hybridfree/eevblog-posts huggingface dataset:
GWInstek OpenWave LAN Setup? - Page 1
Forum section: electronics / testgear

author: TimNJ
author_rank: Super Contributor
timestamp: May 11, 2020, 07:48:10 pm
content: Hi everyone,I'm trying to set up OpenWave remote monitoring over LAN on my GDS-2000E series oscilloscope. In my experience, these types of programs are always a pain in the butt to get working. Maybe it's easier on something from Keysight or R&S, but I've also had my fair share of woes with LAN support on Agilent equipment in my college lab.Has anyone got this to work?1. I've got my scope attached to my LAN via an 8-port switch2. I turned on DHCP and socket server on the scope menu, as per the README3. I logged into my router at 192.168.1.1. I see the oscilloscope on the network as 192.168.1.39.4. When I try to run the program from the command line, it says "No such file or directory "license.txt"", even though license.txt is in the same directory with it and I can call it from command line or opening up in explorer.5. You can also run the .exe by double-clicking on it in explorer. The program launches, appears to find the license file, but says "Device not found!" Maybe it defaults to USB connection or something.Any tips for configuring the scope? There are options to input the domain name on the scope. In the past, I've had some issues with Workgroups and domains under Windows 10 and getting everything to show up on the network.I know most people don't usually bother with LAN, but if you have, I'd love to know how you got it working.Thanks,Timhttps://github.com/OpenWave-GW/OpenWave-2KE/blob/master/README.md

author: TimNJ
author_rank: Super Contributor
timestamp: May 11, 2020, 08:19:50 pm
content: Alright, step #1, don't be a dumbass and learn some basic command prompt skills.I thought by copying the OpenWave directory into the command prompt it would automatically 'cd' (change directory) to that directory. Not the case. Also, I saved the file in the root of a separate drive, so maybe that messed it up. Have to use the /d switch to change drives, as in" cd /d D:\"Now it works...no need for domain names or anything like that, just the IP address + socket as in the README.But, with 4 channels the update speed is horrendous. It appears to be sending every data point recorded, which is usually preferred, but seems to really kill the update rate over LAN. The program basically freezes up every time it's trying to make an acquisition. Takes 5 or 10 seconds to acquire 1 channel of data. Multiple by 4 if you want all channels.I basically just wanted to check if my scope was triggered. (Trying to check for a spurious event, but don't want to sit there for hours on end.)

author: TimNJ
author_rank: Super Contributor
timestamp: May 11, 2020, 09:55:30 pm
content: Update: The update rate can be greatly improved, almost real-time update, if you switch from Raw Data mode to Image mode. In image mode, it just takes a PNG screenshot a few times a second and refreshes the GUI. Apparently it's much easier to send a PNG than 24Megapoints of 10-bit data. Who knew.
Help with resurrecting an analog scope - Page 1
Forum section: electronics / testgear

author: pitpat
author_rank: Contributor
timestamp: May 11, 2020, 04:53:07 pm
content: Hi, im not super good with english so be kind.I got for these quarantine days a cheap Hameg 103 to be restored.I'm quite new with old school tech, anyways the thing is when i first got it everything look'd ok but after a few minutes of playing with the test trace all went black (or white since we are talking about crt).The strange thing is that the component tester is working good, vertical line for short-circuit and L-shaped line for diodes.After replacing some caps that wasn't quite in specs anymore (only the few that i had laying around) in normal mode i got a dot that i can move with the x-y position knob.The big resistors of the y final amp gets really toasty.Since the component tester isolate the y-preamp board i would say that the fault can be located in there.What do you guys think?i'll leave the service manual for referencehttps://cdn.rohde-schwarz.com/hameg-archive/HM103_englisch.pdfThanks.
Analog Discovery on Steroïd - Page 1
Forum section: electronics / testgear

author: jemangedeslolos
author_rank: Frequent Contributor
timestamp: May 12, 2020, 07:13:32 pm
content: Hello,I bought few weeks ago an Analog Discovery 2 and it is a very nice little piece of instrument....I was wondering if the same concept existed but more powerfull ( more Sa/s, more BW, more chanels and more robust hardware interface )?Thank you

author: egonotto
author_rank: Super Contributor
timestamp: May 13, 2020, 02:01:31 am
content: Hello,not easy to answer.Red Pitaya has 125 MS/s but bad softwareVirtualBench All-in-One Instrument from NIUSB MSO with built in function generator. Perhaps PicoScope 6000E Serieshttps://www.youtube.com/watch?time_continue=2&v=WBSHYZHI2Zs&feature=emb_logoBest regardsegonotto

author: _Wim_
author_rank: Super Contributor
timestamp: May 16, 2020, 06:51:44 pm
content: Quote from: jemangedeslolos on May 12, 2020, 07:13:32 pmI would like one of those also, for sure if price/performance ratio remains identical. I also wish the team at picoscope would take a good look at the waveforms software package, it has many more useful features as the picoscope software. I bought an analog discovery 1.0 out of curiosity, but have used it much more as I expected.
HydraBus open source extensible multi-tool hardware/firmware - Page 1
Forum section: electronics / testgear

