hybridfree/eevblog-posts huggingface dataset:
kikusui 183 millivoltmeter schematic - Page 1
Forum section: electronics / testgear

author: HendoNZ
author_rank: Contributor
timestamp: March 26, 2021, 05:20:43 am
content: Hi all,Does anyone know where I could find a schematic for a kikusui 183 millivoltmeter?I've got the operation manual from the Kikiusui website - the calibration section references a number of adjustment points and where to take measurements from. But the boards don't have any corresponding markings.Cheers

author: coromonadalix
author_rank: Super Contributor
timestamp: March 26, 2021, 10:05:58 am
content: send an email at kikusui under an NDA (non diclosure agreement) maybe they will share it, they did in the past for my PAD series psu

author: HendoNZ
author_rank: Contributor
timestamp: March 26, 2021, 07:05:00 pm
content: Thanks, will give that a try then.Cheers
Sencore LC103 calibration - Page 1
Forum section: electronics / testgear

author: lotsapins
author_rank: Newbie
timestamp: March 26, 2021, 12:57:30 pm
content: This may have been asked several time before, but I'm new here, so here goes. I have a LC103 Cap tester in need of calibration. Where can it be sent for this service. Sencore has never responded to any of my requests for info.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 26, 2021, 02:23:28 pm
content: search on lc102 threads, it need parts to calaibraite against it, but it was never fully disclosed ....
Fluke 37 Missing the bottom stand - Does anyone have one they would part with? - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: March 24, 2021, 11:36:00 pm
content: Does anyone have the bench stand for the Fluke 37? I bought one that is missing that part.Thanks,SamW3OHMLocated in the USA

author: modz786
author_rank: Regular Contributor
timestamp: March 26, 2021, 06:15:24 am
content: perhaps if you also ask that someone might 3D print a replacement for a few beers might work

author: scopeman
author_rank: Frequent Contributor
timestamp: March 26, 2021, 02:17:44 pm
content: Yes but I would need a dimensional drawing start with and I don't even have that.Thanks,SamW3OHM
Siglent SVA1032X VNA mode: BW and sweep time are grayed - Page 1
Forum section: electronics / testgear

author: RoV
author_rank: Regular Contributor
timestamp: March 28, 2021, 01:55:56 pm
content: Hi,I am doing some measurements with an upgraded SSA3012X Plus in VNA mode.When trying to measure the impedance of a 14 MHz XTAL on port 1 around resonance, I have found a very anomalous response(see figure), although the instrument was correctly calibrated. The real series resonance is at a much lower resistance (a few ohms) and there is a parallel resonance around 15 kHz above the other: even a NanoVNA can show it.My hypothesis is that the sweep time is too fast, but I can't change it, because the relevant setting is always grayed. I have tried with the BW setting (a lower value would force a slower sweep), but it is also grayed and fixed at 10 kHz!I have tried other measurement setups (e.g. full-span, preset, S21 instead of S11, ...), but in VNA mode BW and sweep time are always grayed, both from the VNA stimulus page and pressing the BW/sweep buttons.The manual refers to those commands as normally usable, only saying that the default BW is 10 kHz.
DOA New Bryman BM235 Multimeter - Ghost screen?? - Page 1
Forum section: electronics / testgear

author: modz786
author_rank: Regular Contributor
timestamp: March 24, 2021, 04:42:14 pm
content: I just took delivery of Bryman 235 and got that sunken feeling when I noticed this ghosting of some LCD segments on the screen.I fitted the batteries, checked 1.61volts but no life at all.The screen had changed and prior to fitting battery's I managed to get a photo but with reflections it was difficult to capture.I removed battery's after a while and checked fuse. OK, so I emailed the supplier welectron.com.Later in the day I fitted batteries again and it switched on with no trace of this fault.As it appears to be working the supplier informs me that a return is accepted but I have to pay the shipping cost.Clearly there appears to be an intermittent fault that has vanished but only to perhaps reappear again probably as Murphys Law the following day after the return acceptance date expires.I wonder what it might be and has anyone had similar issues?
Measure microamp/milliamp current on external hardware (Nordic PPK) - Page 1
Forum section: electronics / testgear

author: hi_dyb
author_rank: Newbie
timestamp: March 24, 2021, 07:28:14 pm
content: Hi all,I'm studying at university and for my project I need a device to measure the current draw on some external hardware running at 3.3V, and the range of the current draw needs to be from the order of several microamps to several hundred milliamps. I think the uCurrent Gold would be perfect for this task as I need to capture a graph of the results, which I can easily do with my oscilloscope however I can't find one in stock anywhereI've also looked into the Nordic PPK 2 which has been recently released however can't find any of these in stock either.Because of this, I may have to purchase a Nordic PPK (V1), however am unsure on the Segger J-Link I need in order to connect it to my computer, as I don't own any Nordic development kits. I think the SEGGER J-Link EDU Mini may work, as it has a 10-pin connector similarly to the PPKhttps://infocenter.nordicsemi.com/index.jsp?topic=%2Fug_ppk%2FUG%2Fppk%2Fppk_dut_output.htmlhowever I'd appreciate some confirmation on this as I have no experience with these J-Link adapters.Any help with the PPK setup or alternative suggestions would be much appreciated. My budget is around £100 and I'd rather not have to purchase the PPK V1 as it does not fully meet my current requirements (PPK maxing out at 70mA) and is no longer manufactured so could be outdated. Thanks

author: geggi1
author_rank: Frequent Contributor
timestamp: March 24, 2021, 10:11:13 pm
content: Depending on the required resolution you can look in to a shunt resistor and a high impedanse measuring amplifier.If you can do logaritmic measurements you can even go for a Logamp meant for RF smething like a AD8307 that goes form 0-500Mhz and have a range of -80dBm up to +10dBm as far as i rememner.If you go for a RF Logamp you will have to look at RF decupling and possible shielding.
Fluke 88V only displays Hi 2 - Page 1
Forum section: electronics / testgear

author: stanward
author_rank: Newbie
timestamp: March 24, 2021, 06:24:15 am
content: Hello,I have a Fluke 88V that used to work fine until I noticed the battery leaked. Cleaned it up, worked fine after that. Then a day later, the display will only show "Hi 2" all the time. I opened up the case again and nothing looks bad in there. What could be wrong with it?

