hybridfree/eevblog-posts huggingface dataset:
Adding Z axis input to a BK 2120B oscilloscope - Page 1
Forum section: electronics / testgear

author: smbaker
author_rank: Regular Contributor
timestamp: October 12, 2021, 02:29:11 am
content: I want to turn my oscilloscope into a Vectrex game. Like usual I blundered forward and built myself a scopetrex, without bothering to check to see if my oscilloscope had a Z-axis input. It does not!So, next step, I want to see if I can modify my oscilloscope, a BK Precision 2120B, to add Z-axis input. I think a binary input (all-on / all-off) is probably sufficient. The scopetrex just needs to be able to blank the electron beam while moving between objects in the display. I found the schematic for a BK 2160, which does support Z-axis input, and I found the schematic for my BK 2120B, which does not. Schematic snippets are attached below. My scope lacks the Z-axis circuit, R801, R804, D807, Q802.So someone please vet me on this approach. All I need to do is add a PNP transistor, base resistor, and a pull up, and I ought to be good. The choice of transistor probably isn't even all that critical -- just something that can handle 24V at about 10mA.Transistors I have easily laying around are the 2N3906 and MPSA92. Either ought to do?Scott

author: smbaker
author_rank: Regular Contributor
timestamp: October 12, 2021, 03:38:43 am
content: Opened the case and realized I wasn't even looking at the right manual. Attached is the right picture for the 2120-B.Two interesting things here, First is a header marked "Z-MOD In" that's not connected to anything. I'm not sure this does what I want though. While it would appear to be Z-Modulation, it's not connected to a transistor driver, and it's AC-coupled through a 4700pF capacitor.The other interesting thing is P650, an unpopulated header marked "BF In". This does run over and (via a 4148 diode) hook up to the base of Q801, which looks like it might blank the beam. Maybe that's where I want to play.Scott

author: james_s
author_rank: Super Contributor
timestamp: October 12, 2021, 07:38:29 am
content: Z-mod is feeding G1 so that will certainly modulate the brightness, however as you have observed it is AC coupled so you won't be able to blank it for any length of time.

author: smbaker
author_rank: Regular Contributor
timestamp: October 12, 2021, 03:32:11 pm
content: I managed to come up with a working solution. I added a 2N3904 NPN transistor. Emitter to ground, 1K resistor and 33K pulldown on the base, and 100 ohm resistor from the collector to the junction of R802/R804 in the 2120B schematic. This successfully blanks the beam, though it is a bit of a hair trigger and I have to ensure the scopetrex's brightness is adjusted "just right", else I either get a display that is too dim, or a display that doesn't blank at all.Scott

author: james_s
author_rank: Super Contributor
timestamp: October 12, 2021, 04:58:11 pm
content: You will probably find that it drifts all over the place if it is that sensitive. The gain of a transistor varies with temperature, but you're on the right track at least.
Can I use the tracking generator as a "RF" signal source? - Page 1
Forum section: electronics / testgear

author: bsodmike
author_rank: Regular Contributor
timestamp: October 12, 2021, 02:20:32 pm
content: Hi all,In a pinch, say I want to generate a 100MHz signal which is outside the abilities of my signal generator, could I take advantage of my 3GHz Spectrum analyzer (with tracking generator)?Thanks!Cheers, M.

author: thinkfat
author_rank: Unknown
timestamp: October 12, 2021, 02:39:28 pm
content: Depends on you SA. If you can set the span to 0, the TG should output a carrier at the center frequency. With some luck it's CW.

author: TheSteve
author_rank: Unknown
timestamp: October 12, 2021, 02:59:16 pm
content: Yes, but expect the RF to be full of harmonics and perhaps spurs, it may even be generated using a square wave. Also the amplitude may vary by frequency quite a bit.
Rigol MSO5000 Bode Plot feature  - Page 1
Forum section: electronics / testgear

author: Sharp
author_rank: Contributor
timestamp: September 29, 2021, 09:07:53 pm
content: Hi guysI hope one of you experienced guys can help me… I’m looking into designing a low pass filer using my Rigol MSO5000 Bode Plot feature for the first time.When I use LTSpice to simulate a LC filter I get a different result compared to my MSO5000.BTW is it right that you only can use the Rigol probes in times 1 and not in times 10 setting ?source 1V, coil: 0.010mH, 0.63 ohm and capacitor: 4,468 uF with ESR 6.2 ohm

author: dustooff
author_rank: Contributor
timestamp: October 11, 2021, 07:35:48 am
content: Hi,can you post your LTspice file, or relevant section of it?Initially I was thinking that the probes in x10 mode wouldn't allow the generator to match impedance correctly, but after that thought percolated for a bit, it didn't really make sense in relation as to how a FRA setup needs to be implemented.The chapter 19 in the MSO5k user manual doesn't give much info about exactly how to connect the generator to the circuit under test, with the 'tips' picture showing a coupling transformer to impress the sweep signal on the test circuit. Just a suggestion of some type of pulse transformer, but I've also seen power amp modules for inclusion into bode measurement setups.Some vids on FRA implementation by cleverscope give a reasonable overview.This is a feature I'm trying to get more familiar with on my testbench.
Keysight U1233A VS Fluke 117 - Page 1
Forum section: electronics / testgear

author: ErlsnWu
author_rank: Newbie
timestamp: October 10, 2021, 02:45:59 pm
content: Hi guys, I'm looking for a new multimeter.My option is U1233A, 117, I like Keysight, but I'm not very sure about their multimeter.(Only use their oscilloscopes before)It will be use at video game console(or sort of device) repairing and restoration.Also I will do some electrical work for my family too, so I'm trying to get the "balance" multimeter.Are these two great option for my work?, and are they worth for the price?Thanks!

