hybridfree/eevblog-posts huggingface dataset:
Best bang for the buck Flir camera? - Page 1
Forum section: electronics / testgear

author: jdraughn
author_rank: Regular Contributor
timestamp: November 17, 2015, 01:11:48 pm
content: Hi, I am looking to buy a Flir camera or module that works in an Android phone and was wondering if I could get the low down on the differences between the Seek Thermal and Flir One modules. (other then just price and specs). Also, does anyone know why the iPhone modules are SOOO much cheaper then the Android versions?I am thinking that I will be able to get a new Flir One module for Android for about 200.00 when Amazon does their yearly cyber Monday/Black Friday thing but am wondering if I should get a Seek thermal instead. Some of the existing threads posted in these forums are so incredibly long and convoluted, that I gave up trying to figure out if one is better or worse then the other in any particular way.I would like to get the Flir camera so I can see where the biggest problems are on my house as far as leaks and insulation goes. The house is about 80 years old and could probably do with new Windows and more insulation in the Attic, but I wonder if some windows are way worse then others or if I should do the attic first, or what.Thanks for any buying advice you guys can offer me.

author: umkumiut
author_rank: Contributor
timestamp: November 17, 2015, 07:04:11 pm
content: Hi,I bought a 1st gen Flir one (for iPhone 5) on summer and I'm pretty happy with it. It has the MSX technology which is nice, sensitive enough to show very little temperature difference and suprisingly accurate. I think it has a good value at this price (I paid 217USD after tax).

author: encryptededdy
author_rank: Frequent Contributor
timestamp: November 18, 2015, 10:31:53 am
content: Quote from: jdraughn on November 17, 2015, 01:11:48 pmFor the FLIR One they're the same price. For the Seek... the iOS version is cheaper, however it didn't use to be. I expect the Android version to come down in price soon.Either way, for home inspection, get the FLIR One. It has better sensitivity and you'll need that more than the higher temp range of the Seek.

author: jdraughn
author_rank: Regular Contributor
timestamp: November 18, 2015, 12:08:52 pm
content: Quote from: encryptededdy on November 18, 2015, 10:31:53 amThank you, that is exactly the type of answer I was looking for. I was learning toward the Seek camera because of price, but I didn't realize the Flir camera has better sensitivity.
Systron Donner 6153 purchased - manual? - Page 1
Forum section: electronics / testgear

author: TAMHAN
author_rank: Frequent Contributor
timestamp: November 16, 2015, 08:35:31 pm
content: Hello folks,now that the ebay has cleared (), I can announce that Tamoggemon Holding just bought a Systron Donner 6153. We plan to gib out the Nixie tubes, and replace it with a custom digital circuit which will bring this 3GhZ counter into the 21st Century,Sadly, we are now looking for the service manual. Does anyone of you have a scan or something on hand? I looked in newsgroups and found one gentlemen's posting, who has, however, since passed away.So, if anyone of you has a PDF, I would be really thankful! In addition to that, if anyone of you has a 615x and would be interested in a digital upgrade, please let me know.TamP.S. My new lab (in new appt) should be done on the 25th, as the devices trickle in then. The device will, of course, be viewable...and I will post about it as I get it and work on the upgrade.
My DSO probes (o; - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: November 15, 2015, 08:32:29 am
content: What to do on a Sunday morning?Well..thought hooking up all my DSO probes lying around and compare them with the built-in Cal output on the 9354AL...The top trace is always the Chinese 500MHz model P6500 compared to a PP005, HP 10441A, HP 10018A and an unknown model M12...So would a PP006 show a similar trace as the HP 10441A/10018A? Seems those two models have the best bandwidth....Interesting is the fact that most PP00X probes on Ebay are missing the hook tip and still want to charge big bucks (o;The HP 10441A probes seems to be more attractive in price...and some even are complete...

author: joeqsmith
author_rank: Super Contributor
timestamp: November 15, 2015, 04:27:36 pm
content: How did you connect them to the calibration output?

author: davorin
author_rank: Unknown
timestamp: November 15, 2015, 04:29:21 pm
content: Well..of course totally high-end connection (o;With an open ended BNC cable ;-)From the looks it might be that the HP probes are better than the PP006...

author: tggzzz
author_rank: Super Contributor
timestamp: November 15, 2015, 05:53:09 pm
content: Quote from: joeqsmith on November 15, 2015, 04:27:36 pmFrom the ringing, I guess a 6"/15cm ground lead is involvedIf so, the trace could be improved by using the standard spring wire ground connection, or by using a homebrew spear tip inspired by HP 1.5GHz passive probes. FFI, seehttps://entertaininghacks.wordpress.com/2015/04/23/scope-probe-accessory-improves-signal-fidelity/

author: davorin
author_rank: Unknown
timestamp: November 15, 2015, 05:55:40 pm
content: Well...I was just curious how "good" the Chines 500MHz probes are compared to the existing ones I have (o;Yes...the DSO was switched on/off only for a short time and hasn't been self-calibrated for a long time...
Agilent DSO1072B scope issue - Page 1
Forum section: electronics / testgear

author: vinicius.jlantunes
author_rank: Regular Contributor
timestamp: November 15, 2015, 07:44:12 pm
content: Luckily this is still under warranty for another year, but my scope seems to have some strange issue that I thought of sharing with you guys, just so we can speculate at what the problem is.Watch the video - the scope basically starts showing a weird signal, completely off scale; it happens randomly (sometimes I go for weeks with no issues, then it starts happening again).I exchanged some emails with an Agilent engineer about a year ago when I first had this problem, but decided not to send the scope to Agilent at that time as it would take a while for me to get it back and I needed it for doing stuff. Then it sat for a while unused, and then when I wanted to use it again it started misbehaving again...A while after I shot the video it started working again just fine and I could do the measurements I needed. This time though I will send it to Keysight... it's a good thing I shot the video, cause the issue is a bit random and it could well be that it does not happen for the engineer to seehttps://youtu.be/vPM0FMT6izMEDIT: grammar

author: rsjsouza
author_rank: Super Contributor
timestamp: November 15, 2015, 08:39:33 pm
content: vinicius, it looks like something rooted in thermal or connection issues - something related to the ADC output that is causing it to overflow (0x7F for 8-bit). But I can only guess.However, will you be able to send to Keysight Brazil? Otherwise you will pay an arm and a leg for the tax... Only under this scenario I would be brave enough to try and open it.

