hybridfree/eevblog-posts huggingface dataset:
Rigol MSO1104Z-S Review / Thoughts - Page 1
Forum section: electronics / testgear

author: JoeMuc2013
author_rank: Contributor
timestamp: August 29, 2014, 12:41:54 pm
content: Hi all,Rigol has announced theMSO1104Z-Sfor some time now but it appears hard to find in the market. There is not even a single accurate photo of it anywhere. All images, even in shops offering the MSO1104Z-S, show a MSO1104Z (without -S) at best and often it's a DS1104 instead.Looks like they offer a ton of functionality for a very very reasonable price. 100MHz 4ch oscilloscope (with display intensity grading) + 16ch logic analyzer + 2ch function generator all in one, that is what I've always wanted.However, I would love to see a review and find out where the device has its drawbacks.@Dave: will Rigol send you one of the MSO1074 or MSO1104 units in the near future for review? That would really be greatRegards,Johannes

author: Mark_O
author_rank: Frequent Contributor
timestamp: August 29, 2014, 01:17:35 pm
content: Quote from: JoeMuc2013 on August 29, 2014, 12:41:54 pmThere's plenty of discussion of the MSO1000Z family here, as well as the DS1000Z-S. Just do a search, and put the two together.Re your "4ch oscilloscope (with display intensity grading) + 16ch logic analyzer", be aware that the MSO1000Z is NOT 4-ch scope AND 16-ch LA.For each Group of 8ch LA you enable, you lose one analog channel. So it's only 2-ch analog + 16-ch logic.

author: DocSnyder
author_rank: Contributor
timestamp: August 29, 2014, 05:56:26 pm
content: Thats correct. But the package isn't bad either. But it has to be considered that the scope isn't hackable yet. Maybe they changed private key or the option keys.I would like to help find out but i have no idea where to start because for the DS2000 the procedure is well documented. For the DS1000Z it was no problem until now by using the wonderful keygen.I doubt that some of the real experts will give the special hints. So if you want to buy it be aware of that point.
Rigol DS1102E hack question  - Page 1
Forum section: electronics / testgear

author: Buzz239
author_rank: Contributor
timestamp: August 29, 2014, 01:09:06 pm
content: Is the any reason that the Rigol DS1102E oscilloscope doesn't have hacks ?Perhaps it's a Rigol DS1052E with a 100 MHz hack.TNX Gary

author: tom66
author_rank: Super Contributor
timestamp: August 29, 2014, 02:55:18 pm
content: The only hack is to increase bandwidth from 50 to 100MHz, there are no other options (other than the logic analyser, but that is actual hardware that is missing.)
2 or 3 pin plug for power supply? - Page 1
Forum section: electronics / testgear

author: baoshi
author_rank: Regular Contributor
timestamp: September 03, 2014, 04:55:55 am
content: I bought a 2nd hand KENWOOD PA18-2 linear power supply.This is a properly isolated lab power supply, with separate output +/-/GND terminals. However it is using a 2 pin power plug without ground pin. I have checked the GND terminal is actually connected to the chassis.Is it correct for a power supply? Why not to connect GND?

author: Psi
author_rank: Super Contributor
timestamp: September 03, 2014, 05:11:05 am
content: Maybe someone has changed the plug?It doesn't say EARTH, it says GND. So i guess its technically correct.

author: baoshi
author_rank: Regular Contributor
timestamp: September 03, 2014, 05:34:58 am
content: Quote from: Psi on September 03, 2014, 05:11:05 amI checked and compared with other pictures on the net. The plug seems to be original japanese 2 pin type. Just wonder if it is the standard practice of only using 2 pin plug for power supply?

author: David Hess
author_rank: Super Contributor
timestamp: September 03, 2014, 10:38:08 am
content: All of the similar floating output power supplies I have used included a 3 pin power plug and connected earth ground, chassis ground, and a separate output ground terminal directly together.If there is enough isolation and low enough leakage current then I see no problem with using a 2 pin power plug and forgoing the earth ground connection. In that case, the output ground connection may serve to reduce common mode noise.

author: macboy
author_rank: Super Contributor
timestamp: September 03, 2014, 01:15:35 pm
content: Personally, I would re-wire it with a 3 pin plug, with the chassis grounded. This is the usual way. If the equipment is built to Class II (double insulated) standards, then it would be "safe" to operate without a grounded chassis, but it is still safer yet to have a grounded chassis. Plus, it would be nice to have a true ground reference available when using the supply. Otherwise the ground terminal is useless.

author: DanielS
author_rank: Frequent Contributor
timestamp: September 03, 2014, 01:40:19 pm
content: Quote from: macboy on September 03, 2014, 01:15:35 pmNot completely useless: there may be situations where you want to use circuit-ground instead of earth-ground while still having your +/0/- outputs floating relative to whatever ground is... such as when your power supply and whatever else your circuit is connected to are on different grounds and you want to eliminate ground loops as a variable in your troubleshooting.
MSO2072A-S  - Page 1
Forum section: electronics / testgear

author: milek22
author_rank: Contributor
timestamp: August 28, 2014, 01:42:44 pm
content: HELPPlease urgent help.It seems that he sees the USB BLASTERPonirzej see PHOTOI plugged ALTERA USB BLASTER JTAG - SCOPE.>> What do I do now?>> Type "bfin-gdbproxy.exe --debug bfin --frequency = 5000000"Then start - bfin-elf-gdb.exethen what?day...
HP analog panel meters 1960's - 1980's - Page 1
Forum section: electronics / testgear

author: Joule Thief
author_rank: Regular Contributor
timestamp: August 27, 2014, 11:09:45 am
content: Does anyone know if analog meters used in HP equipment (circa 1960 -1980 power supplies in particular) have an antistatic coating on theoutsideof the meter lens?My question is in regard to removing deep scratches from the meters on a 6227B power supply. The scratching was severe enough to require 1000grit wet-sanding followed by 2000 grit then Novus scratch treatment.I wonder if I'm removing any coating from the lens?Thanks in advance.