author: hydrabus
author_rank: Contributor
timestamp: January 19, 2015, 11:00:41 am
content: I'm the designer of HW & SW of the HydraBus and HydraNFC shieldThe HydraBus is an open source multi-tool hardware for anyone interested in learning/developping/debugging/hacking basic or advanced embedded hardware.The HydraNFC is an NFC shield hardware (to be plugged on top of HydraBus) to sniff, read/write or emulate any 13.56MHz NFC tags for anyone interested in debugging/hacking/developing for NFC.The Official open source firmware for HydraBus/HydraNFC is available on GitHubhttp://github.com/bvernoux/hydrafwHydraBus github:https://github.com/bvernoux/hydrabusAlso the schematic and board in Eagle format are available for HydraBus and HydraNFC+Antenna on GitHub:https://github.com/bvernoux/hydrabus/tree/master/hardwarehttps://github.com/bvernoux/hydranfc/tree/master/hardwareHydraBus hardware can be also used with alternative firmware:- Write/Execute your own embedded python 3.x scripts with the port of micropython:https://github.com/bvernoux/micropython- Debug your ARM board with JTAG/SWD debugger with port of BlackMagic Probe:https://github.com/bvernoux/blackmagicAny remarks questions or ideas (of features ...) are welcome.Developers/contributors for doc, tutorial, code ... are welcome.Note:HydraBus and HydraNFC board are available in SeeedStudiohttp://www.seeedstudio.com/depot/HydraBus-m-132.htmlHydraBus Main website:http://hydrabus.comBest RegardsBenjamin

author: jano2358
author_rank: Newbie
timestamp: April 17, 2018, 03:54:34 pm
content: know this is old, but posting is almost freeit's your project still alive? I saw the boards sold out in all the places where they seems like us to beif not, do you know any fork to other microcontroller? it will be great to port this to the discovery f746

author: hydrabus
author_rank: Contributor
timestamp: September 26, 2019, 06:45:40 am
content: Sorry I have just seen your comment nowThe boards are available herehttps://lab401.com/collections/hydrabus

author: mmzhr
author_rank: Newbie
timestamp: April 28, 2020, 12:37:29 am
content: HydraBus is great open source hardware with many functions

author: hydrabus
author_rank: Contributor
timestamp: May 12, 2020, 10:47:13 am
content: A new production of HydraBus v1.0 Rev1.4 is ready to ship (I can sell directly only with minimum 3 units) and shall be available soon to my resellers (especially if you need less than 3 units)
U1620A power supply specs - Page 1
Forum section: electronics / testgear

author: tech_builder
author_rank: Contributor
timestamp: May 09, 2020, 03:09:38 pm
content: Hi,I recently purchased an U1620A portable oscilloscope from Keysight's eBay store; however, it does not come with a power supply. It is listed as being 15V 4A, but I can't find any info about the barrel jack. The specified one is very expensive and does not seem to be in stock anyways.I am looking for the barrel jack outer and inner diameter, as well as the polarity (ie center negative).Thank you

author: threephase
author_rank: Regular Contributor
timestamp: May 09, 2020, 04:56:49 pm
content: I have the U1602B and the PSU jack on it is an odd ball. Whilst it is a standard 2.1mm DC jack in terms of diameters, it has an extended sleeve as per the attached. The PSU rating for mine is not the same as yours, it is 12V at 2A.It is centre pin positive and overall length is 70mm. I have in the past been able to use a 2.1mm rewireable DC jack without the plastic cover and it will fit.No guarantee it is the same, but may be of help.Kind regards

author: maginnovision
author_rank: Super Contributor
timestamp: May 09, 2020, 05:47:58 pm
content: 1. The inside is positive but it's not a pin the pin is scope side.2. The barrel is 5.5 x 2.1 and 22mm in length, which is required(Roughly 50% insulated)PPM-2-5521L-S from CUI might work

author: TheSteve
author_rank: Unknown
timestamp: May 09, 2020, 09:08:18 pm
content: Quote from: blueskull on May 09, 2020, 03:14:00 pmIt uses the same battery as a FieldFox but the adapter is technically different. The scope uses the really long "safety" version of a 2.1mm jack. It is positive center. The older FieldFox adapter will plug in and just barely work to power the scope. The newer version of the FieldFox power adapter will no longer plug in at all. The older version of the FieldFox power adapter is part # 0950-5014.

author: tech_builder
author_rank: Contributor
timestamp: May 10, 2020, 11:02:46 pm
content: Thanks so much for the information! I am going to order the part maginnovision suggested and see how it goes.
UNI-T available from China only? (or ownership costs of usb handheld meters) - Page 1
Forum section: electronics / testgear

author: Mp3
author_rank: Frequent Contributor
timestamp: May 09, 2020, 02:07:04 pm
content: Really no USA vendors of UNI-T multimeters? I spent a long time last night looking for everything in Wycnuctl's awesome multimeter comparison chart, after realizing the cost of ownership inclusive of the USB connection kit puts those well below the rest.But I can't seem to find the UT70/UT71/UT171's for sale anywhere except direct from China. I'm not too keen on the UT171 line though, as part of the appeal is staying under $200If you followed my thread obsessing over auto-range speeds, i've learned my lesson and will keep a manual range meter around and will grab a decent analog meter too. (I always hated using my dad's analog meter growing up but i can't act like it's not ideal for watching certain transients.I've been going through the rest of the chart to compare ownership costs of a handheld meter with its USB connection kit, and the Brymens just above $200 dont look bad either, but then i am spending 50ish on USB alone.Please note: I know UNI-T meters are cheap and i want it for the lab bench only! That means it may not even see 120v AC ever, for anything high voltage or potentially dangerous, that's why i own my Fluke still.

author: modoran
author_rank: Regular Contributor
timestamp: May 09, 2020, 02:56:59 pm
content: TME has them and they ship to USA very fast. They are in Poland tough:https://www.tme.eu/en/katalog/p,uni-t_864/

author: Mp3
author_rank: Frequent Contributor
timestamp: May 09, 2020, 04:32:55 pm
content: Quote from: modoran on May 09, 2020, 02:56:59 pmI appreciate it. UPS express saver for just under $10 is really awesome. i saw it on google but thought shipping would be unreasonable. Appreciate it.I would have paidforthe ut171c for that sweet OLED screen, but don't even see that from china...

