hybridfree/eevblog-posts huggingface dataset:
A new solution for 10Mhz-10Ghz portable Vector Network Analyzer  - Page 1
Forum section: electronics / testgear

author: zasml
author_rank: Newbie
timestamp: December 06, 2021, 07:42:22 am
content: Does any one pay attention to the new solution from ADI ?I love the Bidirectional coupler inside this chip~https://www.analog.com/en/products/adl5960.html

author: tautech
author_rank: Super Contributor
timestamp: December 06, 2021, 08:21:57 am
content: Yep seen it a few months back..........

author: jjoonathan
author_rank: Frequent Contributor
timestamp: December 06, 2021, 01:04:58 pm
content: Yes, but I didn't see any pricing info then and I still don't see any pricing info now... but given that this is ADI, I'm inclined to suspect that the price is somewhere between "barely better than the alternative" and "lol."Hope springs eternal, though!

author: DaJMasta
author_rank: Super Contributor
timestamp: December 06, 2021, 05:35:29 pm
content: 1-100MHz IF bandwidth means your wide span measurements are going to work well but you aren't going to see anything when you zoom in. I guess the application is with wideband communications equipment that needs so much bandwidth that you get reasonable resolution with a 1MHz IF bandwidth.

author: coromonadalix
author_rank: Super Contributor
timestamp: December 06, 2021, 06:07:23 pm
content: An evaluation board at 279$ usd loll

author: jjoonathan
author_rank: Frequent Contributor
timestamp: December 06, 2021, 08:48:28 pm
content: Wait, eval board at 279? Are you sure there isn't another zero on there? That's, like, the price of an eval board for a good op amp. Maybe it will be priced to shake things up after all.

author: DaJMasta
author_rank: Super Contributor
timestamp: December 07, 2021, 01:10:39 am
content: Yeah, $279 for anything close to a VNA with 20GHz of bandwidth is unprecedented pricerange, even if the application and performance is more limited.

author: zasml
author_rank: Newbie
timestamp: December 07, 2021, 01:40:37 am
content: the analog if bw is 1Mhz～100MHz，but you can get much narrow if bw with digital processing...，there should be two ADCs follows after ADL5960.Two ADL5960 can make 4 port VNA.
Yihua 959D+ Rework Station? - Page 1
Forum section: electronics / testgear

author: Ckpage86
author_rank: Newbie
timestamp: December 06, 2021, 11:09:48 pm
content: Just curious if anyone has recent first hand experience with the Yihua 959D+ rework station.https://www.amazon.com/YIHUA-959D-Digital-Efficiency-212°F-932°F-Iron-burn/dp/B08BK3M6YW/ref=asc_df_B08BK3M6YW/?tag=hyprod-20&linkCode=df0&hvadid=459719488307&hvpos=&hvnetw=g&hvrand=2647433764149049384&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9052681&hvtargid=pla-1153644555592&psc=1I have been learning about the cheaper 858Ds the last couple days and it seems they are pretty hit and miss in terms of construction/safety depending on what badge it wears. Watching teardowns, and other videos have been pretty helpful in understanding what I might be in for on these guys. Although, a lot of info I am finding online and in this forum is 5-8 years old, I would hope improvements have been made since then, hence the question here.I also found the 959D+ models, which have the presets that I think would be pretty useful, and looks like a nicer station. The reviews on the Yihua seem pretty positive overall, but I haven't seen anyone mention details about the internals and construction of the thing. Just curious if anyone here might have some insights. The listing says it has a US plug, but if that is wired right I don't know.Does Yihua produce these and other companies rebadge them, or is the Yihua a rebadge of something else? I have also found several brand variants of the 959D+ that are a little cheaper. Does the Yihua version provide for a higher quality product?
Rigol MSO5074: Why it triggers only on one type of edge - Page 1
Forum section: electronics / testgear

author: listerreg
author_rank: Newbie
timestamp: December 05, 2021, 01:30:42 pm
content: Hi everyone,I've just bought this oscilloscope and I'm trying to understand why when I set the edge trigger to "either" it usually catches constantly only the rising or only the falling edge in the Run mode.I've got a simple sine wave generated by a DAC with the frequency of about 4Hz. All the oscilloscope settings are default besides the edge triggering is set to either slope and the trigger level is in the middle of the signal envelope.When I set the scale so only quarter of the period is captured I have this somewhat straight line on the screen. The thing is that it is usually not changing from rising to falling repeatedly but only one "type" is displayed.I can actually change which part of the wave is displayed (the rising or the falling slope) with some irrelevant actions like pressing a menu button.If I want all the occurrences of the rising and falling slopes in the wave to be displayed repeatedly I had to "zoom" the scale so only 1/10th of the period is captured.Why with a such low frequency signal the oscilloscope is not triggering on the actual next slope?Thanks

author: tooki
author_rank: Super Contributor
timestamp: December 05, 2021, 02:22:18 pm
content: Maybe you have a hold off time set?

author: listerreg
author_rank: Newbie
timestamp: December 05, 2021, 03:53:22 pm
content: The hold off is at its 8ns default setting.

author: Fungus
author_rank: Super Contributor
timestamp: December 05, 2021, 04:17:46 pm
content: Quote from: listerreg on December 05, 2021, 01:30:42 pmMaybe the time between triggers is very close to the frequency of your signal so it just happens that way. Coincidence.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: December 05, 2021, 04:40:37 pm
content: Zoom in. I'm betting there's a transient, either coincident with DAC update, or possibly other ambient noise (but the latter is likely to be uncorrelated, so the waveform may jump around visibly).Tim

author: newbrain
author_rank: Super Contributor
timestamp: December 05, 2021, 04:51:12 pm
content: Quote from: Fungus on December 05, 2021, 04:17:46 pmI think this is the right explanation, one thing to try is a different setting for the memory depth of the capture - this will affect the time it takes to fill the buffer, and possibly decouple the trigger period from the input signal one.Shorter memory lengths should work better.

