hybridfree/eevblog-posts huggingface dataset:
Some Rigol scopes are 25% off at tequipment... - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: October 13, 2015, 10:16:02 pm
content: Certain scopes - send me a PM if you want the code.ds1074z-s, ds1102d, ds2102a-s, ds2202a, ds2202a-s, ds2302a-s, ds4012, ds4034, ds4054, ds6062, mso2072a, mso2101a, mso2302a, mso2302a-s

author: nbritton
author_rank: Frequent Contributor
timestamp: October 14, 2015, 06:38:32 pm
content: The DG5352 also appears to work with this code. I picked up a MSO2072A, and they threw in the options bundle for free and also a free $50 gift card. $880 is what I spent after I use up the gift card. In other words, I got the MSO option added-on to my DS2072A for less than $100. Heck yeah!

author: nbritton
author_rank: Frequent Contributor
timestamp: October 16, 2015, 08:29:32 pm
content: The following products also work the with the 25% off code:DS2072A-SMSO2072A-SMSO2102AMSO4014 - $2594.25... now there is only 1 left in stock :-).

author: alank2
author_rank: Super Contributor
timestamp: November 05, 2015, 12:06:39 am
content: Now they are doing a free options deal on DS4000/MSO4000 and a one level bandwidth upgrade. Not sure, but if you could combine that with the 25% on some of the MSO models that might be pretty cool.
CRTU-RU FM calibration - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: October 31, 2015, 04:52:57 pm
content: When I boot up my CRTU-RU into DOS OPSW it complains then:Code:Please execute FM calibration from the maintenance menuBut in the maintenance menu there are only 3 Options to restore the Windows, DOS or Maintenance Partition...So where is this FM calibration menu hidden?

author: fisafisa
author_rank: Regular Contributor
timestamp: November 06, 2015, 02:41:47 pm
content: boot to dos and among the various menus there....

author: davorin
author_rank: Unknown
timestamp: November 06, 2015, 02:45:06 pm
content: Well..when I boot to DOS there are no menues then (o;

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: November 06, 2015, 02:49:23 pm
content: Quote from: davorin on October 31, 2015, 04:52:57 pm"Maintenance" doesn't refer to the recovery partition here.QuoteBoot into the DOS software and go to the main menu, then in the left pane to "Basic Functions" -> "Base" section and you'll see "Maintenance" in the right pane. This will lead to the Maintenance area where you can do various self-tests and perform a range of alignments (none of them need any tools aside from a RF cable).

author: davorin
author_rank: Unknown
timestamp: November 06, 2015, 03:29:41 pm
content: That was it...great, thanks :-)No cables needed at all....
Rigol MSO2000 and MSO4000 Logic Analyzer Calibration. - Page 1
Forum section: electronics / testgear

author: nbritton
author_rank: Frequent Contributor
timestamp: November 04, 2015, 10:55:46 pm
content: I asked Rigol if the MSO2000 & MSO4000 (they share the same LA parts) had a self calibration for the logic analyzer and this is the answer I got:QuoteWhat does he mean the that MSO1000Z has an active head? And also do you see it as a problem that the LA can't be calibrated?
HP 3478A Front Panel Removal issue - Page 1
Forum section: electronics / testgear

author: audiocrush
author_rank: Newbie
timestamp: November 02, 2015, 04:01:44 am
content: Hello there,I got myself a used HP 3478a meter and sadly the amps-fuse holder is missing, so I want to modify the front panel to fit another fuse-holder mechanism.Unfortunately I have issues removing the front panel.Maybe somebody else here already solved this problem?Even if I would get past the rackmount studs that protrude into the plastic on the sides, there is still the pressfit connector that connects the main pcb with the front-panel pcb.I attached a screenshot of the service manual. MP6 is the part in question. It is screwed onto both pcbs and all the screws are somehow covered or not accessible without removing the front panel.My english isn't that good so I hope you understand what I mean.Greetingsaudiocrush

author: tec5c
author_rank: Frequent Contributor
timestamp: November 02, 2015, 04:05:53 am
content: Do you mean you can't separate the front panel pcb/display module from the chassis?

author: audiocrush
author_rank: Newbie
timestamp: November 02, 2015, 04:08:51 am
content: Yes.

author: tec5c
author_rank: Frequent Contributor
timestamp: November 02, 2015, 04:18:37 am
content: IIRC there is the some trouble with the 3457A, though it's not impossible.I believe the front panel detaches from the bezel... From what I recall, the disassembly is somewhat buried in the service manual.

author: audiocrush
author_rank: Newbie
timestamp: November 02, 2015, 04:38:03 am
content: Ah thank you,It's written on page 64.Both boards including the front panel have to be pushed through the front bezel as an assembly.That sounds quite annoying but I guess I have to give it a try tonight.Thank you for your help!

author: audiocrush
author_rank: Newbie
timestamp: November 04, 2015, 07:42:03 pm
content: Yay I managed to open it and just upgraded the thing.I quite like the resultI still had some nice Hirschmann binding posts laying around.And I really don't care that much about a replacable fuse, so I just soldered one in series with the new amps binding post.
HP 6632 current sinking performance - Page 1
Forum section: electronics / testgear

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 04, 2015, 12:02:46 pm
content: HiI have been needing a current load for smaller currents. Just something that does 10s of mA well. I have something that does several Amps fine. I was wondering how good these units are at lower currents? Anybody used one at lower currents?Trev

author: AndyC_772
author_rank: Super Contributor
timestamp: November 04, 2015, 12:07:07 pm
content: I have a few 6632B's. If you're relying on it to set the load current, you may find the steps a tad coarse, depending on just how precise you need it to be.If you have a specific requirement I may be able to do a quick test and let you know how it performs.

