hybridfree/eevblog-posts huggingface dataset:
Tektronix P6201 & 1101(A) - Page 1
Forum section: electronics / testgear

author: Antonio90
author_rank: Frequent Contributor
timestamp: March 12, 2024, 12:36:31 pm
content: Hello,I have a Tektronix P6201 active FET probe, but haven't been able to find a reasonably priced matching PSU.Googling around a bit, I found a post stating that the pinout on one of the manuals had the +15 and -15V pins swapped around.Could someone with the PSU (or having made a substitute) confirm the pinout on the attached doc is correct?

author: Antonio90
author_rank: Frequent Contributor
timestamp: March 12, 2024, 03:10:45 pm
content: It was correct.Just in case someone searchs for this same question. The red wire is +15V, the white one, -15, and the black wire, along with the shielding is ground (common with scope inputs)
Hissing crackling noise from my Siglent SDM3035 - Page 1
Forum section: electronics / testgear

author: roboman
author_rank: Newbie
timestamp: March 08, 2024, 11:43:49 pm
content: Hello Guys,I just got my brand new SDM3055 delivered, I was so excited I set it up and hooked to my SIGLENT SPD3303X-E and started taking some DC voltage measurements.I swear sometimes I hear a hissing, sometimes a crackling noise (like sparks) coming from the multimeter, mostly subdued by the fan noise. It is not consistent, happens occasionally.Is it something I need to be worried about?I am brand new to a bench multimeter, so do not know what to expect.Thanks for your answer.

author: DimitriP
author_rank: Super Contributor
timestamp: March 08, 2024, 11:59:58 pm
content: Sparking and/or hissing sounds spell RMA

author: roboman
author_rank: Newbie
timestamp: March 09, 2024, 12:30:43 am
content: How can be sure? The fan noise is overwhelming.

author: KungFuJosh
author_rank: Super Contributor
timestamp: March 09, 2024, 02:34:29 am
content: Quote from: roboman on March 09, 2024, 12:30:43 amI have an SDM3055, and while the fan is loud, I've never heard ANYTHING besides the fan and relays clicking coming from the DMM.If you confirm the noise is actually from the DMM, have it replaced.

author: Veteran68
author_rank: Frequent Contributor
timestamp: March 09, 2024, 04:44:16 am
content: Are you sure that what you're hearing isn't the relays clicking?

author: tautech
author_rank: Super Contributor
timestamp: March 09, 2024, 04:49:26 am
content: Quote from: roboman on March 08, 2024, 11:43:49 pmCheck the fan for some foreign matter on/near the grille making intermittent contact with the blades.Remove with tweezers if/as necessary.

author: roboman
author_rank: Newbie
timestamp: March 09, 2024, 03:32:26 pm
content: I hear the relays clicking too, it is clear when I transition to a higher voltage input. Interestingly, the crackling noise is no longer frequent. The meter is just one day old. Let me keep it under observation or put a recording device next to it.

author: 2N3055
author_rank: Super Contributor
timestamp: March 09, 2024, 04:13:29 pm
content: Try different power cable.
A real toy scope (DIY kit) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: March 09, 2024, 12:38:09 am
content: Bottom of the barrel. Can be had from aliexpress for less than $10.Specs are a bit lacking:- Product model: TJ-56-646- PCB size: 57*34mm- Working voltage: 4-5V- MCU: STC8A8K64S4A12- Display: 0.96 inch OLED display – 7P, 128*64 resolution- Number of channels: single channel- Sec/div: 500ms, 200ms, 100ms, 50ms, 20ms, 10ms, 5ms, 2ms, 1ms, 500us, 200us, 100us (100us is only available in auto trigger mode)- Voltage range: 0-30V- Sampling level: 10kHz@100us/div- Trigger level: trigger voltage level.- Trigger slope: ↑-rising edge, ↓-falling edge trigger- Trigger mode: A-automatic mode, N-normal mode, S-single mode.According to the datasheet: "The speed of ADC can be up to 800Ks."A bit more info here:https://zeusdiy.com/product/tj-56-646-mini-dos-lcd-oscilloscope-diy-kit/https://en.56dz.com/p/23.html

author: Aldo22
author_rank: Super Contributor
timestamp: March 09, 2024, 10:10:35 am
content: What is the purpose of thisproduct?An SMD soldering exercise?To solder a 44-pin SMD chip, you need to have the equipment and the skills. Perhaps a little ambitious for children.If all goes well, you get the worst scope ever?ADSO154Prois a Rolls Royce compared to this and doesn't cost much more.There are things for which $1 is still too much.Am I missing something?
DPO3034 - Connecting to a PC via USB - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: March 09, 2024, 01:06:29 am
content: Hey All,I dumpster-dived a DPO3034 marked "Does not communicate with the PC". It seems to run fine standalone and if I connect the Ethernet port then I can see it as a GPIB device and it reacts to IDN.However, when I plug the USB host into my PC, I see an error - The dreaded Code 43 - A request for the USB device descriptor failed.Now this isn't a problem for me per see as I have a bench LAN and mostly use the NI-VISA software on my PC but I'm wondering if I'm doing or missing anything when connecting it - I don't think so as it is supposed to be a USBTMC instrument and the NV-VISA software should provide a driver for that but I thought I'd check.Thoughts?TonyG

author: coromonadalix
author_rank: Super Contributor
timestamp: March 09, 2024, 02:22:48 am
content: you wont miss a thing to me, if your lan port is okayusb is not for very intensive data polling .... i use lan on my stuffcode 43 could mean HW failures, not sure its driver related, check in device manager for the vid pid error and try to find if you need driversfor visa related i se Rohde schwartz drivers, lightweight and practical, you have tools to communicate with instruments, had bench dmm with usbtmc, and worked very well