author: TurboTom
author_rank: Super Contributor
timestamp: December 06, 2021, 02:15:17 am
content: If your trigger mode is set to "Auto", change it to "Normal". At least on Rigol's older scopes, auto mode won't very well work with slow signals. Maybe it helps on the 5k series as well.

author: listerreg
author_rank: Newbie
timestamp: December 06, 2021, 05:56:05 pm
content: In my signal conditions are met once every +100ms and my buffer holds 50ms worth of samples (500 MSa/s, 25 Mpts).
HP 6652A front panel binding post modification - Page 1
Forum section: electronics / testgear

author: matthuszagh
author_rank: Frequent Contributor
timestamp: December 05, 2021, 08:48:05 pm
content: I have a HP 6652A 0-20V, 0-25A power supply. I was hoping to modify it in a similar way to the HP 6632/3/4A so that it has binding posts on the front panel for the voltage connections (see this thread:https://www.eevblog.com/forum/testgear/hp-6632a-fan-replacement-and-front-panel-posts/). I looked through the manuals for it but couldn't find anything about this being one of the options for the instrument. However, I opened it up and there are pre-drilled holes that look to be made for binding posts. I've attached a picture showing this. The small hole is about 10mm in diameter, and the large holes are about 17mm (since this goes up to 25A, it would probably require beefy binding posts). There's a backing plate behind the front panel (also shown) that seems to allow about 30mm of depth space that a binding post could use.Does anyone know if this device was indeed intended for front panel binding posts as an option? I think another possibility is this front frame was standard for several instruments and some other instrument did support this. Even if not, has anyone modified this device to add those binding posts?I didn't see any connections to the positive and negative voltage near the front terminal, so I would need to route the wires to the rear connections.Anyone know of binding posts that would fit this large 17mm diameter? Also, the part number for the original HP binding posts for this would be great.

author: bob91343
author_rank: Super Contributor
timestamp: December 05, 2021, 10:54:31 pm
content: If those holes are 3/4" apart on centers, it's a standard GR setup. Very popular with stereo gear for the speakers, for instance. I have bunches of them, singly and in pairs.Be careful about routing the output to the front, as the resistance of the wires degrades regulation, unless you can use remote sensing. I did this modification with my Kepco 50 A supply and it works well. I put my binding posts on a small sub panel mounted to the front rack ears. I wired the remote sense leads to it as well.

author: matthuszagh
author_rank: Frequent Contributor
timestamp: December 05, 2021, 11:54:15 pm
content: Quote from: bob91343 on December 05, 2021, 10:54:31 pmIt sounds like I've actually done something similar. I designed a 3D printed part to mount via screws to one of the side panels (pictures attached). I'm moving all of my equipment to be in a 19" rack, and I wasn't sure it would fit, but looks like it can go in, though it's a bit tight. But, I think you're right that it would be good to keep the sense leads near the DUT connection point.
The confusion of Ersa i-con - Page 1
Forum section: electronics / testgear

author: branadic
author_rank: Super Contributor
timestamp: December 05, 2021, 06:40:40 pm
content: Hi,I do have an Ersa i-con 1 and am wondering, if it will work with the chip tool 0450MDJ.The i-con (without 1) obviously can, but what is the difference between i-con and i-con 1? Just a different stand?Can anyone help?-branadic-

author: wraper
author_rank: Unknown
timestamp: December 05, 2021, 06:46:28 pm
content: I-CON1 (not the same as an older I-CON) will not work with the chip tool. You need I-CON, I-CON2, Vario stations, or stations with V suffix. I-CON1 only supports an i-tool soldering iron.

author: branadic
author_rank: Super Contributor
timestamp: December 05, 2021, 07:05:30 pm
content: Okay, that is pretty odd. So i-con 1 works only with i-tool while i-con can handle i-tool, chip tool and x-tool and i-con 1V can handle i-tool, chip tool and x-tool vario? Like why? What is the intention for such a confusion?-branadic-

author: wraper
author_rank: Unknown
timestamp: December 05, 2021, 07:14:57 pm
content: Quote from: branadic on December 05, 2021, 07:05:30 pmProbably because I-CON1 is cheaper than I-CON. Basically they released a cheaper station with the same performance but less versatility. I-CON2 supports all of the tools only on its left port, second port supports i-tool only. i-tool has built in electronics, including temperature sensing, unlike those special tools which appeared way before I-CON was even released.IIRC i-con 1V supports both old special tools and vario tools. Don't count on this though as I'm not 100% sure since researched that years ago.
Anybody fix a Keithley 2000 with ac calibration noticeably off? - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: December 04, 2021, 11:19:33 pm
content: Anybody fix a Keithley 2000 with ac calibration noticeably off?