author: Fungus
author_rank: Super Contributor
timestamp: October 10, 2021, 04:30:30 pm
content: I'd get a Brymen long before I got either of those - just as good and much better value for money.They're made in Taiwan so they should be easy for you to find.The new BM789 is very good:https://brymenmeter.com/brymen-bm789-multimeter.html

author: rodpp
author_rank: Frequent Contributor
timestamp: October 10, 2021, 07:45:46 pm
content: I have a 117 and it's a solid, robust multimeter, long battery life, very good for electrical maintenance. But it lacks uA measurements, and for electronics maintenance it may be necessary.

author: tooki
author_rank: Super Contributor
timestamp: October 11, 2021, 01:13:13 am
content: The Keysight handheld meters just aren’t as good as their brand name and price might suggest. I grab my Fluke 87V over my (theoretically superior in almost every spec) Keysight U1252B almost every time.I’d go for a Fluke or a Brymen.

author: J-R
author_rank: Super Contributor
timestamp: October 11, 2021, 05:27:47 am
content: There are some relatively respected Keysight handheld DMMs, but the U1233A is probably not one of them. Only 6,600 count and doesn't have a mA range. If you feed it any DCA value between 660.01uA and 1mA it simply cannot display it. Backlight is an abysmally dark orange...
Teseq Schaffner Chase DIN Connector 8 pin Identity - Page 1
Forum section: electronics / testgear

author: charliedelta
author_rank: Regular Contributor
timestamp: October 14, 2021, 08:47:16 am
content: I am trying to identify this type of din connector1. 8 pin 270 degree type2. 3 locking ball bearings 120 degrees apart3. insertion groove at 9 o'clock and 3 o'clockIts on a Chase/Schaffner/teseq HLA6120 loop antenna. I dont want to change the connectors. It looks like a mil-bayonet DIN connector. Anyone have any ideas?Pics attached.Thanks

author: reboots
author_rank: Regular Contributor
timestamp: October 14, 2021, 04:55:45 pm
content: There are several bayonet-lock DIN connectors out there, but they generally seem to be flange-lock. (Switchcraft example.) I could not find a variant with three locking detents.Have you tried contacting Ametek/Teseq for details on the cable/connector, or a lead on a source?https://www.ametek-cts.com/support/service-support-request
Looking for information:  Narda 7000A Microwave Multimeter - Page 1
Forum section: electronics / testgear

author: Stray Electron
author_rank: Super Contributor
timestamp: October 08, 2021, 01:54:28 pm
content: I rescued this from a scrap pile yesterday and it powers up and appears to work. Does anyone know more about it or have instructions for it? I found very little online.Main unit: Narda 7000A Microwave MultimeterSecond unit: Narda 7134 Microwave Unit 4.0 to 4.5 GHzSensor: Narda 212631 .01 to 18 GHz.Does this mean that the meter is good to 18 GHz? And exactly what does the 2nd unit do?

author: kbrill
author_rank: Contributor
timestamp: October 10, 2021, 06:43:05 pm
content: I have a couple of Narda 7000a units in storage along with the instruction manual . Have not attempted to use eitherI was unable to locate any any online information yesterday at any of the free download sites I searched atIf no one else responds with scanned manuals etc I will dig the documentation out and see if I can send you at least the specification , option and module information . While the manual is in loose leaf format I do not have a scanner with automatic document feed let alone a double sided ADF .If no useful responses are forthcoming from others contact me
How to clone an Agilent 8960 (E5515C) Hard Disk (VxWorks partition) - Page 1
Forum section: electronics / testgear

author: tabajaralabs
author_rank: Regular Contributor
timestamp: October 10, 2021, 05:12:11 am
content: Hi all!I just got an Agilent 8960 (E5515C) and it is working flawlessly.This device runs VxWorks, and has a 20GB HD. I tried to clone it today using DD and I wasn't able to make a workable clone.Tried Clonezilla, GParted, DD. Clonezilla and GParted cannot even see the HDD Partition. DD generates an image of the disk. I can see data on the IMG file, although byteswapped...probably because it is targeted to a motorola processor...but DDing it back to a completely equal HDD, same model, taken from another 8960 doesn't work. It doesn't load even the first file.This is not a hurry, but it would be nice to have a tried, working image of the software of this device. Unfortunately I wasn't able to find a way to regenerate (reignite, as HP says =D) a working HDD for it.Any tips? Seems I hit a brickwall here. Thanks!

author: khach
author_rank: Contributor
timestamp: October 10, 2021, 07:51:56 am
content: VxWorks HDD at E5515C has different endians (big-endian or little-endian) than PC. Try to use WinHex in binary mode to make HDD image then swap bytes to read image as file system.

author: _Wim_
author_rank: Super Contributor
timestamp: October 10, 2021, 08:19:07 am
content: I always had good luck with this one:https://hddguru.com/software/HDD-Raw-Copy-Tool/Free, and a "portable" version available, so no installation required.

author: tv84
author_rank: Super Contributor
timestamp: October 10, 2021, 08:51:17 am
content: Quote from: khach on October 10, 2021, 07:51:56 amWhen doing a disk cloning, it's irrelevant the endianness of the OS involved.

author: tabajaralabs
author_rank: Regular Contributor
timestamp: October 10, 2021, 12:53:25 pm
content: Problem solved, although I don't know what happenedOn the third try - NOT PIPING THE IMAGE TO GZIP - it worked flawlessly. The 8960 is working with the new HD =)Thanks all!

