hybridfree/eevblog-posts huggingface dataset:
ComTEKK SINAD meter - Page 1
Forum section: electronics / testgear

author: tozitom
author_rank: Contributor
timestamp: May 15, 2019, 10:23:56 am
content: hi forum,has anyone tested this app? I've been working around with it, with free 30 days trial version and wonder if anyone has any axperience? is it accurate? As I don't have a SINAD meter (yet), I just want to know more about it.Thanks

author: Rerouter
author_rank: Super Contributor
timestamp: May 15, 2019, 10:47:33 am
content: Cannot speak for that app at all, but on the principle of how higher end equipment measures it, it seems within the scope of what a phone or similar device could process, seeing as it seems to mainly use digital filtering and process based on a ADC data feed, with unless I am mistaken no significant hardware in the path, however where I would take caution is that I am not sure with modern phones you can ever access the true "RAW Feed", for the internal microphone, I would assume its run though atleast some level of filtering before its handed to the application which may alter the readings your expectingAt a minimum you could likely also approach this with a PC's mic in, and run an android emulator to allow you some better hardware in the mix,Best reference I was able to dig up for how the measurements are done was below.http://www.miko.hk/IFR/885.pdf
Spirent Communications TAS 4500 (TAS4500) RF Channel Emulator  - Page 1
Forum section: electronics / testgear

author: ZL1CVD
author_rank: Regular Contributor
timestamp: May 15, 2019, 01:47:29 am
content: Does anyone have any experience with Spirent Communications TAS 4500 (TAS4500) RF Channel Emulator.Specifically, I want to know what is inside. I am interested in the built-in local oscillator, attenuator and RF 25~3000MHz front end. Pictures would be fantastic. Want to know if anything could be repurposed (PXI, PXIe, Compact PCI, Etc) or if it is all custom boards.Cheers!
Siglent SDS1202X and SDS1202X-E, the price difference by one order. Why? - Page 1
Forum section: electronics / testgear

author: CiscERsang
author_rank: Regular Contributor
timestamp: May 11, 2019, 01:29:48 pm
content: Hello everyone,Siglent SDS1202X and SDS1202X-E, the price difference by one order. Why? It seems the latter one has more options and newer, however it notable cheaper.Could anyone enlighten me?BR

author: Rerouter
author_rank: Super Contributor
timestamp: May 11, 2019, 01:38:36 pm
content: the X-E is the newer economy model, to my knowledge the X-E is equal or better in most ways (likely due to being a much more recent model), at a guess tautech can jump in soon and give the full run down on the differences.

author: CiscERsang
author_rank: Regular Contributor
timestamp: May 11, 2019, 02:12:55 pm
content: I got that,however, difference at hardware isn't revealed by manufacturer, of course.Also,I was considering Keysight 1102G as my firstdigitalscope, when I saw its price...1102G is mostly similar (except quite weak built-in Gen.) to 1102X-E (am I correct?), but price is also by one order...BR

author: tautech
author_rank: Super Contributor
timestamp: May 11, 2019, 08:35:29 pm
content: Quote from: CiscERsang on May 11, 2019, 02:12:55 pmThe datasheets tell all............physical differences, different capability and some different/better features.Study them.For the hobbyist the price dictates the X-E as the better choice allowing saved funds to be spent on some other equipment to complement the 2ch X-E.

author: TK
author_rank: Super Contributor
timestamp: May 11, 2019, 09:02:50 pm
content: An order of magnitude is when you multiply by 10... Maybe you wanted to say double or twice?

author: TK
author_rank: Super Contributor
timestamp: May 11, 2019, 09:05:44 pm
content: Quote from: CiscERsang on May 11, 2019, 02:12:55 pmKeysight 1102G is a 2GSa/s scope and has 2+1 channels (1 digital), so it can decode SPI without using CS timeout mode. Siglent is a 1GSa/s scope that goes down to 500MSa/s when using both channels.

author: tautech
author_rank: Super Contributor
timestamp: May 11, 2019, 11:39:54 pm
content: Quote from: CiscERsang on May 11, 2019, 02:12:55 pmNo such model.For 2ch X-E the choices are SDS1202X-E or the later released 2GSa/s 200 MHz SDS2202X-E and 350 MHz SDS2352X-E that offer the same feature set as the 4ch X-E's plus 50 ohm inputs.@ $619 for SDS2202X-E base model (no options) with 28 Mpts memory and the options to add AWG and/or 16ch MSO later makes them quite attractive.We wait for news that a 4ch version of SDS2000X-E is coming but no whispers of one as yet.In all cases the X-E's use the newer and faster processor for much better FFT and general performance.

author: CiscERsang
author_rank: Regular Contributor
timestamp: May 16, 2019, 06:51:35 am
content: Quote from: TK on May 11, 2019, 09:02:50 pmyes, I wanted to say almost double...
Any idea of what's this for? - Page 1
Forum section: electronics / testgear

author: tozitom
author_rank: Contributor
timestamp: May 14, 2019, 10:24:37 am
content: Hi forum,Just got this instrument on my bench but cannot find any info on it! There's no make/model only what you see! My first thought was a audio distortion analyser, but seems not... When injecting 1khz input I can measure rms voltage (almost accurate), but no freq measurement on display, when switching to distortion I get freq counter ok (1.01/1.02 khz) and also I get an output with some shift from original depending on big coarse pot... On picture (1) is input (2) is output.

author: EricJRW
author_rank: Newbie
timestamp: May 14, 2019, 03:03:29 pm
content: What does the back look like?