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: May 09, 2020, 07:34:51 pm
content: https://www.aliexpress.com/item/32831433416.html
Siglent SSG5000X Series RF Analog / Vector Signal Generator  - Page 1
Forum section: electronics / testgear

author: oewean
author_rank: Contributor
timestamp: March 17, 2020, 08:11:29 pm
content: Found this on the Chinese websitehttps://www.siglent.com/products-overview/ssg5000x/

author: tautech
author_rank: Super Contributor
timestamp: March 17, 2020, 10:34:55 pm
content: Quote from: oewean on March 17, 2020, 08:11:29 pmYep spotted also.Higher frequency models of these:https://www.eevblog.com/forum/testgear/siglent-ssg3000x-series-rf-signal-generators/I'll update that thread with info on the 5000's when I get time.

author: oewean
author_rank: Contributor
timestamp: May 09, 2020, 11:30:20 am
content: Short time to official release of the Siglent SSG5000X, will update as soon is released :-)
USB-I2C interface supported by U-Center - Page 1
Forum section: electronics / testgear

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: May 09, 2020, 09:58:42 am
content: I designed and built asmall PCBthat carries the UbloxMax-M8W-0-10 GNSSmodule. Ublox have a (pretty clunky) program calledU-Centerthat communicates with their modules for monitoring communications and setup purposes. So far, all I've done is communicate with my Max-M8 module using a 3.3V USB-serial port but the Max-M8W is also capable of communicating via I2C and my PCB has I2C pins brought out to the 0.1" header and what I need is a USB-I2C interface that will work with U-Center.The only USB-I2C capable tool I have is theBus Pirateand it's OK but the UI is clunky (text in a serial terminal window) and finding good documentation is like looking for a pork chop at a Jewish wedding.The latestU-Center (20.01) release notessays it now supports the following I2C interfaces:Interface / Device / DLL versionDDC/I2C / Totalphase Aardvark I2C/SPI Host Adapter / aardvark.dll v5.15 for Windows 32-bitDDC/I2C / Diolan U2C-12 USB-I2C/SPI/GPIO Adapter / i2cbrdg.dll v1.0.0.9 for Windows 32-bitbut they cost $300 and $90 respectively. Is anyone aware of any other USB-I2C(SPI) adapter that would work with U-Center?I am a Windows 10 / PC user.
Help identify add-on board inside Tek 547 scope.  - Page 1
Forum section: electronics / testgear

author: Martin Hodge
author_rank: Unknown
timestamp: May 09, 2020, 04:27:18 am
content: Does anyone recognize this Tek 547 add-on board? It connects directly to the deflection plate pins of the CRT and has a 4pin xlr connector accessible through the left cowling. The board has 2 sections labeled "vertical" and "horizontal". It gets +/- 12.6 volts from 2 pins of the xlr connector and appears to provide shielded, single-ended H&V signals to the other two pins. Google Tek wiki have come up nill.
Tektronix 464 Bright Screen - Page 1
Forum section: electronics / testgear

author: sverzijl
author_rank: Contributor
timestamp: May 08, 2020, 10:09:04 am
content: Hi All,I've dusted off my father's old oscilloscope and I believe there may be an issue with the screen as it appears to illumination across the whole screen. Sometimes I turn it on and everything is fine. Other times it has flashes of light. Other times permanently on.Any thoughts on what could be wrong? It has sentimental value so I'd love to be able to get it working!

author: wn1fju
author_rank: Frequent Contributor
timestamp: May 08, 2020, 12:12:00 pm
content: Almost looks like it is set to storage mode. Make sure the "non-store" button is depressed and also hit the "erase" button a couple of times. Ultimately, youmight have to spray some contact cleaner in the switches if the behavior is intermittent.

author: sverzijl
author_rank: Contributor
timestamp: May 08, 2020, 02:38:36 pm
content: Brilliant - non-store was not active!Thank you very much.

author: Gyro
author_rank: Super Contributor
timestamp: May 08, 2020, 04:30:59 pm
content: It would be worth watching the storage modes video linked on the 464 TekWiki page and finding a downloadable copy of the manual...https://w140.com/tekwiki/index.php/464#Manualshttp://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Tektronix/Tektronix_-_464_Storage_Oscilloscope
Hantek 5102P bandwidth upgrade - Page 1
Forum section: electronics / testgear

author: jwny
author_rank: Newbie
timestamp: May 07, 2020, 06:30:09 pm
content: Hello,I am a beginner in electronics. I just upgraded my Hantek 5102P by using only DSO BW Change software to upgrade its bandwidth. The orignial bandwidth was 100 MHz. It seems everything works. But I am not sure if I did upgrade its bandwidth. Please see the image. Does 2 ns mean it is a 200 MHz oscillscope now? Thank you in advance!

author: maginnovision
author_rank: Super Contributor
timestamp: May 07, 2020, 07:26:59 pm
content: 2ns doesn't tell me anything. Maybe that's a key indication of this scope being 200MHz. I suspect wherever you found the data to unlock would tell you if this was a reliable way to determine bandwidth.

author: M0HZH
author_rank: Regular Contributor
timestamp: May 08, 2020, 09:20:01 am
content: This is DSO5102P supposedly non-hackable, came with 2ns option out of the box. I've heard 2ns also available on the DSO5072P.
EEVblog/BRYMEN BM235 Multimeter: backlight flashes in Continuity Mode - Page 1
Forum section: electronics / testgear

author: Tiny
author_rank: Newbie
timestamp: May 04, 2020, 02:28:57 pm
content: Recently my BM235 meter has started flashing the backlight continuously when in Continuity Mode - except when the probes are shorted. It doesn't matter whether the backlight-on mode has been chosen, the backlight just keeps flashing until the probes are shorted, and then starts again once the probes are not shorted. I was going to upload a video but it doesn't look like that is supported on the forum.I did a quick search here in the forum but was unable to find anyone else who had a similar problem.Does anyone have any suggestions before I open it up and have a look?TIA.