author: vinicius.jlantunes
author_rank: Regular Contributor
timestamp: November 15, 2015, 08:58:53 pm
content: Yeah, I think I can send it to Sao Paulo. I bought it here from farnell. In the emails I exchanged with them about a year ago they mentioned about sending it to Sao Paulo.
Any HP E1401B users here? (o; - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: November 15, 2015, 08:30:23 pm
content: Just curious if there are any HP E1401B VXI mainframe users here who can tell anything about the power requirements...especially what power it uses for example with no cards installed....or if it will main fuse at home anytime I power it on (o;The datasheet isn't specific about it...only that the inrush current can be up to 40A high....
OWON SDS7102V measure in FFT - Page 1
Forum section: electronics / testgear

author: EEBlackSheep
author_rank: Contributor
timestamp: November 08, 2015, 07:42:51 pm
content: I have an OWON SDS7102V scope. I am trying to measure the the frequency and voltage/dB. I tried cursors without much luck. The manual has no info on how to use cursors or measurements in FFT.thanks.

author: EEBlackSheep
author_rank: Contributor
timestamp: November 16, 2015, 03:46:02 pm
content: If anyone is interested, check out this blog posting on how to measure FFT with the Owon SDS scope.https://donstechnologyblog.wordpress.com/2015/11/11/fft-cursor-measurement-with-owon-sds-oscilloscope/
Tektronix 2213A Manual - Page 1
Forum section: electronics / testgear

author: dan3460
author_rank: Frequent Contributor
timestamp: November 14, 2015, 10:15:13 pm
content: This is another project that will end up with a kid that is learning electronics. Looking for the service manual for the 2213A. I have the one 2213 but it is not same, mostly around the attenuators and trigger system.Does anyone have a copy of this manual?Thanks
HTBasic/HPBasic and ALMA - Page 1
Forum section: electronics / testgear

author: merox
author_rank: Regular Contributor
timestamp: November 13, 2015, 05:49:05 pm
content: Since i've got no idea where to post this (but it's at least somehow test gear related) i'm posting this here.At work I found an acient Floppy together with a Dongle for a software called ALMA from 1999 (Version 8.80 or something).That software can be used to create flowcharts for HTBasic/HPBasic programs which we use for automated production tests. The software itself works when used with the supplied "SAMPLE" file, but i can't get it working with one of my programs. Does anybody know what kind of file format I have to supply to ALMA?I have several Versions of HP/HTBasic (HTBasic 6.33, HTBasic 9.x and also 10.X) on my hand to try it out.Hope anybody knows something about this ancient software. I can supply an Trial-Version of this Software if anybody wants to get a hand of this, but it only works with the "SAMPLE" file. The trial is "SECURED" but you can UNSECURE it if you know how...Also information about if the company that made that software still exists would be appreciated.EDIT: Forgot to mention that the company that made it is called "Datarota" but it can't find any substantial information about it.
Hameg 8014 service manual ? - Page 1
Forum section: electronics / testgear

author: kripton2035
author_rank: Super Contributor
timestamp: November 14, 2015, 11:13:14 am
content: Hi,I dont understand Hameg policy about service manualsyou can get quite a lot of service manuals on their website, but not some like the HM8014 I'm looking forwhy can you find it for $$$ on certain web sites, and not free ?the 8014 is an old test gear that is not sold anymore, the schematics should be free ? like the other old hameg instruments.anyway if someone has a free download link I would appreciate it.thanks.

author: Smith
author_rank: Frequent Contributor
timestamp: November 14, 2015, 11:50:54 am
content: I am told all Hameg service manuals become available (for free) 10 years after the product has been discontinued.

author: Arjan Emm
author_rank: Regular Contributor
timestamp: November 14, 2015, 12:21:34 pm
content: If you mail them, they usually send it to you.
RF Dummy Load with test output - Page 1
Forum section: electronics / testgear

author: Martin.M
author_rank: Frequent Contributor
timestamp: November 14, 2015, 12:52:09 pm
content: Spinner BN515038/50Ohms with N Input,that have a 3-pin- output for connecting Testequipment. I need to know what I will find there.To test is an vintage Eico TRX with 120W pep.greetingsMartin

author: SeanB
author_rank: Super Contributor
timestamp: November 14, 2015, 01:25:31 pm
content: 3 pins, so you generally have 2 types of power meter used. First would be a simple diode detector, using a germanium diode and probably a voltage divider before it, and a small capacitor to hold the peak voltage. Otherwise it could be a thermocouple measuring temperature rise of the element.Simplest is to undo those top flat head screws and gently lift the connector off to see what they did. Careful as it likely will be full of insulating oil, so use a tray to contain the spill.

