hybridfree/eevblog-posts huggingface dataset:
Picoscope at tequipment... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: August 05, 2017, 12:55:12 am
content: They sent me their clearance ad this morning - if anyone is looking for a 2 channel picoscope, they marked down a single 2207B 27%. I put it in my cart to test if it would let me also do the eevblog discount and it took another 6% off bringing the price down to 340 something. I've got this model and it tests quite a bit better than its 70 MHz rating and it is the least expensive model with the 1 GSa/s sample rate. It is a good deal for anyone looking for one of these; they are not often discounted much.http://www.tequipment.net/Pico/2207B/PC-Based-Oscilloscopes/?v=0

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: August 05, 2017, 05:12:38 pm
content: Picoscope quite often have scopes for auction at reduced prices on eBay.

author: alank2
author_rank: Super Contributor
timestamp: August 05, 2017, 05:33:18 pm
content: Quote from: ralphrmartin on August 05, 2017, 05:12:38 pmOnly on their older models...

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: August 06, 2017, 04:44:24 pm
content: Quote from: alank2 on August 05, 2017, 05:33:18 pmWhich also run the latest software. I got a 200MHz model for £300, with admittedly a low sample rate.

author: JPortici
author_rank: Super Contributor
timestamp: August 06, 2017, 05:16:30 pm
content: and almost no sample memory

author: alank2
author_rank: Super Contributor
timestamp: August 06, 2017, 05:25:11 pm
content: Quote from: ralphrmartin on August 06, 2017, 04:44:24 pmYes, that is something cool about Pico's for sure!The best ones in the 2000 series have a good balance of sample rate, deep memory, and bandwidth)Some stand out to me as being the best value:2206B - the cheapest 2 channel that gives decent performance (50 MHz, 32M memory, 500MSa/s, 2 channels).2207B - the one I mentioned above that there is ONE ON SALE - (70 MHz, 64M memory, 1GSa/s, 2 channels). I've got this model and its bandwidth much better than 70MHz.2406B - the cheapest 4 channel that gives decent performance (50 MHz, 32M memory, 1GSa/s, 4 channels)Note that the 2406B is given the faster 1 GSa/s sample rate even though the two channel model is only 500 MSa/s.

author: MrW0lf
author_rank: Frequent Contributor
timestamp: August 06, 2017, 05:49:57 pm
content: Quote from: ralphrmartin on August 06, 2017, 04:44:24 pmBut with ETS. What software allows? 20GSa/s?Also canuse it as MSOwith external DAC.

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: August 07, 2017, 06:37:50 pm
content: The one I got was a 3206 MSO with 128MSamples

author: MrW0lf
author_rank: Frequent Contributor
timestamp: August 07, 2017, 09:01:16 pm
content: Quote from: ralphrmartin on August 07, 2017, 06:37:50 pmGood score, then you got it all covered w/o trickery
Fluke 80TK Thermocouple Module - Page 1
Forum section: electronics / testgear

author: pigrew
author_rank: Frequent Contributor
timestamp: August 07, 2017, 03:14:52 am
content: I've not seen any photos of the innards of the Fluke 80TK thermocouple module, so I figured that I should post some.The module amplifies a type-K thermocouple voltage to a compensated voltage that can be read with a voltmeter. I bought it so that I can log temperatures using older bench DMMs which don't have temperature modes. This unit is very convenient, though I expect that a "better" one could have been built for the same cost in parts using a thermocouple amplifier IC (such as the AD8495).My particular unit has a copyright 1984 board, perhaps rev N if I can read the stamp.The reference compensation happens via a BJT (2N2484) sandwiched between the thermocouple terminals. It doesn't have good thermal conductance to the thermocouple terminals, but I guess it's good enough.The unit is first calibrated by adjusting two pots (coarse and fine adjustment) to get the centigrade reading right, and then a third pot to correct the Fahrenheit temperature.This unit is an older revision, with the schematic in the attached PDF. I'm also attaching a newer manual which contains a schematic for the surface mount revision of the board. There are minor differences (mostly selecting SMD replacements), but some other tweaks like removing a JFET current-source.

author: pigrew
author_rank: Frequent Contributor
timestamp: August 07, 2017, 04:38:00 pm
content: Extra information:My unit has a standby current draw (at 9V) of 4.7uA. Turned on, it draws 211 uA.The new model seems to have changed how it splits the rails (so that it can output both positive and negative). It's likely that its standby current is different. The op-amp is being powered by -0.5 and 4.5V.Another note is that the screws are Pozidriv #1. Using normal Phillips/cross-drivers is likely to damage both the screw and the driver.
Fluke 871AB Service Manual available? - Page 1
Forum section: electronics / testgear

author: Storm
author_rank: Contributor
timestamp: August 07, 2017, 02:45:53 pm
content: Hi folks,I am new to this forum and hope I have picked the right board for my question...I recently got hold on this Fluke 871AB DC Differential Voltmeter but I cannot find any related documentation on the web.I want to restore the instrument back into specs and also think about documenting the repair in this forum or even make a video... but one step after another.First thing I did was removing this completely dead NiCd-Battery Pack from the instrument before it starts leaking...I did not do anything else so far and I want to get hold of a digital copy of the respective Fluke Service Manual first in order to familiarize with the device.Is there anybody out there that happens to have this manual or knows where I can get one?Did anyone ever hear of this Fluke 871AB or even used it before?Thanks in advance,Storm
CMU200 what to take into account when upgrading with B83 Option - Page 1
Forum section: electronics / testgear

