hybridfree/eevblog-posts huggingface dataset:
RD6006P problem or firmware bug? - Page 1
Forum section: electronics / testgear

author: ptluis
author_rank: Frequent Contributor
timestamp: April 19, 2021, 11:13:03 am
content: I found this video on youtube about a strange behavior of the RD6006p unit, could this be a problem with that unit or a firmware bug?

author: dougg
author_rank: Regular Contributor
timestamp: April 19, 2021, 02:45:47 pm
content: I'm not good at charades. Could you explain briefly what is the issue that video is trying to demonstrate? I have a 6006P and may be able to replicate.

author: radiolistener
author_rank: Super Contributor
timestamp: April 19, 2021, 05:37:08 pm
content: Quote from: ptluis on April 19, 2021, 11:13:03 amI don't see any PSU bug here.According to the video, the user testing his motherboard device or something like that.The voltage is set to 19 V.When the current limit is set to 3 Amps and below that, the device don't want to power on.When the current limit is set to 3.5 Amps and above that, the device power on ok.There is no testing for current limit between 3 and 3.5 Amps on the video.At a glance, the user's device board is just designed in such way to not power on when PSU cannot keep 19 V with at least 3.5 Amps at startup time.PS: I don't understand what is the reason to test 2 Amps, 3.6 Amps, 4 Amps, 5 Amps, etc. Because two measurement for 3 Amps and 3.5 Amps is enough to predict behavior for current limits below and above that values.

author: ptluis
author_rank: Frequent Contributor
timestamp: April 21, 2021, 03:54:10 pm
content: Quote from: radiolistener on April 19, 2021, 05:37:08 pmThis makes sense, I tried to replicate the same behavior with several toshiba laptop motherboards, but I couldn't, maybe that's the reason.what caught my attention, was the fact that the current limited to 3A did not start the MB regulation. I normally use 3A as a current limit on all my PSU's, but I never had a problem like that. Well, always learning something new.
Using a modified Peacefair PZEM-004T module as cheap mains data-logger  - Page 1
Forum section: electronics / testgear

author: theHWcave
author_rank: Regular Contributor
timestamp: April 21, 2021, 11:00:17 am
content: The Peacefair PZEM-004T (about 12 US$) module measures AC mains voltage, current, active power, frequency, energy and power factor. It has a serial interface (TTL level, 9600bps,8 data bits,1 stop) using a Modbus like protocol. There is no display itself. The module is powered from mains (80V onward) and can be bought with either a current shunt for up to 10A current range, or a current transformer for up to 100A. I got the version with the current transformer. The module is often used for energy monitoring projects but I wanted to use it for general measuring and data logging of AC (mains)-powered devices, and I wanted it to measure from 0 volts onward. The modification is fairly easy to do and I went a bit further and changed the way the module is powered by using an isolated (!) DC-2-DC converter to get the operating power directly from the serial interface. I must stress that an isolated DC-2-DC converter is needed here because the measurement circuit based on the VANGO V9881D is directly connected to mains.I build a little box that contains the module, the current transformer and a switch that runs the to-be-measured current either straight through the current transformer (x1 mode) or through 10 turns (x10 mode). The x10 mode boosts the reading accuracy for low currents but when in use, you need to divide the measured current (and power) by 10 to get the correct values. Basically you get one extra digit of resolution that way. Of course in x10 mode, the maximum current is now only 10A not 100A.The accuracy of my modified module was:voltage: 0.5%current: 1.2% in x10 mode, 1.5% in x1 mode (it improves slightly with more current)frequency: 0.1% (45 to 65 Hz, but it measures > 1kHz with less accuracy)power factor: hard to quantify but in general close to other methods I used to compare it with (other power meters, and oscilloscope)My software samples the data every 0.5 seconds, displays it and saves it in a spreadsheetMy reverse-engineered schematics of the original module are attached as well as the schematics of the modification. I wrote a little Python program (runs under Linux and Windows) to display and record the values in a CSV file for spreadsheet analysis and plotting. You can download it free here:https://github.com/TheHWcave/Peacefair-PZEM-004T-Details of the tear-down, the modification and accuracy tests are also in these YouTube videos:https://youtu.be/qRsjsenvlJAhttps://youtu.be/j0_y8dPfpKc
Tenma Oscilloscope Manuals - Page 1
Forum section: electronics / testgear

author: tyguy2
author_rank: Unknown
timestamp: July 20, 2015, 07:32:23 pm
content: I've recently found a Tenma 72-740 oscilloscope that I'm thinking about purchasing, but I want to learn a few things about it before I get it. The problem is that I can't find a manual for it (probably because I don't know any good manual archives). Does anyone know where I could get the manual? (Or maybe a website to look for it at?) Thanks

author: elliott
author_rank: Regular Contributor
timestamp: July 20, 2015, 08:43:54 pm
content: Is it this one?It sure looks a lot like a Philips scope, maybe a PM3209.Not terribly helpful as I can't seem to find a free manual for it either.

author: tyguy2
author_rank: Unknown
timestamp: July 20, 2015, 08:46:31 pm
content: That's quite odd. Especially since that's the pic from the eBay auction.

author: elliott
author_rank: Regular Contributor
timestamp: July 20, 2015, 08:56:20 pm
content: That was the first one to come up when I searched for it.I'd stay away personally just because they said they don't have a power cable that fits it, but they assume it works. Everyone has at least one IEC power cable laying around. I wouldn't consider it worth the cost of shipping without seeing it power on.

author: tyguy2
author_rank: Unknown
timestamp: July 20, 2015, 08:57:52 pm
content: Alright, back to searching then. Thanks for the advice.

