hybridfree/eevblog-posts huggingface dataset:
Signal Generator and Logic Analyzer module for SainSmart DDS140 USB Oscilloscope - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: May 14, 2016, 12:47:48 am
content: I have seen a review on this forum about the SainSmart DDS140 USB Oscilloscope.But what about the optional Signal Generator and Logic Analyzer module that can be added throughthe external feature connector?Signal Generator module==================http://www.sainsmart.com/sainsmart-signal-generator-for-sainsmart-dds-140.htmlAre there any reviews available about the optional Signal Generator module?If not, who owns such a Signal Generator module and can make a review?I am interested in a review of the hardware and the software.If the software is not that good, it could probably be improved later on.But what about the hardware itself? Is that any good?Logic Analyzer module================http://www.sainsmart.com/sainsmart-logic-analyzer-for-sainsmart-dds-140.htmlAre there any reviews available about the optional Logic Analyzer module?If not, who owns such a Logic Analyzer module and can make a review?I am interested in a review of the hardware and the software.If the software is not that good, it could probably be improved later on.But what about the hardware itself? Is that any good?Combination of Signal Generator and Logic Analyzer module==========================================Is it possible to mount BOTH the Signal Generator module and the Logic Analyzer module at the same time?This seems not to be possible, as there is no passthrough feature connector on the module itself.Combination of 2 Signal Generator modules===============================Is it possible to mount two Signal Generator modules at the same time?This seems not to be possible, as there is no passthrough feature connector on the module itself.Is it really only possible to have only one signal generator output in total?SainSmart DDS140 USB Oscilloscope itself==============================http://www.sainsmart.com/sainsmart-dds-140-40m-200m-s-virtual-oscilloscope-black.htmlIs the software really that bad?If the software is not that good, it could probably be improved later on.But what about the hardware itself? Is that any good?Using 2 SainSmart DDS140 USB Oscilloscopes on one and the same computer=======================================================Is it possible to use two of these USB scopes on the same computer, and link them together in the software, to have a 4 channel USB Oscilloscope?Are the 4 input channels synchronized with each other? Did anyone try this scenario?Some USB scopes offer this feature (e.g. SmartScope from Lab-Nation).

author: pascal_sweden
author_rank: Super Contributor
timestamp: July 15, 2016, 09:08:26 am
content: Nobody that has bought any of these optional modules?
New Rigol DS1000B Series! --- my mistake!  - Page 1
Forum section: electronics / testgear

author: Sparky
author_rank: Frequent Contributor
timestamp: October 24, 2012, 06:13:21 am
content: I've frequented the Rigol NA website a few times in the last week and just today I noticed they seem to have expanded the lower end DS1000 series scopes with a new "DS1000B" line. I didn't see it posted or mentioned here, so I thought I'd put it out there! Anyone heard of these models before? I'm guessing they are new, but I could have missed them previously. All models in the DS1000B line have 4 channels, and up to 200MHz bandwidth! Memory storage nothing to write home about...Check 'em out here:http://www.rigolna.com/products/digital-oscilloscopes/ds1000b/So, lots more choices for those of us looking at purchasing a scope!What do people think about this range? Seems to really fill in the low-end for those needing 4 analog channels, not needing memory/waveform storage/decoding options/...Edit: Sorry folks...seems I'm a bit behind with knowing what Rigol had out!

author: Herman
author_rank: Contributor
timestamp: October 25, 2012, 02:02:32 am
content: DS1000B has introduced a long time

author: Sparky
author_rank: Frequent Contributor
timestamp: October 25, 2012, 03:23:12 am
content: Yes, lack of any excitement here is definitely consistent with that! Seems I completely missed this series of 4Ch scopes on my first look at Rigol.Sorry for the false alarm!

author: borjam
author_rank: Unknown
timestamp: July 12, 2016, 09:45:31 pm
content: For the record, I've just checked Rigol's firmware website and there's a new firmware version for the 1000B series, released today.Release number: DS1000B Firmware_00.04.01.02.00

author: ebastler
author_rank: Super Contributor
timestamp: July 13, 2016, 07:49:50 am
content: That is a pleasant surprise, I'd say! Honestly, I would not have expected Rigol to still spend R&D time supporting a scope model that must be >5 years old.Makes me hopeful that we will eventually see further firmware updates for the DS1000Z series ;-)
Tektronix 2201 - 70­­€ good price? - Page 1
Forum section: electronics / testgear

author: acinho
author_rank: Newbie
timestamp: July 12, 2016, 02:40:24 pm
content: Is 70€ a good price for Tektronix 2201?Thanks!

author: Fungus
author_rank: Super Contributor
timestamp: July 12, 2016, 02:55:31 pm
content: Does it work? Is it in good condition? Does it have probes/accessories/manuals? Do all the controls work?Does it do what you need? Is 20MHz bandwidth enough? (unlikely)$70 is a high price foranythingif it doesn't do the job.

author: David Hess
author_rank: Super Contributor
timestamp: July 12, 2016, 09:29:41 pm
content: If availability of similar instruments is limited in Slovenia, then I would say it is a reasonable price (70€ is about $78 US) assuming it works and is in good shape. Can you inspect it before buying or will it be shipped to you? The 20 MHz bandwidth will be limiting for many applications.Artek Manuals has the service manual available:http://artekmanuals.com/manuals/tektronix-manuals/

author: acinho
author_rank: Newbie
timestamp: July 12, 2016, 10:05:18 pm
content: Prices here are ridiculous.It'll be shipped from abroad but pictures do show a square signal. Probes are included and it's calibrated.20MHz will be enough for my project.

