hybridfree/eevblog-posts huggingface dataset:
Comparison between Tektronix TDS2002C and Hantek DSO5102P - Page 1
Forum section: electronics / testgear

author: markusz
author_rank: Contributor
timestamp: January 11, 2022, 04:49:04 pm
content: Hi experts,I have the chance to purchase a USED + Uncalibrated TDS2002C versus a NEW DSO5102P for approximately the same price (under $300 CAD). The TDS2002C is slightly cheaper.Here is my context:- Need a general purpose Oscilloscope for analog study (not for production)- My analog knowledge is negligibleAfter a few days' research on EEVBlog and Google, here is what I gathered:- Both brands are good, but the DSO5102P is recommended many times as an affordable one for beginners;- TDS2002C seems to be an obsolete model and frankly I think distributors charge over $1000 CAD;- On paper DSO5102P seems to have better numbers (100MHz versus 70MHz, 2 Channel versus 2 Channel, 1GS/s versus 1GS/s, 40Kpts versus 2.5Kpts). However the datasheet of TDS2002C indicates that it can also have much higher bandwidth (up to 200MHz) and 4 channels, which confuses me.- There are many fancy features on both that I don't know whether I need or not (e.g. 16 automated measurements, limited FFT, etc.)- Calibration doesn't seems to be a hell lot of work, but judging from the price they charged ($200+ CAD), I suspect I underestimate the difficulty. I don't have a function generator so I guess I need one for calibration, too.I'm wondering what do you think? Is there anything I misunderstood or overlook? Thanks!

author: tautech
author_rank: Super Contributor
timestamp: January 12, 2022, 08:03:14 am
content: The Tek would be my preference over the Hantek despite it being second hand and without the factory calibration that comes with a new scope.Both are quite basic DSO's although when you come to upgrade the Tek will be more highly sought after and easier to sell.My first DSO was a TDS2012B and while it's quite dated now it should serve you well.
HP 6671A x2 Better Way To Handle Reverse Current Flow - Page 1
Forum section: electronics / testgear

author: Dexter12353
author_rank: Newbie
timestamp: January 12, 2022, 02:30:50 am
content: Hello!Recently I've acquired 2x HP/Agilent 6671A System Power Supplies. Their output is 220a @ 8v each. Let's come back to this...Currently, I am successfully using HP 6031A 20v120a 1kw power supply, and I work with LiFePO4 batteries on a daily basis, tasks including top-balancing and capacity testing, then recharging. To break it down for those non-battery experts, I am reconnecting and charging all 4 cells from a 12v battery in parallel (3v), providing CC @ max current of the supply, until reaching 3.65v, then going CV until the current reaches 1/100th the capacity of the cell. I then reconfigure for 12v and the cells are all equalized out. It works well because the power supply can also be used to charge the batteries when they are setup in a 12v configuration thanks to 20v max limit of power supply.The user manuals for the power supplies specifically state the following:QuoteTo accomplish this with my current setup, I have a 200a stud-type diode screwed into a heatsink with a small fan. Heat dissipation is minimal, because I'm dealing with only 120a & .7v forward voltage, so around 80 watts of heat, no big deal. I then provide voltage sense leads after the diode, connected directly to the batteries being charged and things work great.Now that I have the two new power supplies, I can theoretically connect them in parallel, and charge 3.6v @ 440a, and due to the 8v limit if I wanted to charge at 12v, I would need to connect them in series (16v max limit). What an improvement to the speed that I can work, right?Trouble is, the new power supplies need diodes also. If we calculate 220a of current @ .7v forward voltage of a diode per supply, I now have ~300w of heat to do something with. Where I previously had a tiny computer fan and a heat sink from a power inverter that was in the scrap bin, this new setup will require much more heat dissipation if I'm going to take the same approach of using a diode. Not that power usage of the system is a huge concern, I'm not the biggest fan of having a new 300w heater in the lab.So I guess the question is, how can I build a more ideal diode here? I've heard that you can use PFETs (or perhaps NFETs) to provide a better solution here, but I am clueless...My area of expertise is batteries not FETs. Any guidance in the right direction is very much appreciated!
length of external clock cable and GPS antenna cable - Page 1
Forum section: electronics / testgear

author: metebalci
author_rank: Frequent Contributor
timestamp: January 12, 2022, 07:42:08 am
content: Is there a recommended max. length for a cable carrying external clock signal ? Same question also for GPS antenna cable.I ask because I wonder if I can use 10-20m cables for these, to connect GPS antenna to a GPSDO and/or connecting GPSDO clock output to test equipment.
Xantrex XHR Voltage control Knob, Service Manual - Page 1
Forum section: electronics / testgear

author: Andyf97
author_rank: Newbie
timestamp: January 09, 2022, 12:11:31 pm
content: Happy new year to you all.Any of you guys know what is the Knob used on Xantrex XHR series Power supplies.I am not actually sure exactly who made these, Xantrex Sorensen or Amatek ( I suspect its sorensen and the others are just brands, maybe somebody could clarify that )I have a few of these beauties XHR 33-33Also, anyone have an schematics for themThe knob has a 22mm skirt ie overall diameter19mm overall high the actual knob part is just less than 19mm

author: coromonadalix
author_rank: Super Contributor
timestamp: January 09, 2022, 01:24:58 pm
content: Never saw any leaked services manuals in Xantrex forms ... some sorensenMaybe a 3D printed clone of your knob could help for a while ? or fins some shaft compatibles ones ?

