hybridfree/eevblog-posts huggingface dataset:
Teardown Beta 1760DGT Digital Multimeter - Page 1
Forum section: electronics / testgear

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:03:02 am
content: Hi everyone,I'm Hayder from IRAQ, and I'm new to this forum... this is my first post.I'm Really interesting about the topics of this forum and EEVBlog channel in YouTube,I really like the idea of Teardown DDM, I'm interesting in Embedded system and PCB design and also I'm thinking in making Open Source DMM in future maybe.I'd like to share with you in my first post some photo of Teardown Beta Multimeter, I's not my device, it for my father, and I stole it to make the Teardown with out his permission, maybe I'll tell him laterthe price of this device is about 282 $ in amazon,Beta 1760DGT Digital MultimeterLink from Amazon Belowhttps://www.amazon.com/Beta-Tools-17600005-1760DGT-Multimeter/dp/B001ODPEFS/ref=sr_1_1?ie=UTF8&qid=1484382825&sr=8-1&keywords=Beta+1760+DGTafter what the video of EEVBlog and read the thread in this forum I learn little things about how to determine if Multimeter quality made and worth the price or not?I really want to read your opinion about the device since there is no review or video for this DMM.Photos in attachments also.Kind Regards

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:05:23 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:08:49 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:11:30 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:20:26 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:22:59 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:28:15 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:30:52 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:33:43 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:36:12 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:43:33 am
content: another photos

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 09:59:30 am
content: Last photos

author: mos6502
author_rank: Frequent Contributor
timestamp: January 14, 2017, 10:56:39 am
content: I's pretty bad. Cheap PCB, glass fuses, no precision voltage divider. And WTF happened to R4?Considering that for less than half the price, you can get a Brymen BM319s, or much better, for the same price a used Fluke 88, I definitely wouldn't recommend it.

author: Hayder
author_rank: Contributor
timestamp: January 14, 2017, 11:05:27 am
content: Quote from: mos6502 on January 14, 2017, 10:56:39 amthank for reply, that was my opinion too.
Looking for a manual for the Schaffner NSG 225A burst simulator - Page 1
Forum section: electronics / testgear

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 06, 2017, 08:47:07 am
content: Does anyone have a pdf manual for the Schaffner NSG 225A?Or a physical instrument for sale?

author: MartinX
author_rank: Regular Contributor
timestamp: January 06, 2017, 10:44:46 pm
content: I have one at work, maybe there is a manual, but why do you need it? It is pretty simple to operate almost self explanatory. It does not comply to any modern standard after 1995.

author: AndersJ
author_rank: Frequent Contributor
timestamp: January 07, 2017, 05:01:57 am
content: I want the manual so I can see the 225A capabilities.Yes, its old, but I don't think I need full compliance to modern standards.A modern generator is very expensive,and I like the ease of use that legacy devices provide.Last but not least,older Schaffner manuals often include schematics,very useful, especially for older equipment that might need repairing.I see from the flag that you are in Sweden.Perhaps I could borrow the manual for copying?Is your 225A for sale?/AJ

author: MartinX
author_rank: Regular Contributor
timestamp: January 13, 2017, 10:43:05 pm
content: Bad news, there were no manual at work, and the generator is not for sale sorry.
What does the ethernet interface do on a R&S HMO1002/1202 scope ? - Page 1
Forum section: electronics / testgear

author: Rolo
author_rank: Regular Contributor
timestamp: January 13, 2017, 03:30:40 pm
content: Recently been looking at the R&S HMO1002/1202 series scopes, I did find a lot of information but I'm can't find much about the ethernet interface. Are there any owners of this scope that can tell more about how the ethernet interface is being used ? The manual says that it provides a web interface and dedicates a whole page to the IP numbering system but not much info on the contents of this web interface. Can you do settings only, or does it show the scope screen ? Or both ?Would like to see some sceenshot of what's going on in the webinterface.Thanks !

author: H.O
author_rank: Frequent Contributor
timestamp: January 13, 2017, 06:26:40 pm
content: I think the MAIN purpose of theEthernet interfaceis to provide the possibility of remote xontrol thru SCPI programming. Here's a link to theHMO1002/1202 SCPI Programmers manualAs far as the built in web server/page the manual does sayQuoteSo, without having tried it (I have one at work) I'd guess theweb interfacedoesn't really do much except show some information.
Feel tech FY3224s vs MH Instek MHS 5400a signal generator - Page 1
Forum section: electronics / testgear

author: rad400
author_rank: Contributor
timestamp: January 12, 2017, 02:07:32 pm
content: I have been looking to low cost freq Gen and was looking at both the Feetech FY3224s and the HM Instek HMS5400a which are very similar to each other for price and Freq range. Initially was going with the Feeltech but after reading the leakage/power supply issues, not sure now. Any thoughts of which would be a better.Thanks,RAD400
Teardown & Repair of an Agilent 8164A Lightwave Measurement System - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: January 16, 2017, 05:41:02 am
content: You can watch the video here: [58 Minutes]youtu.be/tYMynoQiM0wMore videos at The Signal Path:http://www.TheSignalPath.com

author: Hugoneus
author_rank: Frequent Contributor
timestamp: January 17, 2017, 05:06:24 am
content: If anyone has a laser module (like the one which fails alignment) please let me know.
Recommendations for high frequency power analyzer - Page 1
Forum section: electronics / testgear

author: offshorebear
author_rank: Newbie
timestamp: January 06, 2017, 01:20:40 am
content: Hello,I am looking to measure the output power of electronic ballasts operating from 50 khz to 150 khz, with up to 2000 V starting voltage. My google-foo can only find analyzers rated up to 1000 p-p V. Anyone have any suggestions for a higher rated unit?Alternately can any of these newer oscilloscopes do the math for power calcs when voltage and current are out of sync and different wave forms?Thanks!

