hybridfree/eevblog-posts huggingface dataset:
Siglent SDS1104X-E + SDG1032X Bode plot BS - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: September 07, 2022, 03:20:47 pm
content: Both the scope and the SDG have been improved using "updated" license keys.Here is a BODE plot of a simple high-pass RC filter. Yes, I have tried other resistos and capacitors (of various types). The exact same issue occurs.Note the absolute whacko response below 150Hz, then it sorta settles down until 4KHz where it again just flips out.Anyone else have this wonderful experience?The scope FW is 6.1.37R8, the AWG is 1.01.01.33R1B6

author: nctnico
author_rank: Super Contributor
timestamp: September 07, 2022, 04:06:09 pm
content: Look at the signal level... there isn't enough amplitude to measure the phase. So your phase response will be allover the place. This will happen with any instrument that can show phase information.

author: BillyO
author_rank: Super Contributor
timestamp: September 07, 2022, 05:06:00 pm
content: Problem resolved.It turned out to be a slightly bent probe tip not allowing the hook to snap on properly.Took off the hook, straightened the tip, put the hook back on and ..Everything is fine. Thanks nctnico, your post started me on the road to figuring it out. I had been monitoring the filter output with another scope and the signal coming out should have been fine, and sure enough it was.
Tektronix 7A18 calibration help - Page 1
Forum section: electronics / testgear

author: Gianni
author_rank: Contributor
timestamp: September 05, 2022, 08:23:03 am
content: Hello,I own 3 7A18 plug-ins and I tried for the first time to calibrate one channel of on of them. I am a little confused, so I ask for some help.The calibration appears almost correct for both 1x (5mV) and 100x (0.5V) attenuator positionsIn x4 20mV and x10 (50mV) I have a "curl" (see photos) that I am not able to eliminateThe "flat top" control seems to have no effect, not only here, but also on the correctly working channel and everywhere I checked itI already tried to replace C114/C115 but without any changeI would be grate to whom could help me.

author: wn1fju
author_rank: Frequent Contributor
timestamp: September 05, 2022, 12:23:50 pm
content: Your unit isn't that bad. I've certainly seen worse with Tektronix 7000-series vertical plug-ins. They are without a doubt very difficult to calibrate properly.I assume you have switched the x4 and x10 attenuators across channels. This might tell you whether it is an attenuator problem or something else.In general, all these Tektronix cam mechanisms often benefit from a thorough cleaning. It's best to pull the entire attenuator board out, remove the attenuator blocks, and go at it with alcohol. Saturate a thin strip of paper and work it beneath the leaf contacts on the board while gently pressing down. Be very careful. Let the alcohol thoroughly dry for a few hours - nothing will work correctly if the board is still wet.
Need acquisition board for parts - TDS754D - Page 1
Forum section: electronics / testgear

author: calmissile
author_rank: Contributor
timestamp: September 05, 2022, 05:00:43 am
content: Not sure of all the board numbers that fit a low s/n TDS754D scope. Need it for parts to replace a couple bad IC's on an otherwise good board. My board is a 679-4166-01, but understand at least one other board is compatible.Any help is appreciated. Thankscalmissile@gmail.com
Video review of R&S WAM and WAL frequency meters (teardown & repair attempt) - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: September 04, 2022, 06:21:33 pm
content: In this episode, I review two frequency meters from the 1950s/1960s: the Rohde & Schwarz type WAM (BN 4312/2; 30-500 MHz) and type WAL (BN 4321/2; 470-2500MHz). With errors margins down to ± 0.08%, these were very high precision instruments in their days.Both instruments work on the resonance principle, but the resonation circuits are completely different, and especially the WAL has fascinating aspects to it with its tuneable λ/4 line (tuned cavity). Another interesting part is the use of now-forgotten Dezifix-B connectors.In the video, I do teardowns and a repair attempt and see whether any precision can still be achieved…https://youtu.be/EuDcRPdHJE0
TAKEDA RIDEN ADVANTEST TR6843 tear down and schematics - Page 1
Forum section: electronics / testgear

author: harrimansat
author_rank: Regular Contributor
timestamp: August 17, 2022, 09:52:18 am
content: TAKEDA RIDEN ADVANTEST TR6843 tear down and schematics

author: coromonadalix
author_rank: Super Contributor
timestamp: August 17, 2022, 10:59:24 am
content: do i see the 8640 ic with somekind of a blob and a windows on it ??be careful with ambient light ?? put a black tape on it ??

author: harrimansat
author_rank: Regular Contributor
timestamp: August 17, 2022, 04:23:23 pm
content: Is the oscillator, in some old equipmet I have seen some xtal in glass

author: serg-el
author_rank: Regular Contributor
timestamp: September 03, 2022, 10:13:56 pm
content: User's manual TR6843

author: serg-el
author_rank: Regular Contributor
timestamp: September 03, 2022, 10:17:06 pm
content: And his GPIB module

author: harrimansat
author_rank: Regular Contributor
timestamp: September 04, 2022, 08:12:20 am
content: Quote from: serg-el on September 03, 2022, 10:17:06 pmI need one of these!
Tek 2230 readout artefact - Page 1
Forum section: electronics / testgear

author: alan.bain
author_rank: Regular Contributor
timestamp: September 02, 2022, 08:36:04 am
content: Hi,My Tek 2230 (which arrived here not working and had a bit of work done on the PSUs, usual sort of age related capacitor stuff and typical pre-regulator/crowbar fault) has an interesting artefact when the digital display is on that a row of small dots appears at the top of the screen (circled in pink). Photo here in analog mode as that is usually the easiest to debug. Turning off the readout makes the dots at top vanish.I cannot really figure out what this is supposed to be; clearly Z-modulation is working (since the text at bottom isn't joined up and high speed sampling mode produces a field of dots) so if the beam weren't wanted I'd expect it to be cut off by the grid. Can anyone with a 2230 confirm that this isn't normal behaviour?They are great scopes, but not the easiest to work on due to the packed innards and a storage board which seems to get in the way wherever it might be... I never did find where they hid the astigmatism adjust pot!Alan