author: pqass
author_rank: Super Contributor
timestamp: January 09, 2022, 02:05:01 pm
content: It looks like the same knob used on XANTREX XT-Series supplies.It has a flange just like your PS (not apparent in the picture below) but you can't take the knob off unless you unscrew the faceplate from the PCB behind.It wouldn't surprise me if they re-used parts. The knob part number isn't listed in the XT service manual that I have.The flange base on my XT PS is 1 inch in diameter.

author: Andyf97
author_rank: Newbie
timestamp: January 10, 2022, 07:14:58 pm
content: Yes they look similar, I suspect they are common.I added some photos of the broken one and some dimensions.

author: pqass
author_rank: Super Contributor
timestamp: January 11, 2022, 08:44:18 pm
content: Close, but they're not the same.Maybe you can super-glue yours back together and just tape the shaft enough that a fiction fit would work.The XT series knob is a friction fit; has no grub screw.Instead, there is a rubber gromit at knob center to hug the round shaft.
Tektronix  TCA-1MEG  failed - Page 1
Forum section: electronics / testgear

author: charlyd
author_rank: Frequent Contributor
timestamp: May 07, 2021, 09:36:20 am
content: Hi i bought a TCA-1MEG adapter on ebay and when it arrived and i connected it to ch1 (tried all channels) ....it gave me the popup like in the attachment ...( the seller was only intent a partly refund....)because for me it is a new adapter, that is why this model of adapter is a unknown type for my TDS7404 because it is the first and i hope only one.Anybody have this error also or know how to fix it? Did i use the wrong procedure or is it a failed adapter, which component(s) needs to be swapped out?tips and help wanted.

author: charlyd
author_rank: Frequent Contributor
timestamp: November 09, 2021, 01:21:32 pm
content: .....bump.......Anybody can help me ontrack and give me some diagnose info...so i can check with this adapter ?

author: charlyd
author_rank: Frequent Contributor
timestamp: November 29, 2021, 10:07:38 am
content: there are two components which may course the problem, i think.a chip called PCF-8574AT - Remote 8-bit I/O expander for I2C-bus with interruptand i found a (by now famous :-( ) ST- 24C16WP - 16-Kbit serial I2C bus EEPROM.

author: Kean
author_rank: Unknown
timestamp: November 29, 2021, 11:11:35 am
content: If it isn't recognised, then it sounds like the I2C eeprom might be faulty or corrupted. It is probably not too hard to connect some wires to it and try read it with an I2C adapter/eeprom reader.There seems to be very little info about reversing the Tekconnect/VPI interface on the web. A few mentions of similar Tek probe interfaces with I2C are in this blog post which might help you confirm the data looks somewhat valid:https://debugmo.de/2010/03/probe-hacking-part-2/There is a teardown by forum user TiN athttps://xdevs.com/review/tca_1meg/but without much detail as he probably didn't need to do any repairs. You could try message him to see if he knows anything more, or has a dump of the eeprom from his TCA-1MEG:https://www.eevblog.com/forum/profile/?u=26015

author: charlyd
author_rank: Frequent Contributor
timestamp: November 29, 2021, 11:21:27 am
content: Hi Thanks for your reply and the good tip . i asked him if he could help me out. But maybe here somebody already have agood working dump of the EEprom from a TCA-1MEG console adapter.if yes please contact me or help me out with the file. It would make me very happy.https://www.eevblog.com/forum/repair/eeprom-dump-file-from-a-tca-1meg-console-adapter/msg3843410/#msg3843410

author: charlyd
author_rank: Frequent Contributor
timestamp: January 11, 2022, 09:03:41 am
content: ...bump....anyone who can help me out with an export of the working TCA-1MEG eeprom dump. ( 24C16WP )please get in touch.
Does this DSS5020 Oscilloscope fit my requirement? - Page 1
Forum section: electronics / testgear

author: markusz
author_rank: Contributor
timestamp: January 10, 2022, 11:48:08 pm
content: Hi experts,I just started to teach myself electronics so I know pretty much nothing except KCL/KVL, node analysis and Capacitors. I'm thinking about purchasing a low-cost analog Oscilloscope so this $100 CAD used Kikusui DSS5020 caught my eye. AFAIK new digital ones costs at least $350 CAD so this could be a good deal. (manual:https://manual.kikusui.co.jp/D/DSS5020_E.pdf)So far I now that it's dual channel but one of the two probes is missing. I read the manual and looks like I can still use one channel so shouldn't be a big deal. I'd like to use it to learn analog electronics and hopefully it at least supports my first year of study (Your basic circuit class up to Diode, Transistors and MOSFET). However I have zero knowledge about Oscilloscope, so I have two questions:Q1: Does this model, given that it works (with one probe), fits my study of analog circuit?Q2: I watched EEVBlog 196 about Tektronix 2225. I guess I can check for intensity/focus/position/rotation, and the seller shows a picture of a square wave that looks good. But I don't have any other equipment (no function generator, the only thing I have is a multimeter). What else can I check? I don't have much time to build up knowledge because the price is too good to miss...---------Edit----------I just made the call and apparently the seller is a retiring engineer. He asked a few questions and looks it fits my purpose. I kinda trust the guy over the phone and will probably make a visit this week to take a look.

