hybridfree/eevblog-posts huggingface dataset:
HP-5359A and HP-3326A EPROM Images - Page 1
Forum section: electronics / testgear

author: MadTux
author_rank: Frequent Contributor
timestamp: October 30, 2014, 03:33:59 pm
content: Hi everyoneHere are the ROM images of the HP-3326A dual channel synthesizer and the HP-5359A pulse generator.This started after I got a second HP-5359A pulse generator for repair quite cheaply. In contrast to the first one, which miraculously repaired itself on the way to me, as it didn't display any faults any more as it did on ebay and had a perfect output signal, the second one arrived completely dead although it appeared to be working on ebay.So I checked the voltages, which were fine. After that, I started to swap individual cards from the bad one to the good one and soon found that the CPU card and most others were fine and the EPROM card to be completely dead. OK fine, dead EPROMs, I thought and swapped the good EPROM card to the bad unit in hope that it would power up. It didn't and the good EPROM card was dead, too. SHIT.Fortunately the EPROMs are OK, so there must be a/be bad latch/es on the EPROM board, probably caused by another card that has some fault, too => more repair, first I'll build an adapter for my logic analyzer to check the logic levels on the main board.In the process of dumping the old 2708 EPROMs (details in the attachment), I decided that I could also unsolder and dump the 27256 EPROMs of the 3326A that I recently repaired, as the ROM images aren't online yet. BTW, the 3326A is a really nice function generator that can generate 2 fixed phase offset signals bewtween 0-13MHz, ideal to test e.g. 3 phase asynchronous motors.Attachments are 7z compressed files, renamed to .txt, since 7z gives the best compression ratio and the stupid forum software doesn't allow me to upload 7z files, so I renamed them

author: KE5FX
author_rank: Super Contributor
timestamp: November 01, 2014, 08:42:22 am
content: Good stuff! You might also upload them to the Manuals page athttp://www.ko4bb.com-- I don't think those particular images have been posted by anyone else.
Byrmen BM251 low ohms range - Page 1
Forum section: electronics / testgear

author: qpit3a
author_rank: Contributor
timestamp: November 01, 2014, 12:25:05 am
content: I have a hand-me-down BM251 from my son who graduated to some expensive fluke thing. The BM251 has had hard use (he is an air-conditioning apprentice) and I note that the lowest ohms only seems to go down to about 1 ohm (using a single test lead shorting COM and ohms, is that normal?

author: Rick Law
author_rank: Super Contributor
timestamp: November 01, 2014, 01:13:50 am
content: Quote from: qpit3a on November 01, 2014, 12:25:05 amFor very poor quality probes (or dirty ones, or dirty plug/socket), 1ohm is not out of the question.Clean the probe connectors and socket with some moist alcohol paper towel, see if that reduce it. After that is done, it should go down some.
Agilent Infinivision: disable help on bootup - Page 1
Forum section: electronics / testgear

author: Pack34
author_rank: Frequent Contributor
timestamp: October 30, 2014, 10:46:59 pm
content: I have an Agilent InfiniVision MSO-X 2024. When you turn the scope on I always get the help screen with huge arrows pointing towards language selection.Is there a way to disable this? I'm running the most recent firmware.

author: EEVblog
author_rank: Unknown
timestamp: October 30, 2014, 11:25:35 pm
content: Yeah, it's pretty annoying.Lots of companies do this on lots of professional products.They put in the help thinking it's great for the first time user, and then don't think about anyone after that.My semi-professional Canon video camera for example pops up all the time with an annoying "Don't forget to back up your video" message.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 30, 2014, 11:44:22 pm
content: It's not so much for the first-time user, but for when some idiot decides it's funny to set your scope to Korean or something...If you've ever tried to navigate through a menu system in Chinese on something that doesn't have this feature, you'll understand....

author: Hydrawerk
author_rank: Super Contributor
timestamp: October 31, 2014, 12:21:20 am
content: I think that DSOX2000 is for education. So there is no annoying beep and as mikeselectricstuff said, there is a protection against evil students who can set your scope language to Thai or Japanese.

author: EEVblog
author_rank: Unknown
timestamp: October 31, 2014, 12:27:33 am
content: Quote from: mikeselectricstuff on October 30, 2014, 11:44:22 pmI have.Buteverytime you turn on the scope?That wastes far more time and cause for more frustration than the chance someone will set your scope to Chinese will.Perhaps they should just include a "Language Reset" instruction page in the manual?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 31, 2014, 01:41:31 pm
content: This is what the MSO6000 series does - it will disappear after a while, but also goes as soon as you touch any button, so not a big deal - does the DSOX actually delay you doing anything while it's showing it?

author: LabSpokane
author_rank: Super Contributor
timestamp: October 31, 2014, 04:08:00 pm
content: The startup screen is really annoying. I want my equipment to boot up where I left off.Let's all call support and ask for a fix. If the education market needs that feature, they can load their own firmware dedicated for the purpose.
Agilent E3631A or Keithley 2230-30-1 - Page 1
Forum section: electronics / testgear

author: kamran4149
author_rank: Newbie
timestamp: October 31, 2014, 04:55:53 pm
content: Which one of these two bench power supplies are more user friendly, reliable and standard for educational purposes? I am putting a lab together for an educational institute and need to make a decision as which one to purchase?Which one would you recommend? Any input would be appreciated.