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: December 04, 2021, 11:45:58 pm
content: Jester,This is probably the best place to go to get the documentation:Link:https://xdevs.com/fix/kei2000/This is TiN's website.The service manual and the schematics are here.Regards,Jay_Diddy_B

author: Jester
author_rank: Frequent Contributor
timestamp: December 05, 2021, 01:04:21 am
content: Jay_Diddy_B,Thanks for the links, I'm sure they will be very helpful.Real quick look at the schematic looks like there are a lot of jelly bean or readily available parts: DG muxes, LM311, LM339, TLE2081, AD637, OPA177, anything LTCan anyone tell me if repair parts are generally easy to come by, are there any or many unobtainable parts: AD705JR?, AD711JR, NE5534, relays, switch, etc?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 05, 2021, 01:39:24 am
content: I think they have an network resistor chip, who's hard to get, and got pricey ??https://www.eevblog.com/forum/repair/keithley-tf-245-replacement-options-(k2000-models)/

author: Kleinstein
author_rank: Super Contributor
timestamp: December 05, 2021, 09:33:55 am
content: Most parts for the Keithley2000 are still available. The custom resistor network is a bit tricky and expensive, but in this case, with DC still working this should not be the problem. The FPGA/CPLD part could be tricky due to the included code.The AC part should not have very hard to get parts, though in these times it could even happen that near yellybean parts (e.g. DG408, MCP6001) at times are hard to get in the right case.For the OPs there is still the option to use substitutes (e.g. for an AD705).
GW-Instek GDS-2000E series circuit diagram - Page 1
Forum section: electronics / testgear

author: Krisztián
author_rank: Contributor
timestamp: December 04, 2021, 09:30:28 pm
content: I'm looking for a GW-Instek GDS-2000E series circuit diagram (input stage is enough for me).For more info please check out that post:https://www.eevblog.com/forum/testgear/gw-instek-gds-2000e-teardown-short-review-comparison-with-rigol-ds2000(a)/msg3853784/#msg3853784Would like to improve DC behavior of my scope. Probably cascoding of input stage BJTs will help.Thanks!
ITECH IT8511A+ - Europe seller - Page 1
Forum section: electronics / testgear

author: candrian
author_rank: Regular Contributor
timestamp: November 29, 2021, 09:20:13 am
content: Hello,After spending several hours reading most of the threads in here regarding the Electronic DC Loads in my budget i'm thinking to finally order ITECH IT8511A+.I was betweenRigol DL3021Maynuo m9811ITECH IT8511A+Now that i have chosen which one i'll finally order i can't find it from a European reseller. Does anybody here has to suggest any online shop for purchasing inside Europe?

author: Kean
author_rank: Unknown
timestamp: November 29, 2021, 10:31:40 am
content: Batronix sell ITECH equipmenthttps://www.batronix.com/shop/load/ITECH-IT8511A+.htmlI'm down under so I've not dealt with them, but others here on the forum seem happy with their service.

author: candrian
author_rank: Regular Contributor
timestamp: November 29, 2021, 10:54:45 am
content: I'm also very satisfied with their service and i have already contacted them but they let me know that they sell iTech only in Germany.

author: Kean
author_rank: Unknown
timestamp: November 29, 2021, 10:57:47 am
content: You don't list your country, so maybe look at potential distributors herehttps://www.itechate.com/en/support/global-service.html

author: 2N3055
author_rank: Super Contributor
timestamp: November 29, 2021, 02:01:01 pm
content: Welectron.comhttps://www.welectron.com/DC-Electronic-LoadsBut, ITECH IT8511A+ is 150W load.Maynuo M9812 is 300W. ITECH IT8512A+ is same as M9812.

author: candrian
author_rank: Regular Contributor
timestamp: November 29, 2021, 02:38:55 pm
content: Sorry i misspelled it. I wanted to write Maynuo M9811

author: mcinque
author_rank: Unknown
timestamp: December 04, 2021, 07:11:50 pm
content: you could try to contact spin electronics in Italy.http://www.spinelectronics.eu/
Fluke 8808A button pressure? - Page 1
Forum section: electronics / testgear

author: ajikacey
author_rank: Newbie
timestamp: December 03, 2021, 05:55:11 pm
content: I have two bench multimeters, the Fluke 8808A and the HP/Agilent 34401A. Currently I *much* prefer the 34401A and it's because the 8808A's buttons take a lot more physical pressure than I expect, meaning I sometimes have to press the buttons multiple times before they register. Is this a common experience with the 8808A or does it sound like I just need to clean the pads?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 03, 2021, 06:35:51 pm
content: maybe you could clean the rubber pads and or pcb pads with ipa, do not use something stronger, it may damadge the pads conductivity ? its like a carbon surfaceIf not try to find some spare pads ??

author: ajikacey
author_rank: Newbie
timestamp: December 03, 2021, 07:42:14 pm
content: Thanks, I'll give that a shot this weekend

author: bdunham7
author_rank: Super Contributor
timestamp: December 03, 2021, 09:50:23 pm
content: Is the problem uniform across the buttons and fairly repeatable? Or is it just some (perhaps many but not all) buttons and is the reaction more random? Is the 8808A in mint condition or is it a bit beat?I don't have any experience with the 8808A specifically, but I've seen a few 8846A models with button issues that turned out to be a physical problem in the circuit board under the FPGA somewhere.
Vintage Kearfott / Ballantine VTVM? - Page 1
Forum section: electronics / testgear

author: deafen
author_rank: Contributor
timestamp: December 03, 2021, 09:11:51 pm
content: Picked this guy up for a song, because it's got that 1kv range (and it looks cool). Dates from 1958 based on the tube date codes. It's branded Kearfott, but I think it's OEM by Ballantine - the meter is branded by them, and it came with a paper schematic for Ballantine 310A. It's not a 310A though, because that one doesn't have a 1kv range. It's also got an unusual miniature 5-pin plug-in rectifier with two 310 diodes in a plastic cylinder - also branded Ballantine.There's an identical one up on eBay, but otherwise I can't find any reference to this device. Kearfott seems to be known for aircraft gauges, not test equipment. It doesn't match with any Ballantine model that I can find.Anybody seen this before? Any tips or links to reference materials? I'm guessing the circuit is identical to the 310A except the range selector. Once I figure out how to expose the innards, I'll have a better idea.(Picture attachments aren't working for some reason, ok try to add them later)

author: bdunham7
author_rank: Super Contributor
timestamp: December 03, 2021, 09:31:06 pm
content: Can you link the one on eBay? I can't find it.How much (or little) does it resemble the 314?