author: David Hess
author_rank: Super Contributor
timestamp: July 13, 2016, 04:13:15 am
content: Quote from: acinho on July 12, 2016, 10:05:18 pmThat is what I thought; I know from reports that availability of used test equipment or at least old Tektronix oscilloscopes is much poorer outside of the US. If you have something shipped in, then you risk shipping damage if the seller does not pack it correctly.We do not see much about the 2201 or even the 2225 series which it is part of over on TekScopes@yahoogroups.com but I do not know of any common problems with them; their design is a major refinement of the older and faster 2235 series and easy to repair and maintain. The 20 MHz 2201 and 2205 lack the x10 vertical magnification for 500uV/div sensitivity which make the faster 50 MHz 2210, 2211, and 2225 unique in their class but if that is not a requirement then so what? 20 MHz and 5mV/div is completely suitable for most applications.Since the service and operating manual is available inexpensively, that is not an objection either.Update: you can find the manuals for the 2205 which is the same oscilloscope without the storage functionality here:http://w140.com/tekwiki/wiki/2205
HP 34401A vs Fluke 8808A - Page 1
Forum section: electronics / testgear

author: jacksradio
author_rank: Contributor
timestamp: July 10, 2016, 11:50:46 pm
content: Hoping to gather some information on the above two meters. I am looking to purchase one or the other and thought I would ask if there is any real differences besides one being 6 1/2 digits and the other 5 1/2 digits. Iam notlooking to measure down to the nano volt level, just want a reliable and accurate meter that is easy to repair if need be for mainly hobby and personal repair work. Please share any thoughts or real world experiences.ThanksJack

author: uncle_bob
author_rank: Unknown
timestamp: July 11, 2016, 12:01:46 am
content: HiIf your main need is to measure nanovolts ... neither one is the right thing for the job. There are other meters that are focused on that sort of thing.Bob

author: HighVoltage
author_rank: Super Contributor
timestamp: July 11, 2016, 10:39:37 am
content: I have no experience with the 8808A but plenty of experience with the 34401AYou can get the 34401A for reasonable low cost on ebay and it is repairable if it should break.The best thing about this meter is its reliability.And usually they never break.I have many of them in use in the lab and on a production line and I am extremely satisfied with them.

author: uncle_bob
author_rank: Unknown
timestamp: July 11, 2016, 12:06:56 pm
content: HiTo the extent that either meter has a weak point, it's the display. The 34401A *will* get pretty dim if run for years and years. We have a lot of examples of that running around the plant. There isn't as big a population of 8808's so I don't have a statistically valid sample in that case. I would simply bet that the same display technology has the same issues. Earlier Fluke meters did ...Bob

author: TiN
author_rank: Super Contributor
timestamp: July 11, 2016, 01:44:10 pm
content: I'd go for 34401A + software control. Front panel operation is clunky.

author: jacksradio
author_rank: Contributor
timestamp: July 13, 2016, 12:02:21 am
content: no one has anything to say about a Fluke 8808A???

author: uncle_bob
author_rank: Unknown
timestamp: July 13, 2016, 12:06:53 am
content: Quote from: jacksradio on July 13, 2016, 12:02:21 amHiThe 34401 has been a go to item for about two decades now. Pretty much every shop on the planet has at least one if not a few dozen of them. The 8808 never made it into the same league popularity wise. That's not to say it is a bad meter. The volume and age of the 34401 make them a staple on the used market at pretty good prices. That makes them tough to compete with.If you are going for a brand new meter, HP has several newer DVM's at pretty much the same price ...Bob
spare Tektronix TDS5104B - Page 1
Forum section: electronics / testgear

author: colonviejo
author_rank: Newbie
timestamp: July 10, 2016, 07:57:42 pm
content: I need the spare input channel of a Digital Phosphor Oscilloscope Tektronix TDS5104B regards, Hetor

author: GreyWoolfe
author_rank: Unknown
timestamp: July 11, 2016, 01:16:30 am
content: If you are looking for this, you may want to repost in the buy, sell, wanted section. More people may see it.

author: tautech
author_rank: Super Contributor
timestamp: July 11, 2016, 09:05:26 am
content: Try Sphere in Canada, they specialize in Ten parts, you'll find them no problem with Google.
Rigol DP831/DP831A Calibration Script, using DM3086 - Page 1
Forum section: electronics / testgear

author: 2N3055
author_rank: Super Contributor
timestamp: July 10, 2016, 11:59:49 am
content: Rigol DP831/DP831A Calibration Script, using DM3086 Calibration ScriptThis script allows calibration of a DP831/DP831A using DM3086 by python-ivi. The calibration script was based heavily on a previous script by[ Stupid Beard on the EEVBlog forums ],which in turn was based on a [bson on the EEVBlog forums](https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg650855/#msg650855),which in turn was based on a [MATLAB script by LaurentR](https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg587350/#msg587350).The SCPI calibration information came from (https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg556101/#msg556101) and (https://www.eevblog.com/forum/testgear/rigol-dp832-firmware-updates-and-bug-list/msg558318/#msg558318).Made all the changes to the calibration tables that are different from DP832..## Requirements* [python-ivi](https://github.com/python-ivi/python-ivi)* [python-vxi11] (https://github.com/python-ivi/python-vxi11) for TCP/IP support* [numpy-1.11.1] (used prebuilt windows 64bit version)* A Rigol DP831/DP831A Power Supply* A RIGOL DM3086 6.5 Digit MultimeterTested using Python 3.5.2 on WIN 7/64bit and has not been tested on other platforms.Used windows only sound lib.. (now a proper ping machine)On other platforms should be changed to some other method of creating sound....## Using itSee the comments at the top of calibrate.py and change the settings as appropriate, then run the script.I recommend doing Manual Cal/ Calibrate ADC Board before calibration cycle on that channel .. It made for more accurate cal for me.Also I recommend doing calibration one channel at a time.. Less confusing that way..Make sure to pay attention when calibrating CH3... When measuring voltage values are negative and sent as calibration info as negative..But DP831/DP831A expects current calibration values to be positive for all channels, even on negative CH3 ...... so make sure to reverse measurement leads only for CH3 CURRENT measurementsLike so:CH1 Voltage RED--RED / BLACK--BLACKCH1 Current RED--RED / BLACK--BLACKCH2 Voltage RED--RED / BLACK--BLACKCH2 Current RED--RED / BLACK--BLACKCH3 Voltage RED--RED / BLACK--BLACKCH3 Current RED--BLACK / BLACK--REDOf course, that could have been done in a script..., but was too lazy...just reverse the leads...## Quick note on current rangesRigol DM3068 has 10A current input.. No manual entry needed.. Too lazy to take it out from the code...Ran it few times (more like dozens.. I guess I have an extremely well calibrated instrument now)and seems fine... No guaranties though.. use it at your own risk...Anybody needs a help with it, let me know, I'll help if I can..Cheers,Sinisa
Need firmware upgrade help? - Page 1
Forum section: electronics / testgear

