer and debugger. I now want to move to a custom board using just the F280049 so I will need an inexpensive FLASH programmer.I can debug on the development board if necessary so I only need FLASH programming capability, preferably with the cJTAG interface because of the low pin count. TI recommended their XDS200, priced at about $500 so that breaks the inexpensive criteria.Any suggestions?Hmm..... I suppose I could use the launchpad development board as a FLASH programmer by simply redirecting the signals to the custom board.

author: BFX
author_rank: Frequent Contributor
timestamp: April 29, 2021, 08:31:06 am
content: Yes you can use Launchpad development board as a programmer/debugger.Remove those jumpers and wire some cables to your new board.
Keysight (Agilent) 34450A Firmware update not working - Page 1
Forum section: electronics / testgear

author: ollihd
author_rank: Regular Contributor
timestamp: April 21, 2021, 09:44:43 am
content: Hi all,Trying to update the firmware on my 34450A. Installed all the Keysight-software to get Windows 10 device manager to recognize the meter, downloaded the latest firmware .exe. Can see and select the meter from the dropdown, but when I press "start", the software does nothing. I can select the meter again from the dropdown and do the same thing all over again. It seems like the software can't start the update process. Anyone get this to work on Windows 10? Is there a way to do it from an USB-stick? I have tried running the firmware .exe in compatibility mode with no luck.

author: ollihd
author_rank: Regular Contributor
timestamp: April 21, 2021, 11:03:48 pm
content: Tried re-installing all the Keysight software, tried older versions, tried different IVI-drivers, triend older firmware-updaters... nothing seem to be working. All the firmware updaters find the instrument, instrument can be selected, but when update should start, it stops immediately. After the stop you can press refresh and start all over again. Always the same.

author: ollihd
author_rank: Regular Contributor
timestamp: April 28, 2021, 11:21:54 am
content: Problem was solved with the help of Keysight support. It turns out if you have your region format on Windows set to English (Finland) it switches the period and comma and the update won't work. Switching it to English (US) = everything went smoothDarn Finns!
AeroFlex Easy Span II Software - Page 1
Forum section: electronics / testgear

author: veryevil
author_rank: Unknown
timestamp: April 28, 2021, 10:48:06 am
content: Hi, does anyone have a copy of Easy Span II as I would love to get my spectrum analyser connected to my PC. No trace of it on web at all.IFR bought by Aeroflex bough by Cobham bought by ViaVi so no chance of support there.ThanksSteven
Question on “IF Ovl” warning of the R&S FPC1500 in VNA mode. - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: April 28, 2021, 09:32:12 am
content: I am using the R&S FPC1500 with pleasure, I appreciate the technology as well as the user interface. Sometimes I do have questions though. One is the question below…In the VNA mode, when I perform a “Transmission S21” measurement, I see a red “IF Ovl” warning appears most of the time, no matter whether there is through, a passive DUT, or an open cable between the two ports. Also in the combined “Refl/Transm S11/S21” measurement I get the same warning. Stays also after I do proper normalisation of S21 in that VNA mode. There do not seem to be any parameters (attenuation, turn PA off etc.) that can be edited in the VNA mode that may be related to this. While the measurement look rather normal to me, not sure whether I should see this warning and the consequences of it.In the FPC Spectrum Analyzer User Manual (1178413002, Version 09) I find little information on this warning, only on page 351:“This bit is set if the IF path is overloaded. ’IFOVL’ is displayed.”. While not the same device, the manual of the R&S Spectrum Rider seems to give additional information:“IF Ovl: This message indicates that the downconverter of the intermediate frequency (IF) is overloaded […].”Interestingly, in the regular ‘Spectrum’ mode, activating the tracking generator, and then perform an S21 measurement in that mode, I do NOT get that warning. Even if I set the tracking generator level at 0dBm, and the RF input attenuator at 0dB. The resulting measurement of a through cable and of some known DUTs look the same as when measured in the VNA S21 mode, but now without the error message.Also in regular spectrum measurements, using an external signal source, the “IF Ovl” warning behaves as expected. Set at 0dB attenuation and -10 dBm reference level, and fed with a 20MHz sine wave, the warning appears when the input signal is -4dBm or stronger. (As Shahriar in his TSP #121​ episode (at 0:20) already noted, one needs to select a limited span on the FPC to make sure the warning appears; in my case a span of 30MHz or lower works.)So the VNA mode seems to be the odd one out…Any experiences/advice?
HP 5/6/7000 series UI - Page 1
Forum section: electronics / testgear