author: David Hess
author_rank: Super Contributor
timestamp: August 27, 2014, 03:41:02 pm
content: I doubt it. Why would they include anti-static protection on the cover shield? The meters themselves are not vulnerable to static discharge and the circuits that drive them generally will not be either.

author: robrenz
author_rank: Super Contributor
timestamp: August 27, 2014, 04:58:22 pm
content: Static on analog meter faces is a big deal especially after polishing. It will heavily affect the needle position. The cure is Chemtronics PlasT-N-GlaS It is a static free spray that will give a conductive enough coating that the charge will dissipate. I have had Power Designs analog meters that were pegged at mid scale after polishing that went back to normal after using the PlasT-N-GlaS.

author: Joule Thief
author_rank: Regular Contributor
timestamp: August 27, 2014, 05:25:21 pm
content: The effect is very real. Pre digital readout medical instrumentation suffered from this issue. Many patients were mis-diagnosed due to static build-up on the meter surface deflecting the pointer to indicate abnormal results for "normal" patients or normal range results for unhealthy patients.Many service visits were performed and required only a simple wipedown of the meter cover with IPA to remove static buildup. Of course back then, the meter covers were glass plates and not affected by contact with IPA.

author: Joule Thief
author_rank: Regular Contributor
timestamp: August 27, 2014, 05:33:20 pm
content: Quote from: robrenz on August 27, 2014, 04:58:22 pmI had my benchtop ionizer spewing onto the work area as I was wet sanding the meter faces. Luckily, there was no evidence of any aftermath from the sanding or polishing process.

author: robrenz
author_rank: Super Contributor
timestamp: August 27, 2014, 05:57:03 pm
content: I do the final polish with a felt buff on a flexible shaftIt generates tremendous static charges.

author: David Hess
author_rank: Super Contributor
timestamp: August 27, 2014, 06:11:31 pm
content: I stand corrected.Displacement of the meter do to electrostatic deflection makes sense although I do not think I have ever run across this in real life even with 50 microamp movements.It seems like the solution is to spray the meter face with anti-static spray after polishing or cleaning. I wonder if wiping it down with a anti-static dryer sheet would work.
Problem with MS8240D multimeter - Page 1
Forum section: electronics / testgear

author: sigma
author_rank: Newbie
timestamp: August 25, 2014, 05:05:10 pm
content: Hi,i have a mastech ms8240d multimeter . i bought it about 1 month ago..my problem is when i turn on it for first time , auto power off (APO) flag not appear on LCD and therefore apo timer is not work !if i turn off the multimeter and then turn on it again (restart), it's ok and apo flag will be appeared.another problem is when this problem occurred, sometimes the backlight will be turned on ............the problem is why the apo is not actived for the first start ?!? this is a bug for ES51922 chip ?thanks for your answer,,,,

author: sigma
author_rank: Newbie
timestamp: August 27, 2014, 06:09:00 pm
content: any idea ?

author: Lightages
author_rank: Unknown
timestamp: August 27, 2014, 06:18:04 pm
content: IMHO, Mastech is one of the lower quality meters and I am never surprised when I hear of one of them having a problem. If it is only one month old, take it back for warranty or a refund. If you can I would suggest you consider buying another brand, Uni-Trend, Fluke, Brymen, Digitek, Agilent, Amprobe, BK Precision, Hioki, are just some examples of meters I would trust over ANY Mastech.Sorry you haven't had any help but the answer really is: One month old and not working? Take it back.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 27, 2014, 06:25:56 pm
content: You can try putting in a new fresh battery, cleaning the rotary switch and perhaps cleaning the pcb with IPA (especially around the main IC).

author: ModemHead
author_rank: Frequent Contributor
timestamp: August 27, 2014, 07:28:27 pm
content: I see from a picture that the PC Link is actuated using the backlight button. Usually the APO feature is disabled when the data link is enabled. Check the backlight button to see if it is sticky, or perhaps there is some stray solder on the PCB at the button pad.
Rigol DSA815-TG Block Diagram anyone? - Page 1
Forum section: electronics / testgear

author: ximac
author_rank: Contributor
timestamp: August 27, 2014, 02:05:08 am
content: Hi,I am in the long process of making an external 3GHz extension for a Rigol DSA815TG. Now asking for a service manual would be too much I know but has anyone seen, and can share, a block diagram. Dave's tear-down goes so far but not quite enough.I want to avoid spurs if possible; hence I'd like to know the mixing process.Cheers - Joe

author: eurofox
author_rank: Unknown
timestamp: August 27, 2014, 09:17:46 am
content: Quote from: ximac on August 27, 2014, 02:05:08 amMaybe you could use an expander like this one ?http://laesentbiz.en.alibaba.com/product/1466125116-210065549/Wide_frequency_1050_9050MHz_with_spectrum_use_Frequency_Expander_AT5000_F9.html

author: ximac
author_rank: Contributor
timestamp: August 27, 2014, 02:19:01 pm
content: Hi,You are right, I could use a device such as you mention but the price puts it out of my league.Thanks - Joe
Korad 3005P Power Supply - installation fail - Page 1
Forum section: electronics / testgear

author: geraldoj
author_rank: Newbie
timestamp: August 30, 2014, 02:20:25 pm
content: Hello friends,I am new here!I have bougth a Korad 3005P Power Supply. During the SW installation in my netbook, I got the error message"This product does not supports Windows Starter Edition".Do you know any way to install the SW without having to update the Windows Edition for a more complete one?Thanks in advance!Geraldoj