author: markus_jlrb
author_rank: Regular Contributor
timestamp: August 07, 2017, 01:24:15 pm
content: Dears,I would like to insert a CMU-B83 Board into my CMU200.What have I to take into account?Let me in addition ask few questions on this topic.I have attached the hw pice of the Identity.dat file for betterresponse and two pictures from my B83 option.So here my questions:1) Which version is the shown board? Var12 or Var22.2) Is the Version asked in 1) usable for my device.3) Do I need any additional Koax cables?4) Is the B83 board a plain digital board or a mixed with RFblocks on it like oscillators/mixers/gain blocks...5) Is the board able to do different kinds of signaling usable forradio amateurs and not only the CDMA2000 staff.6) Is the B17 option needed by the B83 option or is B83stand alone optin.7) If B83 is stand alone are there any additional features if the B17option IQIF is added to the cmu200.Is the B41 option (audio Generator/Analyzer) needed by B83 or/andB17 optionHopefully someone could give me some info concerning myquestions.Many thanks in advance for your kind help.
Smart Tweezers ST5L - won't turn on - Page 1
Forum section: electronics / testgear

author: Howardlong
author_rank: Super Contributor
timestamp: August 06, 2017, 06:20:44 pm
content: FolksI've had a pair of these Smart Tweezers for a couple of years now, but I've not used them recently because they won't turn on. I already had it apart some months ago, and while I was trying to debug them they suddenly started working again for a few weeks, then they stopped working.When I plug them into a USB port, they take 7mA, but that's it. There's no indication that the battery is charging.So before I reinvent the wheel, has anyone else encountered this behaviour, and if so did you manage to fix it?

author: floobydust
author_rank: Super Contributor
timestamp: August 06, 2017, 06:33:15 pm
content: I would take out the battery and see if it's voltage is OK. Or you wrecked something when you were in thereSmart Tweezers (Advance Devices Inc.) are very good answering technical questions, hit them up.I saw this with a battery too far gone for it to initiate charging.I ended up sending mine back for the firmware update regarding reading MLCC capacitors.

author: Howardlong
author_rank: Super Contributor
timestamp: August 06, 2017, 08:20:19 pm
content: Well, this is what this forum's all about! That's exactly what happened, the cell was at such a low voltage it refused to charge at all. Possibly a design feature that may well be fixed in other models, I don't know).I took it apaaaart, four T6 self tapping screws, and measured the battery voltage, 200mV, so nowhere near enough. I set the lab PSU to 3.7V and current limited 70mA, and poked the battery terminals on the PCB connector. A few seconds of charge and she'd sprung into life. Charging current is 51mA.Underneath there's a single cell LiPo 180mAh, you need to take off two more T6 screws and two Phillps head to access it, but it's not necessary for this process unless you want to change the battery.
DS202 Mini scope - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: August 06, 2017, 12:42:56 am
content: Just picked one of these up off eBay, for $85.https://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=ds202+scope&_sop=15IMO, Fantastic value!!! for a tiny scope to use in the car or shop etc. when you just want to see what's going on with low BW signals.I just watched Dave's very negative review, and I don't disagree with his comments re analogue scopes, however you can't beat this for portability. I will use mine with x10 probes and a dedicated wall-wort when not running floated in battery mode.https://youtu.be/5UXQf5o1q-IThis will be a great compliment to my full featured (read expensive) lab scope. Size of an ipod and it works (a bit better than I expected).I also ordered some x10 probes, will report when they arrive.
Hameg HM604 selling advice - Page 1
Forum section: electronics / testgear

author: picandmix
author_rank: Frequent Contributor
timestamp: August 09, 2017, 09:39:25 am
content: Hi,Just looking for some sound advice on my trusty old Hameg HM604 which I have have since new in 1990, though only lightly used as it was only needed for the calibration of a particular works machine and latterly hobby use.Its in working order with all leads, manual and case, and have tried selling it on a couple of free UK sites with little response apart from one time waster.Even tried to put it for sale on a vintage electronics forum where they were clearly eager for such devices, yet the moderator would not allow it as I was not a regular.Seems you can see the HM604s being sold on ebay for well over £100, though I don't use ebay for selling and am rather reluctant to send such an old instrument via couriers.Equally I'm loathed to sell it for a too low price only to see it being resold soon after, and though expect there are some genuine needy cases for beginners looking for one, as the buy/sell forum shows, many are just taking the wee-wee.Was thinking about £75 collected from near Leeds UK, is that a fair offer ?

author: tautech
author_rank: Super Contributor
timestamp: August 09, 2017, 10:07:15 am
content: Seems very fair to me and this thread should be in the Buy/Sell board.Don't know if you can report your own post and get the thread moved but report mine and ask.Good luck finding a good home for it.
Ex-taech ex 530 knock off, to buy or not to buy. - Page 1
Forum section: electronics / testgear

author: walcen
author_rank: Contributor
timestamp: August 04, 2017, 10:41:28 am
content: Hi guys, in need of another dmm and have just spotted this one on evilbay.http://www.ebay.com.au/itm/New-AC-DC-Voltmeter-Tester-Ohm-Ammeter-Resistance-LCD-Multimeter/111214315919?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l2649It look almost exactly like my Ex-taech ex 530 with relocated dial functions, blue skin and at less than half the price,Any one have any thoughts on it? Or is this where Dave chimes in and say it's too good to be true mate, just buy on of mine, and I am considering buying an EEVblog dmm. but I'm on a tight budget.

