hybridfree/eevblog-posts huggingface dataset:
[Solved] What's the 4-20ma percentage fuction on DMMs used for? - Page 1
Forum section: electronics / testgear

author: ballsystemlord
author_rank: Frequent Contributor
timestamp: October 13, 2023, 02:45:04 am
content: In the spread sheet here:https://www.eevblog.com/forum/testgear/multimeter-spreadsheet/There's a function listed as 4-20ma. It's explained in the thread that it means that the DMM reads:0% for 4ma50% for 12ma and100% for 20ma.What is this useful for? Like aside from LED current draw?Thanks!

author: ataradov
author_rank: Super Contributor
timestamp: October 13, 2023, 02:53:19 am
content: It is a standard control current for industrial applications.https://en.wikipedia.org/wiki/Current_loop
JDSU JD745B analyser battery replacement / LI204SX battery substitution - Page 1
Forum section: electronics / testgear

author: Technical Mayhem
author_rank: Contributor
timestamp: September 26, 2023, 10:56:41 am
content: Picked up a JDSU JD-745B analyser that came without a battery.It seems to use a somewhat standard battery, the 3S 11.1V 7800mAh LI204SX. I thought about picking up a secondhand battery and repacking it but they're too expensive...Next thought was getting a much less expensive drone battery and sticking it inside the case / hacking the wiring in permanently.Does anyone have info on the LI204SX battery pinout? Looks to be 5 connections so initial naive guess is that 4 are for cell power & balancing while the 5th could be temp.Cheers

author: Hydron
author_rank: Super Contributor
timestamp: September 26, 2023, 02:42:14 pm
content: I'm also in the camp of "oh I'll just eBay a battery" then saw the price and reconsidered.My unit actually came with a battery but it died a while ago (probably over discharge, possibly a bad cell), so I took it apart to try and revive it (a difficult job). Even with some charged cells connected it refuses to enable the output, so there might be some flag set when it initially died. Thankfully it's all off the shelf BMS parts inside with datasheets available so I'll try and reset it via I2C when I get chance.Most of my stuff is currently in storage though so that'll be a while in the future - if I do dig up some photographs of the PCB (I probably took some) I'll post them though.

author: Technical Mayhem
author_rank: Contributor
timestamp: September 26, 2023, 10:20:07 pm
content: Some pics of the battery insides / BMS would be very helpful!I'll have a look at the JD745 side to see what comms it's looking for.Might just end up making up a pack of 6 18650's with a 3S BMS board and an external charger and see if I can get the JD745 ignore any comms signals.Cheers

author: Technical Mayhem
author_rank: Contributor
timestamp: October 04, 2023, 02:30:54 am
content: Hooked up a 12V PSU to the battery connector and the unit was happy enough to boot up. Not sure if it will charge without comms, but there was ~12.7V being provided by the JD745B PSU module with the battery removed...I'm going to make up a pack of 6 18650's and a BMS PCB from eBay. Plenty of room in there.Cheers

author: Technical Mayhem
author_rank: Contributor
timestamp: October 13, 2023, 12:06:20 am
content: Just some info for others that come across this:The unit will charge the batteries at 1.5A and drop off to 0A as they approach about 12.6V.Unit will disconnect about 9.6V.
Leader LMV-87A Manual - Page 1
Forum section: electronics / testgear

author: W3KW
author_rank: Contributor
timestamp: October 12, 2023, 03:31:57 am
content: It's as if Leader never made this thing. Zero intel on the internet. People searching for a manual that never existed.Do you know where I can find a manual for the Leader LMV-87A? Not one that's close. Not the 181 please. The actual -87A manual.Unobtanium?Thanks,WesW3KW

author: enut11
author_rank: Super Contributor
timestamp: October 12, 2023, 08:31:43 am
content: Try emailing Leader Electronics Japan. They have helped me in the past with info on obscure obsolete gear.enut11https://www.leader.co.jp/en/products/discontinuation/

author: enut11
author_rank: Super Contributor
timestamp: October 12, 2023, 08:37:27 am
content: Nakmandan on Tapeheads has three and claims docs are availablehttps://www.tapeheads.net/threads/shopping-for-analog-millivoltmeter-which-one-to-buy.74013/
Lecroy Wavepro 7k - how to save auto-cal settings? - Page 1
Forum section: electronics / testgear

author: mrcy22
author_rank: Contributor
timestamp: October 09, 2023, 05:49:14 pm
content: I'm talking about saving this setting in the service menu. Every time I turn off the oscilloscope, the settings are reset to the values as in the photo.

author: Nx-1997
author_rank: Regular Contributor
timestamp: October 09, 2023, 08:42:32 pm
content: The settings in the Service menu cannot be saved as they are not meant to be accessible by regular users on a daily basis, I think. Also, I am curious do you also get these peaks with no signal attached to the input channel. All my lecroy scopes show these peaks.