author: tabajaralabs
author_rank: Regular Contributor
timestamp: October 10, 2021, 12:57:10 pm
content: A resume if someone needs that on futureI succefully cloned the HDD on the 8960 with a live linux bot and DD.I connected the HDD to a notebook using a cheap PATA to USB converter, DDed the HD to an .IMG file **without using GZIP to compress it**, connected the new HDD and DDed the .IMG to the HDD. Nothing special, it was cloned perfectly.Since there is no tool to reignite the 8960 HDD (or at least I wasn't able to find it) I believe this is good info to have stored hereThanks all!(now...how to unlock licenses...hehe)
Appa 503 non-zero - Calibration Software(Aka Voltcraft 930/950, IDM503/505 etc)  - Page 1
Forum section: electronics / testgear

author: Bakaman
author_rank: Contributor
timestamp: October 09, 2021, 10:21:17 am
content: Hi Folks,I've bought a handy 40,000 count meter which does offline datalogging. It floats my boat, and I bought it complete with USB lead and software from the bay.The trouble, is, it has a dc offset problem, just a small one but significant enough to be a problem, e.g. on a low voltage 0.283VDC (Fluke), I get either 0.24 or 0.33V by reversing the leads on this one , which is a shame. With leads shorted I get a small offset on DCV, ACV, and DC+AC. The offset is on the lowest 4V range, There is no offset on the mV range. Perhaps I'm expecting too much of a lowish-priced 40,000 meter.The offset reduces as the meter gets warm, down to +/- 8mV after say 30 mins. Maybe I'm being unreasonable, and just need to accept that this particular meter has a longer warmup time than I'm used to? I can live with that, as long as it doesn't get worse or permanent, I just don't know if this is 'normal'. Thoughts welcome please.In the manual is says 'self calibration via software'. Great stuff, except it doesn't say which software, and guess what's not on the CD. Does anyone know of a source for this software? I've seen another post referring to Calwin300, but my meter looks like a completely different series, and I don't want to waste my time on that. I won't attempt to adjust anything until I know whether this just a warmup issue or a definite permanent offset which shouldn't be there when it is warm.The meter is known variously as an Appa 503/505 or IsoTech IDM503/505 or Voltcraft VC930/950 or Ideal 61-498 multi-branded variants.(there is a separate thread that I will raise re meter fluctuation and whether it is normal/acceptable - but I'll keep that separate for simpicity)Note.
Siglent Retail in Australia - Page 1
Forum section: electronics / testgear

author: bill53
author_rank: Contributor
timestamp: October 07, 2021, 12:15:46 pm
content: This is a question for Australian based members.I'm about to place an order for some Siglent equipment. Are there any Australian retailers who offer discounts to EEV members?Have any of you purchased from a company called APPVISION based in Hornsby, NSW? Thanks.Cheers Bill

author: lowimpedance
author_rank: Super Contributor
timestamp: October 08, 2021, 12:14:19 am
content: I thought triotest and measurement (IPD) were the agents for Siglent, perhaps try them first, they might give a discount !.Haven't heard of APPVISION though, perhaps grey market ?, certainly cheaper, however what happens with warranty !.

author: bill53
author_rank: Contributor
timestamp: October 08, 2021, 12:59:38 am
content: Thanks,Yes not sure if this is grey seller. That's why I asked.Just sent a quote request to triotest.Thanks Bill

author: RoGeorge
author_rank: Super Contributor
timestamp: October 08, 2021, 01:06:54 am
content: You may also want to talk withtautechuser from this forum.

author: tautech
author_rank: Super Contributor
timestamp: October 08, 2021, 01:35:15 am
content: Yawn.https://int.siglent.com/map/i-563/

author: lowimpedance
author_rank: Super Contributor
timestamp: October 08, 2021, 02:38:49 am
content: well there you go, forget trio then.

author: tautech
author_rank: Super Contributor
timestamp: October 08, 2021, 06:38:42 am
content: Quote from: lowimpedance on October 08, 2021, 02:38:49 amTriotest are still operating under their own identity despite IPD ownership.https://www.triotest.com.au/brands/siglentOf their 3 founders only 1 is still working now in IPD and Charles that used to run units to Dave for review has retired and the other chap has passed.

author: wolfy007
author_rank: Frequent Contributor
timestamp: October 08, 2021, 05:23:07 pm
content: I gave up on TrioTest after IPD took over. Last couple items I purchased from AppVision, they were helpful, responsive, cheaper and timely, so Im going to stick with them now.PS: Also AppVision is a proper Siglent reseller, they also do MicSig gear and a few other brands of equipment.PPS: Oops Tautech already linked reseller status from Siglent link.

author: tautech
author_rank: Super Contributor
timestamp: October 08, 2021, 11:06:02 pm
content: Quote from: wolfy007 on October 08, 2021, 05:23:07 pmTrio certainly had some issues in the past and some are explained here and in the following post:https://www.eevblog.com/forum/testgear/where-to-buy-the-siglent-sds1202x-in-asutralia/msg2728830/#msg2728830QuoteWavecom are another that might be worth checking out.https://www.wavecom.com.au/products.php?search_field=Siglent
Multimeter HC6000  - Page 1
Forum section: electronics / testgear

author: The best_xp
author_rank: Newbie
timestamp: September 26, 2021, 07:27:44 pm
content: Hello ...I have a digital multimeter HC6000, and I think it's from Hung chang. And recently fall broken.If any one has its schematic, or manual, please post it - or send it to me - .Thanks

author: The best_xp
author_rank: Newbie
timestamp: October 02, 2021, 07:57:28 pm
content: Hi guys ...Any schematic, or manual ?On it marked : eurochannels, I think this is it's manufacturer.

author: floobydust
author_rank: Super Contributor
timestamp: October 03, 2021, 02:48:44 am
content: Hung Chang, they are a Korean OEM that made the multimeter for many brand names.It looks like a Voltcraft 6010. Schematic for that is here:https://www.eevblog.com/forum/testgear/voltcraft-6010-(nos-from-1984)-unboxing-and-teardown-(picture-heavy)/Hung Chang HC-601 is similar- but no 10A or 20A 4th terminal.

