hybridfree/eevblog-posts huggingface dataset:
Specs of Tek 2445B? - Page 1
Forum section: electronics / testgear

author: Mr Simpleton
author_rank: Unknown
timestamp: October 14, 2014, 10:29:28 am
content: Been lurking around Tektronix 2445/65 for a while, lusting to have one in my lab...I noticed that the 2445B seems to be either 150 or 200 MHz??Comparing with its bigger brother 2465A/B this clearly indicates 350 and 400 MHz.Were there two versions of the 2445B??Except for the BW is there any other reason to pick the 2465 vs 45?Some sells these with white CRT, is it possible to convert to more "normal" blue-ish colour?

author: w2aew
author_rank: Super Contributor
timestamp: October 14, 2014, 01:55:50 pm
content: The 2445B was introduced as a 150MHz scope (in 1989 I believe). In the 1993 catalog, it was shown as a 200MHz scope. I don't know if there is a serial number break where the change was made. The "white" CRT just means that someone removed the blue CRT filter from face. This can be replaced.

author: nanofrog
author_rank: Super Contributor
timestamp: October 14, 2014, 09:32:30 pm
content: I always thought it went:2445 & 2445A (150MHz)2445B (200MHz), but no serial number split on the B models before the increased BW was added.

author: w2aew
author_rank: Super Contributor
timestamp: October 15, 2014, 12:23:37 am
content: Quote from: nanofrog on October 14, 2014, 09:32:30 pmThe B first appears in the '89 catalog as 150MHz. It isn't shown as 200MHz until the 91 catalog where it's listed as 200MHz for +15 to +35C operation (150MHz for -15 to +15 and 35 to 55C). I have a 2445B that shows 150MHz on the front panel.

author: nanofrog
author_rank: Super Contributor
timestamp: October 15, 2014, 12:35:49 am
content: Quote from: w2aew on October 15, 2014, 12:23:37 amThanks.Didn't know that.Front panel label on mine states 200MHz, and don't recall seeing a B model @ 150MHz.
RIGOL Scope probes - Page 1
Forum section: electronics / testgear

author: jlmoon
author_rank: Unknown
timestamp: October 14, 2014, 08:15:39 pm
content: Hello,Anybody had bad experience with the factory supplied scope probes that come with the DS series scopes. I find the ezhook clip hood isn't of great quality, I have a problem with the hook turning slightly when trying to clip on a pin or test point preventing the hook from making good firm contact. Personally they stink!Does anyone have a suggestion for a good set of replacement probes that will stay within the spec guidelines of the scope. I have the DS2202 model.Thanks,JLM
Teardown : HP 54006A: 6 GHz passive probe - Page 1
Forum section: electronics / testgear

author: free_electron
author_rank: Super Contributor
timestamp: October 19, 2014, 07:09:20 pm
content: HP54006 high frequency probe. Picked for 10$ at the de-anza fleamarket. Seller didnt know much about it since he claimed only the cable and accesories were there but no probe. (free_electron puts pinky in mouth ala dr-evil and goes 'riiiiight' ...)Both , yes BOTH probes are in fact there. they just don't look like what you'd expect !http://www.siliconvalleygarage.com/eevblog/54006a/54006box.jpgCame even in the original box.http://www.siliconvalleygarage.com/eevblog/54006a/54006kit.jpgcontents : SMA kabel , SMA-BNC adapter, DC blocking cap , Two probe tips (1:10 en 1:20) and spare probe tip resistors)http://www.siliconvalleygarage.com/eevblog/54006a/54006blocktip.jpgThe blocking cap does 26 GHz ... That thing alone cost a fortune. almost 1000$ new ...the probes are essentially a small SMA connector that goes to two pins one is ground the other the attenuator tip. the attenuator tip is nothing else but the wire from a caddock resistor with gold plating on it. Depending on the attenuation the resistor is either 450 ohm or 950 ohm. the 50 ohm termination th eprobe needs is made inside the scope.http://www.siliconvalleygarage.com/eevblog/54006a/54006caddock.jpgThe resistors are made by Caddockhttp://www.siliconvalleygarage.com/eevblog/54006a/54006resistor.jpgTo swap one simply unscrew the protective barrel and pop it out. they slide in.the specific series is sold by caddock but the resistance values here are not in the standard list. those are Agilent only ..This probe is still being sold at close to 3000 dollar .. at 10$ ... i'll take that !

author: vaualbus
author_rank: Frequent Contributor
timestamp: October 19, 2014, 07:24:31 pm
content: You have got a lot of lucky.The person really havent look rf stuff!

author: kg4arn
author_rank: Unknown
timestamp: October 19, 2014, 07:28:11 pm
content: Wow! Not exactly what you find at flea markets where I live.

author: SeanB
author_rank: Super Contributor
timestamp: October 19, 2014, 07:39:04 pm
content: Good find Vincent. Glad to see you are still getting stuff there at prices that make a fire sale look expensive.