author: Tony_G
author_rank: Super Contributor
timestamp: March 09, 2024, 02:57:35 am
content: Thanks - I generally use GPIB via a NI GPIB-ENET/1000 or simply LAN as you say, so while a number of my instruments do have USB I've never used it.I think I'm going to just ignore it for now.TonyG
Uni T 219DS opinions - Page 1
Forum section: electronics / testgear

author: bchannell
author_rank: Newbie
timestamp: March 08, 2024, 09:26:42 pm
content: As an HVAC business owner and technician, I like to carry only one meter that will do everything I need to do. It is difficult to find a good one but not impossible. I was looking at what is available and found that the Uni T 219DS has everything I could ever want in a meter. My question is, and I know there's a lot of bashing Uni T, but there is also some love for certain Uni T meters. What is the groups opinion of the 219DS?
Constant Current Sink Recommendation - Page 1
Forum section: electronics / testgear

author: lukegalea16
author_rank: Newbie
timestamp: March 08, 2024, 09:53:15 am
content: Hi,I'm looking for a constant current sink (ideally something off the shelf) to test my 3.6V battery under 2A-4A (2A is more realistic) loads for approx. 4 hours.Initially I was going for a power resistor but the current would change with decrease in voltage.Can anyone recommend some lab test equipment please?

author: BennoG
author_rank: Frequent Contributor
timestamp: March 08, 2024, 10:14:32 am
content: I have a ET5410, I had mine for $175.And for this kind of jobs it is ideal because it has a discharge option, so it won't over discharge your battery.Benno

author: lukegalea16
author_rank: Newbie
timestamp: March 08, 2024, 04:55:45 pm
content: Looks very similar to what I have in mind. Where did you buy yours please?

author: BennoG
author_rank: Frequent Contributor
timestamp: March 08, 2024, 07:03:08 pm
content: Aliexpresshttps://nl.aliexpress.com/item/1005004279482251.htmlI have de 150V 40A version.I had the below one for some timehttps://nl.aliexpress.com/item/1005005210461952.htmlBut it was always in the way because of no good housing. So gave mine away an bought the ETS5410Benno
N7800A Test Management Environment - Page 1
Forum section: electronics / testgear

author: nexus
author_rank: Regular Contributor
timestamp: April 16, 2022, 12:58:26 am
content: Hi all,Does anyone have experience using the N7800A test management environment from keysight? I'd like to use it to diagnose and test old instruments, but apparently you need some expensive licenses to use it. Has anyone adapted it for hobby use?

author: lia54
author_rank: Newbie
timestamp: March 14, 2024, 05:55:12 am
content: Me too
Removing the front panel of a Siglent SSA3021X  - Page 1
Forum section: electronics / testgear

author: amaschas
author_rank: Regular Contributor
timestamp: March 08, 2024, 04:27:07 am
content: I've recently acquired a Siglent SSA3021X that seems to have a problem with the control knob rotary encoder. I'm trying to remove the plastic front panel to examine what's going on, but I can't seem to get it off and I'm afraid of using force and breaking it. I've followed the process in the service manual, removed the back panel and all of the screws holding the front panel to the back, but something appears to still be holding it on. Is there a trick to doing this?

author: tautech
author_rank: Super Contributor
timestamp: March 08, 2024, 07:51:36 am
content: P35 see top image.https://int.siglent.com/u_file/document/SSA3000X_ServiceManual_E01B.pdfThere seems to be a screw under the decal next to the TG port.

author: amaschas
author_rank: Regular Contributor
timestamp: March 08, 2024, 03:53:21 pm
content: Oh my god that was totally it. I would never have found that for the life of me, thank you! I can't believe that with all the work Siglent put into this thing to make it easy to take apart, they would hide a screw under a decal like that.
Wavetek 395   service manual ? - Page 1
Forum section: electronics / testgear

author: mr ed
author_rank: Regular Contributor
timestamp: March 08, 2024, 01:14:52 pm
content: Looking for service info for a Wavetek 395 everywhere and no joy. They became Fluke or Datron or maybe TTi in The UK.Any leads are appreciated. (P.s. the user manual is available).
Tektronix Obsolete 012-xxxx-xx Cables - Page 1
Forum section: electronics / testgear

author: calibrationfixture
author_rank: Regular Contributor
timestamp: March 08, 2024, 07:29:47 am
content: Hi,Just spotted on eBay:https://www.ebay.com/itm/126366535707A BSM-Cable and two 012-0532-00 (SMB-Fem to BNC-Male) The last are normally much too pricey on eBay.Calibrationfixture
KORAD KA3305P calibration procedure request - Page 1
Forum section: electronics / testgear

author: derek1985
author_rank: Newbie
timestamp: October 01, 2023, 12:56:36 pm
content: Hi,I recently bought KORAD KA3305P power supply. The ammeter for channel 1 is off by ca. 0.001 A. If anybody is in possession of calibration procedure for this unit and could post it here I'd highly appreciate it. (Tried to contact Korad directly but haven't got a reply for two weeks now.)Cheers.

author: BriBri
author_rank: Newbie
timestamp: March 08, 2024, 05:50:52 am
content: I found this but I haven't tried it yet.https://blog.sra-solder.com/knowledge-base/calibrating-the-korad-ka3305p-d-using-the-kel103
Has anyone run eTracer valve tester software on the macOS? - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: March 08, 2024, 04:41:55 pm
content: Like the look of the tester, but as a Mac-only environment, has anyone made this work?