author: tony3d
author_rank: Frequent Contributor
timestamp: July 10, 2016, 01:31:03 am
content: Hi all, just downloaded the firmware upgrade for my Owon SDS7102 scope. Now what? Never upgraded a scope before. I have the Rar file. How do I perform the upgrade?

author: GEuser
author_rank: Frequent Contributor
timestamp: July 10, 2016, 02:34:22 am
content: Read the help file instructions on the net , or plug in it in and fire up the software i think ?

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2016, 02:41:55 am
content: Quote from: tony3d on July 10, 2016, 01:31:03 amYou'll have to unpack the .rar. It will likely contain a few files within including the update itself and also instructions.Something like Winrar will do the job.

author: tony3d
author_rank: Frequent Contributor
timestamp: July 10, 2016, 03:17:14 am
content: Quote from: tautech on July 10, 2016, 02:41:55 amOk, I'm on a Mac, but I am running Windows 10 natively on an external drive. Should work right?

author: tautech
author_rank: Super Contributor
timestamp: July 10, 2016, 03:45:25 am
content: Quote from: tony3d on July 10, 2016, 03:17:14 amYou'll just have to check you get a Win 10 compatible version. Win 10 may be able to do it with a default program, I'm not sure.Just double click the .rar and follow the Windows prompts

author: ralphrmartin
author_rank: Frequent Contributor
timestamp: July 10, 2016, 05:22:27 pm
content: Look for a Mac program called Keka. It will unpack the rar file. You should then end up with the appropriate parts which you can use in a virtual pc of some kind (Parallels, VirtualBox, etc) on your mac.

author: Kilrah
author_rank: Unknown
timestamp: July 10, 2016, 05:36:27 pm
content: On Windows you can use 7-zip to unpack the .rar file.
Mastech MS8260E tear down - Page 1
Forum section: electronics / testgear

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 06:13:30 pm
content: I needed a cheap LCR to measure my flyback transformers inductance , i searched high and low through pages after pages of eBay , Amazon and all there other online markets... I found a lot of Chinese cheapies from HTC , metroQ etc .... but nothing substantial with some credibility...then I came across mastech which had some credibility, many people have reviewed their products some saying it is utter garbage and some saying it good , so I thought why not give it a try ... so I went ahead and got mastech MS8260E ....it is a manual ranging multimeter with LCR functions built in...Here are some pictures

author: aniket
author_rank: Contributor
timestamp: July 20, 2016, 06:20:57 pm
content: It just has some PTC protection in the input nothing else .....Sent from my Lenovo A7010a48 using Tapatalk
Need help to identify some old equipments - Page 1
Forum section: electronics / testgear

author: Walter
author_rank: Newbie
timestamp: July 07, 2016, 08:01:39 pm
content: HiI'm trying to identify a set of old electronics panels. I've being able to identify the most of them, but there are still several that I definitively can't find.So I kindly ask you if you can help me to identify any equipment in the attached pictures. Any indication would be welcome.Thank you!Regards

author: uncle_bob
author_rank: Unknown
timestamp: July 07, 2016, 09:24:59 pm
content: HiAt least from the pictures, there are no manufacturer ID's on any of them. Is that really the case? If so, it'll take a view that shows the markings on the switches and buttons to guess what they were custom built to do.Bob

author: Walter
author_rank: Newbie
timestamp: July 08, 2016, 08:13:16 am
content: Unfortunately these are the only pictures I have. They were used as movie props that I try to reconstruct for an exhibition.

author: uncle_bob
author_rank: Unknown
timestamp: July 08, 2016, 01:15:09 pm
content: Quote from: Walter on July 08, 2016, 08:13:16 amHiA lot of the prop guys bought gear by the truck load. The combination had real test gear in it and custom boxes made for very specific things. They really didn't care what it was. If it lit up and looked shiny ... that was fine. Some of the stuff lived a long life floating between various movies.Bob

author: Tomorokoshi
author_rank: Super Contributor
timestamp: July 08, 2016, 05:06:41 pm
content: "Sans-titre-1.jpg" looks like a custom panel, not a standard part. The control switches are typical of those used in control panel builds.