author: J-R
author_rank: Super Contributor
timestamp: March 24, 2021, 07:39:23 am
content: The 88V will display "Hi 2" if you power it up with the "Hz %" button pressed. Perhaps the button is stuck down or the contact area is contaminated?

author: stanward
author_rank: Newbie
timestamp: March 24, 2021, 06:45:24 pm
content: Thank you for your quick response. Let me open up the meter again, as I didn't notice anything odd last night.Quote from: J-R on March 24, 2021, 07:39:23 am

author: stanward
author_rank: Newbie
timestamp: March 24, 2021, 07:00:07 pm
content: Thank you J-R! You were right! Visibly there was nothing awry with the contact pads but I used a polymer eraser to clean the contacts and any of the thru-hole vias associated with the two contact pads and the meter now works again!Thank you!Quote from: J-R on March 24, 2021, 07:39:23 am

author: J-R
author_rank: Super Contributor
timestamp: March 24, 2021, 09:06:15 pm
content: Glad to hear it's fixed!
Where to buy : Siglent SDS2202X-E  - Page 1
Forum section: electronics / testgear

author: chacha123
author_rank: Newbie
timestamp: March 23, 2021, 09:13:00 pm
content: Hi all, after many years of wanting a scope i am finally going to buy one - and have settled on the Siglent. Does anyone have any suggestions as to the best place / best price to buy from please?I can see there are some EU vendors, but now the UK is no longer part of the EU, i can imagine i will get stung for import duty + VAT ??Rigol seems to have some deals on from time to time but i haven't seen anything for Siglent.Cheers

author: tautech
author_rank: Super Contributor
timestamp: March 23, 2021, 09:20:56 pm
content: Welcome to the forum.There are 3 UK Siglent dealers....play them off against one another.https://www.siglenteu.com/how-to-buy/

author: Blue
author_rank: Regular Contributor
timestamp: March 23, 2021, 10:00:55 pm
content: https://www.calplus.de/keithley-dmm6500.htmlhttps://www.batronix.com/shop/oscilloscopes/Siglent-SDS2202X-E.html

author: chacha123
author_rank: Newbie
timestamp: March 24, 2021, 02:35:33 pm
content: Thanks for the info - yep; turns out the scope world is quite a competitive market. My new toy is on its way !

author: Doddy883
author_rank: Contributor
timestamp: March 24, 2021, 08:52:59 pm
content: Though I fear I may be too late... Telonic deal in Siglent (and loads of other brands) in the UK. I got my Brymen from them - very quick, and cheap compared to the EU alternatives on offer at the timeDoddy
Need help with Nicolet 4094 Oscilloscope - Page 1
Forum section: electronics / testgear

author: chill4
author_rank: Newbie
timestamp: January 13, 2021, 06:35:23 pm
content: I am trying to resurrect a 1987 Nicolet 4094B digital oscilloscope with a 4175 plug-in in the 1st (left) bay and a 4570 in the 3rd (right) bay. It has been in storage for 15-20 years and worked fine before being stored. It powers up fine with a single beep and the 4094 seems to be working as it should. When both plug-ins start-up they remain in a locked state with random indicating lights on. The manual addresses this state and indicates that it is associated with the storage of settings from previous operations that somehow leaves it in this error state. The reset is accomplished by powering off and then powering back on while simultaneously depressing the 4 delay buttons on the plug-in. I have tried this countless times with no success. I have disconnected the plug-ins and even removed them from the chassis thinking it might erase any memory but no luck. I have searched the web and this forum with no success.I am not well educated/experienced with electronics so I apologize in advance for my lack of understanding a highly technical response. Any suggestions are appreciated.

author: dc8frate
author_rank: Newbie
timestamp: January 17, 2021, 02:54:09 pm
content: Hello chill4, Have you tried a power on without the plug ins connected?

author: chill4
author_rank: Newbie
timestamp: January 26, 2021, 03:30:00 pm
content: Hi dc8frate,I don't think I did. I pulled each plug-in and powered up with the other plug-in installed but I don't think I tried powering up the 4094 without either plug-in installed. I'll give it a try. Thanks.PS. I am new to the forum. Did I post this in the right place? Also, sorry I didn't reply sooner. I did not know you replied, thinking I'd get an auto email when someone did. Thanks again.

author: chill4
author_rank: Newbie
timestamp: January 27, 2021, 03:19:52 pm
content: I disconnected both plug-ins and then powered up the scope. Put them back in both singularly and together. Still the same problem in each scenario.