author: KungFuJosh
author_rank: Super Contributor
timestamp: March 08, 2024, 05:53:00 pm
content: I use an FUtracer, that uses the utMax software that has options for Windows and Linux. It's open source software built in Qt, so it could be ported to Mac if that's something you need. I think somebody might be working on that, but I don't know.
Simpson Model 229-2, AC Leakage Current Tester - Page 1
Forum section: electronics / testgear

author: sfeinsmith
author_rank: Newbie
timestamp: March 03, 2024, 12:26:43 am
content: Today, I acquired the Simpson Model 229-2 AC Leakage Current Tester from eBay. It appeared in excellent condition. I downloaded a manual from Simpson Electric. Unfortunately, the manual was lousy and did not clearly explain how to use the tester. I checked YouTube and found a lousy presentation with a lack of English language.I reviewed some video clips, which did not help me understand how to use the AC leakage current tester because there were no demos or diagrams.Perhaps you may have the same instrument, and I would appreciate it if you could explain it to me as clearly as possible. It will be great to use YouTube to show how to hook up with the instrument to ensure no AC leakage.Thank you very much,Steven

author: bdunham7
author_rank: Super Contributor
timestamp: March 03, 2024, 12:45:22 am
content: The manual seems straightforward to me. Is it this one?https://res.cloudinary.com/iwh/image/upload/q_auto,g_center/assets/1/26/Simpson_229-2_Manual.pdfThe device is simply a specialized AC-only meter that measures voltage and small currents according to a specific standard. You can measure power line voltage with the 150 or 300VAC ranges and then you can measure leakage using the current ranges. To measure leakage of an appliance, you would put one probe to a good ground point and the other to the metal frame of the appliance. You typically have to break the regular ground connection when you do this measurement using a 'cheater' plug or something similar. You can measure the leakage directly between the mains ground and the disconnected appliance ground lead as well.

author: sfeinsmith
author_rank: Newbie
timestamp: March 04, 2024, 06:13:07 am
content: Yes, I have a manual for my instrument. I have understood the AC voltage ranges (150/300). I also understood the probe-to-the-ground situation for leakage. However, I was unsure about the short test and current ranges (0.3, 1, 3, and 10 mA). It would have been helpful if there were diagrams to demonstrate the hook-up procedures with example details. I was also surprised by the lack of information on YouTube regarding AC current leakage, which is essential for everyone to prevent shock from the device(s).Thank you,Steven

author: bdunham7
author_rank: Super Contributor
timestamp: March 04, 2024, 06:23:45 am
content: You're right, the short test parameters aren't clearly explained, although they do give a pictorial of the connections. They just say "red is bad". I assume it is just a higher protected current measurement intended to warn you that whatever you are probing is live. I would think the 10mA range would be good enough for that.

author: sfeinsmith
author_rank: Newbie
timestamp: March 08, 2024, 03:57:26 am
content: I spoke with Simpson Electric tech support yesterday. He explained that the short test mode was clear. I am still vague about the current modes from 10 mA to 0.3 mA. I will do experiments to understand the functions.Thank you,Steven
Looking for facts or general information on LVDT sensors and instruments. - Page 1
Forum section: electronics / testgear

author: Stringwinder
author_rank: Contributor
timestamp: March 07, 2024, 06:48:38 pm
content: Recently I found an old (1980's) instrument from Compac Géneve in my "to do" scrapheap.Two LVDT sensors with odd connectors showed that they were used together. Web searchesfor the manufacturers name gives nothing at all except from two hits on swiss auctionsites and those clearly show a connection to watch manufacturing. The highestsensitivity setting is ±199.0 µm (with a resolution of 100 nm (nanometer)).If anyone here has experience from LVDT use and the instruments used I can elaborateand give more details and my specific questions.
Fluke 289 to excel streaming - Page 1
Forum section: electronics / testgear

author: UKpat
author_rank: Newbie
timestamp: March 05, 2024, 10:24:36 pm
content: Hi alWas wondering if anyone here has managed to find a way of outputting the display info of a 289 to stream via usb to excel, hope this an acceptable question for this forum...regards Pat

author: BeBuLamar
author_rank: Super Contributor
timestamp: March 06, 2024, 04:57:32 pm
content: The USB to Fluke 289 is a serial to USB converter so if you write a VBA module to communicate with the com port you can do that. Use the information in this filechrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.uniteng.com/neildocs/facilities/Fluke289_remote_spec28X.pdfI was able to read from the 289 by writing a program with Visual Basic. So VBA for Excel wouldn't be too much different.

author: luma
author_rank: Regular Contributor
timestamp: March 07, 2024, 11:52:56 am
content: Sounds like an afternoon project with modern micros. Take something like an ESP32-C3, feed a uart the serial stream, and have it run the USB port as an HID device to emulate the keystrokes.Hell i’ll make the offer, send me a free 289 and I’ll have you a solution in a day

author: BeBuLamar
author_rank: Super Contributor
timestamp: March 07, 2024, 12:23:49 pm
content: There are pre made software (from Fluke and others) to records readings to a *.csv file which can be opened in Excel. Unless you have reasons that need the data to go into Excel directly those are easy solution.
Rohde & Schwarz DVG MPEG2 Generator repair - Page 1
Forum section: electronics / testgear

author: RichardG
author_rank: Newbie
timestamp: July 21, 2019, 04:42:13 pm
content: Hi,I have a Rohde & Schwarz DVG MPEG-2 Measurement Generator with a broken hard drive.Changing the HDD is not a problem for the hardware part, but does anyone know how it must be prepared (format, system, software) and where I can find the adequate software files ?I have spend hours searching through the web, unsuccessfullyThe device has been bought on ebay and I'm neither a professional nor a millionaire, so no chance to get something from R&S...ThanksRichard

author: nctnico
author_rank: Super Contributor
timestamp: July 21, 2019, 06:04:02 pm
content: Have you asked R&S? According to some it seems they can be helpful in some cases.