author: Grandchuck
author_rank: Super Contributor
timestamp: May 05, 2020, 11:31:28 am
content: Battery?

author: Tiny
author_rank: Newbie
timestamp: May 08, 2020, 06:28:07 am
content: No, battery is fine. Thanks for the suggestion though.A.
Fluke 45 error 8 - Page 1
Forum section: electronics / testgear

author: Mp3
author_rank: Frequent Contributor
timestamp: May 07, 2020, 12:02:10 pm
content: Fluke 45 errror 8?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2020, 12:17:10 pm
content: Maybe a cold solder joint ? socketed chip oxidation ? humidity ? since it restarted, does it work normally ? are the ranges and measurements seems to be ok ?

author: AVGresponding
author_rank: Super Contributor
timestamp: May 07, 2020, 08:37:14 pm
content: Definitely worth checking if it needs recapping as well.I don't have a 45, but I do have an 8840A, which isn't a million miles away, design and era-wise.Although I never had any issues re errors or bad measurements, the big reservoir cap for the 5V pre-reg was domed... no leaks though!If you've a dying cap vomiting electrolyte, it could easily cause weirdness. There aren't many in these, so it's not a huge job to swap them out.

author: M0HZH
author_rank: Regular Contributor
timestamp: May 07, 2020, 09:02:05 pm
content: Quote from: AVGresponding on May 07, 2020, 08:37:14 pmThat's a "design feature" of those caps, a thin plastic dome on top of them that looks like the cap is swollen. It's actually just fine, if you press on the dome you'll find it flicks and the real metal top of the cap is fine and flat. Those caps are actually quite good, haven't seen one leak or even go out of spec.

author: AVGresponding
author_rank: Super Contributor
timestamp: May 07, 2020, 09:05:29 pm
content: Better safe than sorry... and as it happens, the cap was out of spec, though all the others were fine.

author: Mp3
author_rank: Frequent Contributor
timestamp: May 08, 2020, 03:54:21 am
content: Thanks for the input everyone. I'm glad to know that it likely isn't a failure of expensive & difficult to find components then. I'll give it a good look over if it continues to behave for a while.
UT210E  wrong amps in CONTINUITY stuck or 0L - Page 1
Forum section: electronics / testgear

author: marce002
author_rank: Regular Contributor
timestamp: May 07, 2020, 08:29:06 pm
content: Hello allI have an UT210E clamp meter that went wrong doing amps measurements in continuity DC, it shows an offset of around 4/5A when first set, (lever at DC 10A) at 2A DC shows fixed 0L always......,,,,,, and also does not allow me to (zero button) , and as i said it is even worse in the 2A !! setting which do nothing and shows "0L"... when you can measure DV in 20A after achiving a ZERO with many RESET ZERO times , you can measure with a lot of offset..... eg 1A current is measured at around 650 mamps, . Similarly, a 4A current is shown at around 3A.What can be wrong?video with the issue:https://youtu.be/Wrffkx4lpA0

author: Fungus
author_rank: Super Contributor
timestamp: May 07, 2020, 10:54:34 pm
content: Haven't you already started a thread for this half a dozen posts down?

author: marce002
author_rank: Regular Contributor
timestamp: May 08, 2020, 05:46:43 pm
content: AgainWhat is wrong with this clamp? I have a ut210E nice for small DC measurements. One day stopped working... 2A shows always OL and in 20A shows an offset of 5A!!! Until reset several time I can get 0amps but measure is wrong

author: Fungus
author_rank: Super Contributor
timestamp: May 08, 2020, 05:56:40 pm
content: Quote from: marce002 on May 08, 2020, 05:46:43 pmSee replies in the other thread you started...

author: Simon
author_rank: Unknown
timestamp: May 08, 2020, 09:39:31 pm
content: If you post the same thing over and over you will get banned! I have locked this thread.
Bus pirate newbie-Controlling a standard HD44780 based LCD via PCF8574T I2C. - Page 1
Forum section: electronics / testgear

author: djsb
author_rank: Super Contributor
timestamp: May 06, 2020, 01:30:48 pm
content: I'm learning how to use my Bus Pirate V4. Thought I'd have a go at controlling a bog standard 16 x 2 HD44780 LCD that uses a PCF8574T i/o expander to convert it to I2C.I've been watching this videoI've managed to get as far as using the 7 bit address search function on the Bus Pirate and got this result"Searching I2C address space. Found devices at:0x4E(0x27 W) 0x4F(0x27 R)"Which is what I expected.I DO NOT want to use an Arduino as I want to get closer to the hardware which is why I'm using the Bus Pirate.If for instance I wanted to do the following1/ Clear the screen.2/ Turn the backlight on and off3/ Write some text.What would I enter at the command prompt?From the video I understand that there is a [for start then the slave address, then a command code, then a data byte, and then a stop]. This maybe only applies to the chip he is talking about.Would I be addressing the PCF8574 or the HD44780 when I send commands using the Bus Pirate. Do I just concentrate on studying the Hitachi chip or both?Has anyone got any examples command lines they can share? Thanks.

author: modoran
author_rank: Regular Contributor
timestamp: May 07, 2020, 04:40:33 am
content: You need to study:- i2c protocol itself, this applies toall chipsthat is i2c compatible, not just pcf8574- pcf8574 and hd44870 datasheetsYou will be talking with pcf8574 using i2c instructing it to change its outputs as needed by the hd44870 display driverArduino has LiquidCrystal_I2C library, look into it, this is not an easy task if you want to implement all from scratch.