author: turbotemp
author_rank: Newbie
timestamp: January 06, 2017, 08:45:19 pm
content: Which type of lamps are you testing and what level of accuracy do you need? it gets exponentially more difficult with increasing accuracy requirements.

author: offshorebear
author_rank: Newbie
timestamp: January 06, 2017, 11:57:12 pm
content: Is 1% feasible?Medium pressure UV. Would be nice to measure 20kW but I'd settle for 6kW.Thanks!

author: 1audio
author_rank: Frequent Contributor
timestamp: January 07, 2017, 12:52:39 am
content: I assume you looked at this:http://clarke-hess.com/products/2335a/Contact them about scaling the voltage. Possibly a simple 10X divider would get you where you need to be. You may be able to find an older version on ebay for lots less.

author: turbotemp
author_rank: Newbie
timestamp: January 11, 2017, 11:04:41 pm
content: Quote from: offshorebear on January 06, 2017, 11:57:12 pmI was checking out the specs on Yokogawa's high end meter 3000 or something and its rated 0.014 x KHz % of reading+0.3% of rangethis means you're going to be at +/- 1.7% at 100KHz. Is it liquid or air cooled?With 20kW output, you have got to have good 1-2kW of ballast loss which would allow reasonably accurate thermal measurement not too far off from above.You'd measure the input power at line frequency which can be done to fractions of percent with a relatively cheaply leased power analyzer and use the coolant flow rate or draw entire cooling air flow through mass air flow sensor and deduct this from the input power. You could alternatively put a pass-through water heating element downstream of ballast and feed power to the element through a variac and through a second channel of the power meter. You adjust the power so delta T in coolant across ballast and delta T across heater matches.Deduct this value from total input and you have the lamp wattage.
Brymen bm257s accessories? - Page 1
Forum section: electronics / testgear

author: baastrup
author_rank: Contributor
timestamp: December 29, 2016, 09:14:27 am
content: Hi.I'm looking for accessories for my bm257sHas anyone tried these snap-on clips?https://www.welectron.com/Brymen-BAC3-Snap-On-Alligator-Clips?And will they fit?And what PC cables accessories would I need to be able to connect it to a PC via USB?

author: cs.dk
author_rank: Unknown
timestamp: December 29, 2016, 10:24:07 am
content: They will fit the standard probes fine. They even fit my Fluke TL-175 probes as well.For PC connectivity you would need this kit;http://www.tme.eu/en/details/kitbrua-20x/meters-software/brymen/

author: baastrup
author_rank: Contributor
timestamp: January 11, 2017, 12:32:22 pm
content: brought it from here:https://www.welectron.com/navi.php?suche=brymen&seite=2
HP3563A upgrade with Newscope 5 display unit. - Page 1
Forum section: electronics / testgear

author: Alex Nikitin
author_rank: Super Contributor
timestamp: January 07, 2017, 10:23:14 pm
content: The HP3563A Control Systems Analyser in my lab was not getting much use, for two reasons - one is the fan, which is so loud that it is impossible to sit next to the unit without incurring a bad headache after an hour or so, and the second is a somewhat aged CRT display with blurry lines, which has also developed a strange kind of a whistling sound for first 30-40 minutes of operation. I was planning to upgrade the display with the Newscope 5 LCD screen available for some time now and the display has arrived over a month ago. At last today I've found some time to do it, as well as to check the type of fan I need to get (and to promptly order it from RS as the exact model is still available after 25 years).I guess I will be using the analyser a lot after I'll replace the fan in few days time. Here are some photos - I have to say the upgrade went very smoothly and the instructions for the display unit are very good.CheersAlexThat is how the display looked a while ago:Now to the rest:

author: radhaz
author_rank: Regular Contributor
timestamp: January 07, 2017, 11:35:05 pm
content: That's pretty impressive.

author: cdev
author_rank: Super Contributor
timestamp: January 07, 2017, 11:55:53 pm
content: So, its now color- that's really nice.How does it determine what colors to use where?

author: Alex Nikitin
author_rank: Super Contributor
timestamp: January 08, 2017, 12:07:31 am
content: Quote from: cdev on January 07, 2017, 11:55:53 pmAccording to the manufacturer, the colours chosen are close to what later similar HP/Agilent equipment used. There are four colour schemes (user selectable by rotating the focus pot at the back of the analyser), including the original mono green.CheersAlex

author: Alex Nikitin
author_rank: Super Contributor
timestamp: January 08, 2017, 12:18:25 am
content: Here is the fan.CheersAlex

author: Keicar
author_rank: Regular Contributor
timestamp: January 08, 2017, 12:32:10 am
content: Very impressive result - I'd consider the Newscope LCD kit for my 3562A (same issue, gets a bit smeary once you turn the intensity up far enough to see anything) were it not for having a spare (NOS) CRT stowed away in a box under the bench (I'd feel guilty for not using it).Cheers,Karl.

author: shteii01
author_rank: Frequent Contributor
timestamp: January 08, 2017, 12:40:49 am
content: Drop some oil into the hub. Might solve your noise issue.Quote from: Alex Nikitin on January 08, 2017, 12:18:25 am

author: Alex Nikitin
author_rank: Super Contributor
timestamp: January 08, 2017, 12:52:38 am
content: Quote from: shteii01 on January 08, 2017, 12:40:49 amMaybe - and not for very long anyway. The replacement fan will be here on Tuesday, so I would rather do it properly.CheersAlex
'EEVBlog' BM235 - case? Follow up - Page 1
Forum section: electronics / testgear

author: Testing123
author_rank: Contributor
timestamp: November 29, 2016, 06:03:47 pm
content: Quote from: EEVblog on May 30, 2016, 04:57:59 amHi Dave,It’s been 6 months now… just wondering what the status is on the BM235 case.I hope it's still going to become a reality.