author: electronic_eel
author_rank: Regular Contributor
timestamp: October 31, 2014, 08:25:40 pm
content: Basic design & build quality comes first, but with both of these brands you won't do anything wrong.With a bench supply it is important to me that I can easily see whats going on, so I want to see the voltages & amps of all outputs at once without pressing any buttons or similar.The Agilent one only shows the data of one output: big minus.I can also recommend these ones:http://www.tti-test.com/products-tti/psu/qlp-series.htm

author: kamran4149
author_rank: Newbie
timestamp: October 31, 2014, 09:26:42 pm
content: Thank you for the response. Honestly I am very familiar with the Agilent E3631A and have worked with them for many years. However, I have never worked with the Keithley 2230-30-1. But it seems like this one has a few extra features compare to the Agilent and still is less expensive!! I just want to make sure I am not overlooking anything and to make sure that Keithley is also user friendly and reliable for educational purposes. From your response, I read that I will no go wrong if I get the Keithley 2230-30-1 Power Supply.Any other input?

author: MarkL
author_rank: Unknown
timestamp: October 31, 2014, 10:19:19 pm
content: I have a E3631A and I find the user interface with the single knob, modal display, and blinking digits to be a bit clunky and unfriendly to use.I haven't used the Keithley 2230-30-1, but it has a keypad to type in the values you want. That's one up on the Agilent right there, especially for student use. And it's also more compact and has higher voltage and current on the 30V channels.

author: kamran4149
author_rank: Newbie
timestamp: October 31, 2014, 11:05:49 pm
content: Thanks for all your responses. I agree it seems like Keithley 2230-30-1 is a good alternative to Agilent E3631A.
A peek inside the Power Designs HV-1556 6 kV High Voltage Supply - Page 1
Forum section: electronics / testgear

author: MarkPalmer
author_rank: Regular Contributor
timestamp: November 04, 2014, 04:52:15 pm
content: There were pictures of the internals of one of the 3 kV Power Designs high voltage supplies posted here on EEV Blog last year. Here are the insides of the HV-1556 6 kV model. Sort of the same thing just on a larger scale. Bigger paper-in-oil Sprague caps, bigger ceramic range switches, and the same type of encapsulated wire-wound precision resistors. The biggest difference is only a single Eimac 4-65 tube is used as the regulator. I had to replace a few e-caps to get it safe for power on, which thankfully was uneventful and everything works as it should. I put a new neon bulb in for the power indicator, and converted the funky output connectors (rear only) to standard binding posts.-Mark-

author: HiTech
author_rank: Regular Contributor
timestamp: November 04, 2014, 09:53:08 pm
content: Nice piece of equipment but I question the John Cena toy action figure. Hopefully the Pwr. Design has a better reputation for stamina and performance than Cena does!! LOL

author: MarkPalmer
author_rank: Regular Contributor
timestamp: November 05, 2014, 03:24:00 pm
content: Not even the 15 time world champion could lure any excitement to this fine power supplyNext time I'll feature Randy Orton taking apart a stupid cheap Chinese multimeter-Mark-

author: idpromnut
author_rank: Unknown
timestamp: November 05, 2014, 03:55:17 pm
content: Quote from: MarkPalmer on November 05, 2014, 03:24:00 pmJust a note, I had to change my boxers TWICE while looking at the above tear down pics.
Hantek HDG2002B Burst mode? - Page 1
Forum section: electronics / testgear

author: RJFreeman
author_rank: Regular Contributor
timestamp: October 30, 2014, 02:46:01 am
content: I am trying burst mode on the HDG2002B and when I change period over 18mS it stops generating bursts and as I want to generate bursts at 50-100Hz this is inconvenient. the software it is running is 1.00.2I presume this is a bug rather than a fault? has anyone tried the burst function?At the moment I am working around it by generating a pulse from one channel into the trigger input and then using gated burst on the other channel.in fact looking through the various threads, I have found bugs mentioned here and there but no unified list, so I am thinking perhaps a new dedicated thread to known Bugs might be in order?

author: alex.forencich
author_rank: Frequent Contributor
timestamp: October 31, 2014, 08:37:19 pm
content: Probably a bug. Not sure if Hantek has much interest in fixing bugs and pushing out new firmware. There is an effort to build a new open source firmware and FPGA config for the HDG2000 series that is currently getting under way, seehttps://www.eevblog.com/forum/testgear/hdg2002b-awg-firmware-reverse-engineering/.
Bay Area Hamfest / fleamarkets for used gear - Page 1
Forum section: electronics / testgear

author: yanir
author_rank: Regular Contributor
timestamp: October 29, 2014, 05:19:30 pm
content: Anyone one in the bay area know of good places to get used rf test gear? Particularly interested in a spectrum analyzer and related accessories.Thanks!

author: SoundTech-LG
author_rank: Frequent Contributor
timestamp: October 29, 2014, 07:34:40 pm
content: http://www.electronicsfleamarket.com/

author: Fluxed Matter
author_rank: Regular Contributor
timestamp: October 29, 2014, 07:39:17 pm
content: Sorry to say, but The Electronic Flea Market is over for the year, the last one was in September. It usually runs from March to September.I don't know of any hamfest is the area.

author: AG6QR
author_rank: Frequent Contributor
timestamp: October 29, 2014, 08:37:44 pm
content: Pacificon is the big regional ham fest. It was the weekend of October 12. You'll have to wait for next year for that onehttp://www.pacificon.org/The DeAnza flea market, linked above, is the big one, but not during winter.If you can't wait until spring, there are some retail outlets that specialize in used and surplus gear. Halted Supply Companyhttp://www.halted.com/and Weird Stuff Warehousehttp://www.weirdstuff.com/are two that come to mind. Those people know what they're doing, so don't expect to find ridiculous bargains there, but you can often find reasonably priced used and surplus test equipment. Both of those stores have web sites, but the web sites are incomplete. You really need to visit in person to get a good idea of what they have in stock.