author: German_EE
author_rank: Super Contributor
timestamp: October 19, 2014, 07:56:36 pm
content: It is finds like that which make flea markets so much fun

author: SeanB
author_rank: Super Contributor
timestamp: October 19, 2014, 08:04:45 pm
content: Last time I went ( beginning of month) there was mostly junk ( well, that would be a good improvement on some of it, which would have been better described as "missed the landfill collection") but I did pick up a lamp ( and a 2p coin stuck onto it) just for the base, a spirit level and 30 leather belt tool holders. Sold 12 of the tool holders there so got half my money back in minutes. total cost was $10 for the lot.
Re:Load Pro Video review and teardown - Page 1
Forum section: electronics / testgear

author: papo
author_rank: Regular Contributor
timestamp: October 14, 2014, 11:24:07 am
content: HelloI backed the kickstarter campaign for this device, recently got mine and had a good look at it.. Also, somebody on the IRC channel asked for a picture of the bottom side of the PCB. I attached it to this post. Summary: It's cool. I'm posting this here because I think the unit might be interesting to some of us who don't want to shell out a lot of money for a beefier commercial load, yet want something a bit more rugged and tested than the crude opamp & FET on a perfboard approach.RegardsMatt

author: deephaven
author_rank: Frequent Contributor
timestamp: October 14, 2014, 03:34:04 pm
content: Nice review and teardown.Thanks for taking the time to do this.
Interchangeability of Waveform file format between Rigol and Siglent - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: October 09, 2014, 07:52:29 pm
content: Hello,I wanted to check here about the interchangeability of Waveform file format between Rigol scope and Siglent function generator.More in particular I wanted to check if it would be possible to capture waveform with Rigol DS1000Z/DS2000 series oscilloscope, and then later on use the captured waveform as arbitrary waveform on the Siglent SDG1020 function generator.Probably this is not possible, and that's a pity, as it looks like SDG1020 from Siglent is a better deal than DG1022/A from Rigol currently.Is it a correct understanding that SDG1020 from Siglent is currently best deal for function generator? Rigol DG1000 series has less memory depth and resolution, and the DG1000Z series is much more expensive.If the Waveform file format is not compatible as such, would there exist conversion tools, or would this be easy to write yourself?

author: biot
author_rank: Regular Contributor
timestamp: October 09, 2014, 11:49:17 pm
content: Quote from: pascal_sweden on October 09, 2014, 07:52:29 pmI'm not familiar with the format the Siglent expects, but I think you can safely assume it's not going to be compatible in any way with what Rigol puts out.Converting between file formats like this, and indeed captured waveforms and file formats, is one of the things we're doing in thesigrokproject. We have a modular system for hardware (including Rigol scopes), and input/output formats. No support for function generators yet, but writing an output module for the Siglent AWG format should be pretty easy.You can help make it happen by writing that module, or, if you're not into C programming, documenting the file format for our wiki.

author: marmad
author_rank: Super Contributor
timestamp: October 14, 2014, 01:18:25 pm
content: Quote from: pascal_sweden on October 09, 2014, 07:52:29 pmI don't know what file formats the Siglent accepts, but I imagine it will take a .CSV format of one type or another - and the Rigol can write .CSV files of the waveform - so it would be a trivial matter to make a converter (it could likely be done in Excel).
Did I brick my Hantek Oscilloscope just 2 days after purchasing? - Page 1
Forum section: electronics / testgear

author: btesser
author_rank: Newbie
timestamp: October 14, 2014, 03:06:40 am
content: I recently got a dso5072P which I ordered off ebay. Attempted to do the hack and I soldered 4 posts to the uart port (the one right next to the usb port). The posts were a tiny bit large so I had to force them in a bit (they are about arduino sized pins). When I tried to power the dso back on, however, I got absolutely nothing showing up on the display or uart. I disconnected everything, desoldered the pins, pulled the posts out.pulled out a multimeter. When I checked ground/power on the uart pins, my multimeter showed a very low resistance I believe 64ohms(my reading of the multimeter may be wrong. With multimeter set to resistance 200 it showed 64 on the sy creen). I made sure I really cleaned the board of solder well where I had added the pins using a solder sucker and solder wick. No matter what I do I'm getting the same reading on my multimeter. Is it possible I bricked one of the inner layers of the board by forcing the pin in? I tried putting the positive multimeter probe on the uart positive and the negative probe on grounds in different areas of the board and got the same reading. Uart ground to other grounds reads 0.Does anyone have any ideas? Right now I'm bugging out a bit because if I bricked my dso I just threw about $300 down the drain :-(Please help

author: Fungus
author_rank: Super Contributor
timestamp: October 14, 2014, 06:53:45 am
content: Quote from: btesser on October 14, 2014, 03:06:40 amThat reading means nothing. There will be capacitors from Vcc to GND, you're seeing those.Much more important: How many volts does it read when you power it on?
Do you have a Prema 6048/6047?  - Page 1
Forum section: electronics / testgear

author: matt09
author_rank: Regular Contributor
timestamp: October 13, 2014, 09:04:20 pm
content: I recently acquired a Prema 6048 integrating meter which was chucked out at work. As far as I can tell everything seems to be working except the current measurement. Despite the intact fuse I the input seems to be open circuit when I should be seeing the shunt. I’ve found the manual quite confusing and aren’t totally confident that I am actually getting the device into current mode however so I’m not sure if it’s a case of button wear / faulty control stopping the relays actuating / me not pressing the right button combinations.Basically I’m trying to find out the *correct* behaviour to put the device into current measuring more for DC and AC which I can only do for sure by comparing it to a working device.I believe the following should work for DC current mode:Press 2000mA buttonPress Ratio 2nd buttonPress mAdc buttonIn my case nothing happens in doing this unless I hold the Ratio 2nd button, then the display changes to what might be current measuring mode with the Ratio 2nd button lighting up.I can’t get the Radio 2nd button to light up AND the mAac buttons to both light up simultaneously at all so this leads me to believe the control system might not be working properly but without a reference device I don’t know for sure..If anyone with a 6047/6048 could tell me the exact stages and lights that come on for measuring DC and AC current for your device it would be hugely appreciated!