author: RichardG
author_rank: Newbie
timestamp: July 22, 2019, 01:44:07 pm
content: I haven't asked R&S, I thought I don't get any chance to get help as a non-professional, on old gearBut it is worth a try, I have nothing to loose...I'll first try with local R&S (France), and in case of negative answer, with central (Germany).

author: EEngo
author_rank: Unknown
timestamp: August 29, 2019, 08:36:44 pm
content: Hey Richard,check your inboxingo.

author: hermanherman
author_rank: Newbie
timestamp: March 08, 2024, 12:18:18 pm
content: Hi, I realize that this is an old topic, but unfortunately have the same problem with this nice device. Its disk tries to spin up three times but fails.I have tried to connect a keyboard and enter the bios setup to select the right startup-disk, but I did not manage to start the setup. No keys worked during boot, tried F1 , F2 , F3 , F4 , DEL and some more. The keyboard itself should be fine because later on it enters the any key and it re-prompts the insert diskette text.Replacing the disk with another one should be easy, but then again there is just an empty disk without bootfiles. Is there any chance that anyone of you can provide me with these files ? Any help would be appreciated, thank you.
HANMATEK-DOS1104 not ground referenced - Page 1
Forum section: electronics / testgear

author: VSV_electron
author_rank: Regular Contributor
timestamp: March 06, 2024, 02:25:22 pm
content: Hello!I should've probably posted this question in the 'Beginners' section of the forum but since this is a question about a specific device I place it here.There is a budget 4-channel DSO oscilloscope branded as HANMATEK (with a funny mirrored 'N') with the brand being closely related to the OWON line of the scopes. The model is 'HANMATEK-DOS1104'.Here it is:https://www.banggood.com/HANMATEK-DOS1104-Digital-Oscilloscope-with-4-Channels-and-Screen-7-inch-or-18-cm-TFT-LCD-Display-Portable-Professional-Oscilloscope-Kit-with-1GS-or-s-Sampling-Rate-p-2000243.htmlNormally all similarly constructed bench top DSOs are ground referenced but this one has a wall power adapter with no ground reference on the oscilloscope itself.I know that the ground reference in the scopes is for a reason (and there are quite a few reasons including the operator safety).I'm planning to use this device as a "better" (hopefully so!) alternative to the logical analizer for digital circuits such as 8-bit vintage stuff and MCU devboards.For the named applications what should be my main concern when working with such a 'ground unreferenced' scope on the mentioned board types? I certainly understand that I can fry digital boards by simultaneously connecting the multichannel scope's common ground clips to the "improper" circuit points but other than that what should be my "foolproof set of rules" when using HANMATEK-DOS1104 in its 'NOT ground referenced' configuration with the digital circuits?In other words what are the most obvious scenarious in which I could go wrong and be otherwise safe with the ground referenced scope again in the same application area?

author: modoran
author_rank: Regular Contributor
timestamp: March 07, 2024, 08:59:07 am
content: Just don't use the scope in the primary side of power supplies or anything tied directly to mains and there will be no problems.

author: VSV_electron
author_rank: Regular Contributor
timestamp: March 07, 2024, 11:33:28 am
content: Quote from: modoran on March 07, 2024, 08:59:07 amAt first I didn't give enough though to your advice and probably replied incorrectly. I rewrote it.I understand the meaning of your warning is NOT to connect some channel of the scope to the hot side of the SMPS and at the same time probing low voltage/signal parts of the DUT with other channels so not to accidentally transfer the high potential to the low voltage side of the circuit.
Agilent DSO3102A UART Pinout - Page 1
Forum section: electronics / testgear

author: franksretrolab
author_rank: Contributor
timestamp: February 16, 2024, 08:36:54 pm
content: Hello, I have an Agilent DSO3102A that has stopped booting.I am looking to connect a CH340 so that I can view the logs.I searched through and read many forum posts, and the only one I could find a post that had a photo of the pinout for the 3000X.I found a header on this board marked J12 and I tested a couple of the pins to ground to see if it was like the image and it was not.Pins 2 and 10 seem to go to ground....so I am trying to figure out which pins would go to Tx and Rx.I have attached a photo of the board.I am new to this so please forgive me if I am missing info, etc.Any help would be greatly appreciated.Thank you

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 06, 2024, 01:26:39 am
content: From theadsp-bf531 datasheet:81 TX82 RXTry tracing those pins to the 14-pin header, seems to be routed there, also the JTAG interface.
Hantek dso2d15 generate a frequency sweep - Page 1
Forum section: electronics / testgear

author: IW2evk Roberto
author_rank: Newbie
timestamp: March 03, 2024, 02:39:43 pm
content: Hi all,it's possible using the frequency generator of hantek dso2d15 for make a sweep from 300 to 5000Hz for testing the response of audio filter ?ThanksRoberto iw2evk

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 03, 2024, 03:34:18 pm
content: Not from the scope itself, but seems possible using SCPI:https://www.eevblog.com/forum/testgear/new-hantek-dso2x1x-models/msg5338418/#msg5338418

author: Aldo22
author_rank: Super Contributor
timestamp: March 04, 2024, 11:06:41 am
content: By the way, if you have any signal generator that can sweep (FY3200 will do, maybe even Tinysa), you can do it this way too:Set the sg sweep to the measuring range you need.In the example, I wanted to measure the 6.5MHz BSF, so I swept from 4MHz to 8Mhz in 4 seconds.Then you can set the trigger on the Hantek to "pulse" (in the example < 260ns) to get an (approximate) starting point (if the sg does not output a synchronization trigger).Then set Sec/Div so that the 4 seconds are captured (500ms in the example)Now you can measure with the cursors. In the example you can see that the low point is reached after approx. 2.5 seconds. This corresponds to the 6.5 Mhz.This is of course much more tedious and less accurate than with the script above and you need a sg that can sweep, but you get a first impression and it is less tedious than to write down the measured values..

