hybridfree/eevblog-posts huggingface dataset:
eevblog-121gw-multimeter - Page 1
Forum section: electronics / testgear

author: ehughes
author_rank: Frequent Contributor
timestamp: December 22, 2017, 05:37:35 pm
content: I see that the kickstarter is funded. When will it be generally available? We wanted to get another meter for the lab and wanted to give this one a go.

author: Bootalito
author_rank: Unknown
timestamp: December 25, 2017, 06:18:13 am
content: I second this. I just went to the kick starter to give money and there is nowhere to give money!When will it be generally available?

author: SaKhan
author_rank: Contributor
timestamp: December 26, 2017, 06:11:10 pm
content: Quote from: ehughes on December 22, 2017, 05:37:35 pmAccording to the last kickstarter update:QuoteThat means that the earliest realistic GA date could be around mid of March - April but Dave might have other plans for it.

author: shteii01
author_rank: Frequent Contributor
timestamp: December 27, 2017, 01:43:43 am
content: From AmpHour podcast, Dave got the Christmas batch done. However, manufacturer then reported that they will not have some parts until March or so. So figure next batch will be mid spring 2018 if people keep asking for it.

author: EEVblog
author_rank: Unknown
timestamp: December 27, 2017, 01:47:13 am
content: Quote from: Bootalito on December 25, 2017, 06:18:13 amI am not taking additional order.It will be available when it's available. Sometime in March at the earliest.
Tds744a Application Menu - Page 1
Forum section: electronics / testgear

author: mlefe
author_rank: Regular Contributor
timestamp: December 26, 2017, 02:44:10 am
content: Hi guys,I've just fixed a TDS744a and I'm getting to know itI'm curious about the application button that you can reach by using the SHIFT button (on the measure button).I search for the functionality in the manual but I couldn't find it.When I push it, no options are shown: is that correct? What am I missing?Thanks!

author: chronos42
author_rank: Regular Contributor
timestamp: December 27, 2017, 11:03:49 am
content: A look in the scope manual will answer your question.Or use the HELP function of your scope.Application is only usable with an external controller.

author: mlefe
author_rank: Regular Contributor
timestamp: December 27, 2017, 02:59:40 pm
content: Quote from: chronos42 on December 27, 2017, 11:03:49 amI did look at it but obviously was not a good one... sorry about that.You're absolutely right as well about the help button, I guess not used to that either.In any case, thank you for the answer
R&S UPA 3 accuracy - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: December 25, 2017, 02:46:31 pm
content: Good afternoon (o;Is someone in the possession of a R&S UPA 3 and can say something about its accuracy?Like to what lowest level it can measure THD?Or are there any better used instruments out there to measure frequency response and THD/SNR of audio equipment?thanks in advancedavorin

author: HalFET
author_rank: Frequent Contributor
timestamp: December 26, 2017, 07:31:05 am
content: If it follows the general R&S trend it'll outperform the specifications in the manual and weigh in somewhere between bridge counter weight and small moon.
micsig TO1000 ethernet problem - Page 1
Forum section: electronics / testgear

author: kirill_ka
author_rank: Frequent Contributor
timestamp: December 29, 2017, 11:26:33 am
content: When trying to transfer video files from my TO1074 I did notice that the speed is too low. Later I did a bit of research and came to conclusion that it's likely a hardware bug. In short, they used SoC and ethernet PHY which are incompatible. SoC (S5P4418 according to review by mikeselectricstuff) only supports RGMII interface (see attached piece of specification). Ethernet phy is RTL8101F and it supports MII and RMII. RMII and RGMII are different in may ways. MII and RGMII are similar, but they use different direction of TX Clock signal. In RGMII clock is supplied by MAC versus MII, where clock is supplied by PHY.My experiments confirm that the clocks are not synchronised: I see packet loss and ethernet crc errors on the PC side.Ti DP83822i is an example of 10/100 Mbit transceiver which IS compatible with RGMII. It's datasheet also has quick description of RMII, MII and RGMII interfaces.http://wiki.friendlyarm.com/wiki/images/a/a7/Pi2_SOC_DS_0.1.pdfhttp://datasheets.gpio.dk/dl/rtl8201%28f_fl_fn%29-vb-cg_datasheet_1.4.pdfhttp://www.ti.com/lit/ds/symlink/dp83822i.pdf
How to rack mount HP Test equipment, ie. HP8644A/B - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: December 24, 2017, 06:50:51 pm
content: This sounds silly but I can't figure this out. I looked for pictures also but I can't seem to find what I need.I have several HP-8644 signal generators (A and B variety) that I want to rack mount. Some of them came with rack ears, so that far is simple enough. But how does the side and back get supported? There does not seem to have a provision for sliding rails or rear supports. Because of the weight, I can't imagine these can be supported by just the front being bolted to the frame. How is this done??Thank you.

author: Tony_G
author_rank: Super Contributor
timestamp: December 24, 2017, 07:59:59 pm
content: They generally sit on rails (as compared to middle rails that you see in some PC environments - Here is one from my rack (unfortunately this one is upside down but it is the only picture I had):You can get proper rails for a test equipment cabinet or you can just use angle iron/aluminium (i ended up using a mix due to the cabinets coming with rails but not enough).TonyG

author: tkamiya
author_rank: Super Contributor
timestamp: December 25, 2017, 01:17:59 am
content: That makes sense. Thank you very much. Photograph was very helpful.