author: Testing123
author_rank: Contributor
timestamp: January 05, 2017, 02:47:22 pm
content: Answer to the above posed question in the following thread:https://www.eevblog.com/forum/testgear/'eevblog'-bm235-case/
Avoiding Mastech MS8218 knockoffs - Page 1
Forum section: electronics / testgear

author: ziplock9000
author_rank: Regular Contributor
timestamp: December 28, 2016, 04:38:11 am
content: I'm looking to buy a Mastech MS8218 in the UK. While looking on eBay and Amazon, the prices vary from £111 to £150.. But some of them have the "Mastech" label in red in the top left of the DMM, while others are in white for the exact same model :/Alarm bells went off instantly.Red - £111 - Chinahttp://www.ebay.co.uk/itm/MASTECH-MS8218-USB-DMM-Digital-Multimeter-True-RMS-dB-Meter-50000-Counts-F3H1-/222237368039?hash=item33be611ee7:g:x5YAAOSwknJXyBHMWhite - £145 - Chinahttp://www.ebay.co.uk/itm/Newest-Mastech-Ms8218-Pc-Auto-Range-Multimeter-True-Rms-Rs232-50000-Counts-Dmm-K-/131793025078?hash=item1eaf79f836:g:v04AAOSwKOJYHYqQI don't mind products from China or even knockoffs as long as the quality and specs are as good.Are the red ones just bad?

author: ProBang2
author_rank: Frequent Contributor
timestamp: December 29, 2016, 09:13:25 am
content: The "red one" seems to be the better choice.At least it offers (and shows in the pics) an USB connection.The "white one" mentions only a RS232 cable...

author: ziplock9000
author_rank: Regular Contributor
timestamp: December 29, 2016, 09:14:56 am
content: Quote from: ProBang2 on December 29, 2016, 09:13:25 amSo they are both knock offs then and can't be trusted?Where can I reliably get one for a good price?

author: ProBang2
author_rank: Frequent Contributor
timestamp: December 31, 2016, 12:42:37 am
content: Don´t panic.The "white one" is simply an overpriced old device.Mastech changed the colour of their label on newer ones to red.Today both colours are in use.The "red one" is newer but outdated too. The MS8218 is out of production.It was never a bestseller. Hence there is no one who wants to copy it...My recommendation would be:Take instead a Brymen BM857s (maybe even a BM859s).* 50 000 Counts (500 000 Counts at Volt DC)* Faster display and bargraph* Much safer (independent tested), much better build quality* more reliably* You have a usable warrantyWhere? Look here:TME Europe(<-- Click me, I´m a link...)Disadvantage: The USB connection cable is not included... (BTW: The cable for the BM867/BM869 works too.)

author: ziplock9000
author_rank: Regular Contributor
timestamp: December 31, 2016, 10:28:23 am
content: Quote from: ProBang2 on December 31, 2016, 12:42:37 amThanks mate. I'll take a look. Are Brymen a German company? (As you know in Europe we pay more for US made goods)

author: wraper
author_rank: Unknown
timestamp: December 31, 2016, 11:52:43 am
content: Quote from: ziplock9000 on December 31, 2016, 10:28:23 amBrymen is a Taiwanese company which makes high quality test equipment. Mastech is a Chinese company which makes meters of medium crappiness.

author: crazyguy
author_rank: Regular Contributor
timestamp: January 05, 2017, 11:14:30 am
content: red one is new designwhite one is oldhttp://www.crystalradio.cn/thread-512817-1-20.html
Quick Teardown: Toellner TOE8815-32 32V 10A Linear Arbitrary Power Supply - Page 1
Forum section: electronics / testgear

author: sorenkir
author_rank: Regular Contributor
timestamp: January 08, 2017, 02:02:52 pm
content: One of my last "scores": this TOE8815-32 32V 10A (320W) PSU of 2000 vintage. It has arbitrary function (1000 steps), GPIB. The user interface is not intuitive but I managed to get the user manual from Toellner Germany to be able to program it.A huge (434x132x437 mm) and heavy beast (23 kg).A look inside explains this: two big transformers, one massive heatsink (under the shield on the top) with fan:Regulation is based on classical series regulator. It involves two big rows of TIP3055 transistors:Close-up on the transistors (and flux residue!) :Not quite easy to put on the bench, but I could not resist (one cannot have too many PSUs)!Michel.
Can't Get RS232 Working With UNI-T UT61E - Page 1
Forum section: electronics / testgear

author: KennyPowers55
author_rank: Newbie
timestamp: December 30, 2016, 01:53:51 am
content: I received a new UT61E and I am unable to get the serial connection to work. I am aware it may be my RS232 to USB adapter, but I noticed my optical to serial adapter only has one sensor on the meter end, where as all the pictures I see there should be two "dots" (transmitter and receiver I presume). Can anyone confirm that the meter end of the serial cable should have two "dots"?This is my first post. I bought this meter after google brought me here and I did some reading up. Please go easy on me. Thanks.KP

author: jm_araujo
author_rank: Regular Contributor
timestamp: December 30, 2016, 10:35:27 am
content: It only has 1 "dot". The cable only reads data from the meter.Most likely it's the USB-RS232 adapter.

author: KennyPowers55
author_rank: Newbie
timestamp: December 30, 2016, 07:10:54 pm
content: Thanks! New USB adapter is on the way.