author: DavidKo
author_rank: Frequent Contributor
timestamp: September 02, 2022, 10:50:32 am
content: It points to the SRQ description above the display. It is not an error. For more details you probably need to read the manual (personally I will try GPIB section), but it can have more meanings.edit: Operator manual page 7-7https://download.tek.com/manual/2230_Operators.pdf

author: DavidKo
author_rank: Frequent Contributor
timestamp: September 02, 2022, 11:01:53 am
content: I recommend to go through the manual if you are not familiar with that device. It has a lot of features available by simply pulling the knobs out or in. Digitization mode have also a lot of adjustments. If you are using it at 230V check the power input filtering caps (they are hidden below the socket). Mine had blown up and it was nasty smell.

author: alan.bain
author_rank: Regular Contributor
timestamp: September 02, 2022, 12:40:17 pm
content: Thank you. That now makes much sense! I have been going through the operator's manual but didn't look in the GPIB section as I wasn't using that (yet!). I agree that the acquisition modes section is very complex and surprisingly powerful (given the age of the scope) and very useful.When you fix a scope you have used for years then it is clear that it is working, but when you fix one that was dead on arrival it can be harder to know what is "good behaviour" as I've had to deal with a whole series of display artefacts caused by hardware errors. When using one of these for the first time in analog mode with readout the slight gaps in the traces can be perplexing (you thing of ALT/CHOP) but it is a known behaviour which can be confirmed by turning off readout.The exploding RIFAs have been replaced (one exploded....)
Blocking DC into Active Probe - Page 1
Forum section: electronics / testgear

author: Scr1bbl3
author_rank: Contributor
timestamp: September 05, 2022, 03:32:20 am
content: Hello all,I just got my first active probe. I have a circuit I want to test it on that has a 9V DC component. The circuit under test is an LC oscillator so it's susceptible to capacitive loading - hence the active probe. The probe passes AC and DC (DC coupling). How do I block DC without adding capacitance to the circuit and pulling it off frequency? Thanks in advance.

author: jmw
author_rank: Frequent Contributor
timestamp: September 06, 2022, 03:53:46 pm
content: Preferably, you'd block DC at the probe output which is buffered from the DUT. If 9 V is out of the probe's DC range, you could add a series capacitor that is small enough not to detune the circuit but it may cost you some signal attenuation.

author: TimFox
author_rank: Super Contributor
timestamp: September 06, 2022, 04:07:31 pm
content: Adding a small capacitor ahead of the probe should not affect directly the shunt capacitance connected to the circuit (which would detune your resonant circuit).As an example, if your active probe input capacitance is 5 pF (maybe in parallel with 1 megohm), then a 50 pF series capacitance would have an attenuation of approximately 0.9 V/V at high frequencies, and give a high-pass filter that is -3 dB down at 35 kHz (with the assumed 1 megohm input resistance).
Agilent/Keysight AutoProbe 1 Replacement Pins - Page 1
Forum section: electronics / testgear

author: Weston
author_rank: Regular Contributor
timestamp: October 20, 2021, 06:46:10 am
content: I am helping out with a student power electronics lab and I have found that a large number of the current probes using the Agilent/Keysight AutoProbe 1 interface due not work due to damaged pins. I was hoping to replace the damaged pins and restore the probe functionality.Has anyone ever identified the type of pogo pin that the Autprobe 1 interface uses and found a replacement? This is the interface used for most Agilent active probes:https://prc.keysight.com/Content/ProbeInterfaces.htmlI searched for old forum posts and was surprised when I did not find any info on this. The pins are easily damaged, so it seems like it should be a pretty common problem.

author: HighVoltage
author_rank: Super Contributor
timestamp: October 20, 2021, 08:12:44 am
content: Those are most likely Keysight proprietary pins.I would contact Keysight and ask, if these pins are available for sale.

author: rvalente
author_rank: Frequent Contributor
timestamp: October 21, 2021, 11:03:12 am
content: Did you check pogo pins?

author: Gribo
author_rank: Frequent Contributor
timestamp: October 21, 2021, 04:29:06 pm
content: Shariar did a teardown of one of these probes. These were standard 100mil pogo pins.

author: Weston
author_rank: Regular Contributor
timestamp: August 31, 2022, 06:43:05 pm
content: As a very late update, I have tracked down an exact replacement pogo pin and have confirmed it works!https://www.mouser.com/ProductDetail/Smiths-Interconnect-IDI/S-2-J-4-G?qs=Uzd%2Fwh%252BZzhCupKIOd%2F7fvQ%3D%3DAlso, if the pogo pin gets pushed in all the way it can be impossible to remove with pliers. I have discovered you can effectively bond a small wire (30AWG wire bond wire works best) to the tip of the pogo pin and pull it out by capacitively spot welding a wire to the tip with a ~60V lab power supply. If you take apart the probe connector you can remove the whole pogo pin assembly and make a connection to the back side with an alligator clip.

author: Gribo
author_rank: Frequent Contributor
timestamp: August 31, 2022, 07:35:45 pm
content: Depending on how they get stuck, you might want to use shorter or longer pins, with higher or lower force. There are other manufacturers out there beside IDI - Mill-max, QM Tech, Ingun and few others.