author: donlisms
author_rank: Frequent Contributor
timestamp: March 24, 2021, 08:50:05 am
content: I don't know if this will help you, but if you search for "Nicolet 4904 operation manual", you will find the 4094 manual -- and yes, the model number is wrong on the website. Joe seems to have collected quite a bit of historical data on this and other fun things, and programs that will run on it, and so on and so forth.My only other comment is that... generally speaking, with older equipment, it's very often the capacitors that go bad, and power rails and such go bad internally, and things stop working in various ways. I suppose just sitting there long enough could put it over the edge. The fix is often pretty easy, for those with the intestinal fortitude -- replace the bad capacitors.
HP/Agilent 8648C questions - Page 1
Forum section: electronics / testgear

author: mmaseda
author_rank: Contributor
timestamp: April 08, 2018, 08:24:59 pm
content: Anyone in the forum have any repair/calibration experience with the 8648C signal generator? I'm looking for someone to ask a few questions.Thanks,Manuel Tampa, Florida USA

author: scopeman
author_rank: Frequent Contributor
timestamp: April 08, 2018, 10:08:52 pm
content: Hi Manuel,I have fixed a couple of these but I can tell you that AFAIK detailed service manuals do not exist. The division that mad them was closed down before anyone thought of archiving the CLIPS. Maybe a former HP/Agilent employee may have them but thus far none have turned up. If one ever shows up I would certainly want one. I have the C and D version of this generator.Just ask away and I hope I can help you.Sam

author: UA3BL
author_rank: Newbie
timestamp: June 03, 2020, 02:26:05 pm
content: Could anyone say what inside 1GG3 4202 is. I think something went wrong with it and it needs to be replaced. It's in A10 Part and there is no CLIP for 8648C. I have CLIPS for 8640,8642,8643,8657,8662.

author: ytsejam
author_rank: Contributor
timestamp: March 24, 2021, 05:47:22 am
content: Quote from: UA3BL on June 03, 2020, 02:26:05 pm1GG3-4202 is RF amplifier. Spec is unknown, but should be able to support up to 4 GHz.

author: UA3BL
author_rank: Newbie
timestamp: March 24, 2021, 06:26:45 am
content: Thanks to everybody for your help. I've bought that GG1 from ALI and replaced the old one. Fortunately everything is OKThere wasn't any feedback from this unit. That's why the shape of the output signal had been distorted.
10MHz BG7TBL Distribution Amp Self-Oscillation - Page 1
Forum section: electronics / testgear

author: jjoonathan
author_rank: Frequent Contributor
timestamp: March 24, 2021, 01:20:34 am
content: If you buy the version of the 8x 10MHz BG7TBL distribution amp that lacks the internal OCXO, you might want to bodge out L1. It powers the amplifier (comparator?) that normally buffers the OCXO output but without an OCXO it can self-oscillate and the self-oscillation can modulate onto the 10MHz output. Your instruments will handle this with varying degrees of grace, creating a state of affairs that might be tricky to track down.Details in picture form: attachedDetails in video form:
Advantest R3267 an RF microwave MMIC - Page 1
Forum section: electronics / testgear

author: ZY.Huang
author_rank: Newbie
timestamp: March 06, 2021, 08:42:05 am
content: Hi, everyone:Does anyone know the specific parameters and models of the RF microwave cross device in the attached picture?Its silk screen mark is 2i, a ceramic cross device, SMT86 Package that it is applied to the RF module of Advantech R3267 spectrum analyzerI posted a request in other sections but no one respondedAnyone have any suggestions?

author: TurboTom
author_rank: Super Contributor
timestamp: March 06, 2021, 09:22:01 am
content: NEC 2SC3604.

author: ZY.Huang
author_rank: Newbie
timestamp: March 23, 2021, 02:04:43 pm
content: I carefully check the circuit parameters, yes, NEC 2SC3604 is the correct model, Thank you ! TurboTom

author: jjoonathan
author_rank: Frequent Contributor
timestamp: March 23, 2021, 04:09:59 pm
content: How the...
Over Load (OL) - Page 1
Forum section: electronics / testgear

author: AirScooter
author_rank: Contributor
timestamp: March 19, 2021, 07:31:21 pm
content: My 8000A Fluke bench meter is outputting +19.99 in every OHM's range with nothing across the leads.What is generally responsible for this behavior.ThanksDave Lowa

author: Gyro
author_rank: Super Contributor
timestamp: March 19, 2021, 07:47:44 pm
content: Please don't double post. It wastes peoples time and makes you unpopular with the Mods...https://www.eevblog.com/forum/repair/fluke-8000a/

author: AirScooter
author_rank: Contributor
timestamp: March 22, 2021, 12:12:50 pm
content: Sorry ... I wasn't sure my first post made it through the system.Is is appropriate to post the same basic question in different topics? Pretty new to this board and never operated in a board with the scope of this one.

author: Gyro
author_rank: Super Contributor
timestamp: March 22, 2021, 12:35:52 pm
content: It's always a bit tricky understanding a new forum's etiquette.No, it is generally frowned upon. The reason is quite reasonable, people take time responding to one thread, only to find that other people have responded with duplicate information in the other thread, it just gets frustrating when people have limited time here. It does mean that picking which section to post in is quite important - as you were thinking that there was a problem with your meter, 'Repair' was a good choice. If you do get it badly wrong, you can use the 'Report to Moderator' on your own post and politely ask a Mod to move it to another section. That way, the existing replies go with it.Picking a nice descriptive thread title is also a good way of grabbing the right attention. As the OP, you (and only you) have the option of going back to your first post and editing the thread title.
SRS PS365 RS-232 communication - Page 1
Forum section: electronics / testgear

author: DandaEEMan13
author_rank: Newbie
timestamp: March 22, 2021, 09:17:45 pm
content: Hello,I am trying to communicate with an SRS PS365 remotely using a computer. From what I read in the manual, it can communicate through RS-232, so I figured I can try and create a python program (using pyserial) to communicate with it.I am currently able to see the USB-to-RS-232 chipset that is integrated into the cable I am using through the device manager. I am able to open and close the port through the python program, although that helps me little. Outside of that, when I try to use PuTTY to communicate with it as well, the terminal pops up and just sits there loading. SRS said I am on my own and they don't really offer support in trying to figure this out. Any help would be super appreciated!Thanks,Dan