author: tozitom
author_rank: Contributor
timestamp: May 14, 2019, 03:05:06 pm
content: Thanks for your reply. Back is nothing special, only 220v plug and sticker "made in italy"

author: Grandchuck
author_rank: Super Contributor
timestamp: May 14, 2019, 03:29:13 pm
content: Sure looks like a distortion analyzer. To use, one tunes the notch filter to null out the fundamental. The fine tune makes it easier to get a good null. What is left is THD and read on the meter. The controls seem to support that. Could be fun and instructive to play around with. Nowadays, THD and FFT software that runs on sound cards in computers has kind of taken over.

author: Old Printer
author_rank: Frequent Contributor
timestamp: May 14, 2019, 04:23:44 pm
content: Like Dave says, take it apart, at least to look inside for some sort of manufacture info. It might have been intended for sale under a third party label, hence no exterior markings, but somewhere that should be some clues. Interesting.
Can you identify this micro-minature RF connector? - Page 1
Forum section: electronics / testgear

author: stevec5000
author_rank: Contributor
timestamp: May 14, 2019, 05:46:21 am
content: My Aeroflex IFR/Lignex1 spectrum analyzer has these little gold connectors like the one in the center of the pic. Does anyone know who makes it or what it is called? It looks like an SMB but is smaller in diameter. While the SMB is 3.66 mm in diameter this one is just 2.7mm! It's similar in diameter to the MMCX but longer. Hirose makes some small ones like their UM series but I couldn't find one just like this. Any ideas?

author: stevec5000
author_rank: Contributor
timestamp: May 14, 2019, 12:41:36 pm
content: It looks like an SSMB connector.

author: VK5RC
author_rank: Unknown
timestamp: May 14, 2019, 12:57:30 pm
content: Thanks for letting us know, I couldn't find anything like it. Never heard of ssmb - so many connectors!
Sweep Time for Parametric Analyzer - Page 1
Forum section: electronics / testgear

author: mTester
author_rank: Newbie
timestamp: May 14, 2019, 03:38:08 pm
content: Hello,I'm a PhD student using an Agilent 4155C parameter analyzer in a basic sweep measurement. I had a question about the smallest hold time duration that will be applied. I am currently setting the hold time and the wait time to 0. I wonder if you could tell me what is the actual duration of the voltage applied (for voltage sweep)? It’s needed so I can calculate the energy applied for the measurement.Looking at the datasheet (page 6 below), I see that the resolution for the hold time to be 10mS and the wait-time is 100uS. Is there any reasonable approximation regarding the duration of the step I can make (for example, each step is 50uS -- half of 100uS wait time resolution):http://www.libertytest.com/assetmanager/uploaded/pdf-2008415-112835-at_4155c.pdfI appreciate any help or insight you can offer. I do not have access to a separate oscilloscope I can use to verify the pulse being applied.thank you!
HP 6622A - Looking for front panel, feet and few bits - Page 1
Forum section: electronics / testgear

author: No.Mad
author_rank: Regular Contributor
timestamp: May 15, 2019, 09:53:36 pm
content: Hi there,I am looking for front panel of a HP 6622A System Power Supply as the one I received recently (lucky score on Ebay) is cracked and bent - will attach photos later. This poor puppy is missing also two front snap-in feet and the rear brackets for side handles are cracked.I checked Buy/Sell section, Ebay, Keysight site, I went even on Amazon and Gumtree (I'm UK based). No luck, go fishing.Could anyone point me in right direction (or person) and save the day?Cheers and have a nice day (night)!EDIT: Alright, I checked Service Manual and found corresponding parts on Keysight site (I was wrongly forming Google question)Front panel: 5040-1660Foot: 5041-8801Strap rear cap: 5042-8820They are available but THE PRICE, oh come on. I reckon it's probably only US based, no Europe retail or dispatch centre. Does anybody have these as spare parts and would like to sell it?
keithley 195 option repair - Page 1
Forum section: electronics / testgear

author: tjl0023
author_rank: Newbie
timestamp: May 12, 2019, 09:02:53 pm
content: I purchased a keithley 195 with the option installed but the amps range only works on the 20uA and 100uA range. All of the other amp ranges show "-oflo". The adc works fine so i have a feeling its just something with the range switching but i cant find any info about it. any suggestions on what to do next?

author: lowimpedance
author_rank: Super Contributor
timestamp: May 12, 2019, 11:31:04 pm
content: The online manual has the schematic of the option and also in the maintenance section there are tables showing which relays / FET's that are used for each range/function etc.Do the ACV ranges work correctly or do they fail in a similar pattern ?.

author: TurboTom
author_rank: Super Contributor
timestamp: May 12, 2019, 11:45:49 pm
content: I can't tell for sure in your case but I recently fixed a 195A that had several of the analog multiplexer JFETs blown. These seem to be quite fragile actually. I ended up replacing all of them (Q102~104, Q107~114, Q121, Q122). Some are selected types (Q121,Q122) and I did my best to find failrly good matches to these -- one of the original transistors was still okay so I was able to measure the on-resistance.If the DC ranges on your 195 are working correctly, you may want to have a look at Q502 and Q503 and maybe also Q505 and Q506 on the AC option board.Good luck,Thomas
HP 35660A DSA Battery Location - Page 1
Forum section: electronics / testgear

author: Smoky
author_rank: Frequent Contributor
timestamp: May 14, 2019, 03:10:48 am
content: For those who have disassembled an HP 35660A in the past, would you happen to know the location of the back-up battery?I lifted the case on my DSA over the weekend for a quick cleaning expecting to find a battery that keeps the time and date current.No battery in sight.Thank you!

author: Tomorokoshi
author_rank: Super Contributor
timestamp: May 14, 2019, 05:05:56 am
content: If the 35660A is like the 35665A, then it's on the board just under the power supply. Here is the process for the 35665A:https://www.glkinst.com/test-equipment/Scroll down to "HP / Agilent 35665A Options Upgrade".