author: yanir
author_rank: Regular Contributor
timestamp: October 29, 2014, 10:37:52 pm
content: Thanks all, too bad I missed them all. I'll be sure to visit next year. I've been to halted (but not recently) I'll go and take a look at what they have. Always good fun. I'll check out weirdstuff, never been there.
Tektronix TLS 720 - Page 1
Forum section: electronics / testgear

author: Heffa
author_rank: Contributor
timestamp: October 29, 2014, 12:03:08 pm
content: I might be able to score a Tektronix TLS 720 Logic Analyzer with TLA 7N4 plugin for 136 channels(with 8 x P6417 probes) and a TLA 7PG2 Pattern Generator Module (with 4 x P6470 TTL/Cmos probes).What I am worried about is the software - as far as I understand it the latest version of Tektronix' TLS Software to support the 720 is 4.4, and that I cannot find on tek.comWould it be possible to get this software somewhere else in case of a faulty harddrive or similar?Is this behemoth even worth considering buying or is it too old to be really useful?At least I think it looks cool
Quality BNC-BNC M-F adapter - Page 1
Forum section: electronics / testgear

author: Alex Eisenhut
author_rank: Super Contributor
timestamp: October 28, 2014, 03:10:34 pm
content: Anyone have a good eBay item # for a quality connector? I bought a bag of cheapies and they're all useless. Poorly machined, fell apart when I plugged them in.It's for extending a scope's input so I can use P6105 probes without scratching the front panel, because of the probe's "x10" ID pin.

author: TonyStewart
author_rank: Contributor
timestamp: October 28, 2014, 03:59:24 pm
content: pasternack sells all coax conn's/cable/adapters on the left coast in Cali. But Digikey, Future-Active,,even Sayal's has them.
Rigol DS2000 series frequency response/attenuation curves - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: October 23, 2014, 02:07:24 pm
content: Somewhere on the site, I remember there was a post about the frequency response/attenuation curves of the various DS2000 models/modes up to 300 Mhz. But, for the life of me I cannot find this post. If someone can reply with a link, I would greatly appreciate it.

author: marmad
author_rank: Super Contributor
timestamp: October 26, 2014, 07:34:08 pm
content: Here you go.

author: pascal_sweden
author_rank: Super Contributor
timestamp: October 26, 2014, 07:47:35 pm
content: Nice graph.If you apply the software patch to convert the DS2072A to the DS2302A, would the frequency response then exactly look like the DS2302A response? Or is there still this uncertainty about calibration parameters that reside somewhere in the scope's memory?What I don't understand is how a software patch can affect the frequency response behavior? Where in the scope would the actual change in configuration take place?Maybe the scope thinks it's a DS2302A, but I believe that there is somewhere a "hard-coded" hardware element in the signal path that differentiates the respective models, and gives them a distinct frequency response.

author: JDubU
author_rank: Frequent Contributor
timestamp: October 26, 2014, 08:00:36 pm
content: Quote from: pascal_sweden on October 26, 2014, 07:47:35 pmRead the second paragraph of the "Description" on the first page of this datasheet:http://www.ti.com/lit/ds/symlink/lmh6518.pdf
Better screen contrast and intensity grading on DS1000Z than DS2000 series - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: October 25, 2014, 10:57:05 pm
content: Are the below claims about screen contrast and intensity grading been verified and confirmed in the mean time?In the video on YouTube it is claimed that the screen contrast and the intensity grading implementation is much better on the DS1000Z series than on the DS2000 series. At least in the firmware version at the time.This comparison was made in the video below:Has this been improved on the DS2000 series in the mean time? Is the DS2000 series now adopting the better implementation from the DS1000Z series?

author: miguelvp
author_rank: Super Contributor
timestamp: October 26, 2014, 02:57:44 am
content: Maybe he didn't set it up right.In any event, just buy one, once and for all, it's almost 11 months since you've been indecisivehttps://www.eevblog.com/forum/testgear/rigol-ds1074z-or-rigol-ds2072-which-is-the-best-choice-what-sw-upgrades/Just make up your mind please!

author: W7NGA
author_rank: Regular Contributor
timestamp: October 26, 2014, 03:10:53 am
content: why actually use an oscilloscope when you can spend your precious hours talking about them instead?

author: miguelvp
author_rank: Super Contributor
timestamp: October 26, 2014, 03:19:04 am
content: With the time he is spending here and wasting time from the rest, he could have gotten both and keep them bothWe should start a secret pool to see when he will actually get a Scope (If ever)But it seems that from the get go, it's going to either be the DS2000 or the DS1000z since it always comes back to those two.

author: calmtron
author_rank: Regular Contributor
timestamp: October 26, 2014, 12:02:24 pm
content: Determining just exactly what to buy is half of the fun!(I've been deliberating buying a digital oscilloscope almost as long as pascal_sweden)

author: TunerSandwich
author_rank: Frequent Contributor
timestamp: October 26, 2014, 12:12:31 pm
content: If you can afford to wait to buy a scope, you don't really NEED one.....

