hybridfree/eevblog-posts huggingface dataset:
Update Agilent DSO6000 series to Firmware version 6.20 or better stay with 6.16? - Page 1
Forum section: electronics / testgear

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 17, 2020, 10:23:51 am
content: IIRC there was a problem with version 6.20 regarding horizontal mode "zoom" (unstable jumping around / jitter, can't remember exactly).Unfortunately forum search could not find the topic...

author: HighVoltage
author_rank: Super Contributor
timestamp: November 19, 2020, 04:15:48 pm
content: Quote from: Greybeard on November 17, 2020, 10:23:51 amI have two of these scopes and both have been upgraded to FW v6.20 and I have no problems at all.I have also not heard of this zoom problem.

author: nctnico
author_rank: Super Contributor
timestamp: November 19, 2020, 05:07:25 pm
content: Quote from: Greybeard on November 17, 2020, 10:23:51 amI recall that too; they introduced a bug in 6.20. The only thing they fixed is Java for remote operation so 6.12 is fine otherwise.

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 20, 2020, 01:26:15 am
content: Quote from: nctnico on November 19, 2020, 05:07:25 pmCan you remember in which thread it was mentioned?Quote from: nctnico on November 19, 2020, 05:07:25 pm6.12?What was the Java problem?

author: HighVoltage
author_rank: Super Contributor
timestamp: November 20, 2020, 11:12:07 am
content: If you don't like, v6.20 you can always downgrade to 6.12

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 20, 2020, 03:28:35 pm
content: Quote from: HighVoltage on November 20, 2020, 11:12:07 amWhere can I download old versions?AFAIK on keysight's website is only latest 6.20 available:https://www.keysight.com/main/software.jspx?cc=DE&lc=ger&ckey=2211091&nid=-32976.771276&id=2211091Version history:https://www.keysight.com/upload/cmc_upload/All/Keysight_6000A_5000A_Oscilloscope_Release_Notes_0620.pdfCould not find version 6.12Is there a way to backup the old firmware from scope to PC or USB drive?I think I've seen it in the forum, but I cannot find it again.
A serious distortion occurs 25Mhz squre waveform by Rigol DG1022Z - Page 1
Forum section: electronics / testgear

author: uinika
author_rank: Contributor
timestamp: November 19, 2020, 10:49:33 am
content: A serious distortion occurs 25Mhz squre waveform by Rigol DG1022Z.My oscilloscope bandwidth is 200Mhz & 1GSa/S. I have no idea about this...

author: TurboTom
author_rank: Super Contributor
timestamp: November 19, 2020, 11:13:37 am
content: A quick glance at theDatasheetof this AWG reveals that its maximum specified frequency is 25MHz sine. Surprisingly, the manufacturer also specifies 25MHz square as the limit, yet with 10ns rise time @ 1Vpp amplitude. You selected at least 5Vpp and it's not clear what interconnection cable you used and if it was properly terminated at the scope. You should also keep in mind that, in order to reproduce a half-way decent square wavefrom, you need seven to ten times the bandwith of the square wave fundamental frequency on all the equipment used. And I'm pretty sure this requirement isn't already fulfilled by the generator.The consequences are: There are a few AWGs (specifically older ones) that contain a special trigger circuit and a separate output path to produce really clean square waves. But all the recent ones with pulse shaping, will deliver rounded edges at their upper square wave frequency limit. If you need a clean, high-frequency square, use digital gates or a dpecialized pulse generator. For everything else, the AWG is doing a good job.

author: Yansi
author_rank: Super Contributor
timestamp: November 19, 2020, 12:06:20 pm
content: But noone mentioned the integrated AWG ... yet.OP: Check if you have disabled the 20MHz input limit.And specify from what the 25 MHz square comes from.//EDIT: My reading error. The above stands. I thought that was an integrated AWG in the scope.
FSH3 power supply - Page 1
Forum section: electronics / testgear

author: WB4YVO
author_rank: Newbie
timestamp: November 20, 2020, 03:10:49 am
content: all, My power supply went bad NO output. Can someone tell me what voltage it needs?I think it 18V @ around 1 amp.. but is the center Positive or Neg? I certainly cannot afford 500.00 for a new supply..ThanksSkip

author: CJay
author_rank: Super Contributor
timestamp: November 20, 2020, 10:00:17 am
content: I'd suggest it's centre positive, all the pictures of FSH PSUs that have a marking seem to be, but why not crack open the PSU you have and work it out?It shouldn't be difficult to trace the circuit back to a smoothing capacitor and rectifier.
Teledyne Lecroy benchtop powersupplies = GW Instek rebrand? - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: October 02, 2020, 08:17:16 am
content: Hi guys,We're choosing a cheap power supply for the office, we already have a good, precise one, now for the cheap one that you use when you need 12-ish volts. I've been looking at the big distributors and noticed that Teledyne makes power supplies:https://www.mouser.sk/ProductDetail/Teledyne-LeCroy/T3PS43203?qs=sGAEpiMZZMvXcJVS4l7FPxRHe87hJVNjstU17d3LBjmE%252Bmwj3WGtiw%3D%3DHuh, neat!... wait a minute... I've seen that one before, just with a different logo. Another one is also mentioned in the datasheet and I saw that as well.https://sk.farnell.com/gw-instek/gpe-4323/dc-power-supply-4-channel-212w/dp/2930356https://sk.farnell.com/gw-instek/gpp-4323/power-supply-bench-prog-4ch-3a/dp/3236795Teledyne version: 516 EURGW version: 380 EURIs the lower end teledyne gear just rebranded lower cost stuff?Thanks,David

author: tautech
author_rank: Super Contributor
timestamp: October 02, 2020, 10:12:03 am
content: Quote from: daqq on October 02, 2020, 08:17:16 amSome, most certainly.Product D = Siglent SPD3303X

author: Hydron
author_rank: Super Contributor
timestamp: October 02, 2020, 11:24:21 am
content: Just a heads up - for the GPP series supply (style A) the Teledyne version comes with a LAN interface as standard I believe, however the GW Instek must have this ordered at the same time for another 30eur (it is fitted by GW Instek, in their Netherlands warehouse apparently).I ordered this combo from Eleshop yesterday and it is yet to ship (so I can't give any personal experience), sounds like others have had good impressions though.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 19, 2020, 10:26:36 pm
content: Just a curiosity: Do they make anything themselves? The scopes are Iwatsus, supplies are Instek...