author: artag
author_rank: Super Contributor
timestamp: April 27, 2021, 07:56:34 pm
content: I'm very happy with my Agilent 7014 A (especially with certain .. upgrades noted here) but one thing bugs me.Changing from auto trigger to normal requires going through a menu.There was an upgrade to a B series of the scope which added some front panel buttons but they're mostly to do with trigger searches and as far as I know don't allow a single button toggle of auto / normal.Auto handles a lot of cases but at low sweep speeds or where a DC trigger is needed I find a quick flip very useful.Does anyone else find this inconvenient ? Is it common on later HP (agilent,keysight,whatever) equipment, or on others ?

author: nctnico
author_rank: Super Contributor
timestamp: April 28, 2021, 08:13:28 am
content: Great scope but the UI leaves much to be desired. I sold my 7000 series and kept a GW Instek because the latter is so much more convenient to drive.
Tektronix 465 DM44 time base problem - Page 1
Forum section: electronics / testgear

author: Bogdan tek
author_rank: Newbie
timestamp: April 27, 2021, 07:36:10 am
content: Hi, please help me.I have repaired a tek 465 with DM44 and is almost ok, the only problem remained is that in MIX MODE (with the use of dual time base with different timing by pulling the time base knob) I do not succeed to have on the screen the usual - (in the left part of the screen with slow speed time base and in the right part of the screen the fast time base). I mention that the " delay time position "multiturn vernier do not have the fine demultiplier, is just a knob without any numbers.I try to measure some transistors in TB and i switch between then ICs but nothing was changed. The weird thing is that the delayed time base seems to work ok in A INTEN and B DLY'D .Please, someone with a tek 465 WITH DM44 can tell me if this is normal? Maybe this is because of the DM44 wich interfere with the delayed time base ?(Off the topics, I repaired a tek 464 and with the same settings it work ok, in the left part of the screen I have the slow TB and in the right the fast, the transition point being controlled by the delay time position multiturn pot).Someone with the 465 AND DM44 can help ? Maybe to simulate my settings on your instrument?Thank you!

author: PaulAm
author_rank: Frequent Contributor
timestamp: April 27, 2021, 02:45:37 pm
content: The delay knob doesn't have a ten turn dial because the DM44 display is used to show the delay.

author: Bogdan tek
author_rank: Newbie
timestamp: April 27, 2021, 11:34:01 pm
content: Thank you, I presume this because I notice that is a corelation between the two knobs.But is normal for this configuration to show in MIX mode only the delayed time base ?Is hard to explain what is the difference betwen my 464 and 465+DM44 , mainly I am worried because with the same settings, my 464 show for example half a screen with the main time base and the seccond half with the secondary time base which is normal. My 465 show only the delayed time base (is the same time per division on the entire display) and I can move left or right the window with the delay knob.So is different from the 464 (for example).Is this normal for the 465 +DM44 ?Can I do something to look like 464 delayed MIX mode ?Do you have a 465 equipped with DM44?Thank you.
[ask] international webstore for siglent multimeter - Page 1
Forum section: electronics / testgear

author: e0ne199
author_rank: Regular Contributor
timestamp: April 11, 2021, 08:52:24 am
content: hello everyone, i want to buy a siglent multimeter (SDM3055?) from a webstore, but i don't know which webstore provides international shipping for siglent products...anyone here knows a good webstore that sells siglent products internationally?? i don't really want to buy siglent products from websites like aliexpress , ebay or something like that because i had some bad experiences when i bought expensive things from those websites...btw any answer is appreciated, thx

author: tautech
author_rank: Super Contributor
timestamp: April 11, 2021, 09:37:11 am
content: The list of suppliers is here:https://int.siglent.com/map/You could try contacting the Siglent sales team and asking for the contact details of your nearest dealer.