author: adam4521
author_rank: Regular Contributor
timestamp: January 11, 2022, 10:12:58 pm
content: If it's local enough and the engineer takes the time to show you it working, and you have the space for it, why not take a look. It might have been better (less complex inside) if it didn't have the digital capture feature. This has engineering curiosity value but if you actually need capture, you'll likely need it to go faster and would be better off with a DSO. I bought an analogue Tek scope about 10 years ago but the price gap to DSO has become sharply narrower today, even the lowest cost bench DSOs merit consideration. If you go ahead, make sure the unit is in good shape with nothing bent or broken and stable clear traces. The availability/market for these is drying, so while it stays working, it will likely hold its value.As a related aside, does anyone know anything about new cheapie DSO, Kiprim DS1202 (2 channel 120MHz, Amazon UK £160,https://www.amazon.co.uk/dp/B098LBV339/ref=cm_sw_em_r_mt_dp_dl_KRGTWAW4QC0R13H3X9B4)? I don't recognise it as a rebadge of anything. No website, no proper spec sheet.
Agilent/Keysight U1253B Multimeter failure - Page 1
Forum section: electronics / testgear

author: FrozenHaxor
author_rank: Contributor
timestamp: January 11, 2022, 07:45:09 pm
content: Hello,I'm having a severe problem with my multimeter, perhaps somebody would have an idea as to what could be wrong with it - basically it does everything but display the measurement, instead of a number only comma is visible and curiously, only the capacitance range works.This meter had this problem occassionally for the best part of the 10 years that I own it (I'm the first owner. Got it brand new), I originally attributed this problem to being picky with the 9V battery used. The original "Powerex" 9V Ni-MH battery quickly gave out and I wasn't able to charge it from the meter any more. I've found the meter to be extremely picky and particular about the Ni-MH battery being used, with most off the shelf batteries not being able to charge at all, but it wasn't a deal breaker as I was still able to use GP batteries in it, and even managed to get a new "Powerex" replacement that it came with originally.Basically same failure would appear, and physically removing the battery from the meter and reinstalling it would solve the issue. Sometimes it wouldn't, and I found that removing the battery then shorting it out to drop the voltage a bit and then reinstalling it would solve the issue. (they didn't measure having excessive voltage, just the meter was picky about it). I managed to push past this failure for years but today no matter what I do, I can not get it to boot properly. Everything works, even the menu and I can also connect to Bluetooth interface but no measurements are being made.I wanted to get a second meter that would also have a good display for indoor use and extremely fast measurement update rate, got UNI-T UT171C but it's much slower, I'm not satisfied with it as a replacement.Meter is used almost on daily basis, indoors use only, never been opened more than battery door, never seen any short circuit on AC range, never blown any fuse, never seen over 450V DC. I always took good care of it, never been dropped.Uploaded a video showing this behavior, if somebody has any idea I'm looking forward to investigate and repair this meter.
Would a 64 GB SSD work as a replacement hard drive for CMU200 ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: January 10, 2022, 12:46:51 pm
content: Hi,I'm trying replace the hard drive of a CMU200. I've read some old posts here about this and seems like I should select 32GB or 40GB ssd. Would a 64GB would be incompatible with the CPU board of the CMU200 (Sorry if I'm making wrong assumption) ? But what about the space required during the upgrades for the CMU200. Does a usual CMU200 OS take 32GB full drive and, would I need the extra space when I try to install software for a new option ? Please let me know your advice on this.Thanks.

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: January 10, 2022, 01:18:43 pm
content: I think the overall size used by the OS with all software options installed was less than 1 GB. SSD also seems a bit overkill. A CF->IDE adapter also works fine.
Siglent SDS1104X-E unknown LAN icon - Page 1
Forum section: electronics / testgear

author: andreamazzai
author_rank: Newbie
timestamp: January 09, 2022, 11:16:37 pm
content: Hi EEs, my very first post here!Today I have connected my SDS1104-X-E to my home LAN. DHCP working fine. I can see the screen of the device on my PC's web browser; the refresh is fine.The weird thing I noticed the LAN icon seems a "warning" advice that I cannot find in the user manual / quick guide. It is a yellow triangle with a red exclamation mark on top of it. What does that mean?Before posting, I tried to search on the forum and found nothing.Thank you!

author: tautech
author_rank: Super Contributor
timestamp: January 09, 2022, 11:35:46 pm
content: Never seen this before.Is it the same with another LAN cable ?Which firmware are you running ?Latest:https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1xx4X-E_V6.1.37R8_EN.zip

author: andreamazzai
author_rank: Newbie
timestamp: January 10, 2022, 12:46:26 pm
content: Quote from: tautech on January 09, 2022, 11:35:46 pmThis morning I turned on the scope in order to test with a different cable and the icon is now "normal". Going back to the old cable also shows the "normal" icon, so I don't think it is related to the cableIt would be good to know what this unseen icon means, toughBTW I was on 8.2.6.1.37R6, going to upgrade now - thank you for pointing that out!
TIF 660 leakage tester teardown and theories of operation - Page 1
Forum section: electronics / testgear

author: mdubinko
author_rank: Contributor
timestamp: January 10, 2022, 05:55:28 am
content: I picked up a cute little tool called a TIF 660 capacitor leakage tester. It runs on a 9V battery and has red and black test leads, and a speaker; no screen or other display. Apparently no longer for sale (and the original manufacturer went through multiple levels of acquisition) but it looks like this:https://www.amazon.com/Tif-TIF-TIF660-Capacitor-Tester/dp/B000NQ8F80When you attach a fixed resistance across the leads and push the button, you get a steady tone, with lower pitch for higher resistance. At some threshold, it stops making noise.When you attach a capacitor (and push the button... I left the switch out of the schematic) you get an audio sweep from high to low pitch, then silence (in case of a good capacitor) or a low pitch or even series of clicks for a leaky capacitor. With some practice, you can even gauge the capacitance by the exact sound of this tone.The case was either glued or ultrasonically welded, so I did some damage getting inside. I was expecting a 555 but there were only discreet transistors on a classic 80s-style single-sided PCB. I traced everything out and redrew it a few times to make it easier to understand. It looks like there's a PNP/NPN combo running as a relaxation oscillator, and another PNP (labeled Q3) and a darlington PNP (Q4) modifying the pitch and something else I can't quite figure.There's a voltage divider across the 9V between a 20M resistor and the device under test, the midpoint heading off to both Q3 and Q4. My initial assumption was that the rest of the circuit are effectively a buffered voltmeter on this voltage divider, but when I took the 10uf tantalum capacitor out of circuit for testing, the circuit still produced a (constant) tone with a non-leaky capacitor attached. Q4 charges that capacitor until it turns itself off, I guess. So I am starting to conclude there's some reasonably clever design here.Can anyone do a better job explaining the theory of operation for this schematic?Thanks! -m
Milwaukee C12-CME Clamp Meter - Manufacturer? - Page 1
Forum section: electronics / testgear