author: HighVoltage
author_rank: Super Contributor
timestamp: September 01, 2022, 06:34:21 am
content: Nice to know, that you got it to work.
Rigol Ultra Station doesn't run under Windows 11? - Page 1
Forum section: electronics / testgear

author: blubillcanada
author_rank: Contributor
timestamp: August 31, 2022, 05:44:31 pm
content: I can figure out why Rigol's Ultra Station (ARB waveform editor) does not load. It briefly runs after this popup appears (you can't interact with it), but it's unusable and shuts down after a few seconds. Seems I'm missing Instr.libAny ideas?
Megger MIT420 (400 Series) Insulation Resistance Meter - Page 1
Forum section: electronics / testgear

author: ibd1977
author_rank: Newbie
timestamp: August 31, 2022, 12:22:50 am
content: HelloI currently have an Megger MIT420 displaying an E45 Error Code. Does anyone know what the code means and have any schematics for troubleshooting and repair?The unit appears to have an internal short when using insulation resistance mode. Upon opening & inspecting, there is definitely a burnt electronics smell present and what looks like a metal oxide varistor has burnt out. See attached photos.I would like to attempt a repair but I cannot identify the part that has failed.Any feedback would be appreciated.Thank you.

author: geggi1
author_rank: Frequent Contributor
timestamp: August 31, 2022, 05:33:43 am
content: From what I can see at your first picture my suggestion is that you try to remove the varistor on the input and see if the error code is gone.You could also try to contact Megger directly about what the error code is representing.I live in Norway and the Norwegian Megger.no is very helpfull if you contact them.

author: ibd1977
author_rank: Newbie
timestamp: August 31, 2022, 06:43:34 am
content: Yeah tried Megger but they are only interested in selling us a new meter and not parts to repair. Typical anti-repair business model.So yes to your question, I have removed both MOV's as they both appeared damaged and it cleared the issue. The meter appears to be working properly but now without any circuit protection.These are the components I have identified from this meter and other meters we have in our facility.Insulation Resistance SideMfr. No: V1000LA160BPMfr.: LittelfuseP/N P1000L16Multimeter SideMfr. No: B72220S0110K101Mfr.: EPCOS / TDKP/N S20K11Any suggestions where I can buy 1 of each which could be posted in the mail or locally sourced in Adelaide, Australia?

author: Ice-Tea
author_rank: Super Contributor
timestamp: August 31, 2022, 07:38:53 am
content: Both Digikey and Mouser have stock and ship to Australia...

author: lowimpedance
author_rank: Super Contributor
timestamp: August 31, 2022, 10:26:17 am
content: Also look closer at the resistor below the MOV, it looks to have been stressed too although hard to tell from the pic.

author: ibd1977
author_rank: Newbie
timestamp: August 31, 2022, 11:10:16 am
content: Measuring ~4.9 Kohms but the colour bands have discoloured so I can't tell what value its meant to be.
enclosure like used by rigol dp832 - Page 1
Forum section: electronics / testgear

author: Redeeman
author_rank: Contributor
timestamp: August 29, 2022, 11:25:13 pm
content: Does anyone know where its possible to buy some enclosures similar to what rigol uses in the DP832, and now UNI-T in UDP1306C or UDP3000S.

author: luma
author_rank: Regular Contributor
timestamp: August 30, 2022, 04:42:15 pm
content: Presumably Rigol et al contract their enclosures to order but you can find similar enclosures on alibaba etc. Search for "instrument enclosure" or "desktop enclosure",here's an example.
Interfacing a Rigol LH1116 Active Logic Head onto a Cypress FX3 16ch 100MHz LA?  - Page 1
Forum section: electronics / testgear

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: August 30, 2022, 10:05:03 pm
content: I am in need of a PC based 100MHz logic analyzer for a project. I don't have $$$ for a commercial unit.The Cypress EZ-USB FX3 Explorer kit can be used as a 100MHz logic analyzer with Sigrok PulseView.https://community.infineon.com/t5/Knowledge-Base-Articles/EZ-USB-FX3-Explorer-kit-as-16-channel-100-MHz-logic-analyzer-with-sigrok/ta-p/283993https://www.infineon.com/cms/en/product/evaluation-boards/cyusb3kit-003/?utm_source=cypress&utm_medium=referral&utm_campaign=202110_globe_en_all_integration-dev_kitThe FX3 could also be used to generate signals or interface directly to a variety of devices - I2C, SPI, etc. It is a programmable device and could do many things if one took the time to program it. Cypress provides many examples such as memory device programming, etc.The I/O on the FX3 is unbuffered and unprotected. It will operate at a variety of input voltages from 1.2 to 3.3V.I have an unused Rigol LH1116 Logic Head.Does the LH1116 have built in buffering ?Does it have over voltage protection ?What is its input voltage range ? My LH1116 says "Max +/-40V". It also says Input Z: 100Kohm. Does the head convert +/-40V to logic level (3.3V ?)What would it take to interface the LH1116 to the FX3 ? Does someone have a pinout for it ? What connector does the LH1116 ribbon cable mate to ?Thanks

author: thm_w
author_rank: Super Contributor
timestamp: August 30, 2022, 10:11:45 pm
content: What is the budget.What is the bandwidth requirement for how many signals.DSLogic Plus can be had for $100 with sample rates up to 400MHz (4 channel buffered)https://www.dreamsourcelab.com/shop/logic-analyzer/dslogic-plus/

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: August 30, 2022, 10:23:07 pm
content: Thanks for the link.The DSLogic looks like a great product. I'm going to use the FX3 because I need to generate some signals in order to test the DUT.

author: thm_w
author_rank: Super Contributor
timestamp: August 30, 2022, 11:12:03 pm
content: Are you expecting to generate and monitor signals simultaneously using the FX3? Does sigrok support that?Maybe start with generating and buffering signals first.Quote40V max, if its active maybe its buffering it, you'd have to open it up.With the dslogic its just a passive probe:https://sigrok.org/wiki/DreamSourceLab_DSLogic_PlusYou can read some of the threads here around logic analyzer board design if you really want to get into the details.