author: pascal_sweden
author_rank: Super Contributor
timestamp: October 26, 2014, 01:36:34 pm
content: I am waiting on the approval of governmental funding for an innovation project.This takes time, and before the submission was entered (during summer time), I started my review of oscilloscopes (back in January).So when is the spending going to be made? Mid November latest, I will know if I will get the funding or not. Note that you can not spend anything before the official start of the project.Hopefully it is clear now why I have waited so long. And no, my decision is not going to be between a DS2072A and a DS1074Z, but you are very close. It is going to be between an MSO2072A and an MSO1074Z, with the highest chance of MSO2072AHope this clears some lights...Still was hoping to get an update on the screen quality and intensity grading. That guy clearly saw that the screen is better (better contrast).
Broken Rigol DSA815-TG - Page 1
Forum section: electronics / testgear

author: ka7gzr
author_rank: Contributor
timestamp: October 27, 2014, 03:34:56 pm
content: I have had my Rigol DSA815-TG for about nine months. I have been very pleased with it. This past week it appears to have developed a failure. A purple line appeared (like when you create limits) but this line is straight vertical and centered and goes to each edge of the display. It first appears when booting, before any other diplay items appear. All functions appear to operate normally. I am about ready to send it back to Rigol for repair but I thought I would consult with the forum before shipping it off.Jim

author: bktemp
author_rank: Super Contributor
timestamp: October 27, 2014, 04:21:16 pm
content: It seems like a pixel column on the display failed. This can either happen due to mechanical stress or a manufacturing problem (bad contact between column driver ic and display glass).

author: Matje
author_rank: Regular Contributor
timestamp: October 27, 2014, 11:38:55 pm
content: Edit: removed confused post about horizontal line when ka7gzr talks about a vertical line.
Commodore Amiga IEEE-488 interface to communicate with test equipment - Page 1
Forum section: electronics / testgear

author: pascal_sweden
author_rank: Super Contributor
timestamp: October 21, 2014, 02:30:06 pm
content: I recently found out about this IEEE-488 board from ASDG for the Commodore Amiga:http://amiga.resource.cx/exp/twinxQuite impressive. It does support Intel iSBX modules and comes with an IEEE-488 iSBX module.ASDG offered two modules: a GPIB (IEEE-488) module and a dual serial port module.Any other iSBX module can be installed: A/D and D/A converters, digital I/O, servo controllers, stepper motor controllers, etc. They even made video graphics controllers in these iSBX modules!Here is an overview of the available Intel iSBX modules:http://www.intel-vintage.info/intelsystems.htm#876284174Wanted to check if some people here have used this board for automated test measurements with the Commodore Amiga, and if some people have used other iSBX modules as well with it.

author: BH
author_rank: Contributor
timestamp: October 21, 2014, 05:04:13 pm
content: If I'd been born 10-15 years earlier, I'd probably have been interested in this. I did grow up with the Amiga, but I was a child back then so I was mainly interested in gaming and programming with it.These days I still maintain a small fleet of Amiga machines for hobbyist purposes but if I was going to do any instrument control I'd almost certainly do it with a standard PC. I do like the idea of data acquisition with the Amiga, though.I think it would be very difficult to locate one of these expansion cards now.BJH.

author: pascal_sweden
author_rank: Super Contributor
timestamp: October 25, 2014, 10:03:48 pm
content: They appear on Ebay regularly. So not that rare at all. Believe me.Even some people that wrote an improved AmigaDos device driver for it =)
UT61C showing voltage without connection - Page 1
Forum section: electronics / testgear

author: Leonelf
author_rank: Contributor
timestamp: October 27, 2014, 04:56:50 pm
content: Hi!My UT61C shows aprox. 100mV (rising all the time until 300mV) when it isnt connected to anything. Is that static electricity or a malfunction?Greetings, Leon

author: Macbeth
author_rank: Super Contributor
timestamp: October 27, 2014, 04:58:47 pm
content: Short the leads and then see what happens.It's normal.

author: Matje
author_rank: Regular Contributor
timestamp: October 27, 2014, 11:26:16 pm
content: Quote from: Leonelf on October 27, 2014, 04:56:50 pmSo does mine. It is normal, due to the high input impedance static and stuff is getting into it.According to the manual the thing has an input impedance of 3 GOhms in the 60mV and 600mV ranges. Really good meters have a way to switch input impedance to a defined reasonably low value to avoid this.

author: Macbeth
author_rank: Super Contributor
timestamp: October 28, 2014, 10:22:24 pm
content: Try an oscilloscope left free running without its probes connected - there is 50 (or 60Hz) everywhere getting into it and shown as a sine wave. That same stuff is getting into your unterminated meter probes too... and OMG IT IS FRYING YOUR BRAIN! NO WONDER TIN FOIL HATS ARE SO POPULAR!
Rigol DS2072A termination issue - Page 1
Forum section: electronics / testgear

author: SharpEars
author_rank: Unknown
timestamp: October 24, 2014, 02:40:12 pm
content: When I change the internal termination from 1 MOhm to 50 ohm and try to measure a DC voltage of 5V using the included 10X probe (with the scope itself properly configured for 10X and 5V per division), I am getting a reading of zero volts. The 1 MOhm setting is working correctly and showing the full 5V. What could be causing this issue?

author: coppice
author_rank: Super Contributor
timestamp: October 24, 2014, 04:00:05 pm
content: Quote from: SharpEars on October 24, 2014, 02:40:12 pm50/9000050 is a pretty small multiplier. Its hard to distinguish a signal that small from none at all.

author: SharpEars
author_rank: Unknown
timestamp: October 24, 2014, 08:53:43 pm
content: Quote from: coppice on October 24, 2014, 04:00:05 pmI don't understand. I thought that the 50 ohm termination would have just placed a 50 ohm load on the voltage source I was measuring, but still measure correctly on the scope voltage wise assuming that the voltage source was not severely impacted by the 50 ohm load (i.e., could easily source 100 mA).

author: wraper
author_rank: Unknown
timestamp: October 24, 2014, 09:11:29 pm
content: Quote from: SharpEars on October 24, 2014, 08:53:43 pmIf you would use just a coax cable instead of the probe, that would be true. Did you forget that it is 10:1 probe? It don't divide voltage by miracle. 10:1 probe have 9 MOhm resistance which combined with 1 MOhm input resistance results in 10 MOhm total input resistance with 10:1 dividing coefficient. When you activate 50 OHm termination, total input resistance will become 9M of probe resistance + 50 OHm of oscilloscope input resistance. Therefore you make a voltage divider with10M9M and 50R resistors. So you just made a200 000:1180 000:1 probe.

