hybridfree/eevblog-posts huggingface dataset:
Brymen BM789 LCD 'glare' - Page 1
Forum section: electronics / testgear

author: thejackal
author_rank: Newbie
timestamp: May 21, 2025, 09:47:06 am
content: Hi all,I bought a Brymen BM789 and it has a strange 'glare' on the LCD when close to a window, having day light behind you.That is also visible when close to a computer monitor. See the attached photo's. It's also visible if the DMM is off.I sent it back and got a new one with the same issue. :'(Do others recognize this? Do all the BM789's have this issue or is it a faulty production batch of the LCD's?(FW version 78913)Regards,Carlos

author: Kean
author_rank: Unknown
timestamp: May 21, 2025, 11:19:53 am
content: This is likely some caused by some stress in the plastic window, combined with your light source and maybe the LCD polarizing filter.https://en.wikipedia.org/wiki/Birefringence#Stress-induced_birefringenceI wonder if you have polarizing filter (tinting) on your windows, or if the polarized sunlight reflected back from the DMM's LCD with polarizing filter is enough for this to be visible.The light coming from your monitor backlight would be polarized by the monitors polarization filter.It is a common enough optical effect, and not really a fault. Pretty sure it has been reported before here but I can't immediately find any related posts.

author: thejackal
author_rank: Newbie
timestamp: May 21, 2025, 11:58:16 am
content: >> I wonder if you have polarizing filter (tinting) on your windows,Well... no. An open window (or door) and with direct (no glas) light from outside has the same effect.The same situation has no effect at all on other meters (LCD's) whatsoever.Thanks for your reply. I'm getting unsure now about keeping the DMM or not.
Micsig VTO2004 - Page 1
Forum section: electronics / testgear

author: adam4521
author_rank: Regular Contributor
timestamp: May 20, 2025, 04:32:00 pm
content: I was poking around on Telonic website and saw the Micsig VTO2004, which I hadn't come across before, and hasn't been discussed much on EEVblog as far as I can find.It's a battery powered USB oscilloscope. The raw offer does look good -- 4 channels, 200MHz, 50Mpts buffer, FFT, high/low digital filters, for £246 incl. VAT.The immediately apparent downers appear to be that you need an Android tablet to use it (or configure an emulator on a PC). It has decoders but only for LIN and CAN. Sample rate not good enough for full bandwidth on all channels.But what do people think? Is it a candidate for 'low cost scope'? Has anyone got one?https://telonic.co.uk/product/micsig-vto-2004-4ch-200mhz-1gsa-s-android-usb-oscilloscope/

author: ptluis
author_rank: Frequent Contributor
timestamp: May 20, 2025, 04:40:11 pm
content: Quote from: adam4521 on May 20, 2025, 04:32:00 pmDoesn't have XY mode, it works fine and its easy to operate. The vato and the vto exists in two variations with or without battery. I advise you to choose with battery. If you already own an Android tablet you're good.BUT be aware that it doesn't work with Android GO versions, most of the low cost android tablets has the go version pre-installed.
Quality USB (or ethercat) weighing scales / load-cells ? - Page 1
Forum section: electronics / testgear

author: dav888
author_rank: Regular Contributor
timestamp: February 02, 2025, 12:22:39 pm
content: I've been looking for a reliable and somewhat precise USB-scale.• Form factor, square or small puck <100mm to fit in your backpack (not a letter scale)• preferably with threads for screw mounts• resolution of 0,1 grams would be enough (calibrated)• documented "API" to stream data at minimum 1kHz• communication preferably via USB, but EtherCat or RS-232 could be ok too (more common in industrial gear..)

author: dav888
author_rank: Regular Contributor
timestamp: May 19, 2025, 10:56:02 pm
content: bump

author: darkspr1te
author_rank: Frequent Contributor
timestamp: May 20, 2025, 07:25:17 am
content: you should checkout brecknell scales and equipment,they have quite a range.darkspr1te
E3631A power supply: significant differences between HP/Agilent? - Page 1
Forum section: electronics / testgear

author: hp3310a
author_rank: Regular Contributor
timestamp: May 20, 2025, 05:19:31 am
content: I'm contemplating buying what looks like an Agilent E3631A but I have a suspicion about it being really an older HP unit with an Agilent front display window (the serial label is missing). So far I have found E3631A units from different eras:HP with serials KR64.... Made in KoreaHP with serials KR89.... Made in KoreaAgilent with serials MY39.... Made in MalaysiaAgilent with serials MY40.... Made in MalaysiaAgilent with serials MY52.... Made in MalaysiaAgilent with serials MY54.... Made in MalaysiaKeysight with serials MY56.... Made in MalaysiaThere are probably more.So the question is, are there significant design differences? Judging from the back panel print, "my" unit looks like a KR89...Edit: I noticed that the KR64/89 units (that I found) have the GP-IB connector label saying "HP-IB", whereas the Agilent units call it "GP-IB". Might that be a definitive way to distinguish HP from Agilent devices?Edit 2: Apparently not, I found one Agilent with MY40... serial where the connector label is "HP-IB"
Firmware Backup: Cami Research CableEye M3U Cable Tester - Page 1
Forum section: electronics / testgear

author: KG7AMV
author_rank: Frequent Contributor
timestamp: August 31, 2024, 07:49:24 pm
content: Firmware Backup Cami Research CableEye M3U Cable Tester

author: KG7AMV
author_rank: Frequent Contributor
timestamp: October 31, 2024, 09:26:52 pm
content: I received another CAMI Cable Eye M3U (FPX) this one had a Different MCU a C8051F342 vs a C8051F320 with Version 1.23 of firmware I have successfully back it up.https://www.youtube.com/shorts/De0U_vgKTRc

author: KG7AMV
author_rank: Frequent Contributor
timestamp: May 22, 2025, 06:19:16 am
content: I noticed in one of daves latest Videos he was intrigued by the cami cable tester. 16:40https://youtu.be/zhnhfhyt6Sk?si=4XBjq5uu5XY5cO5h&t=1000
BT/BLE 2.4GHz production test gear - Page 1
Forum section: electronics / testgear