author: wiss
author_rank: Frequent Contributor
timestamp: October 13, 2014, 10:26:31 pm
content: Shouldn't you press TEMP/2nd ?
Pretty large difference spot meassurement between Flir i7 and E4 - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: October 13, 2014, 08:41:21 pm
content: I have performed some simple tests comparing the readings of Flir i7 and E4 cameras using center spot measurement.Brightness and emisivity settings are set in both cameras to 0.95 and 20C.The measurements I get on i7 give always readings that are 2C above E4. I have tried over different distances and surfaces.Can this offset be normal or I am missing something here ?P.S. I know the accuracy of these cameras is rather poor (about 2C according to E4 specifications). But I am wondering why there are such differences bewteen both cameras.
BK Precision PR28 High Voltage Probe - Page 1
Forum section: electronics / testgear

author: dorkshoei
author_rank: Frequent Contributor
timestamp: October 13, 2014, 06:24:55 pm
content: Does anyone have one of these? The original BR28, not the PR28A.Basically this:http://www.test-and-measurement.net/bk-pr28.htmI came to use mine today for first time in probably 10 years and I found a note inside the storage box saying that it had stopped working which reminded me that it had.I remembered it just stopped working while I was using it and I recalled taking it apart at the time I wrote that note but couldn't recall what I discovered.Anyhow I just took it apart again and put it back together and now it's "working" but I'm reading 19Kv rather than the spec'd 21Kv. I need to borrow another probe to check calibration.My question.Has anyone ever taken theirs apart?Inside there is a HV resistor (600Mohm) and also a spring. I expect this is what the manual refers to as "spring, resistor 767-037-9-001". On one end of the resistor is a screw+washer and the other end nothing. The spring isn't attached to the resistor in any way, at least not on mine. The spring is conical and has a small nut and star washer pressed onto the end.I'm not 100% sure what the correct orientation is. I think it's as shown but I wasn't sure if anyone knew for sure? The zoomed in picture is the interior of the plastic probe tip, where the spring makes contact.I called BK, a) it's too old b) they don't give info out on questions like this
Hantek DSO5072P scope; missing RS232 port - Page 1
Forum section: electronics / testgear

author: oneeye
author_rank: Newbie
timestamp: September 21, 2014, 05:09:38 pm
content: Hi allI just got me a new Hantek DSO5072P scope, first because it was the cheapest (most expensive I could afford), and second, because I liked the idea of 'hacking' it up to 200MHz.Took the covers off and was I disappointed. NO RS232 PORT. If this has been reported already, I apologize, but I did several searches and turned up zilch.If anyone is interested, I took some pictures:Not sure if I put them in correctly because they don't show in preview, so I added them as attachments as well. But they don't show up 'preview' either.If Hantek hid the port somewhere and anyone knows where, I would be a very happy bunny if you could let me know where, or if there is another way of performing 'Tinhead's' excellent hacks.I didn't look under the small shields next to where the port was originally, I guess I'm hoping that's where it's hiding.UPDATE: I think I'm beginning to see the light (dimly), from working my way slowly through Tinhead's 600 pages, (how does the guy do it?) Consequently, I now believe the 'hack port' was moved back to next to the rear USB (B). If this is correct, could somebody let me know! I'm reluctant to ask Tinhead, the guy has his hands full with more than enough pratts like me asking silly questions all the time.Any help or info would be much appreciated.oneeye

author: The Doc
author_rank: Contributor
timestamp: September 25, 2014, 06:23:15 pm
content: Correct... it is immediately to the left of the USB port as you view the board from the rear, and the pins are (from left to right) +3.3V GND TX RX

author: tinhead
author_rank: Super Contributor
timestamp: September 25, 2014, 06:59:27 pm
content: checkhttps://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg505545/#msg505545

author: oneeye
author_rank: Newbie
timestamp: October 13, 2014, 03:33:47 pm
content: Thank you The Doc and Tinhead.Yes I have already discovered that while reading through your (Tinhead) gargantuan work, but now I have a new problem.My problem is that the voltages are all reading wrong (see attached screen shot).I have been searching (nothing relevant) and reading (nothing found).I have done no 'Hacks' or software or firmware upgrades and the scope was working fine until today.The only thing I have done, is to download a 'backup' using Tinheads excellent software via the front USB, hence the 'upgrade count' of one.The 'backup' was done when first got the scope and it has worked OK until now. As I don't know if it's a software or hardware problem, I haven't attempted to 'reinstall' the 'backup', for fear of making things worse.Any help or suggestions would be greatly appreciated.oneeye
HP/Agilent/Keysight 6643A - part number enquiry and advice - Page 1
Forum section: electronics / testgear

author: simingx
author_rank: Contributor
timestamp: October 14, 2014, 03:29:00 pm
content: Hi,Just "repaired" a faulty 6643A... no display caused by a faulty GPIB board. Couldn't care less about computer control, so just bypassed it as per the service manual, and I got a nice PSU for next to nothingIt's early 2000 manufacture though, would it be advisable to replace the large electrolytics? It looks like it's had some use... the inside is full of dust.Anyone can confirm if the part number for the clear plastic over the LCD is part number 1000-0842?Also, what's 5188-4212? It's listed as a daughterboard, but I can't find it in the parts list... perhaps the binding post board?Thanks!
Uni-t UT136B questions - Page 1
Forum section: electronics / testgear

author: UberStrike88
author_rank: Regular Contributor
timestamp: October 12, 2014, 08:45:00 am
content: Hello guys,I would like to ask some questions about this multimeter .Well i would like to know if it autoranges fast and gives good readings. and if it has all the functionality that you needBecause i'm going to use this as my main multimeter for 1 month unil i'll buy a UT61X(anyone knows the differences between A,B,C,D,E?)Thanks for readingRegards,

author: Lightages
author_rank: Unknown
timestamp: October 12, 2014, 02:25:03 pm
content: I already told you about the model differences in a PM, so why ask here again?A, simple model, B has capacitance, C has temperature, and D has a non contact voltage detector.It is reasonably fast as you can see in my video. This is a $20 class multimeter and you can't expect to get picky about performance. It works, not badly built, and is cheap. What else do you really need to know after watching my review video?