author: KE5FX
author_rank: Super Contributor
timestamp: December 25, 2017, 03:18:20 am
content: Quote from: Tony_G on December 24, 2017, 07:59:59 pmThat's right-side up.The real HP rack rails have tabs that fit into slots that stabilize the rails in a belt-and-suspenders fashion:Can't say that I've ever seen a Teflon screw used to mount a rack rail before, but I'd sure want those tabs in place if I did...

author: Tony_G
author_rank: Super Contributor
timestamp: December 25, 2017, 04:34:24 am
content: Quote from: KE5FX on December 25, 2017, 03:18:20 amYep, I have some rails that have those tabs that hook into the slots on the sides and they do sit that way. However, that rail in the photo is upside down. They were like that in the rack when I got it and yet the gear didn't line up with the HP rack holes on the ears until I flipped them.I suspect these are either '3rd party' rails or HP changed the layout in the later ones.I prefer these ones with the tabs to be honest.TonyGBTW thanks for your GPIB toolkit really appreciate your work there.

author: KE5FX
author_rank: Super Contributor
timestamp: December 25, 2017, 08:05:24 am
content: Quote from: Tony_G on December 25, 2017, 04:34:24 amYou're very welcome!

author: deepskyridge
author_rank: Regular Contributor
timestamp: December 25, 2017, 02:10:27 pm
content: I used a couple of rails from Navepoint in my small rack here in the LAB.They work just fine.Gary
SOLVED: Help diagnosing a blank screen on mV range on BM257 - Page 1
Forum section: electronics / testgear

author: Bootalito
author_rank: Unknown
timestamp: December 25, 2017, 02:51:55 pm
content: UPDATE:Ok, this is weird. I was watching this video(calibration of another Brymen meter), linked from this posthttps://www.eevblog.com/forum/testgear/brymen-257s-lost-calibration-data/,and just for kicks I tried to initiate the calibration procedure for this other Brymen meter by pressing and holding the SELECT and HOLD button while turning it to Ohms range. It didn't actually go into calibration mode as this is a different meter. BUT. It suddenly works now! I can't explain it. I just held down SELECT and HOLD while moving the range switch to Ohms mode within 1 second and everything works now.ORIGINAL POST:The mV range on my BM257 just has a blank screen. Pressing any button doesn't do anything (typically SELECT switches to temperature; k-type thermocouple. It just stays the same). Long pressing the buttons makes a beep. The LCD screen seems to be flickering on this mode whereas its rock steady on all other modes. The battery voltage is fine. All other features (V, ohms, diode, current, etc) work fine and actually seem to be in spec.Anyone have any guesses or wild ideas?
Siglent power supply noise - Page 1
Forum section: electronics / testgear

author: pherdie
author_rank: Contributor
timestamp: December 23, 2017, 10:25:56 pm
content: At Christmas time I put up outdoor lighting that for convenience sake, is switched by the use of power line carrier (RF) modules.This year, after completing installation of my lights, I had one power control module that failed to respond to control signals. Some quick trouble shooting seemed to indicate the module was fine but unable to receive signals, possibly due to noise on the power circuit. I have approximately fifteen pieces of test equipment on the same circuit, so I started a process of unplugging test equipment to see if the problem resolved. I found that two Siglent devices I had acquired during the past year were both independently generating enough power line noise (when turned 'off') to render my control module inoperative, a Siglent SDG2042X function generator and a Siglent SSA3021X spectrum analyzer.I have made no further tests at this time to investigate the issue due to other personal obligations but thought that now sharing this information may be of use to others.

author: tautech
author_rank: Super Contributor
timestamp: December 23, 2017, 10:32:01 pm
content: The SDG2042X shouldn't be putting anything on the mains supply when Off as it's hard switched.The SSA3021X on the other hand is not, it's SMPS is in idle mode when powered and Off.Yes, please dig deeper into this when you have some time.

author: JDubU
author_rank: Frequent Contributor
timestamp: December 24, 2017, 01:55:07 pm
content: Have you checked your wall outlet wiring to verify that it is properly grounded and that the hot and neutral are not swapped?
Keithley 2015 firmware update / calibration - Page 1
Forum section: electronics / testgear

author: alocam
author_rank: Regular Contributor
timestamp: November 25, 2017, 10:54:29 pm
content: Hello, I have read some old posts regarding K-2015 firmware update, and possible loss of cal data when upgrading from certain old versions. I have just got a 2015, and its firmware is A07 / A02, which seems to be quite outdated.Apparently, there is a B17 FW, but I would first like to make sure I will not lose calibration in case of upgrading. Is there any list of fixes and improvements for this unit's firmware?Does anyone have software that allows to backup the calibration data and further rewriting data on newer firmware?Any comments will be appreciated!regards!

author: diodak
author_rank: Regular Contributor
timestamp: December 23, 2017, 08:52:49 pm
content: The calibration data can be read by the programmer - this is the memory with the I2C interface. There is no way to do it through software. Some calibration factors can be read through RS232 but not all ...