author: omgfire
author_rank: Regular Contributor
timestamp: August 30, 2014, 04:01:41 pm
content: http://digital.ni.com/public.nsf/allkb/1817F501D7BA67F28625768F0000B260

author: geraldoj
author_rank: Newbie
timestamp: August 30, 2014, 06:59:46 pm
content: Hello omgfire,Thank you very, very much for your tipp! I followed the steps on the link and it has worked.I could finally make my equipment and its SW works!
Agilent/Keysight U1252B - Page 1
Forum section: electronics / testgear

author: Joel_l
author_rank: Frequent Contributor
timestamp: August 22, 2014, 08:46:39 pm
content: Hi,I just bought a U1252B meter. I'm pleased with the meter but I'm trying to use the remote handheld data logger software on my win7 64 box. It installs fine but when I run it, it crashes when it gets to the point it's checking for updates. Don't know if it's crashing during or just after this phase. I have tried disabling my anti-virus/firewall but no change. Any thoughts?ThanksJoel

author: nanofrog
author_rank: Super Contributor
timestamp: August 23, 2014, 12:00:35 am
content: I have the same meter, but haven't tried this particular software (didn't even know about it until your post). Also running Win7-64, so might install it and see what happens, as I'd like to know what the difference is between it and the previous GUI Data Logger software is (other than a name & brand change, and apparently auto-update).If you're set on using it, perhaps trying to skip the auto-update and see if it will run?Otherwise, just use theGUI Data Logger software v.1.7.1.0(at least it works) until they get the bugs worked out of the new software.Update:Downloaded and installed the new software, and it's not working for me either. Installs fine. Launch for the first time and it fails after it begins "checking for updates". Followed by an invocation target exception error message.May have a fix, which is to enable FIPS (How-To; there may be implications so read carefully first), and reboot.

author: Joel_l
author_rank: Frequent Contributor
timestamp: August 23, 2014, 01:46:59 am
content: I tried the older version, seems to work fine. I tried the new version on my machine at work which is also win7 64, works fine there. Not sure whats up with my home machine. Seeing as the old version works, I wont worry about it.ThanksJoel

author: nanofrog
author_rank: Super Contributor
timestamp: August 23, 2014, 02:01:29 am
content: Quote from: Joel_l on August 23, 2014, 01:46:59 amTaken a look at the fix I linked in my previous post?Might get your home system up and running. Suspect your work computer may already have FIPS enabled (IT elves working in the shadows for your protection).Anything of note you might be able to offer with the newer version vs. the older GUI Data Logger (1.7.1.0)?Or am I wasting my time?

author: Joel_l
author_rank: Frequent Contributor
timestamp: August 23, 2014, 02:13:46 am
content: I will check if FIPS is enabled on my work machine when I'm back in Monday. I loaded the new software at work to see what it was before I bought the meter but didn't really use it so I have no impressions. The old software seems fine and I like the look of the interface better. Other than that, I have no opinion yet.Joel

author: nanofrog
author_rank: Super Contributor
timestamp: August 23, 2014, 04:11:01 am
content: Fix Update:Enabling FIPS got further, but still get the same fatal error.

author: Joel_l
author_rank: Frequent Contributor
timestamp: August 26, 2014, 07:16:16 pm
content: I checked my work system and FIPS is not enabled.Joel
MSO2000 Horizontal Adjustment / Scrolling - Page 1
Forum section: electronics / testgear

author: AntiCat
author_rank: Contributor
timestamp: August 25, 2014, 09:48:56 pm
content: HiI have a Rigol MSO2000. I am trying to analyses a problem using the logic inputs. First I do a single shot capture. Second I scroll through it.I have to zoom quiet far in to see the single bits. At that high resolution the vertical scroll seems to be ridiculously slow. I have to turn the knob 2-3 times to scroll one full screen left or right. What am I doing wrong?I can zoom out and zoom in at another position but that is not much fun. Is there any option to "jump" a half or a full screen width left or right?

author: AntiCat
author_rank: Contributor
timestamp: August 25, 2014, 10:03:32 pm
content: I found it. The "Navigation Knob" has to be used insted of the Position KnobEdit: If there are other ways to do it I am still interested in hints.
identify a Tek Probe please - Page 1
Forum section: electronics / testgear

author: Martin.M
author_rank: Frequent Contributor
timestamp: August 24, 2014, 05:36:18 pm
content: I got this large 3kV Tek probe, there is no Tek-No anywhere.So i want to identify this. Thank you for any information.greetingsMartin

author: kc9qix
author_rank: Newbie
timestamp: August 24, 2014, 11:14:14 pm
content: It looks like the probe for a Tektronix A6902B Isolator.

author: David Hess
author_rank: Super Contributor
timestamp: August 25, 2014, 06:55:12 am
content: That fits the description but I do not have a picture of the probe itself. I think it would be part number 010-0409-01. One of the Tektronix catalogs with the A6902B Voltage Isolation Amplifier probably has a picture of the probe.