author: e0ne199
author_rank: Regular Contributor
timestamp: April 11, 2021, 10:46:07 am
content: Quote from: tautech on April 11, 2021, 09:37:11 amcan i buy siglent product from this website (int.siglent.com )??

author: tautech
author_rank: Super Contributor
timestamp: April 11, 2021, 11:14:06 am
content: Yes but why not someone local to you ?Contact Authorized IndonesiaPT. YOUNG DINAMIS INDONESIAhttp://siglent.id/product/sdm3055-5-%c2%bd-digits-dual-display-digital-multimeters/

author: beanflying
author_rank: Super Contributor
timestamp: April 11, 2021, 11:22:07 am
content: I did this in Oz a while ago and looked at importing a Siglent 2042 compared to buying local and the difference was under 10% and then no local backup if anything went wrong. Sometimes it isn't worth every last $ IMO and in particular in this case it was about the level of a box of good BeerBe serious and look carefully at what the actual landed price including freight to you (with Tax/Duty if they apply) is against local and not just the website price.

author: nctnico
author_rank: Super Contributor
timestamp: April 11, 2021, 11:31:31 am
content: Quote from: tautech on April 11, 2021, 11:14:06 amYou do realise that Indonesia stretches for a longer distance than the USA is wide (coast to coast)? Depending on the OP's location Australia, Malaysia or Australia may be closer.

author: e0ne199
author_rank: Regular Contributor
timestamp: April 27, 2021, 06:12:44 pm
content: Quote from: tautech on April 11, 2021, 11:14:06 amwow didn't know about that...thx

author: e0ne199
author_rank: Regular Contributor
timestamp: April 27, 2021, 06:14:07 pm
content: Quote from: nctnico on April 11, 2021, 11:31:31 amhaha i have never realized that there is actually a siglent representative in my country
Quartz Check - Gill Instruments (crystal frequency checker) - Page 1
Forum section: electronics / testgear

author: keef46
author_rank: Contributor
timestamp: April 27, 2021, 09:52:59 am
content: Has anyone ever come across this before? (see the photo's) And know of anything similar still available?

author: justanothername
author_rank: Regular Contributor
timestamp: April 27, 2021, 10:30:26 am
content: Do you have access to this and may be able to make a teardown? This looks incredibly useful!

author: keef46
author_rank: Contributor
timestamp: April 27, 2021, 10:54:58 am
content: I don't own it - one of our suppliers was using it to check some issues we were having with clock drift....seems to work TBH - in as far they used it to tweak the crystal cap values. I'm testing some modded boards now - and seems fine.I will try and get some more photo's.

author: keef46
author_rank: Contributor
timestamp: April 27, 2021, 12:40:23 pm
content: PCB photo....

author: justanothername
author_rank: Regular Contributor
timestamp: April 27, 2021, 12:42:16 pm
content: Very good! maybe you can unscrew those two screws and make a picture from the underside with the tracks?I guess whats going on here is a very narrow high sensitive amplifier creating pulses and then XOR-ing them with the 74HC86 so that you get the beat frequency with the reference XTAL.The beat frequency is used to clock the binary counter 74HC136 which is decoded for the leds by the 74HC237.The rest with the 555timer is just there that this thing runs for a defined period of time once the button is pressed, I think.
USB SCPI Control with Keysight 3446x Multimeters - Page 1
Forum section: electronics / testgear

author: Sparky49
author_rank: Regular Contributor
timestamp: April 27, 2021, 07:34:04 pm
content: I'm trying to use my copy of Matlab (2019, 64 bit) to control a Keysight 34465A multimeter through USB SCPI. However, I am stuck as the only IVI driver for the 3446x which I've managed to find (fromhttps://www.keysight.com/my/en/lib/software-detail/driver/3446x-digital-multimeters-ivi-and-matlab-instrument-drivers-2352538.html) say they only support the 32-bit version of Matlab.I've tried looking for alternate means of connecting, such as 64 bit drivers, but have had no luck. Does anyone have any suggestions as to how I might accomplish this? My programming ability is fairly low, so rolling my own driver is above my level.

