hybridfree/eevblog-posts huggingface dataset:
Rigol dp832 is giving mild shock at the test leads - Page 1
Forum section: electronics / testgear

author: SHARANYA
author_rank: Contributor
timestamp: January 22, 2018, 11:11:47 am
content: Dear expertsI recently bought a Rigol DP832.Everything was fine about the supply until today.While working today on bare foot,I accidentally touch the test leads at the back of my palm and felt some tingling feeling(At that time,all the supply outputs were "OFF").So i attached a electrical tester to the output test leads and the light was glowing!!!!I received a two pin power cord with the power supply which has no Earthing pin(Schuko type).So I replaced the cord with a 3 pin cord and this time I tested with the electrical tester & the light was not glowing(Also No tingling sensation at the back of my palm).I attached the dafault cord again and measured resistance(One of my fluke lead to one output lead of the supply & the other fluke lead to one of the input pin of the power cord ) for both Live & Neutral pin of the power cord.But each time,the meter showed "OL".So my question,Is this normal or something is wrong with my supply??Any help is appreciated.

author: 0xfede
author_rank: Regular Contributor
timestamp: January 22, 2018, 11:31:42 am
content: Hello SHARANYA,I don't have a RIGOL DP832 but IMHO seems normal that a non grounded device gives a small shock when touching its leads.Moreover in Europe it is forbidden to have a metal chassis device without earth connected.What puzzle me is that the stock cable was without ground connection, what are they thinking?Best,0xfede

author: stj
author_rank: Super Contributor
timestamp: January 22, 2018, 12:02:20 pm
content: schuko plugs have earth, it's just not a pin - it's recessed contacts that engage with clips in the socket.

author: SHARANYA
author_rank: Contributor
timestamp: January 22, 2018, 12:05:26 pm
content: @0xfedeYou just saved my day.What a relief!!The stock cable is Schuko type.In India,we don't use that kind of connector so the Earth connector of the stock cable is not getting connected to the Earth pin of the power socket.I just found some adapter in the internet and today I will order them.Again,thanks a lot everybody for your time & response....

author: 0xfede
author_rank: Regular Contributor
timestamp: January 22, 2018, 12:08:26 pm
content: Quote from: stj on January 22, 2018, 12:02:20 pmIt is my understanding that the OP means that the plug completely miss the earth tab or am I wrong?Turns out that I'm wrong....
Fluke connect app + 376 FC - Page 1
Forum section: electronics / testgear

author: gearshredder
author_rank: Contributor
timestamp: January 22, 2018, 01:44:26 am
content: I didn't see much about the Fluke connect app or a 376FC meter so I make a new topic. I didn't have an amp clamp, and the wireless feature would be very useful to me. But, it seems that the Connect app kinda sucks. Should I keep this or is the Extech EX850 any good? I'd buy the U1213a but the optical to wireless adapter seems hard to get. The Flir CM85 or the Extech EX845 Looks good as well but I'm currently looking into how the Meterlink app works. Compatability list doesn't look any better.The app btw doesn't work with the OnePlus 5 right now, I have to reinstall it to get it to connect to the meter every time. It doesn't say it's supported but I took a gamble on it just being that they didn't have the phone to test it with. I guess not. I might have to buy an old phone on their list and throw it in the bag... lol
Looking for 4+ output Rack Power supply (Kepco ATE?) - Page 1
Forum section: electronics / testgear

author: iampoor
author_rank: Frequent Contributor
timestamp: January 21, 2018, 04:38:38 pm
content: HelloI am looking for a 4 (or more) output 3u or 4u rackmountable power supply.My reuqirements are pretty open.-I need it to be a low noise linear output (I deal with sensitive audio circuitry, and think a low noise switch-mode supply is probably far out of my price range)-Low fan noise/adjustable fan speed. Dont want a loud power supply if Im only drawing a couple of watts.-Preferably serviceable/documentation available-I would like like to be able to get up to +-75v @ a couple of amps total, in a series/parallel configuration.-I would like to have atleast +-24 output capability per output.-CHEAP (My username says it all.). I live close to the bay area and have access to a wide range of industrial surplus for local pickup on EbayIf anyone in the bay area has something that would fit these requirements, please feel free to send me a message.So far I have narrowed it down to the KEPCO ATE series. I can get 4 36v 0-3amp modules for a VERY good price. But one question remains...how loud are the fans? Does anyone have any direct experience with these modules?Thanks!
Recommendation for test leads for Aneng 8008 from Aliexpress ? - Page 1
Forum section: electronics / testgear

author: ez24
author_rank: Super Contributor
timestamp: January 21, 2018, 05:59:17 am
content: HiThe leads that come with the 8008 get warm at 3 amps, really warm at 4 amp, and hot at 5 amps. I am afraid to go higher but would like to get to 10a without a risk of fire.Does anyone have a source of leads that can do 10a that is reasonable on Aliexpress?But now that I am asking - can the 8008 run at 10 amps?thanks

author: JohnPen
author_rank: Regular Contributor
timestamp: January 21, 2018, 09:49:50 am
content: Probably not for long! Swap over to a UT210E.

author: Fungus
author_rank: Super Contributor
timestamp: January 21, 2018, 11:20:36 am
content: Quote from: ez24 on January 21, 2018, 05:59:17 amNot for very long. Maybe 10-20 seconds without needing a rest to cool down.nb. This applies toallmultimeters, even Flukes. It's the reason they make current clamps like the one suggested in the previous post.