author: tautech
author_rank: Super Contributor
timestamp: November 20, 2020, 01:53:45 am
content: Quote from: rvalente on November 19, 2020, 10:26:36 pmDunno where you've been looking as there's only 2 companies that are making scopes at 100+ GHz and LeCroy is one of them. AFAIK they make all their own bleeding edge equipment and use selected OEM's to provide their lower level equipment.https://teledynelecroy.com/oscilloscope/labmaster-10-zi-a-oscilloscopes

author: Sighound36
author_rank: Frequent Contributor
timestamp: November 20, 2020, 08:43:00 am
content: TT would know as Siglent are one of the ones that make the low order models especially in the last 12 months with Lecroy's introduction of of the Bench series equipment. Plus Siglent make some of the scopes as well.
Missing RF filer part of my Agilent E4401B? - Page 1
Forum section: electronics / testgear

author: merckhung
author_rank: Newbie
timestamp: November 11, 2020, 06:56:18 pm
content: Hi,I am wondering if the Agilent E4401B unit I got from eBay is missing part in its RF filer unit?Does anyone know what is supposed to be under the hood? Thank you.Br,Merck

author: AJ3G
author_rank: Regular Contributor
timestamp: November 11, 2020, 10:43:58 pm
content: I think what you see there is normal..

author: Greybeard
author_rank: Frequent Contributor
timestamp: November 19, 2020, 12:19:01 pm
content: Waveguide / hollow conductor ?

author: Yansi
author_rank: Super Contributor
timestamp: November 19, 2020, 12:21:14 pm
content: Nothing missing there. It is already in there - air dielectric
Keithley 195 fix - Page 1
Forum section: electronics / testgear

author: epitaxial
author_rank: Contributor
timestamp: November 19, 2020, 03:51:22 am
content: Not too long after being calibrated my Keithley 195 started acting up but only on certain ranges. Specifically the 1000v and 20v ranges. On the 1000v range the reading would fluctuate maybe +/-2 volts pretty fast so it was getting something at least. The 20v range was good except it would fluctuate +/- 30mV on but much slower and the majority of the readings were correct. Did a lot of poking around until finally I looked at pin 1 of U124, a CD4013. Lifting the pin revealed the that chip was outputting a square wave that was glitching, but not constantly.You can see it ghosting on a CRT scope and I captured the glitch on my digital scope. The meter works much better now and even the clock signal from the crystal looks cleaner. Before you could see the tops of the waves wiggling a bit. While I was ordering parts I decided to replace the filter caps and even the bridge rectifier for the +5 logic side. It's a 5 amp part but will burn your fingers after a while. It feeds an LM317 so even passing 1.5 amps it should't be that bad. The pcb is starting to scorch underneath itOverall I'm happy with the performance of the meter. The old calibration wasn't very far off and the readings are fast.
TDS 540 Probe Compensation - Page 1
Forum section: electronics / testgear

author: lucatz
author_rank: Contributor
timestamp: November 19, 2020, 12:54:34 am
content: Anyone have an idea as to why I get this pop-up (see pic) Also seems no matter what I press it always comes back on bootup right before the splash screen.Calibrated both Ch1 and Ch2 with the 2 probes I have and they both pass. Only Ch2 seems to be issue. To note I have re-capped this Scope.
Rigol MSO5074 to 2 computers via CAT-5 - Page 1
Forum section: electronics / testgear

author: LootMaster
author_rank: Regular Contributor
timestamp: November 18, 2020, 04:47:42 pm
content: What would be the optimal way to share an oscilloscope with 2 PC's via CAT-5?Besides disconnecting the wire in a already hectic place. IF disconnecting is required it will be done on my end behind my PC.passive or active switch?Only one will use at a time.Is this possible?

author: tautech
author_rank: Super Contributor
timestamp: November 18, 2020, 05:22:37 pm
content: If all on the same subnet an active switch should work.The scope should respond to commands regardless of where they're from.

author: mansaxel
author_rank: Super Contributor
timestamp: November 18, 2020, 05:50:42 pm
content: Quote from: LootMaster on November 18, 2020, 04:47:42 pmBuy a small Ethernet switch, and three cables. Connect 2 PC's and the scope to the switch. Done.
LeCroy scope timing revealed - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: November 27, 2020, 12:21:26 am
content: LeCroy waverunner 8404M is 4GHz scopes with good specs. When using two channels, it has memory depth of128 Msamples/channel and sample rate of 40 Gsamples/second.Other scope manufacturers, while providing lower memory and sample rate, claim up to 1 million waveforms,also known as frames, that can be captured in one second. This parameter may be important to capture rarerandom glitches, which is useful for debugging.LeCroy does not provide any info on number of waveforms/second, only stating that their scope can capturedata with rate of more than 1 million segments/second in "sequence" mode. As the attached pdf shows, it does not meanthat LeCroy scope can capture 1 million waveforms during one second