author: The best_xp
author_rank: Newbie
timestamp: October 08, 2021, 07:35:40 pm
content: Hi ... thanks a lot.
OCXO for HP 53xx Series  - Page 1
Forum section: electronics / testgear

author: VK2RK
author_rank: Newbie
timestamp: October 08, 2021, 07:31:42 pm
content: I have designed a replacement OCXO for the HP5384A, 5385A, and 5386AMy approach differs from some, the use of standard components to keep the cost low aside from a constant voltage reference.The design offers a fine frequency adjuster that resides at the rear panel provided oscillator adjust hole.PCB are available as are complete Oscillatorvk2acr@aussiebb.com.au
what is the consensus on these digitizing scopes? - Page 1
Forum section: electronics / testgear

author: playboy_shrek
author_rank: Contributor
timestamp: October 07, 2021, 05:49:05 am
content: from browing old threads its a bit of a mixed bag some hate and some like them. they look really cool to me because the CRT screen just looks much nicer than the low quality stuff in older scopes and even lower end ones.do you recommend them and which are good? currently I can get a Hewlett Packard HP 54503A for about 200 shipped to me

author: oPossum
author_rank: Super Contributor
timestamp: October 07, 2021, 09:23:34 am
content: I have several old HP DSOs and they are still very useful tools. I hesitate to recommend them simply because they are old and something will eventually fail that may or may not be practical or possible to fix.I wouldn't recommend going older than the second generation Megazoom (5462x series). They usually can be found for about $150 with a bit of searching and patience. Would not recommend getting that 54503 unless is was free or close to it.My  collection...

author: Stray Electron
author_rank: Super Contributor
timestamp: October 07, 2021, 12:10:58 pm
content: make sure all of the channels are working BEFORE you buy it! I would also have the seller run it for 24 hours or so to see if any of the caps are on the verge of failing. Also are the probes included and do they have all of the parts needed (tips, grabbers, ground leads) to use? A decent set of four probes are probably worth close to $200. You don't say where you are so I can't say if that's a good price in your area. But around the US the scopes alone aren't worth more than about $30. I have a 54510A that I bought for $30 about 6 years ago and it still works well and I do like the LARGE screen.

author: David Hess
author_rank: Super Contributor
timestamp: October 08, 2021, 03:11:11 am
content: I would not recommend them for general purpose work because they lack peak detection. Typically that kind of bandwidth (500 MHz) combined with low sample rate (20 Msamples/second) would be suitable for applications like semiconductor characterization where aliasing is not a consideration.

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: October 08, 2021, 03:44:55 pm
content: Quote from: Stray Electron on October 07, 2021, 12:10:58 pmThat statementmakes me envy-green and starting to cry over the low prices in the US compared to the surplus market prices in Europe...But, you have heard that before so I'd better stop before you are getting bored...Cheers,THDplusN_bad
Buy DS1202Z-E ? - Page 1
Forum section: electronics / testgear

author: Jan Audio
author_rank: Frequent Contributor
timestamp: October 08, 2021, 02:35:06 pm
content: Hi, any reason not to buy a Rigol DS1202Z-E ?Is it better then the DS1054Z if you compare the FFT and other functions,or is the processor the same slow thing ?Looking nice as first digital scope.

author: Fungus
author_rank: Super Contributor
timestamp: October 08, 2021, 02:47:48 pm
content: Quote from: Jan Audio on October 08, 2021, 02:35:06 pmNo.Quote from: Jan Audio on October 08, 2021, 02:35:06 pmI believe it's exactly the same as the DS1054Z except 2 channels/200Mhz and external trigger input (the 'E' in the name).

author: Jan Audio
author_rank: Frequent Contributor
timestamp: October 08, 2021, 02:49:46 pm
content: Ah forget it then, i dont want it.
HoldPeack HP-990B stress fractures - Page 1
Forum section: electronics / testgear

author: shved
author_rank: Regular Contributor
timestamp: October 07, 2021, 03:19:07 pm
content: Recently I've had some intermittent problems with my HoldPeack HP-990B SMD METER. The PCB copper stress fractures formed next to the pad where the tweezers connect to the board. The board in too thin and not rigid enough - so it bends and eventually stuff breaks. Anyway, I've scraped some resist of the problem trace and soldered reinforcement to the trace.

author: AndrewBCN
author_rank: Frequent Contributor
timestamp: October 07, 2021, 09:35:29 pm
content: Hi,Perhaps you could post some pictures of the PCB, specifically where the stress fractures occurred and where you soldered the reinforcements?

author: shved
author_rank: Regular Contributor
timestamp: October 07, 2021, 11:52:50 pm
content: I don't have a good macro camera, unfortunately.Anyway, the damage is impossible to see with a naked eye. Only when I've buzzed it out with another meter - I was sure.To reinforce the broken trace - clean the resist of the track next to bottom tweezer ( if viewed dead on, with digits the right way) and solder a reinforcing bridge(pad to trace).Hope that helped.
Rigol DS1000E PC application - Page 1
Forum section: electronics / testgear

author: ArnoudvR
author_rank: Newbie
timestamp: October 15, 2021, 01:51:17 pm
content: Hi,I have a Rigol DS1000E series scope and found there are little applications that can work with the scope. So I wrote my own.Are there more people out there that are interested in this? Below are some screenshots for what I have done sofar..Functionality:- Scope- Logic Analyzer- Save waveforms- Scope screen (with save of scope screenshot)- Measurements screen- Most trigger types accept Alternate is not yet added- Delayed timebase (might not be possible on the bus to get the full waveform)Work in progress:- Protocol anaylzers for LogicAnalyzer data (With the aid of OLS fromhttps://lxtreme.nl/projects/ols/)Everything is written in Python and tested under Linux, should be possible in Windows though..If there is enough people who loves this I will upload an executable for Linux. Windows will follow after I can test it.
HoldPeack HP890CN magic shmoo - Page 1
Forum section: electronics / testgear