author: Muttley Snickers
author_rank: Unknown
timestamp: August 04, 2017, 11:17:19 am
content: It's a 40,000 count CEM meter and I have recommended this particular Ebay listing before as being a fair deal and Jaycar were selling the same meter for an additional $50, for not much more you could also look at Dave's BM-235 which has a lower count but is an overall better meter.

author: lem_ix
author_rank: Regular Contributor
timestamp: August 04, 2017, 12:40:19 pm
content: Extech and many other brands rebrand CEM meters so it's the same/similar meter. CEM have quality control issues but are okish meters if functioning. Continuity is annoyingly slow imo. Some had their range switch falling off. I have posted a internal picture of my peaktech 3360 somewhere on the forum which is the same meter. Still works fine no problems. If you're happy with your extech get it but I would personally get a brymen.

author: walcen
author_rank: Contributor
timestamp: August 04, 2017, 03:50:14 pm
content: Thanks guys, I appreciate the advice. I'll give the Brymen serious consideration.
Clamp on (Hall Effect) Ammeter - Page 1
Forum section: electronics / testgear

author: W8LV
author_rank: Regular Contributor
timestamp: August 09, 2017, 07:08:11 pm
content: Does anyone know of a cheap clamp ammeter that will read small amperages for simple bench work and experimentation for the five volts/microamps to a couple of amps crowd? I don't need a big HVAC Lineman's Job that's NIST Traceable and will miss the small stuff anyway...Yes, I have a Fluke V... But Harbour Freight/Princess Auto has its advantages.I've been working on a type of MHD pump for years, for medical applications.Alas... I'm a bit underfunded.Which I'm sure I wouldn't be if I was working on designing more efficient Plutonium Triggers. Such is Reality.;-)73 and All the Best!DE W8LV BillSent from my SM-N920V using Tapatalk

author: Hydron
author_rank: Super Contributor
timestamp: August 09, 2017, 07:20:49 pm
content: I'd look at the UT210E, discussed here on the EEVBlog forums:https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/.It will do down to 1mA resolution, is cheap, small, and has both DC and AC current modes (hall sensor).However it's rather susceptible to external magnetic fields, including the earth's, and will need zero-ing and to not be touched afterwards to get a good reading down in the mA region.There isn't much else budget stuff out there other than the newer UT211B, which goes to 0.1mA resolution (AC only, 1mA for DC), but I haven't used that and am not sure if it would be worth the upgrade over the (cheaper) UT210E given the external field sensitivity issues.If you want to do micro-amp stuff then you'll probably need a shunt or a multi-turn coil to sense the current.

author: W8LV
author_rank: Regular Contributor
timestamp: August 09, 2017, 08:45:08 pm
content: Wow and Thanks for the advice! Thats the power of Tapatalk: An almost Real Time COMMUNITY.(Though I often get lost in the actual using of it, lost password, etc.As with Everything, The Devil is in the Details... You can imagine the difficulty level here with the type of magnetic pump I am dealing with here... Might anyone suggest a cheap source of Mu-Metal to work with? What to scrap from? Or a cheaper "good enough" material to work with along these (flux ! ;-)) lines?I know one thing: I'm pretty close here. And a lot of experimentation with the "M" field isn't where the answer is: I'm sure it's right in Lentz's Equations and the "E" field. And sure as Hell, I'm going to find it.IF I can wrap my head around it and with a little luck. For now, it's looking me right in the face, whilst sticking it's tongue out and waving hands in ears.73 and All the Best!DE W8LV BillSent from my SM-N920V using Tapatalk

author: thm_w
author_rank: Super Contributor
timestamp: August 09, 2017, 09:01:11 pm
content: https://www.eevblog.com/forum/testgear/clamps-meters-with-miliampere-(ma)-resolution/
To those who have hacked RIGOL options - Problems with RIGLOL - Page 1
Forum section: electronics / testgear

author: Doc Alex
author_rank: Newbie
timestamp: August 02, 2017, 05:33:15 pm
content: Hello,First of all let me thank for supplying the options unlocking site/software. I successfully unlocked may new oscilloscope (DS1054z) with this unlocking key generator. It is a great addon and a magnificant help working with the oscilloscope.Now I bought at ebay a used DSA 815 spectrum analyzer. Of course before I bought it I verified, if I could unlock this aswell. Firmware is: 1.07.Everything went fine until I reached the point where I need to enter the "-" sign in the code. It seems not to be possible to enter this. Without the "-" it does not work.Is it no longer possible to unlock the DSA 815?If so may I kindly ask the programmers to look on the code if it is possible to modify it to the new firmware?Would it help to downgrade the firmware, enter the codes and upgrade to the newest? If so is there an FTP site where I can download the FW?Does anybody know what happens if I update an unlocked device with new firmware?Thank you very much in advanceAlex

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: August 02, 2017, 07:38:01 pm
content: I think you can also unlock it with SCPI Commands. Maybe you should try it.

author: ebastler
author_rank: Super Contributor
timestamp: August 02, 2017, 07:50:46 pm
content: I cannot speak for the DSA 815. But for the DS1000Z scopes, it is required that you enter the option codewithoutthe dashes. See the instructions in the first post of this thread:https://www.eevblog.com/forum/testgear/ds1000z-serie-unlocking/Most likely this applies for the DSA 815 as well, and something else went wrong when you tried to enter the code without the '-' sign. Please have a look at the instructions, and also try these proven troubleshooting approaches: 1. try again, 2. try again with another browser, 3. try with the downloaded offline version of Riglol. Good luck!