author: bob91343
author_rank: Super Contributor
timestamp: November 27, 2020, 01:24:35 am
content: So what's the point here?
HP8594A resets when trying to backup Correction Constants  - Page 1
Forum section: electronics / testgear

author: MARIOSSV0CL
author_rank: Newbie
timestamp: November 18, 2020, 09:24:58 am
content: HiI have HP8594A spectrum analyzer and i am trying to back up Correction Contansts but analyzer appears to reset when Edit Fflatness is initiated.Following service manuals instructions, using -37 Hz password, "srvc" appears on the left down corner, next if i push "VERIFY TIMEBASE" the Timebase Number appears and everything seems to going well but if i push "SERVICE CAL" to retrive Flatness Data a warning message appears "FACTORY CAL DATA CAN BE LOST".If i continue pressing "EDIT FLATNESS" the analyzer reset and retern to normal use contition.S.N: 3108U00130Rev: 17.12.90Can you help me please??Thank you in advance.Marios
Tektronix TDS5000 TDS 5054 ACQUISITION MEMORY UPGRADE 2M - Page 1
Forum section: electronics / testgear

author: harrimansat
author_rank: Regular Contributor
timestamp: November 27, 2017, 11:04:10 am
content: Hi,I have a tds 5054, somebody knows how upgrade acquisition memory, and where is located?ThanksRegars!

author: harrimansat
author_rank: Regular Contributor
timestamp: November 27, 2017, 07:16:14 pm
content: It seems that is only a question of keysoft, hardware is the same for all.http://download.tek.com/manual/075081200.pdfMinimum Tool and Equipment ListRequired tools and equipment Part numberUSB or PS-2 Keyboard 118-9402-00or equivalentKit Parts ListOption QuantityPartnumber DescriptionAll 1 each -- -- --* LABEL, OPTION INFORMATIONAll 1 each 075-0812-xx MANUAL, KIT INSTRUCTIONSAll 1 each 020-2450-xx SOFTWARE KIT, OPTIONAL APPLICATIONS *J2 1 each 071-0815-xx MANUAL, USER, OPTION

author: harrimansat
author_rank: Regular Contributor
timestamp: August 18, 2019, 08:14:34 am
content: Instrument Upgrades:Acquisition memory upgrades equivalent to options1M and 2M and software upgrades equivalent tooptions 2A, J1, and J2 can be ordered to extendinstrument performance after initial purchase. Userscan install upgrades WITHOUT OPENING the instrumentcase or requiring on-site service. Order a TDS5UP andthe appropriate option(s) listed below.

author: thorswait
author_rank: Contributor
timestamp: November 18, 2020, 03:32:53 am
content: You may also want to take a look at the extremely good job TiN did in order to add some extra features to your device. This thread might interest youhttps://www.eevblog.com/forum/testgear/tek-csa7404-repair-project/250/
Cheap and tiny "15W" USB based power supplies - Page 1
Forum section: electronics / testgear

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: November 17, 2020, 03:42:54 pm
content: Recently, there's a new kind of gimmick popping up on eBay, namely tiny USB based power supplies.This seems to be the most sophisticated one and even includes current control.This red one is usually sold for slightly less than 7€ (or around 8€ including P&P). There's also a cheaper one in blue color with simple LED display. Of course there are also different other types but these seem to be the most interesting ones.Technical specs are a bit contradicting. It's either 1-24V or 1-30V, but even 1-24V would be totally OK for a small device like this.Admittedly, they are probably noisy and the 15W "maximum" seems a tad optimistic, but even with a few hundred mA and a bit of noise, this looks like a pretty cool thing to supply small projects on the go.Hm, uploading a PNG failed completely and embedding the picture didn't work either.
PeakTech 2180 | Hikari HX-110 - Page 1
Forum section: electronics / testgear

author: Trader
author_rank: Frequent Contributor
timestamp: November 15, 2020, 02:25:10 am
content: Are there other manufacturers doing the same model?Seems a DMM very complete because of the 600uH Inductance.http://www.hikariferramentas.com.br/medidor-lcr-digital/274/104/https://www.peaktech.de/productdetail/kategorie/lcr-messgeraet-mit-dmm/produkt/peaktech-2180.html

author: Fungus
author_rank: Super Contributor
timestamp: November 15, 2020, 02:58:12 am
content: It has a built-in LCR meter?Seems like a compromise to me. Why not buy a separate LCR meter? It will be a lot more capable (user interface of an LCR meter is very different).https://www.eevblog.com/forum/testgear/what-lcr-meter-should-i-get/

author: Trader
author_rank: Frequent Contributor
timestamp: November 15, 2020, 04:22:44 am
content: Yes, capable to measure Resistance, Capacitance, and Inductance. Don't need to be perfect.

author: Fungus
author_rank: Super Contributor
timestamp: November 15, 2020, 05:36:09 am
content: Quote from: Trader on November 15, 2020, 04:22:44 amThe only weak point I see is that current only goes to 600mA.If that's OK for you then sure, why not?