author: picburner
author_rank: Frequent Contributor
timestamp: August 25, 2014, 03:38:16 pm
content: Here are some photos, the probes belong just to A6902 Isolator:http://www.ebay.com/itm/Tektronix-Isolator-w-Probes-A6902-/271083338047

author: David Hess
author_rank: Super Contributor
timestamp: August 25, 2014, 04:10:39 pm
content: I have not used one but they are suppose to be pretty neat if you have a use for it.
HP 8568A External Trigger Slope - Page 1
Forum section: electronics / testgear

author: George_Race
author_rank: Regular Contributor
timestamp: August 24, 2014, 09:06:00 pm
content: Working in Zero Frequency Span question.On the 8568A I believe the external trigger only triggers on the rising edge of the trigger pulse to the rear panel.Does anyone know if there is a way to make it trigger on the falling edge of the trigger pulse to the rear panel?I assume it triggers at the start of the rise time, is there a way to adjust the level at which it triggers.Thanks,George
EDC MV-100 DC Voltage Standard - Page 1
Forum section: electronics / testgear

author: eurofox
author_rank: Unknown
timestamp: October 01, 2013, 10:27:42 pm
content: Hi voltage standard fanatics,I got mine for 182,5$ tested and warranty that it is working.eurofox

author: HighVoltage
author_rank: Super Contributor
timestamp: August 23, 2014, 01:09:52 pm
content: I am looking for some 100V Standard to calibrate an Agilent 34401A in the 100V range?How do people usually create a 100V DC signal, if they do not have the ultra expensive Fluke calibrator?Any Idea where to get a low cost 100V DC Standard?

author: avvidclif
author_rank: Regular Contributor
timestamp: August 24, 2014, 05:26:22 am
content: Quote from: HighVoltage on August 23, 2014, 01:09:52 pmAccuracy costs money. How accurate do you want to be, or need to be.

author: David Hess
author_rank: Super Contributor
timestamp: August 24, 2014, 09:23:39 am
content: Ten 10 volt shunt regulators in series would be relatively inexpensive.http://www.ti.com/lit/an/sbaa203/sbaa203.pdf

author: babysitter
author_rank: Frequent Contributor
timestamp: August 24, 2014, 12:21:26 pm
content: AC wall wart, trimborn multiplier and a big bunch of lo-voltage zeners selected for low (not zero) changes give me around 100V. Needs to be measured with a reference DVM immediately before/during use (copypasta by GPIB if possible)

author: HighVoltage
author_rank: Super Contributor
timestamp: August 24, 2014, 08:17:51 pm
content: Quote from: David Hess on August 24, 2014, 09:23:39 amThat is an interesting paper.I though of adding 10 pieces of 10V standards together but expected the error and variations to grow too high.The paper explains well that "a precision device can be built without using precision components".I think, I will build a 100V and a 1000 V standard this way.Thank you very much for that link.

author: robrenz
author_rank: Super Contributor
timestamp: August 24, 2014, 08:23:27 pm
content: Quote from: babysitter on August 24, 2014, 12:21:26 pmA HP 6115A supply will do the trick if you are just looking for a transfer mechanism.

author: HighVoltage
author_rank: Super Contributor
timestamp: August 24, 2014, 08:33:47 pm
content: Quote from: robrenz on August 24, 2014, 08:23:27 pmThe HP6115A would also be a a good alternative, thanks.May be hard to find in Germany.And I think they are hard wired for 115V, 60Hz and not switchable to 230V?Is that correct?Or can they easily be modified for 230 V?

author: robrenz
author_rank: Super Contributor
timestamp: August 24, 2014, 08:56:35 pm
content: Flick the switch on the back and change the fuse and you are ready for 240
Agilent 2000x does it have a rolling screen mode? - Page 1
Forum section: electronics / testgear

author: JayDee
author_rank: Contributor
timestamp: August 27, 2014, 05:56:31 pm
content: Hi,Maybe someone can help...Does the Agilent 2000x series have a 'rolling' screen mode? Working with slow moving signals, I find it useful to see the waveform vary as I'm moving the sensor input. It seems to only update the screen once after it has captured a full sweep.Apologies if this is a recurring question, I could not find a solid answer on the net or in the manual.Thanks, Jay.

author: plesa
author_rank: Frequent Contributor
timestamp: August 27, 2014, 06:01:28 pm
content: Yes, of course - it is available in Horizontal menu.

author: JayDee
author_rank: Contributor
timestamp: August 27, 2014, 06:07:56 pm
content: Yep, thanks...went round and round but totally missed the Horizontal button next to the time base rotary.Sorry for the dumb arse Q. Thanks, J.

author: DavidDLC
author_rank: Frequent Contributor
timestamp: August 27, 2014, 06:44:52 pm
content: Don't worry, we are not looking for perfect people here, we all have mistakes and miss things.David.
OEM, ODM, brand new, used..?? - Page 1
Forum section: electronics / testgear

author: razirafi
author_rank: Newbie
timestamp: August 24, 2014, 04:37:34 am
content: Hi to all, I am Irwin of the Philippines but I am in another country right now on a working visa. I am primarily an electronics tech, working on consumer electronics, automotive electronics, PLC control systems and other electro-mechanical stuff. I have a Tektronix 2235 AN-USM488 that I left at home because of its physical size. I am currently contemplating on purchasing a DSO and I have found more than a few that would suit my needs but I am still on the fence on which brand and model to buy. I have seen a GW Instek GDS-122 and an Owon HDS1021M and the price difference is quite great. When I looked closely they looked exactly the same so I would like to know who copied who. GW Instek I think has been making scopes before Owon did, basing on what I have read in their websites. Another is the Siglent and the Hantek handhelds, which also look identical. Can someone enlighten me on this? I plan to purchase a handheld for basic field use and for automotive use so the 20MHz bandwidth is sufficient although a used (and not too expensive) Tektronix THS710 or the THS720 is also on my list. Back home, my brother-in-law has a Fluke 123 and I have used it extensively but the problem is that the battery drains quickly, even with a brand new battery pack...and the price is beyond my budget.On the portable DSO side I have seen the Rigol DS1102 and the GW Instek GDS-1102. I have done my research and I get different opinions, which is making it difficult for me to choose between the two. What I need is a 100MHz, 2-channel scope that will be for general purpose use on a home lab setting to complement my analog Tek 2235. As a side note, I am willing to stretch my budget to afford the DS2012 if only for its 2GS/s sampling rate.I have watched video reviews and read online reviews but still, I am not sure which of the brands to go for...please enlighten me guys.
HP 208A test oscillator, FREE. (I hate Ni-cad batteries) - Page 1
Forum section: electronics / testgear