author: Fungus
author_rank: Super Contributor
timestamp: January 21, 2018, 11:33:43 am
content: The AN8008 comes with two sets of leads.I just did a quick test and the DIY screw-together leads seem to be better than the fixed ones (lower resistance).

author: stj
author_rank: Super Contributor
timestamp: January 21, 2018, 01:04:10 pm
content: your leads are faulty,the aneng leads where tested by joeqsmith and performed well.
In circuit ESR meter - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: January 20, 2018, 11:16:31 pm
content: What are good options for an ESR meter that can check caps in circuit? Is it worth getting a specific ESR meter or is a DMM with ESR cheaper/as good?I've seen some VERY cheap ESR meters advertised but I'm a little sceptical about a £6 meter including delivery!

author: Cliff Matthews
author_rank: Unknown
timestamp: January 20, 2018, 11:30:31 pm
content: Peak was offering 20% off to forum member a few months ago. Don't know if it ended yet..https://www.eevblog.com/forum/buysellwanted/special-offer-to-eevblog-forum-members/

author: Electro Detective
author_rank: Super Contributor
timestamp: January 21, 2018, 01:26:31 am
content: I suggest to get a proper meter that specialises in ESR only.It's an expensive 'one trick pony' cash outlay, but will pay for itself in no timeJust don't let the batteries leak in it, or connect it to charged capacitorsThose all in one LCR meters with bonus ESR feature seem like a good deal, but may be too fiddly to set up and or not quite up to the task of serious ESR troubleshooting,and a decent LCR rig isn't going to be cheap anyway.I got the Peak Atlas ESR70 because of good reviews, small size, automatic sense and discharge, pre-checking new and NOS capacitors,and it serves as a handy low ohm meter tooFWIW a decent LCR meter is on my wish list too, but not for any ESR functions

author: rhb
author_rank: Super Contributor
timestamp: January 21, 2018, 01:42:52 am
content: I bought a Peak which seems quite satisfactory. But don't expect to read ESR in-circuit. You'll need to desolder on leg for reliable results in most cases.
Rigol 1054Z cheaper - Page 1
Forum section: electronics / testgear

author: JanJansen
author_rank: Frequent Contributor
timestamp: January 20, 2018, 04:37:25 pm
content: https://www.tequipment.net/Rigol/DS1054Z/Digital-Oscilloscopes/?v=7401The Rigol cost now only 350,- in USA, and you get all option for free without hacking,why not in EU for 350,- ?Will there be a replacement soon ?, or does Rigol only make expensive scopes now ?Anyone know EU dealer for 350,- with all options ?thanx

author: 2N3055
author_rank: Super Contributor
timestamp: January 20, 2018, 04:49:47 pm
content: Anywhere I took a look it was 330 -340€ (no VAT) with all options included....https://www.batterfly.com/shop/rigol-ds1054zhttps://www.batronix.com/shop/oscilloscopes/Rigol-DS1054Z.htmlhttps://eleshop.eu/rigol-ds1054z.htmlhttps://www.meilhaus.de/en/rigol+ds1054z.htm

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: January 20, 2018, 04:56:59 pm
content: Still, $350 are about 286€ which results in 340€ including 19% VAT.Anyway, it's not like this is a new phenomenon. European prices are typically much higher than US prices even considering VAT.

author: JanJansen
author_rank: Frequent Contributor
timestamp: January 20, 2018, 05:05:22 pm
content: Oh i forgot, its prices without VAT in USA.Sorry, they told me before on this forum.Anyone know if Rigo will release a newer version of this cheapest 4 channel scope ?
HP8644A PLL and FLL errors - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: January 19, 2018, 04:17:40 am
content: I have an HP 8644A that displays the following error intermittently.Trans VCO FLL OOLNF PLL OOLThey usually happen when I make frequency excursions relatively fast. Mssg indicator comes on and those are what gets displayed. Other than this though, the unit itself appears to be functioning. Oddly enough, I went through every manual I can find online and there are no mention of these errors.Has anyone seen these?

author: tkamiya
author_rank: Super Contributor
timestamp: January 19, 2018, 04:58:33 am
content: By the way, I just did the self-test and it concluded with result = 0. It passes self-cal also.

author: Tony_G
author_rank: Super Contributor
timestamp: January 19, 2018, 04:48:10 pm
content: I can only find one reference to this one the HP Yahoo Group - In that case the A8 board was missing.Maybe it is related to the power rails sagging? Trying hooking a scope up to the rails and seeing if you can reproduce the error.TonyG

author: tkamiya
author_rank: Super Contributor
timestamp: January 20, 2018, 03:00:33 pm
content: That's just it.... not much info on the Internet.I'll check the power supply just in case. Unfortunately, reliable reproduction is not possible. It happens after a while, immediately, at all frequencies, and after lunch and dinner. I hate intermittent issues.
Grades of Multimeters - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: January 20, 2018, 06:09:55 am
content: Here is my idea for informal Grade of multimeters based on their use and robustness.Grade D: These are multimeters that should only be used to check household batteries and work on battery powered equipment. An example of this would be the free Harbor Freight Centech multimeter.Grade C: These are multimeters that should be used on voltages below line level (120V) and low current demands like consumer electronics.Grade B: These are multimeters that should be used on line voltages (120V/240V) such as house wiring.Grade A: These are multimeters that can be used on high voltages (up to 1000V) such are found in industrial applications and tube amplifiers. Many Fluke meters such as 87V fit into this category.I know this is a very rough rule of thumb but what do you think?