author: Walter
author_rank: Newbie
timestamp: July 09, 2016, 09:38:32 am
content: Quote from: Tomorokoshi on July 08, 2016, 05:06:41 pmYeah, I'm forced to be agreed with that. But what about the others?05970019.jpg : Could it be anything but power supplies ? I found only two manufacters that have meters that look like these ones:EG&GandSpectral DynamicsPICT3943.jpg : No idea what kind of equipment it could be? A calculator? A dispatcher or communications device?Power-controller.jpg : I think these 3 equipments are the same manufacturer. However for first one (it's written somthing like "UUTpower controller"), I think the grid with leds have been added in order to "lit up and look shiny" as uncle_bob saybriefcase.jpg : That's a pity, the model name is almost readable!dc-converter.jpg : We know it's a DC-DC converter, it shouldn't be so hard to identify?

author: uncle_bob
author_rank: Unknown
timestamp: July 09, 2016, 12:57:02 pm
content: Quote from: Walter on July 09, 2016, 09:38:32 amHiOutfits like EG&G did a *lot* of custom stuff. One off designs of racks full of gear .... very common. Once the end task was done, the equipment was scrapped out. Often the scrap out process took place quite close to Southern California (and thus into movies). Finding a spec for that sort of stuff .... not going to happen.Bob
Wavetek 2405 Signal Generator - Page 1
Forum section: electronics / testgear

author: WireEd
author_rank: Newbie
timestamp: June 14, 2016, 05:05:41 pm
content: Hi all, newb here...I have searched high and low on this site as well as on the web for info on this Wavetek 2405 and it is pretty scarce. Seems the company that bought the company that bought Wavetek has nothing on their site for legacy stuff. I scored this from a friend for a reasonable price and it works great. I am looking for the owners manual and/or service manual to have for reference and calibration. Or maybe a teardown!!Does anyone know of a link?I did find the manual for the 2407 and the controls are identical.Does anyone know the differences?Thoughts?? Thanks in advance!!

author: tautech
author_rank: Super Contributor
timestamp: June 15, 2016, 09:42:06 am
content: Welcome to the forum.If the front panel UI is the same it's very likely they are from the same series, the model #'s indicate they are and therefore the only differencecouldbe frequency capabilities. Maybe some internal differences too.Quick Google search resulting in these links suggest the 2405, 2407 and 2410 might be very similar:http://www.ebay.com/itm/WAVETEK-2405-2410A-Instruction-Manual-Ops-Service-/370173640589http://www.schematicsunlimited.com/w/wavetek/wavetek-2407-signal-generator-operations-manualLinks to further manual repositories are in this sticky thread in the forum Repair board:https://www.eevblog.com/forum/repair/repair-documents-and-links-sticky-me-please-mods/Some have manufacturers folders that should be carefully checked for a specific model as Google does not always find them.Come back to us with any links you find for others to benefit from and if no luck: shout again.

author: WireEd
author_rank: Newbie
timestamp: July 08, 2016, 04:56:22 pm
content: Sorry for the late response Tautech. Thank you kindly for the links, and thanks for the welcome!! I am really looking forward to creating some magic smoke!! ;-)
SIGLENT SDG1025 control from MATLAB - Page 1
Forum section: electronics / testgear

author: singtralala
author_rank: Newbie
timestamp: July 08, 2016, 12:13:55 pm
content: Greetings,I´ve been looking for a way to control the output of a signal generator using the serial port to communicate with the SDG1025. However, the manual does not provide any information on how this could be achieved. I need to be able to repeatedly and reliably start and stop the pulse generated by the SDG with very precise timing, since we are using the pulse to synchronize other hardware during an experiment, so pressing the output button by hand is a no-go.I will be thankful for all guidance.

author: tautech
author_rank: Super Contributor
timestamp: July 08, 2016, 04:18:24 pm
content: Welcome to the forum.P56 of the manual describes the use of a gated external trigger with the EXTTrig rear BNC.http://siglentamerica.com/download/UM/SDG1000_UserManual_UM02010-E08A.pdfN-Cycle/GatedN-Cycle has specific number of waveform cycles, and every burst is activatedby a trigger event. Gated burst use external source to control burst as whento be activated.But it goes on to mention:CyclesSet the number of waveform cycle in an N-Cycle (1 to 50,000 or Infinite).If you choose Infinite, then a continuous waveform will be generated whichwill not stop until a trigger event happens.Can you use this functionality instead?Will it be simpler for you than Matlab?Additional drivers are here:http://www.siglentamerica.com/gjjrj.aspx?id=204There's also the Sync output described on P69 for more functionality that might be useful.
Five volts on DMM diode checks, is it an issue for concern? - Page 1
Forum section: electronics / testgear

author: pherdie
author_rank: Contributor
timestamp: July 07, 2016, 08:10:47 pm
content: Deciding whether to purchase a Keysight 34461A or a Fluke 8845. Both employ five volt sourcing on diode checks.There has been some concerns expressed about the use of five volts and potential damage to certain components, yet, at least two major high end manufacturers have moved to the higher five volt parameter.Something I should consider in my purchase?

author: D3f1ant
author_rank: Frequent Contributor
timestamp: July 07, 2016, 08:36:49 pm
content: 5V is great, lets you test modern LEDs. Guess if you're regularly testing something extremely voltage sensitive then its not the meter for you. I've never damaged anything but I'm sure if somebody has you'll hear about it.