author: UberStrike88
author_rank: Regular Contributor
timestamp: October 12, 2014, 02:41:33 pm
content: I thought that the ut61 series have different thing for that thats why i asked

author: CrashO
author_rank: Unknown
timestamp: October 12, 2014, 03:18:11 pm
content: I agree with Lightages. The meter is a good deal for the price its at. (under $17,- delivered)But it is still a $20 class meter, so don't expect it to be the duck's guts. But for general use as a second of third meter, rock on.

author: Lightages
author_rank: Unknown
timestamp: October 12, 2014, 11:45:48 pm
content: Quote from: UberStrike88 on October 12, 2014, 02:41:33 pmMy apologies. I misread your question. If you are asking about the differences in the UT61 series, the biggest difference is that all the ones that are not the UT61E are not worth the money IMHO. In the same price range, I think I would rather have the new UT139C. It is built more safely, has a back light, non-contact voltage detector, temperature and seems to be the better buy to me. If you need the PC logging feature well then the the UT61E might be better.

author: UberStrike88
author_rank: Regular Contributor
timestamp: October 13, 2014, 06:52:53 am
content: Okay guys thank you for the help!I ordered the UT136Bo i'll save up and get the UT139C or the UT61E
keithley 2000 release date? - Page 1
Forum section: electronics / testgear

author: Lizerd
author_rank: Contributor
timestamp: October 10, 2014, 08:17:23 pm
content: Hi all.I was just about to buy a keithley 2000. but when I asked about the calibration date,is was DATE 09/13/95 , NDUE 09/13/96.I did try to find out when the keithley 2000 was released without any luck.Did the version actually exist 1995?Or have something happen to it ?I am trying to find a good 6.5 digit model that is good and fast on low current applications.Any recommendations ?

author: KJDS
author_rank: Super Contributor
timestamp: October 10, 2014, 08:39:29 pm
content: I do know that the Keithley 2015THD isn't great for low current, some tests here

author: Andreas
author_rank: Super Contributor
timestamp: October 10, 2014, 08:48:00 pm
content: Hello,the german handbook is copyrighted 1995.With best regardsAndreas

author: timb
author_rank: Super Contributor
timestamp: October 12, 2014, 11:40:51 pm
content: I just bought one on eBay that has parts with a 1995 date code inside. So it was for sure released then!In my tests, the 2000 is pretty good at lower current measurements. If you want better you'll be paying thousands for a more recent picoammeter.Sent from my Smartphone
Can the Rigol 4000 series be moded like the DS2072? - Page 1
Forum section: electronics / testgear

author: dewey
author_rank: Newbie
timestamp: October 12, 2014, 09:46:05 am
content: HiCan the Rigol 4000 series be "firmware modified" like the DS2072 can? I find I really like the 2072 a lot, but I wish I had 4 channels, since I plan on doing 3 phase motor driver work. I'm guessing the DS4014 would be the scope to use if I wanted the low end of the 4-channel Rigol line. Can that unit be tricked into thinking it's a DS4054?-Thanks

author: dr.diesel
author_rank: Super Contributor
timestamp: October 12, 2014, 02:27:47 pm
content: Yes it can, plenty of info in the Rigol i2c bus thread.
U1253A, resistance, shorted test leads - you'd expect a reading of...? - Page 1
Forum section: electronics / testgear

author: cantanko
author_rank: Newbie
timestamp: October 10, 2014, 08:14:00 pm
content: Hello - long-time lurker, first time poster here...I've just picked up pre-loved Agilent U1253A multimeter for just over a hundred quid and, surprisingly, it came with a brand new cal certificate from what I consider to be a reputable test house (they shall remain nameless for the time being to protect the innocent / guilty!).I've been playing around with this thing and, when in resistance mode and shorting the supplied test leads, I get a reading of -0.04?... Now forgive my rubbish physics, but this sounds a little strange...My 87V, with the same leads, gives a (far more plausible) reading of 0.10? - I'm assuming this probably means the cal cert is worth naff all?Any opinions welcomeCheers,Harry

author: Lightages
author_rank: Unknown
timestamp: October 10, 2014, 09:43:59 pm
content: You have discovered the source of dark energy!No seriously, the calibration is off IMHO.

author: cantanko
author_rank: Newbie
timestamp: October 10, 2014, 09:51:36 pm
content: Yeah - figured as much... Incidentally that was supposed to be a unicode ohm symbol after the readings - seems the act of posting just made me look like I'm a fan of the interrogative

author: ModemHead
author_rank: Frequent Contributor
timestamp: October 10, 2014, 10:54:58 pm
content: I doubt it's anything to worry about. I have a Fluke 289 here that will read -0.011 in low ohms mode with a shorting plug on the jacks. Right or wrong, I always attributed it to software calibration (stored offsets). Tens of milli-ohms is down in the noise for a handheld DMM using 2-wire method with low current, and you're probably going be using relative mode here anyway.

author: Wytnucls
author_rank: Super Contributor
timestamp: October 11, 2014, 12:35:01 am
content: The meter should be reading the test leads resistance, so it is out by a significant amount. I would send it back to the calibration house, if at all possible. If they screwed that one, what else is possibly out of specs?

author: toli
author_rank: Frequent Contributor
timestamp: October 11, 2014, 06:36:35 am
content: I'm not sure I understand the problem here. The manual for the U1253A states for the 500R range "0.05% + 10 counts". So the 10 counts alone are 0.1ohm for that range - meaning it can be as high as 0.14R while you read 0.04R on the screen. So even if its 0.1R as the Fluke says (and who knows if its really that accurate), its still within spec.