author: SharpEars
author_rank: Unknown
timestamp: October 24, 2014, 09:21:03 pm
content: Quote from: wraper on October 24, 2014, 09:11:29 pmDUH, I am a big idiot!

author: wraper
author_rank: Unknown
timestamp: October 24, 2014, 10:23:32 pm
content: Btw, don't play with termination resistor. It isn't of some infinite power type, just SMT. Easy way how to damage your oscilloscope by applying larger voltage to the input.

author: Mark_O
author_rank: Frequent Contributor
timestamp: October 24, 2014, 11:03:59 pm
content: Quote from: SharpEars on October 24, 2014, 09:21:03 pmDon't feel too bad. You could be the guy doing the "who's doin' dat?" ads for Teledyne on their LeCroy scopes.Now that would be arealreason for hanging your head in shame and humiliation.

author: miguelvp
author_rank: Super Contributor
timestamp: October 25, 2014, 03:57:02 am
content: Like wraper mentions, don't play with the internal termination, purchase a t-connector and and external 50 Ohm terminator.It just takes one time that you are in a hurry and forget you left the internal termination set to 50 Ohms and ruin your day the next day when you think it was set to 1Meg.
Old GE Meters - Page 1
Forum section: electronics / testgear

author: ShawnD
author_rank: Contributor
timestamp: October 25, 2014, 05:17:14 pm
content: Does anyone know how old these are?I bought them from a surplus sale at University in the 90's to get an ammeter with an amps range (My multimeter at the time only went to 200mA). I think I paid 25¢ each for them.They are labelled Type DP-9. The voltmeter is model BDP9VBC1 (3/15/150 VDC) and the ammeter is BDP9ACD1 (1/2.5/10A DC). They both work and are still accurate compared to a $25 multimeter. The voltmeter is low resistance (600?/3002?/30020?), 200?/V. The ammeter burden voltage is 54mV at 1A on the 1A scale.I love the safety of 150V on an exposed binding post.I has to take the cover off the voltmeter to fix the zero adjustment so snapped a few pictures of the insides too.

author: radhaz
author_rank: Regular Contributor
timestamp: October 25, 2014, 05:52:19 pm
content: Very cool meters. I'm guessing 1940's vintage.
Is readout compatible between scope manufacturers? - Page 1
Forum section: electronics / testgear

author: alank2
author_rank: Super Contributor
timestamp: October 20, 2014, 11:49:06 pm
content: I see a lot of probes with a "readout" pin on them to set the 10X, etc. Did they just choose a resistance that was 10X for example?Is this compatible between scopes (tek, hp, rigol, etc.)?

author: alex.forencich
author_rank: Frequent Contributor
timestamp: October 24, 2014, 05:06:56 am
content: Quote from: alank2 on October 20, 2014, 11:49:06 pmYeah, there are standard values for the readout pin resistor. All 10X probes should have the same resistor value, for example. I think it is 10 or 11k.

author: David Hess
author_rank: Super Contributor
timestamp: October 25, 2014, 03:03:12 pm
content: At least for the standard x10, x100, and x1000 values I think they are all the same. Some of the later values which were introduced might have varied between manufacturers.As far as I know, the original standard came from Barry Gilbert when he designed the readout for the Tektronix 7000 series where the probe readout resistance directly alters the 1 of 10 encoded current into the analog readout generator. It is possible to go though his design to calculate what the resistor values should be.
Fluke 8125A - Page 1
Forum section: electronics / testgear

author: Wytnucls
author_rank: Super Contributor
timestamp: October 25, 2014, 10:37:15 am
content: Here is one for the toolbox. 20g impact tested!For sale in Singapore.This is a ruggedized version of the commercial 8110ASeems expensive. Is it rare?http://www.ebay.com.sg/itm/FLUKE-8125A-Digital-Multimeter-in-Military-Case-/200400129870?pt=LH_DefaultDomain_0&hash=item2ea8c74f4e
Tektronix 2445B No Readout Display - Page 1
Forum section: electronics / testgear

author: tec5c
author_rank: Frequent Contributor
timestamp: October 25, 2014, 06:47:00 am
content: Hi all,I recently got given a Tek 2445B with the fault description "No display" I ran it thinking that it meant no display at all and it was displaying the traces fine. I then tried to turn on the readouts and haven't been able to get them up.Is there anyone here with knowledge of this bit of gear that has seen this fault before or would know of some places to check? I'm hoping it's not a discontinued IC at fault here...Thanks in advance.Edit: This is probably more suited to the 'Repair' section of the forum. My mistake.

author: tautech
author_rank: Super Contributor
timestamp: October 25, 2014, 07:05:14 am
content: Check out the very first post in the Repair board for the TEK scope repair pdf.
Which distributor for Agilent "Ultimate Scope Upgrade" - Page 1
Forum section: electronics / testgear

author: motocoder
author_rank: Unknown
timestamp: October 24, 2014, 01:48:05 pm
content: I've just purchased one of Agilent's "Used Premium" scopes off of eBay. I want to take advantage of their Ultimate Scope upgrade program where you get all the software upgrades for the price of one. I went to Agilent's web site to complete this, and they gave me a list of distributors to use to for the purchase. I was wondering if people could recommend a distributor. Since it's likely I'll use them again for accessory purchases or what-not, I'd like to pick one that I'll be happy with.Here is the list:Gap WirelessTranscatTESSCOTechni-ToolNewark element14MicroleaseAllied ElectronicsTestEquity

author: Terabyte2007
author_rank: Frequent Contributor
timestamp: October 24, 2014, 02:09:30 pm
content: I went with TestEquity for my Agilent scope upgrade. They had the eLicense processed and sent to me in about 2 hours. A few days later the certificate arrived by FedEx.