author: mrcy22
author_rank: Contributor
timestamp: October 10, 2023, 08:29:06 pm
content: It's similar to yours.

author: DaJMasta
author_rank: Super Contributor
timestamp: October 11, 2023, 05:23:12 am
content: I think those are the subsets of the saved autocal routine references you can redo from that menu, not a selection of which ones are performed when the instrument autocals.To the other poster, yes you get some peaks in the lower range of the FFT which is internal clock generation spurs coming through.

author: mrcy22
author_rank: Contributor
timestamp: October 11, 2023, 04:19:39 pm
content: Quote from: DaJMasta on October 11, 2023, 05:23:12 amIt's really turning off the autocalibration. When switching ranges (both vertical and horizontal) there is a few seconds of autocalibration which is an annoying delay when I don't need to know the exact signal parameters. If I turn off the above options, everything goes quickly without autocalibration.
Tek 2215 Scope Usage With Probe Set to 1X? - Page 1
Forum section: electronics / testgear

author: Henry Finley
author_rank: Regular Contributor
timestamp: October 10, 2023, 02:55:17 am
content: I am working on a Teac A4010GSL tape recorder that has some noisy transistor crackle. FIRST, keep in mind that this recorder has no power output for speakers. This means that the so-called " final output transistor" is still a low-level device meant to amplify only enough to plug into my Pioneer receiver tape input. My Tek 2215 is equipped with a cheap Chinese 1x to 10x switchable probe. As a rule I always leave it on 10x. I'm having a hard time finding where the transistor crackle is in my Teac. It does show up at the collector of the last transistor with the scope set to full sensitivity, but just barely. But that doesn't mean that it's the final transistor that is the faulty part. There are 5 or 6 transistors before it. If I were to switch the probe to 1x to probe for my crackle in earlier transistor stages, would I have a chance to find my transistor crackle, or would general noise fool me into thinking that I was seeing my crackle problem? Thank you.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: October 10, 2023, 10:45:28 am
content: Sometimes a soldering iron and freeze spray work better than a scope finding transistor niose problems.I have many different probes but my main use is a modified P6006 1x probe and a 2225 for tracking audio signals.Jeff

author: Henry Finley
author_rank: Regular Contributor
timestamp: October 10, 2023, 08:35:26 pm
content: Well today I gave it a shot and set the probe to 1X and turned down the vertical gain. Guess what? It turned up a number of noisy transistors that the 10X setting wasn't showing.
Rigol DHO924S proper ground connection? - Page 1
Forum section: electronics / testgear

author: fleckingerre
author_rank: Newbie
timestamp: October 10, 2023, 02:32:14 pm
content: Hi!My new Rigol DHO924S arrived these days. With the extra ground lead, since the new scopes are not grounded directly through the power supply anymore. Now I was wondering what actually is required for this ground connection? The manual isn't very specific and searching with Google just reveals a plethora of tips on "how not to blow your scope".Is it enough to use a ground plug with 1 MOhm resistance for ESD protection, or does it require a low resistance connection to ground? I found different products and am wondering what is the right choice.Many greetings!Remo

author: Fungus
author_rank: Super Contributor
timestamp: October 10, 2023, 03:19:45 pm
content: Quote from: fleckingerre on October 10, 2023, 02:32:14 pmIt has to be a real ground connection, low impedance.It's there for your safety in case you clip onto a live mains wire then touch one of the exposed BNC connectors.It doesn't make any difference to the measurements, it's purely a safety thing when working on dangerous voltages. You don't need it if you're working with Arduinos, etc.

author: 2N3055
author_rank: Super Contributor
timestamp: October 10, 2023, 05:24:55 pm
content: Quote from: fleckingerre on October 10, 2023, 02:32:14 pmRemo,Since you are in Austria, just buy a Schuko power plug, connect only ground connector (Yelow-green wire, use multistrand soft wire 1,5mm2 or 2.5mm2 wire area) and plug it in a wall Schuko grounded socket... Connect this wire to grounding point on scope. This is exactly how it is done internally for scopes with built in PSU..Best,Siniša
Anyone using a HP 4155/4156? - Page 1
Forum section: electronics / testgear

author: chilternview
author_rank: Frequent Contributor
timestamp: October 10, 2023, 07:53:43 am
content: Although there's a few people who have the HP 4145 semiconductor parameter analyzer, there doesn't seem to be many who have the later 4155/4156. I'd be interested in sharing tips, fixes etc with any who do.
Siglent SDS2104 Oscilloscope unlock - Page 1
Forum section: electronics / testgear

author: Joe_echo
author_rank: Contributor
timestamp: October 12, 2023, 03:02:32 pm
content: Hello all,I have done a search on the forum but not found any firm info for my specific scope.Now this is the original SDS2104 not the X or plus model.The options it apparently has areAWGDecodeMSOPASThese are all trial versions currently. Is there a way to unlock it? It would also be good to upgrade the bandwidth if possible.Thanks in advance

author: tautech
author_rank: Super Contributor
timestamp: October 12, 2023, 06:36:28 pm
content: Some info here:
Audio/frequency generator as a phone or PC app - Page 1
Forum section: electronics / testgear

author: RiRaRi
author_rank: Regular Contributor
timestamp: October 09, 2023, 10:05:25 pm
content: How good are phone and PC apps as a sig and freq gens? Can they be used as a proper test equipment since the actual devices can be very expensive?

