hybridfree/eevblog-posts huggingface dataset:
Aneng AN819A Multimeter Review, Teardown, & adjustment - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: March 12, 2019, 04:42:15 am
content: The Aneng AN919A is large inexpensive 2000 count multimeter with an excellent large display, but with accuracy issues and very cheap test leads. I bought it because after watching many excellentBig Clive videosI wanted a fixed range meter with a large easily readable display for my own videos.The display is excellent, but the meter was on the razor edge of it's specified accuracy. I found a pot inside I used to adjust it much closer, but given the sensitivity of the pot I was it took some time to get close. It should be a multi turn pot, but not to be at this price point.It is about what I expected. The display is very nice for a cheap meter. I would not pay more than I did for one of these.I gotthis one from Banggoodfor $9.50 delivered. It was a full two months from the time I placed until I received it. It was put on slow boat.input characteristics:V Range - R in200mV DC - 498K ohms2V DC - 9.46M ohms20V DC - 9.91M ohms200V DC - 9.91M ohms100V DC - 9.91M ohms750V AC - 9.91M ohms200V AC - 9.91M ohms20V AC - 9.90M ohms2V AC - 986K ohms200mV AC - 984K ohmsI Range - R in20mA AC - 13.7 ohms200mA AC - 4.76 ohms20A AC - 0.02 ohms20A DC - 0.02 ohms200mA DC - 4.76 ohms20mA DC - 13.7 ohmsR range - short currentcontinuity/diode - 1.42mA200 ohms - 328µA2K ohms - 228µA20K ohms - 49.4µA200K ohms - 5.55µA2M ohms - 561nA20M ohms - 58nA200M ohms - 3.02µAclick on the images below for the full sized version

author: ModemHead
author_rank: Frequent Contributor
timestamp: March 12, 2019, 03:45:52 pm
content: Thanks for the review and teardown. I think you'll find an ICL7106 clone chip under the blob. And no, the meter cannot directly measure it's own power source. You should find that the analog ground (COM jack) is regulated at 3V below the positive battery terminal. Connecting this node anywhere else inside the meter is not a good idea.BTW, it would be helpful to improve your camera's focus, maybe engage auto-focus?

author: Fungus
author_rank: Super Contributor
timestamp: March 12, 2019, 06:44:38 pm
content: Edit: Posts about new ANENGs movedhereso as not to hijack your thread.It also makes the comment below quite esoteric.

author: coromonadalix
author_rank: Super Contributor
timestamp: March 12, 2019, 08:21:17 pm
content: An experimental meter for experimental tests loll, seems nice, dont know about the continuity sensivity ??

author: graybeard
author_rank: Frequent Contributor
timestamp: March 13, 2019, 07:06:44 am
content: Quote from: ModemHead on March 12, 2019, 03:45:52 pmMy camera is a Nikon D750 DSLR. It is a great DSLR for stills, but the autofocus in video mode sucks. That's why I was using manual focus.I think next time I will stop down a bit more for more depth-of-field.
About Brymen BM235 EEVBlog 2019 - Page 1
Forum section: electronics / testgear

author: DenisSaiz
author_rank: Newbie
timestamp: March 13, 2019, 04:19:54 pm
content: I'm a little confused. I got a multimeter 2 days ago. And immediately put it into my existing probes. And found that they dangle it. When not credible. I want to ask people who own the farthest meter. Do you have probes from other multimeter tightly inserted? very strange situation ...
What sort of oscillator inside DG1022Z? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: March 10, 2019, 08:26:49 am
content: I have a Rigol DG1022Z function generator and it’s quite good enough for everything I do. What I want to know is, what sort of frequency reference does it have. TXCO? Something fancier? Also, has someone done a teardown on one of these?

author: WhichEnt2
author_rank: Regular Contributor
timestamp: March 10, 2019, 09:09:38 am
content: https://www.eevblog.com/forum/testgear/rigol-dg1032z-teardowns-(china-review)/Teardown of dg1032z.

author: bd139
author_rank: Super Contributor
timestamp: March 10, 2019, 10:04:35 am
content: I reckon it's a TCXO and it's very stable. I had mine driving my two OCXO equipped Racal counters and it didn't budge even 0.1Hz in over 3 hours.

author: David Hess
author_rank: Super Contributor
timestamp: March 10, 2019, 05:39:11 pm
content: Quote from: Circlotron on March 10, 2019, 08:26:49 amDo you need better stability or better phase noise?The phase noise of DDS function generators tends to be very poor simply because it is considered unimportant in most applications which would use a function generator so steps are not taken to minimize it. Stability only depends on the reference oscillator.

author: bd139
author_rank: Super Contributor
timestamp: March 10, 2019, 05:40:51 pm
content: Phase noise is exceptionally good on the DG1000Z series.I’d assume stability for the OP.

author: Circlotron
author_rank: Super Contributor
timestamp: March 10, 2019, 11:46:46 pm
content: Quote from: David Hess on March 10, 2019, 05:39:11 pmNeither.I’m saying it’s okay as it it.Just wanting to know what makes it tick, literally. 🙂
Hantek DSO5102P FFT cursor issue - Page 1
Forum section: electronics / testgear

author: njswede
author_rank: Newbie
timestamp: March 11, 2019, 05:01:51 pm
content: Hi!I just got myself a Hantek 5102P scope. My first impression is that it's a pretty capable scope. The FFT function works fine once you get the hang of it and work around a few quirks (like the fact that there's no easy way of setting the span).One thing though, when in the FFT mode, the frequency cursor is off. It seems to be more off the higher the frequency. Check the attached image. I'm sending in a 623kHz signal. The frequency counter on my generator and the one on the scope agree down to the second decimal. And as you can see, the signal sits smack in the middle at the center frequency of 625hKHz. All well and good so far. But when I use the cursor, it says the frequency is 656kHz. Off by about 30kHz! It seems to get worse the higher the frequency is. Smells like a software bug to me. Anyone who's see this and knows if there's a fix?
Isotech IDS-1102b firmware info - Page 1
Forum section: electronics / testgear