author: Kleinstein
author_rank: Super Contributor
timestamp: December 23, 2017, 09:31:55 pm
content: Even if you read out the cal memory, there is the danger of a change in the data format for the cal data. This is one reason why cal data might got lost on a FW update.
BK 393 peak± feature - Page 1
Forum section: electronics / testgear

author: ajasmin
author_rank: Newbie
timestamp: July 11, 2017, 01:43:24 am
content: I'm trying to use the peak detect function on a BK 393 multimeter but I can't make the PEAK± button to do anything.I see the P+ and P- segments during the LCD turn-on test. Though, they're never displayed during actual use. I tried pressing PEAK in different modes, with and without MIN/MAX, with and without manual rangingto no avail.I believe this is a broken unit, but asking here just in case I'm missing something obvious.Incidentally, I've had this BK 393 multimeter for some time but rarely ever use it. It has a couple of problems that throw me off:Plastic hanging hook that broke the first time I tried popping it ofWashed out LCD back lightBattery indicator level that change widely between meter functions

author: geekGee
author_rank: Unknown
timestamp: December 23, 2017, 09:09:51 pm
content: I have to agree on the back light... worst I have seen in person.The PEAK± button only appears to work in VAC(not mVAC) mode and you have to hold it in to enable and disable.
Agilent 6227B and others with analog readout -- tuning resolution? - Page 1
Forum section: electronics / testgear

author: braincat
author_rank: Contributor
timestamp: December 21, 2017, 02:42:19 am
content: Folks,I am thinking of getting an older power supply from Ebay, e.g. 6227B -- could you please comment on whether the knobs allow fine-tuning the output voltage, for example, to 3.3V (it would seem I would have to use an external multimeter in any case because of analog voltmeter).Thank you.

author: alm
author_rank: Super Contributor
timestamp: December 23, 2017, 11:15:49 am
content: I doubt there are any 6227B power supplies with Agilent branding, given that the Agilent name appeared around 2000, and these power supplies were probably made until the early nineties.If you look at theHP 6227B specifications, they specify the resolution of the fine control knob on the 6227B as 5 mV / 1 mA, so it should be able to get pretty close to 3.3 V. Of course the resolution of the panel meter will be less.

author: David Hess
author_rank: Super Contributor
timestamp: December 23, 2017, 07:19:24 pm
content: A good potentiometer has a settability of 0.1% (1) so over a 25 volt range, that is 25 millivolts. But with coarse and fine controls, that is not a problem. It looks like a really nice power supply.(1) - Page 30, Troubleshooting Analog Circuits page, Robert Pease
Advantest TR4511 RF signal source - Page 1
Forum section: electronics / testgear

author: COSMOS2K
author_rank: Contributor
timestamp: December 23, 2017, 10:25:41 am
content: Hello:I purchased an Advantest TR4511 signal source RF. I would like to have the user manual and the service manual, if someone has them and shares them I would be very grateful.Merry Christmas
Oscilloscopes with more than 4 channels - Page 1
Forum section: electronics / testgear

author: JPortici
author_rank: Super Contributor
timestamp: December 22, 2017, 02:56:37 pm
content: In a current project I am using all four channels, but life would be easier if i had more!Actually in this project i'm not looking at the real waveforms, but at a part of the circuit converts all the higher voltage peaks into microcontroller-readable 5 volt pulses, which is want i want to look at..At this point i may be good with a logic analyzer (which i have but not here with me) but i thought it would be interesting to know what equipment is available.And who wouldn't love to have a test drive with a new scopei only know of three currently in production:- Picoscope 4824 has 8 channels at 80 MS/s. should be more than good enough for most of the times i'd rather have more than 4 chan- Lecroy HDO8000A Series, but bloody expensive.- Tek MDO5, samewhat about the second hand market?

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: December 22, 2017, 03:02:50 pm
content: The cheapest answer is probably to just use two scopes. Not so convenient, but you're always going to have single trigger source, which can be fed to both.

author: nctnico
author_rank: Super Contributor
timestamp: December 22, 2017, 04:56:28 pm
content: Look for Yokogawa. They have several 8 channel models.

author: tautech
author_rank: Super Contributor
timestamp: December 22, 2017, 07:41:43 pm
content: Could a MSO with appropriately rated digital inputs meet your needs ?What do you call HV ?

author: JPortici
author_rank: Super Contributor
timestamp: December 22, 2017, 11:06:57 pm
content: not actually looking for a new scope, as i've already solved the problem at hand.I'm wondering about which scopes, old and new, come with more than 4 channelshow is yokogawa's software? never had the pleasure to play with one, besides lecroy rebadges

author: nctnico
author_rank: Super Contributor
timestamp: December 22, 2017, 11:18:39 pm
content: Quote from: JPortici on December 22, 2017, 11:06:57 pmThe firmware you mean? I used to own a DL1740. Their oscilloscopes work well and offer many features but the older models are -well- old so their screens have a low resolution and the processing power isn't that great for stuff like FFT.

author: David Hess
author_rank: Super Contributor
timestamp: December 23, 2017, 02:31:38 am
content: The Tektronix 555 and 556 dual beam oscilloscopes could use a pair of 50 MHz 1A4 quad trace vertical plug-ins for 8 channels. These oscilloscope could also display 4 channels plus the output of a spectrum analyser plug-in making them the first mixed domain oscilloscopes. The Tektronix 5000 series mainframes could use a pair of 1 MHz 5A14N quad trace vertical plug-ins for 8 channels. The Tektronix TLS216 "Logic Scope" is essentially a logic analyser with 16 x 8-bit 500 MHz 2 GS/s oscilloscope inputs.When I needed a 4 channel DSO a couple years ago, I bought a pair of inexpensive Tektronix 2230s and stacked one on top of the other.
HELP - How do I unlock my Micsig TO1104 tBook mini scope? - Page 1
Forum section: electronics / testgear

author: thogevoll
author_rank: Newbie
timestamp: December 26, 2017, 01:39:59 am
content: I don't know what I did but somehow I caused my new Micsig TO1104 scope to go into some kind of lock mode. There is now a padlock icon in the upper right corner of the screen. I can't even shut the scope down or restart it and cannot even launch the o-scope application. I can hit the power button which will bring up four choices: Standby, Restart, Shutdown and Unlock. However, Unlock does not unlock the scope. Indeed none of these options works.I'm at a total loss. How do I get it unlocked?Thanks.