author: djsb
author_rank: Super Contributor
timestamp: May 07, 2020, 06:06:21 am
content: Thanks Modoran,I've downloaded the LiquidCrystal_I2C library and I'll review some PIC assembly language stuff that covers the HD44870. I might buy a PCF8574T i/o expander breakout board (if such a board is available) and try to toggle some pins on that first.P.S Just ordered 4 PCF8574T i/o expander breakout boards, so I can try out how cascading I2C works and how to use them with the Bus Pirate.
High Resolution Mode on digital multimeters:  what is the driment of this mode? - Page 1
Forum section: electronics / testgear

author: parallax
author_rank: Contributor
timestamp: May 06, 2020, 08:40:17 pm
content: Many digital multimeters (DMM) offer a "high resolution" mode. All else being equal, it just seems to me that the "high resolution" mode would be more desirable than the default "standard resolution" mode. In this case, perhaps the "high resolution" mode should be the default mode. This makes me think that there must be some detriment to using the high resolution mode all the time, otherwise the manufacturer would have chosen for the DMM to default to "high resolution" mode, and either not offer "standard resolution" or offer this "standard resolution" as a secondary option.What is the detriment to using "high resolution" mode?

author: ogden
author_rank: Super Contributor
timestamp: May 06, 2020, 08:58:31 pm
content: Quote from: parallax on May 06, 2020, 08:40:17 pmSlow update speed. When you have Brymen 5 readings/sec hires and 60/sec fast mode then it is ok for hi-res to be default. Some other DMMs have 5 readings/sec "fast" mode and hires 1/sec or even slower which would be unacceptable as default mode.

author: parallax
author_rank: Contributor
timestamp: May 06, 2020, 09:13:22 pm
content: Thank you for the fast response. I am new the world of multimeters. I ordered a Brymen 869s and a Fluke 87V. Both should arrive later in the week. I am not sure what the update speed is for either of these two DMMs for either standard resolution or high resolution. If I cannot find the refresh rate numbers, is this slower refresh rate on high resolution mode something I would be able to detect during use?

author: alm
author_rank: Super Contributor
timestamp: May 06, 2020, 09:56:50 pm
content: Yes, a slower refresh rate is very obviously slower to respond if you have a signal that changes (e.g. a discharging eletrolytic capacitor, or a bench power supply as you turn the know). If you have two DMMs, you can hook them both up to the same signal, and set one to high resolution mode, and the other one to the lower resolution mode, the difference should be obvious.According to the Fluke 87V manual, its update rate is 4 updates per second in normal mode, and 1 update per second in high resolution mode:

author: ogden
author_rank: Super Contributor
timestamp: May 06, 2020, 09:59:38 pm
content: 5 updates/sec ofBrymenis good for everyday use. Hi-speed 60/sec rate is for PC data capture rather than display.

author: parallax
author_rank: Contributor
timestamp: May 07, 2020, 01:08:26 am
content: Thank you for all your help.alm, thank you for pointing that out. Perhaps I should be a bit more sober when reading manuals.
R&S Polorad 632C-1 - supposedly Tektronix - Page 1
Forum section: electronics / testgear

author: Hyper_Spectral
author_rank: Regular Contributor
timestamp: May 06, 2020, 02:38:01 pm
content: I recently acquired a spectrum analyzer from the early 80's called the "Polorad 632c-1"I've been trying to get my hands on an old scope for many years to mess around with and so that I have something with higher bandwidth if I ever need it.The problem is, this is a pretty obscure and uncommon spectrum analyzer, and I can hardly find any information on it other than it's probably not R&S and likely a tektronix design and has some drift +-5khz with spans below 100khz. I'd like to start using it, but I'm still pretty new and I don't even know what probes I should buy (or not, if it's a money sink). The front plate is pretty straight forward so I guess I could do without the manual but it would certainly help if someone did have one.I guess what I'm really asking for are two things1) Does anyone have more information on this piece of equipment?2) What would your next steps be if you were in my shoes with this piece of equipment and you were still learning?I'm not too invested in it, I paid $20 for it.

author: tautech
author_rank: Super Contributor
timestamp: May 06, 2020, 09:45:26 pm
content: Info seems hard to find about these however there are some suggestions the Polorad brand was acquired by R&S although they were NYC based.I'd try here for further info as it seems the site owner does have some old manuals etchttp://www.polarad.com/Old thread here:https://www.eevblog.com/forum/repair/polarad-sa-repair/

author: vk6zgo
author_rank: Super Contributor
timestamp: May 07, 2020, 12:10:26 am
content: Back in the day, I saw these used by Telecom Aust in the Comms side, along with SAs from Singer.The then Broadcast section I was in used HP SAs, pretty much exclusively.
BM235 - grabber ends that'll attach to existing leads? - Page 1
Forum section: electronics / testgear

author: AndyRobot98
author_rank: Newbie
timestamp: May 05, 2020, 07:07:13 pm
content: Hi - Sorry if this is a dumb question - I'm the happy owner of a EEVBlog BM235, and I'd really like to add a set of grabber ends. I don't really want a whole new set of leads: The existing ones are great, and I don't really want to plug/unplug them to switch.I'd like to get just the grabber part that you can attach to the end - but I have no idea how to tell if they will fit...Basically I want something like this:https://www.aliexpress.com/item/33049833782.html?spm=a2g0o.detail.1000014.8.30d446a42qJ8LG&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.14976.157518.0&scm_id=1007.14976.157518.0&scm-url=1007.14976.157518.0&pvid=62573d87-328e-49e5-a310-e505bd74b6c5&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.14976.157518.0,pvid:62573d87-328e-49e5-a310-e505bd74b6c5,tpp_buckets:668%230%23169576%231_668%23808%235965%23464_668%23888%233325%237_4976%230%23157518%230_4976%232711%237538%23523_668%232846%238111%23435_668%232717%237559%2322...it says it has a 4mm opening, which might fit the banana plug, but doesn't fit the screw threads (which are like 2mm).Apologies if this is a repeat - I tried to wade through the existing threads, and the posts I could find talked about full replacement leads (not just the ends...)Thanks!