author: Gazmon
author_rank: Regular Contributor
timestamp: March 07, 2019, 07:19:29 pm
content: hi all,is there a firmware upgrade for this scope currently thats worth doing , mine has version 1.22 , will the GW instek firmware work from there website with an Isotech branded scope? (there the same product ive read)Would there be any serial decoding etc available with any potential hack for this scope?just seeking clarification, apologies for repeat questions? and thanksGazmon

author: tv84
author_rank: Super Contributor
timestamp: March 07, 2019, 07:29:21 pm
content: Supposedly it's the same scope: ISO-TECH IDS-1102B <=> INSTEK GDS-1102Bhttps://www.eevblog.com/forum/testgear/possible-gw-instek-gds-1000b-hack/msg2007089/#msg2007089

author: Gazmon
author_rank: Regular Contributor
timestamp: March 07, 2019, 07:34:55 pm
content: thanks for you replySeems like thats a lot of coding chat there , can i just flash the firmware from GW?Seems to refer to the 2000E model firmware being suitable for the 1000B is this correct in what i sayIs this a USB Flash? , thanks again

author: tv84
author_rank: Super Contributor
timestamp: March 07, 2019, 07:38:15 pm
content: No! No mixing with the 2000E!The firmware should be the one from 1000B. But I can't guarantee because I've never seen those scopes.

author: Mortymore
author_rank: Frequent Contributor
timestamp: March 07, 2019, 09:43:58 pm
content: ISO-TECH is just a rebrand of GW-Instek from RScheck here:https://uk.rs-online.com/web/p/oscilloscopes/1233753/https://az.rsdelivers.com/product/iso-tech/ids-1102b/iso-tech-ids-series-ids-1102b-digital/8844722So, you can find what you need for your IDS-1000B at GW-Instek website, in the download area (hacks apart)https://www.gwinstek.com/en-global/products/detail/GDS-1000B

author: Gazmon
author_rank: Regular Contributor
timestamp: March 10, 2019, 09:57:48 pm
content: I just noticed there is a Function module` app on there website for the 1000bAnyone knows what this does as there is no information anywhere about its use??

author: Mortymore
author_rank: Frequent Contributor
timestamp: March 10, 2019, 11:38:41 pm
content: I believe that APP is intend to interact with this training/demo boardhttps://www.gwinstek.com/en-global/products/detail/GDB-03
Anybody using a Sanwa EM7000 VOM - Page 1
Forum section: electronics / testgear

author: SG-1
author_rank: Regular Contributor
timestamp: March 07, 2019, 01:47:06 am
content: Thinking about purchasing a Sanwa EM7000 & was looking for some feedback. Reviews are good on this model. On the cheep ones not so good, things like sticking pointers, etc...There does not seem to be any analog meters in the review data base.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: March 07, 2019, 05:16:08 am
content: Can't speak specifically about the EM7000, but the Sanwa YX360TR was the first multimeter I bought when I first got interested in electronics in high school (couldn't afford a Simpson, which is what the electronics lab used). That was over 40 years ago, despite all the high end test gear I worked with through the years, the Sanwa was always my trusty companion at home. Never failed, the needle never got stuck, I still have it in perfect working order. Against a voltage standard, it consistently reads about 1-2% lower, but still within spec.So I would have no hesitation to recommend a Sanwa, assuming they have maintain the build quality.

author: nukie
author_rank: Frequent Contributor
timestamp: March 08, 2019, 08:39:27 am
content: I have an EM7000 made in Japan. The display is exquisite and therefore it's very easy to spot a fake. Gold plated test probes is a nice touch.What do you want to know?

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: March 08, 2019, 02:42:20 pm
content: I agree on the fakes, I was surprised to see how many low end imitators spell their names like Sanwa and with look alike products. Be careful where you get it from, best to buy from a authorized retailer just for the peace of mind.

author: Gregg
author_rank: Super Contributor
timestamp: March 08, 2019, 09:26:19 pm
content: In 1970 I bought a Sanwa analog meter when I was in Japan. I wanted a robust meter that was the best bang for my buck. My Japanese friends all stated that the Sanwa was the way to go. I still have it and it still works as well as either of the two Simpson 360s I own. A genuine Sanwa would be a good choice, especially if it is made in Japan.

author: SG-1
author_rank: Regular Contributor
timestamp: March 09, 2019, 09:56:50 pm
content: Quote from: nukie on March 08, 2019, 08:39:27 amMostly looking for a review, but the search here did not come up with anything thing useful. I then used an outside search engine & found a review here from 2011. When he centered the needle & showed it could then swing either way I was sold. Have one on order from Amazon, if it is a fake they have been pretty good accepting returns, so far.I had an old Radio Shack that I used to get through school, but a drop finished it off a few decades back. Still miss it. In those days no meter had a CAT rating, even the Flukes. I am looking at the industrial Simpson analog meter for that.Any quarks you do not like.
Windows 3.11 or MS-DOS drivers for HP 82341C HPIB Card - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: May 11, 2017, 04:29:23 pm
content: Hi All,I'm hopping someone here on the forum might have these laying around somewhere. I'm trying to bring up an old DOS/Win311 machine to run some old HPIB software using an 82341C card. Unfortunately this software is expecting the HP drivers and it doesn't work with the later versions of the IO Libraries (I've tried several drivers from the G through to 14.0 versions).According to the IO Libraries revision guide, I need to get the B.03.13 version as the version that supports Win311 (or MS-DOS).On the Keysight download center the oldest version available is G.02.02. According to the revision guide the CD for version G had the version B pieces on it but the download package doesn't.Does anyone out there have the original B.03.13 drivers available or even an ISO of the G.02.02 drivers?Thanks,TonyG