author: Trader
author_rank: Frequent Contributor
timestamp: November 15, 2020, 06:50:16 am
content: I agree, is too low. I'm just wondering if there are more DMM+LCR like this one. Thanks.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 16, 2020, 05:32:46 pm
content: Hikari ferramentas, Braziliam rebranded...What is the measuring freq? 100hz? 1KHz?Usually LCR meters when measuring resistance uses a constant current or AC signal?
Siglent SDS2000X-E Color Intensity Grading? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: November 15, 2020, 07:54:01 pm
content: Can anyone confirm if the 2352X-E has color intensity grading? (For some reason the datasheet and manual are not as specific about this as on the 1000X-E series). Thx

author: tautech
author_rank: Super Contributor
timestamp: November 15, 2020, 10:19:00 pm
content: Sure does.See Defpoms video here:https://youtu.be/7zJ8X51l0Go?list=PL2z3V9RkHQE0ntjTgr_Nkpv4XRaH_iT2o&t=2595

author: rf-loop
author_rank: Super Contributor
timestamp: November 16, 2020, 03:46:58 am
content: Reepeating @tautechAbsolutely sure it have.All Siglent X models have intensity gradient and color gradient display (all Siglent SPO aka DPO models have this)Obsolete 1000X/X+Current* 1000X-E, X-CCurrent* 1104X-UCurrent* 2000X-ECurrent* 2000XCurrent* 2000XPlusCurrent* 3000XCurrent* 5000XCurrent* 6000XProThese older models (Some still currently available depending area)Do not have. They are not DPO, they are classic traditional capture-display-capture-diplay principe DSO.Current* SDS1000ACurrent* SDS1000E+/F+Current* SDS1000CNL+/DL+*)Current here mean that Siglent is currently doing these but it not mean they all are currently available in your area.
USB Powered Active RF Probe  - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 15, 2020, 03:12:20 pm
content: All:I am running a scope which has no probe power jack. It does however have two USB ports. I wonder if there are any offerings someone could point me to for an Active Probe, which is pre wired for USB connection for DC Power?Rich

author: Noy
author_rank: Frequent Contributor
timestamp: November 15, 2020, 03:46:22 pm
content: Would also be interested in.But my approach will be a respin of the poor man active Probe design with OPA695 and add a "USB Power supply" input. But hobby build time is short currently

author: AJ3G
author_rank: Regular Contributor
timestamp: November 15, 2020, 04:01:17 pm
content: Hi Noy -Yes there are a few kits and some circuit diagrams of probes which would work. I have yet to find one which is a commercial product, that has been adapted to accept USB power. If it exists, then I am sure someone here knows about it!Rich
Manual needed for Power Mate Corp "Lectra-Load II" LL300B - Page 1
Forum section: electronics / testgear

author: Avinoam
author_rank: Newbie
timestamp: November 16, 2020, 06:01:39 pm
content: Looking for a user manual or service manual for a Power Mate Corp "Lectra Load" electronic load, model LL300B. A scan or link would be much appreciated!

author: nssouza
author_rank: Contributor
timestamp: November 17, 2020, 11:14:20 am
content: Hi, AvinoamAnyone that needs the usar/service manual, look at the following link:https://bama.edebris.com/manuals/rte-power-mate/LL300B/Best regards
RSA3000 Custom Calibration Kit Problem - Page 1
Forum section: electronics / testgear

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: October 27, 2020, 10:35:08 am
content: I'm trying to use the approach suggested herehttp://www.hhft.de/index.php?page=competences&subpage=calibrationfor a low-budget custom calibration kit for a Rigol RSA3000 series VNA.However, I have a problem: the approach says to set (ignoring Open and Thru which are not a problem)Match / Load (female): Offset Length: 0 mmShort (female): Offset Length: 1.96 mmbut unless I am missing something, on the RSA3000, it does not seem possible to set an offset length for Load - it seems that whatever value you put in for Short is also used for Load, with no chance to set it differently.Any helpful observations welcomed. Thanks.

author: ted572
author_rank: Frequent Contributor
timestamp: November 13, 2020, 09:34:38 pm
content: It isn't necessary to set a location for the 50 Ohm Termination. The Open and Short Positions set the Reference point for the Measurements. Your measurement will be at the actual Reference Position determined by where the Short/Open were set. You normally use an Open and Short that are each at the exact same distance, and the 50 Ohm Termination should have a very high Return Loss (preferably at least -45 dB). These are the basic reasons why the VNA Calibration Kits are so expensive.

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: November 13, 2020, 10:41:33 pm
content: Thanks Ted, you are quite right. The user interface is a bit dicky, but the device works as expected, with zero offset for load, as I confirmed in a chat with Rigol's engineers.
Underdamped sine wave generator with thyristors - Page 1
Forum section: electronics / testgear

author: iraquois
author_rank: Contributor
timestamp: October 01, 2020, 07:58:12 pm
content: I am trying to design a circuit to generate underdamped sine wave (actually it is a basic lc tank with switching pulse. I tried to switch a simple RLC circuit with mosfet switch, but Unfortunately I got so much distortions.).I have a circuit which people say that it was working once. So I tried to simulate it but it is not working in simulation.Problems I got:1)Even if I increase V3 to 100V, Underdamped sine wave starts from 15V.2)And a big problem is that I see this wave even If I don't send pulse from V2. (Breakdown voltage of SCR is 600V)I am not sure if this is the proper way for this purpose. If someone has any idea about this circuit or another circuit idea please share. Thank you for reading.

author: iraquois
author_rank: Contributor
timestamp: October 12, 2020, 05:25:26 pm
content: Actually this circuit is working I tried this. But I see some distortions. So I decided to try another way. It was just replacing "thyristor and diode" with a relay. So finally I could let L and C create damped sine wave. But with this method I got weird results. Or is it possible that I did something wrong? Tomorrow I will try it again.But in case that it won't work, can you suggest me another way if you know? Maybe I can try it with an optocoupler?Or should I completely change the topology

author: iraquois
author_rank: Contributor
timestamp: November 18, 2020, 07:41:21 am
content: With the schematic I shared before it is possible to acheive 1kHz - 1MHz damped sine wave with damping factor of 15. But right now, I think the hardest one, I am trying to generate 90MHz damped sine wave with Q factor of 15 (means between first peak and the cycle which is %50 of first peak, there should be 3 cycle at least) . I tried this with 25nH inductor and 125pF capacitor. Damping factor seems okey. But problem is, as you can see in the oscilloscope screen, first peak occurs after 3 cycles. Now I think possible explanation is that; Since my capacitor and inductor is very low, even my layout and inductance of the relay can effect the result (also inductance of my capacitor and capacitance of my inductor).What kind of relay, inductor and capacitor should I use. Should I use handmade capacitor and inductor ? And for the relay since they have at least 10 - 20nH inductance is it possible to use manual switch? for example directly make capacitor and inductor touch together manually.