author: AF6LJ
author_rank: Unknown
timestamp: November 14, 2015, 01:33:44 pm
content: My thinking is the three pins areGroundA low power rectified sample pin for use with a meter movementA high power rectified sample pin for use with a meter movement.
HP6632B digital board - Page 1
Forum section: electronics / testgear

author: artag
author_rank: Super Contributor
timestamp: November 13, 2015, 09:33:22 pm
content: I have a 6632B that behaves badly : after being switched on for a few minutes, the measured voltage and current are close to zero. The output is fine, it's just the displayed value. It hops around a bit (flickering value, OVF etc) before failing completely.I suspect the AD677 - it appears to have the correct (multiplexed and scaled) voltage at its input, but it might be that it's being read badly. Freezer spray has no obvious effect. There's a small cap on the input pins and a couple of resistors strapped across a nearby part that aren't present on my other 6632B. Looks like an attempted repair, or a mod, I don't know.Unfortunately, the manual linked to elsewhere on this forum doesn't include a schematic for the digital board. I don't know why this is - presumably the first signs of the creeping menace of 'no user-serviceable parts'.Does anyone have a schematic of the digital board, please ?

author: davorin
author_rank: Unknown
timestamp: November 14, 2015, 08:33:28 am
content: Do you get the same wrong reading via RS232/GPIB?
Marconi TF2600B manual - Page 1
Forum section: electronics / testgear

author: Sferix
author_rank: Contributor
timestamp: November 12, 2015, 08:34:21 pm
content: Can anyone help me with the manual / circuit diagram for a Marconi TF2600B voltmeter or the TF2600A voltmeter please. To be clear this is the TF2600B or TF2600A transistorised models not the TF2600 valve model. Thanks

author: Sferix
author_rank: Contributor
timestamp: November 14, 2015, 10:55:46 am
content: bump
Unknown text on R&S HMO1002 display - Page 1
Forum section: electronics / testgear

author: mehdi
author_rank: Regular Contributor
timestamp: November 16, 2015, 09:31:57 pm
content: HiI'm completely new to oscilloscopes and R&S (Hameg) HMO1002 is my first oscilloscope.There is a text on the bottom of display, saying "QMA: n/aV" in Red. I've never seen this message in HMO1002 video tutorials.How can I get rid of it?I couldn't find it in user manual.I've attached a screenshot.ThanksMehdi

author: Neganur
author_rank: Unknown
timestamp: November 16, 2015, 11:08:46 pm
content: I'm not sure, but to me it looks like it's trying to measure something but has insufficient data or waveform to display a number.Further, assuming red indicates a failure to get a value, 'n/a' (=not applicable) being the value and 'V' for volts.Some failed SCPI command...? I think QMA is the name for the active math channel, i.e. when you use a function like cursors not on trace 1 or 2 but on MATH.

author: gsocker
author_rank: Contributor
timestamp: November 17, 2015, 02:18:47 am
content: Quote from: mehdi on November 16, 2015, 09:31:57 pmYou've activated the Quick Math(QMA) function. The menu for this can be displayed by pressing the MATH button on the front and you should be able to turn it off by that button twice: the first will bring up the menu and the second will deactivate it. The button should be lit if it's turned on.

author: mehdi
author_rank: Regular Contributor
timestamp: November 17, 2015, 07:22:46 am
content: Quote from: gsocker on November 17, 2015, 02:18:47 amThank you. That was it.
Tektronix P5200 Differential Probe Teardown - Page 1
Forum section: electronics / testgear

author: radioFlash
author_rank: Regular Contributor
timestamp: March 02, 2015, 01:01:00 am
content: Here's a teardown of the Tektronix P5200 differential probe.You can compare this to a teardown of the Pintek DP-25 that another user did recently (https://www.eevblog.com/forum/testgear/teardown-pintek-dp-25-differentail-probe/msg169543/#msg169543)and Tektronix P5205 (https://www.eevblog.com/forum/testgear/tek-p5205-hv-differeantial-probe-teardown-btw-what-are-the-red-and-brown-wires/).The probe has a switchable 1/50 or 1/500 range setting and input range of ±1.3 kV with 25 MHz bandwith.* The board appears to be a 4 layer PCB.* There is a metal shield in the case (the vertical line in the photos) between the input and output sections. Additional shielding is provided on the top and bottom of the probe by foil which is sandwiched between what looks like paper.* The input goes through a pair of 2M resistors per side which then goes to a MAX436 (U5) amplifier.* It requires a 9V external power supply which plugs into a jack that's on the cable that also has the BNC output.* It has a built in SMPS using the MAX739 to generate a -5V rail which is on the lower right of my photo.It seems to be noisier than I expected. Also, it had a bit of DC offset when I received it, but I was able to remove it by tweaking the trimpots.These are the ICs used by the probe:U2 Elantec EL2120CN 100 MHz Current Feedback Amplifierhttp://www.intersil.com/content/dam/Intersil/documents/el21/el2120.pdfU3 Analog devices AD818AN Low Cost, Low Power Video Opamphttp://www.analog.com/media/en/technical-documentation/data-sheets/AD818.pdfU4,U8 78L05 5V regulatorhttp://www.ti.com/lit/gpn/lm78l05U5 Maxim MAX436CPBD Op-Amphttp://datasheets.maximintegrated.com/en/ds/MAX435-MAX436.pdfU6 MAX739CPDhttp://datasheets.maximintegrated.com/en/ds/MAX736-MAX759.pdfU9 LM311P Differential Comparatorshttp://www.ti.com/lit/ds/symlink/lm111.pdfIn the photo of the PCB, I inverted the back side of the PCB and overlayed a transparent copy of the topside to correlate the traces with the compoents.The first oscilloscope capture is of a 2Vpp 10Khz with the original source in blue and slightly offset so you can see the output.The second capture is of a 500 kHz square wave.The third capture is of a low level signal . Here, the noise is very visible, even with BW limit set to 20 Mhz.The user manual is attached, but it doesn't have a schematic. Does anyone have a pointer to the schematics?