author: machineage
author_rank: Newbie
timestamp: January 05, 2022, 01:13:57 pm
content: Hi allSo I've had this clamp meter for some years, bought it when it was in a sale.I bought mainly for its ability to measure DC current up to 1000A, and given I have nothing else to compare its results with, I wondered if anyone might know who the originating manufacturer might be, ergo its likely accuracy?Specs are included in the images below.Many Thanks!

author: machineage
author_rank: Newbie
timestamp: January 09, 2022, 06:57:05 pm
content: Anyone with any ideas on this? Thanks

author: bdunham7
author_rank: Super Contributor
timestamp: January 09, 2022, 07:03:46 pm
content: I asked a similar question about a different Milwaukee DMM in another thread. I think Milwaukee has take the extra step of having a custom product made rather than a simple rebadge.

author: floobydust
author_rank: Super Contributor
timestamp: January 09, 2022, 08:17:49 pm
content: It's made by Uni-Trend. They have their own Uni-T products as well as contract manufacture and private-label for OEM's. Milwaukee uses them a lot.specs are herehttps://www.milwaukeetool.com/Products/Instruments/Clamp-Meters/2239-201% DCV, 2% DCA.It's rechargeable 12V lithium-ion powered backlit with worklight. Looks like something Captain Kirk used to wipe out an alien or two.DCA accuracy and resolution is not always great because the jaws are huge compared to a single conductor, the jaws get magnetized and you can be up against core hysteresis which causes sticky readings. Temperature can have a large effect on Hall sensors.P.S> Why is there a diode? bodge on pin 53 lol.

author: machineage
author_rank: Newbie
timestamp: January 09, 2022, 08:28:15 pm
content: Thanks @floobydust!How funny it's made by Uni-T, I have a UT71D meter!I wondered how you can tell, what are the giveaways? It does indeed look like an alien zapperI hadn't noticed the strap-on component afterthought!
Rigol DS1054Z frequency help - Page 1
Forum section: electronics / testgear

author: scott216
author_rank: Regular Contributor
timestamp: January 09, 2022, 05:23:46 pm
content: I have a 20Hz PWM pulse coming from my Arduino. On my Rigol DS1054Z, it shows 15 Hz on the top right. But if you calculate it by looking at the screen, it's 20 Hz. Also, on the bottom left, the period and frequency and both show "*****". See attached pictureIf I hook my probe the the test square wave coming from the scope, the frequency on the top right is correct, but the bottom period and frequency still show *****

author: TheSteve
author_rank: Unknown
timestamp: January 09, 2022, 07:35:26 pm
content: What happens if you adjust the timebase to have more samples on the screen - I suspect it will be much happier.

author: scott216
author_rank: Regular Contributor
timestamp: January 09, 2022, 08:30:16 pm
content: Quote from: TheSteve on January 09, 2022, 07:35:26 pmThat worked! Thanks.

author: Fungus
author_rank: Super Contributor
timestamp: January 09, 2022, 09:57:44 pm
content: The DS1054Z calculates frequency, etc., using the trace actually displayed on the screen.Sometime you need more pulses on screen to get an accurate number although two ought to be enough.Edit: I just noticed you set AC mode in your manual settings where auto mode set it to DC.AC mode means the signal crosses zero and it can do the calculation.
Tek 834 Serial Comms Tester - SERVICE manual? - Page 1
Forum section: electronics / testgear

author: HarryDoPECC
author_rank: Regular Contributor
timestamp: December 06, 2021, 04:53:54 am
content: Picked up one of these to help in my adventures with VT100s, ASR33s and the retro-tech that goes with these.The 834 came out at the start of the 80s, I have found user and training manuals at the usual archive sites, and there is one manual for a ROM pack that has schematics - so I feel that there may also have been a very helpful service manual. But not at any of the usual places and my first few pages of search results are blank.So, anyone aware of a Service Manual for the 834-835-836 series, or happen to have a copy??Thanks in advance

author: gslick
author_rank: Frequent Contributor
timestamp: December 06, 2021, 03:58:53 pm
content: If you can't find one anywhere else there is one listed on eBay in the USTektronix 070-3399-01834 Data Communications Analyzer Service Manualhttps://www.ebay.com/itm/363646166727I have bought items from that seller in the past.

author: HarryDoPECC
author_rank: Regular Contributor
timestamp: December 08, 2021, 05:23:04 am
content: Thanks! Nice find.