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: August 31, 2022, 12:18:41 am
content: QuoteWhatever that means.

author: thm_w
author_rank: Super Contributor
timestamp: August 31, 2022, 12:34:51 am
content: The passive filter is in the probe wires. So if you leave those off, the voltage range is lower, as it goes directly into a I/O port.You would always use the included probe wires.
Aneng AN8203 - Kaput? - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: August 30, 2022, 02:16:29 pm
content: Yesterday I was measuring a 12V supply to see if it was actually 12 V with my AN8203 when the display went blank. Now when I turn it on it first shows all the graphics on teh display, beeps 5 times, then clear the display except for the "AUTO" element and then does nothing further.Changing the batteries was not any help.Anyone else have this experience? Is it landfill?

author: Fungus
author_rank: Super Contributor
timestamp: August 30, 2022, 04:19:21 pm
content: Quote from: BillyO on August 30, 2022, 02:16:29 pmYes.

author: BillyO
author_rank: Super Contributor
timestamp: August 30, 2022, 09:18:09 pm
content: It lives!Seeing as how I had come to grips with throwing this out I decided to pull a DJ and "take it apart!"It turned out to be a broken solder joint on the negative batter spring. A little clean-up, a little flux and a dap of solder and it's back to it's barely useful self.Actually it sees more use than some of my other meters specifically because it will fit in my pocket.

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2022, 09:47:06 pm
content: Quote from: BillyO on August 30, 2022, 09:18:09 pmYou need get bigger pockets to accommodate a real DMM.
SIGROK - recognizs clone 8bit Saelea logic analyzer but... - Page 1
Forum section: electronics / testgear

author: IconicPCB
author_rank: Super Contributor
timestamp: August 31, 2022, 07:36:09 am
content: OK.. Trying to get Sigrok to run and support the clone hardware.It is loaded and runs ...sort of.Trying to select the Saelea hardware does not work. in the drop down menu it shows the demo and happily runs through the show.Jus below the demo option is the entry for Saeleae clone. Selecting Saeleae results in a general error.I am running linux ubuntu 22,04I promise to wear rubber gloves if you promise to hold my hand with the view to resolving this problem ( it has to be something simple... and stupid... my specialty )

author: pgo
author_rank: Regular Contributor
timestamp: August 31, 2022, 02:47:32 pm
content: This is what I see with Pulseview and a clone that has the same id as Saleae if that is any use

author: IconicPCB
author_rank: Super Contributor
timestamp: September 01, 2022, 02:40:40 am
content: Thanks for your posting.At this point ( displayed in your image ) when i select the same driver and press the scan button .... nothing comes up.I have swapped out the USB cable and still no equipment selected/enabled.I will try jockeying the USB port to see if that may be at fault.

author: pgo
author_rank: Regular Contributor
timestamp: September 01, 2022, 06:31:26 am
content: Have you installed the USB driver?Not the Saleae one!See this pagehttps://sigrok.org/wiki/Windows#DriversCheck what driver appears in Hardware manager.Under Linux I don;t believe a driver is required.Macs I have no idea.
Riden RD6018 - Thoughts on AC/DC Power Supply for It - Page 1
Forum section: electronics / testgear

author: ajacocks
author_rank: Newbie
timestamp: August 22, 2022, 01:37:54 pm
content: This may be obvious to others here, but why could you not power the RD6018 with a quality 12V >1000 watt SMPS, and run it through a boost converter, to get the 60-70 volts that this buck converter wants as input?I’m looking for good options for the back end of this buck converter, and there aren’t many, other than the manufacture-specified non-name 60-70VDC power supply.Any other suggestions welcome, and if it makes any difference, I’m in 120 VAC land.Thanks!- Alex

author: ajacocks
author_rank: Newbie
timestamp: August 29, 2022, 07:34:43 pm
content: Nobody, huh?Well, to get started, I purchased a Mean Well LRS-350-48, as that is at least a quality supply, and should serve most of my needs.- Alex

author: MarkF
author_rank: Super Contributor
timestamp: August 29, 2022, 07:40:20 pm
content: Funny, I was just going to suggest a MEAN WELL.I bought the 15V Mean Well LRS-150F-15 for my model railroad.
TEA Moderation Poll - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: August 28, 2022, 11:50:37 am
content: As the poll says.Please DO NOT discuss it here, there is a thread for that:https://www.eevblog.com/forum/chat/discussing-the-usage-of-the-tea-thread/

author: gnif
author_rank: Unknown
timestamp: August 29, 2022, 01:10:50 am
content: I would like to point out something here as some are not voting (as stated on the new TEA forum) with the rationale that the moderators can see who voted.1) Obviously the database needs to record who voted to prevent double votes and to allow you to retract your vote.2) SMF does not provide a way for the moderators to see who voted, period. In fact, even the SMF admin can not even access this information.3) While I as the server admin (not SMF admin) could go into the database and figure out how to pull this data, I couldn't be less interested in doing so, I have better things to spend my time on.4) Dave can request this information which is within his rights as the server owner, however in the 8 years I have been here, to date, Dave has never made such a request.