author: thogevoll
author_rank: Newbie
timestamp: December 26, 2017, 01:50:43 am
content: I got it unlocked. I figured what the heck I got nothing to loose at this point and tried holding the power button down and the scope shutdown. Upon powering it up it came up unlocked. Whew, what a relief. I thought I bricked it.

author: jacklee
author_rank: Regular Contributor
timestamp: December 28, 2017, 09:52:46 am
content: Push power button there are four options, last one is lock(unlock).
Sorrow and grief for all devices that you almost had but lost to someboy else... - Page 1
Forum section: electronics / testgear

author: DC1MC
author_rank: Super Contributor
timestamp: December 20, 2017, 08:31:44 pm
content: Today I've lost a splendid USB logic analyzer Intronix LogicPort LA1034 on fleabay, I wanted to use it to decode the communication protocol of the FY6600 signal generator, between the front panel and the signal board.Until I find something similar for ca 150EUR the project will be delayed weeks, maybe months, because I will lose the end of year vacation and then the dayjob will start full speed, now I have to find something else to do in vacation.Learn from my sad story and put few more shekels in Gixen if you want to buy a something that you actually want to use soon, or it's very seldom.Share what have you lost recently.

author: Kilo Tango
author_rank: Regular Contributor
timestamp: December 20, 2017, 08:35:33 pm
content: https://www.ebay.co.uk/itm/INTRONIX-Logicport-34-Channel-Logic-Analyzer/192400370628Ken

author: DC1MC
author_rank: Super Contributor
timestamp: December 20, 2017, 08:59:04 pm
content: Hi Ken, yeah, is the only one left on the whole fleabay, but sadly it will not do, not even close.Why so ?- It cost more than a new one due to forced friggin VAT and customs.- It's in US, minimum 3 weeks in this season, most likely one month to arrive, and in February the year will be in full speed with lots of stress and shit.The lost one was like 50% of the price and in Germany, Friday latest Monday I could have had it here and start working, the FY6600 it's finally on its way.Quote from: Kilo Tango on December 20, 2017, 08:35:33 pm

author: Old Printer
author_rank: Frequent Contributor
timestamp: December 21, 2017, 01:06:04 am
content: The problem with beating yourself up over loosing an eBay bidding session, and I have lost my share, is that you never know how high the eventual buyer was willing to go. It seems like a few bucks at the time, but they might have been ready to bid a bundle. All you can do is set yourself a reasonable limit, stick to it, and put it out of your mind if you don't get it. But talk is cheap when it's someone else I am advising, I feel your pain and frustration my friend.

author: Mr. Scram
author_rank: Super Contributor
timestamp: December 21, 2017, 01:10:35 am
content: Quote from: Old Printer on December 21, 2017, 01:06:04 amMost things I can let go fairly easily, but if it's that one piece of equipment I turn out needing a lot later, it can really haunt my thoughts.

author: nctnico
author_rank: Super Contributor
timestamp: December 21, 2017, 11:39:28 pm
content: Quote from: Old Printer on December 21, 2017, 01:06:04 amVery true but every now and then I think I should have set a higher limit -in hindsight-. But that is still no guarantee you would have 'won' the item because some bidders really want an item and bid an insanely high amount. Yes, sometimes that bidder has been me

author: Old Printer
author_rank: Frequent Contributor
timestamp: December 22, 2017, 12:18:48 am
content: Quote from: nctnico on December 21, 2017, 11:39:28 pmSo you're the guy that keeps getting my stuff!!.
Fluke 8840A A/D Schematic Page - Page 1
Forum section: electronics / testgear

author: Kjo
author_rank: Regular Contributor
timestamp: December 19, 2017, 08:48:07 pm
content: I'm fixing one of several 8840As I have and I cant find the schematic to the A/D converter section any where. The only manual on the WEB is from the Fluke site and it is copied everywhere. But it is missing the schematic page containing the A/D converter (U101)! I dont see where anyone has flagged this in all of the discussions on the WEB either. Maybe someone has an original manual that could be scanned. The only manual I have ever seen in labeled "PN 879304 Dec 1991 Rev 3 5/97" on the front page.

author: pelule
author_rank: Frequent Contributor
timestamp: December 19, 2017, 10:22:25 pm
content: Hi,why not upload from the WEB?https://www.elso.sk/media/download/pdf/fluke/man/Fluke-8840A-umen.pdf/PeLuLe

author: Gertjan
author_rank: Frequent Contributor
timestamp: December 20, 2017, 12:28:41 pm
content: Hi Kjo,I have another version of the 8840A manual: Rev.2, 4/94.You can download it from my webserver:http://www.miedema.dyndns.org/eevblog/FLUKE_8840A_Digital_Multimeter_Instruction_Manual.pdfThe schematic you are looking for in inconveniently split in two halves. But I checked against my paper copy (Rev.1), and it is complete.(see page 183 + 184)regards, Gertjan.