author: alm
author_rank: Super Contributor
timestamp: April 27, 2021, 09:26:05 pm
content: Does theVISA integration through the instrument control toolboxwork with your version of Matlab? I haven't done instrument control with Matlab, but I think it should allow you to send SCPI commands similar tothis example. Information on the SCPI commands should be in the 34465A documentation.
E4421 sucefull LCD repair  - Page 1
Forum section: electronics / testgear

author: Gregory
author_rank: Regular Contributor
timestamp: April 27, 2021, 04:07:08 am
content: Yesterday when I turned the E4421 the LCD screen was not working properly, showing random black and white linesI found this forum post also showing an LCD fix, but my problem seemed a bit different.https://www.eevblog.com/forum/repair/e4421b-restauration-project/I managed to fix it changing all ceramic capacitors of the LCD board. It seemed that more than one were shorting the bus intermittent.Capacitors were 1206 3.9u, 0805 100n across the horizontal COF drivers.Two capacitors near the connector seem to be connected to data lines, and if the value is not correct, the image will not show.The COF drivers seemed to be very well attached to the screen.`The unit is back into operation!
HP 3314A repair notes - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: June 14, 2019, 09:03:17 pm
content: Just had to repair a faithful HP 3314A. It was throwing E30, E31 and E34 errors on start up and during ranging. Looks like it was bad connections on the A1 board to the connectors going off of it, corrected by unhooking the ribbon cable, flex connector cable and signal connectors then extracting the board off the two connector that penetrate the board, J3 and J8. Errors went away on reassembly.Since there are a number of loops, DACs and 2 custom ICs U101 and U502, I went through and made some troubleshooting notes and waveforms. Note I set the O/P for triangle out at 1 kHz 1 V since the native waveform is a triangle.Note that the two troubleshooting flow charts are useful for more than CAL errors, the U101 DAC verification procedure works like a charm since the DACs two complimentary O/Ps are current waveforms, the verification is a simple way to test U101.

author: Eddy_D
author_rank: Newbie
timestamp: April 27, 2021, 01:01:53 am
content: I repaired an HP 3314A with similar issues, Err30 across all ranges.Found the same issue with flaky ribbon cables and replaced with home-made ones; this fixed the front display.The fix for the E30 issues was replacing a transistor in the SYNC circuit though, which tested good O_o ... it was Q403.If interested I made a youtube video of the repair.https://youtu.be/wNxgBubSfH8Now I am onto another 3314A with more problems... currently troubleshooting an E31 (consistently over-high frequency eg. 1KHz generates 1.4 KHz and the waveform is not 50% or linear (Iup != Idn) so I fear it may be U101 blown on that one...- Eddy
High voltage power supplies (over 1KV) - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: April 30, 2021, 12:59:02 pm
content: All-Other than 'just because' what is the usefulness of high voltage power supplies - over 1KV with a maximum current of 10 - 20mA or so, such as the PD 2K10 or 2K20 units? I have a Fluke 343A that I use quite often testing capacitor leakage as well as calibrating older meters - but I've never had a use for higher voltages than that as far as I can remember. Yet, I've refurbished and cal'd several of these and they always sell fast and for very good money, so *someone* out there is making use of them.TIA,Hal

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 30, 2021, 01:16:37 pm
content: I use Photomultiplier Tube and it does need high voltage low current power.

author: HalFoster
author_rank: Frequent Contributor
timestamp: April 30, 2021, 01:44:51 pm
content: A couple have gone to what I know to be companies and such - is that the case with you? I guess that I was wondering about what use it would be to someone in the hobbyist category; this all came about because I have one of the 2K20s at the moment that is in very good shape and very accurate - and I'm trying to decide whether to keep or sell. I have enoughjunkquality TE as it is and really need to have a use for what I keep.Hal

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 30, 2021, 02:51:38 pm
content: I use the PMT (photomultiplier tube) to measure very low level light for darkroom work. I think you should try to sell what you have. Although a good regulated power supply is ideal for what I do but I can't afford such a thing so I have to build my own which isn't very nice.

author: shakalnokturn
author_rank: Super Contributor
timestamp: May 01, 2021, 12:01:09 am
content: Evaluating ill-sourced discrete semiconductors for breakdown voltage.