author: HarryDoPECC
author_rank: Regular Contributor
timestamp: January 09, 2022, 09:30:15 am
content: Got the paper copy. Worth the cost for the time it saved, since unit was DoA. But now is happy and working.I have made scans and sent to ko4bb, BAMA and TekWiki. or PM me if not find-able.
Testing a "Used - Like New" Siglent? - Page 1
Forum section: electronics / testgear

author: cds333
author_rank: Contributor
timestamp: December 23, 2021, 06:11:02 am
content: So recently I found aUsed - Like NewSDS1104X-E on Amazon with prime.The box itself was sealed with Siglent tape, and all the probes seemed untouched and all had the default yellow rings.It had only 4 startups on the counter.In the past I have had some bad experiences with Amazon Warehouse items, but this one is so far looking pretty good, especially if it actually made it back to Siglent for them to check it out.Does the Siglent tape mean that they did in fact check it out?Or would they have reset the counter if it made it back to the factory?And are there any tests I can do to make sure the first guy didn't send it back because it was faulty?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: December 23, 2021, 06:34:24 am
content: All new units have a zero boot count however if the firmware has been updated since it left the factory that may have increased the count to 4. That the probes haven't been assigned to channels also points to it being a new unit.Update the FW and OS to V2 as necessary from below then run the AutoCal and if it all completes as expected enjoy the scope.https://int.siglent.com/download/firmwares/?ProId=12

author: dophuc
author_rank: Contributor
timestamp: December 23, 2021, 08:50:49 am
content: Hi tautech, Is it possible to reset the boot count?

author: Psi
author_rank: Super Contributor
timestamp: December 23, 2021, 10:41:56 am
content: It probably is with the right tools, but the feature would be pretty useless if the general public could do it,

author: tautech
author_rank: Super Contributor
timestamp: December 23, 2021, 10:53:43 am
content: Quote from: dophuc on December 23, 2021, 08:50:49 amYes, with factory secret key presses that we cannot share online.

author: tszaboo
author_rank: Super Contributor
timestamp: December 23, 2021, 11:36:05 am
content: Quote from: tautech on December 23, 2021, 10:53:43 amIs it "IDDQD" ?

author: cncjerry
author_rank: Unknown
timestamp: January 11, 2022, 07:29:48 am
content: "Swordfish"I just bought an 1104x-e and now that I think about it, I should have checked the new, refurbished, other seller lists.
Remote Command On TTI-TF930 - Page 1
Forum section: electronics / testgear

author: elbourne12345
author_rank: Newbie
timestamp: January 08, 2022, 12:57:08 am
content: Hello,Apologies if this question seems very basic, but I have a TTI-TF930 at my disposal as of now, and for some reason I'm unable to figure out how to output instructions to itvia USB Serial. Through my serial port monitor, after repeatedly inputting different commands, I was able to get to the point where when I entered a function it would output thaton the TF930, but since then haven't had the same success. Could someone please elaborate on how to actually do this, as I'm not too experienced in this field. Would be greatly appreciated.I've also attached a shortened version of the manual with just the remote command bits.Thank you

author: MarkL
author_rank: Unknown
timestamp: January 08, 2022, 03:28:30 am
content: I have some other Aim-TTI equipment (MX-100TP and MX-180TP), and it appears to have a similar interface as your TF-930.One thing I found that's easy to overlook is that every command line you send MUST be terminated with a 0x0A (aka. line feed or Ctrl-J), otherwise it will be ignored.Just a guess. It had me stumped for a while and I thought my USB interface was dead.And one more detail... Because the internal USB implementation is a USB to serial converter, you also have to have the serial parameters set up correctly (115200, 8 bits, no parity) for the COM port.

author: HKJ
author_rank: Super Contributor
timestamp: January 08, 2022, 06:31:59 am
content: TestController support remote control of this device.https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/https://lygte-info.dk/project/TestControllerIntro%20UK.html

author: elbourne12345
author_rank: Newbie
timestamp: January 08, 2022, 02:31:04 pm
content: Thank you so much, I tried two other serial port monitor softwares and for some reason they never worked. This only took 5 minutes and everything works perfectly.Very much appreciated.
Owon HDS272S: could you post sample data? - Page 1
Forum section: electronics / testgear

author: eti
author_rank: Super Contributor
timestamp: January 04, 2022, 03:40:20 am
content: Owon HDS272S: could someone that owns one, please post sample data in .CSV format and screenshots from the device? (Internal screen captures from device memory, not photos of the unit 😁😉😉)Many thanks indeed and Happy 2022 😀

author: hobbeeist
author_rank: Contributor
timestamp: January 07, 2022, 09:30:50 am
content: You might take a look athttps://www.eevblog.com/forum/testgear/owon-hds-200-handheld-oscilloscope-w-builtin-dmmawg/msg3923522/#msg3923522
Trying to get function generator and serial decode for a Siglent 2204X. - Page 1
Forum section: electronics / testgear

author: Kev31779
author_rank: Newbie
timestamp: January 06, 2022, 10:33:14 pm
content: Hello I have a Siglent 2204X and was wondering if anyone had a way to enable the function generator and Serial decode. The unit is now obsolete and discontinued. I tried to contact Siglent to see what they could offer me and they want full price to enable the 2 options. Almost 400 dollars!! Ah no. And they were kind of off put from me not agreeing with those prices and comparting to new scopes on the market. I can probably get into another scope at that cost with those options natively, maybe a bit more but what the? No way am I going to spend that on a 6-7 year old scope for just keys to enter in. What other options is there? I hate software enabled features behind a pay wall that holds your hardware hostage. What a crock. I mean the scope is capable of doing it but pay more to unlock it. I know they are not the only ones to do it but its kind of BS. Doesn't cost them any more.
SDS2000X-E in XY mode with ERES - Page 1
Forum section: electronics / testgear