author: janoc
author_rank: Super Contributor
timestamp: July 07, 2016, 10:36:29 pm
content: Quote from: pherdie on July 07, 2016, 08:10:47 pmIt is very low current, usually on the order of an 1mA. You are not likely to damage anything with that, even if the component you were testing had a lower breakdown voltage. The higher voltage is needed, otherwise the meter would have problems with LEDs - especially white and blue ones that have 3+ volts forward voltage.On the other hand, that's why humans come equipped with a bulbous hairy protrusion at one extremity of their bodies - to use the brain inside it before using the probes of the meter. If you are testing something super sensitive, then don't use diode check mode, it is that simple.
What is the difference between these Keithley models? - Page 1
Forum section: electronics / testgear

author: walden156
author_rank: Newbie
timestamp: July 07, 2016, 02:50:27 pm
content: I am trying to replicate a test set up.I have a Keithley 237 and a 2002The manual for the tests uses a 437 and a 7002 switchboard.As far as I can tell, the 237 is a voltage/current source/measurewhere 437 is a smaller voltage source, but only an ammeter.So I think I can use the 237 in place of the 437.I can't figure out what the switchboard (7002) does. So far as I can tell, it's only used to measure multiple things at once. Would I be able to switch it out for something else, and measure one at a time instead?Or does something else happen internally?Sorry for the vague information!

author: macboy
author_rank: Super Contributor
timestamp: July 07, 2016, 04:14:19 pm
content: 7002 or 7001 is just a switching system, a multiplexer. No processing at all. Most of the switch cards simply use relays, but they are small signal relays, often with low thermal EMF contacts to minimize errors. You could homebrew something using small signal (or telecom) relays. Don't use power relays.

author: TiN
author_rank: Super Contributor
timestamp: July 07, 2016, 05:07:04 pm
content: Keithley 437? I couldn't find reference to this model number, perhaps typo?Perhaps if you could hint bit more about your test setup requirements, one could suggest more appropriate solution or details if 237+2002 will work.7001/7002 is a switching box for relay and I/O cards.
UEI DM393C bargains on ebay UK - Page 1
Forum section: electronics / testgear

author: mikeys
author_rank: Contributor
timestamp: June 06, 2016, 10:18:18 pm
content: So I found this out a few weeks ago when I picked one up for cheap, but British Gas/Scottish Gas have a rebranded DM393 as part of the equipment for their technicians and they turn up on ebay UK every now and then. Recently they've been going for between £15 and £40 depending on how lucky you get with the auction, but that's a pretty good deal IMO as to buy them new is about £110 over here. Plus the blue holster is pretty nifty. I cracked mine open and it's identical on the inside to a DM393 as far as I can tell. Would advise you to check the mA range fuse though as mine was blown when I received itRecent sales history ->http://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=uei%20dm393c&LH_Complete=1&rt=nc&_trksid=p2045573.m1684

author: CJay
author_rank: Super Contributor
timestamp: June 07, 2016, 06:38:08 am
content: I picked up a couple of them for free from a mate of mine.Nice enough but, honestly, I prefer my ancient Fluke 77, I don't like having multiple functions on the same switch position then having to select with a button.Nice fast continuity buzzer and for the price, I can't complain

author: 56skt29
author_rank: Newbie
timestamp: July 07, 2016, 10:52:10 am
content: I've noticed the DM393 has both DC and AC Voltage in the same switch position, while the older DM391 had them separate. Does it detect automatically the type of voltage it's dealing with, or is this what you're saying you have to select it with a button?I vaguely remember Dave saying that having them in the same switch position is a bad thing, but I really don't know why.

author: CJay
author_rank: Super Contributor
timestamp: July 07, 2016, 11:30:38 am
content: Quote from: 56skt29 on July 07, 2016, 10:52:10 amNo, they don't autodetect, you have to select with the button and it always powers up in AC mode which is a pain for me as I spend most of my time debugging and working with DC.Also you cannot select centigrade or farenheit on the meter, it's factory set and not user selectable but that's of little consequence to me, I have a dedicated dual channel thermometer somewhere if I ever need to measure temperature (I haven't needed to in 15 years or more but you never know...)It's a nice enough meter but as already stated, I prefer my Fluke 77 for daily use.
Rain caused fluke 87 III to beep? - Page 1
Forum section: electronics / testgear

author: nikkoderic
author_rank: Contributor
timestamp: July 09, 2016, 04:33:08 am
content: Hi!Earlier this morning in my country it was raining quite hard. I was outside the house but still covered from rain. I opened my fluke 87 III but it beeped continuously regardless of what function I was in. After few hours, I opened the fluke again and it was no longer bleeping. The rain stopped a few hours earlier before opening it again. I wonder what was really happening or what really caused the beeping or whether or not it's normal. I hope someone can answer. Thanks =D

author: sleemanj
author_rank: Super Contributor
timestamp: July 09, 2016, 04:43:49 am
content: Did you take your fluke from inside a warm environment (house) into a cold environment (outside on a wet cold day)? The dew point change may have caused condensation to form inside the meter.

author: Fungus
author_rank: Super Contributor
timestamp: July 09, 2016, 07:18:51 am
content: Does the 87III have input jack alert? A bit of water in the input jacks could make it beep.

author: nikkoderic
author_rank: Contributor
timestamp: July 09, 2016, 08:14:30 am
content: It might be warmer inside the house but only by a little bit. We don't have any heater or anything like that inside the house. 87III does have input jack alert. Hmm. that might be the cause. Thanks!