author: deafen
author_rank: Contributor
timestamp: December 03, 2021, 11:08:09 pm
content: Here's the one on eBay:https://www.ebay.com/itm/Vintage-Kearfott-AC-Voltmeter-Vacuum-Tube-Aircraft-Military-/284505717430

author: bdunham7
author_rank: Super Contributor
timestamp: December 04, 2021, 12:24:09 am
content: That looks a lot like a Ballantine 314. You mentioned the custom rectifier thingy--does your unit have this in place of the selenium rectifier in the other photos or is it somewhere else?https://www.radiomuseum.org/r/ballantine_wide_band_electronic_vol.html

author: deafen
author_rank: Contributor
timestamp: December 04, 2021, 03:29:44 am
content: It's definitely the same chassis, but there are a few differences:The 314A has one more tube. Looks like another 5654 maybe? This unit has a capped off BNC connector labeled "AC input" in its place.This unit has an incandescent bulb between the two 0A2 tubes. Could be part of a stabilizing circuit, but could also just be a power indicator - there's no indicator lamp on the front face, and while this would only shine out through the side louvers, I guess that might be better than nothing?The 314A can only do 1kv with a special probe (which I'm assuming is just a 10:1 voltage divider).It's still got the selenium rectifier and the 6X4. On closer examination, it's not a rectifier - the diodes are in series. It's got pins connected to the anode of the first, the junction, and the cathode of the second. The 310A schematic shows that arrangement as part of the meter circuit.The more I look at it, the more I think it might be basically a 310A with an additional divider for the 1kV range. The 310A schematic that came inside it does seem to match up well from early investigation.
Is it possible to use HP 8477A to calibrate HP 438A RF Power Meter ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: December 02, 2021, 01:22:32 pm
content: Hi,I'm wondering if HP 8477A can be used to calibrate HP 438A. I've seen that people use HP 11683A for this, which is very expensive on used market. Are there any other RF calibrators that might be suitable for HP 438A if HP 8477A is not matched for this ?Thanks.

author: 0culus
author_rank: Super Contributor
timestamp: December 03, 2021, 12:15:04 am
content: Quote from: electronic_guy on December 02, 2021, 01:22:32 pmI don't think so, as it's intended for a different type of power meter that uses a thermistor mount. That said, I wouldn't adjust your 438A unless the power ref is obviously way off. I have three 438As, two in service and one for parts. The power refs on the former two are bang on correct according to multiple methods of measurement, so I did not touch them. I do have both the 11683 and the 8477 calibrator boxes though, the latter for my 432A.
First generation LeCroy WavePro CPU choice - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: December 03, 2021, 01:14:54 am
content: In a 2001 LeCroy catalog, I noted that the WavePro 960 uses the PowerPC 603 but it did not offer the more powerful (and relatively new) G4 (7400 series) or even the G3 (700 series).Such an offering would have been good at the time considering that the first generation WavePro can handle FFTs up to 25 million points and would have greatly improved calculation speed with a G3 and even more with a G4.
Agilent E5071C not booting. - Page 1
Forum section: electronics / testgear

author: simba15
author_rank: Regular Contributor
timestamp: November 26, 2021, 02:54:03 am
content: So a coworker and I went to try and fix one of the labs E5071C Network Analyzer( was beeping while in operation)We removed the case (quite a lot of screws.) and tried to power it up to inspect the fan operation.It didn't post. ( yikes!!) We re installed the cover to see if there was an intrusion switch or the like but it still didn't post.We tried an external display, no luck! ( we're sweating now!)We checked all the internal leds. The only ones red were one labeled "Thlimit" and the hdd acct (i think) led.Unfortunately the service manual lists nothing like this and suggest to replace the mother board.( ekk)Anyone worked on these or had any similar issues?Tia.The ev

author: DaJMasta
author_rank: Super Contributor
timestamp: November 26, 2021, 04:37:45 am
content: As they are basically PCs connected to network analyzer hardware, it sounds like your fault is probably in the PC portion.I would be worth checking motherboard voltages (probably all through a standard ATX power connector) and trying to boot the system with minimal hardware (for example, disconnecting the interface card to the measurement part of the analyzer) to see if there are signs of life. If you get the model number for the motherboard (probably a commercially available industrial board), you may be able to find a manual that lists beep or LED diagnostic codes.That will give you somewhere to start, but it could be a lot of things until you can narrow it down or find other symptoms.

author: simba15
author_rank: Regular Contributor
timestamp: December 02, 2021, 04:04:12 pm
content: Thanks,Turns out there is a bit of a different setup due to the 2 position power switch on the device.There is also another power switch internally. If there is no post then you need to open the device and press and hold this to reset the power state.
Is Agilent/HP E3632A good power supply for a beginner in electronics ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: November 25, 2021, 03:30:08 pm
content: Hi,My main focus would be to try to learn the basics first, like prototyping PCBs, OPAMPs etc and go complex in to RF circuits.Would an Agilent/HP E3632A a good solution for this ?Or should I go with a multiple output unit like Agilent/HP E3631A ?Thank you.