author: Smoky
author_rank: Frequent Contributor
timestamp: May 14, 2019, 06:09:59 am
content: Thank you Tomorokoshi.Unfortunately, the memory boards differ between the 35660A and the 35665A. And from what I've read, the 35665A has many more options and capabilities. Also, the 35660A memory board is totally populated with chips with no room for an "AA" cell.I downloaded the 35660A service manual from Keysight and none of the schematics show a symbol for a battery either.I also spoke with George from GLK and he doesn't believe the 35660A has a battery similar to the 35665A.On top of that, the interior of my early 35660A differs with the 35660A Dave explores in his tear-down video. I think Dave even mentions that his boards didn't jive with the schematics.The clock in my machine reverts back to 9/27/88.Serial number 2816A00399Version A.00.01Anyway, my DSA runs absolutely fine and passes all internal tests, so there is probably no harm leaving things as they are.*Update* For those who own a 35660A, 35665A, 3588A, or a 3589A, Newscope will be introducing color LCD retrofit kits for your DSA this year.Also, I discovered that there is a Google Group that consists of the HP design engineers who built the 35660A and the 35665A DSA's.
Cheap USB scope reviewed by Matthias - Page 1
Forum section: electronics / testgear

author: IanB
author_rank: Super Contributor
timestamp: May 11, 2019, 06:27:53 pm
content: Gotta say this looks quite reasonable for so little money:https://youtu.be/Dio3wavUpTM

author: ataradov
author_rank: Super Contributor
timestamp: May 11, 2019, 08:52:39 pm
content: It appears like it is supported by sigrok, which makes it even more attractive.

author: Gyro
author_rank: Super Contributor
timestamp: May 12, 2019, 10:17:54 am
content: Yes, Sigrok support is attractive [EDIT: only 'planned' status at this point], and the UI is better than Hantek's on-screen knob rubbish. At $65 US however it falls far short of the competition at $0 to $10 more.e.g.https://youtu.be/di-UndlTnac
Triaxial test cables for HP 4140B pA meter? - Page 1
Forum section: electronics / testgear

author: TERRA Operative
author_rank: Super Contributor
timestamp: May 07, 2019, 07:46:58 am
content: I recently got my hands on a HP 4140B pA (pico amp) meter and DC voltage source for a good price. I figured it'd be something fun to play with.It looks like the pA input uses a triaxial connector, of which I have nothing in my stock of parts.I found this on Digikey, but it's not the cheapest test lead out there (I know triax is expensive...)https://www.digikey.com/product-detail/en/pomona-electronics/5342/501-1407-ND/737265Does anyone have any suggestions on what sort of test lead I should even be looking at? Also, does 50ohm/75ohm matter here?

author: HighVoltage
author_rank: Super Contributor
timestamp: May 08, 2019, 07:34:56 am
content: The keyword to search on the used market is "trompeter" and "triax".Sometimes you can get lucky to find good cables and connectors for a good price.The price on Digikey is not too bad.I have seen much higher prices for name branded cables.

author: VK5RC
author_rank: Unknown
timestamp: May 08, 2019, 09:39:11 am
content: + search for the term TRB connector, the cable is relatively cheap but the connectors crazy, watch out for 2 (older) and 3 lug versions. If you make your own - remember the impedance needs to be in terraohms - no touch!

author: TERRA Operative
author_rank: Super Contributor
timestamp: May 08, 2019, 10:23:50 am
content: Cool, thanks for the info, I'll keep having a look around here and there.I have the 3 lug type on my machine, they seem common enough.I'll also be sure to not touch stuff, maybe I'll wear gloves if I assemble my own cable. Would a wipe down in 99.9% Isopropyl alcohol be alright if needed?

author: VK5RC
author_rank: Unknown
timestamp: May 13, 2019, 12:05:42 pm
content: I made two 2 to 3 lug adapter cables - to join my Keithley Electrometers (617 619) to a HP Test Fixture Set (16058A).I used the no touch technique - but had washed my hands in IPA first - and the resistance between the layers of triax was not measurable - so I was happy.Those are expensive connectors!Hope it goes well.Rob
Keithley 2000 DMM Matlab mdd - Page 1
Forum section: electronics / testgear

author: gossamer
author_rank: Contributor
timestamp: May 12, 2019, 07:42:17 am
content: I just acquired one of these puppies. I would like to connect it with the Matlab and log the data for the analysis. I am bit confused about ways to connect it to Instrument control toolbox. While some of the manufacturers are providing readily available mdd files for their equipment, Keithley 2000 is not one of them. At least I can’t find one.Does anyone have experience with data logging from Matlab? Is it just the case of sending SCPI commands over rs232 or do I need the mdd file? Also does anyone have one for the 2000?Thanks
Hantek DSO-4084B sourcecode - Page 1
Forum section: electronics / testgear

author: Pluscrafter
author_rank: Regular Contributor
timestamp: May 11, 2019, 09:30:17 pm
content: On the website of Conrad you can download the sourcecode of the Voltcraft DSO-1084E, witch is a rebranding of the Hantek DSO4084B.https://www.conrad.ch/de/p/voltcraft-dso-1084e-digital-oszilloskop-80-mhz-4-kanal-1-gsa-s-64-kpts-8-bit-digital-speicher-dso-1589981.html?WT.srch=1&gclid=EAIaIQobChMIyK2gl7SU4gIVVOJ3Ch1dHA78EAYYASABEgKsT_D_BwE&utm_campaign=shopping-online-de&utm_content=shopping-ad_cpc&utm_medium=search&utm_source=google-shopping-deThe firmware is an older one(31.08.2018).
PTCs on Fluke 8845A bench DMM using math functions - Page 1
Forum section: electronics / testgear