author: KennyPowers55
author_rank: Newbie
timestamp: January 04, 2017, 11:58:37 pm
content: Got a Sabrent FTDI adapter and it appears to be working. Thanks!
HP 6632A Power Supply Fan Silencing - Page 1
Forum section: electronics / testgear

author: compgeke
author_rank: Newbie
timestamp: January 05, 2017, 03:56:24 am
content: Recently I picked up an HP 6632A quite cheaply, under $75 shipped. The thing works great with the slight exception of the fan being loud.(see 1st image)Being as I plan on using this on my desk, I wanted to quiet it down but I don't want to have it over heat from throwing some low power low noise fan in that barely moves 12 CFM. After some searching around I found there are some fans with built in thermal couples for adjusting their speed without outside control but they aren't particularly easy to find for 60mm. That's wherethis board I found on amazon comes in. It's a stand alone fan controller, it takes 12V input (just what the 6632A uses) and can control 1-3 fans via PWM adjusting speed based on the temp it senses on its thermal couple.The installation went pretty easy, I skektchily mounted it with a bolt and some insulation to an existing hole in the chassis and wired it all up. I have the board jumpers set for 40% minimum fan speed, ramp up past that at 35*C and hit 100% at 45*C. From testing with jumpers initially set for 40*C, it'll keep it right at 40 (see the last image). With jumpers set to 35 it'll keep it around 36 as per the Fluke 52 (last calibrated in '95, take it with a grain of salt).See the pictures for the installation. I assume if anyone else wants to do this you'll be able to figure it out on your own, if not you shouldn't be opening this up.And for more pics,http://imgur.com/a/vgK5E. The forum threw a "Maximum 2000KB blah blah" when trying to add them all. It's like I'm living in 2004 again.

author: mtdoc
author_rank: Super Contributor
timestamp: January 05, 2017, 04:29:36 am
content: Quote from: compgeke on January 05, 2017, 03:56:24 amThis Vantec 60mm temp controlled fanworks great. I've used it on 2 retrofits now, including a HP 6632A. It's quiet and can move plenty of air if things get hot enough. That board you're using looks like a reasonable solution as well.

author: Micke
author_rank: Regular Contributor
timestamp: January 05, 2017, 08:18:35 am
content: After seeing HighVoltage´s hint in this threadhttps://www.eevblog.com/forum/testgear/agilent-34410a-noisy-fan/msg486137/#msg486137I bought a couple of these high quality 60mm PAPST 612MI fans with integrated speed controller:http://www.ebay.com/itm/162257691307?ul_noapp=trueDespite auction say only shipping to Germany, it was no problem buying living outside Germany.I planned to put this in my loud Agilent E3645A PSU, however I noticed you must connect a small dummy resistor in parallel with the fan to increase the power consumption a little, since the PSU monitors the current and beeps and gives an error message if the current is too low. Quite handy, the original connector on the fan fits the PSU (but the polarity is reversed though, so removing the sockets and reversing them was needed...)
Questions About Ancient HP 3300A Function Generator - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: January 03, 2017, 12:21:36 am
content: So long, and thanks for all the fish.

author: Andy Watson
author_rank: Super Contributor
timestamp: January 03, 2017, 01:20:56 am
content: Doh! Managed to delete rather than edit my post!The schematic shows a fuse and a power switch in one line. The other line leads to the transformer and the voltage selector switch. I would connect the Hot to the fuse/power switch line. It should be easy to trace the appropriate wire back to the fuse holder.

author: tautech
author_rank: Super Contributor
timestamp: January 03, 2017, 05:44:55 pm
content: Google "dim bulb tester" and knock one together.You'll recover the small time and cost to make one in money saved from saving fuses.

author: tautech
author_rank: Super Contributor
timestamp: January 03, 2017, 06:09:13 pm
content: Quote from: Roy Batty on January 03, 2017, 06:02:59 pmIt's wise to place at least a dim bulb tester in the mains supply of ANY equipment that's been unused for some time and if all seems well then a Variac turned down some to let the E caps reform to their correct values.

author: SeanB
author_rank: Super Contributor
timestamp: January 03, 2017, 08:11:40 pm
content: My bet is C7 or C8 on the mains input side have crazed and gone short circuit. Those Rifa clear case capacitors strike again.

author: tautech
author_rank: Super Contributor
timestamp: January 04, 2017, 01:02:51 am
content: Quote from: Roy Batty on January 04, 2017, 12:36:47 amExactly. Values are not critical.
UT136C Temperature reading problem - Page 1
Forum section: electronics / testgear

author: s1m
author_rank: Newbie
timestamp: January 03, 2017, 02:29:25 pm
content: Hi, I just received a UT136C multimeter from gearbest but I have a problem with temperature reading. It always show OL. What does that mean? The probe is connected properly to the right slot. Maybe my multimeter is defective?

author: Lightages
author_rank: Unknown
timestamp: January 04, 2017, 12:14:55 am
content: Don't repeat questions on two threads. I answered your question in the other thread.
Brymen BM233 wrong value fuse - Page 1
Forum section: electronics / testgear

author: PeterMadach
author_rank: Contributor
timestamp: January 04, 2017, 09:15:28 pm
content: So I picked up a BM233 from TME in Europe and I was all happy and everything until I opened up this puppy, and I saw that it has different amp rated fuses than it says on the silkscreen. To be exact, instead of a 600mA on the mAmps range it has a 400mA, and instead of the 10A on the Amps range it has a 11A HRC fuse. Should I contact support or just close it and don't bother?