author: EEVblog
author_rank: Unknown
timestamp: August 29, 2022, 01:31:44 am
content: Quote from: gnif on August 29, 2022, 01:10:50 amCorrect, I cannot see who voted. There is no mechanism inside SMF for me to see this, and I have never made a request to attempt to do this, ever.And obviously I'm too dumb with computers to go into the SQL database and search for and figure out how the data is mapped and try to decode it etc. Probably needs a siginifcant amount of work with scripts or something.In short, your poll data is very anonymous.
BDI200 Firmware for PPC 6xx/7xx/74xx with GDB - Page 1
Forum section: electronics / testgear

author: sjhill
author_rank: Newbie
timestamp: August 27, 2022, 08:57:14 pm
content: I already searched through the forums for previous BDI2000 firmware posts. I am looking for PPC 6xx7xx/74xx firmware that supports GDB or EDGE debugger. The filenames are of the form:b20copgd.1xxb20copfw.1xxIf anyone has firmware files they are willing to share, please please let me know. Thanks.
Tektronix  063-3967-02 CD-Rom - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: August 27, 2022, 05:20:37 pm
content: Found this in my old stuff, was never openedWould it help someone here ??See the attached pictureWill do an Iso out of it, not sure where i'll host it ??

author: ataradov
author_rank: Super Contributor
timestamp: August 27, 2022, 05:47:17 pm
content: Don't know about being useful, but the best place for hosting archival stuff is archive.org.

author: coromonadalix
author_rank: Super Contributor
timestamp: August 27, 2022, 06:29:38 pm
content: will be done ..Seach for : Tektronix 063-3967-02I think it came with the TDS220 scopes ??EDIT: Done .... TEKSOFTWARE should give a result too ??
Spectrum analyser HP3582A - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: August 26, 2022, 09:05:16 am
content: I design, build, modify and repair valve amplifiers and some other audio stuff plus also do some digital work. I’ve not had a spectrum analyser before but I’ve wanted one for audio work for a long time. Unfortunately spectrum analysers that go low enough for audio work are rare and I can’t find a modern one at a realistic price.Most people seem to go for older HP ones and I found a HP3582A at a nice price at a police auction so I’ve bought it. The machine is untested other than lighting up but there is a 30 day refund policy on faulty items so I’m ok with that.The journey is 120 miles each way but they said I can plug it in and test it when I get there so I would like to test it to avoid another 240 mile round trip to return it if it isn’t working.So my question. How am I best testing it? It doesn’t come with any probes, what should I take with me? I understand what it can do but I will be learning how to use it once I get it so some tips on testing would be appreciated. What leads or other things should I take with me? Sig gen? BNC leads? I only have scope probes.What are the input limits on spectrum analysers? I can probably download the manual to find that question.Thanks

author: cowasaki
author_rank: Frequent Contributor
timestamp: August 26, 2022, 09:10:18 am
content: I’ve got the manual and this quick reference document.https://web.mst.edu/cottrell/ME240/Resources/Inst_manuals/HP_3582A_Spectrum_Analyzer_quick_reference_guide.pdf

author: joeqsmith
author_rank: Super Contributor
timestamp: August 26, 2022, 12:03:18 pm
content: I used that analyzer back in the early-mid 80s. At one time I was wanting to get a waterfall curve and used that trigger input with a delay circuit that would step through the wave I was trying to sample. I would repeat the wave over and over to collect the data. Nightmare but hey, we had the IBM PC at the time and I don't think the SoundBlaster was even around yet.I would just take along a function generator along and some cables and just try it.
LMR-195 Coaxial Cable for bringing out rear-panel instrument connections - Page 1
Forum section: electronics / testgear

author: matthuszagh
author_rank: Frequent Contributor
timestamp: August 26, 2022, 04:30:09 am
content: I've accumulated a reasonably large number of instruments housed in 19" racks. A lot of this is microwave gear with useful rear-panel connectors. In my current setup, it's a pain to get to these rear connectors, so I'm planning to bring these connections out to the front of the rack with custom BNC cable assemblies. The reason to custom make these is partly for cost, but also I'd like to get in the habit of assembling my own coaxial cables.I'm currently leaning toward primarily using LMR-195 for this application. What do people think?Here's my thought process. I've seen a lot of endorsements of RG-400 cable and I'm very intrigued by it, but at least at Pasternack, the RG-400 is 10x the price of LMR-195. It seems like the main downsides of LMR-195 vs RG-400 are(1) foam PE can't handle as high voltage(2) foam PE can melt at soldering temperatures(3) the foil shield can be damaged by repeated flexure (seehttps://www.eevblog.com/forum/rf-microwave/cable-brand-and-type-for-lab-bnc-cables-50-ohm/msg3597975/#msg3597975andhttps://www.eevblog.com/forum/beginners/coaxial-cable-rg142-rg400-lmr400-confusion/msg2547201/#msg2547201)(4) dielectric contamination (seehttps://www.eevblog.com/forum/beginners/coaxial-cable-rg142-rg400-lmr400-confusion/msg2547201/#msg2547201)Am I missing any? Reason (1) doesn't matter since I won't be dealing with high enough voltages where this matters. For (2), I plan to assemble these using crimp for both the ferrule and center contact with a Daniels HX4 and Y205P die. For (3), these cables will be left in position and flexed very little, so I don't see this being a major issue. For (4), I'm not really sure what this means. Is this humidity ingress? Something else? What's the symptom? Reflections? Loss?On the other hand '195 is lower loss and more flexible (though that shouldn't really matter here). I expect LMR-195 is somewhat overkill for a number of these connections (and indeed for some I may use RG-58 or whatever's cheapest), but at $1/ft from a reputable manufacturer it's cheap enough that it doesn't make a big difference for the total cost of these assemblies, and I'm happy to have the peace of mind of good performance.I'm still interested by RG400 and will probably use it for high-quality patch cables that undergo frequent flexing. I do understand it's not very flexible, and for applications that don't need the shielding performance I may go with RG-316 instead.I should also mention that one of the benefits of LMR-195 and RG-400 is a degree of mechanical compatibility with RG-58, which means it's easy to find crimping tools and connectors for them.
Tektronix P5205 vs MICSIG DP20003 - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: August 26, 2022, 03:42:42 am
content: I put my active probes with 10 Vpp sinusoidal signal with sweep rate of 500 ms from 1 MHz to 100 MHz with siglent sdg 2042X, you can observe linearity on channel 1 from Tektronix probe and you can see how micsig can't give 100 MHz specified in its datasheet. I did that because my Fluke 199c is 200 MHz oscilloscope starts to attenuating from since 60 MHz, I wanted to know how good the response of the probes was as a function of frequency, it is clear that it is not a bode plot, but it gives me an idea of how reliable it could be to take measurements with the micsig probe in that frequency range.Regards
Good tester/component tester for repair shop - Page 1
Forum section: electronics / testgear