author: shved
author_rank: Regular Contributor
timestamp: October 07, 2021, 02:57:13 pm
content: I've had a problem with HoldPeak HP890CN intermittently breaking the contact in some modes. The PCB tracks that are used by the switch were coated in some Vaseline type shit. Anyway, after long washing with isopropyl alcohol - problem solved.
SIGLENT SDG2042 - Using internal Waveforms - Page 1
Forum section: electronics / testgear

author: Clint
author_rank: Regular Contributor
timestamp: October 06, 2021, 10:56:39 am
content: Hi all new user to the SDG and I have found I am stumped on something that I would think was easy, probably me but I have spent a lot of time trying to work this out.I want to use a built in waveform, I want to send the same waveform on channel 2 but only after every 6th pulse in an 8 pulse cycle on Channel 1.So like:CH1 = 11111111CH2 - 00000010I thought I could upload the built in wave form to the software, copy it 8 time and then do the same and flat line the ones I want left out on channel 2, however I cant seem to copy and paste the original waveform into a new waveform....(Also anyone else notice some on the waveforms are not the right ones then you download them to the PC)Anyone got an insight into how to do this ?

author: tautech
author_rank: Super Contributor
timestamp: October 06, 2021, 11:08:41 am
content: Use Burst, N # of cycles and internal trigger. You can also set it running from a manual trigger.Spend some time crashing around in the menus and it will all come together.

author: tautech
author_rank: Super Contributor
timestamp: October 07, 2021, 07:48:56 am
content: Had a little time to play with this…..You need use either clock synced channels with the 2nd using a phase delay or tee the output of the master channel and have it trigger the 2nd channel although you must have more than 2V to trigger the AuxIn to fire the 2nd channel.But it won’t do this simply by triggering the 2nd channel after N # of cycles so a delay needs be added to time with the 6th pulse.Maybe it can be done with SCPI but beyond my ability.BTW which SW were you using ? EasywaveX ?

author: Clint
author_rank: Regular Contributor
timestamp: October 07, 2021, 09:28:07 am
content: Hi thanks for trying, yes Easywave X v 1.1.0.13 - is there any other software ?I am trying to replicate a VR sensor in a belt timing scenario, so using the built in Dlorentz waveform.Ideally need Chanel 2 to follow Chanel 1, I actually asked if this could do this before I purchased so I may need to send back and purchase a better generator.
My first impression of RD6018 power supply - Page 1
Forum section: electronics / testgear

author: ElectricPower
author_rank: Frequent Contributor
timestamp: October 07, 2021, 03:35:50 am
content: A few days ago I received RD6018 in the mail when I needed one more accurate power supply for my electronic works.I have heard some rumors regarding fan noise with these units so I bought the biggest one they had so that I could manage with moderate load without the noise from the fans. I do not have a large enough load to be able to fully test the RD6018, but I can draw up to 150 watts for short periods without the fan breaking the silence. For the most part, I rarely use more than 10-30 watts and then it is completely silent.For daily use, I never hear the fan turn on and even at 150 watts load over time, it is very quiet.When i tried to set the current limit on this and my old power supply to 10mA and set it to 12V for powering a tiny 5mm LED diode, i got these meassurings when i turned on/off the power.My old Power Supply:My new power supply (RD6018):
What probes are compatible with an HP/Agilent 54645D? - Page 1
Forum section: electronics / testgear

author: Danny R.
author_rank: Newbie
timestamp: September 24, 2021, 05:00:31 am
content: Hello!I have found this forum recently, and honestly wish I found it sooner, but I'm very excited to explore electronics more seriously and with some help from the very knowledgeable people here. So here's to that!The first thing I would like some help on is finding passive probes for my new oscilloscope (an HP/Agilent 54645D). I have no idea as to what would be compatible if I were to order new probes, or what people use for those that have the same line, but I'm just trying to get the best "bang for the buck" before I buy secondhand probes that came standard with the scope.Thanks ahead of time!

author: nctnico
author_rank: Super Contributor
timestamp: September 24, 2021, 10:44:16 am
content: Any standard passive probe will do. Look at the ones from Testec. Stay clear from second hand passive probes; these usually are broken. Do yourself a favour and consider passive probes consumables. Buying such probes second hand is like buying used underwear.One thing to watch out for is that the probe has enough compensation range. Every oscilloscope has an input capacitance and every passive probe has an adjustment range. For example: if a scope has an input capacitance of 15pf then the probe should have an adjustment range that covers 15pf (from 5pf to 20pf for example).

author: tooki
author_rank: Super Contributor
timestamp: September 25, 2021, 03:48:41 pm
content: +1 for testec probes, they’re nice.FWIW, the Keysight N2140A probes (the ones included with their low end scopes, which is how I’ve used them) are also nice and don’t cost a fortune, about $85 for a two-pack. They’re standard 10:1/1:1 switchable.I also like the Tektronix TPP0100 (about $60 apiece).I actually have come to prefer fixed 10:1 probes, like testec TT-LF 212 (about $25 apiece).

author: richmit
author_rank: Contributor
timestamp: September 25, 2021, 08:35:18 pm
content: I think my 54645D had 15pF input capacitance -- it should be printed on the front of your scope right by the inputs.I have been using Probemaster 4900 Oscilloscope Probe recently, and have been happy with them. The compensation range is 10pf-50pf, so they will probably work.