author: ebastler
author_rank: Super Contributor
timestamp: July 09, 2016, 04:13:44 pm
content: Quote from: sleemanj on July 09, 2016, 04:43:49 amYou got that the wrong way round. If one takes an instrument from a cold environment to a warm (and especially a warm and humid) one, humidity from the warm air may condense onto the cold instrument parts due to the shift in dew point.
BK 2704C and AMREL AR-3010 multimeters - Page 1
Forum section: electronics / testgear

author: radhaz
author_rank: Regular Contributor
timestamp: July 06, 2016, 01:06:06 am
content: Some Meter Porn.The Amrel is from around the early '90s, the BK from about 5 years ago.[url=https://flic.kr/p/JpL6Nw][url=https://flic.kr/p/JpL9dw][url=https://flic.kr/p/JQxEue][url=https://flic.kr/p/JQxJWR][url=https://flic.kr/p/JHG7Mg][url=https://flic.kr/p/JHG9k6]

author: Vgkid
author_rank: Super Contributor
timestamp: July 06, 2016, 01:23:12 am
content: I used that B&K in my college physics lab.
Fluke 8840A intermittent - relay clicking- resetting - Page 1
Forum section: electronics / testgear

author: salbayeng
author_rank: Frequent Contributor
timestamp: July 05, 2016, 09:50:04 am
content: I found an old post on this topic,https://www.eevblog.com/forum/testgear/fluke-8840a-bench-multimeter/And my 8840 had the same problem, basically you turn it on , it would run for 5 minutes then stop (go blank, relay clicks) then start again, sometimes it would restart in few minutes and then stop again.If you wriggled the case it would restart again. With the cover off , it would work if you pushed down on the piggy back ROM on the CPU (U202) , and stop if you pulled up on it.With some difficulty I replaced the 40pin CPU socket with a nice machined pin socket and though I had fixed it, but nope 10 minutes later, playing up again.I pulled the ROM out, and polished the legs using one of those rubbery abrasive blocks, pushed it back again, working again?... nope.I was getting ready to jam a 20pin machined pin socket into the piggy back one (figuring out the wider pins would make better contact, when I thought, the plastic bit looks removable, so I gently levered it off (with an IC extraction tool) , and, two sockets came away with the carrier! (see photo)A little flux and some very average soldering, and the contacts were back together (see photo).Working fine now no matter how hard you push and pull.

author: mzacharias
author_rank: Frequent Contributor
timestamp: July 05, 2016, 04:29:42 pm
content: Resolder ALL of the mains power transformer connections at the main board. It's easy to miss a couple. The connections might look ok but still not be. Fixed mine.

author: salbayeng
author_rank: Frequent Contributor
timestamp: July 06, 2016, 12:40:37 am
content: That's a good point, that I found in the earlier post .The first place I checked was the transformer, as I found pushing and pulling on the power transformer would sometimes cause my problem.With a naked eye, the transformer joints looked good, but with a microscope you could see fairly poor wetting, I fixed all these joints with some good flux and good solder, and lots of scrubbing with soldering iron tip, but it didn't fix my problem. I also noticed the power rails stayed constant when the 8840 dropped out.
Insulation resistance meter recommendation needed - Page 1
Forum section: electronics / testgear

author: fostwind
author_rank: Newbie
timestamp: July 05, 2016, 07:43:49 pm
content: I'm currently looking for an insulation resistance meter in the US, and in the range of 200-300 US$ (Ideally handheld and digital)I've found some online, but being very new to this type of equipment I just don't know which brands I can trust. (aside from brands like Fluke and Megger which tend to fall well outside of my budget)I'll need it to cover these specs:Insulation test voltages of 100V to 1000VInsulation resistance measurements of 10K? to 1G?AC/DC voltage measurement range of 0 to 400VLow resistance range of 0.05? to 150?. Up to 200mAAs far as I've seen, those are fairly mild specs and most meters will cover them. Obviously, anything that exceeds those ranges is fine as long as it falls within my budget.Brands I've come across online (Amazon and eBay) include Mastech, UNI-T, AEMC, Reed, Extech, Amprobe. I'm completely unfamiliar with all of them.Any recommendation (be it of a specific model, or just a brand) is extremely welcome.I'm sorry if this has already been asked. I did a search but couldn't find anything that matched what I need.Thank you.

author: rsjsouza
author_rank: Super Contributor
timestamp: July 05, 2016, 11:30:46 pm
content: Check my impression of the UT513:https://www.eevblog.com/forum/testgear/anyone-with-experience-on-these-uni-t-ut5111213/msg920087/#msg920087
A clamp meter to electronics and electrical? - Page 1
Forum section: electronics / testgear

author: joao
author_rank: Newbie
timestamp: July 09, 2016, 12:03:12 am
content: Hello!I already have a Amprobe 37XR-A multimeter and wanted to buy a second meter. As I also like to make some electrical work, I thought about buying a clamp meter. After researching, I'm undecided about these two models:Amprobe ACD-14-PRO-EURhttp://www.beha-amprobe.com/en/products/clamp-meters/acd-14-pro-eur-0Amprobe AMP-220-EURhttp://www.beha-amprobe.com/en/products/clamp-meters/amp-220-eurAny suggestion? Thanks.

author: SkyMaster
author_rank: Frequent Contributor
timestamp: July 09, 2016, 02:46:17 am
content: According to the datasheet, the ACD-14-PRO-EUR can measure DC current down to the µA range. It can also display voltage and current at the same time.

author: HKJ
author_rank: Super Contributor
timestamp: July 09, 2016, 07:11:20 am
content: The uA is not with the clamp.When looking for clamps that can be used for electronic, look for DC measurement on clamp and how low it goes.I like my Extech 380942 clamp meter, it can measure mA on the clamp, both AC and DC, maximum range is 30A AC/DC.