author: reyntjensm
author_rank: Regular Contributor
timestamp: August 25, 2022, 02:34:38 am
content: I have been working at a repair shop for a while know. We specialize in industrial equipment so we receive a PCB from an industrial machine without any schematics or information about the issue. We try to check all the components on the PCB with different testers like VI-plot on a scope or with the Peak Electronics testers like the DCA75, SCR100 and ESR70 for the caps.At this point i want to start my own business, i already have a scope with VI-plot capabilities but i don't have the Peak testers. I would like to buy all the same testers as my boss had but this would cost me 500eu+. The results from the Peak testers are good but i don't like the workflow with having 4 different testers in the same case etc. I would prefer one tester for all the test's i would like to do. Any suggestions?

author: tautech
author_rank: Super Contributor
timestamp: August 25, 2022, 05:30:30 am
content: Quote from: reyntjensm on August 25, 2022, 02:34:38 amA set of quality Smart Tweezers, LCR and ESR measurements all in one hand.Shannon's from HK would be a good choice although he has some current issues with tips being too fine and not standing up to 'in circuit' work.See here:https://www.eevblog.com/forum/testgear/design-a-new-precision-lcr-tweezers/

author: reyntjensm
author_rank: Regular Contributor
timestamp: August 26, 2022, 12:58:40 am
content: Quote from: tautech on August 25, 2022, 05:30:30 amThanks! I already forgot about those tweezers but it's indeed a good alternative for the ESR and LCR measurement. I will do some more research on this topic.But still it's not suitable for component testing like mosfets/transistors.

author: tautech
author_rank: Super Contributor
timestamp: August 26, 2022, 01:02:26 am
content: Quote from: reyntjensm on August 26, 2022, 12:58:40 amTo a point you are correct however just using Diode test will often find a failed transistor after which any cheap Hfe tester will prove if a part meets specs or not.
[SOLVED] NI MAX does not see my Siglent SPD3303 - Page 1
Forum section: electronics / testgear

author: mushroom
author_rank: Regular Contributor
timestamp: August 25, 2022, 05:44:54 pm
content: Hi,I'm unable to connect to the PSU using NI MAX. Other Siglent devices (DMM, scope, AWG) are showing... Not the PSU. Entering its IP by hand has no effect.I can control the PSU using EasyPower. I can ping it.But no luck with NI MAX.DHCP + static lease so the IP is always the same.unlocked SPD3303X-E (=SPD3303X)hardware : v3.0firmware : SPD3303X V1.01.01.02.07R2What am I doing wrong ?

author: tautech
author_rank: Super Contributor
timestamp: August 25, 2022, 08:36:05 pm
content: If rolled back to the X-E version does the problem still remain ?

author: mushroom
author_rank: Regular Contributor
timestamp: August 25, 2022, 10:03:07 pm
content: I reverted the PSU to X-E, re-upgraded to 1.01.01.0.2.07R2 (X-E firmware version) : it does not make any difference. Tested from two computers.I also tried with another IP I defined on the device rather than assigned by the DHCP. Still no PSU on the NI utility even when trying to define it manually : "Could not open a VISA session to 'TCPIP0:nnnnnn blah blah'"The DHCP (a PiHole) works properly. When validating the DHCP option on the PSU, I can see the IP changing for the static lease I defined in the DHCP.I can telnet using port 4025 (seen here :https://www.eevblog.com/forum/testgear/spd3303x-e-scpi-interface-issues/), I get a beep when connecting, but have no echo so I don't see what I type. problem solved !I wasn't properly entering the parameters. In the dialog box, do not enter information in the "LAN Device Name". I was entering the Hostname in this field !So, entering the IP or the hostname in the first field, and letting the second one alone is the right thing to do. RTFDI ! Read The F* Dialog Instructions !https://www.siglenteu.com/application-note/verification-of-a-working-remote-communications-connection-using-ni-max/
Rigol DSA 832E-TG Unlimited Trial Mod - Page 1
Forum section: electronics / testgear

author: nuclearspud
author_rank: Newbie
timestamp: October 02, 2020, 01:14:56 pm
content: Hi All,I couldn't find any unlimited trial time hacks for the DSA 832E TG,I assumed it was similar to the DSA 815, the board is a different layout, so I did some quick snooping around and found the following,U166 is an MB85RC16 FRAMapplied a quick solder short on pint 7 & 8 as shown.8=VDD7=WP - "H" is protected.Did a few reboots and the countdown timer is not being updated as per DSA815 mod.

author: Donny
author_rank: Newbie
timestamp: November 14, 2021, 10:07:30 am
content: Good day + thank you. As noone replied to this and I am also owning a DSA832E-TG I just wanted to confirm this: Works like a treat!Funny thing: I only did find this postafteropening my device and including "U166" in some searchesResults for this are very scarce anyway.