author: Berni
author_rank: Super Contributor
timestamp: November 18, 2020, 09:43:55 am
content: At these speeds physical circuit construction is more important than the schematic. Even the way you tap off or probe the signal might affect its shape.If i had to do this i would mostly likely build that single transistor Jim Williams picosecond pulse circuit and run that into a tight compact LC circuit.
Why are testgear screens/displays so rubbish? - Page 1
Forum section: electronics / testgear

author: Fungus
author_rank: Super Contributor
timestamp: November 13, 2020, 06:30:14 am
content: What's the problem with screens/displays on test gear?It seems like even the cheapest DT830 multimeter has an awesomely black display with zero viewing angle problems where multimeters that cost hundreds of $$$ struggle to be readable? Dave's even done videos on fixing them by changing capacitors in his BM235.Similarly TFTs, I use loads of $2 cheap-ass TFTs from aliexpress with my Arduinos and they never have problems with brightness or viewing angle but many expensive oscilloscopes seem to struggle to be readable if you're not viewing them optimally.What gives?

author: hugo
author_rank: Regular Contributor
timestamp: November 13, 2020, 07:23:13 pm
content: Can your $2 cheap-ass TFTs from aliexpress do 50,000 waveform updates per second?

author: Fungus
author_rank: Super Contributor
timestamp: November 13, 2020, 07:29:14 pm
content: Quote from: hugo on November 13, 2020, 07:23:13 pmNeither can you DSO. It probably runs at 60Hz like the $2 cheap-ass TFTs from aliexpress do.

author: HKJ
author_rank: Super Contributor
timestamp: November 13, 2020, 08:18:27 pm
content: Quote from: Fungus on November 13, 2020, 06:30:14 amI do not agree, I have a large pile of test gear and most have decent or good displays. There are exceptions like the Fluke 289 with a very low contrast display (Reason: lots of segments*), but generally the displays are good.* More phases on a LCD display means lower contrast, how serious this is depends on the starting point.
Tektronix MDO4000C Bandwidth Upgrade process - Page 1
Forum section: electronics / testgear

author: supperman
author_rank: Regular Contributor
timestamp: December 22, 2019, 07:20:59 am
content: Sorry guys if I am incorrectly starting a new thread.. but I'm rather sure I read through everything on the MDOs and there is very little information on the 4k series - at least in one place.I see that some people have had some success using MDO3000 type key-gen software on the 4000c and some have not. and I have seen screenshots of 1GHz pulses on 4024Cs.. And now I think I'm imagining things.. but I thought there is no hardware difference between the 200mhz model and the 1ghz model.. yet Tek requires the instrument to be sent in for all bandwidth changes.Can someone let me know if a MDO4024C can be turned into an MDO4104C without hardware changes using the key-gen system? What firmware works / does not work (downgrade needed?). Is it really the same as the MDO3k? What are the differences?Many thanks!

author: darkstar49
author_rank: Frequent Contributor
timestamp: November 13, 2020, 01:45:45 pm
content: Quote from: supperman on December 22, 2019, 07:20:59 amthere's no black & white answer to that question... cf. below:https://www.eevblog.com/forum/testgear/someone-has-hacked-mdo4000c/msg1464991/#msg1464991
Sencore SC3100 Want to Purchase Probes with DVC  - Page 1
Forum section: electronics / testgear

author: bOTL
author_rank: Newbie
timestamp: November 13, 2020, 12:37:26 am
content: HelloI would like to purchase 2 Probes for a Sencore SC3100 with the DVC option.If anybody has a pair or knows where I can get them please let me know.TIA
Does anyone have a manual for a Hickok 334 Digital Multimeter? - Page 1
Forum section: electronics / testgear

author: Stray Electron
author_rank: Super Contributor
timestamp: November 12, 2020, 11:28:40 pm
content: Looking for a manual that shows how to adjust the internal adjustments. This interesting looking meter dates from 1978 and uses what appears to be four Nixie tubes for the display but they're actually blue-green Vacuum Florescent displays built in individual glass tubes.
34970A displays for $25! (USA) - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: November 12, 2020, 12:47:30 pm
content: If you need a new display for your 34970A, you can't beat this price!https://www.ebay.com/itm/254776027270?No affiliation.EDIT: Odd that 3 of the pictures don't match, though. A tube from something else, possibly a 34980A
TDS3014B upgraded to 600MHz - Page 1
Forum section: electronics / testgear

author: Shiv
author_rank: Regular Contributor
timestamp: November 11, 2020, 09:37:59 am
content: Hi all, sorry but, for now that´s only a clickbait to ask.I have a TDS on sight, but it have encoder problems... (works ok, but there are repaired and could fail again)The price for the TDS is good, but it isn´t for the replacement board (to make it new)I have oscilloscopes at work so I don´t need more than 100-200 MHz at home.The question is...What would you pay for something like that?It´s for calculate how much I can spend on it.The instrument is in good condition and I will upgrade it to 3064B, add tek probes (TPP0200 and P6139A) and run a full 600MHz calibration/adjustment at work (Metrology center, it could be traceable certified)If somebody is interested, please tell me what will you spend for that.Seeing ebay I´m thinking about 800-1000 as it is or go up with a brand new board. (350-450 bucks)

author: eplpwr
author_rank: Regular Contributor
timestamp: November 11, 2020, 06:24:57 pm
content: US$ 20-30 would be sufficient for a quality encoder.Thanks for the clickbait, NOT.