author: Doc Alex
author_rank: Newbie
timestamp: August 03, 2017, 06:45:59 pm
content: Quote from: ebastler on August 02, 2017, 07:50:46 pmThank you for this hint. I tried it and it worked!So I can confirm that it is possible to unlock the device with firmware 00.01.07 and boot version 00.01.03 when I enter the code without the dashes.Greeting with a bright smileAlexander
Need help identifying older Wandel-Golterman CRT mainframe - Page 1
Forum section: electronics / testgear

author: duak
author_rank: Super Contributor
timestamp: July 25, 2017, 11:01:39 pm
content: Hello,Is anyone familiar with this older (70's) CRT mainframe? I don't have the plugins or bezels. I believe I found a mark on the power supply assembly that indicated it was Wandel-Golterman and the rack handles seem to confirm it. I once thought to use it for something needing a big, slow X-Y display but I'm also thinking of giving it away to someone who could use it.Thanks kindly,Duane

author: WastelandTek
author_rank: Frequent Contributor
timestamp: July 25, 2017, 11:07:17 pm
content: hmmmmm, this would have been before they gobbled up Wavetek I am guessingI have no info for you, but that is pretty interestingCan we get a well lit shot of the plugin backplanes?

author: duak
author_rank: Super Contributor
timestamp: August 02, 2017, 10:00:03 pm
content: Here are some hopefully clear pictures of the mainframe.I ran in to some more info and think it might be an SG-3 X-Y scope that could accomodate various plugins.Cheers,
Mous and Keyboard usage with CMU200 device - Page 1
Forum section: electronics / testgear

author: markus_jlrb
author_rank: Regular Contributor
timestamp: August 02, 2017, 08:32:54 am
content: Dear Forum,is there a possibility to control the CMU200 via an external keyboard anduse a mouse pointer for control the soft keys on the display.I was not able to do this on my cmu200 beside the interruption of the runningSW via Alt-F4 and controlling of the DOS cli.Are there special driver needed to control the display via mouse?Many thanks in advance for your help.Markus

author: markus_jlrb
author_rank: Regular Contributor
timestamp: August 02, 2017, 08:59:46 am
content: Dears,I had found this remark in the user man:"USB connector for externalkeyboard only (not for otherpointing or storage devices)"Seems that no pointing device could by used - right?But why R&S provide two usb connectors if someonecould use only one for a keyboard?Markus

author: ps
author_rank: Regular Contributor
timestamp: August 02, 2017, 11:18:26 am
content: Quote from: markus_jlrb on August 02, 2017, 08:59:46 amBecause the mainboard provides two USB ports. Or four on CRTU. You can connect anything that comes with a MS-DOS 6.22 driver. Volkov Commander will take advantage of a mouse, but the R&S tools do not support any mouse operation.

author: markus_jlrb
author_rank: Regular Contributor
timestamp: August 02, 2017, 11:45:02 am
content: Thanks for clarification.Is this a general driver issue as a driver for mouse always show a mouse cursorindependent if the underlaying programm/application when the os is willing to doa graphical output on the screen.If a application take care of the mouse events that is a other story.Markus

author: usagi
author_rank: Frequent Contributor
timestamp: August 02, 2017, 07:24:23 pm
content: Quote from: markus_jlrb on August 02, 2017, 11:45:02 amnot true, applications can disable the mouse cursor if it wants. this doesn't have anything to do with the driver.
Philips PM 2521 Bench Auto Multimeter - Page 1
Forum section: electronics / testgear

author: Specmaster
author_rank: Super Contributor
timestamp: July 26, 2017, 02:24:02 pm
content: I have one of these arriving any day now and I'm wondering if anyone has previous experience of these at all? I don't believe the LCD display is backlit at all as the review I read about it mentions that it needs quite a good light to read it clearly.Has anyone ever tried to add some form of lighting for the screen at all in the past and if so, how successful was it? Any tips and advice on this meter would be most welcome.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 27, 2017, 12:50:54 am
content: a teardown :It seems doable, there is a clear plastic holding the lcdmaybe putting some leds on the side may help ?? but i don't see any light diffuser ??

author: Specmaster
author_rank: Super Contributor
timestamp: July 27, 2017, 04:16:39 pm
content: This is not the same as mine but may be very similar inside. However mine arrived with some damage to the front panel so before I can get around to the LED's I need to locate a replacement panel hopefully someone has defunct meter that I get get cheaply as a donor meter and rob the panel from that one?I'll post on the forum and ask if anyone has one.

author: Specmaster
author_rank: Super Contributor
timestamp: July 31, 2017, 10:01:23 am
content: I did manage to strip out the display from the front panel and the end result is that I can see no way of lighting the display at all. One side is just to close to the side wall and the besides the display sits too far forward to locate LED's at the sides.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 31, 2017, 10:41:16 am
content: could you post photos of the lcd assemblymaybe we can give you tips ?? or try to help

author: Specmaster
author_rank: Super Contributor
timestamp: July 31, 2017, 06:25:49 pm
content: I could take some photos next time I work on it but I did try a LED against the side of the display while it was on the panel and it wasn't visible at all, admittedly there are some black plastic flanges on the sides that hold the screen in place but there are gaps in them and I located the LED pointing directly at a gap even touching it.On one side there is space to mount some LED's but on the other, unless there smaller ones on the market there is no space.