author: dexters_lab
author_rank: Unknown
timestamp: November 04, 2015, 01:18:14 pm
content: the current control steps in 1.3mA increments so depending how this falls you might end up at 49.3mA then the next step is 50.6mA for examplealso the minimum you can sink seems to be around 24mA

author: trevwhite
author_rank: Frequent Contributor
timestamp: November 04, 2015, 05:06:04 pm
content: Thanks for the replies.I watched a YouTube video on them and they sound pretty loud? Maybe it was just the mic auto adjusting because it was really really loud.The resolution sounds good and they are not much money for what you get.

author: KJDS
author_rank: Super Contributor
timestamp: November 04, 2015, 05:14:56 pm
content: They are fairly loud, and louder when doing some real work. I've got both A and B in stock, PM me if you're interested.

author: mtdoc
author_rank: Super Contributor
timestamp: November 04, 2015, 05:24:59 pm
content: Easy fix to change out the fan to a quieter, temperature controlled one. Seehere. There's some question about the optimal position of the temperature sensor - but mine has worked fine.
Dave.. or anyone test this? > BK Precision 600 Battery Capacity Analyzer - Page 1
Forum section: electronics / testgear

author: Steve Wayne
author_rank: Contributor
timestamp: November 04, 2015, 06:16:27 am
content: Dave, or anyone else who has the time, or knows of a test? I would really like to see a test and tear-down of this BK Precision 600 Battery Capacity Analyzer...http://www.bkprecision.com/products/electrical-battery-testers/601B-6v-12v-sla-battery-capacity-analyzer.html
YIHUA 8508D+ STATION SOLD IN AUSTRALIA $109 240VAC EX EBAY - Page 1
Forum section: electronics / testgear

author: markhead
author_rank: Newbie
timestamp: November 04, 2015, 01:22:32 am
content: Just received this unit- impressed. No loose wires---earthed correctly-active link correct way round- air hoses fine- this unit is QUIET-and while I have not made air flow test yet it has excellent air flow and temp control seems fine--even has an operating led that lights up when current is flowing to the gun if you wish to know how hot the gun tip is [but it is a bit dim for my old eyes so will change it for a brighter led since I am a bit old to do the fingertouch tip test these days [there is also a check button on unit to test temp as well] -and also a mag switch coupled in with it on handset too--seems to work but early days yet so my trigger cutter has not been used- yet. I am a Hakko fan and have a few of these but spare parts for 801 and 802 models is getting interesting so started exploring for a cheaper substitute that does not have the usual 2/3 way overheads such as soldering iron bs. included etc etc - all I wanted was an accurately delivered system that delivers air and heat without hassles similar to 801 Hakko--and this is it. All the Hakko 801 style airflow and temp control is there -- Cheap-- easily obtainable spares-doesn't weigh a ton and well built. Carmates sell this but their label for it is 858d unless they have changed it by now since I told them about it--ok folk to deal with in my experience and no, I don't work for them and have no affiliations political or otherwise. And price? $109.95 Australian. Delivery? FREE in Aust.

author: crispy_tofu
author_rank: Super Contributor
timestamp: November 04, 2015, 03:06:27 am
content: That's good to hear.Might get one of these sometime in the future...
Oldschool 1972 Polish oscilloscope - eBay score - Page 1
Forum section: electronics / testgear

author: wojteks
author_rank: Newbie
timestamp: November 03, 2015, 11:06:36 pm
content: Check out what I scored recently on the Polish version of eBay!A 1972 vintage ZDZ Mini 4 scope. Definitely small and rugged enough to throw into your toolbox! Powered by 4 tubes, a handful of resistors and caps.And it works! Triggering seems to work pretty much automatically.Came with this.. "probe"..Some controls..Number plate..And the insides:The caps even have the retail price printed on the body! 40.50 PLNThat's a bit "How ya doin"Thanks and greetings to all!

author: lowimpedance
author_rank: Super Contributor
timestamp: November 03, 2015, 11:14:13 pm
content: And the probe too !, nice to see these oldies not ending in landfill.Thanks for the pics.
DER DE-5000 - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: November 02, 2015, 09:57:20 pm
content: So I finally bit the bullet and bought one.Compared to the readings of an HP 4275A, it's pretty much dead on.Not sure why I waited so long to buy one, yet, built several ESR meters that just aren't cutting it.

author: Lightages
author_rank: Unknown
timestamp: November 02, 2015, 10:02:45 pm
content: Yup, it seems to be the best bang for the buck for now.

author: Deathwish
author_rank: Unknown
timestamp: November 02, 2015, 10:19:17 pm
content: compared it too the UT-612 ?

author: Lightages
author_rank: Unknown
timestamp: November 02, 2015, 11:15:07 pm
content: Yeah, I would say even compared to the UT-612. The DER EE DE-5000 has true four wire measurement available. To me that trumps any of the benefits of the UT-612.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: November 03, 2015, 01:23:03 am
content: Quote from: Lightages on November 02, 2015, 11:15:07 pmOut of curiosity, what benefits does the UT-612 have considering they use the same chipset? Not to be argumentative, I am legitimately curious.

author: Lightages
author_rank: Unknown
timestamp: November 03, 2015, 03:32:13 am
content: Quote from: PedroDaGr8 on November 03, 2015, 01:23:03 amActually I don't know of the actual benefits of the UT-612. I only know that it doesn't do 4 wire measurements.