author: TerraHertz
author_rank: Super Contributor
timestamp: August 22, 2014, 12:46:32 pm
content: I hate Nickel Cadmium batteries so much!Today I've been having a bit of a clean up. Well, actually I'm looking for something I can't find. Months ago I trashed a dead HP Prolient rack server for parts. It had some nice small fans, that would probably be suitable for to use in a current project. Of course back then I somehow neglected to put the fans in the box with all the other salvaged 12V computer fans. So they are 'somewhere'.If I merely search for them it will go on indefinitely, and nothing useful will get done. It's best to do something else in the meantime, and the fans will (hopefully) turn up. So I'm taking the opportunity to do some serious tidying and crap-culling.So far still no fans, but in going through one shelf I found a box I had no memory of whatsoever. Opening it I found an old HP 208A test oscillator, with top and bottom covers removed (and in the box.) There's a vaguest tickle of memory about this, but it's mainly a general sense of revulsion. No recollection at all of where the unit came from.The revulsion is understandable. It seems that back then I'd opened it, and discovered it contained nickel cadmium batteries. Maybe they were starting to corrode a bit even then. Apparently I put it in the box to de-battery and clean it up later. And promptly forgot about it.Fair enough, it probably happened sometime in the interval 1999 to 2005, when my life was kind of generally drama-filled and distracted. Anyway, the batteries have had maybe another 10 years to work their chemical wiles. So now the unit is pretty messed up in the area of the batteries.I don't need this. Have plenty of other far better signal generators, and while I like restoring old HP and Tek gear I currently have waaaaay too many projects.So it's up for grabs, as is. All the bits are there. I've cut the batteries loose and plastic bagged them. Pity I didn't do that back then! Probably really thought I was going to get to it 'later in the week' or something.Anyone want to try doing a robrenz on it?It's yours for the low low price of free, come and take it away. Urrrgh. I hate ni-cad batteries.
hantek cc65 current probe D.C offset  - Page 1
Forum section: electronics / testgear

author: R_G_B_
author_rank: Frequent Contributor
timestamp: August 21, 2014, 08:01:46 pm
content: I was testing the Hantek CC65 and found that it produces distorted asymmetric waveforms. However increasing the D.C offset voltage from the function generator corrects this. I'm suspecting the hall effects sensors are better suited to D.C rather than A.C. current hence this effect? I will have to check this by increasing in current to see if this effect is because I was using approximatly 30ma current draw.
DMM - Matching Brymen and Amprobe models - Page 1
Forum section: electronics / testgear

author: boo9
author_rank: Contributor
timestamp: August 21, 2014, 12:30:27 am
content: I read on this forum Brymen is OEM for AMprobe.Can one match Bryment models to AmProbe models then ?

author: Lightages
author_rank: Unknown
timestamp: August 21, 2014, 03:04:11 am
content: Brymen is not the only OEM for Amprobe, but yes some models match in specification at least if not in exact construction. The Amprobe AM-220 to AM-270, and the AM-140-A and AM-160-a models match up with the Brymen models. I am not going to list them because it is a bit of work sorting them all out. The AM-160-A is the same as the Brymen BM859A and also the Extech MM570A, if I remember correctly, just in different cases.

author: boo9
author_rank: Contributor
timestamp: August 21, 2014, 08:35:11 am
content: thank you @lightages for your reply,would you happen to know of the top of your head if brymen BM257 or BM257S model masquarades itself as other brand model ?

author: omgfire
author_rank: Regular Contributor
timestamp: August 21, 2014, 01:52:58 pm
content: Quote from: boo9 on August 21, 2014, 08:35:11 amGreenlee DM-510A.

author: Lightages
author_rank: Unknown
timestamp: August 21, 2014, 03:35:40 pm
content: Usually the Greenlee rebadged versions cost much more. I did find this though:http://www.acmetools.com/shop/tools/greenlee-dm-510aBut why pay even this much more when you can get the BM257 from iloveeletronics here, Franky, for $135 shipped to your door?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: August 21, 2014, 03:53:19 pm
content: Quote from: Lightages on August 21, 2014, 03:35:40 pmAt least in the USA, the Greenlee comes with a Limited Lifetime Warranty versus Brymen's shorter warranty. Plus there is an american service center, Brymen you have to ship it back to either Franky or Brymen.

author: Lightages
author_rank: Unknown
timestamp: August 21, 2014, 05:18:04 pm
content: Those are good points. It perhaps is worth the extra price for the DM-510A from ACME with this in mind. Brymen has told me that the companies that are re-branding the Brymen meters are so confident in the meters that they add their own lifetime warranty themselves. This is easy to understand when some of the re-brands cost almost twice as much as the original. I am sure that Brymen would also offer a lifetime warranty if they doubled their prices too. In Brazil, the MiniPa re-branded versions sell for 5 to 7 times the price of the original but in Brazil everything is ridiculously expensive.