author: PartialDischarge
author_rank: Super Contributor
timestamp: May 01, 2021, 04:21:40 am
content: The use of hv has many applications at least for me:Leakage testing, dielectric strength, powering Half H bridges with 3 or 4.5kV mosfets to create fast common modes (like 60kV/us or more), powering of dc-dc converters ( Converters with kV input and 5V output for example), testing of MOVs, spark gaps...

author: jh15
author_rank: Frequent Contributor
timestamp: May 01, 2021, 04:54:46 am
content: Connecting to garbage can to deter coons

author: _Wim_
author_rank: Super Contributor
timestamp: May 01, 2021, 06:33:06 am
content: For many of the uses above, a max current of 1mA is more than sufficient, but keeping the current below 1mA makes a power supply less dangerous, so for experimentation I prefer lower current outputs personally.This does however not mean that you should be careless when playing around with them. A 10kV/1mA power supply will still give someone a very big zap, you just have a better change of surviving it.
Tektronix DSA8200 help needed - Page 1
Forum section: electronics / testgear

author: 1audio
author_rank: Frequent Contributor
timestamp: April 26, 2021, 02:01:34 am
content: I have a Tek DSA8200 w/ 2 TDR modules. It was retired from service qualifying HDMI cables. The HDMI standards changed and now you need a 4 port VNA to test HDMI cables. In any case when I contacted Tek about getting the 80SJNB package they told me it was obsolete and I needed to get a DSA8300. The software would not work on the DSA8200 any more??? Once they figured out there was no unlimited checkbook at hand they moved on.At this point I would like to explore how to get the 80SJNB software package on this unit if its possible. Anyone with experiece dealing with this could probably give me some insights. Also about the Iconnect package which again was not available. How does software become no longer made??? To be sure I'm not ready to spend $$$ to get this all running on my obsolete hardware.Any advice? Or maybe I'll just sell it.
Buying new oscilloscope - Page 1
Forum section: electronics / testgear

author: renirski
author_rank: Newbie
timestamp: April 25, 2021, 06:12:04 pm
content: Hey! I am a newbie to this forumI browsed the forum but did not find a topic that would recommend an oscilloscope in the price range around 2000-2500 €.My question is which 4 channel oscilloscope do you recommend in this price range. Since I am building a new lab I want to buy a new oscilloscope that would upgrade the existing Rigol DS1102E oscilloscope.I’ve come across a lot of topics on oscilloscopes on the internet but mostly they recommend low cost scopes ... Since I’m buying an oscilloscope for the long term, I want to really make sure I buy a good scope before I buy.I use it in the design of switching power supplies, working with microcontrollers, data communications and a little bit of RF.Thanks for all the recommendations in advance!

author: tautech
author_rank: Super Contributor
timestamp: April 25, 2021, 07:32:08 pm
content: Welcome to the forum.For SMPS a DSO with Power Analysis will be useful to obtain high efficiencies.RF, a good FFT will be useful too.Have a look at the SDS2000X Plus range as it seems a good fit for your budget and needs.

author: Michael YYZ
author_rank: Regular Contributor
timestamp: April 26, 2021, 02:00:49 am
content: I’ve got a Siglent DSO from the 2000X Plus series recently and could not be happier. Excellent features for the price. Highly recommended!
Transistor Curve Tracer for Analog Discovery 2 - Page 1
Forum section: electronics / testgear

author: rstofer
author_rank: Super Contributor
timestamp: April 25, 2021, 10:09:02 am
content: Digilent released a new transistor curve tracer gadget for their Analog Discovery 2.https://store.digilentinc.com/transistor-tester-for-analog-discovery-enables-characteristic-curve-tracing-for-diodes-and-transistors/Attached is a set of curves for a 2N4401 (the first NPN I grabbed from my parts bin).This tool is going to take a bit of study. I haven't thought about transistors as a linear device in a very long time.

author: exe
author_rank: Unknown
timestamp: April 25, 2021, 11:10:51 am
content: That's cool! But I guess it can only test bjts with modest currents? The AD2 itself cannot supply much power, and I don't see a connector to hook it to an external power supply.