author: Grandchuck
author_rank: Super Contributor
timestamp: November 25, 2021, 03:52:14 pm
content: For op-amps, a dual tracking supply is desirable.

author: pqass
author_rank: Super Contributor
timestamp: November 25, 2021, 05:10:53 pm
content: A simple variable linear bipolar supply, say ±20V@1A, is good enough for opamps and oscillators.You can learn a lot by making your own first.https://sound-au.com/articles/power-supplies2.htmhttps://sound-au.com/articles/bench-supply.htm

author: J-R
author_rank: Super Contributor
timestamp: November 25, 2021, 11:43:45 pm
content: If you're looking for HP/Agilent/Keysight, have a look at some of these:https://www.ebay.com/itm/194385942444https://www.ebay.com/itm/174821143726https://www.ebay.com/itm/175034694415orhttps://www.ebay.com/itm/124768872056

author: electronic_guy
author_rank: Regular Contributor
timestamp: December 02, 2021, 01:24:00 pm
content: Thank you all for the replies on this matter.
Anyone on here have the ET43x LCR meter from EastTester? - Page 1
Forum section: electronics / testgear

author: killingtime
author_rank: Regular Contributor
timestamp: August 18, 2021, 07:45:21 pm
content: Hi,I borrowed a DE5000 LCR meter over the weekend. I liked it but one niggle was the lack of last function memory at turn on. If you want to see cap esr there's a few button presses involved - at every turn on. Not the worlds biggest deal breaker. The meter is good value for money.I wondered if the ET430/1/2 from EastTester has function memory or not. I'll be using it for cap and esr measurements most of the time. Would be nice if it remembered the last function used. Colour screen meaning short battery life if left on, so frequent turn offs will be a thing.The manual shows a turn on setting in the system menu but doesn't explain how it's used.If you have this meter could you take a look?Thanks.

author: killingtime
author_rank: Regular Contributor
timestamp: November 14, 2021, 08:52:03 pm
content: Well, my ET432 LCR meter arrived.To answer my own question, the meter does remember the last used setting, which is nice. You have to go into the setup menu and select remember last used, so the unit functions this way. It remembers the primary and secondary measurement selections.Regards.

author: tridentsx
author_rank: Regular Contributor
timestamp: December 02, 2021, 12:21:50 am
content: Are you happy with the meter ?
Tek TDS 3000 series Floppy drive USB upgrade? - Page 1
Forum section: electronics / testgear

author: Tracker
author_rank: Regular Contributor
timestamp: December 03, 2021, 08:22:18 pm
content: Hello forum,Looking for any tips on swapping the 3.5" floppy drive on my TDS3000 series scope for a USB port ?Thankstracker

author: Kean
author_rank: Unknown
timestamp: December 04, 2021, 03:27:10 pm
content: Maybe a Gotek? No ideal if it will be compatible but they work in a lot of devices.http://www.gotekemulator.com/- they can be found on eBay and Amazon, etc.For more info seehttps://github.com/keirf/FlashFloppy/wikiwith details on suggested models to buy or avoid, better firmware, and other mods.

author: Tracker
author_rank: Regular Contributor
timestamp: December 04, 2021, 04:37:34 pm
content: Thanks Kean,Meanwhile I also managed to find some interesting links:https://viewinghood.wordpress.com/2016/03/11/tek-tds-mit-gotek-floppy-emulator-oder-35floppy-teac-fd-serie/https://github.com/keirf/FlashFloppy/issues/155It definitely can be done, a nice project me.Cheers

author: Kean
author_rank: Unknown
timestamp: December 06, 2021, 07:20:26 am
content: Haha, not a surprise it has been done before.
Takeda Riken TR-3788C - Page 1
Forum section: electronics / testgear

author: CASKP
author_rank: Newbie
timestamp: December 01, 2021, 01:19:21 pm
content: HelloThis is my first post here on the forum.I thought I would share with you my find - the Takeda Riken Frequency Meter . The device arrived to me damaged. Only the Nixie lights were on - but the meter was not making any measurement.I managed to repair it.Link to the video about the meter :

author: rvalente
author_rank: Frequent Contributor
timestamp: December 01, 2021, 02:45:04 pm
content: Cool! I really like the effect of it "counting" instead of just displaying the updated value as usually is done. I'm sure they've saved a latch by doing so.

author: CASKP
author_rank: Newbie
timestamp: December 01, 2021, 04:39:35 pm
content: When I saw him - I fell in love with him. Brilliant design. I had to run it. This device deserved further life. Today I will take more photos of how it is made.
iTech IT7321 / BK9801 software control - Page 1
Forum section: electronics / testgear

author: blubillcanada
author_rank: Contributor
timestamp: December 06, 2021, 02:04:19 pm
content: I have an iTech IT7321 but can't seem to get the BK9801 software to see it (assuming they're the same device).I've tried both Ethernet and RS232. Do I need to install National Instrument's VISA software? Do I need to locate iTechs version of the software albeit I haven't found it for download anywhere?

author: Kean
author_rank: Unknown
timestamp: December 06, 2021, 02:28:58 pm
content: The software download is called IT9000-PV7300 and integrates with their other IT9000 apps, like IT9000-PV8500 for the IT8511+ DC load.I have copies of these dated 2017 downloaded from the itech.sh website. PM if you want a copy. You don't need to install VISA for it.To be honest it isn't very good, only useable for simple tasks. Depending on your needs, you are probably better off controlling it via SCPI.Maybe a definition can be created for it with HKJ's Test Controllerhttps://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

author: blubillcanada
author_rank: Contributor
timestamp: December 06, 2021, 06:51:33 pm
content: Great, I would appreciate any software you have. I made an account on iTech but only found documentation and the NI driver (no executable)The BK9801 software seems to see the USB NI driver but does not communicate.