author: edpalmer42
author_rank: Super Contributor
timestamp: May 11, 2017, 06:16:00 pm
content: Check the HP Computer Museum.http://www.hpmuseum.net/exhibit.php?swc=8. Note in particular item #69 in the list.EdP.S. Windows V1.03

author: Tony_G
author_rank: Super Contributor
timestamp: May 11, 2017, 06:24:16 pm
content: Thanks Ed - Unfortunately those drivers are for the HP 82335 card and not the 82341.The old HP software I have is actually for Windows 3.0 I think but it works on Win 3.11.TonyG

author: edpalmer42
author_rank: Super Contributor
timestamp: May 11, 2017, 07:44:01 pm
content: Quote from: Tony_G on May 11, 2017, 06:24:16 pmAre you sure? The documentation talks about installing both the 82335 and the 82341.Ed

author: Tony_G
author_rank: Super Contributor
timestamp: May 11, 2017, 07:47:06 pm
content: Yep - I tried installing them and the installer comes back with "No HPIB card detected" and only lists the 82335 in the screen title.I think the documentation is from a later product than the actual disk images.TonyG

author: pelule
author_rank: Frequent Contributor
timestamp: May 11, 2017, 10:13:26 pm
content: Did you install the dlportio driver, as recommended in the HPDir project description (attached as PDF)?/PeLuLe

author: Tony_G
author_rank: Super Contributor
timestamp: May 12, 2017, 02:24:09 am
content: Thanks Pelule - Appreciate the comment.I'm not running a HP Tape Drive which is what this seems to refer to. The driver package from HPIBTOOL has a DOS based installer which specifically refers to a different HPIB card than the one I have (82335 instead of the 82341).So I don't think that has anything to do with what I'm looking for.TonyG

author: MateKrisz
author_rank: Regular Contributor
timestamp: March 09, 2019, 04:30:55 pm
content: Hi Tony,I have the same problem. Finally, do you found the correct files?Regards,

author: Tony_G
author_rank: Super Contributor
timestamp: March 09, 2019, 08:24:37 pm
content: I did end up finding the B version -https://1drv.ms/u/s!Amqar8_XQ9Uzkacvjkfsdl4PV1mZtgTonyG
Uni-Test UT333 relative humidity meter (mini review sort of) - Page 1
Forum section: electronics / testgear

author: mzzj
author_rank: Super Contributor
timestamp: August 20, 2018, 02:27:40 pm
content: Wanted inexpensive humidity meter for garage and general fooling around so decided to give a try for the new UT333 I had seen in some advertisement:http://uni-trend.com/productsdetail_1454_985_985.html+Suprisingly good accuracy and response time, well within 1%RH when checked with 11% 33% and 75% calibration salts. Response time couple of minutes to within 2%RH (many cheapo humidity meters/sensors have horribly long response time, settling to final value 3%RH can take several days)+auto-power off can be disabled+inexpensive (about 15-20 USD from ebay) (Fluke 971 is pretty similar with 300 usd price tag)+reasonably solid construction+- limited battery life, about 4-6 months without auto-power-off- sensor is not "isolated" from rest of the casing, annoying with some humidity calibrators as you would need to place the entire meter inside the test chamber, not just the sensor.And you can't get accurate readings by just plugging the sensor part to a hole in HVAC duct because air can circulate freely from sensor part to rest of the insides of the meter (and went from battery lid/seam)

author: Kabasva
author_rank: Contributor
timestamp: March 09, 2019, 05:47:50 pm
content: https://www.wikihow.com/Test-a-Hygrometer
LCR-TC1 chinese LCR/Transistor tester troubles - Page 1
Forum section: electronics / testgear

author: TinkeringSteve
author_rank: Frequent Contributor
timestamp: March 06, 2019, 08:25:56 pm
content: For some reason, there seem to be some people on the net who seem quite happy with that little stinker here:I got my second one now, and hey, at least it has a different failure mode...The first one shows only rubbish ("dirty snow" with similar pattern every time) on screen, but the tested LED flashes a bit when it's doing that.Now the supposed replacement does one measurement, manages to show the result for 1..2 seconds, and then the screen fades darker to off within a second or so, and the next time I press the button, the LED will flash, but the screen remain dark.And if I then connect the USB charger, the charging LED will show red again, although I let that sucker charge over night.How many times do I need to try until I get an actually working one, on average?Or are there quick fixes to maybe known problems?(2nd sounds like battery is DOA, since they let me keep the 1st one, I might swap it, but if the problem is other rubbish parts or bad assembly, ... )(my older USB-only china tester with no battery works like a charm, but it can measure fewer things than this, so I thought I upgrade, but no...)

author: TinkeringSteve
author_rank: Frequent Contributor
timestamp: March 09, 2019, 04:16:40 pm
content: Ah allright, there is a thread about that gadget on here from last year:https://www.eevblog.com/forum/testgear/tc1-lcr-meter-transistor-tester-fix/Symptoms don't sound exactly like mine, but then there's this monstrous thread from some years back:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/2225/didn't see it at first. Looks like I need to comb through that.Unless someone sees this who recognizes the problem and can give me pointers?(hundreds of pages,)I could also just try to complain at the ebay seller with rented storage area in europe to send me yet another one... but if those things just are made with crappy components that needs replacement sooner or later... (I am getting rather weary of communicating with them, like Chinese sellers tend to do, they make it quite draining)

author: madires
author_rank: Super Contributor
timestamp: March 09, 2019, 04:56:10 pm
content: ST7735 based LCDs start with a snowy display when not cleared before turning the display one. If the display stays snowy there could be something wrong with the firmware or signal lines. The issue of the second unit might be caused by a power problem. Check the MLCCs and Schottky diode for the Zener test voltage.
UNI-T UT139E negative intrinsic capacitance... - Page 1
Forum section: electronics / testgear

author: Manx
author_rank: Contributor
timestamp: March 09, 2019, 05:01:28 am
content: I can't measure small capacitors with my UT139E. It shows 0.000 nF. I thought it's some mysterious inability to deal with small capacitance. But when I tried to determine the lowest measurable value, it turned out the meter systematically measures about 200 pF too low. So anything less is just zero. Does anyone have any idea how to calibrate this?