author: dav888
author_rank: Regular Contributor
timestamp: May 17, 2025, 09:00:25 am
content: Hi,Browsing for test equipment for rf testing of bluetooth LE devices in a factory setupthe traditional test-houses would offer a shield-box + expensive ($20.000+) test tools likeAnritsu MT8852LitePoint IQXELor even the more old CMW270 or N4010also, I don't like that you must use a windows machine to run them...I prefer full standalone + remote-control so you can use Linux to trigger + capture test results.If money wasn't an issue, the LitePoint is by far best since it can run wire-free (OTA) and measures all you need with minimal software needed on the DUT side. Just enable advertise and the IQxel will measure this for you:TX PowerFrequency Offset, Frequency DriftAdjacent Channel PowerDelta F1, Delta F2 (FM deviation)Packet Error Rate (PER)Receiver SensitivityI've tested some alternative solutions but so far haven't found an optimal hardware.requirements are simply:Calibrated / Absolute measurements (frequency and gain)Must work on Linux / ARM (raspberry)Good pricethings I've testedRF Explorer (unstable, large deviations on rx measurements between devices = n.g.)Aaronia spectrum analyzers (only x86, no ARM due to simd impl.)SignalHound (best so far, decent price, good software, used them a lot... but huge disappointment that they refuse to do ARM 64-bit, so mess to run on more recent hardware like Rpi 5NI's SDR's (great hardware, linux support but no focus on absolute measurements, they would require a complex manual pre-calibration setup to work in a test setup environment)Any tips?

author: nctnico
author_rank: Super Contributor
timestamp: May 17, 2025, 09:33:23 am
content: I'd get a regular spectrum analyser and control it remotely using some Python scripting. I'd also think hard about the minimum requirements to get good test coverage and cost versus gain. If you use an RF chip with a single RF in/out then the external parts are likely a filter, matching circuit and antenna. Part of testing the chip at the factory will include checking for signal transmissing / reception. So if you get a signal from your device within limits, chances are extremely high the RF part of your device is working. This can be tested very quickly and with simple equipment. An RF power meter might be enough.

author: david300m
author_rank: Newbie
timestamp: May 17, 2025, 03:39:24 pm
content: Hi Dave,Curious, why is the Raspberry/ARM a hard requirement? There are plenty of compact x86 Linux platforms that can be deployed for EOL testing. Which SignalHound model did you test.ThanksDavid

author: dav888
author_rank: Regular Contributor
timestamp: May 19, 2025, 10:54:18 pm
content: re x86, its more that I like the simplicity of using raspberry's.but open to hear suggestions on stuff that might only work on x86.best is of course measurement hardware that runs standalone and just offer a high-level API over usb to fetch the resultsthe problem with the Signalhound BB60C is that it runs half of the work on the PC itself, thus far from ideal in a setup like this
Why some DMM's have negative display? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 19, 2025, 11:12:45 am
content: The negative display has more contrast and is clearer in relatively dark environment. However, the backlight required would consume more power than the DMM measuring cicuitry. For a bench top that's good as you always run it on AC and you don't use it outside in bright sunlight. For a handheld battery operated DMM the use of negative display wastes battery power and when in very bright light is hard to read.

author: Zenith
author_rank: Frequent Contributor
timestamp: May 19, 2025, 11:43:12 am
content: They are eye catching and visually attractive, and so an inducement to buy, especially if people haven't thought too much about battery life.For bench top DMMs where power consumption isn't normally an issue, I prefer LED displays. There are bench top DMMs with a battery option where LED displays are not so great.
want: Tek576 collector knob (366-1007-00/-01) set screw hole height - Page 1
Forum section: electronics / testgear

author: squadchannel
author_rank: Frequent Contributor
timestamp: May 18, 2025, 12:17:58 pm
content: I am looking for someone to measure the height from the bottom of the knob to the center of the set screw hole.I found some dimensions on the qservice page. but not listed set screw height.same knob used in 7L13 SA and some TM500 series plugins.also posted this in the tekscopes forum.

author: squadchannel
author_rank: Frequent Contributor
timestamp: May 19, 2025, 05:09:15 am
content: nobody knows?

author: squadchannel
author_rank: Frequent Contributor
timestamp: May 19, 2025, 07:10:29 am
content: imagined.10.16mm from knob bottom.

author: tautech
author_rank: Super Contributor
timestamp: May 19, 2025, 07:23:58 am
content: Think in Imperial
Faulty Brymen BM235 Meter - Page 1
Forum section: electronics / testgear

author: Cnocci
author_rank: Newbie
timestamp: May 17, 2025, 02:39:22 pm
content: Hey!I'm experiencing issues with my EEVBlog-branded BM235. It seems to get stuck in some sort of startup phase (see the attached picture).I opened it up, and nothing seemed weird during visual inspection. I cleaned the contacts and put in fresh batteries, but there was no change. It has not been used that much and has been stored away in a box for a year. I pulled it out yesterday, and that's when this issue came up. I've watched a few of Dave's videos diagnosing issues with the BM235, but none of the videos that I saw had similar symptoms to my meter. At least that I know of.Does anyone have any idea how to fix it?

author: J-R
author_rank: Super Contributor
timestamp: May 18, 2025, 08:05:42 am
content: I would suspect the somewhat-known Brymen bit rot issue. Hunt down your receipt and try for a warranty claim?

author: Cnocci
author_rank: Newbie
timestamp: May 19, 2025, 05:56:45 pm
content: Found the receipt and have contacted the seller for a warranty claim. Let's see how that goes...
Low cost DSO and signal generator suggestions - Page 1
Forum section: electronics / testgear

author: garvind25
author_rank: Regular Contributor
timestamp: May 16, 2025, 08:57:43 pm
content: Hi,Can anyone suggest a low cost two channel, 20 MHz BW, 1 GS/sec DSO for hobby ckt purposes? Also need a simple , easy to use signal generator to go alongwith.Thanks in advance,Arvind Gupta.