author: Fungus
author_rank: Super Contributor
timestamp: January 20, 2018, 06:36:21 am
content: So...Basically the same as the CAT ratings everybody's already using?(but without the voltage spec)

author: tautech
author_rank: Super Contributor
timestamp: January 20, 2018, 06:42:53 am
content: Quote from: Axtman on January 20, 2018, 06:09:55 amAlready been done and some meters don't fall into the grades that you think.https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/CAT ratings are one thing, robustness is another.

author: Muttley Snickers
author_rank: Unknown
timestamp: January 20, 2018, 07:03:22 am
content: I think the whole concept is pointless, it's another list of categories that people would need to refer to and manufacturers certainly wouldn't bother implementing such a thing. Furthermore, any moron could still kill him or herself with your "Grade A" quality meter simply through improper practices and an experienced user could also safely measure three phase or higher voltages with your lesser "Grade D" gadget, not that they would but they could.
LeCroy WaveSurfer doesnt zoom when decreasing horizontal scale - Page 1
Forum section: electronics / testgear

author: yoko911
author_rank: Newbie
timestamp: January 19, 2018, 02:51:31 am
content: Hello,I have never used a LeCroy Scope, now Im using a WaveSurfer 3034, I love it, Im currently using it for mixed signal analysis, but i've been wondering if this cant be done or if I have something not correctly configured, when capturing a signal like this:When I'm decreasing the horizontal scale (zooming in), only the analog signal zooms, the digital stays there.Am i doing something wrong?, or just the way this scop works?Thank you

author: bson
author_rank: Unknown
timestamp: January 19, 2018, 03:34:19 am
content: It'll change with the timebase like analog signals, but you're running on a normal trigger so it may not update until the next trigger, or you may need to stop the update.

author: tautech
author_rank: Super Contributor
timestamp: January 19, 2018, 03:52:24 am
content: Quote from: bson on January 19, 2018, 03:34:19 amYep, 'waiting for trigger' in red on the bottom of the display is the indicator you need to change settings.Try Auto trigger.

author: free_electron
author_rank: Super Contributor
timestamp: January 19, 2018, 04:27:34 am
content: Are you using that MS500 digital head ? ship it back and get your money back. That has NEVER worked right ....you can actually get in a mode where it loses synchronisation between analog and digital traces. or get the zoom section to display a different area than the cursors show ...i lost days debugging a system becasue this thing is defective. Lecroy did not design that probe head. they bought it and integrated the driver into their scopes.

author: abraxa
author_rank: Frequent Contributor
timestamp: January 19, 2018, 07:11:52 am
content: Quote from: free_electron on January 19, 2018, 04:27:34 amIf I'm not mistaken, the WS3k series doesn't support the MS250/MS500 because they don't have the LeCroy Bus connector. Do you know who made the MS250/MS500, btw? I'm curious.@yoko911: I wonder if the same bug exists on the Siglent models as well since the WS3k is just a rebranded Siglent.

author: JPortici
author_rank: Super Contributor
timestamp: January 19, 2018, 08:14:18 am
content: the WS3K DOES have the probus connector!if you are using zoom mode instead of expanding the timebase it's possible that you are zooming in on one channel only, the analog channel. I tested this scope for about a week a while ago and i recall something like this happened..

author: abraxa
author_rank: Frequent Contributor
timestamp: January 19, 2018, 12:58:49 pm
content: Quote from: JPortici on January 19, 2018, 08:14:18 amhttps://asset.conrad.com/media10/isa/160267/c1/-/de/1234446_BB_07_FB/digital-oszilloskop-lecroy-wavesurfer-10-1-ghz-22-kanal-5-gsas-10-mpts-8-bit-digital-speicher-dso.jpgThe MS-250/MS-500 need the L-Bus connector, which the WS3k doesn't have as far as I'm aware. That's the one I was refering to.
Agilent E3634A output voltage after power off - Page 1
Forum section: electronics / testgear

author: wictor
author_rank: Regular Contributor
timestamp: January 19, 2018, 06:51:07 pm
content: Hi!I have E3634A power supply and it's working fine during normal use. But when I power it off, output voltage starts rising and can easily go up to 10 volts(measured by DMM without load). This could potentially break some device if it is not disconnected. I guess this is not normal and I would like someone to test with similar unit, how it behaves.Thanks,Wictor
The 'TDGC2-2K' 2000VA Variac - any good? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: January 19, 2018, 03:49:08 pm
content: There's a ton of these on eBay but this ad has decent sample images:https://www.ebay.com/itm/Variac-Transformer-Variable-AC-Voltage-Regulator-Metered-Auto-20A-110V-2000Watts/322916450019?epid=633015955&hash=item4b2f51fee3:g:5poAAOSwTmtaIb5nDoes anyone here have experience with it? Good/bad?I have to assume that 2KVA rating is "somewhat optimistic". But has anyone actually used it at, say, a 1KVA level? That would be good enough for me, and it's fairly cheap, so...Thanks!

author: MarkL
author_rank: Unknown
timestamp: January 19, 2018, 04:44:23 pm
content: I have one of those 2kVA, no-name, made in China variacs. It's not the exact one you're pointing to, but it looks identical. I was working with a 15A load (1.8kVA) when the wiper arced and it internally caught on fire. The fuse never blew.I wouldn't trust them with any amount of current. I'd recommend finding one from Staco or other reputable manufacturer instead. Used ones for the load range you want are in the same price range.
Rigol RSA5000 series real-time spectrum analyzers - Page 1
Forum section: electronics / testgear