author: retiredcaps
author_rank: Super Contributor
timestamp: January 04, 2017, 10:06:23 pm
content: Read your manual. 400mA is the correct fuse for it.Also, this exact same question was just asked today athttps://www.eevblog.com/forum/testgear/fuse-replacement-for-eevblog-meter/
GPIB or HP-IB with HP 8595E Spectrum Analyzer? - Page 1
Forum section: electronics / testgear

author: RCHRDM
author_rank: Regular Contributor
timestamp: December 31, 2016, 07:13:12 pm
content: I just got an Agilent GPIB or HP-IB USB adapter that works great on my Agilent signal generator (at least to send commands). However, when I plug it into my HP 8595E spectrum analyzer, the Keysight Connection Expert does not seem to recognize the instrument. It sees the HP-IB address (18) but shows no connection.Is there different software or a different procedure to use here? I thought that GPIB or HP-IB was the same for all instruments, old or newish.Richard

author: bingo600
author_rank: Super Contributor
timestamp: January 01, 2017, 11:51:17 am
content: GPIB/HPIB is 2 names for the same "electrical interface"That said , the instrument commands are different for many instrument types (classes) , and expecially if it's pre SCPI.It might be that the sw doesn't support the SA , have you verified that it does ??/Bingo

author: HighVoltage
author_rank: Super Contributor
timestamp: January 01, 2017, 12:19:31 pm
content: The old HP SA have no SCPI support.Take a look here, this is may be what you are looking forhttp://www.ke5fx.com/gpib/readme.htmThe KE5FX GPIB Toolkit is a collection of free Windows utilities that will help you make and record research-quality measurements with GPIB-based electronic test equipment.This is version 1.971 of the Toolkit, released October 28, 2016.

author: pe1oxp
author_rank: Regular Contributor
timestamp: January 01, 2017, 12:52:40 pm
content: Manual sending *IDN? should work.Haven't connected my 8594E at the moment so I can't verify it.

author: HighVoltage
author_rank: Super Contributor
timestamp: January 01, 2017, 01:46:55 pm
content: Quote from: pe1oxp on January 01, 2017, 12:52:40 pm*IDN? is a SCPI command, NOT working on most of the older HP gear.Most likely the HP Spectrum Analyzer will not respond at all.

author: MarkL
author_rank: Unknown
timestamp: January 01, 2017, 02:09:41 pm
content: The command is "ID". It will return the model number:HP8595EProgrammer manual here:http://literature.cdn.keysight.com/litweb/pdf/08590-90235.pdf

author: pe1oxp
author_rank: Regular Contributor
timestamp: January 01, 2017, 02:17:24 pm
content: Quote from: HighVoltage on January 01, 2017, 01:46:55 pmYou are right, according to the programming manual sending ID? should return the model number.

author: RCHRDM
author_rank: Regular Contributor
timestamp: January 01, 2017, 04:28:28 pm
content: Thanks very much for the information!I looked again, and it seems that the Keysight Connection Expert does see the spectrum analyzer. I have downloaded the GPIB tools and will try them out.Happy New Year!Richard
Lab power supply overshoot - Page 1
Forum section: electronics / testgear

author: djnz
author_rank: Regular Contributor
timestamp: January 04, 2017, 08:31:39 pm
content: A lab power supply that I acquired recently seems to have a problem. Whatever may the set output voltage be, when its output is enabled, it jumps first to about 0.65V and and then goes to the set value. If the set output voltage is greater than 0.65V, I don't see this as an issue at all, but if the set output voltage is smaller than 0.65V, this becomes a case of overshoot. I have attached an oscilloscope trace photograph taken when the output voltage was set to 0.5V.I was wondering how much of a problem this really is.1. In which cases could this behavior actually be an issue? Which components / circuits could be fried or adversely affected due to this? Would it actually matter if it's fixed or not?2. What could be the reason for this? From the 0.65V value, I suspect there is a PN jn drop involved. How could I go about investigating / fixing this?

author: ZeTeX
author_rank: Frequent Contributor
timestamp: January 04, 2017, 08:37:49 pm
content: It might be just the way the power supply was designed, not a problem, are you using a crappy power supply or a good quality one?other than that, did you notice any instability with various loads?

author: djnz
author_rank: Regular Contributor
timestamp: January 04, 2017, 08:56:49 pm
content: Haven't noticed any instability / other problems yet, though I have only drawn up to 1A from it and it can supply 3A (30V 3A X 2ch, 5V 3A X 1ch). I was actually testing it for assessing its quality. So far, its meter has been pretty accurate and it has stuff like has remote sensing, USB programming (SCPI) so it's definitely not trying the cheapest. It's an ITech supply, also rebadged and sold by BK Precision, so I expect it to be of fairly good quality.

author: ZeTeX
author_rank: Frequent Contributor
timestamp: January 04, 2017, 09:07:31 pm
content: Quote from: djnz on January 04, 2017, 08:56:49 pmTry to add about 10uF capacitor at the output, and put a 0.5A+ load on it and see if the overshoot still happens.
Wall adapter for DER EE DE-5000 LCR meter. - Page 1
Forum section: electronics / testgear

author: shteii01
author_rank: Frequent Contributor
timestamp: December 31, 2016, 06:23:20 pm
content: Anybody has one?What the technical info on it?Plug barrel size?If you could post pic of the technical label, that would be great too.Happy New Year everyone!

author: mstck
author_rank: Contributor
timestamp: December 31, 2016, 08:05:25 pm
content: See attached photo.Barrel diameter is 3.5mmOutput 9V 660mA 6W Max.I hope this helps.