author: sb42
author_rank: Contributor
timestamp: May 05, 2020, 08:22:20 pm
content: I would get the Brymen BL21S2-T4SC test leads, whose probe tips have a threaded base for the T4S screw-on banana plug adapters - then you can attach both 2mm and 4mm probe tips.Otherwise you'll need something with a 2mm spring-loaded socket. The Hirschmann 973501100 and 973501101 are like the ones linked to in your post; they're good quality but not rated for HV. Cat III parts are generally 4mm.

author: AndyRobot98
author_rank: Newbie
timestamp: May 06, 2020, 12:31:17 pm
content: Quote from: sb42 on May 05, 2020, 08:22:20 pmI think those are basically the ones that I got with the meter - It's a 2mm probe that accepts a thread-on 4mm banana plug that I have.Thanks for the tip on the "spring loaded socket" - I didn't know how they lead connect. So I presume the one I linked to on Ali-express, when it said it has a 4mm connector then it's likely 4mm spring loaded for the larger connector and not designed for the banana plug?The Hirschmann ones do look to be what I want. They seem tough to acquire though...

author: sb42
author_rank: Contributor
timestamp: May 06, 2020, 01:04:27 pm
content: Quote from: AndyRobot98 on May 06, 2020, 12:31:17 pmGreat, then they should work with smooth/unsprung 4mm sockets too.QuoteThat comment was about the type of socket you need if you only have bare 2mm probe tips with no other attachment.Looking at the photos for the aliexpress ones more closely, they seem to be threaded and hopefully compatible with your Brymen leads. Worth a punt for $3 anyway.QuoteAlso a bit pricey and only CAT I rated - but good if you need compact 2mm probes.
XDS3104E Bandwith hack? - Page 1
Forum section: electronics / testgear

author: Pluscrafter
author_rank: Regular Contributor
timestamp: May 05, 2020, 01:46:12 pm
content: Is there any bandwidth hack for the Owon XDS3104E?

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: May 06, 2020, 03:17:28 am
content: Good question! Or decoding hack would be nice too.
Rigol 1054Z Saving Memory to USB - Page 1
Forum section: electronics / testgear

author: engrguy42
author_rank: Frequent Contributor
timestamp: May 04, 2020, 03:41:19 pm
content: Why does it take so long to save a memory snapshot to USB?? It's only like a 62Meg file. It takes forever. Even if I shout at it and hit it with a stick it doesn't go faster.It's like 15-20 minutes or something.Arrrgghhh...

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: May 04, 2020, 04:31:18 pm
content: I think it's USB 1.0, that's why it's so slow, I don't think it's 2.0

author: engrguy42
author_rank: Frequent Contributor
timestamp: May 04, 2020, 05:19:03 pm
content: Quote from: Adrian_Arg. on May 04, 2020, 04:31:18 pmOh yeah, you're probably right. That's back when we had 28k modems and stuff.

author: Fungus
author_rank: Super Contributor
timestamp: May 05, 2020, 02:56:49 pm
content: Sometimes it goes fast. I think it might depend on the format of the stick or something. Or it might be something else. It can definitely go fast though.

author: klausES
author_rank: Regular Contributor
timestamp: May 05, 2020, 09:34:12 pm
content: Perhaps it is the preparation or converting before writing that takes this time, less writing ?Screenshots are written by my DS1104Z e.g. as a png strangely much faster (usually more than twice as fast)on the stick than jpg, although png are at most 20% smaller on average than jpg.It is probably less because of the speed of writing, rather that he needs less computing power for png than for jpg
Question on GW-Instek 2072EG - Page 1
Forum section: electronics / testgear

author: paul002
author_rank: Regular Contributor
timestamp: May 05, 2020, 12:47:24 pm
content: Just curious, I own a GW-Instek 2072 EG. This is a MDO scope (according to Instek) with a bandwith of 70 Mhz but also a spectrum analyser function till 500 Mhz. The spectrum analyser is not a conventional one but a FFT based SA that looks like the real thing. For the price you pay it is nice.But my question is for SA it uses the normal scope inputs, so those inputs should function till 500 MHz reasonable good. If I hook op a 145 Mhz device I can make also in scope function a good picture. So what do I have? a 500 Mhz scope for the price of 70 Mhz? There must be a catch. I don't have a good signal generator currently to plot the bandwith. But the bandwith has to go until 500 Mhz to support the SA or is there a switch in the scope to limit the bandwith to 70 Mhz when in scope function. Maybe somebody has done a teardown of the scope. I am curious in your opinion.

author: nctnico
author_rank: Super Contributor
timestamp: May 05, 2020, 01:01:30 pm
content: You have to take the 500MHz with a large pinch of salt. The analog front-end of this oscilloscope goes to little over 300MHz. 500MHz is the Nyquist frequency when sampling at 1Gs/s. What the 500MHz spec says is that the SA function will show frequencies up to 500MHz but there will be a >3dB error over 300MHz (up to 10's of dB at 500MHz). That is if the bandwidth isn't limited to the bandwidth in oscilloscope mode. I don't know that; you'd have to test. But there is a key generator to unlock 300MHz bandwidth anyway.