author: motocoder
author_rank: Unknown
timestamp: October 24, 2014, 02:14:10 pm
content: Quote from: Terabyte2007 on October 24, 2014, 02:09:30 pmDid you need to provide the scope serial number? I'm just paying for the scope today, and Agilent is going to ship it from Malaysia I think, so it might not be here for awhile. I'm a bit worried about the "Ultimate Scope Upgrade" program ending before I have the scope in hand.

author: LabSpokane
author_rank: Super Contributor
timestamp: October 24, 2014, 10:27:22 pm
content: You don't need the serial # until you register the option with agilent. Got mine at testequity. Good service.

author: motocoder
author_rank: Unknown
timestamp: October 25, 2014, 01:34:14 am
content: Quote from: LabSpokane on October 24, 2014, 10:27:22 pmThanks. I placed an order with them today. I called them after I got an email reply, but had to leave a message for the guy. However, I was impressed that I got several call backs to make sure I had been taken care of, including a later follow-up from a very knowledgeable local rep.

author: ConKbot
author_rank: Super Contributor
timestamp: October 25, 2014, 02:07:38 am
content: Newark was good when I ordered the scope and some upgrades originally. Though when I purchased *Just* and upgrade, I got nothing, no emails, no confirmations, it showed up on the website as 'completed' I had to call newark with a "wtf its just an email, why is this taking so long" and an agilent rep emailed me the entitlement cert.
HP 83480A Digital Communications Analyzer Teardown - Page 1
Forum section: electronics / testgear

author: TerraHertz
author_rank: Super Contributor
timestamp: October 30, 2014, 11:00:28 am
content: http://everist.org/NobLog/20141029_HP83480A_teardown.htmThe thing ended up on my bench a lot sooner than I'd expected.

author: PA0PBZ
author_rank: Super Contributor
timestamp: October 30, 2014, 12:02:12 pm
content: The "Power Statistics" really made me wonder at first, but it was probably reset together with the RTC.

author: TerraHertz
author_rank: Super Contributor
timestamp: October 30, 2014, 01:53:35 pm
content: Quote from: PA0PBZ on October 30, 2014, 12:02:12 pmActually that pic was from when I first turned it on after unpacking. I'm curious about those numbers too, and why the date/time was so wrong. The 'length last Poff' might be right, 'time since Pon' is correct, but the 'total Pon time: 13.67hrs' has to be garbage. Wrapped around maybe?Power cycles = 15 is hard to believe too.As I play with it, I'll be watching for any sign that the thing is crashing, and maybe corrupting memory where it keeps values like those. So far, it's been solid. Except for when I fed it a bad floppy disk, and the disk access code seemed to get hung up on whatever was wrong with the floppy.
TTi MX100T - Page 1
Forum section: electronics / testgear

author: Circuitous
author_rank: Unknown
timestamp: October 24, 2014, 02:39:15 am
content: I'm thinking about getting a new power supply, and the TTi MX-100TP looks nice. 3 separately isolated outputs, various power output configurations. Does anyone have experience with this model?http://www.aimtti.com/go/mx/index.htmI've searched for reviews, but haven't found anything.

author: Rufus
author_rank: Super Contributor
timestamp: October 24, 2014, 12:26:23 pm
content: Quote from: Circuitous on October 24, 2014, 02:39:15 amBrand new product so hardly anyone will have seen one yet.Looks like something intended to beat the Rigol DP83x range and probably worth the price premium.

author: electronic_eel
author_rank: Regular Contributor
timestamp: October 24, 2014, 09:00:14 pm
content: TTi make really decent power supplies, but I don't have experience with this model. They are one of the few companies left who publish full schematics in their service manuals. Don't know if for this model, but I've got a QPX1200 and that has full schematics. You have to ask their tech support to get the service manual though, but I got it right away.Note that it is not an all-linear design, but a switch mode supply with a linear postregulator. That will work well for all kinds of digital electronics and simple analog stuff. But this design usually has slightly higer ripple and noise, so I wouldn't recommend it for high precision / low noise analog circuits.If you are looking for an all-linear design, I'd recommend their QL-P series.

author: KJDS
author_rank: Super Contributor
timestamp: October 24, 2014, 09:02:28 pm
content: I've sold hundreds of their earlier models, but haven't seen this one. Their more recent workings are far better constructed than the early ones.
Need Potomac AG-51 Audio Generator Manual - Page 1
Forum section: electronics / testgear

author: Dawn
author_rank: Regular Contributor
timestamp: October 25, 2014, 12:18:12 am
content: Would anyone have a scan of this audio generator used heavily in broadcast? I do have the docs on the companion AA-51 THD/IM distortion analyzer/wow/flutter meter if anyone needs a copy.I sure can use a manual on one of these.TIAdwt
Tektronix 1230 Logic Analyzer Review  - Page 1
Forum section: electronics / testgear