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: January 19, 2018, 04:19:07 pm
content: So, this popped up on reddit this afternoon:https://www.reddit.com/r/rfelectronics/comments/7raa3k/new_from_rigol_rsa5000_series_realtime_spectrum/Thoughts?Fromhttp://www.saelig.com/pr/rsa5000.html9kHz to 3.2 or 6.5GHz with a maximum sample rate of 51.2MS/s1ms full span sweepVertical range to +30dBm-108dBc/Hz (which is a useless number without the offset but it's "better" than their other SAs)1 Hz RBWReduced noise floor (DANL) to -165dBmCan also be used in a traditional swept scan modeUp to 40MHz Real-Time Bandwidth>146,000 FFTs/secDelivering down to 7.45us for a 100% Probability of InterceptSeven display modes (Normal, Density, Spectogram, Power v. Time, Density & Spectogram, PVT & Spectrum, PVT & Spectrogram)Include a Frequency Mask Trigger. The Frequency Mask Trigger is especially useful for triggering measurements of sporadic or transient events. (or so they say)Tracking generator option: 100kHz – 3.2/6.5GHz with an output range of -40dBm to 0dBm

author: Mr. Scram
author_rank: Super Contributor
timestamp: January 19, 2018, 04:24:00 pm
content: There's a thread on this series elsewhere.https://www.eevblog.com/forum/testgear/rigol-launches-rsa5000-series-the-first-real-time-spectrum-analyzer-in-china/

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: January 19, 2018, 04:25:27 pm
content: My bad, I thought I had gone back far enough. Mods, please delete!
Solder and soldering tips advice - Page 1
Forum section: electronics / testgear

author: SuperGiachi
author_rank: Contributor
timestamp: January 25, 2018, 10:34:16 pm
content: Hi, i finally ordered my soldering station and now need an advice on the best solders available here(Italy).What brands would you reccomend(both leaded and lead free)?Is lead-free much harder to work with than leaded?What kind of flux core do you reccomend?What size and shape tips do you reccomend for very small SMD work(ICs)?Thanks in advance!

author: tooki
author_rank: Super Contributor
timestamp: January 26, 2018, 11:21:20 pm
content: For the solder: Please, do a search on here for this. (Maybe keyword “kester” because that shows up in the answers.) This question gets asked every few weeks and the answers are always the same.

author: cowasaki
author_rank: Frequent Contributor
timestamp: January 27, 2018, 10:13:10 pm
content: There is an interesting discussion ongoing in another thread here >>https://www.eevblog.com/forum/reviews/solder-quality/
TC1 Transistor Checker not recognizing SCR - Please help - Page 1
Forum section: electronics / testgear

author: joystik
author_rank: Contributor
timestamp: January 18, 2018, 05:01:14 pm
content: Hi.I bought a TC1 transistor checker from banggood. It seems fine as I can measure bjts, mosfets, capacitors fine. However, i came across a thyristor or SCR , TYN612M, when I measure it the checker shows a BJT transistor with hfe, Ic, and Vbe of 0.The SCR is new and working fine. Also tested with DMM to make sure.Does anyone have any idea why is this?I dont understand the method the tester uses to identify the parts so, im not sure if I can troubleshoot it.

author: Gyro
author_rank: Super Contributor
timestamp: January 18, 2018, 09:52:00 pm
content: Most likely, it doesn't have high enough gate sensitivity for the tester to be able to identify it correctly:https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/Use the search option inside the thread for SCR.

author: joystik
author_rank: Contributor
timestamp: January 19, 2018, 11:53:52 am
content: Thank you, Gyro.

author: joystik
author_rank: Contributor
timestamp: January 19, 2018, 12:39:08 pm
content: From what I read on the thread, the tester will detect SCRs with gate current sensitivity less than 5 or 6 mA. The datasheet of the one I am testing says 1.5/5 mA.Im a bit confused.
Conitec Galep-4 EPROM programmer reduction in support  - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: January 18, 2018, 05:49:35 pm
content: I recently had a problem that the Galep-4 would not read the first byte of an FM18W08 correctly (the FM18W08 is Cypress' follow on to the Ramtron FM1808) it always returned x'66' when the device was configured as an FM1808.I believe that problem may occurr because the "Time to power up" of the FM18W08 is 10mS, while the FM1808 is ready to "Rock and Roll" after 1uS.I contacted Conitec about this as I knew they had a history of providing support for new devices without charge. The support person said he'd need to speak to management about new device support for the Galep-4.I'm sorry to report that a few days later Conitec came back and told me that they would no longer do new device support work for the Galep-4 free of charge. The impression I got was that it would be charged on a time and materials (plus profit) basis.Luckily my Dataman programmer worked a treat!CheersDave

author: philpem
author_rank: Frequent Contributor
timestamp: January 19, 2018, 08:02:01 am
content: To be fair to them, the Galep4 is a parallel port programmer they've been making for... maybe ten years or more?They still do "device on demand" for the Galep5:http://www.conitec.com/english/dod.phpI've sent them requests for bugfixes and device additions but I'd have to go back through my emails to find out what the outcome was. I think I'm running a Galep5 though (it has a USB port, so it can't be a 4)If new device support is a factor, Elnec were pretty good at that while I was still using my PRePROM-02aLV. They were pretty responsive to bug reports too -- I found an EPROM which had the wrong ChipID in the database (an 8 transposed for a B in the hex code) and I had a workaround next-day, and a full fix with the next software release. I might be wrong but I recall something changing with regard to licensing which pushed me toward the Galep and not a Beeprog.