author: dav
author_rank: Regular Contributor
timestamp: November 03, 2015, 06:17:50 pm
content: And what about compared to the Tonghui TH2822A? (similar price to a bundled DE5000, 4 wire measurement support and hackable to 100kHz).(I opened a thread about TH2822A vs DE5000, but nobody replied)

author: Lightages
author_rank: Unknown
timestamp: November 03, 2015, 06:47:36 pm
content: Hmmm, I don't see them as close to the same price. You can get the DER EE DE-5000 with the normal "Kevlin" clips, the Kevlin tweezers, and the the guard lead for around $120 shipped. The TH2822 with a USB cable and the power adapter (no Kelvin probes) is at least $180 shipped.
Owen AG1022 Wave Form editing - Page 1
Forum section: electronics / testgear

author: jfgilbert
author_rank: Newbie
timestamp: November 03, 2015, 02:31:27 am
content: Amazon recently had the AG1022 for $199 and I happened to be looking for an Arb generator, so I went ahead. The machine is not bad at all and 2 channels at 25MHz (well, 10MHz other than sine wave) would be hard to find at that price. The problem, as someone pointed out, is that the software to edit the wave forms is horrendous. Apparently, both the box and the PC software do an equivalent hostile job - I have only tried the box itself because I do not have a windows box around, but did not want to spend another minute with it.I decided to figure out the format of the wave files and make them editable. It was pretty straightforward, so I wrote a couple of simple programs to convert between the internal format and simple text files that can be edited or manipulated with a spreadsheet.If anybody is interested, the code, some instructions, and an example are available on github at:https://github.com/Jfgilbert/AG1022-Wave-Conversion.gitThe programs are PHP, so they will run from the command line if you have the interpreter installed. I have not tested on a windows box, but there is no reason why it would not work. They are very simple - no GUI, nothing fancy, just simple commands. I have also done limited testing, let me know if you run int problems and I'll try to address them.Cheers.
HP6012A 1kW PSU just keeps going... - Page 1
Forum section: electronics / testgear

author: nctnico
author_rank: Super Contributor
timestamp: November 02, 2015, 09:54:48 pm
content: I was doing some testing today and I suddenly realised something odd. I was loading the PSU with 27A when set to 50V. That is 1350W while it is rated for 1kW (1200W between 30V and 40V). It makes me wonder whether it has any output voltage dependant current limiting or just shuts down when overheating.
Voltkraft, Conrad DSO/MSO - Page 1
Forum section: electronics / testgear

author: MT
author_rank: Super Contributor
timestamp: November 02, 2015, 08:20:50 pm
content: Who is the manufacturer behind Voltkraft brand? Rigol?http://www.conrad.com/ce/en/product/1361294/VOLTCRAFT-DSO-1074D-4-channel-oscilloscope-Digital-Storage-oscilloscope-Bandwidth-70-MHz?ref=searchDetail

author: Marchello
author_rank: Contributor
timestamp: November 02, 2015, 08:25:14 pm
content: I think -http://www.gwinstek.com/en-US/products/Oscilloscopes/Digital_Storage_Oscilloscopes/GDS-1000B

author: commie
author_rank: Frequent Contributor
timestamp: November 02, 2015, 08:40:59 pm
content: That is made by GW-Instek (1000 series) and rebadged Voltcraft.They are good scopes I have the 2202E version.http://www.aspen-instek.com/oscilloscopes/digital-oscilloscopes/70-200/4-channel
Need manual or schematic for ESI 230A Resistance Bridge - Page 1
Forum section: electronics / testgear

author: Stray Electron
author_rank: Super Contributor
timestamp: November 09, 2015, 07:15:40 pm
content: I picked up one of these few days ago at an antique radio meet for $1. It was made by Electro Scientific Industries of Portland, Oregon. I found two patent dates for these, one was from 1957 and the other was 1962! It has four digit knobs that control resistance plus a fifth knob that selects one of eleven ranges ranging from fractions (1/100s) of a milliOhm to 12 G Ohms but I can't figure out how the range multiplier works. Does anyone have a manual or a schematic for it?

author: Vgkid
author_rank: Super Contributor
timestamp: November 09, 2015, 07:37:29 pm
content: Try downloading the manual for the ESI242, i believe that it has a breakdown of how to use its sub assemblies. This looks like a wheatstone bridge.
Which used Fluke's to avoid ? - Page 1
Forum section: electronics / testgear

author: Rolo
author_rank: Regular Contributor
timestamp: October 30, 2015, 04:38:24 pm
content: I know there are some series that have a high change of getting the faded display's. Is there a quick guide/list to see wich models are to avoid?

author: rsjsouza
author_rank: Super Contributor
timestamp: October 30, 2015, 04:49:50 pm
content: Excavatoree has excellent buying guides on eBay for Fluke meters.http://www.ebay.com/gds/Fluke-Meters-Main-Read-First-/10000000007231862/g.html

author: retiredcaps
author_rank: Super Contributor
timestamp: October 30, 2015, 05:09:24 pm
content: Used/abused Fluke meters can potentially have a lot of problems. Modemhead has documented a lot of repairs so you have an idea what to expect.http://mrmodemhead.com/blog/all-posts/

author: Rolo
author_rank: Regular Contributor
timestamp: October 30, 2015, 07:39:18 pm
content: Thanks for the links ! The provide a lot of usefull informtion.

author: wiss
author_rank: Frequent Contributor
timestamp: October 30, 2015, 08:48:36 pm
content: Quote from: Rolo on October 30, 2015, 04:38:24 pmThe early LCD-ones, 8010, 8012, 8020, 8050, 8060, 8062 for the display, 80 {50,60,62} are great meters and you can not get a replacement display, 80 {10,12,20} a bit boring but you can supposedly hack in a modern lcd

author: retiredcaps
author_rank: Super Contributor
timestamp: October 30, 2015, 09:53:11 pm
content: By the way, not all Fluke handheld multimeter models are equal in terms of the touted "legendary" features.Some don't have touch hold/auto hold, some have slow continuity speeds, some have poor battery life, etc.