author: pelule
author_rank: Frequent Contributor
timestamp: December 20, 2017, 12:40:08 pm
content: I need to apologize for a to fast look over. That PDF I referred to does not contain Sheet 2 (ADC) either.I have scanned the schematic and the part of the ADC placeplan, but size exceeds the limits of attachments at EEVBLOG (600 DPI scan).Thus I have uploaded it to my Dropbox:https://www.dropbox.com/sh/f9rwdmv1lzo2yyr/AAB6Lthhn2OzzIRNscTf_GZea?dl=0As a special "sorry" I added the schematic to the manual (PDF) and uploaded it also (the complete document).I will keep that link valid until Xmax (24/Dec) if someone else has an urgent need.I have uploaded it to KO4BB, but it normally it need some time, bevor it is visible for the public./PeLuLe

author: RobK_NL
author_rank: Frequent Contributor
timestamp: December 21, 2017, 10:17:46 am
content: The 8840 uses the exact same A/D converter as the 8842:http://assets.fluke.com/manuals/8842a___imeng0300.pdf

author: TheDefpom
author_rank: Frequent Contributor
timestamp: December 21, 2017, 10:42:24 pm
content: I did a very short (and not very good) video a couple of years ago showing the digital signals on the ADC on the 8842A, it may be of interest to you if troubleshooting the unit, as it gives you an idea what to expect or check for.This was using the Logic Analyser inputs of my scope, my notes from the time on the video:Scope patterns of digital on ADC and TP101, triggering from TP201, troubleshooting incorrect readings on display, vs input voltages or resistances.Scope shows the digital outputs for the resistor ladder, and TP101 output which is fed back into the A/D converter IC.
Siglent SDS 1104X-E 4 Channel Scope -My Review on YouTube - Page 1
Forum section: electronics / testgear

author: TheDefpom
author_rank: Frequent Contributor
timestamp: December 21, 2017, 07:12:38 pm
content: I take a look at the GUI and user experience of the new scope.Rob (tautech) lent me a unit to have a play with, so thanks Rob.#320 Siglent SDS 1104X-E 4 Channel Scope Reviewhttps://youtu.be/kuiDj1iwOwk
Tektronix 3032 - Page 1
Forum section: electronics / testgear

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: December 18, 2017, 08:30:40 am
content: Hello, I was thinking to gave me a present, and I saw a tektronix 3032 with no options, 2channel, 300Mhz 2.5G/s at 500 buck, my rigol is a good unit..but is only 100Mhz, and with a slow sample rate, and this oscilloscope seems pretty good for the budget, I need of a 200Mhz 2G/s oscilloscope, and this seems a good unit for the priceInviato dal mio SM-G920F utilizzando Tapatalk

author: texaspyro
author_rank: Super Contributor
timestamp: December 18, 2017, 11:54:33 pm
content: If it comes with a serial, gpib, or network interface it's trivial to upgrade it to a 3052 500 MHz / 5 Gs/s scope. There's a thread on the forum giving details.If you have one of the application modules, you can also enable all options by re-writing the serial EEPROM on the module. Another forum thread give the details.

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: December 19, 2017, 03:44:51 pm
content: Quote from: texaspyro on December 18, 2017, 11:54:33 pmOh, that sound very good! How about construction, shielding, reliability?And can you link me the treads please? I don't find anything

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: December 19, 2017, 03:48:16 pm
content: And yes, it comes with the gbip

author: texaspyro
author_rank: Super Contributor
timestamp: December 20, 2017, 01:28:00 am
content: The bandwidth hack is discussed here:https://www.eevblog.com/forum/testgear/tds-1000-2000-3000-bw-hack/For the options upgrade search for TDS3UAM and TDS3ENG. I think the TDS3ENG enables one more option than TDS3UAM. I think my scope came with the TDS3UAM hack.
Rigol RP1100D teardown - Page 1
Forum section: electronics / testgear

author: patriot
author_rank: Newbie
timestamp: December 18, 2017, 04:57:35 pm
content: Hi,I saw here a Pintek DP-100 100Mhz differential probe teardown.From outside my Rigol RP1100D looks absolutely identical so I was wondering if it is the same probe.I think my Rigol probe is really made by Pintek. But I have probably newer revision of internal electronic.On my PCB is written revision DP-100-E1 while Pintek reviewed here has written DP100-D. My Rigol probe has board based on SMD devices, older Pintek here through hole devices.My Rigol probe has well shielded case made by conductive paint while Pintek probe is missing this feature. On other hand Rigol probe is missing battery slot and rely only on external DC power adapter.Unfortunately Rigol probe has wiped off IC naming. What bullshit practice - especially from Chinese company. It is so ironic ...So just enjoy pics if you want ...By the way, my initial purpose to look inside this probe was make ZERO offset of this probe (is it 0.7V now on x100 range). But there is lot of trimmers, so not easy without function description. If somebody know how to proceed this please let me know.Updated: Rigol RP1100D could be in fact rebranded Pintech DP-100, as Tautech stated below.

author: JPortici
author_rank: Super Contributor
timestamp: December 18, 2017, 05:48:48 pm
content: all the trimmers are labelled.. it shouldn't be too hardi.e.: VR34 has x100 DC on it, i would bet it adjusts the DC offset at x100 gainVR35 instead has x1000 G, my gut tells me it's gain adjustment at x1000

author: tautech
author_rank: Super Contributor
timestamp: December 18, 2017, 06:29:57 pm
content: Let's be clear about differential probe branding from this part of the world.It could be Pintek (China) or Pintech (Taiwan).Pintech were first in the market and then closely copied by Pintek.It is not at all surprising today that Pintech would scrub IC's to protect their IP.From the enclosure form factor it sure looks like aPintech.

author: patriot
author_rank: Newbie
timestamp: December 19, 2017, 01:56:38 pm
content: Quote from: JPortici on December 18, 2017, 05:48:48 pmRight. But there is for example x100 DC and x200 DC but not x500 DC or x1000 DC. So it can be somehow shared. In other words maybe I will change bias on other range or maybe even other parameters can be affected and need to be readjusted at same time. I dont know which parameters should I take care. Maybe it is simple. Maybe not. Without schematic or calibration guide it is too risky for me.