author: tooki
author_rank: Super Contributor
timestamp: August 01, 2017, 04:16:13 pm
content: Quote from: coromonadalix on July 27, 2017, 12:50:54 amWow, a motor driven internal range selector switch, controlled by MCU front panel control? That's wild!!
TPI-1001-B Signal Generator  - Any Opinions - Page 1
Forum section: electronics / testgear

author: K1JOS
author_rank: Regular Contributor
timestamp: August 01, 2017, 03:06:11 pm
content: THis seems to be a very versatile and inexpensive vector signal gen out to 4.4 GHz based on the .https://www.rf-consultant.com/tpi-1001-b-signal-generator/?st-t=adwords&vt-k=%2Bsignal%20%2Bgenerator&vt-mt=b&vt-ap=1o2&gclid=Cj0KEQjwzYDMBRC1-JHJ7pPU278BEiQAwCv6JhoOHU5U3pNE7MAteKwYLpsvJHiMPO6U89vT7zgdUMEaAn6h8P8HAQWhat do people think of the specs?Jerry

author: amspire
author_rank: Super Contributor
timestamp: August 01, 2017, 03:27:56 pm
content: It is another device based around the Analog Devices ADF4351 chip. There are many devices available from the simple boards like this:http://www.ebay.com.au/itm/35M-4-4GHz-RF-Signal-Source-Frequency-Synthesizer-ADF4351-Development-Board-NEW-/282521180658through to devices like the one you have found.First thing is to notice the really big specification that is not mentioned - harmonic purity. This chip is not a sinewave output so it does not compare to a proper RF signal generator. This can still be very useful particularly if a device under test can reject harmonics, but a sinewave would be much better.There are devices built around this chip for half or quarter of the TPI-1001-B and the bare board well under $30, so it comes down to what you actually need. There have been a few discussions of these devices in this forum. Doing searches for ADF4350 and ADF4351 will probably find most of these discussions.
Clamps for holding PCB DUT in fixture - Page 1
Forum section: electronics / testgear

author: hcglitte
author_rank: Regular Contributor
timestamp: August 01, 2017, 11:52:54 am
content: Hi,I am trying to find some "arms" like the one in the picture (blue and red) to hold down a PCB into the jig. The spring will make sure that enough pressure is applied, but it also allows for easy twist/turn in order to release the DUT PCB. Does anyone know of a source for these, and what they are called?HC

author: DTJ
author_rank: Super Contributor
timestamp: August 01, 2017, 01:05:51 pm
content: No idea on where to get those clips but when ever I've needed them I make them up from the strips from panelised PCBs.
Home Energy Meters - Neurio, Sense and others - Page 1
Forum section: electronics / testgear

author: peperoca
author_rank: Contributor
timestamp: August 01, 2017, 12:46:05 pm
content: Hi everyone, I hope I haven't missed this topic earlier, but honestly couldn't find one.I'm looking into these kind of energy meters to get the big picture of what is going on. I know the power and energy draw from some appliances but this would bring a different perspective.Have any of you, used such equipments?Here in Uruguay we have different low voltage supply topologies such as single phase 230 V 50 Hz, three phase 3 wire 230 Volts L-L and 400 V three phase 4 wire, but the Neurio which is price attractive (and function to identify the load is also very attractive) can't handle the 230 V delta supply. I have asked the manufacturer what would happen if the neutral was connected to a hot phase (like in many multimeters on delta supplies) but they said it will damage the unit.I would also use this to perform simple energy audits on other places so it must be able to handle every topology and have (ideally) a Wifi connection.Do you guys can recommend some other system (if available) on the the <350 USD range?Thanks for any response.
SC8108 Network Tester Coax adapter - Page 1
Forum section: electronics / testgear

author: Wilts01
author_rank: Newbie
timestamp: August 01, 2017, 12:20:21 pm
content: I have one of the SC8108 cheap network testers. It's basic but it quickly tells me what is wrong and where the fault lies in CAT5/6 cables.They are made under a few brands but one example is herehttps://www.amazon.co.uk/d/Networking-Devices/SODIAL-Network-LOOPBACK-far-end-recognizer/B00JQ1AY1OAccording to the manual, it can also measure the length of coax cables, if you have the correct adapter. However, I can find no details of what the correct adapter is supposed to be. I have tried making my one from a BNC plug and a network cable but cannot work out what the pinout is meant to be despite a lot of combinations.Does anyone happen to know what the pinout is?
DC clamp meter richmeters903/Aneng an8801/zotek vc903 - Page 1
Forum section: electronics / testgear

author: xxxjjjkkk
author_rank: Newbie
timestamp: August 01, 2017, 09:50:25 am
content: HiSorry for the new topic, but I cant find a better place for this.Has anyone heard about this multimeter?https://www.aliexpress.com/store/product/RICHMETERS-903-Digital-Clamp-Meter-Auto-ranging-multimeter-1200A-AC-DC-Voltage-Temperature/909123_32814864557.html?spm=2114.12010612.0.0.J9mCKsIt's only 25-35$ with this description:Specifications?1.Frequency?99.99Hz/999.9Hz/9.999KHz/99.99KHz/999.9KHz/9.999MHz2.Temperature?-20~1000?/ -4~1832?3.capacitance?9.999nF/99.99nF/999.9nF/9.999uF/99.99uF/999.9uF/9.999mF4.DC voltage:600mV/6V/60V/600V/1000V5.AC voltage: 600mV/6V/60V/600V/750V6.DC Ammeter:600uA/6000uA/60A/600A/1200A7.AC Ammeter:600uA/6000uA/60A/600A/1200A8.Resistance?600?/6K/60K/600K/6M/ 60M?9.Duty cycle:1% to 99%,±(0.1%+2);10.Measurement mode: Double-integral style A/D transform11.Over range indication: OL12.Working environment: 0~40?, relative humidity < 80%13.Supply power: 3V (1.5V AA batteries * 2 Pcs)14.Dimension: 240*90*45mm15.Weight: 325g;I read a lot of richmeters as the 101, and its a really good cheap multimeter.I think it's a new product, because i cant find any test or review of this.What do you think about this?
An old, very old oscilloscope - National VP-5530B 300 - Page 1
Forum section: electronics / testgear

author: quakef4
author_rank: Newbie
timestamp: July 30, 2017, 05:26:02 pm
content: Hello everyone!I attach some photos of the instrument (I think of 1981):I can not find information, it's as if it never existed.It works well, it only needs to set potentiometers for false contacts.Does anyone recognize it?Thanks!