author: trueblue2k2
author_rank: Newbie
timestamp: April 21, 2021, 06:20:59 am
content: This is a 40Mhz Hung Chang 5504 that may be re-branded as a Beckman Industries 9104 or Protek 5504; or else with black faceplate as a Philips PM-3209 or Tenma 72-740. HC is also made in in 20, 60, and 100 Mhz versions. See my other post under "Hung Chang 5504" for support info.
IFR 1200 Super S - Page 1
Forum section: electronics / testgear

author: jlmoon
author_rank: Unknown
timestamp: January 14, 2021, 02:42:43 am
content: Hello All,I am looking for a IFR 1200 Super S service manual. Does anyone know where I might pick one up? Apparently the 1200 Super S is kind of rare for I have not been able to locate much information. I am trying to service the cpu board, looks like either the E^2 eeprom has lost it's data or possibly the static ram has failed. Reason I state this is that I have already checked the Eprom and it will run in my good Super S. I would also like to know where the options are stored, so as to back that part up before I loose that valuable data. Would be nice to have at least a schematic or parts of one so as to help in solving these issues. One more note, when I first started working on this box, the cpu had no activity on any of the pins except for the 16 Mhz crystal was running. No clock out on pin 56 of the 80C188 cpu. I replaced the cpu and now I have clock out, address and data lines wiggling as they should. Another part that could be bad (hoping not!) is the GAL16V8B 25LP programmable array logic. There is hope, I know there is....Thanks in advanceJon

author: try2fix
author_rank: Contributor
timestamp: April 20, 2021, 06:24:31 pm
content: Hi, I have simular problem but I don't have anouther supper s to compair - I do have 1200s but the cpu board is different - I have have changed most chips with still no sucsses. does your good 1200 super s do this: ""On the Super S you just pull up the runtime clock (Intensity,decimal point twice rapidly) and enter the minutes and hours backwards.It will bring up an OPTION SET XX flag,just enter the config you want. 00 is none,01 tracking,02 trunking,03 both-it proceeds by making a two digit hex number out of a bytewhere you set certain bits. It will then say CYCLE POWER. After turning the unit on and off a couple of times it will work normally""" -- I have read this and if it works that means that there is some NVRAM on the CPU board that may be corrupted - maybe that is what is happing for you and mine
DSLogic EEPROM: anyone successfully read ST M24128? - Page 1
Forum section: electronics / testgear

author: amaschas
author_rank: Regular Contributor
timestamp: April 22, 2021, 01:08:41 am
content: Hey all, I've been trying to upgrade a DSLogic basic by modifying the EEPROM, but I'm pretty much banging my head against the wall with the ST M24128 device that comes on the DSLogic board I have. I've had no luck with a CH341A. I also tried using an Arduino to read from the thing directly over I2C, but I got nothing. I'm hoping someone on here has encountered this particular component and has a working strategy for reading and writing to it.

author: TK
author_rank: Super Contributor
timestamp: April 22, 2021, 01:20:13 am
content: Quote from: amaschas on April 22, 2021, 01:08:41 amDid you unsoldered it from the PCB? Can you post the Arduino sketch you used to read the memory?

author: pgo
author_rank: Regular Contributor
timestamp: April 22, 2021, 01:41:59 am
content: There is some discussion here that may be useful.https://www.eevblog.com/forum/testgear/upgrading-dslogic-basic-to-plus-without-eeprom-modification/msg2594313/#msg2594313bye

author: amaschas
author_rank: Regular Contributor
timestamp: April 22, 2021, 03:30:10 am
content: Quote from: TK on April 22, 2021, 01:20:13 amYep, I actually tried to read it in-place, but that failed so I desoldered it. I used the sketch from this tutorial, since the EEPROM in question has an I2C interface:https://learn.sparkfun.com/tutorials/reading-and-writing-serial-eeproms/allQuote from: pgo on April 22, 2021, 01:41:59 amThanks! I'll take a look at that.

author: goaty
author_rank: Regular Contributor
timestamp: April 22, 2021, 07:59:22 am
content: I have just swapped the firmware in sigrok/pulseview to use not Basic firmware but wassitcalled Pro or Plus or so, to get the full record length after I soldered the memory.
Wandel & Goltermann SPM 33 Repair - Service Manual - Page 1
Forum section: electronics / testgear

author: maurit
author_rank: Contributor
timestamp: April 19, 2021, 01:36:04 pm
content: Hello everyone,I have 2 beautiful W&G SPM 33 but unfortunately both, after the power test,they see me "error 1111" and "error 1121".I have not found any documentation regarding these errors.Is there anyone who can help me with the service manual?Thanks a lot.maurizio
Fastest Programmable Pulse Current Source - Page 1
Forum section: electronics / testgear

author: Pluscrafter
author_rank: Regular Contributor
timestamp: April 19, 2021, 12:12:52 pm
content: I have an Programmable Pulse Current Source here but there is no manual, also i cant find anything in the Internet and the company appears to be bankrupt since 1995. Maybe this is an rebranded model or so . It would be nice someone knows something about this device or has an manual for it.
looking for information about  SERVOGOR 340 - Page 1
Forum section: electronics / testgear

author: Joaquin
author_rank: Newbie
timestamp: April 19, 2021, 10:22:41 am
content: Greetings :I am looking for information on a recording equipment.The equipment is aSiemens Oscilloreg C1724with three718modules, it has capacity for four, but there are only three installed.This team also has other references such as:Goerz's ABB Metrawatt Servogor 340orNGI Servogor 340.I am especially interested in knowing the characteristics of the718,C1724 8BA,C17248BBandC1724BDmodules.I will greatly appreciate any information.
Hantek DSO5102B fail - Page 1
Forum section: electronics / testgear

author: Arrow_85
author_rank: Newbie
timestamp: May 29, 2014, 08:21:25 pm
content: Hello,Please have a look on this movie which shows my problem:http://youtu.be/zgk9_GFzalcWhat can be the problem here?Power supply?Please help!Br,Arrow

author: FrankenPC
author_rank: Unknown
timestamp: May 29, 2014, 08:24:21 pm
content: Maybe a power rail is sagging? Bad regulator?