author: Wytnucls
author_rank: Super Contributor
timestamp: October 11, 2014, 07:33:04 am
content: To be right on the limits of the 1-year accuracy specs, the test leads resistance should be 0.06 Ohm or less. Possible, but unlikely.

author: Neilm
author_rank: Super Contributor
timestamp: October 11, 2014, 06:08:34 pm
content: Just check that this isn't one of those meters that allow you to null out the test leads, then helpfully keep nulling after you turn it off and on again. I have seen some like that and it is a pain until you figure it out.
HP/Agilent/Keysight 8156A burning fuses. Service Manual anyone? - Page 1
Forum section: electronics / testgear

author: jopki
author_rank: Newbie
timestamp: October 11, 2014, 04:05:00 pm
content: Hello,My obsolete Agilent 8156A Optical Attenuator burned internal fuse the other day out of the blue, while in operation for 2 hrs and since then, keeps doing so. I am suspecting the problem is in the PS. Before I try to rev-eng / repair it, I just wondered if anyone has seen a 8156A service manual - I was not able to locate it anywhere.Thanks, Jiri
She's alive!!! The TDS460 works!!! - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: October 09, 2014, 11:43:12 pm
content: Picked up a TDS460 locally for dirt cheap.Failed the typical acquisition stuff due to the typical leaking caps.Replaced all the caps and she runs!Now to RTFM since I don't use DSO's too much.I'm thinking it should compliment my 2246a fairly well since about all I do on the side at home is vintage stereo repair.

author: radhaz
author_rank: Regular Contributor
timestamp: October 10, 2014, 04:04:35 am
content: Looks like a nice score.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 10, 2014, 05:50:23 am
content: Nice!I bought mine online, working for an average price; took about six months before I had to recap. Found every one of the bastards, works fine now.Now if only the slow menus could be "recapped"...Tim

author: Richard Head
author_rank: Frequent Contributor
timestamp: October 10, 2014, 06:25:49 am
content: I've got a TDS480 and the time between sweeps when the menus are displayed is really slow.So far no cap problems but I suppose it's just a matter of time.I really drool when I see the fancy Agilent scopes that Dave shows from time to time.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 10, 2014, 08:10:22 pm
content: What's sad is the contemporary 546xx series HP/Agilent scopes have always had real time menus. The acquisition and measurement is still top notch at least.Tim
Schematic for Power Designs 2020 Precision Power Supply - Page 1
Forum section: electronics / testgear

author: motocoder
author_rank: Unknown
timestamp: October 10, 2014, 06:10:54 am
content: I posted this over in the Repair forum, but thought I better cross post it here as well.Does anyone have a manual/schematic for the Power Designs 2020 Precision Power supply? I have the manual for the 2020B, but this unit is labeled 2020, not 2020B.
Data Precision 2590 5.5 Digit Multimeter - Page 1
Forum section: electronics / testgear

author: VintageTekFan
author_rank: Regular Contributor
timestamp: October 10, 2014, 02:11:06 pm
content: I just picked up a Data Precision 2590 5.5 Digit Multimeter from a local tech recycler for 10 bucks.Trying to find some information on it, but I Google fails me. Would love a spec sheet, or a manual, or best a service manual.So far, I only checked it on the 20V range, and it reads reasonably, and shorting the inputs produces 0.00000. The mA range does not appear to work, but there is a blown 2A fuse in the back, and I think its also the current source for the mA reading - so I'm hoping replacing the fuse will work - thats tonight's project.I may do a tear-down with pictures if its not too bad, and I can find my camera.

author: MarkPalmer
author_rank: Regular Contributor
timestamp: October 10, 2014, 07:42:01 pm
content: Data Precision's meters were well made and were competitive with most other high end DMM's of their time. I had one of the older 5.5 digit ones years back, it might have been a 3500 model. It had Panaplex displays and auto-ranging accomplished by clicking through a row of about 8 relays. Unfortunately it stopped working, and I would have just as soon found diamonds digging in my back yard before I could find any service data for it. Some of these smaller American T/M companies of the past sold the majority of what they built to the government and their management was hesitant over releasing service data in an open manner. As the production quantities of the equipment itself were relatively small, it makes finding service info even harder.-Mark-
Agilent N8900A infiniiview hack? - Page 1
Forum section: electronics / testgear

author: bitrat
author_rank: Newbie
timestamp: October 10, 2014, 04:25:35 pm
content: http://www.keysight.com/en/pd-2113078-pn-N8900A/infiniiview-oscilloscope-analysis-softwareI know it's not an “Oscilloscope”...But the offline-analyse ability looks attractive, while the license shares a similar structure with other agilent products.Has any guys made any progress with hacking it?
Flir E4 TiConfig ; Backup fails on 400 files! - Page 1
Forum section: electronics / testgear

author: luis garcia
author_rank: Regular Contributor
timestamp: October 10, 2014, 03:46:18 pm
content: Hi.I have tried to 'full backup' my Flir E4, prior to apply the 'upgrade'. The backup process takes some time and then it tells me 400 files have been unable to be copied, probably because they were in use.May I consider the backup has been succesful or not ? :-/ If not, what can I do to achieve a successful backup ?By the way, do I need to turn ON the E4 to be detected by TiConfig or is it enough to plug it on the USB ? (i had to turn it on to be detected by TiConfig).If I use Filezilla to backup the files using FTP I can save 200 files; the transfer fails on 17 files.How do I know I am performing a true full backup ?Luis.
SOLVED Logic Probe for Tenma 72-5075 - Page 1
Forum section: electronics / testgear