author: TheAmmoniacal
author_rank: Unknown
timestamp: July 09, 2016, 07:21:56 am
content: http://www.banggood.com/UNI-T-UT210E-Auto-Range-True-RMS-Clamp-Multimeter-Ammeter-Voltmeter-Resistance-Frequency-Temp-Tester-p-1027721.html

author: Silveruser
author_rank: Regular Contributor
timestamp: July 10, 2016, 12:24:13 am
content: One of my main uses for clamp meters is measuring inrush or peak current. This is useful around motors and such. The ACD-14 seems to measure inrush, not sure about the other. It might be a feature to consider.George
Sigilent enter in the Free upgrad batle - Page 1
Forum section: electronics / testgear

author: ebclr
author_rank: Super Contributor
timestamp: June 30, 2016, 01:31:09 pm
content: When you are going to purchase an oscilloscope of the Siglent SDS1000X or SDS1000X+ series, you are getting the signal decoder option for free! Valid until 26th July 2016. For more details, please click on the link below:SDS1000X:http://www.batronix.com/goto/to.pl?l=nle1606eWhen you are going to purchase an oscilloscope of the Siglent SDS2000X series, you are paying the price of the next lower bandwidth device.Valid until 30th June 2016. For more details, please click on the link below:SDS2000X:http://www.batronix.com/goto/to.pl?l=nle1606f

author: tautech
author_rank: Super Contributor
timestamp: June 30, 2016, 08:47:11 pm
content: Yes there have been various factory promotions and competitions, they are listed here, current and expired:http://www.siglent.com/ENs/qyxw.aspx?id=205Some even have their own threads:https://www.eevblog.com/forum/testgear/siglent-special-offers-on-the-sds2000x-series/We dealers also get offered run out deals from time to time......
UNI-T UTP3000TFL series power supplies - Page 1
Forum section: electronics / testgear

author: Ghydda
author_rank: Regular Contributor
timestamp: July 05, 2016, 08:23:34 am
content: Hi,I'm browsing for a cheap and cheerful power supply for general lab-use.You know, the usual 30V/3A deal.In that search I have come across theUTP3313TFLandUTP3315TFLfrom UNI-trend.I can't find much about it on the web (reviews, articles, user stories aso). But I like the look if it, the form factor, and the fact it is a linear regulated supply.Besides having an opinion on the matter, does anybody actually own one of these - and if so, what is it like?I'm looking for information on build quality, care to details, everyday use, and if possible pics of the internals.Cheers,/Ghydda
Cheap ScopeDMM - Page 1
Forum section: electronics / testgear

author: MosherIV
author_rank: Super Contributor
timestamp: June 30, 2016, 01:51:44 pm
content: HiJust though some of you might be interested in this :special offer on cheap scopemeterhttp://cpc.farnell.com/uni-t/ut-81b/handheld-oscilloscope-8mhz/dp/IN0548761Just £135.012(Only 3 left)
Mastech MS5308 , trying to find range of capacitance  - Page 1
Forum section: electronics / testgear

author: KD0CAC John
author_rank: Frequent Contributor
timestamp: June 29, 2016, 08:01:47 pm
content: Range of measuring capacitance ?Nothing in manual , nothing in a few sales places , did 2 searchers here .

author: highwayman
author_rank: Contributor
timestamp: June 30, 2016, 01:31:32 pm
content: Max capacitance depends on the frequency that the capacitor is tested.http://micromir-nn.ru/RLC/MS5308_english_manual.pdf
Need: service manual or schematics for AOIP MN5122 bench multimeter - Page 1
Forum section: electronics / testgear

author: concerto51
author_rank: Newbie
timestamp: June 29, 2016, 08:36:27 am
content: I've just bought a french AOIP MN 5122 bench multimeter from a surplus store. It's functional but needs calibration .Anybody has a service manual or tell me where to download one?Thanks very much for your helpLorenzo
Sanwa PC 773 Multimeter - (and hello world!) - Page 1
Forum section: electronics / testgear

author: Pablo-NF
author_rank: Newbie
timestamp: June 20, 2016, 03:25:35 am
content: Hello to everyone !Since this is my first post in the EEVblog community I might as well present myself.My name is Pablo, I am 27 years old, and I live in Argentina and after years of watching Dave`s videos, I finally decided that it would be nice to get into electronics, at least from a enthusiastic hobbist point of view!Even tho I do not have any formal education in electronics engineering (I do in process/chemical engineering), I have been always interested in the subject, so what better way to get started than a little project? (nothing to get excited about, just a little power supply!)As in any project, basic tools are needed. To adress this issue got myself a multimeter, trying to balance measurement performance and safety (or was it cost?.. oh well).After watching reviews, teardowns, whats available on the local market, as thread subject says, got myself a Sanwa PC 773 multimeter(in the hopes of it being decent).Since the tradition of the EEVblog is not turning on stuff, but taking them apart... Attached are some pictures of the multimeter partially opened.I am no specialist to judge, therefore it would be really nice to have everyones insights on this multimeter, what do you think of the design, safety, and claimed performance !At least the build quality feels OK, lettering looks good. Actually, the injection molding and rubber overmolding look really good on this unit.Specwise, the following is claimed: 11.000 counts true-RMS multimeter. Spec details in the following link:http://overseas.sanwa-meter.co.jp/items/detail.php?id=17#All comments are welcome ! Thanks everyone in advance !Cheers, Pablo.

author: radhaz
author_rank: Regular Contributor
timestamp: June 20, 2016, 05:24:56 am
content: A very nice meter. It should last a long time. The Japanese tend to make products that won't kill their users.

author: Pablo-NF
author_rank: Newbie
timestamp: June 29, 2016, 03:22:35 am
content: Thanks for your reply ! I hope so too !If anyone is interested, or wants more details, I will be happy to provide in any way I can.Cheers !
Agilent 6627A DC Power Supply - Page 1
Forum section: electronics / testgear

author: EVlab
author_rank: Contributor
timestamp: June 28, 2016, 06:54:15 am
content: I have some question regarding the use of this nice supply and could not find any answers in the user manual.Maybe someone can help out?-> Is it possible to configure the power-on state of the outputs to “DISABLE”?-> Is there a way to switch on/off all outputs simultaneously?Best regards, Simon

author: hendorog
author_rank: Super Contributor
timestamp: June 28, 2016, 07:10:25 am
content: http://literature.cdn.keysight.com/litweb/pdf/06626-90001.pdf?id=1000000433-1:epsg:manLooks like you can change the power on state using GPIB and STO 0 command - page 71:page 75 has some info about saving all of the output states and restoring them all at once via GPIB.Edit: Also on page 89 it shows how to do it from the keypad.I've got one of these, but it takes up too much space so its under the desk at the moment. I don't have a GPIB adapter though so haven't experimented with that.