author: HKJ
author_rank: Super Contributor
timestamp: March 09, 2019, 07:15:13 am
content: Can you remove it with the "REL" button?Another way is to measure a 1nF capacitor first, then put the pF capacitor in parallel with the 1nF and measure again.

author: supercilious
author_rank: Contributor
timestamp: March 09, 2019, 12:34:59 pm
content: I just checked on my UT139S (which is AFAIK identical to the UT139E except the white on black screen) and it reads a fluctuating 12-26pF with the probes shorted depending on how I hold them. I'm using the eBay cheapie gold tipped probes here rather than the included ones. The reading is noisy, but I can measure a 150pF ceramic capacitor as ~0.162nF which seems reasonable.

author: Manx
author_rank: Contributor
timestamp: March 09, 2019, 04:24:12 pm
content: Thanks.I cannot do anything with the REL button. I guess that since the meter normally shows zero, and not a negative value, using REL just subtracts this zero, so nothing changes. It seems that my (particular?) device not only compensates for its intrinsic capacitance, but it also over-compensates. Adding 220 pF cap helps. Then I can measure even single digit pF caps.So another question is: would soldering the additional cap inside the meter affect other measurements? (like V_AC or Hz, which are on the same socket?)

author: supercilious
author_rank: Contributor
timestamp: March 09, 2019, 04:54:54 pm
content: Quote from: Manx on March 09, 2019, 04:24:12 pmI would strongly advocate against any modification like that, even if safety was not a concern.I just looked up a teardown online, and there is an 8 pin SOIC chip on the board that almost certainly contains the calibration data. Looking at the part number, it is a 24C02 I2C EEPROM. I would start by poking at the values in there (after making a backup of course) to see if I can improve the results. The datasheet of the DMM chip might even tell you exactly which values you need to change to get the desired result.
Keysight U1333A DMM? - Page 1
Forum section: electronics / testgear

author: gutbag
author_rank: Newbie
timestamp: March 09, 2019, 11:02:13 am
content: I've been entering the daily Keysight 'Wave 2019' draw for free instruments and received an email telling me that I have won a U1333A DMM. This model doesn't seem to exist. It could be an as-yet unlaunched model, and they're trying to raise interest by giving some away, but, being a suspicious type, I thought I'd check. Has anyone heard of it?Thanks.

author: Cnoob
author_rank: Regular Contributor
timestamp: March 09, 2019, 11:56:13 am
content: Congratulations on winning I think it could be a typoand it should read Keysight U1233Aall their DMM start with U12, I own a U1242C and they go up to U1282A

author: gutbag
author_rank: Newbie
timestamp: March 09, 2019, 02:18:03 pm
content: Thanks, you're right. My name has just appeared in one of their videos, confirming that it's the U1233A.
Siglent 1202X-E Serial Decoding not working - Page 1
Forum section: electronics / testgear

author: spinnaker
author_rank: Regular Contributor
timestamp: March 08, 2019, 09:28:29 pm
content: Serail decoding does not seem to be working on my Siglent and was wondering what I night be doing wrong. I viewed Dave's video and I think I have everything setup the same but it still does not seem to decode so not sure what I am missing.I am sending an A at 9600 baud async

author: ewaller
author_rank: Contributor
timestamp: March 08, 2019, 10:01:08 pm
content: Under the signal menu, ensure that Rx and Tx are both on channel 1. Also, check your threshold levels are appropriate

author: tautech
author_rank: Super Contributor
timestamp: March 08, 2019, 10:36:45 pm
content: First and foremost ensure you have:Latest firmware V1.3.23Rock solid stable triggeringYours looks OK but a few tips to get it:Set Trigger for falling edge and adjust Holdoff to greater than one packet length.Decode setting to Idle High.USB stick screenshots are the simplest to grab using the blue Print button and give small png files of a few 10's of KBs.We'll get you there with screenshots of your progress, tip; get the various menus in the screenshot so we can see your settings.

author: spinnaker
author_rank: Regular Contributor
timestamp: March 08, 2019, 11:23:29 pm
content: Thanks. Perfect instructions. That did it first time!.I don't know I sort of like the EasyScope Screen shot method. No transferring a USB drive back and forth. This one attached is using the USB drive method. File is a bit smaller.I intentionally used the virtual panel in my first post. I wanted to show the settings. I did not realize Easyscope also has a screen shot mode. And if you do a file save there, the file nice is not as good as the USB drive method but better than taking a Windows screen shot.

author: spinnaker
author_rank: Regular Contributor
timestamp: March 08, 2019, 11:32:37 pm
content: Upgraded firmware version. I am assuming this is what you meant by 1.3.23?

author: tautech
author_rank: Super Contributor
timestamp: March 09, 2019, 12:18:50 am
content: Quote from: spinnaker on March 08, 2019, 11:32:37 pmNow a small exercise now you have Decode sorta sorted.Slow the timebase right down to just above Roll mode so to have several/many packets on the display.Now press the timebase knob to get into Zoom mode and then use the timebase again to select how large/small your zoomed data stream portion is.Doing this you can a heap of packets on the display, all decoded and data visible in the List when it's turned ON.The highlight line is 1/2 way down the list and you can scroll though it with each decoded line time referenced in relation to the trigger point.Once you get into advanced triggering with the Decode trigger suite, again each line is time referenced WRT the trigger point.Have fun.
AWA F242A - Page 1
Forum section: electronics / testgear

author: Haasje
author_rank: Newbie
timestamp: March 08, 2019, 01:24:01 pm
content: I am looking for AWA F242A distortion meter service manual+ schematic for serial number 255. On the web this can be found, but for serial number 586 and up. This differs too much for me be able to repair my unit. Please help me out!