author: Mechatrommer
author_rank: Super Contributor
timestamp: November 13, 2015, 05:25:51 am
content: bump! thumbs up for teardown and some performance shots...
New Keysight U1240 Handheld Multimeter - Page 1
Forum section: electronics / testgear

author: Huluvu
author_rank: Regular Contributor
timestamp: November 12, 2015, 05:11:37 pm
content: Looks like Agil... ähm Keysight released some new devices

author: Huluvu
author_rank: Regular Contributor
timestamp: November 12, 2015, 05:14:27 pm
content: Sorry just found out somebody mentioned this before (search doesn't show up anything)Please delete
DS203, aka DSO Quad - is it any good for slow stuff? - Page 1
Forum section: electronics / testgear

author: Artlav
author_rank: Frequent Contributor
timestamp: November 11, 2015, 11:57:03 pm
content: I've been hearing some good things about DS203 by Seeedstudio.Have anyone tried or used this one?I often need to look at all sorts of logic-level stuff, like I2C bus bugs, audio signals, all sorts of logic and other slow, low power signals.And it's a pain to haul out the big Rigol for all this, so a small cell phone-sized scope would have been perfect.Now i heard that the previous models were a fiasco, so is this one any better for these sorts of tasks?

author: new299
author_rank: Regular Contributor
timestamp: November 12, 2015, 12:12:18 am
content: Quote from: Artlav on November 11, 2015, 11:57:03 pmI think there are quite a few posts about the Quad already but...In my opinion it's not much good. Pretty much any other scope is better. For me it isn't just a bandwidth issue, it's just largely unusable as the interface is poorly designed. I'd get a Rigol, Hantek or even an old analogue scope in preference to the Quad. If you need something portable, I believe Hantek/Rigol have cheapish options.

author: Artlav
author_rank: Frequent Contributor
timestamp: November 12, 2015, 12:29:00 am
content: Quote from: new299 on November 12, 2015, 12:12:18 amStrange, the forum search haven't returned anything more than occasional mentions here and there.Do you have any links?

author: fc12
author_rank: Newbie
timestamp: November 12, 2015, 09:29:38 am
content: Quote from: Artlav on November 11, 2015, 11:57:03 pmBecause I was very disappointed with the Hantek 6022 I got a DSO203. It is indeed a nice tool, I used it with my arduino projects and it does what is promised in the advertisement. The big drawback is, as already mentioned by new299, the user interface. Fiddling with the tiny buttons, sliding left/right pushing, orientation in the confusing menu system, this all is very cumbersome. If you want something that fits in an already stuffed toolbox for occasional use, something that runs on battery for quite some time or your budget is limited, it might be an option. If you use it daily - or close to - then I would go for a device with real vert/horiz knobsDaniel

author: Fungus
author_rank: Super Contributor
timestamp: November 12, 2015, 11:24:03 am
content: I've got one. It works. I don't have a problem with the functionality for Arduino-frequency work (in fact I really like the small size!)But ... the usability is awful compared to a real 'scope. It's all fiddly buttons, a dozen button presses to change just about any setting. Patience is essential.If your main reason for wanting one is that it's a "pain to haul out the big Rigol" then it might not be for you.
Help identify bench DMM - Page 1
Forum section: electronics / testgear

author: uski
author_rank: Frequent Contributor
timestamp: November 12, 2015, 04:52:16 am
content: Hi,A few years ago, I bought an old bench DMM.I have no picture and only a vague idea of how it looked like; but I remember it had an internal rotary mecanism similar to the one found in many modern hand-held DMMs.What was special was that internal mecanism was motorized: when the function on the front panel is changed, an internal motor rotates the wheel to align it properly.Does this ring a bell to anyone ? I assume this motorized contactor was quite unique.Thanksuski

author: uski
author_rank: Frequent Contributor
timestamp: November 12, 2015, 07:29:34 am
content: Found it : Fluke PM2525
Mystery Agilent/Keysight ESG-A synthesizer shaft encoders - Page 1
Forum section: electronics / testgear

author: acbern
author_rank: Frequent Contributor
timestamp: November 04, 2015, 12:19:21 pm
content: I have a ESG-A E4437B synthesizer from Keysight/Agilent which unfortunatelly has a rotary encoder with a broken shaft. From what I have found out (without opening it up yet) it uses an Avago QRPG-A482 rotary shaft encoder with 32 PPR. I could not find any data of it on the web.So does anybody have? And does anybody have data for a HRPG AD32#54C or 57F which look similar and also have 32 32RPP. I could have access to these relatively easy. Thanks in advance.

author: acbern
author_rank: Frequent Contributor
timestamp: November 11, 2015, 10:50:13 am
content: Seems this has been a difficult question, given no-one in the knowledgable group here has any suggestions.Alternatively, does anybody know the Agilent/Keysight part number for the shaft encoder used in this item?

author: nctnico
author_rank: Super Contributor
timestamp: November 11, 2015, 11:01:48 am
content: You better contact Keysight about that. I have a feeling many encoders you find in HP equipment have non-standard shaft lengths.

author: KJDS
author_rank: Super Contributor
timestamp: November 11, 2015, 11:48:02 am
content: Any idea what other units this is used in?