author: Shiv
author_rank: Regular Contributor
timestamp: November 12, 2020, 08:09:38 am
content: Quote from: eplpwr on November 11, 2020, 06:24:57 pmThanks for the answer, but NOT.These aren´t normal encoders mounted ONboard, these are INboardhttps://www.eevblog.com/forum/repair/tds3000b-tds3054b-strange-type-rotary-encoder-repairreplacement/
Anyone that has experience with Label List in R&S RTB2000 series oscilloscopes? - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: November 11, 2020, 08:50:34 am
content: Hi everyone,For a project, I am trying to use a label list for a serial protocol on the RTB2004. But even when I try to load the label list example provided in the instrument's manual, it does not seem to work.So, the CAN protocol label list example in the most recent RTB2000manual(page 242) is as follows:# ----------------------------------------------------------------------------@FILE_VERSION = 1.00@PROTOCOL_NAME = can# ---------------------------------------------------------------------------# Labels for CAN protocol# Column order: Identifier type, Identifier value, Label# ---------------------------------------------------------------------------11,064h,Diag_Response11,1E5h,EngineData11,0A2h,Ignition_Info11,1BCh,TP_Console11,333h,ABSdata11,313h,Door_Left11,314h,Door_Right29,01A54321h,Throttle29,13A00FA2h,LightState29,0630ABCDh,Engine_Status29,03B1C002h,Airbag_Status29,01234ABCh,NM_Gateway# ----------------------------------------------------------------------------And, according the manual, it should result in a loaded table list like this:[ Specified attachment is not available ]Yet, when I load that example into my own oscilloscope, I get the following instead:[ Specified attachment is not available ]The IDs and addresses are not the same... Now if we look at the one with label 'ABSdata', we note that the data file specifies value '333h', where the suffix 'h' indicates this is a HEX value (see also the manual, page 307). But in the actually loaded table, we see '014D', which is the HEX equivalent for thedecimalnumber 333d.It seems as if when the instrument is instructed to read HEX values, yet it reads them as if they were DEC values (and ignores anything with characters A thru F).Anyone experiences using the label list feature, or anyone willing to test the above example to see whether he or she gets the same list?

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: November 12, 2020, 09:06:56 am
content: Just figured out that, for my current project, I can of course just manually compute all HEX numbers into DEC numbers and instead put these into the input file for the RTB, and thus 'fool' the instrument. It's a nuisance and a loss of time (especially for longer ranges of numbers), but it works.But I feel would still be preferable that the instrument would process the input file as specified in the documentation, and the sample code that Rohde and Schwarz provides in its manual actual works on the instrument...
Hantek DSO5072P Pulse capture - Page 1
Forum section: electronics / testgear

author: pmlapl
author_rank: Newbie
timestamp: November 11, 2020, 11:17:57 pm
content: I want to capture a single pulse with a Hantek DSO 5072p. The problem is that it is only a single pulse, not a wave form. It has a single sequence function that I've messed with but haven't been able to make it work with a single pulse. Does the scope actually have the capability to do what I want? Thanks in advance for help and or suggestions.

author: tautech
author_rank: Super Contributor
timestamp: November 12, 2020, 07:33:27 am
content: Quote from: pmlapl on November 11, 2020, 11:17:57 pmWelcome to the forum.QuoteAny DSO should be able to eat this for breakfast !For captures like these we use a slowish timebase (say 20 or 50ms) with an edge trigger setting (rising or falling as required) and Single shot mode. The display will go blank untilyourset trigger conditions are met then and only then you will have your capture !Once captured you can zoom in on it for greater inspection or save it to a USB stick.Others might use a Normal trigger setting as as normal with an edge trigger set to rising or falling as the case requires. Normal and Single both have their uses and user preference for either.Post a screenshot when you capture it successfully.

author: pmlapl
author_rank: Newbie
timestamp: November 12, 2020, 04:04:33 pm
content: Thanks for the reply. I think I got it. I changed the trigger to normal instead of auto. Seems to work now.
Question related RTB2000: search pattern - Page 1
Forum section: electronics / testgear

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 11, 2020, 07:27:35 pm
content: Hello to the RTB2000 expertsIs it possible to search for an I2C pattern with this search function - e.g. a specific response from an I2C slave ?I2C option is enabled on my device.Does anyone know this ?br,Frank
Hickok 1890M in-circuit transistor tester (1965 portable military unit) - Page 1
Forum section: electronics / testgear

author: trobbins
author_rank: Frequent Contributor
timestamp: November 11, 2020, 04:31:25 am
content: I'm getting ready to go through a calibration of a Hickok 1890M transistor tester using the Technical Manual.A preliminary check years ago identified some slight stiction in the meter, which I have just attempted to remove and appears ok now. The meter was hermetically sealed, and required some effort to access - and that now doesn't allow the original cover to be nicely cinched back on around the perimeter, but as it isn't doing any more military service then that won't matter. The meter coil uses a single bearing for ruggedness, so I dropped in some IPA to the two end access slots in the hope that that may seep in and flush the internal bearing surface. I also identified the rear hairspring had one turn out of place, which was easy to return to normal. I can't detect any stiction now so here's hoping.I also replaced the primary batteries with three external plug packs and an internal regulator board using LM317L regs to provide the three isolated battery taps/groups (0-22.5V; 0-3.0-4.5V; 0-1.5-3.0-4.5V).One hurdle I'd like to jump is to get a full circuit schematic diagram if anyone has that. The Tech Manual only has some abridged schematics related to a few circuit functions, and as this tester is a more advanced version of the Hickok 890 tester (which has an available schematic), the extra circuitry is a lot harder to track through all the extra switches, switch wafers, and parts.Ciao, Tim
My first impression of RTB2004   - Page 1
Forum section: electronics / testgear