author: Rolo
author_rank: Regular Contributor
timestamp: October 31, 2015, 11:10:50 am
content: Quote from: retiredcaps on October 30, 2015, 09:53:11 pmFully agree with that, but these are properties of a specific type/model that you can accept or not when buying.

author: krivx
author_rank: Frequent Contributor
timestamp: October 31, 2015, 11:31:16 am
content: Quote from: wiss on October 30, 2015, 08:48:36 pmI have 2 original Fluke 87s. Replacement LCDs sell for as much as a complete meter!
Hantek 6022BE Windows 7 drivers? - Page 1
Forum section: electronics / testgear

author: usao
author_rank: Newbie
timestamp: October 30, 2015, 06:39:42 am
content: Im not able to get the Hantek 6022BE to install drivers on Windows 7.I try the driver install from the driver download, but Windows just sais it's un-recognized.Any suggestions on how to get a working driver for Windows 7?

author: vk6zgo
author_rank: Super Contributor
timestamp: October 30, 2015, 12:27:44 pm
content: Search for Hantek 6022BE on this forum---there is quite a lot of information in several threads.

author: usao
author_rank: Newbie
timestamp: October 30, 2015, 01:02:48 pm
content: Quote from: blueskull on October 30, 2015, 07:31:17 amThey supplied a dual USB cable (with both black and red ends). I plugged both in to my windows 7 laptop, and it does recognize a device under the windows device manager.However, all attempts to load a device driver for this "unknown" device have failed. It doesn't recognize the drive folder as containing any valid drivers.

author: John_ITIC
author_rank: Frequent Contributor
timestamp: October 30, 2015, 09:54:35 pm
content: If windows says the device is "unrecognized" then it means the device did not respond with its vendor ID and Device ID when requested by the host. Check in the Windows device manager; if the VID/PID is reported as 0000/0000 or the like then there is something wrong with your device or the cable is bad. If your device works with another PC then check the voltage coming out of the non-working PCs USB port; it may be lower than on the working PC. The USB standard says that the USB voltage could be much lower than 5.0V and still be valid; perhaps your device doesn't handle the lower bus voltage properly.If everything else fails; buy a USB Protocol Analyzer. It will tell you exactly what the cause of the failed enumeration is.

author: OldSchoolTechCorner
author_rank: Frequent Contributor
timestamp: October 30, 2015, 11:11:07 pm
content: Quote from: usao on October 30, 2015, 01:02:48 pmYou more likely need a power hub and power supply to power hub, maybe not as big as the one under my bench. But laptops generally don't meet the 500ma per port required to power it.
Difference between Tektronix TG501 early version, later version and TG501A - Page 1
Forum section: electronics / testgear

author: mskobier
author_rank: Regular Contributor
timestamp: July 10, 2015, 05:56:55 pm
content: All,I have been working on getting my 2400 series scope calibration equipment together and operational. I have acquired two TG501 modules, the first one has the small led display window (early) and the second has the large red plastic cover over the display. The first one is a B034xxx and the second is a B049xxx. I have a service manual for theTG501, but is appears to be for the earlier version. Other than cosmetics, can anyone tell me the differences between these models? In examining the circuit boards, the first thing I noticed was the absence of the adjustment capacitor C102 for the 1mhz time reference adjustment on the later version. Other than that, the circuit boards are almost identical, with the circuit board numbers being version 02 versus 03. I have also seen some manuals for sale for the TG501A, but have not been able to find a picture of the A model. Is the version with the large red plastic piece the A version?The later version appears to work properly and the earlier version works, but the marker frequency is off by a factor of 10 low. So when setting the unit to 1 micro sec (1mhz), the actual output frequency is 0.1mhz or 100khz. At this point, I do not know if the knob position is not installed properly, or there is a problem with one of the multiplier/divider circuits. I'll get it figured out eventually.Mitch

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: October 30, 2015, 07:01:27 pm
content: Hi,Also have both versions here. I have been working on the early version. Replaced about 90%, or more, of the 7400 series socketed IC's (the later version only has a few sockets) there was a major problem. All is fine now, EXCEPT, one of the 2 BCD to 7 segment Display Driver ICs, are bad. Problem is they chose a Signetics 8T06 (part of the 8000 series Signetics line) as their driver IC. Totally non-standard pin out. Unlike the DM44 DVM's (of the same era) that used 4511 type pin-out. Very hard, and expensive to source the 8T06. I may try to dead bug a 4511 and rewire to make it work. While I trouble shot all the dead 7400 series, I found some differences from the schematic. So the early series are different, for sure.
TL866cs minipro config word setting - Page 1
Forum section: electronics / testgear

author: steve207a
author_rank: Contributor
timestamp: October 30, 2015, 02:48:03 pm
content: Just got a tl866cs and tried to set config bits for a pic16f684 the minipro has a config screen with blank squares you can tick them but be warned ticking the box actually means 0 an unticked box means 1so when using pickit 3 and its software you set the bits to 1 as required but with a tl866 you leave blank the set bits and tick the 0 bits if that makes any sence ...example 16f68411 10 9 8 7 6 5 4 3 2 1 0 config bits0 0 0 0 1 1 0 0 0 1 0 0 pickit 3T T T T B B T T T B T T tl866cs T=Tick B=left blankin both programmers return config word 30C4so if you use a different programmer before watch out for the way you set the config bits in a tl866csAlso does anyone know what the Calibration word disable tick box is for ie what use is itps if you have trouble trying to program ic make surecheck device id is not tickedas sometimes this workshope this helps others using this neat little machinesteve
Hantek DSO5102B: can't zoom on pre-trigger data - Page 1
Forum section: electronics / testgear