author: KungFuJosh
author_rank: Super Contributor
timestamp: May 16, 2025, 09:25:52 pm
content: Hi,It would help if you stated what you want to do with it, and what your budget is. "Low cost" is a relative term.Thanks,Josh

author: Aldo22
author_rank: Super Contributor
timestamp: May 16, 2025, 09:37:59 pm
content: Quote from: garvind25 on May 16, 2025, 08:57:43 pm1GSa/s with only 20MHz bandwidth?Does that even exist?

author: DaneLaw
author_rank: Frequent Contributor
timestamp: May 16, 2025, 10:10:27 pm
content: use the search..basic due diligence, its been handled many times .. and will give you an idea of what it is, and what values you can expect.

author: Fungus
author_rank: Super Contributor
timestamp: May 17, 2025, 08:25:53 am
content: Quote from: garvind25 on May 16, 2025, 08:57:43 pmHere's one that has SG as well!https://www.eevblog.com/forum/testgear/another-dsodmm-zeeweii-dso3d12-claimed-120mhz250msps/

author: garvind25
author_rank: Regular Contributor
timestamp: May 18, 2025, 04:34:48 pm
content: Thanks for the replies. I am looking for a DSO under $100 which I can get in India. Aliexpress unfortunately is not an option here. Aim is to play around with hobby ckts involving uCs and FPGAs.
KWS-2302C USB Meter -- Help: Voltage Calibration Issue - Page 1
Forum section: electronics / testgear

author: jewelie
author_rank: Regular Contributor
timestamp: May 17, 2025, 04:57:48 pm
content: I accidentallybrokethe calibration on my cheapKWS-2302C USB meterby running it underpowered (supposed to be4V-36V-- I left it connected to a nearly 5V solar panel.)I discovered it reading~4.9Vwhen the panel voltage was actually only~3.6V-- so although it could just be data corruption, the proximity to 5V makes me suspect a mystery 5V recalibration procedure got triggered somehow?The manual/internet gives info only for zero current offset calibration (hold down the only button on it whilst you power it up.) Unfortunately,that doesn't do a 5V voltage recalibration that these sorts of devices normally can do.I was ready to bin it, but opening it up for fun revealed regularly labelled components and including a 32-bit ARM Cortex M0+ MCUhttps://www.puyasemi.com/download_path/%E6%95%B0%E6%8D%AE%E6%89%8B%E5%86%8C/MCU%20%E5%BE%AE%E5%A4%84%E7%90%86%E5%99%A8/PY32F002A_Datasheet_V0.2.pdf, and 4 test pads (V, D, C G) which were presumably for factory firmware writing after construction, andmaybetriggering the initial 5V calibration?It's quite handy (not to mention that it only eats a surprisingly small current = ~6mA @ 5V.)Given it's a Hail Mary situation, and in the bin otherwise, I tried briefly grounding each MCU pin in case it triggered anything, without luck (or apparent further breakage.)Does anyone here has any thoughts on how I might be able to (properly) trigger the 5V recalibration?What methods for 5V calibration might you have implemented if you had designed this?

author: jewelie
author_rank: Regular Contributor
timestamp: May 17, 2025, 05:05:09 pm
content: PS Unless the brown detection on the MCU on mine is iffy, I suspect thismightbe an issue across this model, as I had previously seen current wacky numbers come up when the voltage dropped below 4V but it hadn't resulted in the V calibiration going off kilter though. Earlier models of the same brand (i.e. KWS-MX18) don't break with low voltages. I can't really complain though when I was using it outside of the stated acceptable input voltages. And especially given it was only £3 FFS.
Agilent PXI data N7150A, N7157A,  M9430A, Etc - Page 1
Forum section: electronics / testgear

author: ZL1CVD
author_rank: Regular Contributor
timestamp: September 03, 2018, 06:05:42 am
content: Hi I'm trying to locate datasheets and drivers for some older Agilent PXI cards N7150A, N7157A & M9430A. I can find scant reference to some but nothing really useful. Any bright ideas?

author: ZL1CVD
author_rank: Regular Contributor
timestamp: October 29, 2018, 03:46:40 am
content: Managed to extract M9430A Windows 7 64-bit drivers from the E6640A XSA installer off Keysight website.Device manager now shows it so does VISA.For NI VISA to see it, you must install the horrible Keysight IO libraries. They seem to have removed handy features from the older Agilent version & have no idea how to write an uninstaller - leaves rubbish all over the hard drive and in the registry.Now to see if I can write some useful tools to get this Vector Signal Transceiver cracking...73s de chris zl1cvd

author: tmbinc
author_rank: Frequent Contributor
timestamp: October 29, 2018, 11:07:19 pm
content: What's in a E6640A? I assume 4xM943{0,1,2}A, and some 100MHz source. Is there anything else?

author: ZL1CVD
author_rank: Regular Contributor
timestamp: October 31, 2018, 06:26:51 am
content: ..a controller running Win 7-64bit. Not sure what else..