author: PTR_1275
author_rank: Frequent Contributor
timestamp: March 08, 2019, 04:21:01 pm
content: I just checked my service manual and it’s for 586 onwards too.Mines been in a disassembled state for a long time now because the set ref pot / switch was all gummed up and snapped when I tried to clean it.
Old TCXO data needed - Page 1
Forum section: electronics / testgear

author: IAmBack
author_rank: Regular Contributor
timestamp: March 08, 2019, 11:20:19 am
content: Hi.I've got old TXCO, model JKTCXO-16, by "CTS KNIGHTS, INC". It's frequency is 30MHz.Can someone share info about this unit (voltage, stability and similar)?Regards.
Marconi 6960B Service Manual - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: March 07, 2019, 06:32:54 pm
content: I recently succumbed and bought a Marconi/IFR/AeroFlex 6960B with a 6914 40GHz sensor.I can find a User Manual for the 6960B (courtesy KO4BB.com), but the only Service Manual I can find is for the 6960 which pre-dates the 6960B.Is there a scan of the 6960B Service Manual anywhere?ThanksDavid

author: picburner
author_rank: Frequent Contributor
timestamp: March 08, 2019, 09:37:17 am
content: Telford Electronics has it, I bought it there.
RIGOL DS1054Z firmware 00.04.04.SP4  - Page 1
Forum section: electronics / testgear

author: W100
author_rank: Newbie
timestamp: March 15, 2019, 06:00:31 am
content: RIGOL DS1054Z. Firmware from delivery 00.04.04.SP3. All Options are open.100 MHZ no. Have installed firmware 00.04.04.SP4. I want to do 100 MHZ. Invalid license. Help. RIGOL company woke up? Sorry for my bad English.

author: t_i_t_o
author_rank: Contributor
timestamp: March 15, 2019, 08:20:52 am
content: Just updated one DS1Z to 100MHz. Double check the serial number you entered and everything should be fine.

author: W100
author_rank: Newbie
timestamp: March 15, 2019, 01:07:20 pm
content: Checked several times. Can you roll back to the old firmware?

author: newbrain
author_rank: Super Contributor
timestamp: March 15, 2019, 01:36:01 pm
content: Quote from: W100 on March 15, 2019, 01:07:20 pmNot easily.But there's been no report of the new FW preventing the unlocking (and updating an already unlocked scope works, IME).It would seem very strange to close the stable doors 5 years after this horse has bolted...Things to check:Have you tried only theweb siteor also downloaded and used the binary? Some people got different results, AFAICR.Have you used the DSER code? Do not use DSFR!Did you try unlocking via SCPI (over telnet/USB)?All this and more is described and linked inthis post

author: W100
author_rank: Newbie
timestamp: March 15, 2019, 03:03:11 pm
content: newbrainThank you!Used only DSER.No unlocking via SCPI (over telnet/USB).I will try. After all report.

author: W100
author_rank: Newbie
timestamp: March 15, 2019, 03:30:24 pm
content: Thank you very much. 100 MHZ works. My bug: there were dots after the serial number.

author: Housedad
author_rank: Frequent Contributor
timestamp: March 15, 2019, 05:38:14 pm
content: You added the dots? That is why it did not work at first?

author: W100
author_rank: Newbie
timestamp: March 17, 2019, 10:36:22 am
content: No. They just stayed at the end, I didn't delete them.
No Bounce Mechanical Relay for ESD testing - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: March 07, 2019, 02:16:26 pm
content: I need to build a low (<500V) voltage human body ESD tester. I need to find a mechanical relay that does not bounce. So far I have been unsuccessful. I have looked at one Mercury relay, but it splashes which looks electrically like a bounce.Do you have any suggestions?

author: Sylvi
author_rank: Regular Contributor
timestamp: March 07, 2019, 04:13:56 pm
content: HiI believe every mechanical relay ever made will bounce, whether it is an integrarted relay or a reed type, which I don't think will handle the current pulse possible. Although just for reference doesn't the body model include 1k5 of series resistance? That would limit a 500V discharge to 333mA.It would be very simple to use an electronic switch comprised of mosfets. It can be as fast as you want with zero bounce, no microcontrollers, just analog.

author: graybeard
author_rank: Frequent Contributor
timestamp: March 07, 2019, 04:37:37 pm
content: The turn on time of mosfets is too long. The rise time needs to be < 2ns to meet the spec. With work you can get rise times on the order of low 10s of ns, but faster is difficult.We have an old ESD tester that has managed to have a no-bounce relay that works up to 3KV. However me tearing into NIST traceable calibrated equipment to see what was done seems to be frowned upon.

author: capt bullshot
author_rank: Super Contributor
timestamp: March 07, 2019, 04:55:23 pm
content: You should look for mercury wetted reed relays.That's the common go to standard for non-bouncing relay contacts.

author: Smokey
author_rank: Super Contributor
timestamp: March 07, 2019, 05:02:40 pm
content: I was going to say silicon carbide FETs, but it still looks like around 10ns. Bummer.

author: David Hess
author_rank: Super Contributor
timestamp: March 07, 2019, 05:56:31 pm
content: Quote from: graybeard on March 07, 2019, 04:37:37 pmSeries stacked bipolar transistors can handle 500 volts in less than 2 nanoseconds when switched in avalanche mode which may be what they did. The Zetex application note below shows an example of how this can be done.