author: Aldo22
author_rank: Super Contributor
timestamp: October 09, 2023, 10:37:42 pm
content: Quote from: RiRaRi on October 09, 2023, 10:05:25 pmThe signal quality depends largely on the smartphone.Of course, it only works in the audio frequency range anyway.For example:https://www.keuwl.com/FunctionGenerator/Just try it, it's free.But I think even a cheap function generator like the FeelTech FY3224S is much better than that.

author: bdunham7
author_rank: Super Contributor
timestamp: October 09, 2023, 10:52:57 pm
content: Quote from: RiRaRi on October 09, 2023, 10:05:25 pmPC soundcards are pretty good in every way except setting the exact amplitude, you need a good meter to calibrate them if you do it that way. Just using the built-in sound on a good motherboard is fine too, although sometimes the noise specs aren't quite as good as they could be. No idea on phones, I don't know if they actually aim for a flat frequency response in the first place.

author: DaJMasta
author_rank: Super Contributor
timestamp: October 10, 2023, 12:04:05 am
content: You can get tone generators and if you get software to generate your own waveforms, just normal playback is effectively an arb gen. It's plenty capable for what it is, but you'll be missing a bunch of things over a standard sig gen sort of by definition: limited ranges (no ranging, generally), limited output load settings, no calibrated output level (and it will vary with loads because they're not designed to try to), limited output bandwidth, and with default software, the waveforms available are going to be just sound files or very basic tone generation (though if you find the right stuff or the right synth, it's certainly all possible).For some applications, a sound card may do just as well if not better, but a proper function generator is going to have a lot more flexible output and will have an interface better suited to what's typical of electronics work.
t7 tester fault? - Page 1
Forum section: electronics / testgear

author: p.larner
author_rank: Frequent Contributor
timestamp: October 15, 2023, 07:36:12 am
content: just got this t7,if i short the 3 top left pins and press the button it just says testing and just displays bat v 3.96v,from what i know it should go into selftest?,with nothing conected it shows 2 diodes both wth a 2.4v vf,is it busted?.
brymen 789 / eevblog 786 case?? - Page 1
Forum section: electronics / testgear

author: mastershake
author_rank: Frequent Contributor
timestamp: October 09, 2023, 12:02:12 am
content: what case does everyone use for their 789 (or 786) looking for a semi hard case doesnt have to be anything fancy but i def want a nice snug fit so its not flopping around in there. and needs to have something for the leads. id prefer something that has some sort of protection between the pocket for the leads and the front of the unit so it doesnt scratch the screen all up like a flap or something i have a case but its one of the flimsy ones and i have to remember to make sure the unit is face down so it doesnt get all scratched up. it fits my fluke case pretty well but im not spending that much ever again on a case lol and its not even that great of a case. ill try a couple more from amazon and see if i can find a better one unless someone has any suggestions for me to check out. i dont mind up to around maybe 30$ but anymore seems like its to much from the quality i have been seeing lately. thoughts? also looking for one for the 121GW but i tend to use the other two more often so unless i find a good deal those will come first. i appreciate any input. i do want one that is semi rigid though not one of the thin canvas single layer paper thin ones.

author: J-R
author_rank: Super Contributor
timestamp: October 09, 2023, 08:38:23 pm
content: The official Brymen cases have a decent felt liner and the EEVBlog case has a thin layer of padding between the inner and outer layers of fabric. Both provide a reasonable amount of protection to the DMM and are generally designed to allow the leads to be folded up to the left or right of the DMM while stored in the case. Welectron has both cases listed, but I wonder if the EEVBlog case has been discontinued... Dave?Neither are "single layer paper thin", but of course are also not quite comparable to an EVA case. There are tons of EVA cases available all over the 'net, so just start searching for something with the right dimensions. You can cut some foam in the shape of the DMM and the accessories.
Difference R&S modular probes to active single-/differential - Page 1
Forum section: electronics / testgear

author: VanBudd
author_rank: Contributor
timestamp: October 06, 2023, 05:54:40 am
content: Hi,I would like to ask about the differences from the R&S RT-ZM modular probe system to the normal active probes (single ended/differential).The RT-ZM probes can switch between single-ended, differential and common mode.So if i understand that correctly it basically can do all the measurements with just one probe.The only differences i could find with my basic understanding and short research are the dynamic range and DC input resistant.Im just curious, in what scenario would you use the single ended or differential active probe over the modular system?So my real question is, which scenarios are not working for the modular system?At my work we are currently deciding if we want to purchase the R&S MXO4 as a good common use oscilloscope and which accessories we should buy.So i was thinking the best option for the most scenarios would be the modular system.Im not that familiar with high end measurement equipment, so please excuse me if im clearly overlooking something here.