author: mich41
author_rank: Regular Contributor
timestamp: October 29, 2015, 12:36:22 pm
content: Hi all.I can't find a way to examine pre-trigger data in high magnification. What I'm doing now is stopping the scope with RUN/STOP, centering on the interesting point using the HORIZONTAL POSITION knob and zooming in with SEC/DIV. However, when I try to zoom near the beginning of the recorded trace, the screen jumps towards the trigger point and refuses to go back. The more I zoom, the closer it goes towards the trigger point - at highest mag almost none of the pre-trigger part can seen. Nothing like this happens when examining the post-trigger part.Am I doing something wrong? Or is it a stupid firmware bug? I cannot see how something like that should be impossible in principle.I'm running fw 130814, which seems to be the last version supported by my hw1005 unit. Is this fixed in later versions?BTW, do all of these scopes lockup and hang every few hours? Maybe only the old hw versions? I'm asking these questions because I bought this unit recently and I'm considering returning it if newer version are known not to have such issues.

author: dom0
author_rank: Super Contributor
timestamp: October 29, 2015, 01:32:30 pm
content: Quote from: mich41 on October 29, 2015, 12:36:22 pmUh yeah, that happens to various degrees with many sample rate + memory depth combinations. I'm not aware of any fix/workaround.Quote from: mich41 on October 29, 2015, 12:36:22 pmNormal for these scopes. With some settings they crash more often, with others less often. FFT, 1M memory and frequent USB saving seems to increase the chance of a crash.

author: mich41
author_rank: Regular Contributor
timestamp: October 29, 2015, 03:49:15 pm
content: Well, that's bad as it kinda breaks this whole pre-trigger feature. I wonder if it can be worked around using the PC software, maybe I'll find a moment to boot my Windows machine and play with it.Another stupid bug I encountered is that in "normal triggering mode" (or with "single seq") and in absence of triggering events, Force Trigger often causes a narrow dip to appear on both channels at -20us and/or -100ns, especially with 40k or more memory. Looks best at 4us/div. I guess this is normal too?
cosmic microwave background radiation - Page 1
Forum section: electronics / testgear

author: analogNewbie
author_rank: Regular Contributor
timestamp: October 29, 2015, 10:11:52 am
content: hiI am wondering if one can observe the 4080MHz background radiation with a spectrum analyzer and a sattlite antenna?What kind of LNA should I put in between the SA and antenna?

author: Berni
author_rank: Super Contributor
timestamp: October 29, 2015, 02:33:11 pm
content: You probably can with a good LNA in a area with not a ton of radio noise, but the thing is you wont really see much apart from some noise. Don't think its easy to build a setup precise enough to scan across the sky and make a map of the tiny differences.
DER DE-5000 Power Supply Connector - Page 1
Forum section: electronics / testgear

author: Fat
author_rank: Regular Contributor
timestamp: October 12, 2015, 10:40:55 pm
content: I just got a DER EE DE-5000 out of Japan. Very nice LCR meter, but it does like to eat the 9 volt batteries. I have a dozen 9 volt switching AC adapters around, but I can't seem to find the correct jack to fit it. Does anyone know what size male connector it takes?Thanks,Fat

author: crispy_tofu
author_rank: Super Contributor
timestamp: October 13, 2015, 12:19:57 am
content: http://akizukidenshi.com/catalog/g/gM-06709/This link shows that the length of the barrel is 12mm, with centre positive.

author: PedroDaGr8
author_rank: Super Contributor
timestamp: October 13, 2015, 12:23:44 am
content: According toRobrenz hereQuote

author: Fat
author_rank: Regular Contributor
timestamp: October 13, 2015, 04:33:04 am
content: Thanks!

author: Fat
author_rank: Regular Contributor
timestamp: October 28, 2015, 08:16:24 pm
content: Short update: I ordered a barrel jack and used a 9 volt switching power supply I had on hand and it works well. The jack came from:http://www.ebay.com/itm/2-pcs-DC-Power-Barrel-Coaxial-Connector-1-3mm-pin-3-5mm-outside-diameter-/252127274303?Hard to find the correct length, but this one works!Fat
DS1052E ver 00.04.02 SP1 - Page 1
Forum section: electronics / testgear

author: g4ztd
author_rank: Newbie
timestamp: October 28, 2015, 02:02:52 am
content: I just brought a DS1052E ver 00.04.02 SP1 brought it Sept 2015 is it possible to make this one a 100mhz scope because it does not seem to downgrade (My mate tried to do it for me). If it posible could you let me know how to do it please CheersPSI have never done anything like this before so please if you reply explain clearlyThanks in advance folks
[Q] Keysight DSO1072B - change exported image resolution? - Page 1
Forum section: electronics / testgear

author: AlxDroidDev
author_rank: Frequent Contributor
timestamp: October 27, 2015, 05:37:45 pm
content: Recently I bought a Keysight DSO1072B, which seems to be a rebranded Rigol of the same model number.To my disappointment, the exported image file on the flash drive is only 320x240 (the same resolution of its LCD display). It doesn't matter if I save on PNG or BMP, the size is the same.Even if I use the PC software IntuiLink, the image size is the same (but with inverted colors, which makes it even worse).Is there any way to change the resolution of the exported image?The only thing that makes me not totally regret this purchase is the fact that I paid only US$ 260 for it (brand new, from Farnel Newark Brazil).