author: graybeard
author_rank: Frequent Contributor
timestamp: March 08, 2019, 02:16:04 am
content: Quote from: capt bullshot on March 07, 2019, 04:55:23 pmThank you. I found some mercury wetted reed relays that meet my requirements.

author: graybeard
author_rank: Frequent Contributor
timestamp: March 08, 2019, 03:13:02 am
content: The spec is for current rise-time into a short, not voltage rise time.
Serial i2c etc decoding  on a scope that doesn’t support it  - Page 1
Forum section: electronics / testgear

author: Gazmon
author_rank: Regular Contributor
timestamp: March 07, 2019, 06:11:07 pm
content: Hi allHow can I do this on the scope that doesn’t support it , the cheapest way? is it possibleAppreciate and Thanks for any infoGazmon

author: DDunfield
author_rank: Regular Contributor
timestamp: March 07, 2019, 07:02:06 pm
content: Quote from: Gazmon on March 07, 2019, 06:11:07 pmI can think of three ways:1 - 0$: Look at the signals and manually work out the I2C translations, figuring out the binary data being transferred. (I've done this and it's painful).2 - 0$: If your scope supports it, save the captured data to a USB stick or PC, then write a program to decode it. (Also done this)3 - $10: Download Sigrok, Buy an 8-bit "Saleae" clone logic analyzer on Ebay, connect the logic analyzer in parallel to the scope leads (using level converters if needed), then capture and decode the transactions using Sigrok. Hnit: You can save some power by turning the scope off.Dave

author: David Hess
author_rank: Super Contributor
timestamp: March 07, 2019, 08:11:50 pm
content: Quote from: DDunfield on March 07, 2019, 07:02:06 pmYou get used to it. I don’t even see the samples. All I see is blonde, brunette, red-head.
Fluke DMM switch - display contact material  - Page 1
Forum section: electronics / testgear

author: wertyu
author_rank: Contributor
timestamp: March 07, 2019, 02:34:03 pm
content: sorry i dont know what it is its a contact foam or sponge they use to fit displays and some switches , where can i buy some ? whats it calledthanks

author: wertyu
author_rank: Contributor
timestamp: March 07, 2019, 04:27:20 pm
content: found then !
Agilent E7495A software - Page 1
Forum section: electronics / testgear

author: krulls
author_rank: Contributor
timestamp: March 07, 2019, 03:13:57 pm
content: Does anyone have access to the E7495A Performance Verification and Adjustment software that's called out in the service manual? Seems that's the only way to make adjustments. Keysight says it's not available but they will calibrate the unit for $600, more than twice what I paid for it.TIASteve

author: PA0PBZ
author_rank: Super Contributor
timestamp: March 07, 2019, 03:33:09 pm
content: The problem with that software is that you need a very specific list of test equipment that is going to be controlled by GPIB from the PC running the test software, so it is not of much use if you don't have the equipment. Having said that, here you can download the software and have a look (needs a license key)http://cal.software.keysight.com/Also, read this:https://www.keysight.com/upload/cmc_upload/All/TMETutorial_E_02_11.pdf
feeltech fy3200 channel 2 query - Page 1
Forum section: electronics / testgear

author: Gazmon
author_rank: Regular Contributor
timestamp: March 06, 2019, 01:51:40 pm
content: Hi,I have tested channel 2 on this unit and the wave form output from channel 2 of the fy3200 does not change when I press the `wave` button just displays a sine wave all the time?would anyone say this unit might be faultyChannel 1 works finethanksgazmon

author: nctnico
author_rank: Super Contributor
timestamp: March 06, 2019, 01:56:13 pm
content: Did you press the button next to the channel 2 output to select the channel parameters?

author: Gazmon
author_rank: Regular Contributor
timestamp: March 06, 2019, 01:57:50 pm
content: I turned channel 2 button on and off and its sorted it, so seems ok nowthanks for the quick replycould you tell me what general settings on my oscillorscope i need enabled to confirm im reading the coreect measurement values in relation to the adjustments i makei.e im at 1x in the probe setting, i have 100mhz scope, any tips appreciated

author: nctnico
author_rank: Super Contributor
timestamp: March 06, 2019, 02:19:31 pm
content: Frequency and peak-peak measurements should do it (if you tell the oscilloscope what attenuation factor your probes have).
Voltcraft VC165 AC bug - Page 1
Forum section: electronics / testgear

author: Pluscrafter
author_rank: Regular Contributor
timestamp: March 05, 2019, 10:48:14 pm
content: I once had a Voltcraft VC-165 Multimeter that had a wierd bug. When I was in the AC range and measured a 12 Volt DC powersupply I read 24VAC. Shouldn't the meter read 0VAC. But anyways they gave me then a better multimeter that hasn't that bug. Has also saw this bug on a multimeter.

author: Jeroen3
author_rank: Super Contributor
timestamp: March 06, 2019, 08:28:08 am
content: What is you measure AC on a battery?It could be that this meter does not have capacitive coupling for AC measurement.
Keyight 34461 DMM  - Page 1
Forum section: electronics / testgear

author: IconicPCB
author_rank: Super Contributor
timestamp: March 05, 2019, 10:15:54 pm
content: What is Your experience of Keysight 34461 DMM?Are there any issues to be weary of?Where in the eco system would this animal live?

author: DaJMasta
author_rank: Super Contributor
timestamp: March 05, 2019, 10:59:12 pm
content: It's a good meter. As mentioned in the last thread I saw discussing it, the Keithley 6.5 digit most current model probably has a bit of an edge in terms of UI and remote functionality, but the 34461 is a solid meter, I've been happy with mine. If you're coming from a meter with no fancy screen it makes a big difference for change over time sorts of things (measuring tempcos and whatnot), because being able to have the data plotted out on a graph is a really great feature.There was that little thing with the 1kV input rating that, if I remember right, turned out to be a false alarm? It takes a second to boot, but it's not crazy long, and it's plenty responsive in normal use.Not sure what you mean by ecosystem..... it's most easily integrated with other Keysight gear, but it's got your standard front panel and remote operation features and interfaces, so it can play nice with a lot of stuff.