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 10, 2020, 04:44:34 pm
content: Hello everyone,today I received my RTB2004, it makes a good impression, but what I find a bit strange are the spongy buttons.I am not sure if I can get used to it.At work we have Tektronix oscilloscopes, ok they are approximately 5 years old, but they have "normal" buttons.Is this the case with all Rohde & Schwarz instruments ?What is it like at Siglent and Rigol ?I couldn't test it before, I live in a rural area and Covid-19 prevented me from travelling.br,Frank

author: Fenstergucker
author_rank: Regular Contributor
timestamp: November 10, 2020, 05:11:28 pm
content: If you press the keys on the upper edge, it is better. Right in the middle you have to press relatively hard. At least this is the case with my RTB2000.Peter

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 10, 2020, 07:55:55 pm
content: Quote from: Fenstergucker on November 10, 2020, 05:11:28 pmright Peter, that works a little better, thanks.
E-field probe - Page 1
Forum section: electronics / testgear

author: hulk69
author_rank: Contributor
timestamp: November 10, 2020, 10:17:16 am
content: HelloI am looking for a way to quantify the E-field value of the output of my pre-compliance radiated immunity home made bench (signal generator 0-3GHz > 20W amplifier -> antennas) an d was interested in quantifying the E-fieldSo I looked at what kind of gear is usually used and this is the most common one:HI-6006 from ets-lindgrenLooks great but >$3000I had a look at some consumer product like the TM-190but it appears to be more like a toyany suggestion on a budget up to 1000$

author: hulk69
author_rank: Contributor
timestamp: November 10, 2020, 11:49:49 am
content: Now that I though about it I think all I need is another calibrated antenna with the antenna factor known -> plug it to my spectrum analysereg.https://aaronia-shop.com/products/radial-isotropic-antenna-bicolog-5070Add the antenna factor to the measured field => get my V/m plot with frequency (which is actually much better)
ANENG  AN888S Multimeter - Page 1
Forum section: electronics / testgear

author: craig.shaw@internode.on.n
author_rank: Newbie
timestamp: November 07, 2020, 01:38:25 am
content: Can anyone tell me which type of battery should be used. Protected or unprotected LiIon batteries? The manual implies unprotected, but they dont seem to charge!
Fluke 105 Series II Scopemeter question - Page 1
Forum section: electronics / testgear

author: Andrei__1
author_rank: Newbie
timestamp: March 05, 2018, 07:49:54 pm
content: Hi all,I have bought a Fluke 105 Series II 100 MHz Scopemeter for an equivalent of 130$ in very good (close to perfect) condition, with probes, test leads and vinyl case, no charger and no original battery. It works perfectly.I have a curiosity about it. Running either on alkaline batteries or on NiMh 4000 mAh C type rechargeable batteries, the Scopemeter doesn't go into energy save and when I turn on the LCD backlight it says that it is running on power adapter.Do you have any ideea why?It doesn't look like it was repaired or that it has any issues. I have some photos but I can't attach them.Thank you!

author: harrimansat
author_rank: Regular Contributor
timestamp: November 06, 2020, 07:16:12 pm
content: Do you still have the scopemeter?
HP 8648 Schematics - Page 1
Forum section: electronics / testgear

author: deepskyridge
author_rank: Regular Contributor
timestamp: March 28, 2016, 11:12:20 pm
content: Anyone know where to get a copy of the service manual for the 8648 with the schematics ?I have tried lots of internet sources and none of them have schematics.ThanksGar

author: deepskyridge
author_rank: Regular Contributor
timestamp: March 29, 2016, 05:47:43 pm
content: thanks for the links, neither document has actual schematics.still looking.Gary

author: Neganur
author_rank: Unknown
timestamp: March 29, 2016, 06:52:17 pm
content: I believe that series of signal generators actually doesn't have CLIP nor schematics released.This is pure module swapping in the service centre.

author: UA3BL
author_rank: Newbie
timestamp: April 28, 2017, 11:06:29 am
content: Hello deepskyridge, have you found the schematics of 8648B?

author: deepskyridge
author_rank: Regular Contributor
timestamp: April 28, 2017, 01:33:14 pm
content: NO, Apparently HP did not issue CLIP documents for these generators. I got mine fixed without them.Gary

author: UA3BL
author_rank: Newbie
timestamp: November 11, 2020, 09:08:31 pm
content: Hello, can anyone say what inside 1GG3-4202 is?
Keysight U1282U Temperature in Secondary Display in Degrees C Only? - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 01, 2019, 03:03:52 am
content: All:I have reviewed the manual, and spoken with an applications engineer at Keysight regarding the subject line. I just received a U1282A. The ambient temperature in the secondary display only reads Degrees C. My understanding is this is the ambient temperature collected from a sensor located inside the 1282A. The only time I am able to get the secondary display to read Degrees F, is when I turn the rotary switch to the TEMP position and press RANGE both the primary and secondary display Degrees F, but if I turn the rotary switch CW/CCW to another mode the secondary reverts back to Degrees C.I have also gone into the menu and attempted to change the “Unit” from C - F to just Degrees F. No matter how long I press the SAVE button the change in this menu is not accepted, and I revert back to the default setting.While reading the manual, I do see that changing parameters in the “Unit” menu may be restricted based on the country you live in. This multimeter was shipped from a major United States Keysight Vendor, to the United States, so I do not see how this restriction would apply to this Multimeter.I am running Firmware Ver 1.05 which is the latest from Keysight. The application engineer I spoke to agreed this should not be happening, but wanted me to write my findings up so he could send it up to a higher tier of technical support. Before getting folks at the factory spun up on this write up, I wonder if anyone here can confirm what I am seeing? If so, were you able to overcome this issue, and how?Thanks in Advance!