author: shteii01
author_rank: Frequent Contributor
timestamp: December 31, 2016, 09:52:10 pm
content: Quote from: mstck on December 31, 2016, 08:05:25 pmThank you. You are too kind.
Uni Trend UT71D v12 pictures - Page 1
Forum section: electronics / testgear

author: 3nigm4
author_rank: Regular Contributor
timestamp: December 19, 2016, 02:13:15 pm
content: Today the bought UT71D has arived and just the time to test it if power up, and a little teardown to see its iterior.Here are some pictures but seems about the same as previous: glass fuses (enough for my usage)The PCB is marked V20051010-12 71A

author: Mitsch
author_rank: Contributor
timestamp: December 28, 2016, 09:44:25 pm
content: Mine is from 12/2014 and has no glass fuses.. Very odd...https://www.eevblog.com/forum/reviews/uni-t-multimeter-ut71d-unboxing-and-teardown/msg605921/#msg605921

author: mzacharias
author_rank: Frequent Contributor
timestamp: December 28, 2016, 10:45:10 pm
content: As I understand it, Uni-T only supplies the better fuses to those destination countries which require them by regulation.

author: 3nigm4
author_rank: Regular Contributor
timestamp: December 29, 2016, 11:04:48 am
content: Quote from: Mitsch on December 28, 2016, 09:44:25 pmYes, that is odd... from all the versions around, buying an Uni-T remembers me Forrest Gump's sentence: is "like a box of chocolates. You never know what you're gonna get"

author: Hydrawerk
author_rank: Super Contributor
timestamp: December 31, 2016, 01:17:52 am
content: A very poor input protection.

author: 3nigm4
author_rank: Regular Contributor
timestamp: December 31, 2016, 04:44:58 pm
content: Other info to add:- looking at the schema of the meter, the Voltage Reference IC is hooked to the second TI IC under the display and comunicate only to the MCU: that seams that the value compensation is made digitally by the MCU, and not by the ES51966 where its VRef is composed by resistors+cacitors+trimpot;- the True RMS IC used is an AD636/ES636 that specifies that the accuracy is granted to 1kHz: higher frequencies compromise the accuracy; the IC is the same in many other meters where the accuracy for TRMS is granted to 1KHz... so there's no difference between UT71x and others 1kHz, even if Uni-T is reporting 100kHz bandwidth

author: sync
author_rank: Frequent Contributor
timestamp: December 31, 2016, 05:33:59 pm
content: The specs for the UT71 above 1kHz are bad.1-10kHz: 3% + 30 counts10-100kHz: 6% + 30 countsI did an AC voltage frequency response test for a few DMMs. Including my UT-71C. I used an old Russian B1-9 AC calibrator as source. I did only test with 1Vrms (sine wave).freq K2000 34401A UT-71C UT-61E20 0.99963 0.99949 0.9877 0.993650 0.99990 0.99973 0.9961 1.0001100 0.99997 0.99980 0.9975 1.0018200 1.00003 0.99991 0.9978 1.0028500 1.00003 1.00001 0.9982 1.00331k 1.00006 1.00004 1.0003 1.00302k 1.00006 1.00006 1.0043 1.00205k 1.00009 1.00010 1.0089 1.000110k 1.00010 1.00014 0.9962 1.001020k 1.00017 1.00019 0.9811 1.008350k 1.00015 1.00003 0.9826 1.0575100k 0.99993 0.99964 0.9913 1.2083

author: joeqsmith
author_rank: Super Contributor
timestamp: December 31, 2016, 05:45:47 pm
content: Quote from: sync on December 31, 2016, 05:33:59 pmI can believe the UT61E peaking to 1.2 at 100K. I had ran a 1 volt AC sweep of the last 61E I bought before I started to modify it (top graph). It peaked at 150KHz.
Quality problem with the EEVblog BM235 testprobes. - Page 1
Forum section: electronics / testgear

author: Algojervia
author_rank: Unknown
timestamp: December 29, 2016, 02:01:06 am
content: HiI bought the BM235 via the EEVblog homepage about a month ago and it works perfectly but...The tip on one of the probe is somewhat loose and when I screw the banana plug thing on I don't get much tactile feedback at all that it is time to stop turning. As a mater of fact I have already accidentally rotated the tip an unknown number of revolution. The other tip does not behave like this at all and the tip does not rotate even when a moderate force is applied to turn it.I assume that the wire is soldered to the tip and that I sooner or later will break the connection, but it guess it works as long as I keep my mind focused.I guess fixing it might be hard but any ideas are welcome. And has anyone else reported this problem?//AlgoJerViA

author: Vgkid
author_rank: Super Contributor
timestamp: December 29, 2016, 02:35:15 am
content: I think one of my Brymen probes does this as well. They always have so.

author: Algojervia
author_rank: Unknown
timestamp: December 29, 2016, 05:03:35 am
content: I think Dave would gladly replace the probe just to investigate the problem so maybe they should be replaced for that reason. It's just that the local postal service or rather the outsourced remains of a postal service had a hard time keeping track of all the papers involved when a packet arrived from such a strange and exotic country such as Australia, maybe they had a hard time reading australian or something. The thought of repeating that adventure makes me hesitate a bit.

author: Vgkid
author_rank: Super Contributor
timestamp: December 29, 2016, 05:13:08 am
content: I bought mine from Franky about(possibly over) a year ago. For mine, it is the negative(black) probe.

author: Algojervia
author_rank: Unknown
timestamp: December 31, 2016, 04:45:45 pm
content: I bought mine about two months ago directly from Dave but it is the red one, maybe yours and mine are old friends.
Rigol website spects for DP831, DP831A  series error - Page 1
Forum section: electronics / testgear

author: smile
author_rank: Regular Contributor
timestamp: December 30, 2016, 11:06:51 am
content: Hello, I've notices that all Rigol websites have error on their DP831, DP831A.The error is that these are 2Amp models not 5Amp.Here is screenshot attached.I've emailed Rigol multiple times but no reply from them, I wonder how do they communicate when they get your money if this is now.