author: tmbinc
author_rank: Frequent Contributor
timestamp: November 21, 2018, 09:44:40 am
content: So I obtained a M9430A (be careful; those that are currently on ebay tend to miss parts because someone mishandled the PCB. Especially, some are missing the outermost LTM4601V, which means the PCB was bent enough that it popped off.. oops), and tried to get it working.Installed the E6640A software, and figured out the right config files to create. Created a E6640AModules.conf, xSAInstConfig.xml with (hopefully) the right contents. My setup is an M9018A (18 slot PXIe Gen2 chassis) with M9021A (Gen 2, x8 PCIe cable interface) to a Dell T3600 using a M9047A (PCIe Desktop adapter), so not quite the original setup. On top of that, I'm missing the M9300A frequency reference so I supply an external 100MHz instead. I patched the DLLs to remove the dependency on M9300A and the chassis control.However, something is definitely broken with my module, because the self-test fails for one of the voltages on the receiver board:[...]Receiver;FD1;1000;-100;Receiver_Digital_1_2V 0.675558 1.1 1.26 FAILReceiver;FD1;1000;-100;Receiver_Digital_1V 0.99115 0.441 1.54 PASSReceiver;FD1;1000;-100;Receiver_Digital_1_8V 1.76566 1.64 1.89 PASSI tried to power up the board on my desk, but did something stupid and now I need to replace the 74TVC16222A level shifter. (Duh!)The M9430A isn't bad hardware though; it's a 6GHz VSA/VSG with a 1GS/s DAC on the VSG side, and 400MS/s ADC on the VSA side, providing 160 MHz of analysis bandwidth...I wonder how different they are to the M9420A (VXT). They look identical, the specs are identical.

author: KD1RX
author_rank: Newbie
timestamp: May 16, 2025, 07:57:39 am
content: Did either of you ever get the M9430A to do something useful? I picked one up and got the drivers installed, but that's as far as I've made it so far.
Alternative to Fluke TrendCapture (event based logging) - Page 1
Forum section: electronics / testgear

author: mvno_subscriber
author_rank: Regular Contributor
timestamp: May 16, 2025, 05:54:39 am
content: I'm looking for a multimeter with data logging, but my needs are such that I need to check for intermittent faults / changes over a long time (typically overnight or a few hours). It seemed to me that the only options I have then are Fluke 289 with TrendCapture (that handles event based logging down to 100ms), or perhaps a meter with a large amount of memory and short measurement intervals (EEVBlog 121GW popped up).I can get the Fluke 289 used for about $300-$400. I already have a Fluke 175 which is my main driver (I bought it especially due to AutoHOLD and great continuity tester), but the 289 (and the 121GW for that matter) has a lot of interesting features that would come in handy, however nothing essential at this point.I guess my question is, are there other options out there for data logging that can either do event based or has tons of memory and high sample rate (10Hz or better) that's cheaper? It must be a standalone instrument (i.e. no smart phone), battery driven and preferrably simple connectivity to PC or USB stick for transferring data.
Differences between Siglent SDS1000C and SDS1000D. Are FWs compatible? - Page 1
Forum section: electronics / testgear

author: EduardoLM
author_rank: Contributor
timestamp: May 19, 2025, 10:08:39 pm
content: As I mentioned in another topic, I have an old ADS1022C scope, which is a clone of SDS1022C. I'm hunting a FW upgrade for a long time. Now I finally got a FW, but for SDS1000D!Researching the specs, the only difference I can see is that memory on C is 4k points, and on D it's 32k points. The rest is identical, both are small 5.7" LCD, and everything else is the same. So here goes my question: is the SDS1000D firmware compatible with the SDS1000C? On some scopes, some HW differences are reflected on CFG files, but FW is the same. Any info on this?And a related question: does anyone know about some kind of memory upgrade, to turn a C unit into a D? Just like the SDS1000CNL can be upgraded to SDS1000CML just by adding a bigger memory chip and flashing the CML firmware. This would be the best option for me!Anyway, any info on this would be great, thank you all.Eduardo
HP E6380A - 8935 Series CDMA test set - frequency range - Page 1
Forum section: electronics / testgear

author: 486dx4
author_rank: Newbie
timestamp: May 15, 2025, 02:30:41 pm
content: Hi All - I have a question on the HP E6380A - 8935 Series CDMA test set. The specs say 0.4 to 1000 MHz and then 1.7 to 2.0 GHz. It supposedly can do some analog radio testing. The question is does anyone know if this set can generate/receive/operate on 1.2 GHz by chance (say 1288 MHz - the 23 cm ham band) or no? The specs seem to say no you cannot, but I was curious.Thanks....

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: May 15, 2025, 05:36:02 pm
content: No, id does not operate in that freq range and I do not know of any way to change that.Here is a group that specializes in these Service Monitorshttps://groups.io/g/HP8924-Family-Spectrum-Analyzers/topics
E44xxB ESG Signal Generator, A/D Service Software Problem Communicating  - Page 1
Forum section: electronics / testgear

author: EE54
author_rank: Regular Contributor
timestamp: May 15, 2025, 05:07:18 am
content: I have an ESG E4432B ESG signal generator that I'm repairing. I'm trying to run some test using the ESG Service/Cal sw found here:https://www.keysight.com/us/en/lib/software-detail/computer-software/e44xxb-esg-signal-generator-ad-service-software-1000001117epsgsud.htmlI'm using a Win XP machine and an Agilent 82350B PCI-GPIB card.Both the GPIB card and ESG sig gen are recognized by the Agilent Connection Expert.But everytime I try to run a test using the service sw I get this error:#207: EQUIPMENT ERROR. Model: E4432B, Serial Number: MY41310283, Driver: C:\HP_SVC\DRIVERS\DRV4400B.dll SICL libraries could not be initialized Verify HPIB addresses and connections, and if the problem persists, reboot your system.Anyone has any experience with this issue? Thanks in advance.