author: EVlab
author_rank: Contributor
timestamp: June 28, 2016, 07:52:22 pm
content: update:The command DCPON allows to set the state of all outputs at power-on.This state will be saved in EEPROM automatically.BUT: How do I turn on/off all outputs simultaneously during operation?

author: hendorog
author_rank: Super Contributor
timestamp: June 28, 2016, 08:25:40 pm
content: When I pointed you to page 89 in the manual I was thinking you could do this:Set all channels to 0v and save to register 1STO 1 EnterThen set the voltage you want and save to register 2STO 2 EnterThen RCL 1 Enter turns them off, and RCL 2 Enter turns them on.The manual says that disabling an output just sets it to 0v and a very low current limit.

author: bitseeker
author_rank: Super Contributor
timestamp: June 29, 2016, 12:18:57 am
content: Quote from: hendorog on June 28, 2016, 08:25:40 pmThat's interesting. Saves cost of relays?

author: hendorog
author_rank: Super Contributor
timestamp: June 29, 2016, 12:28:46 am
content: Quote from: bitseeker on June 29, 2016, 12:18:57 amHeh, yeah. And it seems that if you want that feature, you have to pay for it - and supply your own relays:http://ridl.cfd.rit.edu/products/manuals/Agilent/power%20supplies/CD1/model/Opt750.pdf

author: bitseeker
author_rank: Super Contributor
timestamp: June 29, 2016, 02:25:05 am
content: I guess that's a feature so that you can have your choice of electronically controlled switch.
HP 3478A fuse size? - Page 1
Forum section: electronics / testgear

author: shloms
author_rank: Newbie
timestamp: June 27, 2016, 11:36:07 am
content: Hi,Couldn't find info on the fuse size for the HP 3478A, service manual only lists the HP part number, and searching for this does not help.Anyone knows the physical size please?

author: Martin.M
author_rank: Frequent Contributor
timestamp: June 27, 2016, 12:03:58 pm
content: the fuse current for the power supply is relatet to the voltage you have there. Written on the back side of the instrumentthe Fuse for the current input is a 3A - 250V american size 1.25x 0.25see page 3.3 in the service manual, at the picturegreetingsMartin

author: shloms
author_rank: Newbie
timestamp: June 27, 2016, 01:36:16 pm
content: Thanks Martin.I'm referring to the PSU mains fuse. I need to know the physical size of it.Sorry, I should have stated that initially.

author: shloms
author_rank: Newbie
timestamp: June 27, 2016, 09:15:17 pm
content: Martin or others, could you please check the dimensions of the mains fuse? (the one in the back, for the PSU)

author: MarkL
author_rank: Unknown
timestamp: June 28, 2016, 02:51:41 pm
content: Same physical size 1+1/4" x 1/4".Says SOC SS2, 250mA 250V on it. This is the correct current rating for 125V mains.http://socfuse.com/products/pdf/P58_E.pdf

author: shloms
author_rank: Newbie
timestamp: June 28, 2016, 07:40:52 pm
content: Thank you very much, MarkL.Yes, For me the voltage is 230, so it will be 125mA.
CALKIT file for an 8714C RF Network Analyzer - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: June 28, 2016, 02:59:18 am
content: Hi All,I'm trying to write my own cal kit file for this network analyzer and I'm having the devils own time trying to get it working.No matter what I do the 8714C says "Recall of cal kit failed". These files don't seem complex but there is clearly something I'm missing.Here is my file as an image:I've tried different character encodings, using on CR, only LF, etc but to no avail.Does anyone have an actual working cal kit file they could just send me so that I can see what the difference is between mine and that one?Any hints/thoughts?My actual file is herehttps://1drv.ms/u/s!Amqar8_XQ9Uzjfs_npDiY8efXqtQdgThanks,TonyG

author: hendorog
author_rank: Super Contributor
timestamp: June 28, 2016, 04:03:02 am
content: Just a couple of guesses until someone who really knows comes along:I noticed that the last line does not have a CRLF.Sometimes adding a trailing CRLF helps if the software reading the file is looking for them.Also zo or Z0 (zero)?This doc is for an 8714ET and has Z0:http://www.esm.psu.edu/courses/ESC400H/ESC400NetworkAnalyzer.pdfThis older doc has zo - but it has other inconsistencies (e.g. CO vs C0) and maybe old enough to have been re-typed by a typist/WP operator:http://exodus.poly.edu/~kurt/manuals/manuals/HP%20Agilent/HP%208712C,%2014C%20User.pdf

author: G0HZU
author_rank: Super Contributor
timestamp: June 28, 2016, 11:54:49 am
content: Yes, my custom calkit files for my old HP8714B use Z0i.e. uppercase Z and a zero character (and not the letter o)So I agree that you should try changing zo to Z0The other thing is that my old calkit files don't have the $ and the comments after it on each line. My HP8714B is effectively retired (and put into storage) now as I've upgraded from it so I can't easily try any edits to prove any of this.

author: Tony_G
author_rank: Super Contributor
timestamp: June 28, 2016, 04:42:00 pm
content: You guys are AWESOME with a capital AWE.Changing from lower case 'zo' to uppercase Z and numeral 0 fixed the problem.HP has that same lowercase 'zo' thing in several manuals so it was completely misleading.Thanks again.TonyG