author: Arrow_85
author_rank: Newbie
timestamp: May 29, 2014, 08:46:13 pm
content: Hard to say... I have possibility to buy such oscilloscope...If its power supply it should be easy to fix, but I afraid it is something more...What to do?

author: madshaman
author_rank: Frequent Contributor
timestamp: May 29, 2014, 08:55:51 pm
content: My guess is similar, it looks like something is drawing all the current as the thing tries to start.My best guess is either a simple short on the board or some diode blown to conduction, or some dead electrolytics (which may be the result or cause of the damage).It does kind of look like a short to me.

author: tinhead
author_rank: Super Contributor
timestamp: May 29, 2014, 09:19:49 pm
content: Quote from: Arrow_85 on May 29, 2014, 08:21:25 pmmaybe, but maybe only connector from power supply to main PCB.But hey, i've made and posted schematic of these DSOs, just check schematic links in first posting in that huge threadhttps://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/or directly herehttp://www.mikrocontroller.net/articles/Datei:Hantek_Tekway_DSO_MSO_hw1007.pdfor herehttp://1drv.ms/1hf4SgOi don't know your SN nor HW version, but the power supply design has been not change since Dec 2009,so hw1007 schematic might help you for sure.

author: seronday
author_rank: Regular Contributor
timestamp: May 29, 2014, 11:24:16 pm
content: Some months ago I repaired a DSO5102B which showed similar symptoms.In my case the problem was caused by a faulty diode, VD4, in the power supply voltage control circuit.I have added a note on the attached power supply circuit drawn by Tinhead.Good Luck.

author: Adagio
author_rank: Newbie
timestamp: February 21, 2018, 04:17:01 pm
content: Ho. Lee. Crap.This is the oscilloscope I have...Like. The same one.(Not the same make and model. The specific one. I didn't know he posted this here... Weird turn of events.)I know those arms of my friend anywhere! XDSo I'll just pick up where he left off.So. I changed out the Schottky diode. And a load of other diodes too. Replaced the capacitors. Some of the transistors.(Some were hard to find)I'm considering just using the specs (Gratiously provided by the complete schematics by tinhead.) and just making my own PSU for it.Some buck converters and a 12V PSU should do the trick?Worried about the AC50 pin, which seems to be a 50Hz signal. And the +-9V Split supply...Any advice?

author: tancioste1
author_rank: Newbie
timestamp: April 19, 2021, 07:38:02 am
content: Hi all,My Hantek DSO5102B failed to start because of a PSU problem.Thanks to the PSU schematic you shared I was able to identify and replace the faulty components.In my case I had to replace C8 and R8.thank you!
TDS600 series GPIB FILES:READ FILES:WRITE - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: April 19, 2021, 03:58:25 am
content: Is there a way to copy files from the TDS600 series trough GPIB ? I tried all of these FILES:READ but as said in the manual 500 and 700 series support only ...FILES:DIR?"APP","OSSA.BAT","STARTUP.BAT","TDSPRT1.APP","WFMS","TDSJIT1.APP","TEK00003.PCX","429VCCQ1.PCX","TEK00004.PCX","TDSJITV2.APP","D0_LOW01.WFM","STB_01.WFM","D0R_TG02.WFM","STB_02.WFM"FILES:READ "hd0:OSSA.BAT"FILES:READ "hd0:/OSSA.BAT"FILES:READ? "hd0:/OSSA.BAT"I also tried toFILES:CWD "hd0:"FILES:PRINT "OSSA.BAT",GPIBThis somewhat works, but I end up with no response. I then need to reset the TDS694C to get the files out again...
Looking for the FSH-Z1 power sensor 7-pin connector to the FSH spectrum analyzer - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: April 15, 2021, 08:45:57 pm
content: Hello,The 7-pin male connector of the FSH-Z1 power sensor has all the pins chopped out and I am looking for a replacement , any clues where to find that?ThanksGeorge

author: VRCW
author_rank: Newbie
timestamp: April 17, 2021, 04:37:44 pm
content: Binder 712 connector
Logic analyzer to make a board - Page 1
Forum section: electronics / testgear

author: amadeok
author_rank: Contributor
timestamp: April 15, 2021, 07:44:05 am
content: HelloI was thinking on trying to design a custom pcb controller board to drive eink displays based on other projects i've seen. That would probably also involve programming fpgas, and devices such as the lt1945 , diodes, ect . Something similar to thishttps://github.com/vroland/epdiy/blob/master/hardware/epaper-breakout/schematic.pdfI'm on a tight budget and i need something that can handle at least 60mhz, they are selling la1016 logic analyzers on aliexpress for 50€ but i couldn't find any oscilloscope at that price that can actually handle that frequency.So i was wondering if a logic analyzer makes sense for this or if an oscilloscope would be a must.thanks

author: DiTBho
author_rank: Super Contributor
timestamp: April 15, 2021, 09:12:17 am
content: Quote from: amadeok on April 15, 2021, 07:44:05 amI am afraid they don't match, however I have aZeroplus LAP-C 16032logic analyser, it's a 16 channels @ 100 MSa/s LA, the bandwidth is 100Mhz, using 16 channels works up to 10Mhz which is ok for my 1Mhz digital signals (SPI + glue logic, but also a couple of 8 parallel bus devices), paid 100 euro for it, it's not too bad.I haven't hacked it yet, I don't know if it also works on Linux somehow, I don't know about its USB protocol, I am using its program on a Windows laptop, it works just fine.