author: Tjuurko
author_rank: Regular Contributor
timestamp: March 23, 2021, 08:32:22 am
content: "USB-to-RS-232 chipset" must be configured to 9600 8N1."USB-to-RS-232 chipset"should workwith RS-232 signal levels: ±5V...±15V, not 0...5VAfter opening the port in the program PuTTY, you can try to send *IDN?
R&S SMIQ 02B / 03B are any good for an Ham operator ? - Page 1
Forum section: electronics / testgear

author: ytterligare
author_rank: Regular Contributor
timestamp: March 21, 2021, 08:13:33 pm
content: Hello three, hunting for a RF gen between 1-2K €.Are the devices in the subject any good ? Anything one should know before getting one ? ( known defect or weakness)...the main use would be in the analog domain.Thank youA.
Ultrascope scope software for teaching?  Or just use a video camera?  - Page 1
Forum section: electronics / testgear

author: DougSpindler
author_rank: Super Contributor
timestamp: March 21, 2021, 08:09:31 pm
content: Opinions on using UltraScope software to display scope images on video projector for classroom audience. I'm giving a one day workshop to a group of high school students and am wondering what the best way to display a larger image of what's on the Rigol scope screen for all to see? (DS-1054Z) In Dave's video reviewing UltraScope he wasn't that impressed with the performance. I'm wondering if it's been improved since Dave's review? Or should I just use a video camera pointed at the scope screen?Thanks

author: Fungus
author_rank: Super Contributor
timestamp: March 21, 2021, 09:53:27 pm
content: It's easy to try for yourself but when it's going to be slow updates (2-3 per second). Better to use a camera.

author: Microdoser
author_rank: Frequent Contributor
timestamp: March 21, 2021, 10:22:17 pm
content: I tried using the software fairly recently and found it to be rather clunky and far less informative than the screen on the scope. It probably has some use for saving screenshots of captured data but for a live demonstration for students my personal preference would be a camera pointed at the screen if you can get a steady, glare free image.

author: JohnnyMalaria
author_rank: Super Contributor
timestamp: March 21, 2021, 10:57:34 pm
content: I'd use a camera. That way you can point at the display and everyone can see what you're pointing at

author: DaJMasta
author_rank: Super Contributor
timestamp: March 21, 2021, 11:58:37 pm
content: Do you have another scope you could borrow for it? Anything with a video output would be the perfect choice for this sort of thing, but something with a good web interface or a USB based scope directly into a PC would all be very good options - just trickier when the scope is lacking the output hardware to make it really straightforward.EDIT: Maybe third party software? A few are mentioned here:https://www.eevblog.com/forum/beginners/rigol-ds1054z-is-there-any-open-source-software/

author: DougSpindler
author_rank: Super Contributor
timestamp: March 22, 2021, 12:44:06 am
content: Thanks everyone. You just saved me a lot of time, very much appreciated. Sounds like Dave's review is still spot on.My thought is it use an iPad pointed at the Rigol scope and mirroring the iPad screen to a Amazon Fire Stick with Airscreen.Or does anyone have a better idea?
HP8657A Not working - Looking for help and a good quality service manual - Page 1
Forum section: electronics / testgear

author: marcopolo
author_rank: Regular Contributor
timestamp: March 17, 2021, 04:37:56 pm
content: Hi,One of my friends has a not working HP8657A RF generator.The problem is similar to the one described here:https://www.antiqueradios.com/forums/viewtopic.php?f=8&t=2540161/ Is this kind of problem known?2/ Does anyone have a good quality Service Manual? The one available on the internet is horrible.Thanks,Marc

author: marcopolo
author_rank: Regular Contributor
timestamp: March 18, 2021, 03:20:53 pm
content: Anyone?Surprising that this Service Manual is so difficult to find

author: bdunham7
author_rank: Super Contributor
timestamp: March 18, 2021, 03:46:36 pm
content: https://www.keysight.com/zz/en/assets/9018-05479/service-manuals/9018-05479.pdf?success=truehttps://www.keysight.com/zz/en/assets/9018-05378/user-manuals/9018-05378.pdf?success=trueYou need both manuals together.How are you setting up the oscilloscope to see that pattern?Can you connect the scope to the clock out BNC and see what is there?

author: marcopolo
author_rank: Regular Contributor
timestamp: March 18, 2021, 05:51:12 pm
content: As said before, the service manual is of poor quality.It isn't my setup but the setup from one guy who had the same problem 12 years ago.The 10Mhz reference output (Opt. 001) is a clean sinus.On Saturday, with the owner of the generator, we're going to do some measurements to try to understand what's going on.

author: bdunham7
author_rank: Super Contributor
timestamp: March 18, 2021, 06:05:09 pm
content: Quote from: marcopolo on March 18, 2021, 05:51:12 pmOK, I've worked with worse. I don't know of any free ones that are better. If you are willing to pay a nominal sum, these guys have a version that may be clearer. You need both volumes for $12.50 USD.http://artekmanuals.com/manuals/hp-manuals/

author: marcopolo
author_rank: Regular Contributor
timestamp: March 20, 2021, 09:22:08 pm
content: We did some measurements: 800 Mhz on TP3 is missingWhy?Because the generator was used with option 022 (GMSK modulator), so we have to make a bridge between the 800Mhz output and inputAnd now it works fineHP8657 with Opt. 022
MARCONI 2440 MICROWAVE COUNTER (service manual) - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: June 13, 2014, 02:26:30 pm
content: I got a Marconi 2440 with bad channel A and need schematic.I will have a lot of work on this unit since it is in bad cosmetic condition.Any help sharing your experience with this unit is welcome.eurofox

author: eurofox
author_rank: Unknown
timestamp: June 15, 2014, 02:11:43 pm
content: I bought the documentation and fix it.Now some painting work on the enclosure and front plateeurofox

author: jemp
author_rank: Contributor
timestamp: March 20, 2021, 03:18:11 pm
content: Hello Foxdo you have any adjustment procedure of this counterIt is a bit unsensitive a C rangeTnxJP, also Belgium
Where to get this kind of test probe? - Page 1
Forum section: electronics / testgear

author: e100
author_rank: Frequent Contributor
timestamp: March 21, 2021, 11:46:32 am
content: I tried a Google reverse image search but it just gives pictures of the insulation piecing type.I particularly want the serrated jaws as they are much better at grabbing that the classic spring crossover types that can loose grip if they get twisted slightly.