author: EE-digger
author_rank: Frequent Contributor
timestamp: March 06, 2019, 04:13:19 am
content: I've had both the 61A and the 34465A. Trust me, the 34465A is worth the small price difference. Depends on what you're doing but the 34465A has a 1pA resolution on the lowest current range. It also has faster sampling rate and many other differences I can't recall but use.I usually talk to it using the Agilent DMM connectivity utility. If you can find it, this was sort of a marketing blunder that does not time out. Either of these two models would need to be set to responds as 34410A.To support the these models fully, including screen capture, you need the latest version of Benchvue, which will log for an hour or so for free, otherwise not free for long term logging.Benchvue also has a digitize function which is pretty powerful as it captures a defined sample size at up to 5ks/s or 50ks/s with the DIGItizer option ($300 something).

author: IconicPCB
author_rank: Super Contributor
timestamp: March 06, 2019, 05:14:16 am
content: Thanks Digger.By eco system i mean comparable gear from other vendors.

author: TheSteve
author_rank: Unknown
timestamp: March 06, 2019, 05:36:23 am
content: The Digitizer option is now included free with the newest firmware on the 34465A/34470A.
Acoustic cameras, anyone? - Page 1
Forum section: electronics / testgear

author: ixfd64
author_rank: Frequent Contributor
timestamp: March 06, 2019, 06:27:13 am
content: Some time ago, I discovered a tool that would be really cool to have: an acoustic camera. Here's one, for example:https://web2.norsonic.com/product-cat/acoustic-cameraHowever, those things are expensive — even more so than most thermal cameras. That being the case, has anyone here ever used an acoustic camera? If so, got any interesting pictures to share?

author: martin1454
author_rank: Regular Contributor
timestamp: March 06, 2019, 07:33:19 am
content: Never seen them before, but they look awsome! I want one, even though im not sure what I would use it for

author: Brumby
author_rank: Unknown
timestamp: March 06, 2019, 08:41:58 am
content: As it happens, there was a discussion on this subject last year...Making a sound camera

author: mark03
author_rank: Frequent Contributor
timestamp: March 06, 2019, 03:50:02 pm
content: I watched the video of the Korean device in the other thread. Not sure I see the point. Aren't your own ears sufficient for telling where noise is coming from?More interesting, IMO, would be a DIY sound imaging (sonar) setup. Back when I was playing with synthetic-aperture imaging in grad school, I thought it would be great fun to load a cart with a good microphone and digital recorder, then push it along the sidewalk in front of the Beckman Institute, lighting off small firecrackers every six inches, to see what kind of image one could obtain.
Rigol-Tektronix adapter T2R1000, problem with connecting P6247 with DS4024 - Page 1
Forum section: electronics / testgear

author: krisk
author_rank: Contributor
timestamp: February 24, 2019, 02:53:23 pm
content: Hello,I want to connect Tektronix differential probe P6247 to my Rigol DS4024. I check the spec of Rigol-Tektronix adapter "T2R1000", and every thing was fine (both oscilloscope and probe are in the adapter datesheet).Unfortunately when I connect all together, probe seems to be not working. I have check it before with some Tek oscilloscope and it was working fine.For T2R1000 and DS4024 I'm the first owner so they should be also functional. Any idea how to verified scope interface / adapter functionality ?I could also try to connect it to the brand new Rigol MSO7024, but I'm not sure if it is safe( this model is not listed as the compatible scope for adapter).Bellow information regarding my scope Rigol DS4024:SW version (newest) 00.02.03.00.03HW version: 1.2Best Regards

author: krisk
author_rank: Contributor
timestamp: March 04, 2019, 05:49:48 pm
content: I did some investigation and is seems that T2R1000 adapter have correct voltages levels on the TekProbe interface.When I hook up it to the oscilloscope while probe tip is connected to the test signal, I can see that probe works for the short time and the output signal is slowly decreasing its amplitude to disappear eventually.I did comparison between Rigol T2R1000 adapter and Tek 1103 power supply. I noticed that adapter can deliver up to 150mA on each power supply rail and Tek can give 300mA.When i work with Tek TDS3024B oscyloscope (where P6247 is correctly working) probe is warm.I'm suspecting that P6247 is consuming more then 150mA and Rigol adapter is basically not able to work with it or it is jus damagedDoes anybody know what is the Tek P6247 current consumption?
LiFePO4 AA Rechargeable batteries Powering multimeters with them. - Page 1
Forum section: electronics / testgear

author: sotos
author_rank: Frequent Contributor
timestamp: March 07, 2019, 07:07:55 pm
content: Will something go wrong if a power my fluke with these batteries, as they have 3.2 Volt so two of them will be 3.2 X 2 = 6.4 vThe multimeter is powered by 4 X 1.5v = 6v batteries.