author: BLF Lexel
author_rank: Newbie
timestamp: May 09, 2019, 05:48:07 pm
content: Hello,as the 8845A does not have that feature build in the software I simply used the math with offset and multiplicator to get the temperature shownit is in kOhms range, but the value represents 1:1 to °CUsed a cheap 2x3mm 100 Ohms 38.5K PTCbuild myself a kelvin cable with detachable sensor cutting an USB cable in half- cutting off the male USB plug- female side has on the cut end to 4 banana plugs- male side has the PTC soldered with 4 silicone leads as Kelvin probe- so the actual cable resistance is eliminatedmath can be also adjusted to calibrate the PTC in ice and boiling waterhttps://youtu.be/FFzoJUZd9ak

author: kado
author_rank: Regular Contributor
timestamp: May 10, 2019, 07:10:00 am
content: Thanks for sharing.KarstenGesendet von iPhone mit Tapatalk

author: voltsandjolts
author_rank: Unknown
timestamp: May 10, 2019, 07:53:51 am
content: I think using a 100Ohm PRTD would be a better option.They are supported by the 8845/46 for degc readout and are widely available for a couple of bucks (smd chip PRTDs).

author: BLF Lexel
author_rank: Newbie
timestamp: May 10, 2019, 10:31:36 pm
content: Quote from: voltsandjolts on May 10, 2019, 07:53:51 amI use a 100Ohms Platinum 3x4mm chip with 38.5Ohm/100Kthe 8845A seems not to have °C option for them, or am I missing something?

author: voltsandjolts
author_rank: Unknown
timestamp: May 12, 2019, 04:15:13 pm
content: Apologies, I skim read your post and I misunderstood it.I use the the terms NTC/PTC for thermistors and PRTD for platinum sensors - I thought you were using a thermistor not a PRTD.And I was doubly wrong..8845 doesn't have PRTD degc readout like the 8846, hence your post.Hah, ignore me and carry on!
Help Repair TEK 2467B - Page 1
Forum section: electronics / testgear

author: GasGas
author_rank: Contributor
timestamp: May 10, 2019, 04:00:12 pm
content: Good Morning.Since yesterday my only scope, the TEK 2467B began to present defect. Soon in the first minutes of operation everything works well, then begins to present the defect as it can be seen in the video. I realized that there is a large voltage swing in the resistors R2101 and R2102 when the defect manifests itself. The electrolytic capacitors of the source were all changed 2 years ago, as well as the electrolytic capacitors of the A5 plate that usually leak. I am not an engineer, I am a repairman of Tv, please someone can help me? I am in Brazil, here there is no chance to buy another plate or send for repair.I thank you from the heart who can help me.https://www.dropbox.com/s/agct84zdz60z3lk/MOV00192.AVI?dl=0

author: med6753
author_rank: Super Contributor
timestamp: May 10, 2019, 05:38:27 pm
content: Before going any further....monitor all the supply voltages at J119 on the main board. Make sure they are absolutely stable.

author: med6753
author_rank: Super Contributor
timestamp: May 10, 2019, 05:48:29 pm
content: In case you don't have the manual.J119 location on the main board.And the expected voltages at J119.

author: GasGas
author_rank: Contributor
timestamp: May 10, 2019, 05:53:47 pm
content: Thank you very much.Since I only have this scope, I'll try to use it myself to check the ripple. Then return with the result.

author: GasGas
author_rank: Contributor
timestamp: May 10, 2019, 06:48:52 pm
content: The voltages I found at the connector, starting from left to right, top of the connector:-1.41V, -1.41V, 4.94V, -8V, 0V, 42,36V, 86,98VFrom left to right, bottom of connector:-14.96V, 4.97V, -18.78V, 9.99V, -4.97V, 14.96V, 0V

author: med6753
author_rank: Super Contributor
timestamp: May 10, 2019, 09:53:17 pm
content: It appears your voltages are OK. In your video does the scope continue to do that or just once and then operate normally?

author: GasGas
author_rank: Contributor
timestamp: May 10, 2019, 09:58:31 pm
content: I'm working hours on it already, and now this video swing is happening less routinely. By centering the beam in the center of the screen, and selecting GND at the input of channels 1 and 2, I realize that the beam is wobbling a bit. I noticed that the 1.36V voltage that the diagram indicates on the A5 board is 1.42v and when the fault happens more pronounced, I noticed that this voltage oscillated a lot.

author: GasGas
author_rank: Contributor
timestamp: May 11, 2019, 10:51:10 am
content: Please I need help. I have identified that the defect is the vertical oscillation of the beam, the amplitude of the signal does not change, what changes is its position on the screen.
MTester no version on LCD - how to check the version? - Page 1
Forum section: electronics / testgear

author: Chriss
author_rank: Frequent Contributor
timestamp: May 09, 2019, 07:07:23 pm
content: Hi!I got today a cheap MTester from ebay.It is working very well, but I'm curious which firmware is in my tester,because I can't determine the FW version by starting the device.I saw on several videos and descriptions does they have on the startup screen MTester x.xx version.Maybe I would update my hardware with a more accurate firmware or with a newer one if it is needed.Or, if you guys/girls have a better firmware what I should upload to my device then my I assume china clone ,that would be also nice to me.Thank you for any idea and help.My best regards.

author: madires
author_rank: Super Contributor
timestamp: May 09, 2019, 07:20:35 pm
content: K or m-firmware. In case of insomnia you might want to readhttps://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/.

author: Chriss
author_rank: Frequent Contributor
timestamp: May 09, 2019, 07:37:32 pm
content: Thanks for the quick reply, I read that and similar articles here on the forum and also on mikrocontreoller web page too, but I didn't got any idea how to identify my FW in my device.My device looks exactly like this:And hase an ATmega328 uC and 8MHz oscillator.What is the most usable firmware what you are use with this device?Thanks.