author: Noy
author_rank: Frequent Contributor
timestamp: March 21, 2021, 12:09:18 pm
content: Hirschmann

author: e100
author_rank: Frequent Contributor
timestamp: March 21, 2021, 12:17:19 pm
content: Quote from: Noy on March 21, 2021, 12:09:18 pmThanksThey are called "Crocodile Action Probes (4mm)"
HP 8657A off freq - Page 1
Forum section: electronics / testgear

author: steele
author_rank: Newbie
timestamp: March 11, 2021, 03:47:51 pm
content: HP 8657A off freq, just purchased of of flebay was supposed to be calibratedTo show 27.20500 on the spectrum analyzer peak center marker, I have to have the 8657A set to 27.20491I have not found the internal adjustment on the 8657A to set the frequency properly on the 2 so called service manuals I downloaded.Any info would be appreciated(the equipment was also running for over 9 hours)Thanks

author: Grandchuck
author_rank: Super Contributor
timestamp: March 11, 2021, 05:33:37 pm
content: I suggest a frequency counter to be sure.

author: bob91343
author_rank: Super Contributor
timestamp: March 11, 2021, 05:54:56 pm
content: I have an 8657B with the high stability option. The frequency calibration is accessible via two holes in the add-on module on top, the one at the rear of the generator.Read the manual. It's in there.If you don't have the high stability oven, I can't help directly. In any case, there is a warmup time necessary before full stability is achieved. For mine, it's about 45 minutes, since while the oven is always plugged in, the oscillator isn't and so there is some drift.

author: bdunham7
author_rank: Super Contributor
timestamp: March 11, 2021, 06:05:52 pm
content: Quote from: steele on March 11, 2021, 03:47:51 pmDoes it have Option 001?

author: steele
author_rank: Newbie
timestamp: March 11, 2021, 10:17:02 pm
content: This is what I have now after letting it run all day

author: Ray Gianelli
author_rank: Contributor
timestamp: March 19, 2021, 10:04:21 am
content: It's not in the service manual, but you will find it in the Operation and Calibration manual, PDF page 229. Time base adjustment is A3R22.
A cheap LCD conversion for the HP E8285A - Page 1
Forum section: electronics / testgear

author: tabajaralabs
author_rank: Regular Contributor
timestamp: March 19, 2021, 04:07:32 am
content: https://tabajara-labs.blogspot.com/2021/03/finalmente-eu-consegui-lcd-no-e8285a.htmlYou can use google translator, it is your friend =)How to put a cheap chinese LCD in place of the plasma display of the E8285A. Of course, it works for anything with a composite video inputHope that it helps!!! Please leave a message if you like this73 de PU2SEX Alexandre
HELP: LWLA1034 logic analyzer software needed - Page 1
Forum section: electronics / testgear

author: zenxyzzy
author_rank: Newbie
timestamp: March 18, 2021, 11:20:40 pm
content: I,have a LWLA1034 and can't find the CDROM that came with it. it is pretty capable analyzer, if a bit old.supposedly, the newest manufacturer software works well.I have sigrok and pulseview for it, and it seems to be more limited than the original software. anybody have a copy or a download link?--curt
Siglent SDS1104x-e wobbly encoders - Page 1
Forum section: electronics / testgear

author: derree
author_rank: Contributor
timestamp: March 17, 2021, 05:35:19 pm
content: Hi everybody.I got myself a new SDS1104x-e, which is a nice powerful scope in my opinion.Coming from a Rigol DS1052e, I find the encoders on the siglent to be on the wobbly side, especiallythe encoders with plastic shaft (and the smaller encoder knobs).The encoders with detents and bigger knobs for the vertical and horizontal divisions have much less play in them, but stillmuch more than on my old scope.I want to keep this machine, as I like it otherwise, but the encoders don´t give me the impression of a quality product, andI am a little bit afraid that they will break sooner than later.Are there any reports of the encoders to be a weak point of these scopes? I only found a thread of another siglent scope series (SDS2202X-E),with tautech mentioning that there are no reports mentioning problematic encoders.

author: tautech
author_rank: Super Contributor
timestamp: March 17, 2021, 06:18:32 pm
content: Quote from: derree on March 17, 2021, 05:35:19 pmI still stand by that.Just use it and the encoders will not give you any trouble.There are many owners of these scopes on this forum now and if there were problems we would know about them.

author: derree
author_rank: Contributor
timestamp: March 17, 2021, 06:36:36 pm
content: Hello tautech,Thank you for the fast reply, which gives me more confidence in just using it.
85645 Band 3 not showing - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: March 18, 2021, 02:53:39 pm
content: Hello,I have something that puzzles me here I have a 8563EC and 85645A for some reason the band 3 is showing up while tracking.The CW does work... I tried to go all the way of the calibration, still not luck.Should I just repeat until lucky or is there something else that could be an issue ?
2021 alternatives for Symmetricom TrueTime XL-DC GPSDO as 10Mhz bench standard? - Page 1
Forum section: electronics / testgear

author: bsodmike
author_rank: Regular Contributor
timestamp: March 17, 2021, 02:47:12 pm
content: Hi all,Appreciate any suggestions for the above, also I'm a newbie in this particular field but have a decent idea of what I'm looking at given that I've gone through most of Martin's coverage on this topic.Cheers!
Rigol DS1054Z PyDSA - Page 1
Forum section: electronics / testgear