author: 2N3055
author_rank: Super Contributor
timestamp: December 30, 2016, 03:29:24 pm
content: On a 8V chanel they are 5ADP831 2x30V 2A + 8V 5A

author: smile
author_rank: Regular Contributor
timestamp: December 30, 2016, 05:00:29 pm
content: Quote from: 2N3055 on December 30, 2016, 03:29:24 pmDid not notice that, as the third voltage usually is just extra for the main 2 voltages. Anyway while sorting the PSU's this makes har not to buy the wrong PSU. As I'm sure everyone wants the main 2 voltages to have as much amps as possible.

author: 2N3055
author_rank: Super Contributor
timestamp: December 30, 2016, 08:25:27 pm
content: Depends how you use it..I deliberately bought DP 831 and not DP832, because DP831 has +/- 30V channels with common ground for op amps and other symmetric power buses, and 8V channel is isolated... I use 8V for logic and such, and can have separate analog and digital ground for mixed signal stuff ... I don't use DP831 for high power stuff, have other supplies for that...It's all about right tool for the job, there are no truly universal instruments...Cheers.
Unknown mechanical (measurement?) device identification - Page 1
Forum section: electronics / testgear

author: daqq
author_rank: Super Contributor
timestamp: December 29, 2016, 08:07:57 am
content: Hi guys,This device was posted on a local trading site. I have no idea what it is, nor does the seller, he only listed it as "Measurement device". Any clue? I'm not planing to buy it, it only seemed interesting. There are no markings readable aside from:Vz. 34tov. cis. 2510cis. 645. The 'Vz. 34' is probably "Vzor 34" which would indicate a type, but nothing turns up when this is searched. The 'tov. cis. 2510' is a factory internal number probably and the 'cis. 645' might be a serial number?Any ideas as to the function?Thanks,David

author: tautech
author_rank: Super Contributor
timestamp: December 29, 2016, 08:16:20 am
content: I'd say it was a precision Inclinometer, for measuring the slope of a plane in degrees from level.This pic clearly shows both graduations and what appears to be a Vernier scale to take readings to a fine tolerance.EditDefinitely worth grabbing if it's cheap to ensure you're still on the level. <wink>

author: Jeroen3
author_rank: Super Contributor
timestamp: December 29, 2016, 08:24:46 am
content: Looks a bit like these indeed.https://www.leveldevelopments.com/products/inclinometers/mechanical-inclinometers/83m-mechanical-inclinometer-range-360-degress-accuracy-1-5-magnetic-base/It's not my field at all, but I think you turn the wheel on top until the bubble is centered, then you can read the angle.But how this works with accuracy in minutes, I don't know.

author: ataradov
author_rank: Super Contributor
timestamp: December 29, 2016, 08:24:54 am
content: Well, LT vz. 34 is a tank, so this may be some sort of aiming implement. In which case, it would be a very interesting buy. How much is it?PS: A tank made in Czechoslovakia, so even geographical location is close.

author: daqq
author_rank: Super Contributor
timestamp: December 29, 2016, 03:48:28 pm
content: Thanks guys, that seems to be it.
Vintage used Fluke 45 or some new like GW Instek? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: December 29, 2016, 05:59:57 pm
content: I`m lookin for bench meter like simple Fluke 45 (not rocket sience)Since Fluke 45 is old model and rare in my country I`m gonna try something else - GW Instek. Philips etc.Any Opinions?

author: nctnico
author_rank: Super Contributor
timestamp: December 29, 2016, 06:11:59 pm
content: What kind of accuracy do you need? If 4.5 digits is OK then the Vici VC8145 is worth considering.

author: retrolefty
author_rank: Super Contributor
timestamp: December 29, 2016, 08:24:11 pm
content: I've had my Fluke 45 for a long time now and it still works great and never gives me a problem. Dave did a tare down video on it in the past, might check it out if you haven't yet.
Fluke 8840a VFD - Page 1
Forum section: electronics / testgear

author: mbear2k
author_rank: Regular Contributor
timestamp: December 29, 2016, 01:56:59 am
content: So I took a chance on a clean looking Fluke 8840a that had the AC-09 and the GPIB options. Checked things over, powered it up and no display. Did the power transformer re-flow and went through the manual with a meter and a scope. All voltages and waveforms looked spot on. I did notice my 4.8vac supply to the VFD was at 5v. I read across the connector (J203, pins 1 & 2) going to the VFD board itself - wide open.I then pulled the entire meter apart to get to the display and this is what I found...The front panel looks clean and the unit does not look like it's been opened or worked on.So - anyone have a display assembly they'd like to part with?
ASL F-100 teardown - Page 1
Forum section: electronics / testgear

author: jaromir
author_rank: Unknown
timestamp: December 28, 2016, 09:58:28 am
content: We use those meters -http://www.isotechna.com/F100-Precision-Thermometer-p/f100.htm- at work a lot, while doing some maintenance I couldn't resist to take a look inside before it was sent for recalibration.Unopened, yet. Few screws later, I can see what's insideCable managementAnd some moreThe analog part of main board with nice precise resistor in metal can (metal film type?).There is a few of MAX4575 analog switcheswell, more than a fewAnd the digital oneADS1210, apparently the main ADC chipPIC18F8720 as the brainsDaughterboard with LCD and driver, connected via rainbow cableOh, another shot of ADS1210Looks like quite solid design, no bodge wires, though the wires from connectors to PCB look a bit untidy.
HANTEK 4032L - for use as protocol analyzer - Page 1
Forum section: electronics / testgear