author: Kean
author_rank: Unknown
timestamp: December 08, 2021, 08:10:30 am
content: PM sent
HP E4433B Failed Battery Repair  - Page 1
Forum section: electronics / testgear

author: weekendEE
author_rank: Newbie
timestamp: November 30, 2021, 10:21:11 pm
content: Recently I purchased an 'as is' HP E4433B, when I received it I could immediately hear a soft rattle coming from inside the instrument. When powered on there is no RF output at all and when the output amplitude is changed there is no audible attenuator clicking. Upon checking the logs there are 30 "error 230 data corrupt or stale" messages, most of which having to do with RAM. Once I saw this I immediately figured the internal battery was shot and the memory had been erased.Once I cracked the instrument open the first thing I noticed was that one of the internal batteries tabs had broken loose. I am going to have to order a new battery as this one is completely dead. Everything else looked great, all of the power status indicator lights on the main board were on and the binary counter was functioning.My question is how should I proceed after replacing the battery, I would assume a fresh install of the firmware would be a start. Any advice on how to proceed would be appreciated.

author: MarkL
author_rank: Unknown
timestamp: December 01, 2021, 01:14:51 am
content: The E4400 Series Service Guide is here:http://literature.cdn.keysight.com/litweb/pdf/E4400-90335.pdfAccording to the Service Guide (page 5-24):QuoteSo, unless you had user waveforms, sequences, setups, etc. that you wanted on the unit, you should be fine.Your firmware should also still be intact with a dead battery. Service software is available if you want to upgrade your firmware, or if you really need to reload the firmware for some reason.Replace the battery, and go from there. With any luck there's not something else wrong with the unit.Or, if you haven't messed with the unit yet and you purchased it as working (on ebay, "Condition: Used"), you might consider returning it. The RF section can be difficult to repair, and there's no schematics or detailed service information generally available. If the seller is facing a return, they will probably not have a problem if you want to at least try a new battery and still accept a return if the issue was not the battery. But I would ask and get this agreement before digging in.

author: DeepLink
author_rank: Regular Contributor
timestamp: December 01, 2021, 06:10:09 am
content: CLIP for Agilent ESG is indeed available - got a scan for a reasonable price from Milan Vasic (PM me for his adress)For repair of the RF boards an extender board is handy
Applications for the Tektronix SI5010 Scanner / Switch - Page 1
Forum section: electronics / testgear

author: bnordlund
author_rank: Newbie
timestamp: December 02, 2021, 05:21:19 am
content: This post is meant to prompt some brain storming, relating to the Tek SI5010 GPIB switch module (used in a TM5000 series power supply chassis).Simply put, it has 16 BNC's that can be switched to (or from) 4 BNC's in various combinations. I picked up a couple of these units and have the GPIB control all working.I originally thought these would be a great way to connect multiple points to a single DMM, allowing long term logging of several measurement points with my bench meter (much more cost effective than an HP 3457A with a switch module). That use was enough for me to justify the $10 expense for the two modules.Reading the documentation, it's apparent that this is such a generic device, that they don't seem to even describe any specific applications. As a result, I am already thinking of other uses that might be even more fun than the DMM scanner concept.For those unfamiliar, each BNC has a 50 ohm relay on it. One way to use it as four groups of five BNC's, with each being able to switch any number of the group of four signals to the fifth BNC. With that being the shortest signal path, the RF bandwidth for that mode is 350 MHz. Other modes can be used, all the way up to being able to switch any of 16 BNC's to one (reducing the bandwidth to 70 MHz). With high impedance loads, it can switch up to 15V, and at 50 Ohms it can switch 2.73V. Switched current capacity is only 10mA, but can carry 250mA in the closed state. Switching time is 3mSec (open or close).Has anyone used these for any unique applications? So far, I have come up with the following:1. Measuring of multiple points with a single-input DMM, as described.2. I don't have a GPIB-controlled attenuator, but I do have several fixed attenuators. With the switch module, I can come in on the common BNC of group #1, switch to one of the legs of that group, go through an attenuator to a leg on the second group, then come out the common BNC of group #2.3. I don't have a GPIB-controlled low distortion signal generator, so my thought is to build several single-frequency low-distortion oscillators, and be able to switch them individually to automate a multi-frequency audio distortion analysis (I do have a programmable distortion analyzer for that end of the process).What are some other possible uses?Thanks,Brian.
Differences between Rigol RSA3000 and RSA5000? - Page 1
Forum section: electronics / testgear

author: eblake
author_rank: Newbie
timestamp: November 30, 2021, 06:01:56 am
content: I've had no luck googling variations of this query, or finding information here, but I'm curious if anyone knows of differences between these units other than...The differences I've found are that the carrier offsets and DANL figures are a few dB better on the RSA5000, and the RSA3000 does not seem to offer the Vector Signal Analysis option (VSA).There's a fair jump in price between the two series, so I wonder if the above explains it all, or if I've missed something significant. Maybe it's the colour differenceComments would be appreciated.

author: 2N3055
author_rank: Super Contributor
timestamp: November 30, 2021, 08:45:40 am
content: Just put two datasheets together.There are many differences. Bandwidth, DANL, phase noise, VSA...

author: eblake
author_rank: Newbie
timestamp: November 30, 2021, 03:43:09 pm
content: QuoteCombing through the 28 pages of each datasheet is exactly what I did, highlighter in hand.Perhaps I'm making incorrect evaluations about the cost of the tighter specifications, but that's what I was asking about.