author: geggi1
author_rank: Frequent Contributor
timestamp: August 30, 2022, 10:47:03 pm
content: I know this is kind of an old post!Was just thinking what does the U166 contain of data?Woud it be possible to just replace the chip and then have countdown timer reset?Or even better is it possible to replace the U166 with a diffrent kind of circuit maybe some kind of memory and a tiny MCU that would reset the counter when the trials are expired?
SDS1104X-E - Custom protocol decoder - Page 1
Forum section: electronics / testgear

author: nejcraft
author_rank: Newbie
timestamp: August 24, 2022, 03:50:10 pm
content: HelloI was wondering if there is any way to add new program decoding capabilities?I'd like to add the NMRA DCC protocol. I could see it done in 2 ways:- hacking the firmware and add completely new option - I presume COOL but HARD- creating just a pc program that reads the data off of osciloscope and does the magic on its own - Easier but still not super easyI know there were some attempts to fully hack and RE the firmware, but wasn't able to find any 100% successfull, the cramfs doesn't seem to contain the app, so there's not point to tap in for me.Similarly there are multiple different scope viewers which could be misused for the custom protocol decoding on PC, but Iam not sure. Maybe someone tried similar stuff thru some Open Source app?Cheers

author: DavidAlfa
author_rank: Super Contributor
timestamp: August 25, 2022, 07:26:49 am
content: Why start with the most complex route? Just get a cheap 24MHz logic analyzer on ebay/Aliexpress.Sigrok doesn't seem to have DCC decoder, but Saelae Logicdoes.Also there's aDecoder for arduino.Remember the inputs can't take more than 5V, DCC uses 12-22V so you'll need some circuitry to protect them.A 22K series resistor with a 3.3...4.7V zener should to the job, you can also use a simple voltage divider.

author: nejcraft
author_rank: Newbie
timestamp: August 25, 2022, 07:30:06 am
content: Yeah,The 5V and the fact that I'd have to have PC clouse enough made me question if I could use the scope somehow, even if just as a remove voltage sampler.I have those cheap chinese Salae knockoffs, but they are not pleasant to use unlike the scope, which is pretty handy.

author: Hydron
author_rank: Super Contributor
timestamp: August 25, 2022, 08:16:04 am
content: Maybe check out if sigrok can do the job for you? Can always add instruments if needed as it's open source.
Retrieve config Via USB for Rigol devices - Page 1
Forum section: electronics / testgear

author: Ross
author_rank: Contributor
timestamp: August 23, 2022, 10:46:10 pm
content: Hi,I know that the configuration of a Rigol PSU or Sig gen can be saved to a USB disk or to the instruments internal memory. Is there a way of retrieving it via the USB slave port (i.e on a PC)?Thanks,Ross

author: thm_w
author_rank: Super Contributor
timestamp: August 23, 2022, 11:20:18 pm
content: Depends on the device. You'll have to read the associated SCPI programming guide to find out.In some cases there are SCPI commands to read back the entire configuration, in other cases there might not be, and you'd have to read back each setting one at a time.https://www.batronix.com/pdf/Rigol/DP800_ProgrammingGuide_EN.pdf

author: Ross
author_rank: Contributor
timestamp: August 24, 2022, 01:42:28 am
content: Quote from: thm_w on August 23, 2022, 11:20:18 pmThanks for your quick reply, I have a DP800 series PSU and have looked through the programming manual before and have not found a command for full configuration output. Can you point me to the SCPI command?

author: thm_w
author_rank: Super Contributor
timestamp: August 24, 2022, 09:51:46 pm
content: Quote from: Ross on August 24, 2022, 01:42:28 amIf you didn't see it, it doesn't exist on the DP800.
How to upgrade a DS2072A with Linux using USB.  - Page 1
Forum section: electronics / testgear

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: August 23, 2022, 10:02:51 pm
content: Here is how I upgraded my DS2072A in Linux over USB instead of LAN. For some reason I couldn't make my LAN connection work.Step 1) Connect the back USB port of your scope to your Linux workstation with a USB cable.Apparently the workstation needs to have a USB2 host controller, not a USB3. EHCI, not XHCI.See here:https://www.teuniz.net/DSRemote/Step 2) Test that the connection works.$echo "*IDN?" > /dev/usbtmc0; cat /dev/usbtmc0RIGOL TECHNOLOGIES,DS2072A,DS2DXXXXX,00.03.03.SP1cat: /dev/usbtmc0: Connection timed outThe timed out message is OK. All it means is that cat ran out of data to print out.Note: You'll need to give yourself permission to open the USB port as it is owned by root when the scope is plugged in.#chown me /dev/usbtmc0Step 3) Obtain the binary file from the scope.$echo ":SYST:UTIL:READ? 1,33554432" > /dev/usbtmc0; cat /dev/usbtmc0 > ds2072a.bin$ ls -al *.bin-rw-r--r--. 1 me me 33554444 Aug 23 13:25 ds2072a.binStep 4) Download the appropriate version of rigup fromhttps://gotroot.ca/rigol/.Unzip it. Run it. Version 0.4.2 didn't work for me. Said there were no keys found. 0.4 worked.$ ./riguprigup - Version 0.4Usage: rigup MODEL DUMPFILECreates a set of licenses suitable for the given model.Needs a memory dump of the DRAM from the specificdevice to create the licenses.MODEL One of DS2072A, DS2102A or DS2202ADUMPFILE Binary file containing a memory dumpExample:rigup ds2072a memory_dump.binAvailable expert commands are: (omit parameters for help)rigup scan  MEMORYDUMPrigup serial KEYFILE SERIALNUMBERrigup license KEYFILE OPTIONSrigup info KEYFILE LICENSErigup search  MEMORYDUMPrigup break PUBLICKEYrigup riglol ...Step 5) Extract the Keys$ ./rigup ds2072a ds2072a.binrigup ds2072a - Version 0.4Serial number: XXXXXNSEH: LGUJTEM-EHNSZZT-ZPF4RUS-TJ9BUSM All options, no bandwidth upgradeNSER: 4YJDMNS-R9HCABJ-UGYCKC8-H2E3JSM All options, bandwidth 100 MHzNSEQ: J5RNDTR-E9XQHN2-3JWWN47-KH62USM All options, bandwidth 200 MHzNS8H: B4GP424-J25BV2T-WMHMS9G-GBGQCVM All options, bandwidth 300 MHzStep 6) Place the license file on a USB drive.Create a file <My DS2072A Serial number>.lic with a text editor. NOT A WORD PROCESSOR.Put one of the keys on the first line in the file. Example: "B4GP424-J25BV2T-WMHMS9G-GBGQCVM" without the quotes. Save the file.Put the file on the root directory of a FAT 32 USB drive. Mine was 8 GB.Step 7) Boot the scope. Insert the USB drive in the scope. A popup message should appear asking if you want to upgrade the license on your scope.* The right menu will have an item License in it. Select it and proceed with the upgrade.* This only happens with firmware 00.03.03.02.06 or later. If your firmware is newer than this, upgrade it.https://www.rigolna.com/firmware/Your scope will update the license after the firmware is upgraded.Enjoy.
Enabling options at a Tek 5104 scope (non B, WindowsME version) - Page 1
Forum section: electronics / testgear