author: mdanh2002
author_rank: Contributor
timestamp: October 23, 2014, 05:21:36 pm
content: Hi,I purchased a Tektronix 1230 Logic Analyzer from eBay almost a year ago. Took a few months for me to find the proper probe (P6444) for a reasonable price from eBay. I spent some time playing with the logic analyzer capabilities and wrote a full review of the unit here:http://minhdanh2002.blogspot.sg/2014/10/tektronix-1230-logic-analyzer.htmlThe article also describes a tool that I wrote to emulate a parallel port printer so that screenshots and memory dump can be retrieved from this logic analyzer, which only has parallel and serial port interface.At 2K data points memory size with up to 64 input channels (mine only has 16 channels as I only purchased 1 P6444 probe), I must say that this device is still very useful nowadays to debug older 8-bit designs, such as the Z80 processors.Interestingly, this logic analyzer can also interpret captured data as ASCII. I managed to make it display "Hello World" in the captured data by outputting the string to an entire port on a PIC microcontroller and using the synchronous timebase to capture the output.The device also has monochrome composite video output, which displays just fine on my CRT TV and LCD monitor.Some screenshots of the logic analyzers, the probe's internal circuit board and the video output are attached to this thread.Let me know what you think of my review
Comparison of the Flir TG165 and the Fluke VT04 - Page 1
Forum section: electronics / testgear

author: tequipment
author_rank: Regular Contributor
timestamp: October 21, 2014, 04:40:51 pm
content: http://www.tequipment.net/Fluke-VT04-vs-Flir-TG165-Thermal-Imager-IR-Camera/This is a rough draft. What would you guys add or change? I didnt proof the grammar yet.ThanksEvanTEquipment.NET

author: zapta
author_rank: Super Contributor
timestamp: October 21, 2014, 08:00:38 pm
content: What's the flir warranty if not registering within 60 days?

author: tequipment
author_rank: Regular Contributor
timestamp: October 21, 2014, 09:37:32 pm
content: 2 years. 10 years on the detector when its registered.

author: tequipment
author_rank: Regular Contributor
timestamp: October 23, 2014, 02:28:36 am
content: We just made a few more changes. More to come tomorrow then the page should be pretty set.
10 turn pot on an Instek GFG-8255A - Page 1
Forum section: electronics / testgear

author: Helder22
author_rank: Contributor
timestamp: October 23, 2014, 01:52:49 am
content: I just received an Instek GFG-8255A I got off ebay. It's a little beat up but the price was ok. Was testing it today and noticed it is nearly impossible to get a specific frequency out of it in some of the ranges because it's extremely touchy.Has anyone here ever substituted the stock pot for a 10 turn pot. I imagine it should be rather simple but just a noob at this so it would be good to hear someone with more experience.
Vitiny DIGI Microscope UM06 / UM08 - Page 1
Forum section: electronics / testgear

author: ploppity
author_rank: Newbie
timestamp: October 22, 2014, 06:27:50 pm
content: Although I'd love a microscope like Dave has strapped to his desk, I can't afford it.However, walking around a recent fair, I found the one in the subject line which appears to have decent specs and is much cheaper (< $1000).Thinking of the UM06 one as it has both HDMI and USB, so hopefully would be able to use a monitor for output plus take stills on a PC.Thing is, has anyone used one? Do you think they are any good?I'm not going to post a link just in case someone/something thinks I'm spamming. You can find it via google
eC-test-mate - Page 1
Forum section: electronics / testgear

author: fcb
author_rank: Super Contributor
timestamp: October 21, 2014, 09:29:05 am
content: This looks VERY interesting. Wonder what the price is???

author: jc101
author_rank: Frequent Contributor
timestamp: October 21, 2014, 04:58:38 pm
content: From a recent communication from them..."It will be available to order after Electronica in November 2014."...might get a look at it at a show later this week. If I hear anything I'll update this.

author: fcb
author_rank: Super Contributor
timestamp: October 22, 2014, 06:25:17 pm
content: Thanks jc101,I think it could be very interesting especially if it has some outputs. Could provide a neat solution between JTAG and ATE.
Replacing the internal memory battery on a Anritsu MS2626A Spectrum Analyser. - Page 1
Forum section: electronics / testgear

author: bigfathairybiker
author_rank: Newbie
timestamp: October 21, 2014, 07:58:43 pm
content: Hi All,Although I probably can easily do this myself, I am asking if anyone has replaced the internal battery themselves as the manual says that it should be done by the factory.This makes me think that I may loose calibration or other important data.Or am I being overly cautious?Thanks,Mark

author: radhaz
author_rank: Regular Contributor
timestamp: October 22, 2014, 02:48:46 am
content: I'd exercise caution and wait for some definitive input from the knowledgeable members.

author: tautech
author_rank: Super Contributor
timestamp: October 22, 2014, 04:17:28 am
content: Quote from: bigfathairybiker on October 21, 2014, 07:58:43 pmWelcome to the forum.What sort of battery is it? coin cell? tubular battery? voltage?Others will know good sources for quality batteries, but put your country flag in your profile for local recommendations.From posts I have seen for other gear, caution is the way to go.Most use an external PSU set to battery voltage while changing the battery, but to be safe you might also consider powering it from an UPS in case of lost power while the battery is out.Also ensure a good connection to the battery tracks, preferably soldered on to prevent disconnection.
DS2072A upgrade/unlock firmware link no longer works - Page 1
Forum section: electronics / testgear

author: pepperm
author_rank: Newbie
timestamp: May 07, 2014, 01:41:56 pm
content: Hi AllI have recently purchased a DS2072A and would like to upgrade to have all of the capabilities that the hardware has, particularly the serial protocol analysers. Reading through the posts suggests that this is possible and required some special firmware loading first followed by the use of some utilities to generate keys or something to allow the unlocking.The problem is that the initial special firmware isn't available any longer on megadownload or wherever the link goes to athttps://mega.co.nz/#!FFk10SCY!UuWPXyqZwmca00pa2clOth1ryh1Z-AAgJg2yibfoUw0it would seem (it says the file is no longer available) so can anyone point me at a location where I could get a copy please?Mark

author: Nerull
author_rank: Frequent Contributor
timestamp: May 07, 2014, 09:44:02 pm
content: You can also get it here:http://www.gotroot.ca/rigol/Its the file called DS2000(DSP)update_00.02.01.00.03 (license keys dump).zipThe D2072A Unlocking Guide.pdf in the same folder is also very helpful. The rigup program is in there as well.