author: madires
author_rank: Super Contributor
timestamp: May 10, 2019, 10:28:15 am
content: Your tester's firmware is a modified k-firmware with a fancy UI added, but less functionality because of the flash usage by the fancy UI. The best firmwares are the k and the m-firmware. If you have trouble with choosing one buy another tester and run both firmwares.
How to update firmware through ST link V2 - Page 1
Forum section: electronics / testgear

author: hongthiet1994
author_rank: Contributor
timestamp: March 06, 2019, 08:12:45 am
content: I want to upload firmware for my 121gw eeVBlog through ST-link like this picturehttps://photos.app.goo.gl/bSPMd2Qv6rhi1VHv6I used st-link v2 of another board stm to program for 121GW but can nothttps://photos.app.goo.gl/5BQLaaMsR9Akor8y5Please help me!Thank you so muchMy email: hongthiet1994@gmail.com

author: Jeroen3
author_rank: Super Contributor
timestamp: March 06, 2019, 08:24:43 am
content: I'm fairly sure you need to turn on the power of the 121GW in order to able to communicate with the chip.

author: tsman
author_rank: Frequent Contributor
timestamp: March 07, 2019, 12:22:23 am
content: Flashing the downloaded firmware file using a ST-Link is a bad idea. The file doesn't contain the bootloader or your meter specific calibration data.What has happened to your EEVblog meter that it needs a replacement LCD and the firmware to be flashed using a ST-Link?

author: hongthiet1994
author_rank: Contributor
timestamp: March 07, 2019, 01:32:20 am
content: I want to reprogram for 121gw

author: oliv3r
author_rank: Frequent Contributor
timestamp: May 09, 2019, 07:32:02 pm
content: There is a bootloader inside the STM32, so you don't need to do it via STLink, you can put your binary on the SD card to flash it. Check out how to update the firmware 'normally'. Also checkout the firmware hacking thread to see what people have done already

author: dcac
author_rank: Frequent Contributor
timestamp: May 10, 2019, 01:02:25 am
content: There’s some information here on programming the meter through its debug connector:https://github.com/tpwrules/121gw-template
Problems Updatging Agilent E4406A Firmware - Page 1
Forum section: electronics / testgear

author: RCHRDM
author_rank: Regular Contributor
timestamp: May 07, 2019, 08:00:57 pm
content: HelloI have been trying to update the HP/Agilent E4406A VSA firmware using the updater program downloaded from Keysight on an XP computer. After numerous tries, this is not working. I can't update the rather old firmware.Has anyone gone through this who could help?Richard

author: TK
author_rank: Super Contributor
timestamp: May 07, 2019, 08:10:21 pm
content: What error do you get and at what stage? How is the VSA connected to the PC?

author: RCHRDM
author_rank: Regular Contributor
timestamp: May 07, 2019, 10:50:38 pm
content: Here is a description of the process I am using and the messages.Richard

author: TK
author_rank: Super Contributor
timestamp: May 07, 2019, 11:00:04 pm
content: Are you using a cross over cable? If you are using a regular Ethernet cable, you need to use a HUBAlso try using the IP address 128.1.1.1 on the PC and 128.1.1.2 on the VSANetmask 255.255.0.0

author: RCHRDM
author_rank: Regular Contributor
timestamp: May 07, 2019, 11:02:58 pm
content: Thanks. Yes, I am using a cross over cable.I will try those IP settings but it may be a couple of days before I can get to this.Richard

author: RCHRDM
author_rank: Regular Contributor
timestamp: May 09, 2019, 03:59:13 am
content: I tried those IP settings, but the updater still won't proceed.Richard
Keithley 2100/200 Multimeter - Noisy? - Page 1
Forum section: electronics / testgear

author: CaptainObvious
author_rank: Contributor
timestamp: May 07, 2019, 05:13:42 pm
content: I was just casually browsing multi meters and came across an interesting post on Amazon... just curious if this is a "CYA" (cover your a%!) kind of legal mumbo jumbo or if this is a legitimate problem with this multimeter? Specifically talks of interference of radio and TV broadcast.... from a multimeter?Quoting from the Amazon page:QuoteFor anyone curious to see the post, this is being sold and shipped by Amazon here in the states:https://www.amazon.com/Keithley-2100-220-Multimeter-Resolution/dp/B00HLD05M2/I don't think I'll end up buying this regardless, mainly due to budget.. but this is the first I've heard of this and figured it was just Amazon trying to cover their ass. A quick search didn't bring up any forum posts relating to noise I could find, sorry if this was posted/asked before.

author: Kleinstein
author_rank: Super Contributor
timestamp: May 07, 2019, 06:02:36 pm
content: The text sounds a little like the product is not EMI tested (maybe just not certified) for the suitable emission grade for home environment. This is a little odd for an instrument you want not to interfere with other instruments. This is not spreading much confidence. Ideally I would want a meter to be very low EMI emissions - way better than the normal limits.

author: genghisnico13
author_rank: Regular Contributor
timestamp: May 07, 2019, 07:47:26 pm
content: Wouldn't surprise me, this is taken from the R&S RTB2004 Manual:Quote

author: rsjsouza
author_rank: Super Contributor
timestamp: May 08, 2019, 04:57:34 pm
content: Lab equipment can be classified in a way to not require to meet limits for unintentional radiators (the famous FCC part 15 subpart B), although I agree that a RF spewing device would be quite undesirable depending on what you want to measure. Buyer beware.Keithley 2100 series is a rebadge of a chinese design, thus the manufacturer may have required to publish their CYA message.

author: exe
author_rank: Unknown
timestamp: May 08, 2019, 05:35:20 pm
content: Interesting, I'd expect more troubles in "industrial areas". Like, from a welding near-by, or big machines, or whatever.So, what's the definition of "industrial area"? Does it include EMI?