author: ace1903
author_rank: Regular Contributor
timestamp: April 25, 2021, 12:00:56 pm
content: Looked at this couple of days ago. But it was noted that is not available for sale.Did you make it yourself? In circuit diagram I saw some relay drivers that wasn't available at my distributor.Maybe circuit can be modified to use standard nmos fet like 2n7002 as a driver.

author: rstofer
author_rank: Super Contributor
timestamp: April 25, 2021, 03:19:56 pm
content: Quote from: exe on April 25, 2021, 11:10:51 amYou can provide external power to the AD2 but it is still limited. I doubt that it is of much use for other than small signal transistors. For a learning tool, it is still pretty useful.There are quite a few other plots and I spent a couple of hours just poking buttons.

author: rstofer
author_rank: Super Contributor
timestamp: April 25, 2021, 03:21:53 pm
content: Quote from: ace1903 on April 25, 2021, 12:00:56 pmNo, I just ordered it as soon as Digilent announced it. That was a couple of weeks ago.I see 414 in stock at the moment:https://store.digilentinc.com/transistor-tester-for-analog-discovery-enables-characteristic-curve-tracing-for-diodes-and-transistors/

author: rstofer
author_rank: Super Contributor
timestamp: April 25, 2021, 03:25:16 pm
content: w2aew makes a very sophisticated curve tracer:https://youtu.be/ZOLLoa2fH24and a simple one:https://youtu.be/WWY-pakm_OM
GTP-070B-4 probes - Page 1
Forum section: electronics / testgear

author: tatel
author_rank: Frequent Contributor
timestamp: April 25, 2021, 09:45:59 am
content: From Dave's video on rigol probes (#707, 3:18 et al) I draw the following conclusions:1- My 100 MHz doped device with the original 70 MHz probes could have a combined bandwidth of 57 MHz. Based on that calculation, a 100 MHz oscilloscope would need 350 MHz probes.2- Manufacturers (all of them, always?) usually provide probes with more bandwidth than officially declared so that the bandwidth of the complete system matches the oscilloscope specification. IIRC, this would be the case for at least some Siglent probes that are officially 100MHz but are actually >300, and it looks as if it would also be the case for the Rigol probes in that video. 150 MHz probes for a 50 MHz 'scopeWhat about GW Instek? They don't give 150 MHz-rated probes with their 50 MHz device, and I'm unable to find any info about the actual BW neither on this forum nor on GW Instek website.Probably there is no reason to worry. But, wouldn't it be nice should manufacturers just give the actual probe BW?What about probes that can be purchased separately? I mean, the bandwidth they specify is for real, or is also a "derated" specification? One would think that in some cases, it could be overrated instead.
Tektronix P6960 compression probe adapters missing spring contacts. - Page 1
Forum section: electronics / testgear

author: Shadowfire
author_rank: Contributor
timestamp: April 24, 2021, 01:18:48 pm
content: Just sharing the information.I purchased a pair of Tektronix P6960 spring-tip compression probes on Ebay, which were missing compression spring tips in the probe head.I got replacements and decided to see if it was even possible to repair the first pair of P6960's (I had no idea how they were constructed and suspected it would be .... difficult).As it turns out, it is possible, but requires a microscope, fine-pitched low force tweezers, and patience.These units don't use your traditional pogo pin/socket in their head. There are C-shaped springs in the compression head, which are installed such that the tips of the "C" are in the narrow part of the probe head channel (the PCB contacts the "top" of the C while the probe board contacts the "bottom" of the C.One of the first two P6960's had physical damage on the probe head (honestly looks like someone was pushing down on a knife). The other one had a single position spring missing.Using a fine pitched low force set of tweezers (I am sure that if you use the regular variety you will deform these springs, they are THAT small/thin), I was able to extract the C-springs from the ruined head and ultimately position one of them correctly and get it pushed down into the missing probe channel.I did lose 3 of the springs in the process, however, as they ARE springs and some of them ejected off of the microscope's platform while I was attempting to position and put them into place (never to be seen again).I haven't actually used the probes yet, but visual inspection of the probe head under a microscope shows that the spring dimensions seem to be exactly the same as the other springs, so its unlikely that I damaged it during insertion. Care is needed!
Solvent Resistant Micro Brushes - Page 1
Forum section: electronics / testgear

author: jjoonathan
author_rank: Frequent Contributor
timestamp: April 24, 2021, 07:59:26 pm
content: I have been using micro-applicators (see attached) to clean small adapters, between pins, and the like. They worked well but after a few years I worked through my supply and had to re-order. It looks like they are more available than ever before, but unfortunately the new ones don't appear to be resistant to isopropyl alcohol: once wet, they shed like a dog.Does anyone know of a brand/style that is compatible with IPA?