author: pepperm
author_rank: Newbie
timestamp: May 08, 2014, 06:26:23 am
content: Thanks NerullI'll give that a try, note that Chrome throws up malware warnings on rigup-0.4.zip and the DS2000 upgrade utility.

author: SharpEars
author_rank: Unknown
timestamp: October 23, 2014, 01:55:13 pm
content: Once you're done installing the keys, don't you need to revert back to your original firmware version? If so, where do you get the GEL file for that?
Tektronix THM500 series TekMeter ribbon cable sourcing (?) - Page 1
Forum section: electronics / testgear

author: YashEE
author_rank: Newbie
timestamp: October 19, 2014, 01:08:26 pm
content: I recently acquired a two channel portable scope meter (model THM571) made by Tektronix (ca 1996) that has a ribbon cable (touch switch type) that was damaged from a battery leak and needs replacement.Can these be still sourced -I think all THM500 Tek Meters use the same cable (?)Thanks.
Yokogawa 2553 Voltage DC Calibrator - Page 1
Forum section: electronics / testgear

author: dr equipment
author_rank: Newbie
timestamp: October 19, 2014, 02:26:00 am
content: Hi,Anybody have the manual, service or any information about the Voltage DC Calibrator Yokogawa Type 2553?Appear be a great equipment, but the Yokogawa not provides any information about it.Thanks
[Ersa i-Con PICO] Using soldering iron with own DIY station - Page 1
Forum section: electronics / testgear

author: ivandevel
author_rank: Newbie
timestamp: October 13, 2014, 06:10:13 am
content: Hello! I've bought a new i-Con PICO soldering iron, it's awesome! I want to make my own PID station for this solder. I have discovered a pinout (in attachment) Can anyone, who have this station, make a probe with oscilloscope or logic analyser between green and yellow wires? I think that there is an one-wire IC embedded in soldering iron ... A heater module of this iron consists of a termocouple and a ceramic iron.

author: ivandevel
author_rank: Newbie
timestamp: October 16, 2014, 05:01:55 pm
content: up

author: Creep
author_rank: Regular Contributor
timestamp: October 16, 2014, 05:29:47 pm
content: Going a little off the topic but:Where did you buy the iron itself? I have the station but the heating element on my iron seems to have died...

author: Yago
author_rank: Frequent Contributor
timestamp: October 16, 2014, 05:34:56 pm
content: Ersa shop:http://www.ersa-shop.com/
backlit meter viewing angle - Page 1
Forum section: electronics / testgear

author: cncjerry
author_rank: Unknown
timestamp: October 16, 2014, 06:54:15 am
content: I've been on a meter kick lately as I needed higher degree of accuracy plus my project has a number of power supplies that need to be monitored. This led me to wanting a new backlit meter but wanted to try it out before going overboard. I bought a Fluke 115 at Sears for $119 with leads and manual. I noticed that the display looks best with/without backlight from an angle where the meter is held flat in your hand, not slightly rotated so your view would be perpendicular to the plane of the meter face. At first I thought this was a defect and now I'm not sure. I have another backlit meter and it acts the same way (e.g. the meter contrast is best looking at it from about 70 or less degrees opposed to 90). Not to put to fine of a point on it, but if you lay the meter flat on a table and look at it, the contrast is superb. But it you lean it on the back stand, it looks ghostly. Both meters, two different manufacturers. So is this common?

author: VK5RC
author_rank: Unknown
timestamp: October 16, 2014, 08:01:53 am
content: I agree lcd can be at times frustrating, whenever I am using a dmm, stuff is usually all over the place, and position of the dmm is not on my mind. I have one of Agilent /Keysight OLED dmm and have been very happy with its really good viewability. Some people have raised issues of oled life span, but so far mine(U1253b) is going well. Agilent know how to charge though!

author: Fungus
author_rank: Super Contributor
timestamp: October 16, 2014, 08:42:41 am
content: LCDs have a limited viewing angle, yes.Do they optimize it for the most common usage pattern? Of course they do.You can get meters with other display types but they're expensive, often can't be seen outdoors, and the batteries need changing every few days (if you use the meter a lot).

author: cncjerry
author_rank: Unknown
timestamp: October 16, 2014, 02:28:54 pm
content: I went back and found a reference in the specifications for the Fluke that said the 'viewing angle' was 70 degrees. I equated that with the typical TV angle thinking they mean side to side peripheral viewing angle. Now I am starting to think it refers to the angle at which it is tuned for viewing? Anyway, I agree with the poster about things being all over the place while debugging and the only reason I didn't buy the fluke with detachable meter face is I would end up packing it away in the DUT like a surgical sponge. Where do all my test leads go anyway?
Rigol DSA-815 front panel cover. - Page 1
Forum section: electronics / testgear

author: geggi1
author_rank: Frequent Contributor
timestamp: October 16, 2014, 09:30:30 pm
content: I have been looking for a front panel protective for for my DSA 815.Does anybody know if the cover for the 10xx seris wil fit?

author: Hugoneus
author_rank: Frequent Contributor
timestamp: October 16, 2014, 09:38:36 pm
content: Quote from: geggi1 on October 16, 2014, 09:30:30 pmNo, I do not think it fits. The 1000 series have a larger overall dimension.