author: bsb0011
author_rank: Contributor
timestamp: December 28, 2016, 04:56:35 am
content: I've seen some posts here where someone was asking about XYZ logic analyzer and someone else would throw in the HANTEK 4032L or some other cheaper Chinese knock off of the Saleae USB logic analyzers. What I have not seen is a review of the HANTEK 4032L for use as a protocol analyzer. I do some hobby level embedded microcontroller design, and use a lot of I2C, 1-wire, SPI, MIDI, DMX-512, PS/2 Keyboard and RS-485 communications. No matter how careful I am, I somehow always seem to screw up the communications and spend WAY to long debugging my projects. Quite often I am trying to connect to other commercial gear that has a serial interface, but no documentation regarding how to interface to the device. I enjoy making things talk together that were never designed to work together.I am not looking for high priced commercial lab equipment, this is for my home lab where I can trade some performance for a lower cost. My budget is around $200 (US) for a useable device. As I have a Tektronix Logic analyzer (an older 1230 with personality modules for most of my favorite old school microcontrollers), I am not looking for a serious workhorse of a LA, but having a handy (and portable) USB LA that happens to also be a protocol analyzer would be a nice touch.So here's what I am looking (asking) about. I want to know how you think the HANTEK 4032L functions as both a logic analyzer and protocol analyzer. What is the good, the bad and the ugly? If you think I am looking in the wrong place for my $200 (US) budget, then what other device do you think I should be looking for, AND WHY?
MDO3000 or MDO4000C oscilloscope  free upgrades? - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: December 23, 2016, 07:11:47 pm
content: Seen this advert pop up hope its of use to some of you?MDO3000 or MDO4000C oscilloscope free upgradeshttp://info.tek.com/en-maximize-your-insight-sales-offer-wc.html?gclid=CN3I76-Bi9ECFde6Gwod6jgJZw

author: Someone
author_rank: Super Contributor
timestamp: December 23, 2016, 10:01:29 pm
content: Its not a free upgrade, its a sales promotion for a free option when ordering a new product. Nothing exciting here.
HP E4400 Series Spectrum analyzers - Any hackers? - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: November 12, 2016, 04:05:01 pm
content: Has anyone worked with the HP E Series (Like the E4401B) in terms of enabling personality options? I believe these are out of support and considered obsolete.SamW3OHM

author: vooltool
author_rank: Newbie
timestamp: December 28, 2016, 11:52:06 am
content: I am looking for same - may be somebody did hack of this ESA E44xxb analyzers?
Rigol DG4000: issue with output level of modulated signal - Page 1
Forum section: electronics / testgear

author: madires
author_rank: Super Contributor
timestamp: December 21, 2016, 01:54:06 pm
content: If you're looking for a signal generator for RF stuff the following might be interesting to avoid buying the wrong tool:

author: Radio Tech
author_rank: Frequent Contributor
timestamp: December 21, 2016, 11:36:05 pm
content: I agree. Mike was pretty unhappy with it. It has and does all the functions But that output issue was strange.

author: Orange
author_rank: Frequent Contributor
timestamp: December 23, 2016, 10:38:57 am
content: My Rigol DG4102 does the same on AM modulation !My Siglent SDG1062X does the same on AM modulation !On my HP8657B I don't have this issue, but that is a real RF signal generator.Moral of this story : Know your Test Equipment limitations

author: Marc M.
author_rank: Regular Contributor
timestamp: December 24, 2016, 02:52:37 pm
content: Having done a 3+ year stint as a bench tech back in the heyday of CB, I have a lot of respect for Mike and his work. That said, I found it a little odd that he would purchase a function gen. to use as an RF generator. It certainly shouldn't have the kind of error it does (which Rigol seems to be calling a feature), but I also wouldn't expect it to be a suitable replacement for an RF generator. There's a reason RF generators are $$$$$$ and function generators are $$. Because of his unrealistic expectations, I feel his harsh criticism is a little unfair to Rigol.
Can cmu200 be used as frenquncy analyser? - Page 1
Forum section: electronics / testgear

author: a7458969
author_rank: Newbie
timestamp: December 22, 2016, 02:34:34 pm
content: So many cmu200 be eliminated and we can buy it in a inexpensive price.But how's the performance of it to being a frequency analyser like RBW.VBW or frenquency accuracy?anyone have tested it ?

author: Brainbox
author_rank: Contributor
timestamp: December 23, 2016, 08:56:37 am
content: Hi.The CMU can be used as a excellent Spectrumanalyser.The RBW can be set from 10 Hz to 1MHz and the frequency resolution has a minimum of 0.1 Hz.Depending on the options, the frequency stability is 1x10-6/Y(standard), 1x10-7/Y (Option B11), or 1x10-9/Y (Option B12)VBW is not specified but you can choice between 3 sensivity levels.It also has avery accurate generators form 100 KHz to 2700 MHz. and several reference outputs.Some of them have the audio option B41 for analyzing and generating dual AF signals.It has no tracking generator, but you can use a software solution on a PC or buy a third party TG.However, keep in mind that it is meant as a test station for handy s and so it has o lot of functions you will never use.That makes it more difficult to learn understanding the unit.
Hybrid Combiners and IP3 measurement -DIY experience - Page 1
Forum section: electronics / testgear

author: bozidarms
author_rank: Regular Contributor
timestamp: December 22, 2016, 12:12:41 am
content: Hi to the groupThere are shown some IP3 measurements with diy combiner (1-30 MHz).There is over 70 dBm IMD free dynamic range in wide band (50 kHz)and even over 80 dBm in narow band (3 kHz) spacing.50 ohm terminated combiner have over 45 dBm port to port isolation.For one Manhattan style, open combiner and raw measurementsgenerator - combiner - analyzer, results are pretty nice.What are your experiences about such diy combiners and similar measurements?