author: Kleinstein
author_rank: Super Contributor
timestamp: May 08, 2019, 06:10:57 pm
content: There are 2 different allowed emission level for normal private household use and industrial use. The Industrial use curve allows for more emissions. AFAIK medical use has even lower levels.It could be the actual emissions that are a problem - which would be bad, but it could also be just a missing certification / production testing for the lower limits. Even if the do emit to much for the standard this may be just a single frequency.
Nice UI control program for GPIB power supplies like HP 6627A - Page 1
Forum section: electronics / testgear

author: DC1MC
author_rank: Super Contributor
timestamp: May 07, 2019, 06:36:05 am
content: Hello, I was wondering if anybody developed or knows about a program, app or whatever, to control a GPIB interfaced PS like HP6627A or similar, the controls they are offering on the front panel are OK-isk, but cumbersome, and often some features are available only over GPIB.On the other hand, I have a couple of 10" tablets running Android that are totally collecting dust and I could put one on the desktop to control the PS and maybe other devices.Any ideas are appreciated.Cheers,DC1MC

author: coromonadalix
author_rank: Super Contributor
timestamp: May 07, 2019, 10:32:06 am
content: Your first approach would be to send commands with a terminal program and see how you can control the psusIf you have the service manual or a programming manual, youll see what to sendAnd if you dont have any already made program, build your ownDo you know any programming languages ?? vb, c++ etc ...
Desoldering tip must-haves - Page 1
Forum section: electronics / testgear

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: May 06, 2019, 02:58:40 pm
content: Hi everyone. I just ordered a Hakko FR-301 desoldering tool, it uses the N61 series of tips. Do you have any recommendation on the must-have tip sizes that I should get?I notice there's been little discussion on must-have desoldering tip size/shapes for occasional use, so I thought I would start a thread on this subject.Thanks in advance for all your kind advice.

author: helius
author_rank: Super Contributor
timestamp: May 06, 2019, 04:13:36 pm
content: As long as you have one each of the standard sizes 0.8mm, 1.0mm, 1.3mm, 1.6mm, and cleaning pins for each you should be all set.

author: Shock
author_rank: Super Contributor
timestamp: May 07, 2019, 02:07:26 am
content: Quote from: NoisyBoy on May 06, 2019, 02:58:40 pmMatch the desoldering tip to the hole and land/pad size and you're done. Different desoldering tips can be generally categorized:Performance - extra mass for high thermal mass joints.Standard - common through hole sizes.Precision - smaller than standard through hole.Long - for access problems.Flat faced - flat surface for land prep.Special - everything else.

author: james_s
author_rank: Super Contributor
timestamp: May 07, 2019, 05:16:57 am
content: I have two tips for mine, 0.8mm and 1.3mm, both are the standard conical type. That's all I've ever needed, you can use a bigger tip on a smaller pin in most cases, I only change to the 0.8mm tip when I'm pulling things like DIPs from double sided PCBs.
Opinion on best LCR meter for $200 or less? - Page 1
Forum section: electronics / testgear

author: MatCat
author_rank: Frequent Contributor
timestamp: May 08, 2019, 07:42:26 pm
content: I am looking to get an LCR meter with a budget of $200, what is everyone's recommendation?

author: DaJMasta
author_rank: Super Contributor
timestamp: May 08, 2019, 07:46:40 pm
content: The default recommendation is the DER DE-5000, and it's a good one. About half your price with no extras and comparable performance to meters for the next hundred or two above your budget.

author: MatCat
author_rank: Frequent Contributor
timestamp: May 08, 2019, 08:29:21 pm
content: Awesome, that looks like a great meter and meets my needs! Anyone know of any US distributors?

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: May 08, 2019, 08:49:20 pm
content: Nothing on their website, I just got mine from Amazon last week. Just look for a seller with good review, and ideally Amazon fulfillment. Meter arrived a week after order.

author: TWMIV
author_rank: Contributor
timestamp: May 08, 2019, 09:45:49 pm
content: I purchased one about a year and a half ago from a Japanese seller on eBay. I just looked again and there are quite a few still from Japanese eBay vendors and only one available in the USA with a significant price increase. Shipping took about 2 weeks.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: May 09, 2019, 03:37:22 am
content: Beware of what's included. I did look at ebay as well, most of the lower cost seller only sells the meter, you need the cable kits for it to be functional. When you look at the pricing for the kit, the ebay price is only a couple dollars lower.Consider the long ship time, as well as potential custom duties, I decided that I'd rather pay a couple bucks more to get it from Amazon, especially when Amazon handles the fulfillment itself.

author: DaJMasta
author_rank: Super Contributor
timestamp: May 09, 2019, 04:33:09 am
content: Definitely worth getting some attachments, but it is perfectly usable without cables if you just stick through hole parts into the terminals on the front. I'd get the alligator leads and the tweezers for sure, probably don't need the battery adapter since the battery life is pretty good.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: May 09, 2019, 05:03:31 am
content: Agree on the 9V power supply, I thought it was way over-priced for what you get, most of the kits I saw does not include that.I still have to get used to the super short lead on the alligator clips, and I am starting to really like the idea to upgrade it to the longer Kelvin clips.
GDS-1054B not accessing usb drive - Page 1
Forum section: electronics / testgear

author: ttyridal
author_rank: Contributor
timestamp: April 25, 2019, 06:56:57 pm
content: Playing around with a new GDS-1054B from GW Instek, I'm unable to read / write to the usb drive. The scope recognises the drive and file utilities presents the usb: folder, but there are no files.If I save something (on the scope), it's storedsomewhere, but not on the usb drive - back on the pc there are no new files. If the drive is reinserted into the scope the files are there.in short, it looks like the gui presents another folder than where the thumbdrive is mounted !?Where did I go wrong?firmware 1.23tried thumbdrives formated to fat, fat32 and exfat.-T

author: Mortymore
author_rank: Frequent Contributor
timestamp: April 25, 2019, 08:13:01 pm
content: You are probably storing the files in the internal scope memory, not in the USB stick. (see page 166 forward in the manual)If you have a USB drive inserted, in the the scope File Utilities, if go all way to root, you should see 2 drives: Disk and USBGuess you may find the files you've been recording in the Disk folder. Check if that's the case.EDIT: attached a screen capture were you can see on top the path of the file "Disk:/DS0008.PNG" meaning that the file is stored in the internal scope memory Disk, and not in the USB drive.