author: alm
author_rank: Super Contributor
timestamp: October 06, 2023, 09:18:09 am
content: How does the noise compare? Any differential probe can be used as single-ended probe by connecting the inverting input to ground. But the downside is usually higher noise than a true single-ended design.

author: VanBudd
author_rank: Contributor
timestamp: October 06, 2023, 10:09:00 am
content: Quote from: alm on October 06, 2023, 09:18:09 amFrom the datasheet, noise voltage on the modular probe (referenced to probe input) is 5.4mV(RMS), on the active differential probe 2.4mV for the 1.5GHz version and on the active single ended probe it is 1.6mV for the 1.5GHz version.

author: VanBudd
author_rank: Contributor
timestamp: October 09, 2023, 05:12:43 am
content: So the main difference is a little bit more noise?Can someone confirm that then the best option for most variety of scenarios is the modular system?
R&S RTE oscilloscope - service password searched - Page 1
Forum section: electronics / testgear

author: Jörg
author_rank: Regular Contributor
timestamp: October 08, 2023, 12:12:24 pm
content: Hello.Does anyone here know the service password for the R&S RTE oscilloscopes?I would like to readjust the internal time base. But this only seems to be possible in the service menu.I would be happy if someone could post this here.Thanks. Jörg

author: jjoonathan
author_rank: Frequent Contributor
timestamp: October 09, 2023, 02:17:57 am
content: Do the RTO passwords ("16052008f" and "894129") work?

author: Jörg
author_rank: Regular Contributor
timestamp: October 09, 2023, 04:09:16 am
content: Hello and thanks.Unfortunately it didn't work with the RTO passwords.These are the only ones I found here on the forum and tried out a while ago.
HP 3314A Error code 31 and 36 sometimes 34 - Page 1
Forum section: electronics / testgear

author: BoscoLab
author_rank: Contributor
timestamp: October 07, 2023, 03:46:06 pm
content: I still haven't found the problem with the HP 3314A. Too little amplitude in the calibration range. Error code 31 and 36, sometimes 34. I have already replaced the following components. LM393, SN74LS279AN and SN74LS125AN in the A8/A1 board.Who has an idea and can help?thanksRudolf

author: pqass
author_rank: Super Contributor
timestamp: October 07, 2023, 04:28:40 pm
content: There are a number of connector/cable issues with this model.See the following parts 1 and 2 for general refurbishment, troubleshooting, and circuits operation.

author: BoscoLab
author_rank: Contributor
timestamp: October 08, 2023, 07:20:37 am
content: Thanks, I have already seen the videos and the only thing I can still try is to change the cables. I will give it a try.

author: BoscoLab
author_rank: Contributor
timestamp: October 08, 2023, 01:08:01 pm
content: I have changed the cables. No change, the error is still there.

author: wn1fju
author_rank: Frequent Contributor
timestamp: October 08, 2023, 09:56:41 pm
content: If you haven't already, run through the complete calibration/adjustment procedure. The 3314A attempts to correct itself, but it can only adjust its parameters over a short range and it assumes they are close to begin with.My 3314A will often throw a Error 31 (frequency error exceeds correction capability). I can usually get rid of that error by following the frequency accuracy calibration adjustment described in section 5.9 (at least, that's the section number in my version of the service manual).
SojaLab dProbe1000 - Page 1
Forum section: electronics / testgear

author: slugrustle
author_rank: Frequent Contributor
timestamp: October 08, 2023, 06:57:14 pm
content: I was searching around for reasonable cost low voltage active differential probes and stumbled on theSojaLab dProbe1000.It claims 900MHz bandwidth, 10x attenuation, output into 50Ω, ±15V differential input range, ±30V common mode input range, ±40V peak. Input impedance appears to be 110kΩ / 2pF each side to GND and 220kΩ / 1.8pF differential. Power is through USB micro B connector. Signal output is SMB.They're selling on ebay for 455EUR / ~480USD at time of writing. I'm tempted but would need to save up for this. Would also be nice to see more input connection accessories than appear to be offered.
DMM6500/DAQ6510 Where do these extra digits come from? - Page 1
Forum section: electronics / testgear

author: Chance92
author_rank: Regular Contributor
timestamp: October 07, 2023, 09:53:15 pm
content: I recently tried the logging feature of a DAQ6510 and downloaded the data to a PC. To my surprise, the voltage measurements in the logged data contained much more digits than 6.5. I used 12 NPLC, 1 data count and no filter. Does the meter use some sort of pre-filter to produce these digits? If so, what's point?