author: ClubFoto
author_rank: Newbie
timestamp: March 05, 2024, 04:01:02 pm
content: In this video a signal generator is used, it seems advanced together with the DSO2D15 to perform the sweep:https://www.youtube.com/watch?app=desktop&v=fddIt2phegA
PLL board for HP sweep oscillators - Page 1
Forum section: electronics / testgear

author: EggertEnjoyer123
author_rank: Frequent Contributor
timestamp: March 04, 2024, 12:06:54 am
content: I created a phase lock board based on the LMX2491 to phase lock my sweep oscillator and turn it into a synthesizer. It seems to work with my HP 8620C and HP 86290A (some modification might be required for the 8350).The design files for everything are attached to this post. The microcontroller is a standard STM32 bluepill, the display is a standard 20x4 with I2C adapter board, and the keypad is just the standard 4x4 one.There are two modifications that need to be done to the 86290A's FM board. The mods ensure that the FM tuning sensitivity doesn't change when bands are switched. Apart from that, they shouldn't affect operation normally (when the switch is not set to PL). A CN-50 connector from Amazon was used to mate with the connector on the back of the 8620C. The board derives its power from the +20, -10, and +5 supplies on the 8620C.The loop bandwidth of the PLL is 300kHz and the phase margin is around 70 degrees.Some issues:1. The noise floor increases when the sweep generator is not in CW mode. In CW mode, you have to manually set the frequency close enough for the PLL to lock in, while in Ext Input mode, the DAC voltage gets fed in and automatically sets the frequency. I believe this is due to improper shielding, but not exactly sure. In CW mode, I got comparable performance to a commercial PLL module (well as far as my 8566 could measure).2. Spurs (especially at higher denominators). At 15.000001000 GHz, the fractional spurs are only -25 dBc. There probably is a way to get around this (for example: using two PLLs so the LMX2491 only needs to operate in integer N mode). There's also the possibility of adding dithering, but that just redistributes the noise and doesn't fix anything.3. My code is half baked and many features aren't implemented yet (like ramp/modulation).4. I am using a crappy DAC and the datasheet failed to mention it wasn't rail to rail (damn you LCSC). There's a bodge to get around that with some op amps, and you'll have to adjust the op amps if you use a different DAC.5. I have not tested the external 100MHz reference input option, or the modulation input.6. There are problems with the board resetting correctly on startup. Adding a 10uF to the microcontroller reset pin seems to work. (This capacitor is not in the design files, so you'll have to add it yourself). The BNC connectors for FM and phase noise7. The BNC connectors are too close for the FM and main tuning output. I was able to stuff in an SMA connector, though, and there is enough room for those to fit.Anyways you guys are free to do whatever you want with my design, just keep it open source though.
[Fixed] Agilent DSO3102A blown PSU, unknown IC (Exploded) - Page 1
Forum section: electronics / testgear

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 11, 2023, 02:26:45 pm
content: I heard a loud BANG coming from the testing area, 10 minutes later this scope arrived for repairing.The main SMPS IC completely blew apart, sadly coudn't find the flying pieces carrying the identification, neither found schematics for it.After analyzing the circuit implementation, it seems to match a TOP242-250 series, so I ordered a TOP250 (The most powerful one).However it would be great if someone could share a picture!

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 11, 2023, 06:12:31 pm
content: After discovering the 3102A was a rebranded Rigol DS5000, searched for old Rigol schematics, hopefully that part was also used in other series.Found the 1052 series hand-drawed schematics:http://rigol.codenaschen.de/index.php/SchematicsSo Indeed, a TOP247! (Just slightly lower power rating than the TOP250)

author: franksretrolab
author_rank: Contributor
timestamp: March 01, 2024, 12:59:39 pm
content: I know this topic is almost a year old, but I wanted to add a photo of the component so that if someone else is looking for this info, they would have it.The part appears to be a TOP246.Thanks

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 01, 2024, 06:46:23 pm
content: Thanks. For reference, the TOP250YN worked fine.The scope was still repaired only a month ago, took a full year for the purchasing department people! (They're are terribly lazy!)

author: slugrustle
author_rank: Frequent Contributor
timestamp: March 02, 2024, 04:59:44 pm
content: Any idea why this part broke? Was simply replacing the part sufficient to repair the scope?I've seen a failure in a flyback converter based on an IC like this where the following appeared to have happened:1. RCD clamp diode failed short, leading to TOPSwitch internal MOSFET overvoltage and failure.2. Internal MOSFET is now shorted while supplied through the flyback "transformer" from rectified AC mains. The transformer would quickly saturate.3. The clue was the fact that the drain lead on the TOPSwitch had vaporized.