author: tekochip
author_rank: Newbie
timestamp: September 18, 2014, 03:03:32 am
content: I have it all working!The mating part is a 3M 05111173839, although there are other parts in the family that will mate to it. The pinout is:1:5V 2:Gnd3:5V 4:In55:In4 6:Gnd7:Gnd 8:In69:In3 10:Gnd11:Gnd 12:In713:In2 14:Gnd15:Gnd 16:In817:In1 18:5V19:Gnd 20:5VThe inputs are 5V logic only at a fairly low impedance, so you will need some sort of buffer. I built a board with a 3V and 1.8V regulator, along with a pair of `07 buffers. The board is designed to fit into a little tea tin, sort of like an Altoid's box, with a switch to go from 1.8V - 3V, and a connector that fits the Logic Saleae probe set because those are cheap and easy to get. Plus, I have spares.If anyone is interested I can post a schematic and I have spare parts as well.

author: JoeO
author_rank: Frequent Contributor
timestamp: September 18, 2014, 11:30:43 am
content: If you have done all this work, then yes, post it here.Also if you want to get rid of your spare parts, turn on your location flag so we will know where in the world you are.

author: tekochip
author_rank: Newbie
timestamp: September 18, 2014, 12:05:22 pm
content: OK, here's the schematic and a pair of Eagle files. Certainly, there are other ways to buffer the probe, but this will get the job done.

author: BONGOJERE
author_rank: Newbie
timestamp: October 09, 2014, 12:25:05 pm
content: TC,I can't figure out how to post a question. Can you enlighten me?Thanks,J
YTO Reliability - Page 1
Forum section: electronics / testgear

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: October 08, 2014, 07:23:57 pm
content: Hi,I think I have a bad YIG tuned Oscillator in a 20 Gig Freq. Synth. Anyone know the reliability of these electro-mechanical devices?Seems they run in an 85C oven environment, with the YIG somehow attached to a small rod, and tuning done with at least one magnetic coil with around 200-400 mA running through it. The chances for failure seem awfully high with all this going on...

author: MadTux
author_rank: Frequent Contributor
timestamp: October 08, 2014, 09:23:42 pm
content: Get some inspiration there:http://www.qsl.net/ct1dmk/wbond_ex.htmlBTW: Nothing electromechanical, if it becomes electromechanical, the YIG spere or the rod on which it sits, is loose and you'll have a fun time adjusting it back into position.So unless you dropped it, it should be fine. Do you have test gear (SA or power meter) that goes to 20GHz for troubleshooting?

author: nouserid
author_rank: Contributor
timestamp: October 08, 2014, 09:34:59 pm
content: I find the Avantek YTOs to be quite reliable throughout the years of service. Some HP ones are not hermetically sealed and they might degrade with time, depending on the environment.

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: October 08, 2014, 09:47:35 pm
content: Quote from: MadTux on October 08, 2014, 09:23:42 pmAccess to measurement equipment for 20, or so Gigs, yes.Must be a lot of people dropping them out there...http://vidaproducts.com/pdf/News_Affordable_YIG_Repair_And_Replacement.pdf
KEITHLEY 181 Mv connector - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: October 10, 2014, 12:25:35 pm
content: I just scored a KEITHLEY 181I will be able to "voltnuting" againNow I'm looking where I can find this special connector, I check on ebay

author: SeanB
author_rank: Super Contributor
timestamp: October 11, 2014, 08:15:38 am
content: Post one of them uncoupled, so we can see the internal construction and pinout orientation.At present all you can look for is circular locking connector.

author: eurofox
author_rank: Unknown
timestamp: October 11, 2014, 08:21:11 am
content: Quote from: SeanB on October 11, 2014, 08:15:38 am

author: SeanB
author_rank: Super Contributor
timestamp: October 11, 2014, 08:33:03 am
content: Expensive connectors, and you order as kits of parts....http://docs-europe.electrocomponents.com/webdocs/11c0/0900766b811c0600.pdfbut they are pretty rugged and really good at their job.

author: eurofox
author_rank: Unknown
timestamp: October 11, 2014, 08:49:24 am
content: Quote from: SeanB on October 11, 2014, 08:33:03 amI have use this brand in industrial rack in the past.I checked as well the original connector from the keithley spare part list and cost about $500 in the US and I'm not willing to pay that.In the worst case I will replace the connector with 2 high quality binding post with copper/beryllium.
BK 2120 Oscilloscope - Need Help - Page 1
Forum section: electronics / testgear

author: jeffnet
author_rank: Newbie
timestamp: September 04, 2013, 09:49:14 pm
content: So I have this old analog Oscilloscope and it has some problems. It has a small trace and is offset. I looked inside and most of it looks good but I noticed a burned resistor. Color code burned off and I have no service manual. I don't know if this is the problem as I haven't fully disassembled it yet. I tried looking for a service manual online but could not find one for the 2120. I found one for the 2120A but It appears to be very different.So I have decided to ask you guys as you all seem to be a smart bunch.This is it powered on with nothing connected.This is it connected to a 16MHz Crystal.Does anyone have a service manual for this?

author: mtdoc
author_rank: Super Contributor
timestamp: September 04, 2013, 10:05:18 pm
content: You should request a copy of a manual from their websiteHEREI recently picked up a BK 1541c scope at a thrift store on the cheap- so I requested a manual from their website. They sent me a PDF file a few days after my requestOn looking I see that they already have the 2120 manual onlineHERE- but no circuit diagram or schematic in it- -- so maybe try requesting a service manual or schematic

author: jeffnet
author_rank: Newbie
timestamp: September 05, 2013, 06:45:56 am
content: OK I just sent in a request for a schematic. Hopefully they will respond.