author: Kleinstein
author_rank: Super Contributor
timestamp: October 08, 2023, 11:24:39 am
content: The ADC itself has more resolution than the display, especially with a relatively long 12 PLC. This extra resolution is kind of hidden in the noise and thus not really useful to display (makes it noisy to watch), but may still be OK to the PC (never mind a few noisy bits). The extra resolution also heps to reduce rounding errors from using a numerical scale / calibration factor. The result is just a floating point number with what ever number of digits the firmware decides to show. This can also be more than the ADC resolution and especially with older meters one can sometimes see the steps that could be something odd at around (but not exactly) 1/10 the display steps.
Tektronix 2212 error  f=1000 - Page 1
Forum section: electronics / testgear

author: j03m4r13
author_rank: Newbie
timestamp: May 15, 2017, 09:18:09 pm
content: Hi guys,Anyone who has an idea what's the error meant by, "error: f=1000 v=25" being displayed onTek 2212 after pressing the Auto button?Cheers,Joe

author: niino
author_rank: Contributor
timestamp: October 06, 2023, 06:13:48 pm
content: Very late answer, but this thread comes up when searching on google for this error message, so I want to give an answer for people having the same issue:In my case, this error happened due to a severe miscalibration of the trigger. To fix this, you need to boot in service mode (set the jumper on the CPU board) and run the trigger calibration routine. You need some function/signal generator capable of generating a 6 Vp-p sine at 100 Hz (if I remember correctly) for this. Once this has finished properly, the error should disappear.
UT210E eprom revival - Page 1
Forum section: electronics / testgear

author: marce002
author_rank: Regular Contributor
timestamp: October 05, 2023, 06:15:07 pm
content: Hi allI have been trying to flash the ATMEL chip via my ch34a programmer and i initially wired everything (5 cables) directly to the board 1-2-3-4 all gnd and so on... it did not work, then removed the chip from the board but cannot read the memory with my ch34a , no way.... in case the eprom is damaged what are the symptoms turning on the clamp? because now it shows some strings like random and then staus forever at DC 000.0 but measures nothing.... i imagine that the chip is empty... what can i do?

author: coromonadalix
author_rank: Super Contributor
timestamp: October 05, 2023, 08:53:52 pm
content: ask uni-t to provide the content and or wait for someone here to help you

author: marce002
author_rank: Regular Contributor
timestamp: October 05, 2023, 09:03:35 pm
content: fixed with another chip found around at 24c02N and also modified my ch34 to 3.3v pins 9 and the first as the diagram lying around.thks__________________Marcelo J
Need schematic for HP 4193A probe - Page 1
Forum section: electronics / testgear

author: johnny_canuck
author_rank: Contributor
timestamp: December 18, 2017, 10:44:44 pm
content: The manuals that are available on-line for this instrument don't include schematics. I just need the schematic for the probe (boards A51 & A52) and (I may be stretching my luck here) the IF channel amplifiers A3 & A4. If these have been posted somewhere, please let me know where. Thanks very much for any help.Ken, VE3FIT

author: alm
author_rank: Super Contributor
timestamp: December 18, 2017, 11:34:50 pm
content: If you can't find it for free, you should be able to buy a high quality scan here:http://artekmanuals.com/manuals/hp-manuals/.

author: nikodem
author_rank: Regular Contributor
timestamp: October 06, 2023, 10:21:09 am
content: Any luck with that? I am also searching for the probe schematics as well, as schematic for other boards.
Symmetricomm S600 / S650 - Page 1
Forum section: electronics / testgear

author: Sparky
author_rank: Frequent Contributor
timestamp: October 09, 2023, 04:13:41 am
content: Hello friends!I startedthis threadin Metrology a few weeks back on the Microchip/Microsemi SyncServer S600 / S650 time server. More test equipement people hang out here so just cross-posting here for curious folks here. Check it out for some teardown photos!BTW, I am looking for a firmware update for S600 or S650? Would be super helpful!Cheers!

author: tautech
author_rank: Super Contributor
timestamp: October 09, 2023, 04:31:46 am
content: As OP you have the Move Topic feature at the bottom of the page which allows you to move it around the whole forum to where it might get best exposure and even finish with it back where it started.However, don't use the Supporters lounge as only a Moderator can shift it from there.Don't ask
Agilent Multimeter U1252B Blown up - Page 1
Forum section: electronics / testgear

author: kevinsagen47
author_rank: Newbie
timestamp: October 06, 2023, 02:38:27 am
content: Two of my company's U1252B have burnt mark traces in their PCB.I don't recall doing anything weird.I was measuring the voltage and frequency of 1000Vrms signals.Peak-to-peak voltage is max 3000V (which is higher than the written 1000V max), shouldn't it give me a warning or something?I used the same rated CAT III 1000V Fluke 289 and 87V, and they are both perfectly fine.I even used the BM235, which is only rated for CATII 1000V, no problem!What should I do with them? Use them as paperweights?