author: chronos42
author_rank: Regular Contributor
timestamp: August 16, 2022, 05:47:24 am
content: Hi,I got a Tektronix TDS5104 scope from a flea market and brought it back to live.That was easy, actually I only had to replace the CMOS battery on the mainboard an reconfigure the mainboard bios.It is not the B version, but an early version with windows ME.Unfortunately it lacks all options, I want al least the advanced math option.Is there any information how to create the installation code or some other method?To pay 8000$ for each option for a 20 year old oscilloscope is not an option...I could get a brandnew highend scope for this money today.I searched the web and the eevblog forum, but I could not find any really helpfull information about this topic.

author: chronos42
author_rank: Regular Contributor
timestamp: August 24, 2022, 03:07:16 pm
content: really no one here has any information on this topic?

author: alpher
author_rank: Frequent Contributor
timestamp: August 24, 2022, 03:48:27 pm
content: Did you look at few of TDS7000 series threads here?, these may be of help.

author: chronos42
author_rank: Regular Contributor
timestamp: August 25, 2022, 08:47:23 am
content: Hi,I only found this:https://0xacab.org/mitic/tek-ssc/-/blob/master/README.mdI will give a try, maybe it is working. Beside of this, I found nothing about this topic, what is really helpful.
Current clamp seeing oscillations? - Page 1
Forum section: electronics / testgear

author: Kronkulus
author_rank: Contributor
timestamp: September 01, 2022, 06:57:17 pm
content: At work I was testing a constant current sink circuit. It uses a zener and a resistor in combo with a p-fet to set the sink current. It is designed to work up to some high DC voltages, around 150VDC.I had a current clamp on the supply input, and a differential probe across the current set resistor at the same time. The current clamp sees some really high amplitude 125kHz oscillations, while the differential probe sees a steady voltage across the current set resistor. The Vgs of the fet is steady as well. There's a logic feedback signal as well thats only active when the current is flowing through the current sink. This all points to this just being the current clamp going nuts.Any ideas as to what could be causing this oscillation on the output of the current clamp?

author: slugrustle
author_rank: Frequent Contributor
timestamp: September 02, 2022, 03:40:54 pm
content: Assuming p-fet means P-Channel MOSFET not P-Channel JFET. I've seen oscillations in a related circuit before. Zener noise could be coupling onto the MOSFET gate. Can you post a diagram of both the circuit with part numbers and the test setup?In my case, putting a 100Ω resistor between the Zener and the MOSFET gate helped remove the oscillations I was seeing.If you can glean the transconductance of your MOSFET at the circuit's operating point from the datasheet or from a SPICE model, you can work backwards from the channel current oscillation amplitude to a ballpark Vgs oscillation amplitude. It might be small. I should also note that, unless you're using an Exicon EXC10P20, I am not aware of any modern P-Channel MOSFETs that are designed for linear applications like this. You will be risking thermal instability. Older, higher voltage planar parts with wide SOA ratings have the best chance of being ok, but they're still not designed to operate in this mode. IXYS makes power N-Channel MOSFETs designed for linear applications; those are worth a look. You might also want to consider a depletion mode N-Channel MOSFET, as those are designed specifically for this kind of application. A circuit based on BJTs would also be ok from a thermal stability standpoint provided you avoid second breakdown.
R&S FSEM30... any service manual or Block diagrams? - Page 1
Forum section: electronics / testgear

author: Tracker
author_rank: Regular Contributor
timestamp: August 23, 2022, 03:22:31 pm
content: Howdy folks,I have acquired a lovely R&S FSEM30 which was working well up until it just decided to fail a self test (fail fast measurement RAM).Does anyone know where I might get a service manual?Perhaps there is some other model which is very close?Thanks !!!

author: switchabl
author_rank: Frequent Contributor
timestamp: August 23, 2022, 03:40:23 pm
content: I think the FSEA (3.5 GHz) and FSEB (7 GHz) will be very similar except for the RF section, so this may help:http://eww.ko4bb.com/getsimple/index.php?id=manuals&dir=Rohde_Schwarz/Rohde_Schwarz_FSE

author: Tracker
author_rank: Regular Contributor
timestamp: August 23, 2022, 05:19:58 pm
content: Dear switchabl, you are correct... I have downloaded and started fault-finding....I may open a new repair thread on this one, it's a digital problem and I'm more comfortable with RF.Thanks again sir!