author: KrudyZ
author_rank: Frequent Contributor
timestamp: April 16, 2021, 04:22:19 pm
content: If you will be using an FPGA then you can skip the logic analyzer as you can add it internally. In any case logic errors can and should be caught in simulation rather than in hardware.For external stuff a scope is MUCH more useful. However to catch the tough problems, which for digital design are signal and power integrity, you would need a much faster scope than your clock frequency.If the design is not complex with clean wiring and ground returns, then you might just need a meter to check for opens and shorts.I suggest to simply get started with the FPGA design, since you can do this without shelling out any money by running the free tools and simulation.
Solartron/Schlumberger a213 voltmeter manual - Page 1
Forum section: electronics / testgear

author: sahko123
author_rank: Frequent Contributor
timestamp: April 16, 2021, 12:54:46 pm
content: Does anyone have access to a Solartron a213 or a210 series manual? Digitized or hardcopy. I'm looking to buy one and want to know if the manual is even available. From searching ive found one guy online who seems to be selling it on an "email me" basis but none otherwise.
Rohde & Schwarz CMS 50/52/54/57 amd CMD , "grey" and  "green" screen. - Page 1
Forum section: electronics / testgear

author: ytterligare
author_rank: Regular Contributor
timestamp: April 15, 2021, 09:22:03 pm
content: Someone told me that the devices in the subject come with different type of screen depending on the manufacturing date : "greyish" one and greenish" and that the "grey" ones are more prone to break than the other.Anyone has knowledge of this or is it only a myth ?Thanx
Vintage Phillips Oscilloscope model TA155 Made in Australia - Page 1
Forum section: electronics / testgear

author: CoffsHackerSpace
author_rank: Contributor
timestamp: April 19, 2021, 11:40:10 am
content: Hey AllToday in a barn find i score 5 oscilloscopes. Trio 10mhz 2ch, 2x BMD 539 a,d and manconi oscilloscope 101 (dont know much about it either)This Phillips branded made in oscilloscope Model TA155this one below has me puzzled and want to know more about it and maybe even do a full reso on it.

author: CoffsHackerSpace
author_rank: Contributor
timestamp: April 19, 2021, 01:04:23 pm
content: Corrected Model number It is a TA 155 cira 1949Just found this its for one built in 1952http://www.tuberadio.com/robinson/Manuals/TA155.pdf
HELP Fluke 8010a AC overrange - Page 1
Forum section: electronics / testgear

author: HendoNZ
author_rank: Contributor
timestamp: April 14, 2021, 07:58:58 am
content: Hi all,I recently got a Fluke 8010a multimeter but it seems that the AC function seems to be reading Over range all the time. I've tried different voltages, but still the same reading.Anyone got any ideas to look at when I pop the lid on this one?CheersModify message

author: HendoNZ
author_rank: Contributor
timestamp: April 14, 2021, 09:08:33 pm
content: Ok, after some digging around I've got some questions. I was checking the op amp AR1 (LF351n) and here are the voltages on the pins. 1. -13v 2. 0v 3. 0v 4. -13v 5. -13v 6. 0v 7. 0v 8. +13v. The Va should be +15v +-1v (I know it's.on the low side. Also, U8 pin one is supposed to be 4.3v (if I'm reading it right) it's 13v.Any help would be appreciated.

author: BobRyan
author_rank: Contributor
timestamp: April 14, 2021, 11:29:32 pm
content: You report pin 7 of AR1 is 0v. Is this with S4 in AC mode? If so it looks like S4E isn't properly switching +VA which powers U8 and (partially) AR1. I would check TP10 for the +15v+-1v as specified. If that's not 0 it's likely you just need to clean/cycle your switches.I've had four 8050A and an 8010M in use for several years and all of them have needed some switch cleaning. Deoxit D5 has worked well for me.

author: HendoNZ
author_rank: Contributor
timestamp: April 15, 2021, 07:07:36 am
content: Thanks for the reply.Yeah the AC switch was engaged. Looks like that was only a small problem. I've now got voltage to pin 7. Still no joy on a reading though.I've tracked an AC single into U8 using a scope, and followed it around the board. Unfortunately there are no schematics for that board so I don't know what I'm looking for.I think I might be stuffed for AC unless I can find a replacement U8 board. If anyone out there might be able to donate one - that would be amazing.If anyone is interested the chips on the board are (from right to left) are LF351n, 7849, CA3049 and a LF351n.Cheers

author: BobRyan
author_rank: Contributor
timestamp: April 15, 2021, 03:11:28 pm
content: Have you checked DC coming out of U8? I'd poke around R18/R19/R21.
MK-168 transistor tester/ESR meter question  - Page 1
Forum section: electronics / testgear

author: g.costanza
author_rank: Contributor
timestamp: April 14, 2021, 06:07:36 am
content: When measuring a used 50v 33uf electrolytic capacitor that was removed from a circuit, why would this meter only display a capacitance reading and no ESR reading? I'm doing a recap project and it only showed capacitance on all three of the caps. It didn't show an esr reading at all. I measured several NEW caps I have that are close to those used caps in size/capacitance and the meter DID show ESR readings on those caps. Any ideas? Thanks!

author: indman
author_rank: Super Contributor
timestamp: April 14, 2021, 06:29:00 am
content: The forum already has a global topic on the discussion of various clones of this device.https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/
Channel out on BK 9130 power supply - Page 1
Forum section: electronics / testgear

author: HooRide
author_rank: Regular Contributor
timestamp: June 18, 2013, 09:35:44 pm
content: So, like the title says, a channel went out on my BK Precision 9130 power supply. I have over a year left on the 3 year warranty but...during the RMA setup process, I saw that out of warranty repair for this $900 supply was $320 + $20 shipping.This seems really overpriced to me and I'm second guessing buying another BK piece because of it.The supply itself has never been abused and used only moderately.What do you all think? Ever have to send in your test equipment in for repairs?*edit*I forgot to ask, anyone have access to service manuals or schematics for BK Precision test gear?