author: bdunham7
author_rank: Super Contributor
timestamp: October 06, 2023, 02:59:19 am
content: I'd say they're toast. This 3000Vp-pAC voltage, is it symmetrical or is there a DC component? IOW, what is Vpkor the absolute peak voltage at any time?I'm glad your other meters didn't blow up, but when I'm looking at high voltages like this where I don't actually know what the signal might look like, I prefer to use a HV divider probe like the Fluke 80K-6.
Embedded Multimeter for ATE - Page 1
Forum section: electronics / testgear

author: labnet
author_rank: Contributor
timestamp: October 06, 2023, 06:05:06 am
content: Does anyone know of anything cheaper than Keysights U2741A for a headless 5.5digit multimeter?Its USD2000.

author: coromonadalix
author_rank: Super Contributor
timestamp: October 06, 2023, 10:40:29 am
content: well you have the usb like thesesand pci pci-e pxi interfaces cards too, sometimes they can be snatched at very low pricessome pcmcia cards tooor find some meters who can be controlled by usb / rs232 / lan, like the L4411A meter or any brand ...Some L4411a can be purchased in the 500$ usdor you need meters with scan cards Ie: more inputs ??Keithley 2700 seriesHP Agilent 34970Siglent dmm, one series can have a scan card .....
HP 8153A Lightwave multimeter - does not power up - Page 1
Forum section: electronics / testgear

author: asilva10
author_rank: Contributor
timestamp: October 26, 2018, 03:46:19 pm
content: I have a HP8153A that does not power up. I was not able to find any schematics or service manual for this instrument.I made quick measurements at the power-supply board (HP P/N 08153-66503) and it seems that the input stage is okay and after the rectification I have +165V (input 110Vac). But after the switching stage, no voltage level. I cannot detect any sign of "oscillator on". I believe that the driver is a component Q101, but I am not sure.I tried to look at eBay and found a lot of these instruments with the same problem (no power). Any hint?

author: Jwalling
author_rank: Unknown
timestamp: October 26, 2018, 03:55:37 pm
content: There's a 8 pin DIP that controls the switcher, I forget the part #. Replace it and you'll be good to go. I've fixed at least 10 of these in the past where that chip was bad.

author: asilva10
author_rank: Contributor
timestamp: October 26, 2018, 04:09:12 pm
content: @Jwalling - thank you!! Yes, I found: TDA4605 - a switching controller - it must be this guy!!I will let you know. Thanks!

author: asilva10
author_rank: Contributor
timestamp: November 02, 2018, 05:55:27 pm
content: Problem solved: put a 8-pin DIP socket and installed a new TDA4605. Everything working now !!

author: Jwalling
author_rank: Unknown
timestamp: November 03, 2018, 09:48:02 am
content: Quote from: asilva10 on November 02, 2018, 05:55:27 pmFor some reason, the chips made in Austria have a high failure rate.

author: K9DTV
author_rank: Contributor
timestamp: May 14, 2021, 11:10:13 pm
content: Quote from: Jwalling on November 03, 2018, 09:48:02 amI picked up a non-working HP 8153A with plugins and went looking for schematics, found nothing!Ended up reading this post and ordered the TDA 4605 after reading this threat.Got the chips in today and unit is up and running, Thanks for your post on this, and I made sure the parts where not made in Austria.

author: Jwalling
author_rank: Unknown
timestamp: May 15, 2021, 08:15:30 am
content: Quote from: K9DTV on May 14, 2021, 11:10:13 pmYou're welcome. There's also an NTE equivalent part that works. Part is NTE7154

author: picburner
author_rank: Frequent Contributor
timestamp: June 10, 2021, 06:33:45 am
content: If it can be useful in the attachment there are the power supply's schematics.

author: rammer
author_rank: Newbie
timestamp: October 05, 2023, 07:45:00 pm
content: Hello,I had the same problem, the mainframe was dead. I have replaced the switching IC and after that the power supply looks OK (correct voltages). The 8153A starts but the keys do not work and an inserted source can not be enabled.The mainframe did work prior to the issue flawlessly.Any ideas?Rainer
New scope by Rohde & Schwarz? - Page 1
Forum section: electronics / testgear

author: fmzambon
author_rank: Contributor
timestamp: October 04, 2023, 11:00:02 pm
content: I hope it's not a repost, but I stumbled across this page:https://www.rohde-schwarz.com/us/products/test-and-measurement/oscilloscopes/promotion/next-generation_255909.htmlMaybe MXO 3?

author: gslick
author_rank: Frequent Contributor
timestamp: October 04, 2023, 11:22:32 pm
content: Quote from: fmzambon on October 04, 2023, 11:00:02 pmhttps://www.eevblog.com/forum/testgear/rs-to-launch-mxo5

author: fmzambon
author_rank: Contributor
timestamp: October 05, 2023, 06:53:19 am
content: Doh! I missed that thread!
Keithley 2000 full schematic - Page 1
Forum section: electronics / testgear

author: pico61
author_rank: Contributor
timestamp: April 06, 2014, 06:00:41 pm
content: I don't know if it's aware of the forum but to the linkhttp://dev.xdevs.com/attachments/download/672/K2000.pdfis available the full schematic of Keithley 2000 multimeter. The information about the job is available to the linkhttp://dev.xdevs.com/issues/874.The Xdevs guys have done a wonderful job making the reverse engineering of pcb of Keithley 2000!