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 02, 2024, 05:49:26 pm
content: Nothing else was found. Maybe just old, or a mains spike.

author: DavidAlfa
author_rank: Super Contributor
timestamp: March 04, 2024, 03:21:32 pm
content: @franksretrolab, here're the requested connector voltages, plus some waveforms.

author: franksretrolab
author_rank: Contributor
timestamp: March 04, 2024, 07:04:23 pm
content: Thank you so much.This is fantastic!I appreciate it!!
Which oscilloscopes support Agilent 1157A active probe ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: March 05, 2024, 02:25:57 pm
content: Hi,Could you tell which oscilloscopes support Agilent 1157A active probe ? I can’t find a supported list os scopes.Thank you.

author: Someone
author_rank: Super Contributor
timestamp: March 05, 2024, 10:10:43 pm
content: Its the other way around, you ask for a specific scope what probes it (officially) supports:https://prc.keysight.com/Content/Browse%20by%20Scope/3000T_x_series.html
Micsig Current Probe CP2100B - Size of Current Clamp - Page 1
Forum section: electronics / testgear

author: Excavatoree
author_rank: Frequent Contributor
timestamp: March 02, 2024, 11:15:36 pm
content: I hope this question is in the correct forum. I'm considering the current probe Dave sells, (currently out of stock) but I can't find the dimensions. Can anyone give me the rough dimensions for the current clamp?

author: Martin72
author_rank: Super Contributor
timestamp: March 02, 2024, 11:19:39 pm
content: Hi,https://www.batronix.com/files/Micsig/CP2000/CP2100_Data_Sheet.pdf
Setting Date and Time on Siglent SDS with a script - Page 1
Forum section: electronics / testgear

author: sibir
author_rank: Newbie
timestamp: August 15, 2020, 03:08:51 am
content: That the SDS1104X-E does not keep date and time is really annoying when saving PNGs or other files to a USB stick.I still have not given up hope that a future firmware update will let the scope fetch the time via NTP.But as tv84 and BillB have pointed out elsewhere, you can set date and time via SCPI. Then the scope will time-stamp saved files correctly until the next power cycle.To make life a little easier I now run the simple python script below to set the date and time. Note, that I assigned a static IP address to my scope.Once I get tired of that I might turn it into a cron job or systemd service on some Raspberry Pi I use for home automation.Code:import visa, timerm = visa.ResourceManager()inst = rm.open_resource('TCPIP::192.168.1.99::INSTR')inst.write(':SYST:DATE ' + time.strftime('%Y%m%d'))inst.write(':SYST:TIME ' + time.strftime('%H%M%S'))

author: tautech
author_rank: Super Contributor
timestamp: March 03, 2024, 10:56:20 pm
content: FYI SDS1*04X-ENTP support was added along with Logging in the V3 OS update along with FW update V6.1.37R2Links:https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1xx4X-E_EN.zip(OS update)https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1xx4X-E_6.1.37R2_EN.zipWith an active LAN connection and correct NTP settings to your local NTP server IP, real time can be displayed and file timestamps are added.Latest FW version is:https://int.siglent.com/upload_file/zip/firmware/Oscilloscope/SDS1xx4X-E_V6.1.37R10_EN.zip
Would Agilent 1165A work with Tektronix 2230 Oscilloscope ?  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: March 02, 2024, 12:10:54 pm
content: Hi,This question might seem odd. I need to know if Agilent 1165A would work with a Tektronix 2230 without any damage or problem to the 1165A. My Agilent infiniium scope repair went wrong and now I need a working scope, but I recklessly bought 1165A thinking the repair would succeed.If this doesn't work tell me some good scopes that would work with 1165A. I'm okay with either Agilent or Tektronix.Thank you.

author: wn1fju
author_rank: Frequent Contributor
timestamp: March 02, 2024, 01:48:04 pm
content: For what it's worth, my similar Agilent 10073D 500 MHz probe works perfectly well with my Tektronix 2230 scope. The 10x auto-sense functions correctly.I have mixed and matched Agilent/HP probes and scopes with Tektronix probes and scopes for decades. Never had a problem except that with scopes that don't correctly sense the 10x probe attenuation, sometimes you have to do some mental arithmetic (divide by 10) when reading the scope's V/div setting.There shouldn't be any way to damage the probe. It's not like the scope is supplying a lot of voltage to the probe.

author: David Hess
author_rank: Super Contributor
timestamp: March 02, 2024, 04:37:30 pm
content: The probe will work fine with any 1 megohm oscilloscope input that is within its compensation range of 10 to 25 picofarads. I do not see any way that it could be damaged.

author: MarkL
author_rank: Unknown
timestamp: March 02, 2024, 04:52:48 pm
content: I don't see any possible damage issues either, but the Agilent 1165A has an unusually narrow range for compensation of 12-14pF (maybe a misprint?). Snippet from the 1160 Series User's Guide below. The Tek 2230 is 20pF +/- 2pF.You might have trouble adjusting the compensation.

author: David Hess
author_rank: Super Contributor
timestamp: March 02, 2024, 09:54:54 pm
content: Huh, when I searched for it I was directed here where it says 10 to 25 picofarads:https://www.keysight.com/us/en/product/N2873A/passive-probe-10-1-500-mhz-1-3-m.htmlTry it anyway. Often the probe compensation range is pessimistic.
Rigol MSO 5074: Can't boot after the firmware update - Page 1
Forum section: electronics / testgear

author: IRG7PSH73K10
author_rank: Contributor
timestamp: October 10, 2023, 05:16:49 pm
content: Hi!I've tried to update the firmware of my MSO5074 from to v00.01.03.02.02 (https://www.rigolna.com/firmware/). After it said "update successfully completed, please reboot" I've turned the scope off, but when I've turn it on again it stucks at the end of loading (it shows a RIGOL logo and full progress bar). Any ideas how can I fix it? Holding a "SINGLE" button after powering the devise on did nothing.

author: IRG7PSH73K10
author_rank: Contributor
timestamp: October 10, 2023, 05:32:48 pm
content: OK, I've should just press a "SINGLE" button multiple times instead of holding it. Guess this one is solved... for now.Yup, the second try was successful, no idea what went wrong for the first time

author: EGR95
author_rank: Newbie
timestamp: March 02, 2024, 04:11:25 am
content: I have this issue as well. I restarted my scope after it said upgrade complete and now it will not boot. It just sits at the RIGOL loading screen indefinitely.How did you fix the issue?