author: patriot
author_rank: Newbie
timestamp: December 19, 2017, 02:26:44 pm
content: Quote from: tautech on December 18, 2017, 06:29:57 pmYou are probably right - on back is written "Made in Taiwan". And I found DP100 on Pintech web which looks identicalBy the way the situation with current probes is same?I think my Rigol RP1002C looks identical to Pintech PT710-C. With exactly same label "Made in Taiwan".Maybe I will add some internal photo later.
OEM for Keysight N8900 Series DC Power Supply? - Page 1
Forum section: electronics / testgear

author: magicsmoke
author_rank: Regular Contributor
timestamp: June 19, 2015, 07:13:05 am
content: Anyone know who the OEM for Keysight's N8900 autoranging system DC power supplies is? Or is it a Keysight design. I am pretty sure that the N5700 and N8700 series DC power supplies are designed and made by TDK Lambda but the N8900 series doesn't look like there Genesys line.

author: EEVblog
author_rank: Unknown
timestamp: June 19, 2015, 10:23:36 am
content: Looks like they might make it themselves.

author: Lukas
author_rank: Frequent Contributor
timestamp: June 19, 2015, 06:35:20 pm
content: I downloaded the firmware update and pulled it apart:Code:$binwalk N89XX-A_00_06.updDECIMAL HEXADECIMAL DESCRIPTION--------------------------------------------------------------------------------8 0x8 XML document, version: "1.0"1321 0x529 gzip compressed data, fastest compression, from FAT filesystem (MS-DOS, OS/2, NT), NULL date: Thu Jan 1 01:00:00 197017138939 0x10584FB Zlib compressed data, compressed, uncompressed size >= 95509The gzip one looks interesting, extract this one:Code:$dd if=N89XX-A_00_06.upd bs=1 skip=1321 of=asdf.gz$file asdfasdf: Windows Embedded CE binary imageUmm, Windows CE, very likely to be Agi^h^hKeysight, let's confirm that:Code:strings asdf | grep AgileAgilentLan488Server32.dllAgilentPalCaps.dllAgilentPalIO.dllAgilentPalSStorage.dllAgilentLxiUnmanaged.dllAgilentSStorageUnmanaged.dllAgilentSysMngmntUnmanaged.dll...So this one is absolutely original Keysight.

author: bitburger
author_rank: Newbie
timestamp: December 19, 2017, 09:31:59 pm
content: It's a hybrid, really. The power processing circuitry an OEM from Elektro-Automatik. Keysight then makes their own front panel, controller, and communications interface.
Mains measurement with DSO1062S - Page 1
Forum section: electronics / testgear

author: julienbxl
author_rank: Newbie
timestamp: December 19, 2017, 06:22:33 pm
content: Hello,I received a DSO1062S (isolated portable scope) to make mains (Europe, 230VAC) measurement.It will be more conveniant for me to use banana leads instead of standard probe to connect the scope to socket adapter or light fixture adapter.My question : can I use a regular BNC=>banana converter or shoud I buy aswell a 10:1 attenuator (like this onehttp://hantek.eu/attenuator-xfa-10-1-mc.html) ?Characteristics of the scope let me think it will be ok but I am not sure about it and don't want to fry my new toy :-)If I buy this attenuator I should set probe parameter in the scope to 10X, correct ?And if I don't, I should set 1X I guess but then the volt/div would be exceeded ?Thank you !
HP 54542A Applications Menu - Page 1
Forum section: electronics / testgear

author: ghpicard
author_rank: Contributor
timestamp: December 19, 2017, 04:46:46 am
content: Hi all,I have recently acquired an HP 54542A DSO and find intriguing that there is a menu called "Applications" which shows no operations or actions whatsoever when selected. It is the "blue" function over the Utility Menu button.I have gone over the manuals (service and user) as well as I can but they are just image PDFs (as in "non searcheable") so I can have missed the details.Does anyone know what kind of functions it should have invoked? Or is it just some "future proof" functionality that was simply left behind? This series does not have a connector in the back to add functionalities as the 546XX did so I imagine that upgrades had to be made either through FDD uploads or perhaps adding EPROMs in free sockets inside. No, I didn't find the heart to break it apart... yet.Thanks for your insights or theories.

author: Nx-1997
author_rank: Regular Contributor
timestamp: December 19, 2017, 09:16:12 am
content: More info here:https://www.keysight.com/main/techSupport.jspx?cc=CA&lc=eng&nid=-32417.536881117&pid=1000001425%3Aepsg%3Apro&pageMode=DSYou need a floppy disk, the scope searches for basic program files on the floppy disk. These programs are useless to average scope user, mainly telecom masks.
Oscilloscope afflictions - Page 1
Forum section: electronics / testgear

author: tggzzz
author_rank: Super Contributor
timestamp: December 19, 2017, 02:05:32 pm
content: Are you afflicted by any of these?Slipped Probe, Aliasitis, Scope Blindness, Tinnitus, Screen of Death, Sluggishbootus, Execfile Dysfunction, Cal Lab Abscondia, Scopehoardism, Touchscreen Disease, Cordtripyouup. Just from reading those names it is likely that RealScopes(TM)won't suffer from some of those.Source:https://www.edn.com/electronics-blogs/benchtalk/4429683/Oscilloscope-diseasesas pointed out by Michael Dunn athttps://groups.io/g/TekScopes/table?id=2209N.B. that is the replacement for the Yahoo! TekScopes group. It is just coming online.