author: squadchannel
author_rank: Frequent Contributor
timestamp: May 15, 2025, 05:56:17 am
content: https://bbs.elecfans.com/jishu_1809989_1_1.htmlQuote

author: EE54
author_rank: Regular Contributor
timestamp: May 15, 2025, 02:29:07 pm
content: I tried that too. No luck unfortunatelyStill same error

author: EE54
author_rank: Regular Contributor
timestamp: May 15, 2025, 02:31:11 pm
content: Oops, wrong photo

author: Tony_G
author_rank: Super Contributor
timestamp: May 15, 2025, 03:01:10 pm
content: The SICL interface ID needs to be HPIB7 not GPIB7 -https://www.eevblog.com/forum/testgear/installing-the-hpak-falcon-service-software-for-e44xx-signal-generators/msg4792433/#msg4792433TonyG

author: EE54
author_rank: Regular Contributor
timestamp: May 15, 2025, 04:06:27 pm
content: This is rather embarrassing on my part. I though I can only select "gpib" addresses from the drop down menu. Could have just typed in "hpib7" manually. Did that and it's working now. Thanks everyone for your help.
Looking for Yokogawa DL2700 Boot Disk Image - Page 1
Forum section: electronics / testgear

author: cattlot
author_rank: Contributor
timestamp: May 15, 2025, 11:30:24 am
content: I have a Yokogawa DL2700 digital oscilloscope that powers on and prompts for a boot disk, but there’s no internal hard drive and I don't have the original boot floppy. It seems the scope is designed to boot its OS/application entirely from floppy.If anyone owns one or has imaged the original boot disk, I’d be very grateful — even a partial image or file listing could help me reconstruct it. Happy to host it for others too.Thanks

author: Kean
author_rank: Unknown
timestamp: May 15, 2025, 02:22:28 pm
content: Please do not make duplicate posts - it is against forum rules.Original:https://www.eevblog.com/forum/repair/yokogawa-dl2700-no-os/
N4690 ECal EEPROM - Page 1
Forum section: electronics / testgear

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 15, 2025, 12:38:51 am
content: Does anyone have an EEPROM image from an Agilent / Keysight N4690 series (N4691 N4692 N4693 N4694) ECal module? You know, one of these:https://xdevs.com/pow/n4691a_pow/I would like to look at the USB protocol so that I can build a translator for my Anritsu ecal modules. The N4690 evidently just uses a CY7C64613 EZ-USB chip, so the contents of the EEPROM at U2 (which looks paralleled with socket U6) should contain the info I need. Alternatively, if anyone has a USB recording of a cal session laying around or would be willing to take such a recording (I'd be happy to provide my USBlyzer key if it helps), that would also be great.
FLIR CM85-2 calib procedure - Page 1
Forum section: electronics / testgear

author: alan.bain
author_rank: Regular Contributor
timestamp: May 13, 2025, 08:24:31 pm
content: Does anyone have any details of the calibration procedure for the Flir CM85-2 clamp meter. I'm not sure it is actually made by FLIR - it could well be badge engineered. The official line is that such things aren't made available to the great unwashed public. I guess this means it's a reverse engineering challenge...but thought I'd ask before embarking.Alan
Brymen BM2251 - Page 1
Forum section: electronics / testgear

author: markm6164
author_rank: Contributor
timestamp: May 13, 2025, 06:10:03 pm
content: Hi,I have a Greenlee DM-210A and a ACT 6000 multimeter. Can I datalog with these meters? I have the BRUA-20X cable. I have tried it with the Brymen BS225x software and the testcontroller software selecting BM2251. I can't get either to work. I also have a Tempo MM810 that I was going to buy the USB cable for but not sure it that will work either.Thanks

author: HKJ
author_rank: Super Contributor
timestamp: May 13, 2025, 06:21:10 pm
content: Quote from: markm6164 on May 13, 2025, 06:10:03 pmTry selecting a meter from the BM250 range of meters.

author: markm6164
author_rank: Contributor
timestamp: May 13, 2025, 06:28:21 pm
content: Both meters are now working using BM251s. Also, I appreciate the time and effort you have put into this software. Thank you.

author: HKJ
author_rank: Super Contributor
timestamp: May 13, 2025, 07:15:29 pm
content: Quote from: markm6164 on May 13, 2025, 06:28:21 pmThanks for the report, I will add them with their own names from next release.
New Rigol dho804 does not boot - Page 1
Forum section: electronics / testgear

author: ahmedfotoh
author_rank: Contributor
timestamp: May 12, 2025, 06:02:22 pm
content: I just bought a new Rigol Dho804 Oscilloscope, when I turn it on the display stays appears Rigol logo and still appear to 5 minutes until a message appears to reopen application, other time the screen still black and no Rigol logo appears. and no boot to the operating system, and no something until I turn off, and repeat the same thing, I use the original power adapter came with scope, I think it is faulty SD card I open the cover and get out the SD card and reinsert but no nothing the screen still black and no booting to scope system, How can I install Rigol android operating system in a new SD card?

author: Martin72
author_rank: Super Contributor
timestamp: May 12, 2025, 06:59:51 pm
content: Hi,You can read through this thread:https://www.eevblog.com/forum/testgear/rigol-dho800-(814)-failing-to-boot-up/msg5781645/#msg5781645You should find what you're looking for there, otherwise ask in the thread.

author: ahmedfotoh
author_rank: Contributor
timestamp: May 12, 2025, 07:03:06 pm
content: @Martin72 Ok many thanks for reply

author: ptluis
author_rank: Frequent Contributor
timestamp: May 12, 2025, 07:13:54 pm
content: Quote from: ahmedfotoh on May 12, 2025, 06:02:22 pmIf you bought it on Banggood I advise you to return it. The unit I bought from banggood lived for 10 minutes then never work again. I return it asap.OR you could check the supplied power supply. The power supply on some reports doesn't apply enough power for the scope to operate properly, maybe some batches are defect, pcb?, cable?, usb-c connector?

author: ahmedfotoh
author_rank: Contributor
timestamp: May 12, 2025, 08:55:29 pm
content: I bought it from Alibaba, I tried other power adapter 15V 4A but it is still the black screen,
Does anyone know what this connector is? - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: May 12, 2025, 04:42:51 pm
content: Hi....Google knows everything; you just have to ask the right question or phrase it correctly.And that's where I'm failing right now.It's an isolated support base where you can solder or wrap wires.I had one in my hand decades ago, but I can't for the life of me remember what it was called.Here's a somewhat scribbled sketch from memory; maybe one of you knows what it's called.Thanks!