author: MadTux
author_rank: Frequent Contributor
timestamp: November 11, 2015, 12:41:56 pm
content: The older HP instruments (3326A/8662A/8568/8672A/3585.....) all use those HP custom made black rotary enoders that are interchangeable between different instruments. The only thing that sometimes breaks in older encodes are the light bulbs, apart from that they last forever. But that is quite easy to fix.Newer instruments use same modell, except is uses LED instead of light bulb, but apart from that, it's compatible to the old encoders.Don't know what kind of encoder that E4437B uses, but I would guess that it's the ususal HP rotary encoder which they already have used for years.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: November 11, 2015, 12:57:20 pm
content: Hi,Look here:http://pdf1.alldatasheet.com/datasheet-pdf/view/115415/HP/HRPG-AD32.htmlThere is a datasheet for this type of encoders.Regards,Jay_Diddy_B

author: PA0PBZ
author_rank: Super Contributor
timestamp: November 11, 2015, 04:44:40 pm
content: Quote from: Jay_Diddy_B on November 11, 2015, 12:57:20 pm"Your require pages is cannot open by blow"I see...

author: acbern
author_rank: Frequent Contributor
timestamp: November 11, 2015, 04:52:51 pm
content: Jay_Diddy,thanks, that was pretty helpfull! At least this allows to do some measurements on the QRPG encoders to see if pinning matches with the HPRG I recently bought QRPG data sheets still not found, if someone knows, would be glad to know.Re. other comments, the rotary encoders found in other instruments (e.g. 8590-series spectrum analyzers) is different mechanically, but seems the QPRG and HPRG are pretty similar in shape, the latter being available at decent prices.acbern
Benefits of a VXI controller like HP E6233A - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: November 10, 2015, 08:25:57 pm
content: Still haven't decided yet regarding a VXI mainframe (o;What is the benefit of using a VXI controller over a command module?Can I transfer data faster with a VXI controller with ethernet port than with a GPIB command module?Or are the VXI controllers more a way to have a standalone system?

author: eas
author_rank: Frequent Contributor
timestamp: November 10, 2015, 11:23:40 pm
content: For my various free-standing DMMs, etc, I picked a GPIB/VXI-11 gateway in large part for flexibility.The communications protocol is encapsulated as a (python) library, rather than an OS level driver, which makes it easier to develop python test scrips on my Mac laptop and push things to my pre-existing linux server without having to worry about the compatibility issues that come with a lower level USB/PCI/ISA, etc driver. The other flexibility is that I can have my equipment rack in one place, and the acquisition controller in another, saving me from having one more computer to worry about.
Hantek DSO5102B hangs at step 8/36 of self calibration - error code 0x400 - Page 1
Forum section: electronics / testgear

author: app-note
author_rank: Newbie
timestamp: November 10, 2015, 08:25:07 pm
content: The scope is of revision hw1005, hacked to 200MHz bandwidth and updated to firmware 130814 roughly 2 years ago.No issues since then - except for the well-known software kinks - but self-calibration failed today.Any idea, how to fix it ? Is it caused by a HW defect or maybe a corrupted configuration file ?
CRTU-RU PCMCIA drive lockup - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: November 09, 2015, 04:56:27 pm
content: Does someone know how a PCMCIA card, or in my case, a CF card with CF/PCMCIA Adapter, has to be formatted that the CRTU-RU won't lockup during OPSW Startup or print screen to disk or tell me to insert a disk?Formatting under Win8.1 as FAT or FAT32 doesn't help...do I have to format them under CRTU-RU DOS or Windows2000?It did work at some time......maybe some disk size limit on pcmcia bus?

author: davorin
author_rank: Unknown
timestamp: November 09, 2015, 05:13:48 pm
content: Stupid me (o;The 4GB card worked at some time because there was a previous Linux installation on it with a small DOS partition <= 128MB (o;128MB is the limit it seems as 256MB and above start lockups..

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: November 09, 2015, 08:10:49 pm
content: Quote from: davorin on November 09, 2015, 05:13:48 pmIt's probably more down to the cards, as I use Transcend 1GB and 4GB CF cards with no problems (however an Apacer 4GB and Sandisk 4GB card doesn't work).

author: davorin
author_rank: Unknown
timestamp: November 09, 2015, 08:14:13 pm
content: Yes...128MB is the limit either with cards or a DOS partition....that's why I got "divide errors" when doing a "dir d:"Case closed ;-)

author: ruffy91
author_rank: Regular Contributor
timestamp: November 09, 2015, 08:15:52 pm
content: There are CF Cards configured as removable drive and others as fixed drive. We have Intel 486 and AMD Geode PC/104 SBCs. Both boot only from fixed drive ones.Edit: Look here (ca. middle of page)http://www.thinkwiki.org/wiki/CompactFlash_boot_drivefor tips installing DOS/Windows on CF cards with removable bit set.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: November 10, 2015, 07:27:29 am
content: Quote from: ruffy91 on November 09, 2015, 08:15:52 pmThat may be true however IDE mode doesn't matter much when using CF cards via CF-to-PCMCIA adapter in a CRTU-RU's or CMU200's PCMCIA slots (and which is where davorin is having problems), and these PCMCIA slots are not used (and can't be used) for booting anyways.
+/- 24V Current Limited Power Supply - Page 1
Forum section: electronics / testgear

author: TWeaK88
author_rank: Newbie
timestamp: November 12, 2015, 01:46:25 am
content: Hey there,I'm looking for a +/-24V power supply with the ability to limit the current. I've had trouble finding one so far. In the past I've had a HP 6237B, which has +/- 18V but no current limiting. (The B&K 6237B)1) it there a reasonably priced one that exists?2) Can I use two 0-30V current limited supplies with the positive of one and the negative of one hooked together and use that as the ground reference for the circuit?I'm at a loss as to what to do.Thanks in advance-Nicholas

author: eas
author_rank: Frequent Contributor
timestamp: November 12, 2015, 06:34:37 pm
content: You could use two supplies if they both have floating outputs, you should be able to tie the negative of one supply to the positive of the other, and then, optionally, tie that common to ground. One hint that a supply has floating outputs is that it will have three terminals, +, - and GND.What do you consider a reasonable price?