author: JPortici
author_rank: Super Contributor
timestamp: December 19, 2017, 02:47:37 pm
content: Slipped Probe

author: rsjsouza
author_rank: Super Contributor
timestamp: December 19, 2017, 03:24:39 pm
content: I would say Slipped Probe and Sluggishbootus. However, the latter can be easily remedied by a nearby coffee machine. The former is known to cause InvalidusMetricus, with its more serious variants SparkisAereous or FriedCircuitus.

author: joeqsmith
author_rank: Super Contributor
timestamp: December 19, 2017, 03:47:27 pm
content: It seems like as common as Tinnitus is, they would have included one about saturating the inputs and recovery times. What you see is not always what's there.
Hantek DSO5072P - Page 1
Forum section: electronics / testgear

author: rickselectricalprojects
author_rank: Regular Contributor
timestamp: February 03, 2016, 10:17:30 am
content: Hi everybody,I have been saving up for an oscilloscope for a while now and i wanted to know if this oscilloscope is any good:http://www.ebay.com.au/itm/AU-Post-...370029?hash=item3abc7c5ced:g:xBkAAOxyBvZTP3NGI have looked around online and it is highly rated on Amazon but apart from that I cant seem to find anything else about this scope.Rigol oscilloscope's are too expensive and the cheapest deals i can find are still very expensive and they also come from China, which I think is a bit risky for something that costs $500.Is this Scope worth the $350?Thanks

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: February 04, 2016, 12:16:19 am
content: I say no, see this thread from a couple of days ago.https://www.eevblog.com/forum/testgear/hantek-dso5000p-decision/

author: daybyter
author_rank: Frequent Contributor
timestamp: February 04, 2016, 04:58:45 am
content: 350$ ? Over here it is closer to 250$ .

author: rickselectricalprojects
author_rank: Regular Contributor
timestamp: February 04, 2016, 08:09:39 am
content: Quote from: daybyter on February 04, 2016, 04:58:45 am$350 Is the Australian price.

author: rickselectricalprojects
author_rank: Regular Contributor
timestamp: February 04, 2016, 08:10:48 am
content: Quote from: CustomEngineerer on February 04, 2016, 12:16:19 amThat's a shame, I will just wait longer then and get a Rigol from a good seller.Thanks

author: JohnBee
author_rank: Contributor
timestamp: December 18, 2017, 09:08:07 am
content: I just purchase one and couldn't be happier - no lockups, responsive and quite accurateI'm thinking the FW must have improved since these were last reviewed - then again, I'm not going anything other than basic scope functions with it and so that may have something to do with it.
What would you do with a NOS Tek 465 ? - Page 1
Forum section: electronics / testgear

author: ez24
author_rank: Super Contributor
timestamp: December 17, 2017, 08:24:58 pm
content: HiI have a NOS (new old service) Tek 465 with all the manuals and a audio tape and a current probe. It has about 2 hours of use on it. Seems too nice to use and someday soon I will have to give it up. Other than selling it, what else can I do with it? Seems like it should be on display somewhere not on a work bench.Everything works.Any suggestions on what to do with it? I want it to go to a good home. No overseas shipping, I am in the US.The history is a tech bought it new and a couple of days later died and his wife stored it in a garage and decades later sold it on CL. The buyer did not know how to use it and sold it to me. I think I paid $100 for it. It has been in So. Calif all its life (low humidity).thanks

author: tautech
author_rank: Super Contributor
timestamp: December 17, 2017, 11:26:50 pm
content: KEEP the current probe, you'll never get the chance to have another so cheap.Try and buy a replacement and you'll find out these things demand $ to but.P6021 or 22 with the BNC termination are some of the best ever made.

author: ez24
author_rank: Super Contributor
timestamp: December 17, 2017, 11:59:13 pm
content: Quote from: tautech on December 17, 2017, 11:26:50 pmIt is a P6021 with the BNC terminator. It came sealed in a plastic bag with the manual so it has never been used.Any idea what the tech would have done with this ? I do not know how the P6021 is used.

author: nctnico
author_rank: Super Contributor
timestamp: December 18, 2017, 12:09:28 am
content: Great findPictures please!

author: tautech
author_rank: Super Contributor
timestamp: December 18, 2017, 12:28:05 am
content: Quote from: ez24 on December 17, 2017, 11:59:13 pmIt's a 60 MHz 15A AC current probe....you lucky bugger. I've got 2 that I won't part with.Look at new RRP, it's ~$3kFor any technician to view AC current waveforms this is an indispensable tool.IIRC a 465 has a loop for the probe compensation output, this loop is also a current source to check current probes against.P6021 manual attached.
6114a precision power supply switch problem - Page 1
Forum section: electronics / testgear

author: CopperCone
author_rank: Super Contributor
timestamp: December 17, 2017, 05:07:08 pm
content: So my 6114A has a problem, if you gently hold the 0.x0 switch, on the bottom, the display is correct. If you let go, it shorts it out to the maximum value.How can this be fixed? Bad switch? Bad contacts?Like, gentle pressure on the bottom part of the switch fixes it. This is the type of switch that you press, and it moves the display. It's bang on accurate with light pressure.