author: mwb1100
author_rank: Frequent Contributor
timestamp: March 02, 2024, 04:48:02 pm
content: Quote from: ilyxa on February 14, 2023, 12:40:39 pm
Rigol 1102Z-E for multi-hour data acquisition? - Page 1
Forum section: electronics / testgear

author: shivahoj
author_rank: Newbie
timestamp: March 02, 2024, 09:44:12 am
content: I want to check Batteries of various chemical compositions for their discharge characteristics.Usually, their capacity is rated at discharging with a fraction of their capacity, like 0.2*C,so for a 1 Ah battery, the discharge current would be 0.2*1Ah=200mA, which would discharge that battery in 5 hours.I have a lot of high-power resistors, so setting up a current sink would not be a problem.I want to do this data recording on a linux computer, I was thinking of a complex setup with a multimeter measuring that current, a webcam capturing the display, imagemagick to cut away everything but the LCD of that multimeter, and tesseract(a free OCR software) to OCR and append the timestamp and value to a textfile. All that would run at fixed time intervals (say a minute) via a cron or python script.But I do have a Rigol 1102Z-E scope, how would I query the momentary input voltage via SCPI?Is there a "Triggerless" mode to do this without having a trigger event?That would make things a lot easier...Or how do You guys do this?

author: RoGeorge
author_rank: Super Contributor
timestamp: March 02, 2024, 09:55:16 am
content: Did something like that:https://github.com/RoGeorge/DS1054Z_data_loggerhttps://www.eevblog.com/forum/testgear/rigol-ds1054z-saving-logging-values-over-long-duration/msg1077151/#msg1077151I've used a LAN connection, and it was written/tested for DS1054Z, but should be easy to adapt the Python script to your oscilloscope model if you compare the SCPI commands between both models. Might just work without any changes at all.
FieldFox N9912A Firwmare Update from "A.01.00 Developer"? - Page 1
Forum section: electronics / testgear

author: ke5gdb
author_rank: Newbie
timestamp: March 01, 2024, 11:20:49 pm
content: Enough parts finally arrived from eBay to bring an N9912A back to life, but it has version A.01.00 Developer firmware on it. The functionality is exceedingly crippled in terms of being a spec an or VNA, and all indications are that the measurements are waaaaay off. I suspect it has no decent cal values.Current Keysight docs don't even reference firmware going back to A.01.00; the oldest I have found starts at A.03.00.Do y'all think I'm SOL or is there something worthwhile here? Any ideas on how to make this a usable instrument?

author: TheSteve
author_rank: Unknown
timestamp: March 02, 2024, 01:14:06 am
content: Wow, by far the earliest firmware I've ever seen or heard of. Does it have a firmware update option in the menus?The hardware may not support newer firmware.

author: ke5gdb
author_rank: Newbie
timestamp: March 02, 2024, 02:16:14 am
content: I believe it's the standard "CPU1" kit based on pics of other boards on eBay. I do not see any firmware update options in the menus. It definitely gives R&D unit vibes.

author: TheSteve
author_rank: Unknown
timestamp: March 02, 2024, 03:28:59 am
content: I'm sure the processor board is the standard one - but the main board that it connects to had several updates(I've seen many with wires and even extra chips added).You are probably correct that there will be no real cal data as well.The firmware is stored/booted from the processor board but does have to update the main/digital IF board and the RF board. So even if we got the processor board updated the other boards would need to support the automated update process.
Fluke Equivalent of EEVblog BM036 AC/DC Clamp Meter - Page 1
Forum section: electronics / testgear

author: PortalKeeper
author_rank: Newbie
timestamp: March 01, 2024, 12:17:15 am
content: Hello all, I’m new here and just was curious about the most likely Fluke equivalent (in features and build quality, not price) to the clamp meter listed in the title. Thanks for any information.

author: BennoG
author_rank: Frequent Contributor
timestamp: March 02, 2024, 09:43:08 am
content: What are your requirements for current ?And does it need to measure DC also or only AC ?Benno
AWG in Rigol DHO900S - Page 1
Forum section: electronics / testgear

author: TimFox
author_rank: Super Contributor
timestamp: September 30, 2023, 10:01:26 pm
content: I can't find the answer to this in the documentation I just downloaded.What is the output impedance (source impedance) of the AWG output?What are the limitations on load impedance for that output?(Specifically, can it drive 50 ohms?)

author: Martin72
author_rank: Super Contributor
timestamp: September 30, 2023, 10:48:20 pm
content: Hi,In the data sheet of the MSO5000, for example, the amplitude of the built-in AWG at 50Ohm and Hi-Z is explicitly described, if it is missing in the data sheet of the DHO900(S), I would first assume that the output is only "Hi-Z".We do not know until a DHO900S owner has measured the output.Otherwise, ask Rigol directly.

author: TurboTom
author_rank: Super Contributor
timestamp: October 01, 2023, 07:16:55 am
content: I'm pretty certain it's 50 Ohms like basically all signal generators. There was a post on the forum (most probably in the "Rigol's New DHO800 Oscilloscope unbox & teardown" thread) that I don't find anymore where two photos of the AWG section were published (basically only a D/A coverter, reconstruction filter and some OPAMPs, PSUs, attenuation and protection circuitry -- the "heavy weight lifting" appears to be handled in the Zynq). Sorry to the owner of the photos whom I cannot give proper credit here (would have posted a link if I had found the message again). But anyway, here are the photos. They clearly show four 49.9 Ohms resistors (two Top and two Bottom-side poulated) which is a dead-hint that it's impedance indeed is 50 Ohms.