author: paul002
author_rank: Regular Contributor
timestamp: May 05, 2020, 02:29:00 pm
content: Thanks, is there a place to find older versions of the firmware, seems to be necessary to patch the firmware.
Tektronix 7603 broken pin off horizontal amp to CRT - Page 1
Forum section: electronics / testgear

author: Pascalken
author_rank: Contributor
timestamp: May 02, 2020, 09:23:01 am
content: Hi Tektronix fans,While restoring, repairing, a Tektronix 7603 mainframe, the pin from the horizontal amplifier to the CRT broke off.It looks that these pins have some spring action and are gold plated.Obviously I want to replace the broken pin with a similar pin that does not damages the CRT.Any suggestions?Thank you,Pascal

author: David Hess
author_rank: Super Contributor
timestamp: May 04, 2020, 01:20:43 am
content: Do you mean the CRT pin broke off?They are made of something like kovar which matches the temperature coefficient of expansion of the CRT glass.Conceivably you can clean the exposed end of the pin and solder some thin compliant copper wire to it to make that connection.

author: Pascalken
author_rank: Contributor
timestamp: May 04, 2020, 12:55:03 pm
content: Thank you for your reply,no, it is not a pin at the back of the tube.The tube is undamaged.It is a hole in the glass at the side of the tube wherein a pin, attached to a wire from the horizontal amplifier, fits.That is the pin that is broken. (see second picture of the good one and the broken off on)The hole has a diameter less than a millimetre, (see other picture, scale is in millimetre).Pascal
Availability of drivers for Litepoint hardware (PXI z8451 digitizer)? - Page 1
Forum section: electronics / testgear

author: DaJMasta
author_rank: Super Contributor
timestamp: May 03, 2020, 11:19:55 pm
content: I got my hands on a Litepoint z8451 PXI I/Q digitizer, on paper the specs are impressive and the card seems to be in fine shape, but I've been unable to get drivers for it. To download them from Litepoint's site, a login is required, and for some reason, this login has to be approved manually to be able to download anything. I've sent in a couple requests with not so much as a peep in response for several weeks.I was wondering if anyone had drivers available or if there was an external mirror or something. I don't need analysis software, I just want enough to get it to be properly identified and talking to labview and enough to verify that it's working. Maybe their site outage is temporary, but I've given it some time and they seem to be otherwise active and open for business, so if anyone has a lead I'd appreciate it.
owon b41t+ failing bluetooth connection - Page 1
Forum section: electronics / testgear

author: stepic7
author_rank: Newbie
timestamp: May 03, 2020, 03:31:27 pm
content: My B41T+ Multimeter use to work fine initially also as far as the bluetooth connection to the Android AppNow after a few months I can't get anymore the App to connect to the multimeter although the OwonB41 service apppears to be available among the bluetooth available devicesIt is the App itself which does not connect to the multimeterNor I do succeed to pair the OwonB41 bluetooth deviceI wonder it is a problem with bluetooth featuresAny suggestion?thanks
AVO Megger BM400 - please help to identify components - Page 1
Forum section: electronics / testgear

author: LazyJack
author_rank: Frequent Contributor
timestamp: October 20, 2019, 06:43:28 pm
content: I have an AVO Megger BM400 (I believe it is a non /2 type, it is in a yellow case) insulation tester, which had a bad case of battery leak. But, since it const peanuts, I'll try to revive it.Cleaning is underway, but I have found two components which seems to have let the magic smoke out. They are two SOT-23 components. One is completely busted can't see any markings, the other seems to have F8, so that should be probably some PNP transistor.If you happen to have a similar unit, could you help in identifying the them? I was unable to find any service manual or schematics.Thanks!

author: kehall
author_rank: Contributor
timestamp: May 02, 2020, 10:08:22 pm
content: Came across your post as I'm also looking for service manual/schematic for BM400/2 series - repairing a battery leak damaged unit, everything works except Ohms and continuity. However I can identify your components!D2p = BCW32 (equiv BC108B apparently)Hope this helps... Really would like to get some service info for these too (mine's a BM403/2)
Unknown Retro Programmer - Page 1
Forum section: electronics / testgear

author: santosp
author_rank: Contributor
timestamp: May 07, 2020, 01:25:11 pm
content: Hello.Have anyone see in the past such a serial programmer? Have a 28 pin ic socket and a mark "NSP 512 EPROM & PROM PROGRAMMER"

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2020, 05:13:33 pm
content: Maybe if you unscrew the casing there could be some pcb markings ??
Cancel an order from welectron.com? - Page 1
Forum section: electronics / testgear

author: kgavionics
author_rank: Regular Contributor
timestamp: April 30, 2020, 10:03:47 pm
content: HelloAnybody knows how to cancel an order fromwww.welectron.com.I recently, ordred a brymen bm869s, but apparently, it going to take an eternity before they ship it!I want to cancel this order i made, but in their website under my account i can't find any option to cancel an order!can someone tell me please how can i cancel this order?thanks in advance

author: thm_w
author_rank: Super Contributor
timestamp: April 30, 2020, 10:13:31 pm
content: It says its in stock on their site.https://www.welectron.com/Brymen-BM869s-Multimeter_1If you can't cancel it in your account online then call them.Not sure why you'd order from europe though, unless its impossible to get here?

author: stafil
author_rank: Regular Contributor
timestamp: April 30, 2020, 10:15:25 pm
content: Send an email to info@welectron.com asking to do so. That's how I cancelled my order.