author: FrancisM
author_rank: Contributor
timestamp: January 06, 2022, 07:59:53 pm
content: Hi,I made some curve tracing in XY mode and experienced a freezed scope on some occasions.What I can say now is that it happens when the curves are crossing the limit of the window with ERES activated.As long as they stay inside the boundaries, everything seems fine.On the first pic, I tried to fill the screen but went a step too far. It freezed while switching to 100mV/DIV on X axis.The only knob remaining active is the power button, all others become irresponsive. The screen is no more updated.Funny thing and for the first time, the crash ended up in a four channel scope with CH3 & CH4 appearing in the menu.I was able to reproduce it with another picture, but most the time the extra channels do not appear.It doesn't happen with a flat line, there must be some fancy curves.But when the conditions are met (ERES + resizing X axis too much), it freezes every time.Not a big issue, my workaround is to activate ERES once the curves fit nicely in the window and deactivate it while playing around.The latest firmware is installed.(V1.1.19R5)Francis
Need help ,Lecroy WaveRunner 625ZI fail to boot！ - Page 1
Forum section: electronics / testgear

author: Yike
author_rank: Contributor
timestamp: January 04, 2022, 03:17:52 am
content: Hi everyone, New owner of this unit. Sorry to repeat the post. I want to ask experienced people for advice in solving my problem. I have a LeCroy 625zi. I plan to reinstall the system and find that there is a password. Therefore, I remove the BIOS battery. After installing it back, I can't start it again. The DOS interface is not displayed, and only the fan is working. I can confirm that the power supply is OK！And all output voltages are qualified！ How can I repair it?Thank you in advance for your suggestions.

author: Martin Miranda
author_rank: Regular Contributor
timestamp: January 04, 2022, 03:51:27 am
content: tried installing a 2nd external monitor?

author: Yike
author_rank: Contributor
timestamp: January 04, 2022, 04:03:37 am
content: OK,I will do it this night! Thank you for your advice！

author: Yike
author_rank: Contributor
timestamp: January 05, 2022, 12:33:46 am
content: I saved my machine, There is still one fault left，who knows which component is damaged？

author: darkstar49
author_rank: Frequent Contributor
timestamp: January 06, 2022, 08:37:24 am
content: doesn't help much... what menu are you in ?? Would be useful to see the left part of the screen...Some service menu's are not applicable to all scopes, so maybe that's the case here ?? Therefor, need to see the left pane as well...
Anritsu MS2721B GPS receiver get it enabled - Page 1
Forum section: electronics / testgear

author: knudch
author_rank: Regular Contributor
timestamp: January 06, 2022, 08:32:31 pm
content: HiJust got a used MS2721B, I got a version with GPS receiver option but it is not enabled.It was pointed out that it not was enabled....so no issue there.Any idea how to get it enabled ?Option 032(GPS) does not show up in system info
H-field probe: how to characterize with up to GHz magnetic field? - Page 1
Forum section: electronics / testgear

author: BelgianEngineer
author_rank: Contributor
timestamp: January 04, 2022, 10:17:16 pm
content: Hey all,I've built a set of near-field (H-field) EMC probes which I would like to characterize. I noticed that a common characterization curve is the amplitude vs. frequency for a fixed magnetic field curve (see page 4:https://www.beehive-electronics.com/datasheets/100SeriesDatasheetCurrent.pdf). Does anyone has an idea on how they manage to generate an oscillating magnetic field up to such a high frequency (>1GHz)?I was tempted to think that an Helmholtz coil directly driven by a signal generator/tracking generator would do the trick but looking a bit more into it, it seems difficult to reach that kind of frequency due to the increasing coil impedance with frequency.Alternatively i looked at characterizing the probes on a 50Ohm microstrip driven by a signal generator but that does not seem to be a commonly used approach and I doubt I can make any assumptions on a fixed magnetic field intensity with that setup.I am looking into making a DIY solution if possible such that I learn a bit with it at the same timeAny lead is welcome!

author: knudch
author_rank: Regular Contributor
timestamp: January 05, 2022, 06:36:18 am
content: Try to look into TEM or GTEM cellsThey are very often used for calibration of field sensors

author: BelgianEngineer
author_rank: Contributor
timestamp: January 05, 2022, 08:58:48 am
content: Quote from: knudch on January 05, 2022, 06:36:18 amWouldn't TEM or GTEM cells usually be used for electric field characterization rather than magnetic field? How would you go at showing the response of a H-field probe to 0.1uT at different frequencies with them?

author: knudch
author_rank: Regular Contributor
timestamp: January 05, 2022, 09:53:17 am
content: As TEM & GTEM has far field condition....both magnetic and electric field strength are predictable (upper sit orientation )But you are challenge by that factor how well your sensors suppress electrical fieldSo will it also been in the application of the sensors

author: knudch
author_rank: Regular Contributor
timestamp: January 05, 2022, 09:57:48 am
content: Suppression of electrical field:That's why magnetic sensors often has a electrical shielding build inYou can get an indication of field suppression by turning the probe 90 deg (in the TEM/GTEM cell)

author: knudch
author_rank: Regular Contributor
timestamp: January 05, 2022, 10:03:44 am
content: A simple way to get an reasonable idea of transfer function is to place 2 identical probes on top of each other and measure the transfer function, divide by 2Measuring magnetic field strength reliable in xxx MHz range will anyway in practice be challenging
software for HP-33120A generator ? - Page 1
Forum section: electronics / testgear

author: peterp
author_rank: Newbie
timestamp: May 23, 2019, 05:58:57 pm
content: Hi all,I've checked that the HP34811A BenchLink Arb software for this generator is no longer available. Are there newerversions of HP (or other) software that can be used with the 33120A ?