author: smbaker
author_rank: Regular Contributor
timestamp: November 12, 2015, 06:41:59 pm
content: I have some kind of big mastech supply, I believe it's an HY3010EX-3 -- dual 0-30V at 0-10A.It came with a cracked resistor on the PCB that I had to fix, and it's a bench space hog, but something like that sounds like it would fit your purpose.
Samlex pure sign wave 1500 watt inverter de-lid - Page 1
Forum section: electronics / testgear

author: dr.diesel
author_rank: Super Contributor
timestamp: November 09, 2015, 08:21:26 pm
content: Not a teardown, just a single pict and a couple of thoughts. I needed an inverter for a UPS type of application, with previous good Samlex luck and (54) 4.6 out of 5 stars on Amazon I didn't hesitate too much.Anyhow I popped the lid off just to inspect the build quality. At first glance, and given the color of the caps I thought everything was great until I rotated it around and saw the caps were Lelon,, at least they are 105C I guess. (although I don't recall the last time I replaced a bad Lelon)It appears the 1500 and 2000 watt share the same board, only obvious difference is one 40 amp ATC fuse is missing on the DC side, all FETs are populated.Oh well, into production it goes, wish me luck!EDIT: sorry, this was meant for the Other Equipment section,
Esr meter from China - Page 1
Forum section: electronics / testgear

author: rounsmith
author_rank: Contributor
timestamp: November 08, 2015, 04:31:12 pm
content: I have found good words for this esr meter. It's build around a pic microcontroller and have read on badcaps.net that can measure in circuit as well.Should i go for it?Goes around 30 euros on ebay.(I have found around that price one that is designed around bob parker esr meter mk ii (http://www.ebay.com/itm/New-Digital-Capacitor-ESR-Tester-Internal-Resistance-Meter-Test-In-Circuit-/321359552328?hash=item4ad2859f48:g:yz0AAOSwofxUmXhf).Sorry for my language, i am a poor greek guy trying to set up an electronics lab for some repairs

author: kripton2035
author_rank: Super Contributor
timestamp: November 08, 2015, 04:59:43 pm
content: I don't think the second one is based on bob parker's model because it's a proprietary design with no available source or hex code for it...then the bob parker's has 2 digits, where their model has 3 digits+sort of ohm sign...it's an esr meter, but not a copy of bob parker.If you found good words for the first esr meter, why not. important is that it is in circuit, protected against charged capacitors, and somewhat good value measured.

author: Electro Fan
author_rank: Super Contributor
timestamp: November 08, 2015, 06:04:24 pm
content: Quote from: kripton2035 on November 08, 2015, 04:59:43 pmI don't know to what extend a meter can be protected against charged capacitors but this meter has a prominent warning on it saying "Discharge capacitor before measuring". The only otherESRLCR meter* I'm familiar with is the DER DE-5000 and it warns in the manual against testing charged capacitors, ie capacitors should be discharged before measuring. I think it's good practice to appropriately discharge capacitors not only before measuring capacitors but before doing almost anything else with a capacitor. There are videos, posts, and articles around on how to discharge capacitors.One other comment regarding the meter shown is that the chart printed on the meter entitled "Typical readings for good capacitors (ohms)" seems like a nice/handy/helpful feature. Having said that, it's probably worth taking a look at this thread:https://www.eevblog.com/forum/beginners/esr-values-for-electrolytic-caps/If the unit shown is safe and accurate it might be a good deal for the price.* see Kripton2035's post below

author: kripton2035
author_rank: Super Contributor
timestamp: November 08, 2015, 08:00:51 pm
content: the DEREE 5000 is an LCR meter, it is not an ESR meter for it's primary use.for me an esr meter must be somewhat protected (not eventually for high voltages) but it is to quickly check capacitors in circuit

author: Electro Fan
author_rank: Super Contributor
timestamp: November 08, 2015, 08:27:29 pm
content: Quote from: kripton2035 on November 08, 2015, 08:00:51 pmkripton2035 - Good points, Thanks, EF
HP E3630A for 2K$ - Page 1
Forum section: electronics / testgear

author: bingo600
author_rank: Super Contributor
timestamp: November 07, 2015, 06:46:28 pm
content: I wonder what he's been smokingIt's not a keypress failure , the other are also CRAZY pricedhttp://stores.ebay.com/xyza-honest/_i.html?_nkw=Agilent+E3630A&_armrs=1&_from=&_ipg=&_mPrRngCbx=1&_sop=10&_udhi=&_udlo=/Bingo

author: georges80
author_rank: Frequent Contributor
timestamp: November 07, 2015, 08:02:18 pm
content: Nutcase, unless he sells it, then he's brilliantI've got a few E36xx power supplies. One I bought new and was <$300, several I got for free from a consulting gig.Nice power supplies for what they are - i.e. stable/quiet and reliable. I'll have to try to sell my extras for $1000+ here in the US...Edit: Of course he does have the "make an offer" button enabled...cheers,george.