author: kgavionics
author_rank: Regular Contributor
timestamp: April 30, 2020, 10:25:22 pm
content: Quote from: thm_w on April 30, 2020, 10:13:31 pmI ordered from europe, because i didn't find it neither on amazon.ca nor ebay.ca!
Question about my new differential probe - Page 1
Forum section: electronics / testgear

author: jacklee
author_rank: Regular Contributor
timestamp: April 27, 2020, 09:23:26 am
content: I feel good to MicSig since I bought their full touch scope, so I also bought their differential probe from Aliexpress recently. The price does satisfied me. And so far so good.But I have a question, compared with my old pintech N1008B, the output line of MicSig's differential probe seems more thinner, maybe this is a bit silly, but does that mean MicSig differential probe has lower quality output line???

author: maginnovision
author_rank: Super Contributor
timestamp: April 27, 2020, 03:13:44 pm
content: It's potentially a place for lower cost but it won't affect performance so doesn't really matter.

author: schmitt trigger
author_rank: Super Contributor
timestamp: April 27, 2020, 03:33:22 pm
content: As technology advances, smaller components and improved packaging techniques allow for much smaller products.As Dave famously says, let's tear the unit down. You could open up both units, and take some well focused close up photos of both PWBAs.Please post them here if you do. People here would thank you profusely.

author: David Hess
author_rank: Super Contributor
timestamp: April 27, 2020, 09:00:53 pm
content: The output is 50 ohms and the bandwidth is limited so there is no advantage to a better output cable.

author: garrettm
author_rank: Frequent Contributor
timestamp: April 27, 2020, 10:41:58 pm
content: Quote from: David Hess on April 27, 2020, 09:00:53 pmI don't think the probe has a 50ohm output, considering the unit in question states "into 1Mohm." But I do agree: whatever coax MicSig chose to use isn't really that big of a deal so long as it doesn't cause excessive reflection or attenuation for the signals of interest (<<100 MHz). Aside from mechanical robustness of the thicker coax used on the Pintech, the thinner coax on the MicSig might be more amenable to working on a messy bench without getting in the way.

author: fanOfeeDIY
author_rank: Unknown
timestamp: May 01, 2020, 02:06:32 pm
content: Hi,I do not have any MicSig probe so this is my pure general experience of working at some companies in the past.The good coex cable has smaller diameter with the same characteristics is more expensive than regular diameter one.Also the good outer PVC Which has soft and smooth touch is more expensive than some of the silicons which are sticky.So I am not sure the thinner cable is the cheaper or expensive one only from the diameter.Liking the product or not probable good thing to care for the end user.
USB Scopes and others - Page 1
Forum section: electronics / testgear

author: Beakster
author_rank: Newbie
timestamp: April 29, 2020, 04:33:19 pm
content: Hi,I'm interested in learning a bit more about how amateur radios work as a hobby and being able to do repairs/tuning up.I think an Oscilloscope would help me visualise what's happening in the radio and I've very interested in the convencience of a USB scope. I understand most replies will say that a USB scope is not as good as a dedicated one and it's best to pay more.I expect I need a 50MHz bandwidth scope to cover the full HF band. Some of the ones I had a look at are:Hantek 6052BELoto OSC2002Does anyone have any experience of these or know somewhere on the internet where people discuss USB scope?I've ordered a USB SDR recevier which as I understand it will function as a basic spectrum analyser. The other thing I'm looking for is an RF signal generator. Is anyone aware of any RF Signal generators that ideally can be purchased as a kit?Thanks

author: karamba
author_rank: Contributor
timestamp: April 29, 2020, 05:17:08 pm
content: Have a look at the next model up Hantek 6254BD, It has AWG, which might work for you instead of buying a separate generator.

author: GreyWoolfe
author_rank: Unknown
timestamp: April 29, 2020, 05:37:49 pm
content: Another point to ponder and ruminate on-last I knew, SDR receivers won't work in the HF Ham bands without additional equipment and hackerage. I assume you have done your research and know what you have to do.Don't know if you have seen the insides of any radios yet but the older hollow state equipment is far easier to work on than the more modern equipment. I have seen the inside of my Kenwood TS-940SAT and it looks like someone stuffed 10 pounds of stuff in a 5 pound enclosure. On the flip side, with hollow state, you have lethal voltages. It's not just a repair job, it's an adventure!
Tektronix 2225 repair, need help  - Page 1
Forum section: electronics / testgear

author: ulyanoff
author_rank: Contributor
timestamp: April 29, 2020, 09:20:21 pm
content: Hello again! My next project - repair Tek2225(no display). In power supply very low line +8.6v and -8,6 because transistor is short , blew smoke during measurements. This transistor on board A2 , position Q706 , from Motorola. Tektronix 151-0736-00 . I am not find type for replacement .. What is a type this transistor ? Help !

author: tautech
author_rank: Super Contributor
timestamp: April 29, 2020, 10:21:39 pm
content: Quote from: ulyanoff on April 29, 2020, 09:20:21 pmStudy the first post in the Repair Documents thread in the Repair board for a link to Tek parts cross reference.You can also Move Topic to the Repair board with the link at the foot of your page.

author: wn1fju
author_rank: Frequent Contributor
timestamp: April 29, 2020, 10:24:00 pm
content: Did you even try to Google the part number? Several eBay listings for it (at least in the USA).Otherwise, the Tek cross-reference .pdf file is something you should obtain. It shows the transistor as a 2N4401, available just about anywhere.

author: ulyanoff
author_rank: Contributor
timestamp: April 30, 2020, 12:47:13 pm
content: Thank you all for your help. it was simply incomprehensible due to the fact that in the manual Tek2235 a transistor with the same part number was named differently. And I also did not find a datasheet on it. Now everything is OK!p/s/ Also thanks for Tek parts cross reference! That helped!

author: ulyanoff
author_rank: Contributor
timestamp: April 30, 2020, 08:09:50 pm
content: Temporarily installed 2n3904, received an image - this is very good! I noticed that trigger level on both channels does not work at all. New problem ..