author: Danny R.
author_rank: Newbie
timestamp: October 06, 2021, 05:20:13 am
content: Thank you all for the inputs!I ordered and have received a set of Testec LF-212s. I just "tuned" them and they read well and feel nice, definitely worth the money and looking forward to all the fun to be had with them.As a note for future reference, I found these probes on Newark for about $35 each. Minimal noise even at the 50 mV division setting with a ~4.5mV error margin (plus or minus). For the signals I'd be reading I think that'll be more than sufficient.
10 MHz Rubidium OCXO frequency standard information  - Page 1
Forum section: electronics / testgear

author: Redcat2
author_rank: Newbie
timestamp: September 02, 2021, 11:27:43 am
content: Hello to all, I bought used an AR-60A (AccuBeat) and a Datum LPRO (I think it's from Efratom) and they both work. I have no experience with these Rubidium frequency standards and would like clarification regarding the optimal operating temperature, i.e. if they need a heatsink and how large it should be (or how many ° C / W). Currently without the heat sink the temperature rises to about 50 ° C then stabilizes.Thanks for the attention.-- CheersAttilio

author: rf-loop
author_rank: Super Contributor
timestamp: September 02, 2021, 12:31:24 pm
content: Eftaron, Datum, Symmetricom all same.Official manual and unofficial service manuals are good for read. All needed info is there.Just DO NOT adjust freq until you have enough real accuracy for do it. Typically after many years they are still mostly inside +/-10mHz (milli Hz).And keep it away from very strong magnets!Cooling, well this kind of Rb physics, there inside, need run very hot, and there is not thermal isolation and it need some heatsink. Read LPRO manual: 3.2 Thermal Considerations. There is everything you need know about cooling, and perfectly.Aklo other paragraphs are important, mandatory to read every word.These famous 4 letters... RTFM.Unofficial repair manualDatum LPRO-101 manual. (just as Efratom)

author: Redcat2
author_rank: Newbie
timestamp: September 02, 2021, 01:21:21 pm
content: Thanks rf-loop.Then as I thought it takes a heat sink.-- CheersAttilio

author: Johnny B Good
author_rank: Frequent Contributor
timestamp: October 07, 2021, 08:17:41 pm
content: I'm only 5 weeks late to the party this timeThis posting I made about 5 weeks ago :-https://www.eevblog.com/forum/blog/eevblog-235-rubidium-frequency-standard/msg3652885/#msg3652885should point you in the right direction as far reducing the Rb oscillator's drift with temperature (and barometric pressure) if you want to get the best stability possible out of your Rb oscillator investment.
Fluke 32x series vs 37x series clamp meter. - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: October 04, 2021, 01:52:09 pm
content: Our company bought only the 37x series from the 374FC up to the 378. I think they are better than the 32x series but one thing though the 325 has a 40A range with 2 digits after the decimal point. While the 37x series only have 1 range which is either 400A or 600A which has only 1 digit after the decimal point. I wonder why Fluke does this. I found the extra digit is useful when I measure something only a few amps.
Help finding Rigol ds1052e lcd datasheet - Page 1
Forum section: electronics / testgear

author: exider
author_rank: Contributor
timestamp: October 04, 2021, 09:09:52 pm
content: Hi everyone,Can someone help in finding datasheet for the ds1052e lcd display? I searched everywhere and could not find anything.The part number is :59.05A03.020Thanks in advance!
Talking Digital Multimeter - Page 1
Forum section: electronics / testgear

author: jonovid
author_rank: Super Contributor
timestamp: October 04, 2021, 03:26:49 am
content: recently seen a yt video by Big CliveHow to use your trashy meter without blowing it up (much)so I got to thinking about continuity beeps, and if a multimeter could do more then just beep?would talking also help?so I went looking for a talking digital multimeter to see if anyone made one. see video.a talk Volume setting & a wireless foot pedal could help in particular situations IMO.be interesting to know if a talking DMM is a truekeep your eyes on the jobdevice, or just agimmick.can it help workplace ergonomics with repetitive DMM testing tasks.maybe Dave needs one in His mailbag?
Rigol DSA 815-TG vs Rigol DSA832E with TG - Page 1
Forum section: electronics / testgear

author: spongella
author_rank: Contributor
timestamp: October 06, 2021, 01:08:07 pm
content: Am trying to decide which of the above to purchase and would like your opinion. Is there any advantage in getting the 3.2 GHz model over the 1.5? For the test bench I'd think the 815 (with the TG) would be the best choice for routine testing of HF/VHF/UHF radios and the cost is much less too. Thank you.

author: Bicurico
author_rank: Super Contributor
timestamp: October 06, 2021, 01:21:47 pm
content: 1) The bigger the supported frequency range, the better! Note that many useful measurements incide on harmonics. If you are measuring a DUT at 700MHz, you may be interested to take a look at the 3rd or 4th harmonics - 2.1GHz and 2.8GHz. A spectrum analyzer that only reaches 1.5GHz may be limited - ultimately it really depends on your desired applications. Of course, if you are just into HF/VHF/UHF radios, then 1.5GHz might be more than enough.2) Why go Rigol? You can purchase the Siglent SSA3021XPlus and then hack it into a SVA1032 - a full feaured SA/VNA up to 3.2GHz, at around 1.500 Euro (+VAT).Regards,Vitor
Help needed to find a solution for current probe use on PCB. - Page 1
Forum section: electronics / testgear