author: fichamba
author_rank: Contributor
timestamp: October 03, 2023, 04:53:26 pm
content: Sorry, Pico61, I can't DL the schematic from your provided link, because it asks me for log and pass. Do you know how to obtain this schematic? (in fact, I need the Keithley 2015 schematic, but I think it isn't available),TIA!

author: JohanH
author_rank: Frequent Contributor
timestamp: October 03, 2023, 05:12:38 pm
content: xdevs.com seems messed up nowadays. Archive.org has the pdf you are asking for:https://web.archive.org/web/20230223024146/https://dev.xdevs.com/attachments/download/672/K2000.pdf
Lecroy 9410 firmware - Page 1
Forum section: electronics / testgear

author: ihackthestate
author_rank: Newbie
timestamp: April 15, 2022, 09:42:37 am
content: I'm trying to find the firmware for the lecroy 9410 DSO. There is a version 5.2 mentioned on the usergroup, it does not appear to be on the site they link and I cant seem to find it anywhere. I've noticed my lecroy 9410 is on version 4.1 and would like to know if any new functionality popped up. I can dump and upload my firmware before I update if anyone is interested (assuming the 5.2 firmware is out there and I will upgrade).

author: fozzyvis
author_rank: Regular Contributor
timestamp: October 04, 2023, 07:33:23 am
content: I've found a brochure on the device that says "Additional firmware can be installed in the 9410 to allow filtering, EXTREMA, complex mathematics and FFT spectral analysis.".That sounds nice enough, but I haven't found a newer FW for mine (which is at 05.2)
Manual needed for Power Mate Corp "Lectra-Load II" LL300B - Page 1
Forum section: electronics / testgear

author: jacksradio
author_rank: Contributor
timestamp: May 12, 2016, 05:53:38 am
content: Looking for a user manual or service manual for a Power Mate Corp "Lectra Load" electronic load, model LL300B. A scan or link would be much appreciated!

author: jacksradio
author_rank: Contributor
timestamp: May 12, 2016, 11:56:02 am
content: Quote from: RobertoLG on May 12, 2016, 06:17:54 amNo Luck, but thanks for the suggestion

author: Fraser
author_rank: Super Contributor
timestamp: May 12, 2016, 12:20:08 pm
content: Suggest you add the equipment name to your title as many will not just click on 'manual wanted' hope you find what you needFraser

author: jacksradio
author_rank: Contributor
timestamp: May 12, 2016, 10:17:10 pm
content: Quote from: Fraser on May 12, 2016, 12:20:08 pmGood Suggestion, Thank You

author: jacksradio
author_rank: Contributor
timestamp: May 16, 2016, 10:03:51 pm
content: bump

author: sperb
author_rank: Contributor
timestamp: October 04, 2023, 02:26:14 am
content: Ressurrecting.....https://archive.org/details/rte_powermate_ll300b_operationservicemanual
TM5100 Gaussmeter: trying to buy one. but from where? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: October 03, 2023, 02:56:18 pm
content: This is one of those "vague" products with an indeterminate OEM and lookalikes everywhere.Can anyone recommend a specific storefront I can buy from? Delivery to Chicago. Thanks!
Schaffner/Teseq CDN 116 documentation needed - Page 1
Forum section: electronics / testgear

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 25, 2016, 12:51:18 pm
content: Does anyone have a datasheet, manual or other documentation for the Schaffner/Teseq CDN 116?

author: gerber
author_rank: Newbie
timestamp: October 03, 2023, 10:52:35 am
content: Did you get hold of anything? I would be interested in the same. I can only find for 117/118

author: AndersJ
author_rank: Frequent Contributor
timestamp: October 03, 2023, 10:59:51 am
content: Unfortunately not.
AWA F242A - Page 1
Forum section: electronics / testgear

author: Haasje
author_rank: Newbie
timestamp: March 08, 2019, 01:07:27 pm
content: I am looking for service manual+schematics for an AWA f242A distortion meter with serial number 265. On the web the manual for serial numbers 586 and higher (revised) is available but this differs too much to make my repair of the beast possible. Can anyone please help me?!