author: bingo600
author_rank: Super Contributor
timestamp: November 07, 2015, 08:06:33 pm
content: I payed 151€ for my E3630AAnd it really looks like the pic' ... As newwww.ebay.de/itm/HP-E3630A-Triple-Output-DC-Power-Supply-0-6V-2-5A-und-20V-0-5A-/281805300710/Bingo

author: SeanB
author_rank: Super Contributor
timestamp: November 08, 2015, 02:38:18 pm
content: No stock and he does not want to delist and pay listing fees again when he has one to sell. If somebody buys it he has plenty of profit to enable him to buy another, do a rough check it works 9 or not) and ship it forward with no cost to him otherwise.
Rigol firmware downloads without request form - Page 1
Forum section: electronics / testgear

author: thn788
author_rank: Contributor
timestamp: November 08, 2015, 09:10:38 am
content: Hi everybodySeems Rigol has started providing direct firmware downloads without going through the well known "Firmware Update Request" form. Just have a look at the product pages onint.rigol.com. For many products you find firmware download links on the right side in the "Software Download" boxes. Unfortunately not for all: at least for the bench multimeters there still seems to be no firmware. But for most other products they seem to have firmware download links and least for the DS1000Z-, DS2000- and DP8xx-lines you get the most current firmware listed on the "Firmware Update Request"-form.Unfortunately neither release notes, nor any information on which firmware version you're currently downloading. Just "black-box" unversioned rar-archives, which you have to unpack to see which version you got. Maybe that's just preparation for the holiday season? After all Christmas gifts have to be unpacked first, as well, before you see what you get... ;-)Regards

author: mcinque
author_rank: Unknown
timestamp: November 08, 2015, 11:38:16 am
content: That page is available since many months, I guess it's their response to thousands "there is any firmware update for my unit?" questions.
Connectors for low noise RG-174 triax cables - Page 1
Forum section: electronics / testgear

author: hibone
author_rank: Regular Contributor
timestamp: November 07, 2015, 11:09:16 am
content: Dear All,thanks to this forum I found out that it is possible to find low noise small sized triaxial cables at a reasonable price, see for instance:https://www.eevblog.com/forum/testgear/low-noise-triax-cable-conductive-insulation-layer/However it seems I cannot find triax connectors that fit the cable without being asked an arm and a leg for each. Could you please spare some advice about that.Since i need to carry out low voltage measurements, I may have to use copper/tin casings thus i would like to avoid to solder the cable at both ends.Thank you.
better and affordable USB sound cards for audio spectrum analysis - Page 1
Forum section: electronics / testgear

author: Rax
author_rank: Super Contributor
timestamp: November 06, 2015, 07:31:49 pm
content: I've researched the forum as much as I could, but I couldn't come up with a satisfying result to my question - what is a better, but on a budget, USB sound card that would be suitable for purposes of audio analysis through such things as ARTA or Visual Analyzer? Thinking of buffering the probes to DUT through a Peter Millett interface. Of course, they should be fairly easily available out there (a lot of the old timers recommended on various websites seem to be out of production).My pick this far is the Asus Xonar U7 (I intend to do this my trusty 17" Win XP laptop...), but I know some cards are by construction limited in bandwidth, for instance. Not sure which ones are better at this, and not sure about the U7 on this regard either. It does seem to be pretty clean in specs and... reviews though.Looking forward to hands on experience and thoughts. Thanks!

author: Rax
author_rank: Super Contributor
timestamp: November 07, 2015, 02:38:36 am
content: ...some E-MU cards may still be in production and offer good performance (the 0202, 0204, 0404...). Many people seem to favor the E-MUs for what I'm asking from it.They are owned by Creative, right? No like a whole lot.
Data logging, for tight bastards - Page 1
Forum section: electronics / testgear

author: MasterBuilder
author_rank: Regular Contributor
timestamp: November 04, 2015, 11:00:31 pm
content: Im looking for some opinions based on experience of low end data logging devices, specifically from Dataq, Measurement Computing and Picoscope. Labview is not considered here as I dont consider it low end due to the cost of the software. The general quality or not of the hardware and stability of the software is most important here, features are of lesser importance.The project Im designing has the following:Cheap and simple test jig,One analog current 4 to 20mA measurement,A digital input, for a pushbutton to trigger a measurement,Software on PC with datalogging and export to .csv file and display of measurement on screen.My Impressions(mostly not based on experience):Dataqhttp://www.dataq.com/data-acquisition/4-20mA-current-loop/Cheap.the free software crashed, buggy software?Measurement Computinghttp://www.mccdaq.com/products/product-listing.aspx?oid=1596&r=12These look like quality products.Picoscopehttps://www.picotech.com/products/data-loggerMy experience of these products is positive, the product Ive used (an old parralllel port PC oscilloscope) has worked as advertised. Not saying it was great, just that it did the job and didnt break.

author: 3roomlab
author_rank: Frequent Contributor
timestamp: November 04, 2015, 11:08:18 pm
content: DUT --> DMM --> RS232 --> USB --> log programi am still newish, maybe this will help, however its all DIY with pythonsee last few posts, it may be useful ->https://www.eevblog.com/forum/projects/is-this-a-real-ns-lm399-%28from-polida-ebay%29/so far longest log for me is 29999 samples, i have yet to try max excel sheet's 65535 rows.atm, this is using a used keithley DMM.on the cheap side, i think Uni-T handhelds may have the cheapest log option

author: Austriacus
author_rank: Newbie
timestamp: November 07, 2015, 02:17:39 am
content: I did a lot of research and ended up with a grpahtec as I need to analyze motor starts especially synchronous motor behaviour. for the longest time I looked at the hioki data loggers some of them are not to expensive.I should get my Grpahtec GL900 in about 2 weeks and let you know how it turns out.
What handheld DMMs have closed case calibration? - Page 1
Forum section: electronics / testgear

author: bigsky
author_rank: Regular Contributor
timestamp: November 06, 2015, 05:00:26 pm
content: As the title suggests, although technically it's adjustment not calibration. We all know recent Fluke ones do, same for Agilent / Keysight, but what about other makes?