author: Gribo
author_rank: Frequent Contributor
timestamp: May 12, 2025, 04:44:48 pm
content: Turret connector:https://www.digikey.com/en/products/filter/terminals/turret-connectors/328?msockid=3620c9019f6e6b990142da999eba6ad2&s=N4IgjCBcoKwBwE4qgMZQGYEMA2BnApgDQgD2UA2iACxhhwAMEAusQA4AuUIAyuwE4BLAHYBzEAF9iYAGwIqyEGkhY8RUhWr0ATAhhIWIDl16DRE8eKA

author: Martin72
author_rank: Super Contributor
timestamp: May 12, 2025, 04:46:12 pm
content: Wow, that was fast !Thanks
B&K precision 1850 frequency counter - Page 1
Forum section: electronics / testgear

author: paul cotter
author_rank: Regular Contributor
timestamp: May 12, 2025, 05:16:39 pm
content: Hi, I'm new here. I am a retired engineer having worked in broadcast radio and power engineering+ lots of general electronics. I have this ~45year old counter that has required many repairs over the years and I have a few queries about it. Right now I cannot find the schematic but when I do I will get back with some questions. Anyone familiar with this unit?

author: ccktek
author_rank: Regular Contributor
timestamp: May 12, 2025, 06:12:48 pm
content: This site lists it for $5:https://www.vintagemanuals.com/manuals.php?manufacturer=B%26K&center

author: paul cotter
author_rank: Regular Contributor
timestamp: May 12, 2025, 06:34:53 pm
content: Thank you but i have both the manual and schematic, it is probably misfiled. I should have it by tomorrow.
Rohde Schwarz FSU8 RF converter - Page 1
Forum section: electronics / testgear

author: stepN.6072
author_rank: Newbie
timestamp: May 11, 2025, 05:01:40 pm
content: Hi. I'm trying to fix the R&S FSU8 spectrum analyzer. For spam Less than about 50Mhz, it stops working. I got to the YIG oscillator, I think it's fine. There must be a problem with its control. Does anyone have a schematic of the RF CONVERTER board? It's probably the same as the FSQ.
Inexpensive, decent PCB signals (+/-20V, 1-10MHz) differential probe ? - Page 1
Forum section: electronics / testgear

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: May 10, 2025, 07:50:31 pm
content: I'm looking or a differential probe for poking around PCBs - looking at waveforms across resistors, voltage across an RS485 pair, etc.+/- 20V input, 10MHz, decent noise floor. What is there on the market ?Is there a DIY solution ?

author: kripton2035
author_rank: Super Contributor
timestamp: May 10, 2025, 08:15:48 pm
content: lots of scopes have maths functions today ? why don't you substract one channel from another ?

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: May 10, 2025, 10:33:56 pm
content: Quote from: kripton2035 on May 10, 2025, 08:15:48 pm1) because the loop of the 2 oscilloscope probes introduces a ton of noise into the differential signal. Maybe I need to make a special shielded differential scope probe ?2) decoding functions built into scopes (MSO5000) can't use 2 channels or math as the source of the waveform to decode. They want the waveform on one channel.

author: bdunham7
author_rank: Super Contributor
timestamp: May 11, 2025, 12:10:13 am
content: One more characteristic you need to consider is the input impedance or circuit loading. Some differential probes designed for low voltage and very high frequencies will have a low capacitance but also a low resistance, perhaps 100k or less. I think the right inexpensive HV-type differential probe may work for you depending on what sort of noise floor you can live with. I took screenshots of a Micsig DP10013 50X probe measuring signals from an AWG composed of two 1MHz 200mV square waves with 150 degrees of phase shift. The DP was probing each center pin of the BNC output connectors. I tested with and without 20MHz BW limit and then with the leads shorted to see the noise floor. I would not recommend this probe for this purpose as a 10X version would do much better, but you can sort of see what the results might look like and you'll just have to imagine them 2X to 5X better and decide whether that would be good enough. The new "improved" DP700 might be a good place to start. Keep in mind that the common mode rejection is not great on these but they may be good enough inside your BW requirements.As far as DIY solutions, I think it gets much more difficult when you need something DC-coupled. The DP700 is $200, IDK how far you'd get on a home-grown solution for that amount of money.

author: Someone
author_rank: Super Contributor
timestamp: May 11, 2025, 12:47:36 am
content: Quote from: bdunham7 on May 11, 2025, 12:10:13 amSticking under 10MHz makes it pretty easy as you can use modern "precision" opamps:https://www.eevblog.com/forum/projects/diy-100mhz-differential-probe/?all20MHz with 1x,2x, or 4x gain is easy. Something like a THS4032, OPA2891, or OPA2828. But OP probably wants attenuation rather than gain!

author: RoV
author_rank: Regular Contributor
timestamp: May 11, 2025, 04:06:41 pm
content: Just seen:https://www.elektormagazine.com/labs/differentieller-high-speed-tastkopf-mit-ad8130
Quick Question about Fluke IR Cables (for 289 and 867B) - Page 1
Forum section: electronics / testgear

author: kblue
author_rank: Regular Contributor
timestamp: May 12, 2025, 09:14:03 am
content: Hello there!I've noticed at least 3 types of IR Cables. A PM9080 with R232, a PM9080-look-a-like (OC4USB) with, hence the name, USB connection and a IR189 Rev2. I already have the last one and it does fit the 289 but the connection feels rather weak and not so snappy. It does the job but if one gives the meter a little wiggle the adapter falls off - is this normal? It just feels like a weak physical connection.The other thing is: Does the "OC4USB" (which seems to be marked PM9080 as well in the plastics) fit with the 867B?Best wishes.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 12, 2025, 09:35:33 am
content: The first and and last one are the same except that the last one has the serial to usb converter built in. The second one won't fit the 289. I have one also and it was used on the 192 scope. I found the connection to the 289 isn't snappy but it stays on well. In fact I sometimes have problem taking it off. I have all 3 cables. I don't know which one the 867B needs. I also have the adapter so that I can use the same cable on the 189.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 13, 2025, 12:03:14 am
content: It seems that it's the PM9080 for the 867B. I have one and I don't use it as it belongs to the scope at work and I am retired now I am not going to bring that thing back for them.
DMM4040 connect to PC - Page 1
Forum section: electronics / testgear

author: Taimer81
author_rank: Regular Contributor
timestamp: May 11, 2025, 08:03:14 am
content: Hello!My DMM4040 has an LAN interface. Please tell me if it can be used to connect to a computer to monitor readings remotely. What program do I need for this?Thank you.