author: Errmy
author_rank: Contributor
timestamp: March 17, 2021, 01:02:53 pm
content: Hello,i tried to improve and update the code from PyDSA and now i need some people who can test and/or check the code. I'm not the best at coding so please dont be too harsh.The code can be found athttps://github.com/Errmy/PyDSAand its a fork from a fork.Errmy
HP 3457A - fastest readout with python? - Page 1
Forum section: electronics / testgear

author: MiDi
author_rank: Frequent Contributor
timestamp: September 19, 2018, 08:09:14 pm
content: Has anyone experience with fast continuos readout with python from HP 3457A?Is it limited or can we get continuosly 0.005 PLCs without problem?Code examples appreciated

author: wiesl
author_rank: Contributor
timestamp: March 16, 2021, 02:29:52 pm
content: Did you find anything usefull?

author: MiDi
author_rank: Frequent Contributor
timestamp: March 16, 2021, 04:44:21 pm
content: No, in the manual are settings for fastest readouts, but seems my GPIB setup is only capable of ~5ms...

author: alm
author_rank: Super Contributor
timestamp: March 16, 2021, 08:53:29 pm
content: I gather you already disabled auto-zero etc as I imagine the manual recommends for fastest reading speed. Have you considered reading the samples in internal memory and retrieving the entire memory after filling it? Or do you need a constant sampling rate? If the 3457A has a batch read command to retrieve multiple readings in one request, then that might well if you are limited in the number of read/writes per second.
Signal generator for 2-way communications receiver testing - Page 1
Forum section: electronics / testgear

author: videobruce
author_rank: Frequent Contributor
timestamp: March 15, 2021, 09:05:40 pm
content: I'm looking for a SG to use on (mostly) communication receivers (FM) for testing sensitivity, & metering on the receiver (if so equipped).Basic FM at least.I would like to stay under $1k US, but would consider up to $1.5k.Frequency range; 140 MHz to 2.5 GHz preferred (or at least up to 900MHz).Ability to enter any specific frequency via a numeric keypad, 162.55 Mhz for example.Also the ability to vary the power level (of course).Lastly, preferably a self container unit, no PC required.I looked at models from Rigol & Siglent, but they are way out of my price range and also overkill.

author: xmo
author_rank: Regular Contributor
timestamp: March 15, 2021, 09:39:00 pm
content: If you are planning on testing two-way radios, one logical thought would be to consider a service monitor. There are a whole range of possibilities to choose from.For a strictly signal generator, since you said Rigol and Siglent are out of your price range - that suggests you are looking at new equipment.It's pretty hard to apply "affordable" and "new" to RF generators.There are a number of quality used generators that can sometimes be had within your budget. I have an Agilent ESG and a R&S SML. Both are excellent.

author: radiolistener
author_rank: Super Contributor
timestamp: March 16, 2021, 01:53:49 am
content: here is cheap Chinese RF generator, may be it will fit your needs:https://www.aliexpress.com/item/4000110927557.html

author: tautech
author_rank: Super Contributor
timestamp: March 16, 2021, 02:28:36 am
content: Quote from: videobruce on March 15, 2021, 09:05:40 pmYep even the SSG3021X is double your budget and if you need to push to 2.5 GHz it needs 'improving'.Mine works just fine to 3.2 GHz.That these have both HF and LF outputs is sometimes useful.

author: bob91343
author_rank: Super Contributor
timestamp: March 16, 2021, 05:24:18 am
content: My old HP 8657B will do the job. You can pick them up for reasonable prices but make sure you get one with the high stability option.

author: videobruce
author_rank: Frequent Contributor
timestamp: March 16, 2021, 09:52:44 am
content: Quote from: xmo on March 15, 2021, 09:39:00 pmI didn't mention 'Service Monitors' due to what I would figure the price would be way out of range.As to 'used', I figured they would mostly be the much older huge & heavy 'boat anchors' which I don't like and don't have room for.As with SA's, I figured that prices have dropped so much due to miniaturization of components, used wouldn't necessarily be a 'deal', but I will look.

author: bob91343
author_rank: Super Contributor
timestamp: March 16, 2021, 05:15:59 pm
content: On a different thread, some guy in Canada is giving away a service monitor.

author: videobruce
author_rank: Frequent Contributor
timestamp: March 16, 2021, 07:29:56 pm
content: Thanks, I think I will pass on that. (That's a classic "boat anchor")But, for now I'll try that no-name thru AliExpress
Analog Transistor checker help. - Page 1
Forum section: electronics / testgear

author: diydidi
author_rank: Contributor
timestamp: March 15, 2021, 07:05:20 pm
content: I recently acquired a Future Electronics FTC-401 transistor checker.It was made in Japan.i cant find a manual for it anywhere. There is a new company listed with the name “future Electronics “ but they know nothing of it.I have attached a photo. Anyone know anything about these units or perhaps have a manual?thank you.

author: TimFox
author_rank: Super Contributor
timestamp: March 15, 2021, 07:27:45 pm
content: No information, but it’s unfortunate that they did not include a front-panel socket for TO5 and TO18 packages (isosceles right triangle). I assume that the beta measurement is simply a current source to the base-emitter circuit and a current meter for the collector current. Is it battery operated and how much voltage do you see at the collector terminal?You might be able to find a manual for the Heathkit IT-18, which looks similar, but it’s beta and leakage scales are nonlinear. Similarly, the Sencore units have nonlinear scales.

author: archil
author_rank: Contributor
timestamp: March 16, 2021, 08:08:32 am
content: i found only one photo of this model.