author: Numex106
author_rank: Newbie
timestamp: October 02, 2021, 05:52:03 pm
content: I have a Tek TCP0030 current clamphttps://www.tek.com/datasheet/30-ac-dc-current-probeand I'm looking for a solution so I can clamp it onto the PCB. There are about 10 traces (~5-10A) I need to measure, so I'm looking for a solution that's somewhat neat. Has anyone had to do this and what did you use?There isn't enough space on my PCB to line up all the traces along the edge of the PCB and route out a slot like the Tek de-skew test fixture (see attached image).I also can't seem to find pre-bent wire shunts similar to this.https://kyxding888.en.made-in-china.com/product/WymJKIFOkwct/China-Current-Sensing-Resistor-Jumper-Wire-Milliohm-Resistor.htmlThe closest I found were these shunt jumpers made by Keystone, but none of them are large enough to fit around the current probe.https://www.digikey.ca/en/products/detail/keystone-electronics/5100TR/4759687If all else fails, I guess I could just bend a solid copper wire and form it myself, but ideally I'd like something off the shelf and pre-bent and as I may need to make a lot of these PCBs (~30 PCBs * 10 jumpers/PCB = 300 jumpers).Any help is appreciated, thanks!!

author: Kean
author_rank: Unknown
timestamp: October 02, 2021, 06:21:15 pm
content: Maybe a Stackpole BR3 or BR5 series in 5mOhm or 10mOhmhttps://www.digikey.ca/en/products/detail/stackpole-electronics-inc/BR3FB10L0/2075822Similar options are available from other manufacturers - search for low value through hole resistors on Digikey

author: DaJMasta
author_rank: Super Contributor
timestamp: October 02, 2021, 07:14:31 pm
content: Do you have space to rout out slots on either side of the traces that need measurement and just clamp around the trace through the board? Probably easiest if the trace is on the edge of the board, as then you only need a single slot.

author: Howardlong
author_rank: Super Contributor
timestamp: October 02, 2021, 07:41:42 pm
content: Depending on what your measuring and how accurate you need it, the TTi I-prober 520 might work for you. You hold the probe on the trace, no need for any access loops or current shunt resistors.I've had one for some years, mostly it sits gathering dust, but it comes in handy on occasion.Note that its readings are affected by external magnetic fields, including the earth's which shows up as a DC offset, so you need to calibrate that out when using it.

author: Numex106
author_rank: Newbie
timestamp: October 02, 2021, 11:07:56 pm
content: Wow, those look perfect. Indeed I see a few other manufacturers have similar offerings. Thank you so much, I think one of those will do the trick!

author: Numex106
author_rank: Newbie
timestamp: October 02, 2021, 11:09:08 pm
content: Thanks, I've never used one of those before, but I'll keep it in mind for the future!
Manufacturers of oscilloscope probes that manufacture "made to oder" (lenght) - Page 1
Forum section: electronics / testgear

author: merox
author_rank: Regular Contributor
timestamp: October 01, 2021, 09:16:14 pm
content: Hello Community,I'm sorry if my english is not that good (I'm german), but I'm looking for a manufacturer of oscilloscope probes that manufactures them kind of "built to order".I'm situated in germany and till now we bought our high voltage (they need to be capable of measuring at least 10kV) oscilloscope-probes (1000:1) from the company PMK, to be precise the PMK 4002 series:https://www.datatec.de/media/pdf/04/3f/ae/37162eb6-b1fa-4fd1-8d21-5d6e90528bf7_864-023-003_1_dKdiT9bWvF9rrY.pdfThey were always open to all our wishes regarding cable length and all our other special withes. Unfortunately PMK discontinued that series and there is no replacement available from them.We use those probes in test fixtures and have the probe itself placed inside in the fixture which then connects to a "wall-feed-through" (BNC female to female) which then connects to a cable which includes the "adjustment box"(I hope it's clear what I mean :-(, don't know the correct name).Does anyone know a probe manufacturer that makes them built to oder like our old manufacturer PMK did or has a tip for me whom to ask?
Product search:  Is there such a thing as a scope probe-to-BNC analog converter? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: September 30, 2021, 02:44:37 pm
content: Hi all-I would like to use oscilloscope probes as the input to audio analysis gear. I'm looking for something that will properly terminate scope probes (including overload protection hopefully), and output BNC analog.Does such a box exist? My Google-fu is failing to find even one such device. Thanks!

author: Yansi
author_rank: Super Contributor
timestamp: September 30, 2021, 02:46:27 pm
content: Well, for audio frequencies, just slap there a FET buffer opamp, done**I know itmaynotbe that easy, but we did not get too much details what are you trying to do with this.

author: tszaboo
author_rank: Super Contributor
timestamp: September 30, 2021, 02:53:45 pm
content: Sure, this thing:https://www.newark.com/keysight-technologies/5081-7705/test-probe/dp/02P5581This one is not in stock, but im sure you find it somewhere else.Also, KS scopes come with them default.

author: edavid
author_rank: Super Contributor
timestamp: September 30, 2021, 02:58:35 pm
content: Quote from: cvanc on September 30, 2021, 02:44:37 pmSort of! They are usually called differential probes, and of course they have the probe built in. In the vintage world, you could also use a differential preamp like the Tek AM502 (or ADA400 if you got lucky) or a FET probe like the P6202 to do the job.The problem you might run into is that most oscilloscope accessories are not specified for THD, so you would have to measure that yourself.
Agilent N2890A Oscilloscope Probe compensation - Page 1
Forum section: electronics / testgear

author: eb4eqa
author_rank: Regular Contributor
timestamp: January 06, 2020, 11:09:24 am
content: Hi all and Happy New Year !The instructions to adjust the probe compensation (https://manualzz.com/doc/9046234/n2862b-n2863b-n2889a-n2890a-passive-probes-data-sheet-cha...) show only two trimmers for the HF compensation, but the body with the BNC connector has three. If you dare to open the case, you find two more...I understand there should be no reason to touch the ones inaccessible from outside, but the other three are probably behind a hole for a good reason. Now, the two on the sides have a clear effect, as explained in the instructions, but the one in the middle has no effect that I can find.I haven't find much information about this three-trimmer probe on internet, but someone from Asia has been playing with them, even drew a schematic:http://www.360doc.com/content/17/1010/19/42387867_693844724.shtmlThe information I found on the internet regarding probe compensation seems to be more basic than this scheme. It would be great to understand what all those trimmers are there for. Does anyone know?Regards,Roberto EB4EQA