author: austinhmfic
author_rank: Newbie
timestamp: October 08, 2014, 07:11:09 am
content: BK 2120 Service Manual with schematics and part list can be found athttp://elektrotanya.com/b_k_2120_oscilloscope_sch.pdf/download.html.Unable to post directly as over 1MB forum attach limit.Files also posted athttp://www.badcaps.net/forum/showthread.php?t=15169
Generator - Page 1
Forum section: electronics / testgear

author: cap4096
author_rank: Contributor
timestamp: October 04, 2014, 11:34:24 pm
content: Hi!I am looking for a good but not too expensive signal/function generator.This is what i am looking for:- Sinus, Triangle, Square waves.- Generate a single shot pulse / step.- Being able to sweep between two frequencies.- Bandwith < 0.1Hz up to 10Mzh (upper limit not to important).- External trig (trig a sweep / pulse / step. )Any suggestions are welcome./Cap4096

author: kc9qvl
author_rank: Regular Contributor
timestamp: October 05, 2014, 02:10:43 am
content: Cheaper but might meet your needs the Siglent sdg1025. Better Best bang for the buck would be the rigol dg1022.

author: cap4096
author_rank: Contributor
timestamp: October 06, 2014, 04:55:59 pm
content: That is my conclusion also..It will be the rigol 1022 or 1022a/Cap4096

author: LaurenceW
author_rank: Frequent Contributor
timestamp: October 06, 2014, 07:12:05 pm
content: I HAVE a Rigol DG1022, and it is a very nice piece of kit for the money. It hasn't let me down or caught me out yet.Be aware that it only manages 20/25MHz as a pure sine wave. Triangle/ramp waveforms only go up to 150KHz, for instance. This is not uncommon in this class of instrument. If you need faster than that, you're simply gonna need to spend more.The DG1022 suits my purposes well, though programming the Arbitary Waveform Generator is a bit of a pig. Don't need Arb? Then it won't be a problem!Purely suspicion on my part, but I believe it to be better made than the Siglent equivalents. They smack of the budget end of the budget end (to me).

author: maelli
author_rank: Contributor
timestamp: October 06, 2014, 08:06:49 pm
content: have a DG1022 too and I am very happy with it.Price/performance is excellent.And it is dual channel, the first one with more output swing, 20V ppthe second one only 6Vpp.So you get 2 generators for the price of one.I played with the PC software (to make my own waveform), but thatis not worth it. Forget it.

author: cap4096
author_rank: Contributor
timestamp: October 07, 2014, 08:44:00 pm
content: I ended up ordering 1032z instead. It has nicer display and ethernet + big buffer./Cap4096
EDN: The scope ... from Hell! - Page 1
Forum section: electronics / testgear

author: David Hess
author_rank: Super Contributor
timestamp: October 06, 2014, 07:50:29 pm
content: I ran across this on EDN and gave thanks that I avoided this manufacturer. The digital storage oscilloscope brand is revealed at the end:http://edn.com/electronics-blogs/test-voices/4435528/The-scope-from-Hell-My favorite bug is the first one listed:Bug 1aWhen using the math function, turning off the source channel(s) also turns off the math function. This should not happen according to the manual. There are many times one wants to see only the math trace.Workaround: Leave the source channel(s) on and turn down the display intensity. This dims both channels, but leaves the math function visible since it has no intensity adjustment. (A bug dressed up in a tux becomes a feature.)

author: marshallh
author_rank: Unknown
timestamp: October 06, 2014, 08:13:51 pm
content: Looks like a Siglent

author: Lunasix
author_rank: Regular Contributor
timestamp: October 06, 2014, 08:37:58 pm
content: It is ATTEN (= Siglent ?)

author: nctnico
author_rank: Super Contributor
timestamp: October 06, 2014, 08:39:14 pm
content: Nope. If you click to the other thread you'll see it is about an oscilloscope (or something that looks like it) from Atten

author: SeanB
author_rank: Super Contributor
timestamp: October 06, 2014, 08:41:25 pm
content: Click on the PDF and you get atten at the bottom.

author: MadTux
author_rank: Frequent Contributor
timestamp: October 07, 2014, 12:51:50 am
content: Oh how I love my bug free analog scopes.Only press the power button and they just work, beauty from a time when things were simple and functional and you could get high quality China free instruments.Only sticking relays and bad contacts of socketed transistors are a bit annoying sometimes.

author: nanofrog
author_rank: Super Contributor
timestamp: October 07, 2014, 05:45:17 am
content: Quote from: Lunasix on October 06, 2014, 08:37:58 pmI'm under the impression it is (Siglent being a subsidiary of ATTEN).
Rigol DS1074Z vs DS1102E vs DS1102-DEMO - Page 1
Forum section: electronics / testgear

author: jGalt
author_rank: Contributor
timestamp: October 07, 2014, 04:53:17 am
content: Hey all,So I read the post stating "newbies please read first", and then I used the search function and read a ton of posts about the DS1074Z but I still have questions..... hopefully this isn't too irritating, advance apologies if it is.I understand the DS1074Z has 4 channels and 70Mhz while the DS 1102E has 2 channels and 100MHz. Some background, I'm going into my last year as an undergrad EE and I am a hobbyist but I still can't tell if the $176 difference is worth it. I'm happy to spend it but I don't know if the DS1074Z will actually last longer or give me more than the DS 1102E because of the 30Mhz difference... will I want to measure things faster than 70Mhz? Everyone talks about "hacking" the DS1074Z, I'm assuming that increases your bandwidth?To make the choice even more difficult tequipment offers the 1102E as a demo for 40 dollars less. So now the difference between a demo and the DS1074Z is over 200 dollars.I do get student pricing. Just hoping for some friendly advice.Thanks again.