author: bob91343
author_rank: Super Contributor
timestamp: March 16, 2021, 05:26:57 pm
content: Future Electronics is a US distributor of electronic parts. They probably had this made by some Asian outfit some years ago.What is it you want to know about it? It seems pretty simple.
KORAD KA3005D-3S overvolting fans ? - Page 1
Forum section: electronics / testgear

author: xani
author_rank: Frequent Contributor
timestamp: March 16, 2021, 01:17:59 pm
content: So I have that power supply (looks like 2x KA3005D glued together) and I had fan fail on me.So I tore it down, removed the fan and lo and behold it literally melted. It was just basic 12V/0.18A fan. That got me curious so I measured voltage going to it and it was... 28VSo I'm thinking, "right, probably some shoddy start circuit making sure that fan actually starts spinning".After that I've connected electronic load to it and lo and behold, still 20V at 0.5A, 18V at 1A !After that I've cut the second, barely working fan, spliced multimeter in and sure enough, 0.5A to poor tiny 12V/0.18A fan.That would certainy explain why so many people were replacing themCan anyone confirm whether newer models have that problem ?
Anritsu 2723 CFL replacement - Page 1
Forum section: electronics / testgear

author: tecman
author_rank: Frequent Contributor
timestamp: March 20, 2021, 06:40:46 pm
content: My 2723B spectrum analyzer has a CFL on the display that is on it's last legs. I purchased a couple of LED replacement kits. The new drivers are simple, easy to understand (V+, GND. Enable and Dim). However the 2723 has an Anritsu CFL driver with an 8 pin interface. Searching for any details or schematics cam up empty. I tried to ring out the existing board, but beyond basic connections I did not get too far. I tried to find a way to operate it in the unit, but the placement and the way the 2723 is assembled makes it near impossible.Does anyone have any insight as to the interface on the Anritsu driver ? I was able to ring out a few pins while powered up and several have voltages on them.Any assistance is greatly appreciated.Paul

author: drussell
author_rank: Super Contributor
timestamp: March 20, 2021, 07:28:29 pm
content: If you mean that it has one of those little tiny-diameter cold cathode florescent lamps (CCFL), you could probably just replace the tube(s).Places like Digikey stock them in a bunch of sizes... I've replaced tons of them on touchscreen POS terminal displays. There were some SHARP display panels in particular in the pre-Eclipse Micros UWS days that the tubes only lasted about 3-4 years at most at a time before you'd need to replace them, I guess the stock inverter was overdriving them? Both sizes of the active matrix panels were bad for that, while the earlier passive models lasted much, much longer (but still not indefinitely.) The ones for those terminals were about $7 ea.I still have a stash of those bulbs around here somewhere....

author: nctnico
author_rank: Super Contributor
timestamp: March 20, 2021, 09:29:20 pm
content: Quote from: tecman on March 20, 2021, 06:40:46 pmJust figure out the power connections and connect enable and dim to the power supply using 10k resistors. That way the backlight is simply always on. Oh, and if you cut the LEDs strips to length, you might want to change the current sensing resistor on the LED replacement kit otherwise it will push way too much current into the LEDs.
TMK 700B measurement depends on placement - Page 1
Forum section: electronics / testgear

author: taydin
author_rank: Frequent Contributor
timestamp: March 16, 2021, 01:04:58 pm
content: I have acquired a TMK 700B analog multimeter and have tried measuring DC voltage with it. What I'm seeing is that the measured value depends on whether the multimeter is placed horizontally or vertically on the bench. When measuring 12 V, the discrepancy is about 1 V. I don't think this is normal because the stated accuracy of this multimeter is 2%. It is also out of calibration, which I will do soon, but this problem with the alignment shouldn't be related to calibration or the accuracy.When looking at the manua of it, there isn't any requirement to use this multimeter in the upright position or vertical position, so I'm not sure what's going on with this. Anybody can give ideas?
Marconi / Aeroflex 2026Q Service Manual - Page 1
Forum section: electronics / testgear

author: 450bush
author_rank: Newbie
timestamp: March 15, 2021, 10:04:29 pm
content: Dears,I am looking for the Marconi 2026Q Service manual. The original P/N for it is 46880/087.However so far I wasn't able to find it...Any help is appreciated!Kind regards
HMO2024 glitches in SCPI data - Page 1
Forum section: electronics / testgear

author: Fabian
author_rank: Contributor
timestamp: March 05, 2021, 06:20:15 pm
content: Hi everyone,I am currently working with my (otherwise very nice) Hameg/R&S HMO2024 oscilloscope over USB/SCPI (using pyvisa) together with the logic probe HO3508. During that endeavour I stumbled accross a very strange bug/glitch. Long story short: The data I get from the SCPI interface is not the same as the data on the display! There are glitches at (some) falling edges.I attached pictures of the same (singleshot) data. The same happens with PulseView, so I guess it is not my (scripts') fault.Any ideas?

author: Fabian
author_rank: Contributor
timestamp: March 06, 2021, 10:12:41 am
content: Thanks for your reply. Can you clarify a few things?The error disappers in stop mode or does not even disapper in stop mode?What does your program do to "ignore" the error? Do you manupulate the screenshot image file? Or do you post-process the raw data and create a "screenshot" by yourself?

author: Fabian
author_rank: Contributor
timestamp: March 06, 2021, 10:43:33 am
content: Wow ok. That would be much easier in my case, as I can get the raw sampled data from the scope and don't have to use the screen dataHowever, as I am using other external tools like PulseView, it's also a bit more complex. I am not willing to write a dirty patch for sigrok to compensate this behaviour of the scope. I wrote an email to R&S asking for help. But they did not update the firmware in 5 years, so I do not have much hope to make them create a fix.Any other idea to solve or work around this problem is still welcome.