author: 2N3055
author_rank: Super Contributor
timestamp: November 30, 2021, 04:04:54 pm
content: Quote from: eblake on November 30, 2021, 03:43:09 pmSo making a 6 GHz front end with better DNL and noise than the 3GHz one is not a big deal.. That alone is enough to warrant price difference (and some). Real time VSA software option alone from some other manufacturers costs more than whole RSA5000..So, yes, you are underestimating what an upgrade it is..
Negative capacitance on HP4194A lcr meter - Page 1
Forum section: electronics / testgear

author: iheb
author_rank: Newbie
timestamp: December 01, 2021, 02:42:58 pm
content: I am trying to measure a photodetector's internal Series and parallel capacitance using HP 4194A, however i am encountering this issue that the capacitance is negative ?can anyone help and explain what am i doing wrong or what can i do to get the right capacitance and series resistance.thank you

author: RolandK
author_rank: Regular Contributor
timestamp: December 01, 2021, 03:30:02 pm
content: negative capacitance means an inductive behaviour. So yourXc = 1 / (2 * Pi * f * C)As Xc is negative:XL = 2 * Pi * f * Lwith XL = -Xc you getL = - 1 / (2 * Pi * f)^2 / fIf you reduce your measurement-frequency, the Xc increases and the XL decreases.You have both at the same time, but you only see the difference on the instrument.

author: RolandK
author_rank: Regular Contributor
timestamp: December 01, 2021, 03:46:13 pm
content: The other point is, you should calibrate the 4194A four your individual probe adapter. If you don't know how, read the f... manual.Or: Measure the capacitance of your setup with removed photodiode (which should be more negative) and with photodiode and calculate the difference.For measuring the diode you should know your required bias and explore how to apply it: you must decoupple the power supply for the used frequency (use incutors and or high resistors) and you must protect your instrument from the powersupply (use capacitors) Theare is a difference in capacitance depending on the actual voltage (vorward, none, reverse).A nice introduction is keysight's impedance measurement handbook. You should know what to do before killing your instrument.
Sprung Hook banana adapter - Page 1
Forum section: electronics / testgear

author: Trader
author_rank: Frequent Contributor
timestamp: November 29, 2021, 03:50:28 am
content: Please, where can I find these adapters?I don't know the right name. I appreciate a link to a cheap one (AliExpress, eBay, Amazon, etc). Thanks

author: bdunham7
author_rank: Super Contributor
timestamp: November 29, 2021, 03:54:32 am
content: Sprung Hook. Probemaster. Very reasonable for the 1000V version, more for the 7kV model.https://probemaster.com/9169-sprung-hook-probe/https://probemaster.com/4219-high-voltage-sprung-hook/
Does anyone know the value of C61 in an  OWON HDS2061M-n and want to tell me? - Page 1
Forum section: electronics / testgear

author: xugmu
author_rank: Contributor
timestamp: November 30, 2021, 03:31:11 pm
content: Playing with a flyback transformer I have damaged the input of my hds-2061m-n, specifically C61.It is a white 3216 (mm) SMD capacitor right next to the input relaySomeone could tell me the value?Best regards
Rigol DL3021 - Battery test flaw? - Page 1
Forum section: electronics / testgear

author: BellaminoBoy
author_rank: Newbie
timestamp: October 11, 2021, 07:26:45 am
content: Hello,i use my DL3021 only for battery and charger testing. Since the unit has no CP only CC in battery test i usually increase current as battery voltage goes down to make the test faster.What i noticed is really strange. If the test is in progress, and you try to change current there is no over power protection. For example now im discharging a 60 V battery with 3 A, and i could easily increase current to achieve over 300 W and more. Is this a bug in the firmware that allows to set the unit over the maximall allowed 200 W rating? I did try to discharge battery on 350 W for 15 seconds, and it worked, the display showed 350 W. I did not want to test longer, not to release magic smokeHope you understand me, not a native English speaker.

author: BellaminoBoy
author_rank: Newbie
timestamp: October 19, 2021, 02:39:39 pm
content: I was asked by Rigol to provide a picture of this finding. I have also verified current with meter in series with the battery. In battery test mode the load does not care about total power. You can set 150 V 40A, 6000 WHere are pictures, 280-300 W at the moment. I have tried 500 W shortly, it proves the bug in firmware. I did not want to test much, dont want to destroy my instrument

author: electr_peter
author_rank: Unknown
timestamp: November 25, 2021, 12:47:00 pm
content: Thanks for the info. I will try to confirm this on DL3000. Do you have latest FW on RIGOL? I guess temperature protection should kick in before it blows up, but that is potentialy serious issue.Battery app on DL3000 has some bugs, one is mentioned hererigol-dl3021a-current-failing-to-load-consistently-in-battery-modeThis bug has been reported to Rigol, hopefully they will update FW. Can you check this issue on your unit?

author: electr_peter
author_rank: Unknown
timestamp: November 28, 2021, 07:39:11 pm
content: Constant power mode (CP) limits max available power to 200W as it should. In other modes, including battery app mode, power limit does not seem to be enforced correctly. OP mentioned280W case in CC mode
Hacking the FFT curve color on a GW Instek GDS-1054B - Page 1
Forum section: electronics / testgear

author: ingvarai
author_rank: Newbie
timestamp: November 28, 2021, 11:35:34 pm
content: Hi,I have a GW Instek GDS-1054B.All is fine, I like the oscilloscope. With one major exception. The color used for the Math (FFT) curves is a dim dark red color. Almost impossible to see. Is there a way to hack the scope, just to change this color? A white color would be just fine.I haven't found any way to change the color using the normal user interface.If I select Alternate On, the curve's visibility is OK, but having Alternate On during Math will not work.I am a beginner here, maybe I have misunderstood. Any help and comments are welcome!Please see the two attached screen shots, one with Alternate On, on with Alternate Off.[ Specified attachment is not available ]-Ingvar

author: nctnico
author_rank: Super Contributor
timestamp: November 29, 2021, 01:29:50 am
content: Did you try to adjust the trace brightness / intensity? That likely will help.