author: Wytnucls
author_rank: Super Contributor
timestamp: August 21, 2014, 05:57:46 pm
content: Possibly Metrel MD 9016http://www.metrel.si/products/digital-multimeters-current-clamps-voltage-testers/digital-multimeters/md-9016-digital-multimeter.htmlhttp://www.metrel.si/fileadmin/BAZA_od_Damijan_Dolinar/Metrel/Navodila_instrumentov/Additional_Programs/MD_9016_Digital_multimeter/Ang/MD_9016_Digital_multimeter_Multilingual_Ver_1.0_20_751_998.pdf
Is Rigol DS1074Z  hackable to increase bandwidth to 100 ? - Page 1
Forum section: electronics / testgear

author: samisin
author_rank: Newbie
timestamp: August 20, 2014, 08:10:11 pm
content: Hi All,I am pretty new to this blog . I just bought a ds1102e but l am thinking to return it back and get a Rigol DS1074Z.My reasons :1-much bigger memory depth2-bigger screen3-ultra vision softwareI am not familiar with onlocking and hacking approaches for Rigol scopes and could not find clear answers fot these questions by just searching :1-Is it possible to increase the bandwidth of DS1074Z to 100mhz ?2-Is it possible to increase memory depth from 12M to 24M3- Is it possible to unlock decoding and recording features ?Thanks alot

author: ElectricGuy
author_rank: Regular Contributor
timestamp: August 20, 2014, 09:59:38 pm
content: Quote from: samisin on August 20, 2014, 08:10:11 pmAnd what about a search on the fórum?

author: samisin
author_rank: Newbie
timestamp: August 20, 2014, 10:30:46 pm
content: I was searching topics and couldn't find any clear information about ds1000z series.But later on I saw some guides on ds2000 series related topics .But Yes you are right I am sorry for inconvenient.

author: nixfu
author_rank: Unknown
timestamp: August 21, 2014, 02:09:42 am
content: I have one myself and I have done the "upgrade". The scope is a nice upgrade over the other 100mhz models with the larger screen, and the multi-level intensity grading which makes it more like traditional scope and I didn't know how important it was until trying a scope without it.Use one of the On-Line Keygenerator (you want to use it for DS1000z) at* >RigLol keygen:http://riglol.3owl.comCanadian mirror:http://gotroot.ca/rigol/riglol/UK mirror:http://rigol.avotronics.co.uk/mirrors/riglol/Do NOT install 500uV Vertical Sensitivity, as it doesn't work properly (buggy*). Therefore do NOT use 'DSBA' - 500uV Vertical, or 'DSFR' - all options.1. Type in your unit's Serial Number.2. Type inDSERfor all options without the 500µV. This Option may not be in the Keygen's list, but it will work!3. Do NOT enter anything for 'Privatekey', it will be inserted automatically for you (based on the DS1000z).4. Press , and record the resulting Option Code.5. When you are done enter the Option Code manually in the DS1000z using a single string without using any 'dash' (-) using Rigol's Procedure for activating the Trial Options in the D1000z. As I recall the procedure is available on Rigol's Web Site under DS1000z.This will enable all the options on the scope that are usually separate, such as decoding of i2c etc.. AND it will change the scope model number to be a DS1104Z (100mhz model) after you reboot once.

author: Fred27
author_rank: Unknown
timestamp: August 21, 2014, 09:50:21 am
content: Quote from: samisin on August 20, 2014, 10:30:46 pmWe can all miss something, but when there's a thread with the title "Rigol DS1074Z Oscilloscope" that gives clear info on hacking it then maybe you need to try a little bit harder with your searching.https://www.eevblog.com/forum/testgear/rigol-ds1074z-oscillosope/?topicseen
AWG2021 Waveform Gen. - What the heck is this port? - Page 1
Forum section: electronics / testgear

author: bengineering
author_rank: Newbie
timestamp: August 22, 2014, 04:44:10 am
content: Just picked this waveform generator off eBay. I think its an external floppy connector, but cant to seem to find if they was an option for it. Figured you guys could shed some light on it!

author: c4757p
author_rank: Super Contributor
timestamp: August 22, 2014, 04:59:53 am
content: GPIB. Is it as recessed as it looks??

author: bengineering
author_rank: Newbie
timestamp: August 22, 2014, 05:11:38 am
content: This port is much smaller than a GPIB connector and is in the area where the floppy drive should be at. Connector is about 20mm wide by 6mm tall. It is recessed about 20mm in.

author: kolbep
author_rank: Frequent Contributor
timestamp: August 22, 2014, 05:21:22 am
content: Not a rebranded TEK?If it is, maybe this manual will help:http://exodus.poly.edu/~kurt/manuals/manuals/Tektronix/TEK%20AWG%202021%20Service.pdf

author: bengineering
author_rank: Newbie
timestamp: August 22, 2014, 02:48:09 pm
content: Thanks guys! After looking at the service manual it is a rackmount option that brings the floppy out to the front panel. Looks like I will pick up one of those usb floppy drive emulators for it that dave mentioned"For Option 1R, the waveform generator is configured for installation in a 19-inch wide instrument rack. In this configuration, the floppy disk drive is mounted on the front panel. To change an AWG2021 into a rackmount version, you can order an upgrade kit."
Old Geiger counter teardown - Page 1
Forum section: electronics / testgear

author: denelec
author_rank: Regular Contributor
timestamp: August 19, 2014, 10:24:07 pm
content: I have an old Geiger counter a friend gave me many years ago.It's aACR Industrial Services model 661.Seems to be 1960's vintage. Couldn't find much on the web about it.It still works. It indicates about 25 cpm (counts per minutes) with only background radiation.If I place an old lamp mantle (thorium oxide) next to the tube, the reading goes to about 900 cpm.It uses a 1B85 Geiger tube which date from the 1950's.https://www.orau.org/ptp/collection/GMs/victoreen1b85thyrode.htmThe voltage at the tube is only 202Vdc. It is quite low. I don't know if it's normal. It seems to work anyway.Does anybody knows anything about this equipment?

author: denelec
author_rank: Regular Contributor
timestamp: August 19, 2014, 10:37:34 pm
content: The output of the audio jack gives a series of random pulses, each corresponding to a particle detection.