author: perdrix
author_rank: Frequent Contributor
timestamp: January 19, 2018, 10:06:17 am
content: Hi Phil,I'm not castigating Conitec about htis - just letting folks know - it was pretty much inevitable that they'd reduce the support level at some stage ...Dave

author: tridentsx
author_rank: Regular Contributor
timestamp: January 19, 2018, 12:27:17 pm
content: I was going to get a conitec-5 programmer, before I bought I asked about support for 68HC711e9 and they said no we will not support this device or implement it in future. So I didnt by the conitec programmer.
HP signal generator with linear dial (from the '70s)...anyone remember? - Page 1
Forum section: electronics / testgear

author: Wimberleytech
author_rank: Super Contributor
timestamp: January 19, 2018, 12:14:46 am
content: Back in the '80s, I recall opening an HP signal generator that had a linear frequency dial.Inside were two logarithmic spiral pulleys linked with a string and spring to keep them taut.Because the spiral were logarithmic and oriented appropriately, they were able to achieve linear tic marks on the dial.That is what I remember. Was I dreaming? Should I start looking for a senior care facility?If anyone can help me validate my memory, I would appreciate it.

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: January 19, 2018, 12:59:44 am
content: Quote from: Wimberleytech on January 19, 2018, 12:14:46 amYou wouldn't be the first and only one. I once dreamt a complete meeting on a complex technical topic, in detail, with the agenda, the course of the discussion and the layout of the notes that I had been taking.Which I could not find, mysteriously. It took my boss some time to convince me by pointing out that the meeting on the previous day, of which I thought that it preceeded the meeting in question, was the last one happening. I was really, really confused. It was simply too vivid and detailed.That project did eat my mind and soul, taking large bites.

author: KE5FX
author_rank: Super Contributor
timestamp: January 19, 2018, 01:11:22 am
content: 8640A?

author: Wimberleytech
author_rank: Super Contributor
timestamp: January 19, 2018, 02:03:47 am
content: Quote from: KE5FX on January 19, 2018, 01:11:22 amNo. There was no digital display.

author: KE5FX
author_rank: Super Contributor
timestamp: January 19, 2018, 02:14:47 am
content: Quote from: Wimberleytech on January 19, 2018, 02:03:47 amRight -- the 8640A is the 8640B with a slide-rule dial.It fell short of the 8640B in the sex-appeal department, so they don't seem to have sold many. I think I've seen one, maybe two of them in my life...

author: TimNJ
author_rank: Super Contributor
timestamp: January 19, 2018, 02:37:27 am
content: 3310A, 3312A? But pulleys..im not too sure about that.

author: CatalinaWOW
author_rank: Super Contributor
timestamp: January 19, 2018, 02:40:36 am
content: 8614A has the logarithmic cams you describe, and a "digital" display in the form of a mechanical counter which is tied to the gear train driving the cams.

author: Wimberleytech
author_rank: Super Contributor
timestamp: January 19, 2018, 03:47:15 am
content: Quote from: CatalinaWOW on January 19, 2018, 02:40:36 amBAM!
Rechargeable Powerex battery warning for Agilent 1252B meters (and others?) - Page 1
Forum section: electronics / testgear

author: aargee
author_rank: Frequent Contributor
timestamp: January 18, 2018, 05:07:26 am
content: Hi all,Batteries - the curse of portable equipment.When I received my Agilent meter last year I replaced the supplied Powerex battery, since then the battery has been sitting on the shelf. I've just noticed the leak signs on one terminal as per the photo.If you are using this battery in your meter or anywhere else, you might want to check on it.

author: VK5RC
author_rank: Unknown
timestamp: January 18, 2018, 10:03:56 am
content: Thanks for letting everyone know.I have one in a u1253b and that battery is ok, I also use 4 of them as a floating +/- 18V low noise DC source for Instrument and other amps eg oscilloscope probe amps, all of these are about 5-6yr old and all ok.
Understanding the 34470A LTZ1000A Reference - Page 1
Forum section: electronics / testgear

author: new299
author_rank: Regular Contributor
timestamp: January 17, 2018, 10:41:44 am
content: Hi,I've been trying to better understand the LTZ1000 reference in the 34470A from the images of the board Dave posted. In particular, I'm wondering if it's possible to attach a 3458A A9 reference to this header via an adapter. As the same header is present on the 34465A (but partly unpopulated) I'm thinking this might be a nice upgrade for this instrument.However, while the design of the 34470A reference board follows the datasheet quite closely, the header appears to be quite different from the 3458A A9 reference.In particular, the following two connections are present on the 34470A header, but not the on 3458A:A connection to the 2n3904 emitter.A connection to pin 4 of the LTZ1000.Does anyone have any intuition as to what these might be used for? I'm guess they might be part of the ACAL system?I've attached my notes on the header. Some of the pins are occluded so it's possible I'm missing a AGND connection. Looking over the PCB, I also think I've traced pin 1 incorrectly (which doesn't make sense as shown in my notes) but the trace is hidden under a label so I can't see where it goes exactly.

author: TiN
author_rank: Super Contributor
timestamp: January 17, 2018, 10:59:28 am
content: These could be used for monitoring LTZ zener current and LTZ oven heater operation. Perhaps for some 2nd order compensation, or just simply for self-test procedures in 34470A.You don't need these connections if you just want to replace reference in 34465A. But I'd suggest to feed heater and signal section separately (meaning heater 3904 collector and heater diode connect by own +/- wires to +12...+15VDC at the clean linear supply in 34465A, and signal power and ground connect by own set of wires. Then output sense from pin 3 (+) and pin 7 (-) 7V reference connect to former LM399 zener voltage.Make sure to disconnect LM399 current drivecircuit from these pins, so you don't inject current into the LTZ.Perhaps you will have clear understanding if you instead reverse engineer all connections to those pins on your 34465A board. Just use fast DMM with buzzer to trace all connections out.I never saw/touch 3446x/7x myself, so can't help you on this. I didsimilar modify on HP 3245A few years ago, replacing LM399 with my own LTZ KX module, and it's happily working ever since.