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: October 27, 2015, 05:40:24 pm
content: its literally is a 'screenshot' of the 320x240 screen. what image size do you expect? a bigger image wont give you more data etc.

author: AlxDroidDev
author_rank: Frequent Contributor
timestamp: October 27, 2015, 07:12:40 pm
content: Quote from: BloodyCactus on October 27, 2015, 05:40:24 pmMy primary goal was to share the images on a blog article where I compare smartphone-based signal generators. I am writing a blog post comparing a few Android apps, their capabilities and, of course, their waveforms.On a second article, I am teaching how to use an OpAmp (LM324) to amplify the signal from the smartphone app and bring it to a 0-5V range, keeping the same waveform, but making it usable on an Arduino, for example.I both cases, images from the oscilloscope adds value to the article.Thanks anyway. I hoped there could be a hack or configuration I might have missed that would allow me to have a better image.

author: BloodyCactus
author_rank: Frequent Contributor
timestamp: October 28, 2015, 01:20:39 am
content: you can always just 3x scale the image or so. wont be the sharpest knife in the drawer but it will be legible.
Rohde & Schwarz EX-IQ-BOX - Page 1
Forum section: electronics / testgear

author: tonalt
author_rank: Newbie
timestamp: October 13, 2015, 06:52:17 pm
content: So I ended up having several units of these from auction, and now I have finally time to take closer look what these really are. My main motivation is to sell them, but first I need to understand what do I have here and does them work."The R&S®EX-IQ-Box is a digital interface module that provides flexible digital baseband inputs or outputs for signal generators, signal analyzers and communications testers from Rohde & Schwarz. The main application field of this device is the conversion of digital I/Q signals of R&S instruments into user defined or standardized digital signal formats and vice versa."It seems that these units came with:EX-IQ-BOX itselfPower supplyLVDS cableBreakout boardsSoftware CDFrom these, I only have EX-IQ-BOX itself, suitable power supply and DigIConf software which is free for download from R&S website.I plugged in the units to PC, and Windows 7 recognizes new USB device. But it seems that only for bigger model 1409.5505K04 Windows can automatically & successfully install driver. After that DigIConf also recognizes the unit.But for the smaller model 1409.5505.02, the USB device is recognized, but Windows is unable to install the driver.So my questions are:- Is there driver available somewhere also for model 1409.5505.02 ? I cannot find it from R&S website.- Can I verify that the units are working by just plugging them into PC and using DigIConf, or do I need to have also LVDS cable and breakout board, and connect the unit to other R&S device like signal generator?- If the answer to the last option is yes, where I can find this cable and breakout board for reasonable price?

author: tonalt
author_rank: Newbie
timestamp: October 25, 2015, 08:08:21 am
content: Anyone?

author: tmbinc
author_rank: Frequent Contributor
timestamp: October 26, 2015, 12:48:15 pm
content: Can you provide a photo of the PCB?I'd be curious what's actually in there. Seems they are mostly a USB/LAN interface streaming to a customizable "digital I/Q" stream.

author: crispy_tofu
author_rank: Super Contributor
timestamp: October 26, 2015, 10:53:05 pm
content: Quote from: tmbinc on October 26, 2015, 12:48:15 pmYes please - tear it apaaaaaart!
Tektronix 7A29P works with 7904? - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: October 26, 2015, 10:43:00 pm
content: Does anyone with a 7904 know if the 7A29P will work with the 7904? I'm petty sure the 7A29 will work with the 7904, but I haven't found any confirmation yet on the 7A29P. Thanks

author: miguelvp
author_rank: Super Contributor
timestamp: October 27, 2015, 12:03:25 am
content: According to this:http://w140.com/tekwiki/wiki/7A29The 7A29P is intended for use with the 7000 series digitizers, although they don't say it wont work with the 7000 series scopes, but it's different than the 7A29.So I guess it depends what they mean by "intended", maybe you just can't use the digitally programmable gain.

author: edavid
author_rank: Super Contributor
timestamp: October 27, 2015, 12:06:19 am
content: Quote from: Electro Fan on October 26, 2015, 10:43:00 pmThe 7A29P will work in a standard mainframe like the 7904, but depending on what other plugins you have installed, it may overload the +5V supply.

author: MadTux
author_rank: Frequent Contributor
timestamp: October 27, 2015, 12:33:41 am
content: Should probably just work fine.AFAIK only difference is pushbutton with relay attenuator that is also remotely programmable instead of mechanical turn knob attenuator.There are more such funny plugins like 7A16P, which according to this site, just runs fine in a Tek 7633:http://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_7000_series_amplifier/7A16P.html

author: Electro Fan
author_rank: Super Contributor
timestamp: October 27, 2015, 01:49:30 am
content: Quote from: edavid on October 27, 2015, 12:06:19 amRight - this is a concern I've heard - overloading the supply doesn't seem to be a good gamble. Might have to stick with a 7A29. Thanks
Quality test leads - who/what/what/etc - Page 1
Forum section: electronics / testgear

author: abaxas
author_rank: Regular Contributor
timestamp: September 27, 2015, 12:16:34 pm
content: Hi all,Just bought a new multimeter and the test leads are a bit 'meh'. So thought I'd ask the question, what do I replace them with. I'll need a set of standard probes with nice sharp points but also some with crock clip ends. Nice and bendy but also hardwearing please!So I'll throw it out to the floor and hopefully people will have some recommendations. I'm UK based but if something needs to be imported and it's worth the wait/money, happy to spend it on making my life more pleasant.Thanksabaxas

author: bitslice
author_rank: Frequent Contributor
timestamp: September 27, 2015, 12:36:56 pm
content: There was some talk of a group buy in this thread?https://www.eevblog.com/forum/buysellwanted/wtb-probe-master-test-leads-for-dmm/Because trying to throw money at them from the UK goes unanswered, I've never met a company so disinterested in trying to sell anything.