author: GEuser
author_rank: Frequent Contributor
timestamp: August 20, 2014, 02:16:38 am
content: I like it , real old school and looks straight out of the movie "The Thing" .Is there a audible clicker in it I could not notice one , but just aside I can see some electrolytics that should be replaced , and what's the current draw using batteries any idea?Nice pics and thanks for the effort btw ..cheers .

author: bench_knob
author_rank: Regular Contributor
timestamp: August 20, 2014, 08:40:48 am
content: Wanna know if the unit is working correctly?Use Wenzel's Geiger-Counter simulator to synthesize known counts and its useful for calibration:http://www.techlib.com/science/geiger.html#Geiger%20Tube%20SimulatorHis website is chockful of circuit goodies (an authentic design engineer):http://www.techlib.com/electronics/index.htmlbench_knob

author: denelec
author_rank: Regular Contributor
timestamp: August 21, 2014, 12:26:18 am
content: The current drain on the battery is about 3mA. Battery life must have been very good.The voltage multiplier circuit contains 2 2N1307 PNP Ge transistors for the oscillator. I can hear a very high pitch noise when the counter is on.There is also 4 old style PH204 silicon diodes. They tested Ok on my multimeter. With 4 diodes, it's probably a voltage quadrupler at the output of the transformer.The other board contains 3 2N3392 NPN Si transistors.The PC boards are very rustic. No silk screen. No solder mask. Everything looks hand soldered.There is no nameplate, no serial number anywhere.The counter wasn't mass produced, for sure.So, what we have is a circuit that produce a high voltage for the Geiger tube.Every time a particle or gamma ray hits the tube, a small current impulse is generated. The current gets amplified, integrated and displayed on the meter.With the audio output of the counter and the radioactive mantle, I could check the calibration. All I need to do is check if the pulse count match what the needle indicates.
Amprobe AM-530 multimeter price in your area! - Page 1
Forum section: electronics / testgear

author: ing0
author_rank: Newbie
timestamp: August 12, 2014, 01:18:00 pm
content: Hey all,I've been looking at buying aAmprobe AM-530and I was shopping around online and noticed that the price in the UK varies from about ~£70 to ~£140 (which is the equivalent to ~$117 to ~$234). I then decided to do a quick search on some US sites and found that this same product is available for less than $60 on various sites including Amazon US. All prices mentioned are ignoring shipping.So am I missing something here or is this just another reason for me to leave the UK?Thanks

author: KedasProbe
author_rank: Frequent Contributor
timestamp: August 12, 2014, 02:23:29 pm
content: Add it to your list of reasons, in euro it is also more but not that much.Due to the magic 1/1 currency ratios.

author: ing0
author_rank: Newbie
timestamp: August 12, 2014, 04:47:32 pm
content: I'm starting to think that importing one (or possibly a better multimeter) will be the cheapest option. I recently imported a 240v Weller WES51 soldering station from the US which set me back about £150 (£70 of that was 3 week shipping) and yet to buy over here will cost around £300!!!So now I've discovered that "Rip off Britain" plays a part, do I just import the Amprobe or maybe go for something more expensive? Hmmm...

author: boo9
author_rank: Contributor
timestamp: August 20, 2014, 01:52:28 pm
content: In 2012 there has been a safty recall of am-530http://www.amprobe.com/Amprobe/usen/Service/Safety/AM-540-and-AM-550Recall.htm?trck=recallI see am-530 on ebay. Anybody know how to identify faulty models ?

author: Wytnucls
author_rank: Super Contributor
timestamp: August 20, 2014, 01:58:50 pm
content: According to your link, the Amprobe AM-530 is not affected by the recall.
Rigol DS1074Z hackable? - Page 1
Forum section: electronics / testgear

author: ninjastrike
author_rank: Contributor
timestamp: August 19, 2014, 07:38:21 pm
content: Does anyone know if the rigol ds1074z is hackable ?I've not been able to obtain viable information on this.

author: Mr.B
author_rank: Unknown
timestamp: August 19, 2014, 08:20:03 pm
content: Have you tried the forum search option?It is pretty easy really...https://www.eevblog.com/forum/beginners/upgrading-rigol-ds1074z-(1000z-series)-to-unlock-options/
Fluke 87 (base model), 29 Series II, or 187 (how much Fluke do I need) - Page 1
Forum section: electronics / testgear

author: gooseEL34
author_rank: Regular Contributor
timestamp: August 18, 2014, 09:07:43 pm
content: Hey guys.Not an EE, just a tinkerer. Here's what I generally use a DVOM for:1. Checking the DC resistance of an unlabeled guitar speaker to ascertain whether it is a 4, 8 or 16 ohm speaker2. Checking B+ voltages inside vintage tube guitar amps (generally 300-450vDC)3. Measuring current in the 20-40mv range inside tube guitar amps.4. Checking resistors to see if they are within tolerance (again, inside guitar amps/pedals)5. Checking connections with the resistance settings inside auto/motorcycle wiring (for example, I was able to determine that a fan relay was dead in my wife's car by determining that when the relay was supposed to be engaged there was no connection between the wiring harness and the fan pigtail as it should have been).I am trying to sell off some stuff to raise funds for debt reduction. I believe all these meters do what I need. I don't believe I need 0.01% accuracy, as I am generally not dealing with precision values (rarely, do I need to know the voltage at the plate of a tube within 1%).Is there an argument to be made for keeping anything BUT the 29 and offing the 87 and 187?I don't have them in front of me, but I don't believe the 29 is backlit, but as I am usually on the bench, backlight is not necessary.I don't generally need min/max readings or logging.Thanks for your input(all meters were less than $20 at my local pawn shop).