author: Zoli
author_rank: Frequent Contributor
timestamp: April 24, 2021, 11:43:52 pm
content: The relevant Digikey selectionhas a "Shred resistent" option in the "Features" column.My personal expeience is with the MG Chemicals 813 series(IPA and acetone), and if you use then carefully, the sticks tend to have a long life, and I was able to re-use a few between sessions, even multiple times.
Tektronix TDS 684A 1GHz signal bandwidth 5GS/s 4 ch color Oscilloscope  - Page 1
Forum section: electronics / testgear

author: lfsrouger
author_rank: Contributor
timestamp: May 05, 2021, 03:29:56 am
content: Excellent working and cosmetic condition: Tektronix TDS 684A 1GHz signal bandwidth 5GS/s 4 ch color OscilloscopeAny interest?Please view this video on calibration :
deleted - Page 1
Forum section: electronics / testgear

author: PeDre
author_rank: Contributor
timestamp: April 24, 2021, 02:56:52 pm
content: .

author: tv84
author_rank: Super Contributor
timestamp: April 24, 2021, 03:38:38 pm
content: Have you tried something like this?:SYST:SET #9000000512\14\BB\B2\5D\E0\EC\87\1F\D6\9D\FC\38... \n

author: tv84
author_rank: Super Contributor
timestamp: April 24, 2021, 04:50:20 pm
content: Peter,But the problem is submitting contents, not retrieving.BTW, please attach the "*LRN?" output.

author: YetAnotherTechie
author_rank: Regular Contributor
timestamp: April 24, 2021, 09:33:41 pm
content: Have you tried to send only a subset of parameters? Maybe there's a specific point were it fails....
Which DMM first used OL instead of a 1 for over range (over load)? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 23, 2021, 11:38:31 am
content: Which DMM and when did DMM manufacturers changed from a 1 in the left most digit to indicate over range to OL?

author: Fungus
author_rank: Super Contributor
timestamp: April 23, 2021, 11:59:03 am
content: My Fluke 8060A says OL, that's the oldest I've got.

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 23, 2021, 12:23:06 pm
content: Wow! Thanks. I am kind of surprised too because I was thinking only autoranging DMM uses OL. I was wrong.
Siglent BUG & Fixing time scale - Page 1
Forum section: electronics / testgear

author: hpw
author_rank: Frequent Contributor
timestamp: April 22, 2021, 07:36:52 pm
content: What is the average bug fixing time & schedule for Siglent gear... also how they communication to and with the customer?Any priority incident handling or known about? Or even direct dealing with the China landHp

author: tv84
author_rank: Super Contributor
timestamp: April 22, 2021, 07:44:49 pm
content: There is no time schedule.

author: tautech
author_rank: Super Contributor
timestamp: April 22, 2021, 08:04:34 pm
content: Quote from: hpw on April 22, 2021, 07:36:52 pmMake contact with your local Siglent office and provide full details of any suspected bug like what it is and what you expect and always include the firmware version.The exact steps to replicate any bug is very important.When you get an email reply you can send full reports and supporting screenshots.

author: 2N3055
author_rank: Super Contributor
timestamp: April 22, 2021, 08:39:07 pm
content: Quote from: hpw on April 22, 2021, 07:36:52 pmLet me ask you in return: What is average bug fix time and schedule for R&S, Keysight or Tektronix ??What do you mean by "priority incident handling" ? T&M is not life support or mission critical, at least not usually.Production testing comes to mind as a use that would need some type of guaranteed uptime... Even then you would want to have redundant test stations, you cannot rely on SLA only, even if they guarantee repair time in hours. Uptime guarantee is customer responsibility... Vendor can only help design it..