author: Mark_O
author_rank: Frequent Contributor
timestamp: October 07, 2014, 05:03:49 am
content: Quote from: jGalt on October 07, 2014, 04:53:17 amJust get the "50 MHz" DS1054z, for $399, and "adjust" it to 100 MHz (or 150, your choice). Do some reading here to find out more.That's about as friendly as it's gonna get, for a topic that's being hotly discussed right now in current threads.

author: jGalt
author_rank: Contributor
timestamp: October 07, 2014, 05:04:36 am
content: Should've read more! Just read this threadhttps://www.eevblog.com/forum/testgear/new-rigol-ds1054z-oscilloscope/and they make it sound like the DS1054z is the one to start with at the moment.

author: jGalt
author_rank: Contributor
timestamp: October 07, 2014, 05:06:01 am
content: Thank you Mark, and yeah I agree I posted too early. I would take down the whole thing if I could. Sorry everyone that wasted time reading this.
Buy a Power supply --- Rigol DP832 OR DP832A? -----help me! - Page 1
Forum section: electronics / testgear

author: htctech
author_rank: Newbie
timestamp: October 05, 2014, 02:18:28 pm
content: hi guys,I want to buy a power supply, select between DP832A and DP832. I have read many posts related DP832 in this BBS, but few mentioned the DP832A. So, I have a question, hope somebody can be provide more information for me. Thanks a lot!The difference how much between DP832A and DP832(cracked all)?Actually, I am most concerned about is whether DP832A has the same hardware issues?Thanks again!

author: con-f-use
author_rank: Unknown
timestamp: October 05, 2014, 03:49:33 pm
content: The DP832A is the essentially the DP832 with the precision option unlocked and a fancy color screen.Therefore it is my feeling, that everyone should better save the money and buy the DP832. Especially since you can unlock the precision option for free, if you are RS323-so inclined.

author: eurofox
author_rank: Unknown
timestamp: October 05, 2014, 03:57:55 pm
content: Quote from: htctech on October 05, 2014, 02:18:28 pmI order the DP832 and after one month they just add more time for delivery and pay the extra for the DP832A that was available immediately.Check video from Dave with respect to the latest version (temperature issue) that they don't supply you an old stock unit with problems.

author: htctech
author_rank: Newbie
timestamp: October 06, 2014, 01:13:15 am
content: Thanks!I have seen a few video from Dave, Such as DP832 "introduction" "Bad design Investigation" "Followup", and "DP832 Firmware versions and bugs/issues" from Sparky.I am most concerned about is whether DP832A has the same hardware issues?

author: htctech
author_rank: Newbie
timestamp: October 06, 2014, 04:07:18 pm
content: need more infomation..........Thanks!

author: Creep
author_rank: Regular Contributor
timestamp: October 06, 2014, 04:22:17 pm
content: The issues Dave discussed have been fixed for quite a while already. Just make sure when you buy your equipment you don't get some very old revision of the DP832 and you will be fine.There is no reason to get the DP832A seeing as it costs a lot more and offers practicly nothing more (aside from the 0.001V resolution, witch can be enabled on the DP832 anyway). Some people even loathe the DP832A interface.

author: con-f-use
author_rank: Unknown
timestamp: October 06, 2014, 04:46:27 pm
content: Quote from: htctech on October 06, 2014, 04:07:18 pmwhaaaaat kiiiiinnd oooofffff infoooommmmaaaaatiiiooooonnnnn......?

author: htctech
author_rank: Newbie
timestamp: October 07, 2014, 01:44:09 am
content: Quote from: Creep on October 06, 2014, 04:22:17 pmthanks
T.equipment. Vendor - Page 1
Forum section: electronics / testgear

author: radiogeek97
author_rank: Regular Contributor
timestamp: October 06, 2014, 10:59:57 am
content: Just curious if anybody knowsI was looking for some equipment from tequipment.net. Dp832 maynuo dc load. I am fortunate to work at a local university so the vendor has a little price break. Has anybody been Abel to use the eevblog discount plus an additional discount. Just curious. Thanks

author: Mandelbrot
author_rank: Regular Contributor
timestamp: October 06, 2014, 12:43:36 pm
content: They told me I had to use one or the other, but I'm only a student, so I don't know. I've heard of someone that said they were able to use both.

author: Gallymimus
author_rank: Regular Contributor
timestamp: October 06, 2014, 01:44:20 pm
content: I saw a note on the forum about someone using both, but it's not verified. It may just depend who you talk to.If you get an electronic quote from them, and then try to purchase online, you may just be able to pop the eevblog code in to double up discount?!

author: radiogeek97
author_rank: Regular Contributor
timestamp: October 06, 2014, 02:12:00 pm
content: no worriesyou cant i called t-equipment still good pricing though and very helpful folks
Megger CM500 teardown - Page 1
Forum section: electronics / testgear

author: bigsky
author_rank: Regular Contributor
timestamp: October 05, 2014, 10:38:26 am
content: Guys and gals, would you like to see some internal pics of a Megger CM500? It's an electricians multifunction tester, the predecessor to the MFT15xx and MFT17xx models. It measures voltage, resistance, loop impedance, insulation resistance, and tests RCDs and contains some vaguely-interesting stuff. Let me know...

author: retiredcaps
author_rank: Super Contributor
timestamp: October 05, 2014, 05:05:47 pm
content: Yes, pics please.

author: sotos
author_rank: Frequent Contributor
timestamp: October 05, 2014, 08:52:24 pm
content: Yes pls.

author: bigsky
author_rank: Regular Contributor
timestamp: October 05, 2014, 10:27:11 pm
content: Watch this space...