author: HooRide
author_rank: Regular Contributor
timestamp: July 15, 2013, 10:34:34 pm
content: Well....I got the unit back. The repair order says all the tech did was reflow the solder to a binding post on channel 1.That's the good news, the bad news is there is a now a strange problem. It seems like the output on channel 1 is off by +0.012V.With channel 1 set to 0.000V and the output turned on, the unit itself shows 0.012V, my DMM shows about 0.097V and the E-load shows 0.01V and can draw 180mA or so.Channels 2 and 3 do not exhibit this phenomenon.Suggestions?Channel 1Channel 2

author: seamusdemora
author_rank: Regular Contributor
timestamp: April 14, 2021, 06:11:33 am
content: Hello - hope you got your issues sorted out. I came across this while searching for "BK precision 9130 channel 1 output". There is no way I'm spending money on this thing, but I would like to repair it. I wondered if you might have any advice along those lines.The issue is weird: Ch 2 & Ch 3 work fine. Ch 1 does not seem to accept a value in SET mode - it retains the value I set, but I never get any output. And then it reverts to "OFF" after a few seconds. I don't like the interface, but I'm trying to set Ch 1 the same way I set Ch 2 &3. Been through the "Menu" which says "NO FAULTS", and tried to verify there's nothing programmed that would override my settings.Any thoughts appreciated.
HP 54200A hardware failure - Page 1
Forum section: electronics / testgear

author: epitaxial
author_rank: Contributor
timestamp: April 20, 2021, 03:02:03 pm
content: My HP 54200A has intermittently started to display a hardware failure error on power up. The built in diagnostics report no problems so I decided to read through the calibration and repair document. The entire document is all about the CRT and nothing more. I wondered if maybe an internal battery was starting to fail. There is absolutely no mention of a battery anywhere in any related document or google search. Finially I watched a tear down video and there actually is a battery soldered to one of the boards. It's some oddball 3.9v lithium battery and a replacement is $40! Does this sound like a battery failure or something else?*quick editIt now fails on power up every time and also fails every trigger/input test. Given the gradual decline and massive fail I'm going to look at the power supply caps.
Can you Identify this Diode? - Page 1
Forum section: electronics / testgear

author: Lost Electron
author_rank: Newbie
timestamp: April 12, 2021, 11:03:04 pm
content: Hello everyone,I am repairing a HP4263A LCR meter which has burned input protection diodes. I searched the number on these diodes but I was not successful in finding definitive information.The number on the diode is: T771-HI attached a drawing of the diode with the numbers as they appear on the diode. This diode might be a BYT77 but I am not sure. Your help is greatly appreciated. Thanks!

author: IAmBack
author_rank: Regular Contributor
timestamp: April 13, 2021, 06:33:06 am
content: Maybe it is hv-t77 diode?
EIP 545B Frequency Counter TCXO Adjustment? - Page 1
Forum section: electronics / testgear

author: E63S4Me
author_rank: Contributor
timestamp: April 10, 2021, 06:09:07 pm
content: Hi,I recently acquired an EIP 545B frequency counter. The unit checks out fine but is a little off frequency when compared to my Rubidium standard. Varies between +4.1 Hz and 5.5 Hz or so over the course of a day.Looking at the manuals I've downloaded the instructions say to adjust the TCXO, but from the various drawings I'm not quite sure where the TCXO is.I have a pretty good idea but before I go tweaking anything it would be nice to have some confirmation.

author: Tjuurko
author_rank: Regular Contributor
timestamp: April 12, 2021, 09:52:26 am
content: Most likely here:

author: E63S4Me
author_rank: Contributor
timestamp: April 12, 2021, 06:17:55 pm
content: Thanks!That was the pot that I guessed as well. I will note the initial position and then give it a tweak. If that doesn't do the trick I'll just return it to the original position.
mastech ms8040 vs M9803R  - Page 1
Forum section: electronics / testgear

author: DiTBho
author_rank: Super Contributor
timestamp: April 12, 2021, 10:51:22 pm
content: I am a bit confused, M9840 and M9803R look the same, or very similar, just in different color.I also wonder if the RS232 protocol is the same or different.

author: DiTBho
author_rank: Super Contributor
timestamp: April 12, 2021, 10:55:04 pm
content: Quote
Tektronix T922 Mysterious Triggering Issue - Page 1
Forum section: electronics / testgear

author: Smauel
author_rank: Contributor
timestamp: April 12, 2021, 03:51:52 pm
content: I need a little bit of troubleshooting help.I recently acquired an old Tektronix T922 analog scope. It seemed to be in fine working condition (besides some external damage in shipping, which I was able to get a refund for, and then repair to a certain degree).The scope seemed to trigger normally, or at least well enough, on most signals (I don't have a signal generator, but there is a test signal built into the scope, and I built a small circuit with a 556 timer to help test when I realized something was acting up.)However, when I made a second order active low pass filter to turn the square wave from the 556 into a sine wave, the triggering started really acting up, on that signal source especially, and even more strangely, the more the potentiometer for the filter is turned (adding more series resistance into the input of the filter, filtering more high frequency out), the more it acts strange.I've linked some videos of the weirdness. Firstly, the region in which I can turn the trigger level and still get a stable trigger seems narrower than it should be. Not only that, but when I turn the trigger level, it is clearly changing something about the triggering, but I don't think its the trigger level, as the display does not move with the trigger level. This is reinforced by the fact that pressing the slope switch does not seem to change anything.https://photos.app.goo.gl/u8sVKzDo2Eq8g7mn7https://photos.app.goo.gl/F8mwiigAFQ8rjpoC8Changing the trigger settings have the result that it either triggers "normally" (a stable trigger, but the level where it triggers at is very binary, at either the very top or the very bottom, no in-between), or it triggers twice roughly 180 degrees out of phase with itself making two signals that slide around, or it triggers automatically at preset time intervals, making a chaotic display.I can't make much sense of what I'm observing. One observation that is halfway a guess is that it seems to only trigger at or near the extrema of the signal, if at all, but I don't know what that means.Please tell me if you have ever witnessed anything like this, so I can see about figuring out what is causing it to try and fix it.Thanks in advance for any help you can offer!