author: AJ3G
author_rank: Regular Contributor
timestamp: November 09, 2019, 09:07:15 pm
content: Just thought I would update - I have sent this issue to the product support team. Hopefully it can be resolved with a firmware upgrade, and I do not have a meter where this feature is disabled.

author: AJ3G
author_rank: Regular Contributor
timestamp: November 06, 2020, 12:44:57 pm
content: Just an update - Still no release of firmware which resolves this issue. I had reported it last November.Rich
BTMETER BT-6688B Insulation Resistance / Hi-Pot Tester? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: October 20, 2020, 06:10:09 pm
content: Anyone here got an opinion on this model (or equivalent)?It seems most of these "Amazon-grade" (i.e., cheaper) hi-pot testers top out at 2500V but this model goes to 5KV. For my work the 5KV range is necessary.Thanks...

author: Tjuurko
author_rank: Regular Contributor
timestamp: November 06, 2020, 10:57:27 am
content: We use HoldPeak HP-6688B for our work.A voltage of 5 kV was used very rarely.https://www.holdpeak.com/5000v-digital-insulation-resistance-tester-hp-6688bThere are several more devices in this case:AOPUTTRIVER AP-6688BINFURIDER YF-6688B
EA Elektro-Automatik bench PSUs - Page 1
Forum section: electronics / testgear

author: London Lad
author_rank: Regular Contributor
timestamp: November 05, 2020, 01:46:38 pm
content: Has anyone had any experience of the EA 9000 series power supplies, like this one :-https://elektroautomatik.com/shop/en/products/programmable-dc-laboratory-power-supplies/dc-laboratory-power-supplies/series-ps-9000-t-br-320w-up-to-1.5kw/Or links to reviews or teardowns ?

author: Martin72
author_rank: Super Contributor
timestamp: November 05, 2020, 11:48:57 pm
content: Hi,With this one not, but we got several supplies from EA, good quality though, the last we´ve bought from them was a 0-80VDC/3KW supply.But they´re two annoying things on it, which could be also appear on this you´ve linked here.Booting time (...god, this is a supply and you have to wait a little bit after turning it on) and last state memory - If you switched it "hard" off but don´t switch off the output before, on the next "hard" turning on, it will switch on the output automatically...Sometimes not so good.

author: London Lad
author_rank: Regular Contributor
timestamp: November 06, 2020, 08:06:13 am
content: Thanks for the info. The boot with OP on could be a pain. I'll look into that
Yay! Just ordered my new poorman's 12V bench power supply! - Page 1
Forum section: electronics / testgear

author: DW1961
author_rank: Frequent Contributor
timestamp: November 06, 2020, 04:11:30 am
content: Check it out!https://www.amazon.com/dp/B08HMRSP9QLOL Well, at least I can test 5V LED strips!
Looking for a Manual for the DISA 55 M25 Linearizer - Page 1
Forum section: electronics / testgear

author: justanothername
author_rank: Regular Contributor
timestamp: November 07, 2020, 03:44:14 pm
content: I recently got this, it is an unit to linearize sensor reponses. Originally used for anemometer measurements.The unit is working well, I could bend sawtooth signals. But I have no idea what the settings supposed to do exactly.Anyone got a manual for this exotic thing?
RTB2000: internal  hardware calibration detected an error - Page 1
Forum section: electronics / testgear

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 05, 2020, 08:10:32 am
content: Could it be that Rohde & Schwarz had problems with the first RTB2000 devices ?I have already heard of 2 cases where the internal hardware calibration detected an error and the RTB had to be sent in.br,Frank

author: uski
author_rank: Frequent Contributor
timestamp: November 05, 2020, 11:57:00 am
content: Quote from: Frank_MV on November 05, 2020, 08:10:32 amAbout to buy an RTB2000 myself. Were these early units ?

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 05, 2020, 06:29:07 pm
content: I know of a device that was probably bought in 2018. Maybe it has had a hardware problem. The RTB should have detected an error during the self-calibration test and created an error log. The device have been exchanged for a new one. Unfortunately I do not know details.It is possible that the first batch had problems.Of course this can always happen, with every manufacturer.It is only annoying when the warranty has expired.

author: maginnovision
author_rank: Super Contributor
timestamp: November 05, 2020, 06:31:37 pm
content: I have a launch bundle and no issues here. Works like the day I got it(the bugs never affected what I do).

author: Frank_MV
author_rank: Regular Contributor
timestamp: November 05, 2020, 06:58:39 pm
content: This is nice
LeCroy service menus & ADC temperature readings - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: October 30, 2020, 10:03:03 am
content: I think to remember having seen some menu where the ADC temps were shown... but I can't find it anymore, maybe it was just a dream...Got some heating/fans problem in a WaveRunner, and I'd like to check whether the ADCs are getting too hot or not.

author: smaultre
author_rank: Regular Contributor
timestamp: November 03, 2020, 02:04:16 pm
content: Its present, but displayed on HEX. 9472>Service>Aladdin..>Temperature

author: darkstar49
author_rank: Frequent Contributor
timestamp: November 03, 2020, 08:14:14 pm
content: Aha... that’s probably why I didn’t find it... this XI-A has a Magellan board (the red ones)I’ll check again, but I’m pretty sure they didn’t provide this for that board...