author: Mechatrommer
author_rank: Super Contributor
timestamp: February 29, 2024, 10:35:19 pm
content: Quote from: TurboTom on October 01, 2023, 07:16:55 amcredit and many thanks to souldevelop...https://www.eevblog.com/forum/testgear/rigols-new-dho800-oscilloscope-unbox-teardown/msg5051812/#msg5051812
Leader LSG-231 Alignment Problems - Page 1
Forum section: electronics / testgear

author: DGSanders
author_rank: Newbie
timestamp: February 29, 2024, 05:57:03 pm
content: I have encountered problems with my Leader LSG-231 FM Stereo Generator. I have been able to accomplish all of the required alignment procedures in the service manual except for the Balanced Modulator. With the scope connected to the COMPOSITE output jack and trying to adjust VR401/VR402 for minimum 38Khz leakage; I cannot discern the 38Khz signal. I have tried moving the scope connection to the Emitter of Q405 and still having problems identifying when the proper balance is achieved. Can anyone comment on the procedures they have used and what they observed while adjusting the “Balance” pots?
trigger video DHO1074 - Page 1
Forum section: electronics / testgear

author: centauro1954
author_rank: Newbie
timestamp: February 29, 2024, 12:37:14 pm
content: in my Dho1074 the video trigger doesn't work, the seller tells me that all the Dho 1000 series have the same problem. Does this defect also affect you?

author: sorenkir
author_rank: Regular Contributor
timestamp: February 29, 2024, 03:22:42 pm
content: Hello,It is a known problem.See :https://www.eevblog.com/forum/testgear/new-rigol-hdo1000-12-bit-dso-bugs/?allMichel.
[Requesting Feedback] Open-source alternative to LabVIEW/TestStand - Page 1
Forum section: electronics / testgear

author: jpeev
author_rank: Newbie
timestamp: February 29, 2024, 11:23:17 pm
content: Whaddup test & measure folks!Flojoy has been working on an open-source alternative to LabVIEW / TestStand for the past 6 months:https://www.flojoy.ai/galleryAnd we could use some honest feedback.Flojoy download:https://docs.flojoy.ai/studio/installation/Test sequencer demo:Database UI for test sequencer:Decoding I2C data with a Tektronix oscilloscope:What would you like to see in a free alternative to LabVIEW/TestStand? What could we be doing better?Any ideas, thoughts, and feedback welcome!
Anyone have a list of Infiniivision option / license names ? - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 29, 2024, 03:26:54 am
content: Has anyone seen or created a comprehensive list of Infiniivision option and license names, and what they provide. The following is a list of names from actual license files (.xml) in a 3000T scope. I know most of them and the function group they represent but some are still confusing across the years and bundles.For instance, didenhTvTrig_3ksimply becomeVIDor did the capabilities change as well?Were several, likeFRA, NRZ and NFC, introduced with a firmware version upgrade? Such upgrade, I guess, would have dropped the corresponding .xml license files in place. I see FRA was a separate option for sale.These are from a scope with DSOXT3APPBNDL, several were or have become standard:cxpiSerDecode_3keducationamSerDecode_3ti2sSerDecode_3knfc_3kdigVoltMeterCtrlsSerDecode_3kaeroSerDecode_3kflxSerDecode_3kwavegen_3ksegmentedMem_3klimitMask_3ksentSerDecode_3kpower_3kfra_3kenhTvTrig_3knrzSerDecode_3k232SerDecode_3kI also see that this is somewhat of a cluster and apologize for a not so simple question. Unless someone was brave enough to make a list ...added - after another few hours looking at the overlap in the various bundles, I can see why Keysight technical support seems totally confused by the offerings.

author: J-R
author_rank: Super Contributor
timestamp: February 29, 2024, 04:12:36 am
content: https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/msg3823583/#msg3823583

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 29, 2024, 04:22:35 am
content: That is totally awesome. I thought there had been something but after many searches, I was empty handed.Thank you !
Omicron LF common-mode choke - Page 1
Forum section: electronics / testgear

author: jmw
author_rank: Frequent Contributor
timestamp: February 29, 2024, 11:39:41 pm
content: Dave did a teardown of the Omicron injection transformer and bunch of us built our own imitations, but has anyone peeked inside their B-LCM common mode chokehttps://www.omicron-lab.com/products/vector-network-analysis/accessories/b-lcm/?They have charts showing 40 dB common mode attenuation at 1 Hz. What kind of core material is going to be effective at that frequency?

author: slugrustle
author_rank: Frequent Contributor
timestamp: March 01, 2024, 12:30:41 am
content: The footnote for the "B-LCM typical common mode rejection" graph reads: "S21 measurement (Bode 100 output signal is fed to inner and outer conductor of B-LCM input connector,B-LCM output signal is connected to input of Bode 100 and terminated with 50Ω)"Which I take to correspond to the attached drawing. If the combined impedance of the "ground" side of the common mode choke and associated wiring is ~505mΩ or less at 1Hz, this gets you an attenuation of 40dB against a 50Ω source all by itself, even ignoring both the impedance in the "signal" side of the common mode choke and the 50Ω termination on the bode analyzer input.I agree with you that the 40dB attenuation figure definitely does not seem right, and it's probably down to test setup. The common mode inductance is specified as 75mH at 1kHz, and that's probably a more useful figure here.
New Siglent SPD lab supply? - Page 1
Forum section: electronics / testgear

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: February 28, 2024, 11:11:06 pm
content: Can anyone identify the Siglent supply in this image?Looks like a new model.

author: KungFuJosh
author_rank: Super Contributor
timestamp: February 28, 2024, 11:14:56 pm
content: https://www.eevblog.com/forum/testgear/new-siglent-spd4000x-series-power-supply/

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: February 28, 2024, 11:23:13 pm
content: Thanks Josh, that thread eluded me.Edit: Seems it's not available outside China (yet?)