author: StillTrying
author_rank: Super Contributor
timestamp: April 12, 2021, 05:09:20 pm
content: Have you got the X variable speed on the Cal position, - not an expanded X speed.And then move the X position to the right so that you can always see the start of the trace and the actual first edge it's triggering on.If there is enough noise about it's quite common for edge trigger to trigger on the wrong edge randomly.

author: Smauel
author_rank: Contributor
timestamp: April 12, 2021, 07:04:52 pm
content: Yes, it is in the x1 position, not expanded. I don't think it's random noise either, because despite not functioning as expected, it is still relatively consistent. Also the voltage I'm inputting should be plenty to overcome random noise.
Kingst LA1016  - Page 1
Forum section: electronics / testgear

author: amadeok
author_rank: Contributor
timestamp: April 12, 2021, 01:30:32 pm
content: HelloCould someone tell me if you tested the Kingst LA1016 logic analyzer, can it really handle 100mhz?thanks

author: voltsandjolts
author_rank: Unknown
timestamp: April 12, 2021, 01:59:58 pm
content: No, but I have tested an LA2016 at over 100MHz and it works fine.LA1016 uses the same hardware as LA2016 so I strongly suspect it will be fine at 100MHz (sampling speed, so input signals need to be less).
Siglent SDS 1104X-E interesting view - Page 1
Forum section: electronics / testgear

author: xenoxaos
author_rank: Contributor
timestamp: April 12, 2021, 05:25:22 am
content: So, I was trying to get my SDS 1104X-E hooked up to my computer and i was leaning it forward to reseat the USB cable and pushed some buttons with my hand. I ended up with a split screen with a zoomed in window on the bottom. I know I can just hit the default button to get back to the original view, but I was wondering if anyone knew how to get back into this mode laterThanks!

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: April 12, 2021, 05:43:12 am
content: That looks like the horizontal zoom mode, on the rigol you get there by pressing the horizontal scale knob, maybe it's the same on the siglent?

author: tautech
author_rank: Super Contributor
timestamp: April 12, 2021, 05:54:34 am
content: Quote from: xenoxaos on April 12, 2021, 05:25:22 amWelcome to the forum.It's Zoom mode that you enter and exit with a press of the timebase control.If you look under any to the encoders all the other functions they do are marked.

author: szszoke
author_rank: Regular Contributor
timestamp: April 12, 2021, 05:55:45 am
content: I have this same model and I can confirm that pressing the horizontal scale knob is what brings this view up.All of the knobs can be pressed on this model and have a secondary function. Take a look at the legend below the knobs and you will see what a press will do.

author: xenoxaos
author_rank: Contributor
timestamp: April 12, 2021, 07:35:11 am
content: Thanks for pointing that out! Currently my scope is sitting below eye level so looking under the knob didn't really come to my mind!
E3633A no +15V rail  .... - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: April 16, 2021, 01:20:46 am
content: Just a sanity check here...I checked a E3633A and the display show big values (22.12VDC and 22.12Amp) and 0V output.+17.4V and -17.4V are present-15V is present+15V is missingV2 is missing (down from the +15V trough CR45)I took CR9 BZX84 C2V4 (2.4V)10V trough 10k - CR9 1.4V drop10V trough 1k - CR9 8.4V dropCR45 (6.81V) tested in place it is not short.I guess that CR9 one is broken... any parts down stream that could kill that part ? U25 U28 U35 U41 I ordered since I saw it in the forums here.The +15V bus is about 250kOhm to ground... I was expecting a short if one of the devices on the +15V / -15V rails would have been defective....
New thoughts on the Rigol DSA 815 - Page 1
Forum section: electronics / testgear

author: BJN644
author_rank: Newbie
timestamp: April 04, 2021, 07:57:55 pm
content: I'm in the market for a basic spectrum analyzer for amateur radio use, mainly tuning duplexers and checking antennas and feedline. I have read many reviews comparing the Rigol DSA 815 and the Siglent SSA 3021, and most say the Siglent is the better bang for the buck. Recently I've seen the price of the Rigol with TG drop below $1K and they now claim the RBW is 10Hz. Just wondering for the type of use that I'm going to use a SA for is the Siglent still considered a better bang for the buck at $400 more than the Rigol?

author: BJN644
author_rank: Newbie
timestamp: April 08, 2021, 07:03:41 pm
content: Thanks for all the replies, I went with the Siglent. Also grateful for the EEVblog discount.