author: Vtile
author_rank: Super Contributor
timestamp: July 30, 2017, 07:57:49 pm
content: National Panasonic "Space age electronics" PS. Or were the Space age electronics a brand it is own. Can't remember.

author: ebastler
author_rank: Super Contributor
timestamp: July 30, 2017, 08:10:18 pm
content: As a side note, the term "very old oscilloscope" is relative.http://www.antiqueradios.com/forums/viewtopic.php?t=138809(Not my scope, unfortunately.)

author: nctnico
author_rank: Super Contributor
timestamp: July 30, 2017, 08:34:57 pm
content: From the age where things where made in a way it will never look like old junk

author: sietseage@ziggo.nl
author_rank: Newbie
timestamp: July 31, 2017, 07:41:59 pm
content: 1992 I thinkVerstuurd vanaf mijn SM-N910F met Tapatalk

author: septer012
author_rank: Regular Contributor
timestamp: July 31, 2017, 11:49:19 pm
content: Quote from: Vtile on July 30, 2017, 07:57:49 pmYes Matsuahita is Panasonic.Sent from my SM-G920V using Tapatalk

author: WastelandTek
author_rank: Frequent Contributor
timestamp: July 31, 2017, 11:55:09 pm
content: Quote from: nctnico on July 30, 2017, 08:34:57 pmright? 100 years from now that thing will still scream "tech"sure looks like it is trying to compete with the Tektronix scopes of the era
PINTEK DP-65 question - Page 1
Forum section: electronics / testgear

author: taydin
author_rank: Frequent Contributor
timestamp: July 29, 2017, 08:29:39 pm
content: Hello folks, I am looking into getting a Pintek DP-65 differential probe to do some troubleshooting work on UPS'es. There is one thing about these probes that I wasn't able to find any information about, so I thought I'd ask hereThe unit has three ranges:x20, max 130Vx50, max 325Vx200, max 1300VWhat I'm not sure about is, if I have the unit at the x20 range and accidentally apply 800V to the input, will it potentially get damaged? or does it have a way of indicating "out of range" condition?And when in this "out of range" mode, what kind of voltage will it be applying to the scope? Is it going to be the same voltage as if I had applied 130V to the input? Or will it be much higher than this?

author: alm
author_rank: Super Contributor
timestamp: July 29, 2017, 09:38:20 pm
content: According tothese specifications, the maximum differential voltage is 1300 Vpeak(common mode voltage is 1300 Vpeak, CAT II/III 450 Vrms). Based on that, the probe should survive a differential mode voltage of 800 V without damage, and the output voltage should stay between +/- 7 V. Obviously the waveform will be clipped. Overload recovery will be poor, so do not expect the signal to be correct the millisecond it gets within scale.

author: taydin
author_rank: Frequent Contributor
timestamp: July 30, 2017, 12:16:21 pm
content: Thanks for the response. I had missed the line that says maximum output voltage, so this makes sense now. I will be testing this once the unit arrives and post an update here.
Another MSH5200A signal generator mod - Page 1
Forum section: electronics / testgear

author: jeff_pimenta
author_rank: Newbie
timestamp: June 20, 2017, 01:22:31 pm
content: Hi everyone,Iam working in a project that needs a special signal for analysis: a 1% pilot signal for THD reference. I bought a cheap MHS5200A signal generator and made a few mods onthis project.https://github.com/wd5gnr/mhs5200aWith a few modifications iam able to put waves on my equipament, here's my fork:https://github.com/jeffersonpimenta/new-mhs5200a-12-bitsAnd here's my pilot signal:Pilot signal FFT:Until now i have all work flawless, but if i made modifications on my pilot signal i got harmonics in my wave. In a pure sine these harmonics aren't present. I think its something about sample rate, aliasing and sampling, but i need help.I algo got issues with maximum points, sometimes i got spikes in my waves:Thanks in advance!

author: boggis the cat
author_rank: Regular Contributor
timestamp: July 30, 2017, 02:35:07 am
content: Quote from: jeff_pimenta on June 20, 2017, 01:22:31 pmThis looks like an interesting project.Could these artefacts be due to the data you are uploading, or is the sig gen the source of the problems?You could plot the data that is to be uploaded in Excel (or similar), and visually check for artefacts, and / or use other checks within the sheet. Maths errors in the spreadsheet could be a source.
Anristu MG3670B Digital Modulation Sig Gen for more than intended - Page 1
Forum section: electronics / testgear

author: wattw
author_rank: Newbie
timestamp: July 30, 2017, 03:56:39 am
content: I guess this a through-back to Red Rider in 2014.I too bought an Anritsu MG3670B for less than a song. This box creates cell phone test message protocols. I got it because I thought I could use its very pure CW generator capabilities, RF freq. range and level attenuation to teach myself about quadrature modulation/demodulation. If I have it right, I believe that I can use the I&Q input and outputs jacks to create digitally modulated RF signals - limited to one of the nine pre-established baseband frequencies (controlled by the installed system modules).Can anybody confirm or add to my assumptions and/or point me to a service manual (with schematic) for my Anritsu MG3670B?This boat anchor is just way to cool to not be highly useful for something...Thanks for anything you've got for me,Bill, aka) wattw