author: David Hess
author_rank: Super Contributor
timestamp: March 07, 2019, 08:13:21 pm
content: It should be fine. If the Fluke is damaged by 6.4 volts, then it was defective anyway.
Siglent SSG3021X / SSG3032X RF Signal Generator Review and Teardown Video - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: March 04, 2019, 06:01:12 pm
content: Siglent SSG3021X RF Signal Generator Review and Partial Teardown video.This is basically the same as the SSG3021XIQ, SSG3032X and SSG3032XIQhttps://youtu.be/ybUVSNTBHzw
B&M BM2060 leakage current clamp opinions - Page 1
Forum section: electronics / testgear

author: HoracioDos
author_rank: Frequent Contributor
timestamp: March 04, 2019, 03:56:19 pm
content: Hi.Does anybody know something about this B&M BM2060 leakage current clamp? It is good enough for home use?. It's U$50 on Aliexpress. I don't want to spend a fortune for a Fluke or Hioki. Next level would be a CEM DT-9810 or AMECal ST-9810. as far as I can see, they are the same product.https://www.aliexpress.com/item/Hot-sale-SZBJ-BM2060-Professional-leakage-current-test-digital-clamp-meter-Measuring-the-precision-of-the/32869449561.html?spm=a2g0s.13010208.99999999.259.57083c00U6BWh2Thanks in advance
UNIT-UT52 rotary switch - Page 1
Forum section: electronics / testgear

author: Brzi
author_rank: Newbie
timestamp: March 04, 2019, 12:03:02 pm
content: HiToday I´make stupid mistake ...when disasembling my DMM UT52 for cleaning I also disasemble rotary switch and pobably lose one of coper spring pad contacs housed on rotary knob (picture posteed in attachments) My question is if somebody hawe same DMM and post me a picture inside of kno and corect pad location. ?Tank you for jour help best regards

author: sambonator
author_rank: Regular Contributor
timestamp: March 04, 2019, 12:23:54 pm
content: This might not have the same contacts (UT-50)...https://youtu.be/54x2pDc7Zn4?t=316

author: Brzi
author_rank: Newbie
timestamp: March 04, 2019, 12:29:47 pm
content: Quote from: sambonator on March 04, 2019, 12:23:54 pmI'think no atleast in first lookPoslano sa mog Mi A1 koristeći Tapatalk

author: Brzi
author_rank: Newbie
timestamp: March 04, 2019, 05:24:54 pm
content: If somebody have same multimeter pleas take picure of knob and contats pleasePoslano sa mog Mi A1 koristeći Tapatalk
2467 battery, cleaning  precautions - Page 1
Forum section: electronics / testgear

author: jonpaul
author_rank: Super Contributor
timestamp: March 04, 2019, 02:47:43 pm
content: Hello all: Just opened a 2467 OPT 06, 10. SN B010xxx. ~3K HRs 150 cyc, Orig A1 U800, A5 thru holeIncredibly it works fine, CAL is OK. This is remarkable for a machine built in 1986, 33 YEARS ago!I plan to recalibrate but for now, just swap out the batteryand hope the CAL is preserved.1/ Battery: Eagle Picher LTC-7PN 3.5V 750mah Keeper date code 2486.Recommended replacement, the many Korea and China seem to be knockoffs.Any source? Prefer plastic or metal cases?Any recommended desoldering precautions?How to replace battery without data loss?2/ Cleaning: in 2 never serviced, accumulated dust and dirt, especially near CRT and vent holes.Should I use air (vacuum cleaner, compressed air or freon air can) to blow out?cotton/Q tips and IPA?Very wary of static or physical damage.Many thanks!Jon
Solved: Controlling an spd3303x PS using python+pyvisa+ni-vi, vxi11 - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: March 03, 2019, 01:27:29 pm
content: It turned out it was simple:You need to instantiate instruments with write_termination = '\n', read_termination = '\n'.Like so:ps1 = rm.open_resource('<string descrbing instrument>', with write_termination = '\n', read_termination = '\n')Then write and read work, but not query.I installed NI-VISA and EasyPower, and I can control the PS thru ni-max as well as thru the scpi panel in EasyPower.I would dearly love to be able to control the 3303X via pyvisa and pyvisa-shell.I can do 'list' in pyvisa-shell, and then 'open 0' to get at the USB connection to the 3303X.However, 'query' anything to the 3303X just makes the power supply beep.Restarting all, power supply and pyvisa, and then doing 'write *IDN?' completed, but 'read' then returned an empty string.Writing any correct scpi at all works, returning success, but no response strings can be read.And doing 'query <SCPI COMMANDS>' makes the 3303X beep and then any 'write' operation makes it beep.NI-MAX can send strings to the 3303X and gets proper strings back.What can the problem be?

author: awallin
author_rank: Frequent Contributor
timestamp: March 03, 2019, 02:11:39 pm
content: Under linux and using Ethernet I recall us using vxi-11 without issues:https://pypi.org/project/python-vxi11/

author: n3mmr
author_rank: Regular Contributor
timestamp: March 03, 2019, 04:57:50 pm
content: Is the 3303X a VXI machine?

author: tautech
author_rank: Super Contributor
timestamp: March 03, 2019, 07:11:56 pm
content: Check out the App notes at the foot of the page here:https://www.siglentamerica.com/power-supplies/spd3303x-spd3303x-e-series-programmable-dc-power-supply/

author: n3mmr
author_rank: Regular Contributor
timestamp: March 03, 2019, 07:34:39 pm
content: Quote from: awallin on March 03, 2019, 02:11:39 pmAfter I found the manual page, this actually worked quite well. ThNks for the pointer!

author: n3mmr
author_rank: Regular Contributor
timestamp: March 04, 2019, 02:57:20 pm
content: This is getting intresting!Tried all the queries available in 3303x scpi, using vxi11+python.*READALL? is interesting!That returns a string with eleven comma separated words.I think they meanUnknown first wordCh1 volt outCh1 curr outCh1 power outCh2 volt outCh2 curr outCh2 power outCh1 volt setCh1 curr setCh2 volt setCh2 curr setSo, what does the first "word" mean?I have so far seen two values of that first word: '4' and '52'.What's up?
Replace Floppy Drive on Agilent E4406A with USB Adapter? - Page 1
Forum section: electronics / testgear

author: RCHRDM
author_rank: Regular Contributor
timestamp: March 03, 2019, 12:05:03 am
content: I have an Agilent E4406A. I would like to replace the installed floppy drive with a USB port. I see there are quite a few of these available online. Would any one of them work, assuming they physically fit in the instrument?Richard