author: retiredcaps
author_rank: Super Contributor
timestamp: August 18, 2014, 09:42:00 pm
content: Quote from: gooseEL34 on August 18, 2014, 09:07:43 pmAny of the meters you listed will meet your requirements.You can make some $$$ by reselling the Fluke 87 and 187. The fair market ebay value for the 87 is around $100 and the 187 is around $200. So you have the potential to make $260 ($300 - $40 cost) and help with your debt.PS. I wish I had a pawn shop that sold Flukes for $20 each.edit: Misunderstood that OP already has all 3 Flukes.

author: gooseEL34
author_rank: Regular Contributor
timestamp: August 19, 2014, 04:12:25 am
content: Thanks for the info. Seems like the 29 was the way to go (and it was only $14 with leads and rubber case and leather/vinyl carry bag).

author: retiredcaps
author_rank: Super Contributor
timestamp: August 19, 2014, 04:51:11 am
content: Quote from: gooseEL34 on August 19, 2014, 04:12:25 amYou should visit that pawn shop more often and try to get more meters in the $20 range and resell them. The high end ones like the 187 would give you most profit.
Fluke 87 (base model) -- odd noises on startup?  Normal - Page 1
Forum section: electronics / testgear

author: gooseEL34
author_rank: Regular Contributor
timestamp: August 18, 2014, 09:00:09 pm
content: Hello all-I am not an engineer. I tinker with tube amplifiers (guitar amps), and mainly use a meter to test B+ voltages inside the amp.I have a second hand Fluke 87. Two issues. Are they a problem?1. First issue is a series of noises upon startup. I am not sure how to describe it, but it is not beeping from the piezo buzzer but rather some noises that sound like when you touch a battery to the terminals of a guitar speaker. Maybe a "chirp" might describe it. Hard to describe, but does anyone out there have any noises that occur when the dial is rotated to any on position? Also, I did notice one time that when it was in the off position it was still "on" (as if the rotary switch was still making some contacts when in that position)2. The plastic part of the VOhmDiode probe input is broken off. It appears to me that contact is still being made as intended. Is this something I should replace?

author: retiredcaps
author_rank: Super Contributor
timestamp: August 18, 2014, 09:47:35 pm
content: Quote from: gooseEL34 on August 18, 2014, 09:00:09 pmA click click sound at startup is normal for the Fluke 80 series (I, III and V).QuoteYou can do a DIY fix by readinghttp://mrmodemhead.com/blog/fluke-banana-jack-repair/Other "known" potential problems with the original 80 series I are: faded lcd digits, blown PTC, fusible resistor, broken input jacks, dirty pcb causing problems. Don't judge the 80 series I too harshly though because they go through harsh enviroments and is more than 25 years old.PS. All the described potential problems are also very well documented at modemhead's website.

author: gooseEL34
author_rank: Regular Contributor
timestamp: August 19, 2014, 04:06:04 am
content: Thanks. But unlike the pic in the repair blog, my shroud is not totally gone. It is broken cleanly right at the top edge so the lower part (sleeve) is still there, stopping the jack halves from spreading. Thanks for the input.

author: retiredcaps
author_rank: Super Contributor
timestamp: August 19, 2014, 04:54:06 am
content: It might detract a potential buyer and they may ask for $10 off, but it should be okay.
UNI-T UT61 - Page 1
Forum section: electronics / testgear

author: avaldezc92
author_rank: Contributor
timestamp: August 18, 2014, 04:33:05 pm
content: Hi guysI have this DMM (UT61) and I'm looking a software that let me read two multimeters at same time. Does anybody has one?Greetings from Mexico-Angel

author: iloveelectronics
author_rank: Frequent Contributor
timestamp: August 18, 2014, 04:39:46 pm
content: You should be able to do it with the software that comes with the meter. Just install 2 copies of it under 2 different directories, and run them both, with each connecting to a DMM.

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: August 18, 2014, 08:48:39 pm
content: You can also check out UltraDMM. Freeware which I think is better than the supplied software.http://www.ultradmm.com/

author: avaldezc92
author_rank: Contributor
timestamp: August 18, 2014, 10:28:21 pm
content: UltramDMM looks great, I'm going to check it outThanks for your replies!
Second Hand Analog Oscilloscope? - Page 1
Forum section: electronics / testgear

author: zerorisers
author_rank: Regular Contributor
timestamp: August 09, 2014, 10:37:09 pm
content: Hello everybody; sorry if this post is a bother, but I am new to the industry of electrical engineering and was wondering if anybody had an old analog oscilloscope that they where willing to give away or sell? I dont have much money so that is why I am asking.Again, sorry if I am a bother with this post.Thanks in advance,zerorisers

author: nanofrog
author_rank: Super Contributor
timestamp: August 10, 2014, 01:43:34 am
content: Since there's no budget or any other parameters offered up, best I can do are a couple of WAG's in the form of eBay links (few if any bidders, and not as popular a brand name tend to keep prices lower).Kenwood CS-4025 Oscilloscope 20MHz Dual TraceLG OSCILLOSCOPE OS-5020 20MHZ

author: d-chord
author_rank: Contributor
timestamp: August 18, 2014, 02:45:20 pm
content: Incidentally, I ended up buying that LG unit described above. It was for sale as non-working/for parts. Channel 2 works, but it looks like channel 1 is blown. I can't find a schematic for it anywhere, but it's all through-hole and looks very simple. I'm planning to swap some components (JFET, op-amp, etc) between channels 1 and 2 to find out what's failed. Total cost with shipping was $40.62. I expect to spend under $10 in parts to fix it and then I'll have my very first oscilloscope! That particular unit doesn't have trigger holdoff, but for many things that's fine.-David