author: Kean
author_rank: Unknown
timestamp: April 09, 2021, 12:12:56 pm
content: Not sure if you are being sarcastic about "all the replies". The EEVblog website was off-line for the last few days, so things will have been a bit quiet around here.Oh, and congrats on the purchase - hope you enjoy it. Maybe also look at a NanoVNA or similar.
New Hantek DSO2D10 vs Used Tektronix Digital Scope - Page 1
Forum section: electronics / testgear

author: imk
author_rank: Regular Contributor
timestamp: April 08, 2021, 11:37:28 am
content: Hello,Am wondering what the team thinks about buying a New Hantek DSO2D10 vs Used Tektronix Digital Scope please (or other solutions) ?I already have an Tektronix 2236 that is working fine all be it a few years old now.Problem is i have moved (right sized) into single story home as we don't need the big old family house and stairs anymore.Hence my new smaller man cave is getting a bit cramped with this Tektronix 2236 so i thought i would get a small desktop scope.After much good advice received on the blog I have on order DSLogic Plus Logic Analyzer so this should cover my protocol decoding needs.Why I am thinking of the DSO2D10 is because it has the signal generator function built in which would be useful.Open to all sorts of solution, do feel free to offer.Many thanks in advance imk.PS A life time ago i was working for ICL in kidsgrove on the BIG old mainframes (with enough lights to get a good Tan) and we had a bunch of BIG CDC disk drives delivered.In systems test where i worked we would integrate the system (Mainframe, CDC, comms box, printer etc) and let it run for a few weeks before signing it off and shipping it.Now these BIG CDC drives required water cooling so they were plumbed into the building main water supply.As we didn't have a proper chiller for these CDC drives the waste warm water just went down a garden hose under the false floor and into the drain.Well over the Easter weekend (No one on site other than security) the garden hose came off and filled the false floor with water, thus tripping all the system PSU etc.Sound familiar, history repeating itself, welcome back EEVBlog :-)
Oscilloscope Zoom Zoom Conference - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: April 04, 2021, 04:30:13 pm
content: A Semi Serious ProposalHere is a 50% in jest 50% serious proposal for the 1stOscilloscope Zoom Zoom Conference.Purpose(subject to refinement): Examine and compare the operating methods of oscilloscope manufacturers and models used to zoom in, zoom out, and trigger/search/navigate while the user and/or the oscilloscope manages memory as made possible by the various architectural designs.This entire preliminary outline is subject to improvement with input from EEVblog members.Format:With sponsorship by EEVblog, moderation by Dave, and management by an Oscilloscope Technical Panel selected by Dave, several oscilloscopes will be demonstrated for the EEVblog audience during a Zoom video conference.Following introductory demonstrations of some basic TBD functions (intended to be similar and to establish some baselines across each oscilloscope) the Oscilloscope Q&A Panel will comment and/or request specific functionality to be demonstrated on any of the oscilloscopes.Zoom Zoom Conference to be recorded for future playback and review.Oscilloscope Technical Panel(selected for objectivity)DaveW2AEWHowardlongothers TBD?Oscilloscopes~10 oscilloscopes to be demonstrated. Tentative Lineup, all 4 channel oscilloscopes:2 from Keysight. 1 3000 Series (the “reference” scope), 1 1000 series2 from Siglent. 1 2000 series, 1 1000 series2 from Rigol. 1 5000 series, 1 1000 series1 from GW Instek1 from Tektronix1 from R&SOscilloscope Q&A Panelnctnicotautech2N3055rf-loopfungusothers TBD?PS, remember, if you don't like this idea or you think it was stupid, it wasn't completely serious

author: exe
author_rank: Unknown
timestamp: April 09, 2021, 06:56:56 am
content: So, when are we starting?PS I can provide dso-138, I just need to add three more channels.
Chroma 63000 vs. B&K 8600 series DC Electronic Load - Page 1
Forum section: electronics / testgear

author: mightyohm
author_rank: Regular Contributor
timestamp: April 08, 2021, 10:03:08 pm
content: Does anyone have hands-on experience with the Chroma 63003-150-40 DC electronic load? How does it compare to the B&K 8600 series that Dave reviewed some time back?The Chroma has an optional LAN interface, which is nice (B&K only has USB) but I can't find any examples of what the web interface to the Chroma looks like (assuming it has one).Specs are similar but different enough that one is probably better than the other for certain applications.. The Chroma wasn't necessarily better all around. Price is comparable between the two.

author: tautech
author_rank: Super Contributor
timestamp: April 08, 2021, 10:20:08 pm
content: Quote from: mightyohm on April 08, 2021, 10:03:08 pmDon't think it does although it is PC programmable where a LAN connection when available is the most universal.If it had a webserver it would be mentioned in the Key Features for sure.If a good remote control feature set is important check out the SDL1000X range, their programming manual and the free EasySDL software that after having a bash around in it seemed very capable. It's a free 20MB download.
Rigol promotion sale until 2021.03.31 - Page 1
Forum section: electronics / testgear

author: PushUp
author_rank: Regular Contributor
timestamp: October 06, 2020, 01:14:35 pm
content: Anyone interested in a new Rigol DM30XX Digital Multimeter, for example? There is a promotion sale until 2021.03.31!Not only by Batronix, but several others...https://www.batronix.com/shop/rigol/DM3000.html@ DM3000:Do they wanna sell off the stock, because there will be a new successor?I could imagine, that there will be a new DM3000 successor in a Rigol DG800 casing...somewhere in the future...The entire list - this time by "Batter Fly" - not giving preference to a special dealer:https://www.batterfly.com/shop/en/promo-rigolCode:Promotions RIGOL TechnologiesDue date: 31 March 2021Description: price reduction oscilloscope DS1202Z-E to Euro 299 + IVAProducts link: DS1202Z-EDue date: 31 March 2021Description: price reduction oscilloscope MSO5104 to Euro 999 + IVAProducts link: MSO5104Due date: 31 March 2021Description: free option bundle for oscilloscope Rigol MSO8000 series and price reduction for MSO8104 and MSO8204Products link: MSO8000Due date: 31 March 2021Description: free option bundle for oscilloscope Rigol MSO/DS7000 seriesProducts link: MSO/DS7000Due date: 31 March 2021Description: free option bundle for oscilloscope Rigol MSO5000 seriesProducts link: MSO5000Due date: 31 March 2021Description: bundle EMI and PreAmplifier option for spectrum analyzer RSA3000N seriesProducts link: RSA3000NDue date: 31 March 2021Description: free real time BW upgrade and PreAmplifier option for spectrum analyzers RSA5000N seriesProducts link: RSA5000NDue date: 31 March 2021Description: price reduction for spectrum analyzers DSA815 and DSA815-TGProducts link: DSA815 , DSA815-TGDue date: 31 March 2021Description: price reduction for spectrum analyzers DSA832E and DSA832E-TGProducts link: DSA832E , DSA832E-TGDue date: 31 March 2021Description: price reduction for arbitrary waveform generator DG1000Z and DG2000 seriesProducts link: DG1000Z , DG2000Due date: 31 March 2021Description: price reduction digital multimeter DM3000 seriesProducts link: DM3000Cheers!