author: GreyWoolfe
author_rank: Unknown
timestamp: September 27, 2015, 12:39:00 pm
content: http://www.ebay.com/itm/171162377470?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AITFrankie is a forum member here and pleasant to deal with. I use these on a Fluke 27/FM and I like them.

author: CrashO
author_rank: Unknown
timestamp: September 27, 2015, 01:02:11 pm
content: Thumbs for the Brymen leads from Franky from me tooThey feel great and work a treat.If you contact him onthe forumyou can usually get a 5% of from the ebay price because of the eBay commission.

author: wagon
author_rank: Frequent Contributor
timestamp: September 27, 2015, 01:30:26 pm
content: I got one of these (or similar) Keysight lead sets. Good quality IMO.http://au.element14.com/keysight-technologies/u8201a/combo-test-lead-kit/dp/1714842Should be able to get it in the UK from Farnell.

author: samofab
author_rank: Regular Contributor
timestamp: September 27, 2015, 01:42:42 pm
content: I bought shrouded test leads from Frankie and mated them to Agilent probe. I'm extremely satisfied with their "feel" and flexibility.

author: knotlogic
author_rank: Regular Contributor
timestamp: September 27, 2015, 01:45:37 pm
content: Seems like a popular topic recently...https://www.eevblog.com/forum/testgear/finest-possible-multimeter-test-leads/https://www.eevblog.com/forum/testgear/where-to-get-good-quality-multimeter-probes/There's been a lot of good words said about the Brymen leads from Frankie (see the post above). Probably the easiest to acquire in the UK too. But I didn't get that, instead I picked up some Probemasters and I quite like them. They have a "standard" type which allows for screw on options, a modular system and a "pogo-pin" type for fine work.The other, pricier, option are the Fluke TL175 or TL175E. Those don't come with a croc clip option that I know of.

author: abaxas
author_rank: Regular Contributor
timestamp: October 26, 2015, 09:26:33 pm
content: Thanks to all who repied.Frankie/y's bryman leads turned up today. Super bendy, nice sharp points and the perfect length.Exactly what I needed.
EDC/Krohn-Hite MV216A DC Voltage Standard Teardown and Tempco Measurement - Page 1
Forum section: electronics / testgear

author: AlphZeta
author_rank: Regular Contributor
timestamp: October 25, 2015, 11:55:59 pm
content: In this video, I did a teardown of the Electronic Development Corporation's (acquired by Krohn-Hite) MV216A battery/external powred DC voltage standard. MV216A is very similar to the MV106 Dave reviewed a while back and the main difference is the battery/external power option.I also measured the actual temperature coefficient of the reference Zener 1N829A.Here is the link to my blog page:http://www.kerrywong.com/2015/10/25/edckrohn-hite-mv216a-dc-voltage-standard-teardown-and-tempco-measurement/

author: nidlaX
author_rank: Frequent Contributor
timestamp: October 25, 2015, 11:58:57 pm
content: Nice video and write up!

author: AlphZeta
author_rank: Regular Contributor
timestamp: October 26, 2015, 12:27:25 am
content: Thanks @nidlaX!

author: Vgkid
author_rank: Super Contributor
timestamp: October 26, 2015, 05:40:23 am
content: Thanks for the video, good job on finding the zeners tempco.

author: montemcguire
author_rank: Regular Contributor
timestamp: October 26, 2015, 11:00:54 am
content: Great video, and great analysis! It always makes me happy to see well designed equipment, but also an analysis by someone who knows 'what they're looking at'. Thanks again!
Understanding the specs of Rogowski coils - Page 1
Forum section: electronics / testgear

author: opusensemble
author_rank: Contributor
timestamp: October 27, 2015, 06:26:13 am
content: I've been trying to understand the apparent industry standards for Rogowski coils but everywhere I look the specs look utterly confusing to me.We know that the voltage generated in the coil is proportional to the time derivative of the current flowing in the conductor (dI/dt), similarly to the current induced in a loop, like attached image shows.What I would like to confirm is that the typical rated voltage of 333mV of a rogowski coil + integrator, corresponds to the integrator output, and not the voltage on the coil terminals.Here's 2 examples were the 333mV spec appears:Example 1:http://www.aimdynamics.com/RCS-1800-Flexible-Current-Sensor-333mV-Output-p/rcs-1800.htmhttp://www.aimdynamics.com/v/vspfiles/techspecs/RCS-1800.pdfExample 2:http://www.alibaba.com/product-detail/333mV-output-HYC-S9-Flexible-Rogowski_1952085586.html?spm=a2700.7724838.30.68.J9NpfBI was thinking the 333mV was the output of the integrator for the rated current, until I saw this video, that seems to indicate that the 333mV is the output of the coilThe specs for the coil he's using are here:http://www.aimdynamics.com/RCT-1800-000-Flexible-Current-Sensor-p/rct-1800-000-a.htmhttp://www.aimdynamics.com/v/vspfiles/techspecs/RCT-1800-000.pdfThe video author makes a linear correspondence between the rating of a 70mV/1000A rated coil to the 333mV spec typically used in these coils.This got me extremely confused. I would expect the 333mV was the output of the integrator, not it's derivative (the coil output).Really, really, really confusing!What I'm assuming is the following:1) The specs on Rogowski coils assume sine wave inputs.2) In the rating of 70mV/1000A 60Hz the 70mV is AC RMS voltage3) The 333mV is an AC RMS voltage rating and can refer to either the coil output or the integrator output.4) In case the 333mV rating refers to the integrator output, a phase shift of 180 degree should exist ( as cos(x) is derivative of sin(x) )5) The integrator can thus output voltages that are multiples of the rated current corresponding 333mV*sqrt(2), up to near its supply voltage.Do you thing my assumptions so far make sense? Or is there any other possible interpretation?
Fluke 45 - Aborted calibration now gives Error 7:EEPROM calibration data corrupt - Page 1
Forum section: electronics / testgear