author: Simmed
author_rank: Frequent Contributor
timestamp: May 11, 2025, 08:51:42 am
content: the programmer manualhttps://www.google.com/search?q=dmm4040+programmer+manualim not sure if that "universal" logger in 1 of the thread can be used?https://lygte-info.dk/project/TestControllerIntro%20UK.htmlhttps://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/i think there are also some raw example python in the forum somewherehttps://www.google.com/search?q=python+scpi++logging+keithley+eevblog+site%3Awww.eevblog.com&udm=18*i have not tried the LAN stuff

author: Taimer81
author_rank: Regular Contributor
timestamp: May 11, 2025, 09:04:48 am
content: Quote from: Simmed on May 11, 2025, 08:51:42 amHello! I have read, but have not found any references to a program running over a LAN port. (

author: Taimer81
author_rank: Regular Contributor
timestamp: May 11, 2025, 09:27:08 am
content: I figured it out. I asked you to add the DMM4040 device to the list of supported ones. Thank you.https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/msg5910848/#msg5910848

author: Simmed
author_rank: Frequent Contributor
timestamp: May 11, 2025, 09:31:05 am
content: Quote from: Taimer81 on May 11, 2025, 09:27:08 amnot meits mr HKJ

author: HKJ
author_rank: Super Contributor
timestamp: May 11, 2025, 11:49:17 am
content: And Taimer81 got it working on TestController.

author: coromonadalix
author_rank: Super Contributor
timestamp: May 11, 2025, 01:23:32 pm
content: should be easy since its the same an an fluke 8845 8846 series
Is there a way to decode a waveform from the math of 2 waveforms on MSO5000 ? - Page 1
Forum section: electronics / testgear

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: May 10, 2025, 10:37:34 pm
content: Let's say I want to decode an RS485 signal with an MSO5000.Is there a way do take RS485+ on one channel and subtrace RS485- on another channel and feed that as a source to the decoder built into the scope ? Or with CAN bus signals ?

author: nctnico
author_rank: Super Contributor
timestamp: May 10, 2025, 11:00:11 pm
content: The usual way is to just use one signal. The decoder will work just fine.
T100 1X/10X/100X Oszilloskop-Differentialsonde - Page 1
Forum section: electronics / testgear

author: Kurt_!
author_rank: Regular Contributor
timestamp: November 30, 2024, 05:04:31 pm
content: Has anyone bought this oscilloscope amplifier?What do you think of it?

author: cte
author_rank: Regular Contributor
timestamp: December 01, 2024, 02:59:24 pm
content: https://www.alibaba.com/product-detail/T100-Differential-Probe-1X-10X-100X_60816853012.htmlQuote from: Kurt_! on November 30, 2024, 05:04:31 pmAvoid.

author: LinuxGuy123
author_rank: Regular Contributor
timestamp: May 10, 2025, 06:23:29 pm
content: Thanks for doing this review and sharing your results.I'm looking for a cheap differential probe. I don't need high bandwidth or high voltage or a low noise floor. I'll primarily use it to feed RS485 signals into an MSO5000 for decoding. Also for snooping around PCBs, checking for differential signals across various things.Thoughts on using it for this application ?Is there something better out there, for cheap ?

author: cte
author_rank: Regular Contributor
timestamp: May 10, 2025, 07:16:46 pm
content: For the T100 there is a review thread here:https://www.eevblog.com/forum/testgear/cheap-chinese-oscilloscope-preamp-tear-downreview-is-it-any-good/I don't own this device, but after reading the thread, I wouldn't recommend this to anyone. It might work for you, but I think it's too pricey for what is offered.Personally, I use a Micsig DP10013, mostly for checking mains powered stuff, but overpowered for your use case.
Looking for complete Amber 5500 manual - Page 1
Forum section: electronics / testgear

author: mbrando
author_rank: Newbie
timestamp: May 10, 2025, 06:30:18 pm
content: Hello,I recent picked up an Amber 5500 and was looking for a complete manual. There are some sections on archive.org, however, I was hoping someone here may have a complete manual they could share.Thanks,Mike
Ideal 61-342 temperature probe - Page 1
Forum section: electronics / testgear

author: Wishywashy
author_rank: Newbie
timestamp: May 12, 2025, 03:45:04 am
content: Hello.I am looking for a temp probe for my 61-342 meter. Either a new one or a compatible one. I use this while troubleshooting my ac/Hvac, and it always worked in the past, now it doesnt(obviously). I’ve been searching google and amazon with no results. Do any of you have any suggestions where to find one of these? Please and thank you.

author: bdunham7
author_rank: Super Contributor
timestamp: May 12, 2025, 04:45:48 am
content: Your meter takes common Type K thermocouples but with banana plugs not the standard Type K mini connector. You can get thermocouples with banana plug ends but they're less common.The best thing to do IMO is to buy a Type K mini to sheathed banana adapter an then buy a variety of regular mini K-type thermocouples. I recently bought these on AliExpress (pre-tariff) and they work nicely, unfortunately those listings have disappeared and they're more expensive here on eBay. Still worth having, IMO.https://www.ebay.com/itm/315775276319You can get some pretty nice and inexpensive Type-K probes as well:https://www.aliexpress.us/item/1005006912961975.html
HP 8673A Message Codes / Pullout Card - Page 1
Forum section: electronics / testgear

author: benj38
author_rank: Frequent Contributor
timestamp: May 09, 2025, 12:38:53 pm
content: The HP 8673A operating and service manual keeps referring to the pullout card the instrument should have at the bottom for the meaning of the different 2-digit message codes. Unfortunately, my instrument does not have this card.If anyone is willing to share an image of this pullout card I would be much obliged.
Tektronix P6248 Mini Teardown - Page 1
Forum section: electronics / testgear

author: gamalot
author_rank: Super Contributor
timestamp: October 01, 2024, 08:48:58 am
content: Sorry no high resolution pitctures this time.