author: chronos42
author_rank: Regular Contributor
timestamp: May 23, 2019, 06:26:32 pm
content: Hi,Do you mean 34811a or 33120a?And for which operation system?For windows I use this softwarebundle with my hp 33120a:A software, called: "FuncGen_25Aug_a.exe". This is the main install software package.You also need the agilent/keysight IOLibSuite with an Agilent USB-GPIB Converter or a NI card with the NI driver. (I am not sure what is necessary for communicatian via serial link)Further there is a plugin for pulses, "WFE_PulseAddin and a pattern editor called PatternEditorInstall_4.0msi".This sofware is rather old, but is still working, even with the latest Windows 10 64bit version.

author: peterp
author_rank: Newbie
timestamp: May 23, 2019, 07:23:04 pm
content: Thanks for the info.I think the 34811a refers to the software that is no longer available.I googled "FuncGen_25Aug_a.exe" ... is it part of the IntuiLink Waveform Editor ?

author: chronos42
author_rank: Regular Contributor
timestamp: May 23, 2019, 07:50:39 pm
content: Hi,I am not 100% sure but I think it was indeed part of IntuiLink Waveform Editor.

author: james_s
author_rank: Super Contributor
timestamp: January 31, 2020, 03:49:54 am
content: I realize this thread is quite old but does anybody have this software posted somewhere? I found one place that claims to have it but they require a credit card number, which is something I refuse to give any company I'm not buying something from.

author: jhenderson0107
author_rank: Regular Contributor
timestamp: January 31, 2020, 03:29:33 pm
content: I believe thishttps://www.keysight.com/main/software.jspx?ckey=1000000918%3Aepsg%3Asud&lc=eng&cc=US&nid=-33002.0.00&id=1000000918%3Aepsg%3Asudis the download you require.

author: icezebra
author_rank: Contributor
timestamp: January 05, 2022, 03:02:33 am
content: Indeed. Thank-you Jim
Rigol MSO5000 FFT diamond numbers - Page 1
Forum section: electronics / testgear

author: Sharp
author_rank: Contributor
timestamp: January 04, 2022, 10:22:08 am
content: Hi guysJust for your info:I have requested Rigol to add the FFT peak number from the search list window to each FFT diamond on the screen, because I need this feature in my work documentation.This is the answer from Rigol:“Hi DearHope you are doing good.Check our website to download the latest firmwareBests,RIGOL INT”So I believe it will be implemented in the next firmware update.
Need help with Finding Test Equipment - Page 1
Forum section: electronics / testgear

author: jonwilhelmjr
author_rank: Regular Contributor
timestamp: January 03, 2022, 10:58:37 pm
content: I need to enlist the help of my fellow engineers. My work is trying to get into higher speed data protocols such as HDMI, USB, and Ethernet. We are in need of equipment to validate our simulations and engineering work. In leu of writing this message i will be working to contact sales reps and suppliers for quotes. The ideal scenario would be to get the equipment that allows us to develop with respect to future protocols but the bean counters in purchasing need the right convincing to justify the purchase. It would be helpful if companies just listed their prices but they don't. I am working compiling a list of possible equipment any help you can give is welcome. I have an immediate need for validating Cat6a 10 Gigibit ethernet and USB 3.2 Superspeed. To further define "validate", Once the boards are made need to verify the trace impedance. The boards may have ic for hub and input to output data rate will need to be tested. I will need eye diagrams as well

author: nctnico
author_rank: Super Contributor
timestamp: January 03, 2022, 11:58:32 pm
content: You don't need eye patterns and that kind of stuff because you don't know whether you are measuring your board or the chip. If you are after board validation (basically checking the stackup and trace width tolerances), a much better way is to add extra traces with the possibility to place an SMA connector. From there you can use a VNA to measure the trace impedance. However, good board simulation software to check board geometries (like Sonnet) is much more useful and yields very accurate results. A measurement on the board itself is only the verify the board manufacturer has adhered to the layer stackup.

author: jonwilhelmjr
author_rank: Regular Contributor
timestamp: January 04, 2022, 12:48:11 am
content: Quote from: nctnico on January 03, 2022, 11:58:32 pmI require validation because the customer requests tested Data proving the design meets spec.
Agilent E5071B ENA repair  - Page 1
Forum section: electronics / testgear

author: BeamDump
author_rank: Contributor
timestamp: January 04, 2022, 06:42:54 am
content: Hello and happy new year everyone.I recently got a hold of an E5071B ENA but the unit's faulty and requires repair.Boots up successfully in to Win2000 and ENA soft starts, with the first error "Power On Test Failed A3 DC-bus, 0x0000003C"Loading the internal tests shows the the fails are in A3 board, all VDET and Rch power gain 50MHz and 3GHz fail, 6GHz passes though. Currently looking in to the A3 vernier board and A1 source board.Service manual wasn't a hard find but it's mostly useless as it describes almost all assembly boards as the problem.I wonder if anyone ran in to this before and has some tips on solving the problem?
FY6800 not send a response to TX if ESP01s wants begin to work -help me please.. - Page 1
Forum section: electronics / testgear

author: HaJo
author_rank: Newbie
timestamp: January 03, 2022, 12:32:24 am
content: The WLAN connection is established via the AP and the client.But there is no bodeplot connection.That's why I specifically checked the signal quality and the levels that go into my FY6800 via RX / TX. The signal levels were not good.After using a levelshifter the ESP-01s TX increased 3.3V to 5V and now OK and the SDS no more hang up.The FY6800 now receives clean signals on the RX input of the FY6800, but does not respond to TX.When I use the USB interface via CH340, the levels are the same and on RX / TX and the FY6800 responds without any problems.What else can I do?- Which FW is on your FY6800?- Do you have a log of the RX / TX data as a CSV log file where I can see functional communication?
Uni-T UTP3303C programmable dual power supply serial not working - Page 1
Forum section: electronics / testgear