author: tv84
author_rank: Super Contributor
timestamp: October 06, 2020, 03:50:23 pm
content: Current RIGOL Canada PromotionsSimilar should exist for other parts of the world...

author: EE-digger
author_rank: Frequent Contributor
timestamp: April 04, 2021, 03:02:24 pm
content: I was bummed out on 3/31 when the promotional form said 3/30/2021 was the cutoff. It actually helped though because I still haven't decided what to get ... RSA, SVA, 3000n, no n, RT or no RTAfter talking to Rigol, I discovered the cutoff for the 3000n and most others is 9/30/2021. The lady said they would immediately update Tequipment and other distributors. Some of the waveform generator promos end 6/30/2021.

author: normi
author_rank: Regular Contributor
timestamp: April 04, 2021, 08:16:03 pm
content: I find that as long as the competitor prices remain the same the deals are extended.
DM3058E Data saving/logging - Page 1
Forum section: electronics / testgear

author: sahko123
author_rank: Frequent Contributor
timestamp: April 03, 2021, 01:16:22 pm
content: I want to save data to csv onto my usb stick and the multimeter only has enough ram to hold 2000 points of data which means when i record to USB in csv format i only get 2000 points of memory is there a way to have it either write automatically every time it reaches 2000 or somehow get it to have a larger csv file being written to constantly? RTFM'ing has only gotten me as far as knowing that connecting USB expands memory but I'm not sure if that means USB to PC or usb stick though

author: Wytnucls
author_rank: Super Contributor
timestamp: April 04, 2021, 03:44:19 pm
content: https://hackaday.io/project/166880-data-logger-device-for-dm3058-digital-multimeter

author: Wytnucls
author_rank: Super Contributor
timestamp: April 04, 2021, 03:53:57 pm
content: https://www.eevblog.com/forum/testgear/rigol-dm3058e-data-logging-to-pc/

author: voltsandjolts
author_rank: Unknown
timestamp: April 04, 2021, 04:08:09 pm
content: https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

author: Wytnucls
author_rank: Super Contributor
timestamp: April 04, 2021, 04:17:02 pm
content: Rigol has created a simple solution with Excel via USB:
What's this? Worth buying? ALPINE ASG-301 100kHz-170MHz AM/FM Signal Generator - Page 1
Forum section: electronics / testgear

author: Eifel
author_rank: Newbie
timestamp: September 21, 2020, 10:32:19 pm
content: Hello!I am looking for AM/FM signal generator for AM/FM radio repairs (or attempts to repair). Saw this on ebay:eBay auction: #https://www.ebay.com/itm/124347200042?ViewItem=&item=124347200042Looks very nice, but I couldn't find any information on it by googling alpine and model name: ASG-301.Also what possibly may mean this "AM noise limit sensitivity high"? Untested and sold as-is. Worth buying?Seller also have listed untested "Panasonic VP8193A" that one looks kinda popular..

author: coromonadalix
author_rank: Super Contributor
timestamp: September 22, 2020, 06:34:26 am
content: This link is better :https://www.ebay.com/itm/124347200042?It open without problemsAlpine had its name applied on some brands, can't recall witch, if the price stay low, it seems a good opportunity to buy it, but the problem written on the top case ? not sure if it can be a nag

author: Eifel
author_rank: Newbie
timestamp: April 04, 2021, 12:51:58 pm
content: Hi!I bought this generator. As there's no info about it. I think it's a rare thing and created a review on youtube about it:If someone ever will wish to buy another one, maybe my video will be usefull.
Rohde & Schwarz CMS50 or Marconi 2965 as radio tester set : which one ? - Page 1
Forum section: electronics / testgear

author: ytterligare
author_rank: Regular Contributor
timestamp: April 02, 2021, 06:56:38 pm
content: Given I can get’em more or less at the same price (500$ more for the CMS ), which would you choose spec wise and not ?The R&S has B1/B2 option and, I believe, it is 10 summers younger than the Marconi...Your thought ?

author: geggi1
author_rank: Frequent Contributor
timestamp: April 02, 2021, 08:47:06 pm
content: Go for the CMS.

author: ytterligare
author_rank: Regular Contributor
timestamp: April 02, 2021, 10:46:28 pm
content: Thank you, I heard that the SA section is quite "slow"...any owner can confirm this ?Also...where are the damn manuals for the CMS??!! Anyone can point me to any link ?Tnx

author: xmo
author_rank: Regular Contributor
timestamp: April 03, 2021, 04:05:25 am
content: http://eww.ko4bb.com/getsimple/index.php?id=manuals&dir=Rohde_Schwarz/Rohde_Schwarz_CMS52

author: ytterligare
author_rank: Regular Contributor
timestamp: April 03, 2021, 04:46:44 pm
content: Quote from: xmo on April 03, 2021, 04:05:25 amThank you xmo, I already had it, but on first page it doesn’t say CMS50/52/54, so I thought it was specifically for model 52...