author: new299
author_rank: Regular Contributor
timestamp: January 17, 2018, 11:12:39 am
content: Thanks TiN, I've spent a lot of time reviewing your site. I've built a KX reference too (though I'm waiting on the Z-foil resistors to complete it, comes up with normal Vishay foils too).I will start my investigation by probing out a 34465A when I have access to one (I should have one I don't care about the cal on, for this project). I guess there must be switching to switch in/out the LTZ1000 board sense pins too. It would be nice to better understand what's going on there and I will try and investigate.
I’m Impressed doing Business with TEquipment.NET. - Page 1
Forum section: electronics / testgear

author: nealfox
author_rank: Contributor
timestamp: January 17, 2018, 08:29:30 pm
content: I ordered a Rigol DS1054Z from TEquipment.NET last Sunday, the 14th. As the following Monday was Martin Luther King Day I doubt if the scope could have shipped prior to Tuesday. It arrived here in Vero Beach FL just after lunch today, Wednesday the 17th. Since I specified free shipment without expediting I was expecting it to take at least a week.
Very cheap GPIB-USB-HS on ebay - Page 1
Forum section: electronics / testgear

author: Kean
author_rank: Unknown
timestamp: January 17, 2018, 04:59:27 pm
content: Just saw this item come up in a search earlier today, and at that price (GBP 11 / AUD 19) I had to grab two.https://www.ebay.com.au/itm/National-Instrumens-NI-GPIB-USB-HS-Interface-Adapter-IEEE-488-New-Box-/122916870100The price seemed pretty suspicious considering what they usually sell for, the fact the seller was listed as being in a suburb of Sydney, but the price was in GBP, and importantly a seller with a feedback of 100% but with only a single rating.Funny thing is that all 10 sold within the day, all but the first within a 3 hour window local evening time.Anyway, I'm not trying to gloat, especially considering I have no idea what I'm going to receive. I'm just interested if anyone else here got in on the action as well?

author: Kean
author_rank: Unknown
timestamp: January 17, 2018, 06:52:24 pm
content: Well, a slightly unexpected result - I just got this email from eBay...Quote

author: TheSteve
author_rank: Unknown
timestamp: January 17, 2018, 07:16:24 pm
content: At that price it was a very expected result. Even the NI clones don't sell anywhere close to that price.
AccuMac Hand held Precision PRT reader - Page 1
Forum section: electronics / testgear

author: Luap2
author_rank: Contributor
timestamp: January 16, 2018, 07:35:01 pm
content: Looking for people who have used the Accmac AM 8010 Temp. readout for PRT probes or that brand of Temp measuring equipment. At the Lab I work at, we are looking at getting 6 or so reader and Industrial and Secondary Reference probes. So far its the AccuMac brand or Fluke 1523 hand held readers and Burns mfg. probes that meet our needs. I had never herd of AccuMac But I know Fluke is the big name in temp. measuring equipment. So if you have exp. with this please give me your thoughtsThanks Paul
Tektronix TDS7104 Anyone upgraded CPU board  - Page 1
Forum section: electronics / testgear

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 15, 2018, 07:30:04 pm
content: I have been reading different posts on this subject and after upgrading RAM on my BLX440 based TDS7104.And realizing only 256MB RAM can be seen...Does upgrading to the Radisys NLX board make any sense?I have been reading through Tin's page on TDS7404 but wow you need to spend a few hours and take notes! So much information.

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2018, 11:45:51 am
content: You can upgrade the memory to 512MB. You must use 256MB double sided DIMMs, though.

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 16, 2018, 01:07:20 pm
content: Do you happen to have a part number on double sided SIMM?I purchased 3- 256MB PC100 sticks. But they still show only 256MB total when installed.Reading the manual on BL440X Board it states 256MB maximum.During research I see you have quite a bit of experience with the TDS 7000 series.Thank you for your input.

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2018, 02:10:13 pm
content: Quote from: Johnny10 on January 16, 2018, 01:07:20 pmLike this one:https://www.ebay.com/itm/222797056326?Note that there's 16 chips, 8 on each side.What manual are you looking at - have a link?

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 16, 2018, 02:19:49 pm
content: Intel BL440zx.zip

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2018, 02:29:21 pm
content: Quote from: Johnny10 on January 16, 2018, 02:19:49 pmThe NLX board in your scope is based on the 440BX chipset, not the ZX! Let me see If I have the right manual in a bit...

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2018, 03:08:32 pm
content: I stand corrected. Funny how something you've assumed for so long turns out to be wrong.Sorry 'bout that!Currently working on this TDS7104, it has the ZX chipset and supports 512MB of ram.