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: July 30, 2017, 04:43:53 pm
content: Quote from: wattw on July 30, 2017, 03:56:39 amCW on these old Anritsu generators isn't very pure, it's RF performance is roughly the same as the old HP/Agilent ESG Series which is OK for some tasks but hardly outstanding.Quote
Who wants to watch someone teardown a DMM fuse? YT channel Voltlog. - Page 1
Forum section: electronics / testgear

author: wilfred
author_rank: Super Contributor
timestamp: August 02, 2017, 12:54:32 am
content: Yeah, well I just did. YT channel Voltlog who may be a forum member here just made a video I found interesting. He bought some fuses on Ebay from China branded "Bussman" and examined them to try to see if they were fake or not.I like his videos because they are quite well made in their own modest way. He doesn't big-note himself and he takes the viewer along with him very smoothly as he speaks his thoughts.There is at various times discussions here where someone wonders about making YT videos themselves to share their hobby electronics interest. Well Voltlog is a good example to look at for inspiration.Anyone want to persuade Dave to do a similar video on his known genuine DMM fuses? I just bought some but I don't feel wealthy enough to go blowing HRC fuses even at Dave's modest prices.

author: Electro Detective
author_rank: Super Contributor
timestamp: August 02, 2017, 01:22:08 am
content: Good score, thanks for posting and to the YoutuberMy fuse supplies are based on buying a 10 pack, be they cheap, suspect/fake or the real deal,picking one or two at random,then testing them to their claimedOBLIVIONVA/time/hold specs, and keep notes in the pack.i.e. this way I know the other 8 fuses will perform and be on the money whenever required,especially as replacements in expensive equipment

author: kalel
author_rank: Frequent Contributor
timestamp: August 02, 2017, 01:32:30 am
content: Interesting thing to investigate and a good video. It would be nice to see them compared with the "real deal".Just curious, how often do those break in equipment that uses them? E.g. multimeters and other bench stuff.They might be costly, but do you replace them often of not is the question.

author: alm
author_rank: Super Contributor
timestamp: August 02, 2017, 01:43:07 am
content: Depends on how careful the user is (and if their meter beeps at them when switching to voltage with the leads in the current jacks). I do not think I have ever accidentally blown a DMM fuse. I have used a multimeter (with cheap glass fuses) as makeshift fuse-holder at one point: I wanted to prevent the PCB fuse in my DUT from blowing, so put a fast lower value fuse in series, and the DMM has convenient banana jacks.
Gould Datasys 944A storage oscilloscope - Page 1
Forum section: electronics / testgear

author: wilwin
author_rank: Newbie
timestamp: July 29, 2017, 10:08:02 pm
content: Hello,I have a Gould Datasys 944A storage oscilloscope with a serious batteryproblem. All these scopes use a 3.6V Ni-MH battery on the cpu pcb board.The battery leaks after a long time and the acid destroys the copper onthe pcb. I had stored this scope, which was working well, for 7 months.I needed itthe last week and it was not working anymore. The battery had done hiswork..I removed the battery and cleaned the pcb. Several printline weredamaged.I tried to solve it but it was nearly impossible to follow theconnections without removing several chips. I tried to find a servicemanual on the net but didnt find it. Even a service manual from the 800series is ok because it uses the same cpu pcb. I searched again on thenet and found a link in the States, who had sold Gould there, but hecouldnt help me.An old collegue had a Gould Datasys 840 which he does not use anymore.I got the scope and the operating manual, but no luck..The same problemwith the battery and the cpu pcb even worse : the memory chips fell offthe board when you touch them.So if anyone has a service manual for the 800 or 900 series please letme know. I will pay for it!The only thing i could do now is desoldering some IC from the 800 boardto follow the broken lines on the 900 board.If you have a working Gould scope move your battery from the CPU pcb tosomewher else...
Tek TDS3014 upgrade? - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: July 28, 2017, 06:28:38 pm
content: Can't a TDS3014 be upgraded to a 3054 thru software? I seem to remember something about it. I know you can upgrade/activate the measurement features - I did that with my 3054, but I thought the 3014 was limited in the software to 100Mhz but could be hacked up to 500Mhz.The reason I ask is I found a 3014 for sale for $400, which is low for that scope as it is, but for $400 if it was hacked to a 3054, then that is a hell of a deal. I have a 3054B and love it.Jerry

author: alm
author_rank: Super Contributor
timestamp: July 28, 2017, 06:57:31 pm
content: Was easy to find usingsite:eevblog.com tds3000 upgrade:https://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/

author: cncjerry
author_rank: Unknown
timestamp: July 28, 2017, 07:13:33 pm
content: I went looking for that post as I was on it and couldn't find it for some reason. thanks.Anyway, that's a pretty decent deal then, a 500Mhz, 4 channel 3054b equivalent for $400?

author: alm
author_rank: Super Contributor
timestamp: July 28, 2017, 07:27:02 pm
content: In my opinion yes. Assuming the 10 kS record length is sufficient. Short by modern standards, but better than the 2.5 kS that was common in many other early Tek DSOs. Keep in mind that you will need suitable probes to use that 500 MHz bandwidth, unless you only plan to use it with 50 Ohm sources with a direct coax connection.Could be passive high-impedance (e.g. P6139), passive low-impedance (e.g. P6158) or active (e.g. P6243). The input capacitance is lower than many lower bandwidth scopes, so not all probes may compensate correctly.