author: David Hess
author_rank: Super Contributor
timestamp: January 06, 2020, 04:59:13 pm
content: That looks like a probe OEMed by TEXAS.The other compensation adjustments are for high frequencies. If you did not see an effect when adjusting them, then it was because your signal source or oscilloscope was not fast enough.Higher frequency high impedance inputs, like 250 MHz and higher, require high frequency compensation in the probe to compensate for non-ideal behavior of the high impedance input. You might have noticed that Tektronix will release a new series of probes with the same bandwidth when they release a new oscilloscope series. The reason for this is that the new probes have different high frequency compensation for the new oscilloscopes.

author: eb4eqa
author_rank: Regular Contributor
timestamp: January 06, 2020, 06:32:26 pm
content: Hi David,You are right. A few minutes searching and I found this Agilent N2890A probes are exactly the same as the Texas TX6250. Even the accessories supplied are exactly the same ones. I hope to find more info regarding how to adjust that following that path.Thanks!Roberto EB4EQA

author: lastguy
author_rank: Contributor
timestamp: October 01, 2021, 02:25:37 am
content: Quote from: eb4eqa on January 06, 2020, 11:09:24 amMay I know the schematic is for which probe? Most are now 10:1 so there would be a 9 Mohm resistor yet it is not shown in your circuit? Do you still keep 360doc schematics can be posted here?I wonder whether 10:1 15)M can be rework to 350M?
homemade SMA cable pin recession - Page 1
Forum section: electronics / testgear

author: electrolust
author_rank: Unknown
timestamp: July 25, 2021, 12:35:42 am
content: I'm making my own SMA patch cables. The connectors are solder on. It's very hard to get the pin depth correct. The standard is 10 mils. Am I correct in thinking that this isn't actually super critical, as long as the pin is recessed and not processed? If the pin is processed, the pin base may interfere with the female socket. If the pin is overly recessed (say 15-20 mils) then physically you just have that much less contact in the socket. Maybe you can't get up to 18Ghz because of the extra dielectric "gap" but for lower frequencies 1-2 GHz I mean this should be fine? All the chinacom commercially made cables I have are waaaay worse than my hand-made ones and they perform fine.Even if I can get one connector correct, I then have to keep cutting and re-doing the other end until I get that side correct. And those connectors are damn pricey.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: July 25, 2021, 02:40:16 am
content: Yep, that's correct. At 2GHz you can get away with just about as much pin recession as you want, as long as you don't have protrusion. You're also correct to note that the low-end cables are quite shocking in this regard. You'll find protrusion, you'll find recession so severe that the tip of the pin is barely visible, you'll find intermittent shorts from big solder blobs at the center-conductor/pin interface that aren't mechanically secured or otherwise prevented from contacting the outer shell, you'll find outer conductor mesh so scant that wifi packets will get into a terminated cable like it was an antenna, you'll find center pins that erupt into a full coat of green copper oxide even though the coupling nut still looks shiny and golden -- it's really the wild west out there in the world of cheap cables.

author: Brumby
author_rank: Unknown
timestamp: July 25, 2021, 05:53:27 am
content: So .... you maythinksuch cables would be like a well mannered horse until you hop on and find out (the hard way) that it's a wild bucking bronco.Never happened to me

author: Joel_Dunsmore
author_rank: Regular Contributor
timestamp: July 30, 2021, 02:13:53 am
content: Horse is a not my go to simile; "Cables are like dogs, either they are bad, they've been bad, or they're going to be bad; and if they're good, they only stay good with great care"

author: electrolust
author_rank: Unknown
timestamp: September 30, 2021, 09:11:46 pm
content: After making a bunch of these, I finally figured out I can gauge the cables before the final crimp (which sets the pin and dielectric depth). The crimp process does upset the depth but I found a pre-crimp range and technique that works and I can now reliably make test-quality cables.
Is this sound when turning on KA3005P normal? - Page 1
Forum section: electronics / testgear

author: JoeMEE
author_rank: Newbie
timestamp: October 01, 2021, 01:04:01 am
content: Hi, I just purchased a KA3005P. At times when turning on, I get a plop sound. I wanted to know if it was normal. I've attached an audio file of the sound below. Thanks for any help.https://voca.ro/17fKHwAODbAR
Purpose of D1 and D2  - Page 1
Forum section: electronics / testgear

author: abdulbadii
author_rank: Frequent Contributor
timestamp: September 30, 2021, 03:45:07 am
content: Would anyone please help out explain or show what is the purpose of D1 and D2 in circuit:

author: bob91343
author_rank: Super Contributor
timestamp: September 30, 2021, 04:52:28 am
content: They clip the wave to about 0.7V peak, or 1.5V p-p.

author: TurboTom
author_rank: Super Contributor
timestamp: September 30, 2021, 06:49:43 am
content: They are just for ESD protection and to safely discharge the DUT if someone attaches a charged cap to the tester. Voltage across the capacitor is unidirectional and very low (0.1V max). It's a very simple but still interesting instrument. In a practical setup, one of the voltage dividers (probably ideally R9/R10) should be adjustable to zero out the reading while no DUT is attached. The device will only work for (comparably) large capacitors (electrolytics) since it doesn't have a phase-sensitive rectifier and requires Zc to be much smaller than ESR to produce an accurate result.