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 16, 2018, 04:49:16 pm
content: Looks similar to mine.

author: Jwalling
author_rank: Unknown
timestamp: January 16, 2018, 04:54:36 pm
content: Quote from: Johnny10 on January 16, 2018, 04:49:16 pmOK, are your 256MB DIMMs double-sided like mine?

author: Johnny10
author_rank: Frequent Contributor
timestamp: January 16, 2018, 05:03:25 pm
content: Yes they are double sided.I did have another set...Pictured on top 2 sticks together make 512MBBottom stick M14N3264 just makes 256MB Single or Two togetherSo now I have 512MB in one of my scopes.
Uni-T UT33A autorange multimeter with backlight teardown - Page 1
Forum section: electronics / testgear

author: malgitobi
author_rank: Newbie
timestamp: January 15, 2018, 05:21:55 pm
content: Hello, this is my first multimeter I ever bought and I decided to open it because the rotary switch is not acting very well. I read here (https://www.eevblog.com/forum/testgear/uni-t-ut33d-very-low-cost-multimeter-teardown-and-review/) that the steel ball bearings may be the problem and actually that's was the case (one ball bearing wasn't in place). Also in that topic there is teardown of UT33A byvk6hdxbut my UT33A is someway different.1. Backlight button instead of transistor slot;2. Two ceramic fuses rated 0.4A/250V(5x20mm) and 10A/600V(6x25mm) instead one glass fuse;3. Metal pins for batteries instead of cables connected to the batteries holder;4. Display can't be disassembled because backlight is soldered to the PCB (maybe it's possible but I'm afraid to do it, and definitely don't want to desolder it).Backlight is very bright (blue color) and it doesn't turn off until the backlight button is pushed again. If you don't switch the rotary or push SELECT button for 14 minutes you'll hear 3 beeps which means after one more minute the meter will auto power-off.CLICK HERE TO SEE THE PICTURES
Leader 181A AC Millivoltmeter question - Page 1
Forum section: electronics / testgear

author: jsantoro
author_rank: Regular Contributor
timestamp: January 13, 2018, 08:47:52 pm
content: Hi,Just picked up this unit. I wanted an analog meter because I'm tired of staring at a DVM while trying to bias reel to reel tape decks. Anyway calibration on this seems very good (compared to a Fluke DMM). The input is a UHF type connector and a gnd terminal. If I attached a banana plug to the unit without either grounding it or attaching to a circuit the meter pegs hard. Do I need to use a shielded probe? The manual states you can use banana pus though.Thanks, Jim

author: ferdieCX
author_rank: Regular Contributor
timestamp: January 13, 2018, 09:12:06 pm
content: Hi, which range have you selected ? This is a very sensible instrument with 1mV range and 10 M input resistance. Even with a shielded probe, I would not select one of the lower ranges without first attaching the ground and signal clips to the circuit you are measuring.

author: jsantoro
author_rank: Regular Contributor
timestamp: January 13, 2018, 09:46:24 pm
content: It does it util the 3V range where it reads 1V with nothing connected to the probe. It's fine with no probe connected.

author: ferdieCX
author_rank: Regular Contributor
timestamp: January 14, 2018, 10:14:04 am
content: I would say, that your meter is working properly. If you connect a wire to the magnetic pick-up input of your stereo and turn the volume control up, you will hear a strong hum (and maybe damage the loudspeaker). It is the same effect, the unshielded wire is picking the surrounding electrosmog and passing it to the amplifier inside your meter.If the circuit under test has relative low impedance, a couple of banana wires may work. If the impedance is high, you will introduce hum in the circuit and false the measure.I have a TRIO vt-106, the input resistance is only 1 M instead of 10 M. It shows 130 mV with an 80 cm wire connected to the input. A shielded probe shows just 6 mV.The usual procedure to avoid violent movements of the needle is: 1) select a quite high range 2) connect the probe to the circuit under test 3) select the proper range and take the measure 4) select again a high range 5) disconnect the probe from the circuit

author: jsantoro
author_rank: Regular Contributor
timestamp: January 14, 2018, 04:21:54 pm
content: Thanks a bunch Ferdie!
UT58E calibration - Page 1
Forum section: electronics / testgear

author: cosmin1
author_rank: Regular Contributor
timestamp: January 16, 2018, 06:50:25 am
content: Hello.I manage to calibrate it somehow, but it's an expensive and stupid multimeter. Much worse than UT50E. The last 2 digits are not very stable.VR1 - CapacitanceVR2 - AC voltageVR3 - FrequencyVR4 - ?VR5 - TemperatureVR6 - ?
Powering DMM off LM317 instead of 9V battery , but what voltage ? - Page 1
Forum section: electronics / testgear

author: lordvader88
author_rank: Frequent Contributor
timestamp: January 14, 2018, 07:30:24 am
content: I don't have a 9V adapter so I'm going to use a 12V SMPS wall-wort with an LM317 circuit (only for the DMM, not other circuits too) . Just wondering tho the likely lower voltage I can get away with feeding it. Its a Brymen869. The battery light kicks in at 6.5V when its just reading AC wall hum in my room. I've never measured the output of the DMM when its pushing out current. But I'm sure it doesn't need 9V all the time since batteries aren't usually there, and its less likely to fail over time.

author: IanB
author_rank: Super Contributor
timestamp: January 14, 2018, 07:42:39 am
content: Can you try that again, but in English?

author: Daruosha
author_rank: Regular Contributor
timestamp: January 14, 2018, 08:39:00 am
content: If I understood correctly, you want to power your DMM with an external power supply instead of the internal batteries. And if this assumption is correct, it's a VERY bad idea to do it with a non-isolated power supply. In fact running a handheld DMM from any power source other than batteries would reduce the safety by a huge margin and in order to do it properly you have to consider lots of safety issues (true isolation from mains power, avoid sharing grounds in your DMM and the circuit which you measure and .... ).Long story short: don't do it if you don't know how to do it.