author: lightman
author_rank: Contributor
timestamp: January 03, 2022, 04:03:06 pm
content: HelloI have a Unit UTP3303C Programable dual PSUthis one:https://www.uni-trend.com/meters/html/product/gongye/thi/UTP3300C/UTP3303C.htmlI followed the manual instructions to command it via Serial/usb port but no luck:manual:https://www.uni-trend.com/uploadfile/cloud/English%20manual/Benchtop%20Instrument/UTP3000C%20English%20manual.pdfI tried on windows 10 machine with putty, at the recommended speed 9600 N81, no response, also tried 2400,19200,38400.when I plug the USB cable, COM3 shows up in device manager, so something is going on.I know windows 10 is crappy with serial ports so i connect it to the PI400 , also i can see /dev/ttyUSB0 i set with stty and try to control with screen <port>no response whatsoever.so i decide to go serial, grab my really really old serial cable and adapter, and plugged in, i can see showing up /dev/ttyACM0again set with stty and try to control with screen, also send commands with echo 'xxx'>/dev/ttyACM0 nothing.i check voltages in pin 2 (DB9F) coming from the PSU(-6v) against the serial adapter on the pi which is on pin3 (-6V) pin2 (floating) so the connection is correct.I know it's a crappy PSU but is the only programmable PSU i could find in my country (argentina) that doesn't cost 1000 dollars or more! (Lab psus here are highway robbery), i really wanna control the psu via serial portany ideas?, thank you!DL
R&S ZVRE network analyzer usability - Page 1
Forum section: electronics / testgear

author: prutser
author_rank: Regular Contributor
timestamp: January 09, 2022, 07:13:36 pm
content: I have an HP 87xx network analyzer, which goes up to 1.3GHz. I might be able to get an R&S ZVRE which does 4 GHz.Somewhere on this forum I read, if you use this device you throw it out of the window.Is the useability that poor? Any experiences?

author: DaJMasta
author_rank: Super Contributor
timestamp: January 09, 2022, 08:52:09 pm
content: It's not that bad, inputting cal kit data is tedious but it's responsive and fully featured. Takes a bit to boot, is based off of Windows NT, is full length, high, and crammed full of boards so it's quite heavy for a LCD based unit, but it works well enough. I'd put its usability above some of the older Anritsu VNAs, though I've only used a handful of different units.

author: prutser
author_rank: Regular Contributor
timestamp: January 10, 2022, 03:54:51 pm
content: Thanks for the reply, sounds not too bad. Inputting cal data for the Agilent is not easy either (in case you do not have the official CAL kit)

author: prutser
author_rank: Regular Contributor
timestamp: January 10, 2022, 06:58:02 pm
content: By coincedence someone here knows where to get a service manual ? I want to change a 75ohm into a 50ohm :-(
TM5301A GPSDO GPS Disciplined Oscillator - User Manual? - Page 1
Forum section: electronics / testgear

author: jahman
author_rank: Newbie
timestamp: January 02, 2022, 10:06:01 pm
content: Hello!First poster here...Got my TM5301A GPSDO GPS Disciplined Oscillator I bought on Ebay:https://www.ebay.com/itm/TM5301A-GPSDO-GPS-Disciplined-Oscillator-Color-Display-Accuracy-For-GPS-Beidou/174387570327Works great, nice fancy OLED display with all sorts of interesting stats.Except it came pre-configured with UTC+8 for the display time zone, so I'd like to change that to just UTC+0.Alas, I can't seem to find a User Manual on the interwebs describing the appropriate command set.Also when I plug the TM5301A into my laptop via USB, Win 10 says it can't find the driver (a virtual serial port driver, I suspect). Any suggestions?Any assistance much appreciated.Thanks!-jahman.
Rigol DSA815 - Page 1
Forum section: electronics / testgear

author: boful
author_rank: Contributor
timestamp: September 01, 2021, 08:12:55 am
content: Greetings. My Rigol DSA815 Entry Keypad Had Failed. There seems to be some type of coating, graphite, carbon ? on the Rubber Dome type keypads that make contact with the pcb traces. The zero key, reads high resistance across the keypad and not longer works.Does anybody know to to request an replacement Keypad from Rigol or Third Party Repair. I have looked and not find any information.Please. Thanks for any helps..Robert

author: sotos
author_rank: Frequent Contributor
timestamp: September 01, 2021, 08:29:27 am
content: Here you are.https://www.tme.eu/gr/en/details/rc-gumset/computer-accessories-others/ag-termopasty/art-agt-021/

author: boful
author_rank: Contributor
timestamp: September 02, 2021, 04:47:48 am
content: Thanks to the forum for the suggestion for the button repair .. Will give it a try ..Please, after looking around, here is a stateside supplier...https://p1repair.com/universal-button-repairRobert

author: Kartika
author_rank: Regular Contributor
timestamp: January 02, 2022, 09:28:20 pm
content: You can use aluminum or copper .self-adhesive tape, or aluminium from cigarettes glupe up.
RIGOL DSA 815 - Page 1
Forum section: electronics / testgear

author: vk6lv
author_rank: Newbie
timestamp: February 10, 2021, 10:38:45 am
content: I have had this piece of gear for a couple of years and am trying to check the VSWR of my HF dipole. Unfortunately, when I attempt to activate the VSWR function it is 'ghosted' and won't allow me to access the function.Any clues, please.Graeme

author: Kartika
author_rank: Regular Contributor
timestamp: January 02, 2022, 09:24:04 pm
content: https://www.eevblog.com/forum/testgear/spectrum-analyzer-rigol-dsa815/msg3912542/#msg3912542