author: SharpEars
author_rank: Unknown
timestamp: November 06, 2015, 05:05:27 pm
content: Quote from: bigsky on November 06, 2015, 05:00:26 pmWhy does it matter, as long as the open case calibration is effective and lasting? Just curious...

author: Lightages
author_rank: Unknown
timestamp: November 06, 2015, 05:18:54 pm
content: I can tell you that all of the Brymens are closed case adjustment, as are the Amprobes made by Brymen, Greenlee re-badged, Extech MM series made by Brymen, etc..

author: bigsky
author_rank: Regular Contributor
timestamp: November 06, 2015, 06:52:34 pm
content: Quote from: SharpEars on November 06, 2015, 05:05:27 pmI am just curious... although, assuming the meter is made from good quality components with low drift and aging, my feeling is that closed-case adjustment done via calibration constants stored in NVRAM is a better approach than trimmers. I would reckon the former will stay in calibration for far longer than the latter, as you've got rid of the mechanical components that could be affected by vibration or thermal cycling. I expect all high-end meters have closed-case adjustment these days. Feel free to correct me if I'm wrong.

author: helius
author_rank: Super Contributor
timestamp: November 06, 2015, 07:39:29 pm
content: Open-case calibration can be a problem for precision because the thermal gradients will be different from when the instrument is closed up. There is also the possibility of damage whenever it is taken apart (and environmentally sealed DMMs with o-rings really should not be taken apart). Stability of cermet trimpots is fine, as long as quality trimmers are used they should not drift. EEPROM decay over the longer term (20 years) is a bigger problem.Besides the ones mentioned, I know that APPA 100, 300, 500 series have closed-case calibration. They are rebadged with various brands such as Tektronix and Ideal.

author: Macbeth
author_rank: Super Contributor
timestamp: November 06, 2015, 07:50:58 pm
content: My Tenma 72-7732 / UNI-T UT71D is closed case calibration, except for one multiturn trimmer for 190mV IIRC.
Current Firmware Version for Rigol MSO2072A? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: November 06, 2015, 06:03:50 pm
content: Hi, just checking to see if anyone can confirm the number of the most recent firmware for the Rigol MSO2072A (Hardware version 2.2)According to Rigol's web site the most recent Firmware version is:00.03.04SP1I currently have:00.03.03.SP1(The numbers and decimals are their convention; on the scope it is called Software version, the web site is called Firmware version)Anyone know of any upsides or downsides when moving from 00.03.03.SP1 to 00.03.04SP1 ?ThanksUpdate: Rigol has a list of the firmware updates; they looked encouraging and I gave it a try. Unfortunately, none of the changes seemed to address a few of the fundamental functional issues with the MSO2072A. I will post a separate "First Impressions" review of the findings.
Rigol DSA815 firmware upgrade - Page 1
Forum section: electronics / testgear

author: johnny_canuck
author_rank: Contributor
timestamp: July 04, 2013, 01:04:28 am
content: Rigol is showing Firmware V00.01.07, released June 1st, 2013.Anybody know what it changes or corrects?Ken

author: Pinkus
author_rank: Frequent Contributor
timestamp: July 04, 2013, 08:04:43 am
content: Here you can request the firmware:http://www.rigol.eu/firmwareVersion 00.01.07.00.01 Date 2013-05-16Changes are:1. Solve the problem LXI cannot pass the test of version 1.4.2. Solve the problem Opposite TX1000 software switch and the actual output control3. Solve the problem unable to remotely by the socket communication.4. Solve the problem input is out of range, the instrument can not operated.5. Solve the problem input save operation takes too long.6. Correct spelling errors, change ‘Input Attention ’to ‘Input Attenuation.’

author: Luv2Ski
author_rank: Newbie
timestamp: March 21, 2015, 08:42:18 pm
content: It's pretty bad when the release notes cut and paste the defect summaries in Chinglish. Sheesh, does anyone in the company speak passible English? If so, please have them proofread and update the release notes so the english speaking portion of their customer base can actually decide if they want to upgrade or not?

author: EMC
author_rank: Contributor
timestamp: March 22, 2015, 04:17:01 am
content: I have just updated from 00.01.09 to 00.01.12 and found a significant new feature, log x axis. It can be selected at the bottom of the Span menu. Attached are screen shots showing a 200kHz square wave in log and lin display for CISPR Band B, the conducted emission test frequency range. I have not been able to find a change log so clearly don't know the extent of all changes or how the update will behave on other DSA815 configurations. My existing licenses seem fine. Alot more usefull. I have checked VSWR and TG functionality, all seems fine. Love to know what else has changed. But, as I have mentioned, user beware.https://dl.dropboxusercontent.com/u/76605739/DSA815TG%20Firmware%2000.01.12.rar

author: Pinkus
author_rank: Frequent Contributor
timestamp: November 08, 2015, 01:59:34 pm
content: Here is the latest fw 1.14:http://int.rigol.com/File/ModelSoftWare/20150929/DSA815%20Software%20solidification.rarUnfortunately without a changelog; I am attaching it here
DS2072 - 56 Megs, RS232 decode, max Event Table entries = 169? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: November 06, 2015, 04:03:36 am
content: Decoding a number of RS232 data bursts and trying to compare them. Each one is 67 bytes, 69.65mS long, every 340ms. In each burst only bytes 2 & 3 are different. Trying to record as many as possible and paste them into parallel columns in a spreadsheet and see what is going on.Open up the event table and there is only 169 entries maximum.Is there any way to make this larger or is that the set limit?Memory depth = 56 Megs.