author: lordvader88
author_rank: Frequent Contributor
timestamp: January 14, 2018, 09:00:28 am
content: Yeah I'm more asleep than I realize, and yeah I just looked it up and its a bad idea, no wonder I have seen a video of someone recommending it .I did hook it up and run it up only tested a resistor and a capacitor. Oh well, I need a rechargeable 9V, and built a charger circuit, no problem.
Request for independent Harmonic distortion readings for Feeltech FY3200S - Page 1
Forum section: electronics / testgear

author: jcrubin
author_rank: Frequent Contributor
timestamp: December 31, 2017, 03:58:33 am
content: Hello,For those with the means to do so. Could you supply this thread with the unladen values for THD for a Feeltech FY3200S for1khz @ 1V10khz @ 1V20khz @ 1VWhile I do not have a bazzilion dollar machine to send mine of to,to accomplish this as a gold standard, I do have the consensus of this forum as a good enough to go by. Thanks in advance.

author: rhb
author_rank: Super Contributor
timestamp: January 11, 2018, 11:05:06 pm
content: At those frequencies, just feed the output to a sound card and record a WAV file. The read the WAV file in Octave, compute the amplitude spectrum and then calculate the sum of the amplitudes of the harmonics divided by the fundamental (i.e. 2nd + 3rd + 4th + 5th +...)/1st)You'll need an attenuator to keep from blowing out your sound card!!!! So read the manual to find out what the maximum allowable input level is. At AF a few 1/4 w resisters will do. Just make sure you take into account the impedances at each end.

author: jcrubin
author_rank: Frequent Contributor
timestamp: January 12, 2018, 03:52:14 am
content: Good call, that might be the way to go.RegardsJ

author: edavid
author_rank: Super Contributor
timestamp: January 12, 2018, 04:24:13 am
content: Here is what I measured with a Tek AA5001:1kHz 0.17%10kHz 0.16%20kHz 0.15%Why do you ask, though? This is obviously not an audio generator.

author: jcrubin
author_rank: Frequent Contributor
timestamp: January 12, 2018, 12:57:24 pm
content: Thanks! That is exactly what I was hoping to see as shown below, disregard the heathkit currently being restored in the graph belowYeah I get asked this question. Im using this first off to see that the 331A is on par with other digital THD meters against a known appliance. also im using this and other appliances to compare two thd meters.With this you have helped solve for my first issue
Philips PM 6303 RCL meter warm-up query - Page 1
Forum section: electronics / testgear

author: 1980s_john
author_rank: Contributor
timestamp: January 11, 2018, 10:06:57 pm
content: Hi,I've had this vintage LCR meter for about 9 months, and it has been working fine. Yesterday I switched it on from cold (set up a work bench in my out-house, about 4C) and it displayed E3, alternating with a number. After a few minutes it displayed a large H value, then after a further 5 minutes it settled down and displayed a low C value (less than 1pF) which it what it normally displays.Today I took it to work, and it did a similar thing after bringing it in from a cold car.Is this usual behaviour for a cold PM 6303? I expect there is no fix, other than to keep it switched on (or in a warm cupboard!), but am welcome to try renewing some old components if this would help (I think it is 100% original parts).Regards,John

author: SeanB
author_rank: Super Contributor
timestamp: January 12, 2018, 10:18:42 am
content: My bet is the blue electrolytic capacitors in the power supply are starting to get old. Very common with Phillips made electrolytics as they age is to have high ESR when cold, lowering as they warm up.

author: bd139
author_rank: Super Contributor
timestamp: January 12, 2018, 10:26:58 am
content: Agree. Those Philips electrolytics are always problematic. I've replaced piles of them in the last few years. Amazing what you can fix with just doing that. CPC (in UK) sell direct replacements for those capacitors (Vishay axial). They're quite expensive but the newer ones are much better quality.Also check there are no gold RIFA X2 capacitors around the inlet; those buggers always seem to explode in Philips kit and leave a right mess.

author: cvanc
author_rank: Frequent Contributor
timestamp: January 12, 2018, 10:54:37 am
content: I know nothing about the 6303 but will echo the comments made here - those old blue Philips electrolytics that say 'Made in Holland' on them are trouble. Change them out - always.

author: 1980s_john
author_rank: Contributor
timestamp: January 12, 2018, 11:08:02 am
content: Thanks I'll take a look at the PSU electrolytics. Fairly sure there are no Rifa X2 capacitors present, I had one of these go in a Philips oscilloscope and it was an easy fix (plus several other makes of switching PSUs eg Astec and Farnell).Regards,John
Rigol ADP0150BNC 50 Ohm Terminator - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: April 20, 2017, 04:53:29 am
content: Anyone know what the watt handling spec is on this? I have some Tektronix 50 Ohm feed through terminators that say 2W, but I saw a post somewhere that said the ADP0150BNC might only be good to about 250 mW. I thought I saw another spec published somewhere else that indicated the ADP0150BNC will really handle 2W but I haven't been able to relocate it. Anyone know for sure what the spec is on the ADP0150BNC? Thanks

author: trapc45
author_rank: Newbie
timestamp: January 11, 2018, 09:12:26 pm
content: https://www.rigol-uk.co.uk/Rigol-ADP0150BNC-Impedance-Adapter-p/adp0150bnc.htmNot sure if this helps, but the link on the UK site list it as 1 W. The piture however appears to show a 2 W rating. The one I received is just labeled as 50 ohm DC to 1 GHz with no power rating.
GOULD 4072A - Page 1
Forum section: electronics / testgear

author: comet2458
author_rank: Newbie
timestamp: January 11, 2018, 11:57:48 am
content: hi to all,i am looking for a service manual for the GOULD 4072A...( A ) versionthis is the 2ch 200mhz versionthanking all in advancemick