author: ttyridal
author_rank: Contributor
timestamp: April 26, 2019, 03:20:17 am
content: Unfortunately, no.. I'm definitively on the usb: drive. (i've been back and forth to the root to be sure).-T

author: nctnico
author_rank: Super Contributor
timestamp: April 26, 2019, 04:02:57 pm
content: Did you try a different USB drive? And if possible a good quality one. The cheap ones are often flaky.

author: Mortymore
author_rank: Frequent Contributor
timestamp: April 26, 2019, 05:48:46 pm
content: I have some USB drives that I know that work in my 2000E. One is 1 GB very old pen of unknown brand, and two 16Gb Sandisk, one of them USB 3.0 Ultra-Fit CZ43, theother 2.0 Cruzer-Fit CZ33 bought especially be connected to the scope, both very tiny.All this drives are FAT32 formatted, and without software locks of any kind. You may have an hidden partition of some sort that Windows is unable to access.Or you have bad luck with the drives, having some incompatibility issue.PS: Just tested a 4GB Kingston NTFS format, to no GO (expected). Later formatted to FAT32, still no GO. Scope says "USB format can't support." and the pen LED keeps flashing.

author: ttyridal
author_rank: Contributor
timestamp: May 04, 2019, 08:20:26 pm
content: had to get back home to retry this..I've now tried a fresh out of the plastic sandisk (same brand/type as as the first one) and this one is workingis it possible that there are some incompatibilities with usb-pens formatted on MacOS ?

author: ttyridal
author_rank: Contributor
timestamp: May 06, 2019, 04:08:27 pm
content: Removing the gpt partition MacOS creates by default did the trick.
Determine Year of Manufacture from Serial number on Vintage Fluke DMM? - Page 1
Forum section: electronics / testgear

author: mogazi
author_rank: Newbie
timestamp: May 06, 2019, 02:38:12 pm
content: Hello all,Weird newbie question. I'm looking to buy a vintage Fluke DMM; I know the RCA chip inside can provide a rough indication to the year of manufacture (at least of the IC) but is there any way to determine the year form Fluke's own serial number?The seller sent me this snapshot:It's one of their Dutch made models and I guess it would have to fall somewhere between 77' and 84'... But where exactly?Any help appreciated!
tek tds3032B nvram - Page 1
Forum section: electronics / testgear

author: pasta2018
author_rank: Regular Contributor
timestamp: May 06, 2019, 08:47:02 am
content: HiI have got a tds3032B, it seems that the DALLAS nvram ds1742w-120, low battary, I changed a new one ,but there maybe some data in it, can anyone can share the data in this nvram, thanks!
Best anti-static packing material for shipping an IC - Page 1
Forum section: electronics / testgear

author: 0culus
author_rank: Super Contributor
timestamp: May 05, 2019, 07:54:46 pm
content: I need to ship an unobtainium custom HP DIP package IC, and since it is unobtainium, I'd like it to arrive intact and working. What's the best source of appropriate packing (foam for the legs, anti static bags, etc) for this?

author: DaJMasta
author_rank: Super Contributor
timestamp: May 05, 2019, 08:04:33 pm
content: Quote from: blueskull on May 05, 2019, 07:59:55 pmOr the plastic box version of it. Good foam and an antistatic bag would be plenty, though hard sided shipping containers are a plus. Beyond that, it depends much more on handling on either end than shipping materials.

author: 0culus
author_rank: Super Contributor
timestamp: May 05, 2019, 08:10:03 pm
content: I unfortunately don't have a particular reason to order from mouser, etc right now and I don't have any of their packing materials on hand. I'm wondering where I can buy some, from a reputable seller.Quote from: DaJMasta on May 05, 2019, 08:04:33 pmI understand, I will be taking all precautions, but I'm a bit paranoid given that I've had a couple of things sent to me be victims of shipping mishaps recently.

author: tautech
author_rank: Super Contributor
timestamp: May 05, 2019, 08:25:13 pm
content: https://www.amazon.com/MULTICOMP-038-0016-FOAM-CONDUCTIVE-piece/dp/B00871LQFMLine your IC drawers and boxes with it too.

author: 0culus
author_rank: Super Contributor
timestamp: May 05, 2019, 08:55:23 pm
content: Quote from: blueskull on May 05, 2019, 08:20:48 pmExactly what I was looking for. Thanks! Worth buying some of their stuff in quantity to have on hand I think. One of their IC shipper boxes securely bubble wrapped inside of larger box should suffice.
ICP supply options for sensors connecting to soundcard - Page 1
Forum section: electronics / testgear

author: trobbins
author_rank: Frequent Contributor
timestamp: April 16, 2019, 02:20:08 am
content: I have lucked on a HP 3560A analyser and a range of sensors and their interfaces and calibrators (was a Philips instrument pack for setting up an electron microscope). I aim to connect the sensors to a USB soundcard (EMU0404), as the HP analyser is not as easy to capture measurements from, and has a limited dynamic range (circa 60dB).The Bartington MAG-03 sensor comes with an interface, and the two ACO microphone/preamps come with an interface, but the two PCB ICP accelerometers will need a constant current supply interface (which was provided by the HP analyser as an input setting).Has anyone set up a 317 or low power regulator as constant current source and achieved acceptable noise floor up to about 10kHz? I will likely use a 12V vrla monobloc via a simple step-up dc/dc to provide circa 24VDC, rather than go the multiple 9V battery option to provide power for the CC regulator. I can't locate a HP analyser schematic to identify what 4mA/20V circuitry it uses.My 393A03 accelerometer has circa 7uVrms noise floor (based onhttp://semimac.org/wp-content/uploads/2016/03/sem.org-IMAC-XX-Conf-S27P01-Measurement-System-Noise-.pdf), and 353B51 datasheet indicates it will be noticeably higher noise floor. The linked paper indicates a commercial ICP supply should typically achieve a noticeably lower noise floor than the sensor.