author: SMB784
author_rank: Frequent Contributor
timestamp: April 22, 2021, 10:01:27 pm
content: Quote from: hpw on April 22, 2021, 07:36:52 pmThat depends on the bug.Some bugs are major and they fix them quickly, within a few weeks or months.Others are minor, and they get to them when they get to them, could take many months.Others they don't really consider to be bugs but more like value subtracted features, so they never get fixed. This is the same story across most T&M equipment companies, and Siglent is no exception.
FTP410 - Page 1
Forum section: electronics / testgear

author: iRGUY
author_rank: Newbie
timestamp: April 22, 2021, 06:46:38 pm
content: Trying to find out why i cannot see the tX outputs or CLK signals from the chip on my digital scope when the chip is connected to a monitor thru an HDMI port. I only see 1.8 high levels on each output due probably to the pull-up resistors from the monitor. I tried observing these same outputs from a Gumstix Summit board connected to a display the same way and it had a picture on it but again all I could see when I monitor the lines are 1.8V levels. How can I view the signals?
ADVANTEST R3361 EXTERNAL REFERENCE QUESTION - Page 1
Forum section: electronics / testgear

author: stavros92
author_rank: Newbie
timestamp: May 07, 2020, 08:34:02 pm
content: Hi allI have a r3361 advantest spectrum analyzer and want to feed it with an external 10 MHZ reference signal through it's rear panel input.There is a switch selecting if the bnc connector will be inputing or outputing the 10 mhz reference but I cannot see a menu selection to enable or disable the external reference modeIf switch is at the "external input" and my 10 mhz signal is missing there is not any "UNLOCK" indication so I can be sure if it works ok....Does it automatically reverts to the internal reference if external is missing? Am i missing something?ThanksStavros

author: Armando1989
author_rank: Contributor
timestamp: April 22, 2021, 06:21:01 pm
content: HelloI have r3465, it select via soft menu, i use gpsdo as external 10MHz reference when i want, if external reference is not present YES i see the signal under measure moves away :scared:from where it should be until i select MANUALLY the internal or just plug again the external. No unlock indication notice whatsoever but i think you need to make sure u have your reference working, otherwise at least mine is not smart to detect lose of reference signal input...Br
M644 Component Tester - Page 1
Forum section: electronics / testgear

author: ko4nrbs
author_rank: Regular Contributor
timestamp: April 22, 2021, 11:09:55 pm
content: Anyone added leads to their M644? I'd like to use leads with alligator clips so I can test components taken out of equipment. Concerned about adding errors if I do it. The components leads are too short after being unsoldered for the M644.Bill

author: wasyoungonce
author_rank: Frequent Contributor
timestamp: April 22, 2021, 11:22:55 pm
content: Best to Ask Question in this thread...its long and all things transistor tester (M tester)https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/6875/But yes there are many versions and some use leads
Siglent 1202x-e scope question? - Page 1
Forum section: electronics / testgear

author: 1966
author_rank: Newbie
timestamp: February 08, 2021, 10:35:00 pm
content: Just curious but does anyone know if Siglent has upgraded their firmware for this unit? I am thinking of purchasing a newer scope and have been reading prior post about this unit but most post seem to be around three years ago so looking for some updated info. Thanks.1966

author: kcbrown
author_rank: Frequent Contributor
timestamp: February 08, 2021, 11:19:55 pm
content: Latest available firmware for that scope appears to be version 1.3.26, dated July 4, 2019:https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1202X-E_1.3.26_EN.zipYou can generally find firmware, manuals, etc. directly on Siglent's website (https://www.siglent.com).

author: werediver
author_rank: Contributor
timestamp: April 22, 2021, 07:13:06 am
content: I have received my SDS1202X-E yesterday and it's on 1.3.26, which appears to be the latest firmware for this device (as already mentioned by @kcbrown).I believe this model received multiple updates since it's release, I remember reading about it on this forum while researching which scope to choose.Still, 1.3.26 is almost two years old by now. Would be nice to receive another update... (I don't believe there is nothing to fix or improve anymore). Why don't they make the firmware open-source?