author: Fabian
author_rank: Contributor
timestamp: March 06, 2021, 11:40:55 am
content: Well, PulseView is able to apply (multiple/stacked) decoders to a signal, but I was not able to find a glitch/debounce filter. It seems like there are only decoders and no filters, not even a low pass filter. Maybe I am missing something obvious...

author: Fabian
author_rank: Contributor
timestamp: March 09, 2021, 02:22:33 pm
content: Just a short update: I got a very nice and competent reply form R&S asking for more data, screenshots, SCPI-Traces, ... which I happily provided to them. I also mentioned the HM2008.Additonally I verified that the problem only appears for time-bases larger or equal to 5us/div and it happens on every single falling edge, independent of the sample rate (i.e., even for LARGE time scales).

author: Fabian
author_rank: Contributor
timestamp: March 17, 2021, 02:23:10 pm
content: And another update: R&S will not look into the problem as they cannot find one of the scopes anywhere and it is not maintained any more, so there will be no more firmware updates anyway.
Tek Device Compatibility - Page 1
Forum section: electronics / testgear

author: L_Euler
author_rank: Regular Contributor
timestamp: February 26, 2019, 02:35:25 pm
content: Do any of you know if a Tektronix 2402A Tekmate will work with a Tek 2440M oscilloscope, the military version. The 2440M appears to have a different configuration of the GPIB port from the standard 2440.

author: Testtech
author_rank: Regular Contributor
timestamp: March 02, 2019, 12:52:29 am
content: Maybe, the 2440M MATE/CIIL instrument, when not in MATE mode, I think passes standard GPIB commands through. These, and all MATE instruments are strange animals.

author: BradC
author_rank: Super Contributor
timestamp: March 15, 2021, 01:35:48 pm
content: This is a couple of years late, but it's dead easy to unplug the GPIB from the MATE board and plug it straight into the scope. I eventually ripped the MATE board out of mine. Just needed to plug the GPIB and the LED ribbon back to the correct sockets and it's "de-MATEd".
Racal Dana 199x Processor AMCC Q710-0016 - Page 1
Forum section: electronics / testgear

author: NortliW
author_rank: Contributor
timestamp: March 07, 2020, 12:04:41 am
content: Hi All,To repair my Racal Dana 1992 counter I am in need of a parts unit of any 199x or an AMCC Q710-0016 Processor chip IC.Drop me a line if you can help. Thanks,Bas.

author: Fraser
author_rank: Super Contributor
timestamp: March 08, 2020, 12:31:47 am
content: I believe I have a Racal 1999 that suffered button switch failure. It is otherwise operational. It was taken apart by a colleague who gave up on repairing it when he saw the switches so has not been messed with. Let me know what it is worth to you as a parts donor. From memory it is missing the attenuator control as that got mislaid. I am located in the UK.I can supply pictures tomorrow.Fraser

author: eevcandies
author_rank: Regular Contributor
timestamp: March 15, 2021, 09:17:11 pm
content: You can buy the proper switches SKEGAca010 for replacement

author: coromonadalix
author_rank: Super Contributor
timestamp: March 16, 2021, 12:19:58 am
content: I have 2x complete "1992" for parts, they were functional but have the key switches problems (mostly stuck pressed)They have the original clock circuits (5mhz big osc can)I had the project to modernize them to the tcxo boards made by Dan Watson but tossed them in a closet lollI have 3x pcb's with 3x 10mhz ENE3311B oscillators
tektronix 475 - Page 1
Forum section: electronics / testgear

author: Bogden777
author_rank: Newbie
timestamp: March 15, 2021, 04:11:33 pm
content: can anyone tell me why this screen is ghosting in sections. for some reason i cant post in the repair section??

author: tautech
author_rank: Super Contributor
timestamp: March 15, 2021, 06:30:18 pm
content: Quote from: Bogden777 on March 15, 2021, 04:11:33 pmDual timebase enabled.Check for something like a A intensified by B setting.

author: Bogden777
author_rank: Newbie
timestamp: March 15, 2021, 06:45:13 pm
content: I was thinking something was wrong with the crt 😊
Fluke 177 No Power-On options - Page 1
Forum section: electronics / testgear

author: jklash1987
author_rank: Newbie
timestamp: March 13, 2021, 12:58:55 pm
content: Hi, I'm new to the blog.I Purchased a second-hand Fluke 177 from eBay recently.It was in 'ok' shape, I knew I would have to give it a light re-furb.However, I can't access any Power-On options.No matter which button combo/range switch I press/select nothing will happen.I can't access 'bEEP', PoFF, S--- or, LoFF'I can access the firmware version display, which is 2.03.4, the serial number isn't present however on the board it has 'Fluke 27X-3011 REV 015On the front of the board, it is stamped with Rev '20' and KALEX3 K688Unfortunately, this is the only info I have.All the buttons work as they should in all their ranges.After refurbing the meter (cleaning the contacts etc) everything seems functional.When switching the meter on normally, the electricity/lightning/live symbol doesn't display along with the 'F177' like my 179 does nor my co-workers 177...My Fluke 179 (which I purchased new in 2013) all the power-on options are available, I couldn't tell you the rev/firmware and etc, as I leave that meter at work (as I purchased this from new, the serial number is present also)...Could this be due to firmware/Chipset?This issue is also referenced herehttps://www.eevblog.com/forum/repair/fluke-179-76688/msg1067363/#msg1067363,but with a much older board revision and firmware.I appreciate any insight or information anyone may have.Cheers,JK

author: jklash1987
author_rank: Newbie
timestamp: March 15, 2021, 07:19:05 am
content: I’ve probably answered my own question... my 179 that I purchased back in 2013 has firmware version 2.04.5So I can only assume 2.03.4 doesn’t feature any of the power on features...Also, the 177 has ‘Made in USA’ on it, my 179 doesn’t.So age, firmware etc etc etc...Cheers,Jk