author: gamalot
author_rank: Super Contributor
timestamp: October 01, 2024, 08:50:17 am
content: I found a strange thing, there are two EEPROM chips (24C02) on top side and bottom side of the PCB, why is it like this?

author: MarkL
author_rank: Unknown
timestamp: October 01, 2024, 01:11:24 pm
content: Quote from: gamalot on October 01, 2024, 08:50:17 amJust a guess, but maybe one responds when /10 mode is selected, and the other when in /1 mode. Some probing on the two EEPROMs and what comes out of the TekProbe II connector could confirm.

author: Smokey
author_rank: Super Contributor
timestamp: May 03, 2025, 05:58:28 am
content: As a proud new member of the P6248 owners club, I have a question..What do you guys use for tips? The legit ones are silly expensive, especially the "tip saver".

author: MarkL
author_rank: Unknown
timestamp: May 03, 2025, 02:13:33 pm
content: It's not the answer you want to hear, but I bought my 2x P6248 with the accessories. So I'm using the legit tips.The most useful tip is the "TwinTip" offset needle 016-1786-00. Followed by the "Longhorn" twin tip 016-1780-00. At least for my purposes. And for probing where lead length is not a major issue, the 196-3434-00 "Y-Lead" adapter is useful. The tip saver is a good idea if you use the probe often, but is optional if you're gentle with your probing.If it helps, the diameter of the needle tips is exactly 0.025". You might be able to find some gold plated needles and bend them into the shape you want. You'll probably also want to provide some additional support like the original. Although it might be tempting, don't try to make needle probes out of 0.025 *square* posts. It will ruin the contacts in the probe if the square post tries to rotate in the probe socket. (Guess how I know...)You can make a "Y-Lead" adapter with a piece of 2x1 regular 0.1" header. Square pins is ok here since they won't rotate.

author: Smokey
author_rank: Super Contributor
timestamp: May 04, 2025, 12:42:11 am
content: Quote from: MarkL on May 03, 2025, 02:13:33 pmthanks. What are your options if the probe sockets get damaged? is that repairable?

author: Protegimus
author_rank: Contributor
timestamp: May 04, 2025, 09:24:21 am
content: @gamalot thanks for this. Was your probe faulty, or did you strip it for interest?I bought a secondhand probe earlier in the year and the first one received was faulty. Think I'll open it up and take a look.Any tips on disassembly, or is it straightforward?

author: MarkL
author_rank: Unknown
timestamp: May 08, 2025, 01:47:21 pm
content: Quote from: Smokey on May 04, 2025, 12:42:11 amIt's probably repairable, if a replacement can be found for the contact or the leaf can be bent back into shape, but I haven't opened the one where this happened to know for sure. The regular probe accessories are now very loose on the "+" side, but they still stay in when inserted (barely), so I haven't risked disassembling it.
New handheld scope/DMM/SG, Holdpeak HP-50M, 2ch, 50MHz/280MSps (May 2025) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: May 08, 2025, 09:22:29 pm
content: - 2 channels- claimed bandwidth 50MHz, 280MSps- 20mV/div-10V/div- 10ns/div-20s/div- record length up to 128kbyte- signal generator, 1Hz-2MHz, 0.1-3V- DMM, 6000 count- 3.5" screen, 320*240- 19x10.5x5.3cmPrice on aliexpress $US116 (plus US$237 shipping):https://www.aliexpress.com/i/1005008433258743.htmlAnother shop lists it at US$358:https://www.aliexpress.com/item/1005008360025110.htmlAt that price it is seriously uncompetitive.And Holdpeak's homepage shows it having bandwidth 250kHz and 2.5MSps:https://www.holdpeak.com/product/441.htmlShort intro video:https://youtu.be/JvdjVWKhQ94
gwinstek gds-2062 - Page 1
Forum section: electronics / testgear

author: matty100
author_rank: Newbie
timestamp: May 05, 2025, 06:46:05 pm
content: gwinstek gds-2062I recently picked up of of these scopes as NOSEverything seems ok, but I have some issues concerning noise and noise pickup.The traces all have a noticable level of noise, regardless of the input signal.If i switch to the 2mV range, I have almost 2mVp-p of noise with the input O/C, shorted or with probe shorted.I also noticed noise pickup as my hand goes near the controls to make an adjustment.No info on the net about this scope, I am wondering if this is how they are or if there are any mods possible?

author: EvgenyG
author_rank: Regular Contributor
timestamp: May 06, 2025, 12:41:39 am
content: Hi, matty100 and welcome to the forum!Most likely PSU voltage ripple. I suggest checking power supply capacitors, could be drying up and ESR becoming out of spec causing voltage ripple on power rails.

author: matty100
author_rank: Newbie
timestamp: May 06, 2025, 06:35:38 pm
content: The scope is probably 10-15 years old, could caps go bad so quick?It looks basically unused - can that have the same effect on the caps?

author: EvgenyG
author_rank: Regular Contributor
timestamp: May 07, 2025, 01:29:23 am
content: Depends on what they put at the factory, probably something like crapXcon. I recently recapped a TDS210, it had Chemicons and that it made a huge difference on the trace. It had noticeable noise before recapping. Perhaps try checking all voltages/ripple noise and then connect a bench PSU and see if that makes a difference.

author: matty100
author_rank: Newbie
timestamp: May 08, 2025, 06:23:38 pm
content: OK, thanks for the suggestions. First, I will read up on SMPS.