author: sab
author_rank: Contributor
timestamp: October 25, 2015, 06:55:24 pm
content: So I (clearly ill-advisedly) attempted a calibration of my Fluke 45 which was working perfectly. I exited calibration mode by pressing the calibration button on realizing it needed precision voltages that I didn't have. Now, on power on, it gives me an Error 7 which the service manual says is,"EEPROM calibration data corrupted".I thought this was odd because the service manual says you can exit calibration mode without any side effects, i.e., "If calibration of any function is discontinued prior to completion, no changes are made to nonvolatile calibration memory for that function."Any ideas apart from getting the unit professionally re-calibrated? I don't have all the equipment to calibrate it myself.Thanks,Sanjay
LEM CKSR teardown - Page 1
Forum section: electronics / testgear

author: plesa
author_rank: Frequent Contributor
timestamp: October 25, 2015, 06:54:58 pm
content: As Dave said, don turn it on, take it apart.Current sensing is closed lood described in datasheet of used IChttp://www.ti.com/lit/ds/symlink/drv401.pdfand datasheet provided by LEMhttp://www.lem.com/docs/products/cksr%20serie.pdfAssembly can be reused by some homemade clamp probe I suppose.Transducers are quite cheap about 20 USD.
Agilent U1273 Firmware Fail - Page 1
Forum section: electronics / testgear

author: rdubelectronic
author_rank: Newbie
timestamp: October 24, 2015, 11:22:16 pm
content: I purchaced a second hand Agilent U1273A, Actually a very nice DMM.I did the firmware upgrade. Result: Meter DEAD. Now only shows: D....Tricks cannot be found and reply from Agilent on someone else who did the same update: BERBeyond Economic repairDO NOT EXECUTE THIS UPDATE !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!A very very disapointing behaviour for such expensive equipment, never again Agilent
RFL 829M Calibrator AC, DC and Ohm  - Page 1
Forum section: electronics / testgear

author: dr equipment
author_rank: Newbie
timestamp: November 14, 2014, 12:00:14 pm
content: Hi,I bought a RFL 829M AC, DC, Ohm Calibrator but it not working. It power on, I change the voltage, but I turn on the output it show "- OL -" and turn of the output.I need of the manual, service or help.Any information is welcome.Thank you

author: MateKrisz
author_rank: Regular Contributor
timestamp: October 23, 2015, 12:00:50 pm
content: Hi,I have a RFL 829M calibrator, I maybe can help you.The -OL- error message show in A mode, and you not connect any Amper meter to the calibrator.Regards,Krisztian
Help me understand demodulating with the DSA815 - Page 1
Forum section: electronics / testgear

author: josephny
author_rank: Contributor
timestamp: October 22, 2015, 08:38:59 pm
content: Can someone explain why the following happens:I generator a 400mhz carrier FM modulated with a 1Khz tone and feed it into the DSA715 SAI see the signal displayed.I turn on DEMODULATE, plug in a headset and I hear the tone go on and then off and repeater (a pulse).I then tuned the SA to a local FM broadcast, did the same thing and heard the broadcast station in the same way (1/2 second on, 1/2 second off).I played with "demod time" but it didn't get rid of the on/off pattern.What am I doing wrong?Thank you!

author: TheSteve
author_rank: Unknown
timestamp: October 22, 2015, 09:37:04 pm
content: You're doing nothing wrong, the spectrum analyzer is "sweeping" a single frequency. Even if the frequency isn't changing it is effectively restarting the sweep each time at an interval determined by the "demod time".Moral of the story - a spectrum analyzer isn't a standard receiver.

author: vk6zgo
author_rank: Super Contributor
timestamp: October 23, 2015, 12:59:47 am
content: Quote from: TheSteve on October 22, 2015, 09:37:04 pmUnless it is an old analog HP,which will happily act as a receiver.

author: josephny
author_rank: Contributor
timestamp: October 23, 2015, 01:04:02 am
content: I see!So even at zero span, it's restarting it's measurement at the interval that "demod time" is set to.Thank you so much!

author: Electro Fan
author_rank: Super Contributor
timestamp: October 23, 2015, 05:28:08 am
content: Quote from: vk6zgo on October 23, 2015, 12:59:47 amWhat models would constitute an old analog HP (where is the demarcation in their models between old and new?)

author: George_Race
author_rank: Regular Contributor
timestamp: October 23, 2015, 09:49:23 am
content: Any of the HP 8590 series will give you excellent audio either AM or FM. Just make sure it has option 102, which is the AM/FM demodulator board. No matter what the scan you will hear a constant good signal on AM or FM, and you can do Zero Scan as well with the same results.I had a new DSA815 and sent it back for that exact reason. Also the Rigol front end sensitivity was not anywhere near as good as the HP 8595E that I purchased to replace it. You can purchase one of the 8590 series HP SA's for about the same price, or less than the DSA815.Hope this helps..............