author: trobbins
author_rank: Frequent Contributor
timestamp: April 16, 2019, 03:34:48 am
content: Rod Elliot to the rescue - I think I will go the bjt way.http://sound.whsites.net/project134.htmThe sensors have +/-5Vpk output rating, so the back-to-back 5V6 clipping zeners should remain benign, and the EMU0404 can manage that input level.

author: trobbins
author_rank: Frequent Contributor
timestamp: May 05, 2019, 02:02:54 am
content: I made up a simple ICP 4mA constant current powering interface and it works a treat. Link to doc for more details.https://dalmura.com.au/static/ICP%20Powering%20interface.pdf
Hantek 365C/D/E/F , logging without computer/device? - Page 1
Forum section: electronics / testgear

author: ckambiselis
author_rank: Regular Contributor
timestamp: May 03, 2019, 09:23:42 am
content: Does anyone use any of the Hantek data loggers that have the built-in battery, I would like to know if it is possible to Start the aquisition and then disconnect from it and leave it logging for a few days, can't see anything mentioned about memory size on the specs or anything like that in the manual?ThanksOscar
6G Digital Programmable Attenuator 60DB Step 0.25  - Page 1
Forum section: electronics / testgear

author: Commander_Spock
author_rank: Contributor
timestamp: April 07, 2019, 11:32:17 pm
content: just bought this gizmo from ebayi stopped buying this kind of things because their software is downloable from baidu only but it is nearly impossible to create an account on these servers...i tried to contact this merchant and he sent me a url where i had been able to download the software easily BEFORE i buy this gizmo... this software is available athttps://www.adrive.com/public/kar3TH/ATT20181124.zipi also try to attach this small downloaded software to this post but unsure it will work... maybe that could help somebody ?the url on ebay for this gizmo is :https://www.ebay.com/itm/New-OLED-6G-Digital-Programmable-Attenuator-60DB-Step-0-25-RF-Module-Case/263584092135

author: tsman
author_rank: Frequent Contributor
timestamp: April 07, 2019, 11:58:58 pm
content: The app is called ATT presumably for attenuator but bizarrely they're also using the AT&T "death star" logo. They include a JPG of the logo including the AT&T text as well.Even if they didn't supply the app, you could make a replacement very easily. It appears as a serial port and they describe the protocol on the auction page. It is very simple with only two commands where "r\n" returns the model number and "wvXXYY\n" sets the attenuator to XX.YYdB.

author: Electro Fan
author_rank: Super Contributor
timestamp: May 04, 2019, 01:43:18 am
content: So did it work? If so, how well?Quote from: Commander_Spock on April 07, 2019, 11:32:17 pm
first time buyer oscilloscope advice  - Page 1
Forum section: electronics / testgear

author: njkmonty
author_rank: Contributor
timestamp: May 06, 2019, 10:21:19 am
content: After researching online i came across the popularity of the Rigol DS1054Z Oscilloscope.but thought i may get some input from those knowledgeable in the area.At this stage my only real desire to get an Oscilloscope was tocalibrate delay based pedals BBD analogue chips mn3002/3007/3005 etcafter building an ada flanger and memory man delay i wondered about any improvementgained from proper calibration.I dont mind saving for a good piece of equipment however if im only after for a simple purposeare there other options that anyone can suggest?also im not working on mains voltage , 15+/- is the mosti see all these different options on ebay etchandheld devices etc etccan anyone point me in the right direction?

author: nctnico
author_rank: Super Contributor
timestamp: May 06, 2019, 10:49:33 am
content: A good alternative for the DS1054Z is the GW Instek GDS-1054B which costs about the same. When hacked (using a simple key generator) it has better specs compared to the Rigol 1054Z.

author: njkmonty
author_rank: Contributor
timestamp: May 06, 2019, 10:50:00 am
content: cheers

author: Fungus
author_rank: Super Contributor
timestamp: May 06, 2019, 11:18:51 am
content: Quote from: nctnico on May 06, 2019, 10:49:33 amThose are the two options that are the minimum you can really spend and get something worth having in a 'bench oscilloscope'. Both will do the job, both can be hacked to get more features (although the Rigol usually comes with most features unlocked these days).If all you want is to look at guitar pedals at the heapest price then you might get away with something like aDSO Quad. I wouldn't recommend one for heavy usage because the user interface is horrible but they show a couple of wiggly lines on screen up to about 10MHz, no problem.

author: TK
author_rank: Super Contributor
timestamp: May 06, 2019, 12:03:45 pm
content: For around $250 you have the OWON SDS1102 100MHz 2 channel scope. Much better than the DSO Quad.

author: njkmonty
author_rank: Contributor
timestamp: May 06, 2019, 12:06:45 pm
content: and it appears to have a 7" screen

author: Gyro
author_rank: Super Contributor
timestamp: May 06, 2019, 12:33:28 pm
content: @njkmonty:From the above scatter replies, it looks as if you need to give more detail about how much you ideally want to spend, how much "saving" will be involved, any future change (increase) in requirements etc.There are several options, at several different price ranges, coming out at the moment.

author: Fungus
author_rank: Super Contributor
timestamp: May 06, 2019, 12:38:24 pm
content: The Owons look good in adverts but they haveverylimited features.