author: Vgkid
author_rank: Super Contributor
timestamp: December 17, 2017, 06:56:12 pm
content: I would first check the solder joints on the switch board.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 17, 2017, 07:42:06 pm
content: I've repaired those in two 6114A units, along with the similar switch used in an 8011A signal generator.There may be a thread around here on the topic.Anyway, there is a grease that was put on the gold-plated switching elements. It gets thick, and prevents the contact from taking place, effectively making that string go to the maximum value.Take pictures at each step. Collect containers for the hardware. From I recall the repair procedure is something like:1. Open up the unit and remove the switch assembly board. You will have to desolder a couple wires from the variable resistor. The front plate is a little tricky to remove.2. Desolder the 4-gang switch assembly from the circuit board. A good desolder station is good for this. Use a lot of solder paste and solder wick.3. The switch assembly is probably wrapped up with cloth tape. Peel off the tape.4. The 4 units along with the two sides will slip apart from each other relatively easily.5. The switching element board is heat staked in 4 places. Carefully cut through the mushroomed part and remove it.6. Remove the rotating switch contactor and the element board.7. Clean both the contactor and the element board with alcohol. There was enough that I needed to use a couple q-tips for each one.8. I sprayed on a plastic-safe contact cleaner with silicone lubricant.9. Reassemble, and do the next set.It probably took 2 hours to work out to do the first machine, and probably an hour for the second.

author: CopperCone
author_rank: Super Contributor
timestamp: December 17, 2017, 11:20:16 pm
content: shit, any idea where the brown and white wire goes?It must have been fatigued, it ripped out when I removed the thing. Gotta find a manual...ripped from the main board.never mind, found it. this looks fun.. I think I will use alcohol to clean the switches.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: December 17, 2017, 11:25:29 pm
content: Here is the manual:https://www.keysight.com/en/pd-1000001521%3Aepsg%3Apro-pn-6114A/voltage-source?pm=PL&nid=-536902299.536879741&cc=US&lc=engThe manual seems to not contain wire code colors. Later tonight I can open mine up and see where it goes.
Hp 8591e disabling gate option 105, and gate trigger input questions - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: December 17, 2017, 07:57:12 pm
content: I was going to revive the old thread linked below for these questions, but then I thought it might be better to start a new thread specific to my questions.To start with, I've been questioning the need for a tracking generator when specifically using a spectrum analyzer to align an FM I.F. strip and from what I have found so far is that it's not necessary if you use the max hold, but then I am assuming that makes it harder to see signal changes that are below the max signal held on the screen when adjustments are made that change the signal.I have the version of the HP 8591E that allows for enabling the Gate input option 105 via the software as the gate option hardware is built into the motherboard, reference this thread:https://www.eevblog.com/forum/testgear/hacking-old-hp-spectrum-analyzers/msg421596/#msg4215961st question is that there is one reply that discusses how to enable this option, but nothing about how to disable it. How is that done?2nd question is, would anyone happen to know where the SMB connectors for the Gate input signal is at? Apparently all I need to do is run an SMB to BNC cable from the board to the rear panel. The service manual doesn't specify this. (maybe I missed it)Found the option 105 install PDF.3rd and most important question is whether my thought process is correct in assuming that if I am using a sweeper to generate a 10.6 Mhz to 10.8 Mhz sweep, and it has a gate output, that should suffice and react similar to a tracking generator. Apparently the spectrum has to be centered and spanned accordingly.TIA
Naked !!!  ------ Tek 422 - Page 1
Forum section: electronics / testgear

author: Kilo Tango
author_rank: Regular Contributor
timestamp: December 15, 2017, 12:36:52 pm
content: I just finished working on an old Tek 422 scope and thought you might be interested in some pictures of inside. Everything is beautifully laid out, all cable runs supported, well engineered, the tunnel diodes inside metal cans.All it has needed was cleaning the X10 mag switch, everything else works fine. OK channel 2 variable pot might need replacing but basically that's it.Not bad for a scope that was introduced in 1966.Ken

author: james_s
author_rank: Super Contributor
timestamp: December 15, 2017, 10:03:35 pm
content: Nice, typical Tek quality. Some of the older HP gear from the 70s-80s has a similar level of quality and attention to detail too. This stuff is a work of art.

author: snoopy
author_rank: Frequent Contributor
timestamp: December 15, 2017, 11:33:56 pm
content: An no doubt these scopes and many other TEk scopes were probably used for work on the NASA space missions at the time

author: bd139
author_rank: Super Contributor
timestamp: December 16, 2017, 04:53:00 pm
content: Nice photos - thanks for posting. Can’t beat 1960’s tek scopes. Really nice engineering.
Old version of Benchvue that actually works? - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: December 17, 2017, 09:32:52 am
content: Rant ON:Every once in a while I need to record data from one of the 34401A meters we have via GPIB. This typically happens every 6 months or so. It seems like every time I go to use whatever was working the last time it no longer works. Is it only me or is the Keysight Benchvue software so riddled with bugs that it breaks every time ANYTHING is updated in Windows?Rant offI just uninstalled everything Keysight related and attempted a fresh install with no luck, even the installer fails. I called Keysight, tech support guy was unable to help, told me a developer would call, but no response. Service is really going down IMO.I have read that "older" versions of benchvue still work, I'm not sure what older refers to (version #?), or where these can be downloaded from?Options?

author: HalFET
author_rank: Frequent Contributor
timestamp: December 17, 2017, 11:33:33 am
content: I still have an installer of about a year ago on my desktop at work I suspect, I can send it over tomorrow if you want.

author: Ghislain
author_rank: Regular Contributor
timestamp: December 17, 2017, 03:58:23 pm
content: What you are after is V3.7 (or earlier), it is still available from the Keysight website here:https://www.keysight.com/main/software.jspx?cc=BE&lc=dut&nid=-33002.1080833&id=2417463&pageMode=PV