author: Hydron
author_rank: Super Contributor
timestamp: July 28, 2017, 08:33:48 pm
content: I can confirm that 3014B unlocks to 3054B (unsure about upgrading to 3064B, didn't try that one as it's not clear if it's running the same hardware)Bear in mind that the 3000 series needs a communication module to enter the commands (3000B series can do it via ethernet & the built in web page, no PC software required)If you do the hack and have the appropriate gear, would you mind checking if it needs a factory cal afterwards for correct performance? I unfortunately don't have the required leveled sine wave generator or 2.2V pulse generator.

author: cncjerry
author_rank: Unknown
timestamp: July 29, 2017, 03:50:16 pm
content: I unlocked all the extra features on my TDS3054B using the small insert - they all worked great.I was thinking about purchasing this 3014, it's a heck of a deal at that price but I have too many scopes as it is.It is listed in the SF craigslist if anyone is interested.btw: I never found the 10k record length to be an issue. I actually like the 500 point fast recording option at times.
HP 5326A Timer-Counter - Page 1
Forum section: electronics / testgear

author: mdszy
author_rank: Unknown
timestamp: July 30, 2017, 12:29:22 am
content: Hey all! Long time no post. I just got something I'm super excited about, an old HP 5326A Timer/Counter! I got it on ebay for 75USD shipped under the condition "for parts or not working"... but that was just because the seller had no way to test it. I knew I had to have it, since it's almost worth the 75USD just for the nixie tubes inside, and even if it was busted, I would've loved to try to fix it. Lo-and-behold, though, it works perfectly well! There's nothing wrong with it at all from what I can tell, and it even seems pretty dead-on to me.However, I don't have any calibration equipment or anything accurate enough to compare it to, or any frequency standards or anything, so I'm not entirely sure as to its accuracy... but it's good enough for my purposes until I amass enough equipment/standards to be able to really test/calibrate it!The attached photo is showing the output when I feed it a 1.234KHz signal from a random AD9833 DDS development board I have lying around... the only frequency generator I have!
Rigol DS1140Z Plus and rigup for Windows - Page 1
Forum section: electronics / testgear

author: Oldguy
author_rank: Newbie
timestamp: July 28, 2017, 05:10:43 am
content: I have missed something and it's probably staring me in the face, but I haven’t found it.Is there a way to use rigup from a windows platform for the 1104z?I have run “rigup-0.4.2-x86_64-win” and it turned out to be for the 2000 series scopes. I am looking for a rigup for Windows, for the 1104z Plus. I do not have a Linux/FreeBSD... and I really don't want to go down that path. I have the .bin file from the JTAG port (Note the JTAG header was not populated)Any help would be appreciated. Thanks

author: Edinson
author_rank: Contributor
timestamp: July 28, 2017, 05:30:26 pm
content: I used this versionhttp://i-hobby.org/blog/Electronics/60.htmlI found it in reply #4091:https://www.eevblog.com/forum/testgear/sniffing-the-rigol's-internal-i2c-bus/4075/For me it worked without problems.

author: Oldguy
author_rank: Newbie
timestamp: July 29, 2017, 07:16:11 am
content: Thank you, SUCCESS!The first link (http://i-hobby.org/blog/Electronics/60.html) is for the correct download of the rigup.zip (for windows).I would not have been successful without those that came before me.So a big thank you.
Searching for the Unaohm EP 2500 CD-ROM with software and drivers - Page 1
Forum section: electronics / testgear

author: Bicurico
author_rank: Super Contributor
timestamp: July 28, 2017, 10:03:19 pm
content: Hello,Does anyone own the following CD-ROM:"EP 2500 - EP 2300"USB DriverRemote Control SoftwareManualCatalogueI purchased a second hand Unaohm EP 2500, but the included CD cover was missing the actual CD-ROM...Thanks,Vitor
Fluke 45 calibration help - Page 1
Forum section: electronics / testgear

author: Dirac
author_rank: Newbie
timestamp: January 03, 2017, 04:29:52 pm
content: Hello good day. I bought a Fluke 45 Multimeter, when I performed the ohm test, put the tips together and the ohm 2.76 ohm was off, then download the service manual to calibrate and perform the calibration and continue the same at 2.76 ohm. Please if someone can help me with the zero ohm setting. I leave the images there.imagen 2.76 ohmimagen de la calibracion 290ohmI would appreciate.

author: oois1
author_rank: Newbie
timestamp: July 28, 2017, 03:44:43 am
content: I got the same problem too.
Hameg HM605 - Page 1
Forum section: electronics / testgear

author: Gyokuro
author_rank: Newbie
timestamp: July 27, 2017, 07:03:05 pm
content: HelloI am new here and need an advice.I want a good analog oscilloscope and therefore I am looking for a Hameg HM605.I found one in the internet for 180 €. Do you think this is a good price? Should I buy it?Thank you for your replies.

author: WaveyDipole
author_rank: Frequent Contributor
timestamp: July 27, 2017, 09:33:54 pm
content: Well that translates to about 160GBP. The general rule with vintage analogue oscilloscopes is said to be 1GBP per MHz of bandwidth and since this is a 60MHz, one might be expected to pay around 60GBP for a working scope with that bandwidth. However Hamegs often seem to go for considerably more than the market average and I have seen one of these go for more than 100GBP on eBay. The 604/605 does not come up very often which may be a factor, although 180€ does seem rather high. Then again, perhaps the market in Europe is a little different to the UK.