author: ingvarai
author_rank: Newbie
timestamp: November 29, 2021, 01:50:00 am
content: Yes. I tried from 60% to 100%. But it doesn't really make much difference.If anyone else has a GW Instek 1000B series scope, I would be interested to hear their opinion.I cannot really understand why they (the manufacturer) made it this way. Because all Math functions are practically not usable, because there practically is nothing to see on the screen!Check the images I attached in the start post in this thread!-Ingvar

author: PeterKlop
author_rank: Contributor
timestamp: November 30, 2021, 12:13:52 am
content: Looks like to limited memory. Try increasing the 10k points?

author: ingvarai
author_rank: Newbie
timestamp: November 30, 2021, 04:26:50 am
content: Hi PeterKlop,this did the trick! Thanks a lot!I am rather new to modern oscilloscopes, and was not aware of this.Now it works fine, and especially for the Math function which is to most interest to me.Again - thanks!-Ingvar
How did I do at the garage sale? - Page 1
Forum section: electronics / testgear

author: Rx7man
author_rank: Regular Contributor
timestamp: November 26, 2021, 10:15:04 pm
content: I already have a few pieces of test equipment, but well, you never have too much (or enough)Techtronix TAS475 scope (CRT, 4ch 100mhz)Fluke 8840A DMM (5 1/2 digit, 2/4 wire resistance testing)Intek DM8034 DMM, 1000V, 20A, resistance, capacitance, diode, continuity, 4 1/2 digit)Tenma 72-630 power supply (15V 30A peak)$350 CAD (about $275 USD) for everythingI have a little Keysight 2 channel scope, but once in a while 4 channel is nice, The Techtronix scope came out right about when I went to university, I think there's a chance I used that very scope in the lab..A couple benchtop DMM's are always handy and probably more accurate than most of my handheld chinesium ones
Keysight DSOX1204A questions - Page 1
Forum section: electronics / testgear

author: SReifel
author_rank: Newbie
timestamp: November 26, 2021, 06:43:33 pm
content: I'm looking to replace my old Tektronics scope and want something with equal fit-and-finish. I'm considering a Keysight DSOX1204A. Am I correct in assuming that a black Keysight will be a bit higher quality than the Siglent SDS1104X-E or SDS2104X+. I understand the difference in their specs, but what about comparing reliability, longevity, feel of the buttons/knobs, UI, bugs, ...Also I hate fan noise. Will the keysight be quieter than a Siglent?Thx!
Schematic for early HP 202a? - Page 1
Forum section: electronics / testgear

author: deafen
author_rank: Contributor
timestamp: November 25, 2021, 07:40:59 pm
content: I just picked up an early HP 202a function generator (mid 1957, based on component dates). The only manual/schematic available online starts at serial number 5612, but mine is in the upper 3000s. The most obvious difference is that the manual shows 12 silicon diodes in the sine shaping circuit, whereas my unit uses six 6AL5 tubes. Unlike other vintage HP manuals, there's no list of changes from older revisions. While obviously the diode difference isn't a huge deal, it does make me wonder what other circuit changes there might have been.I know it's a long shot, but does anyone have access to an older schematic or manual?
How to find a fuse for Agilent E3632A ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: December 01, 2021, 01:36:50 am
content: Hi,Agilent manual says I can replace the fuse with agilent part number 2110-0999 for 2.5 AT fuse for 230V operation. But I cannot find a place to buy it. Can I replace it with a third party fuse. How to find this fuse from Arrow or Mouser ?Thanks.

author: gslick
author_rank: Frequent Contributor
timestamp: December 01, 2021, 05:40:01 am
content: Quote from: electronic_guy on December 01, 2021, 01:36:50 amhttps://www.keysight.com/my/partDetail/2110-0999Part Number: 2110-0999Part Description: Fuse 2.5A 250V Time-Delay 0.0255-Ohm 20X5.2-mm CartridgeSeems like one possible match for those specs might be something like a Bussmann / Eaton BK/GDC-2.5A in stock at Mouser / Arrow / Newark etc.

author: tooki
author_rank: Super Contributor
timestamp: December 01, 2021, 12:42:52 pm
content: So it’s a bog-standard slow-blow 5x20mm fuse. Available from any electronics supplier.
Clever  hack to get UVC video stream from scope screen - Page 1
Forum section: electronics / testgear

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: November 24, 2021, 08:01:22 pm
content: Neat hack using Cypress FX3 UVC camera firmware to stream video from a scope LCD screen to USBhttps://youtu.be/sM5IHYPGXds
Comark - Page 1
Forum section: electronics / testgear

author: Ashuraya
author_rank: Newbie
timestamp: November 29, 2021, 12:13:44 am
content: Hi,I bought this Comark 1624-4 thermometer without the probes (T type) for 10 Aussie dollars. it seems a precision lab grade thermometer, and it turns on and meter has smooth movement, even though there was battery corrosion which i dealt with.I wonder if anyone can help me in finding service manual, schematics or calibration manual if available for this toolyour help is much appreciated