author: Kitski
author_rank: Newbie
timestamp: October 03, 2023, 03:04:19 am
content: Hi Haasje,I can help you here if you still need a schematic - and a generic manual may be found on the web. Note - there are 2 (maybe 3) manuals available following major circuit (and PCB) changes.I have schematics for the early models and are in A0 (dyeline) size. I will have to separate & reduce them - you will have to 'join' them together !I have later schematics and they are paper copies and not the best quality, but can send you a copy. With the dyeline prints as a 'helper', it's not difficult to figure out part numbers etc in the poor quality schematics.This will take a week or so to organise and I'm located in Canberra, Australia. Please PM me at: VK1LL@iprimus.com.auTell me what your problems are and I may be able to help you as I know these devices quite well.Regards,Kit
Old firmware for Keysights - Page 1
Forum section: electronics / testgear

author: diablodude64
author_rank: Contributor
timestamp: October 02, 2023, 07:10:45 pm
content: Hey all,I have a dso-x-2012a scope and it's currently bricked. I have added wires to the UART setup and am able to see some u-boot information as the machine is trying to start. I am following another forum post on here explaining how to repair the nand corruption which this one appears to have. (Thanks to this forum for all the useful info!)Looks like I need version 2.35 firmware and Keysight doesn't list any of their older firmwares online and the links in the posts I have found are dead... Does anyone know where I can obtain this?Much appreciated!

author: diablodude64
author_rank: Contributor
timestamp: October 02, 2023, 07:32:06 pm
content: Found functioning links. For anyone else who might be looking and needing a shortcut:https://www.eevblog.com/forum/testgear/dsox2000-and-3000-series-licence-have-anyone-tried-to-hack-that-scope/1500/
Thurlby Thandar TA2500 Logic Analyser Manual / Service manual  I need it! - Page 1
Forum section: electronics / testgear

author: Force42
author_rank: Newbie
timestamp: October 02, 2023, 07:28:47 pm
content: Hello i am new and hope i do this the right way.I am searching for the operators manual and service manual for the Thurlby Thandar TA2500 Logic AnalyserI have found the schematics for TA2000 at ko4bb but no more.Please help me to find it and you can mail me robertfors42@gmail.com (or how it works)I have tryed to mail Thurlby TTI but no answer.
Kaiweets KM601S and KM602 question.  - Page 1
Forum section: electronics / testgear

author: Hvacr3ch
author_rank: Newbie
timestamp: October 02, 2023, 03:10:24 pm
content: Hi everyone I am new to the blog. I actually just bought 4 different Kaiweets products think they are amazing. I also have UEI the new one DL599, Ideal 61-757 Fluke 87V (2) Klein CL800. All of them work great. I am amazed at the 4 newer Kaiweets models I bought the KC602, HT208D, KM601S and KM602, last two have lithium batteries. The HT208D has been out for a while as we all know.The Kaiweets tech support team sent me a video on how to change temperature unit default and also modify temperature offset since my HT208D was a couple degrees off.Does anyone know how to get into that same mode on the KM602S and KM601? I already tried a series of buttons to press while powering it up without any luck. Since it’s Chinese holiday, they won’t be back until October 7. I was just wondering if anybody had any clue on how to get into maybe it’s called service mode?
8565E Spectrum Analyzer Spurious Tone - Page 1
Forum section: electronics / testgear

author: tec5c
author_rank: Frequent Contributor
timestamp: October 02, 2023, 09:24:20 pm
content: When looking at a 27.5 GHz tone directly from a signal generator (set to -5 dBm), the 8565E series shows a spurious tone which is ~25 MHz below the wanted tone. See attached.This has been replicated with multiple generators from different manufacturers and on two different 8565E spectrum analyzers. The spurious tone is only present around 27.4 - 27.5 GHz main tone input and seems to disappear or gets buried in the noise at 27 and 28 GHz.Any ideas what may be causing this?
Owon XSA805 (TG) - Page 1
Forum section: electronics / testgear

author: StevenWithAVee
author_rank: Contributor
timestamp: October 01, 2023, 12:48:44 pm
content: Hi,I don't see much on the Owon XSA805 with TG on the web. I recently grabbed one, and I have a specific question:Is there a display mode that will show all the peaks in a table, automatically. Would be super-useful when checking for sprogs and harmonics. Otherwise you have to manually set the markers every time you change transmit DUT frequency, which is OK, but tedious.Thanks!

author: StevenWithAVee
author_rank: Contributor
timestamp: October 02, 2023, 05:59:26 am
content: *bump*. Anyone got one of these?
Looking for replacement HP 8662A button - Page 1
Forum section: electronics / testgear

author: retrev
author_rank: Contributor
timestamp: October 01, 2023, 08:50:27 pm
content: I've got an 8662A that works perfectly (still in spec even) except for a missing button. The Span Freq button is a 0.5" square, dark gray button. Looks like the internals are there, just missing the button cap. Anyone have a source for these? I'd settle for something that's the right size with the wrong label (Start Freq, End Freq, etc.). Willing to pay a reasonable price if you've got one. I'm not interested in buying another parts unit just for a button.

author: Tony_G
author_rank: Super Contributor
timestamp: October 01, 2023, 09:28:46 pm
content: You might be better off just creating a 3D model and printing the cap again - If the piece that is heat staked is still okay then people have reported good results with replacing the spring metal with a piece of feeler gauge.Check out the HPAK group and search for Bill West Switch -https://groups.io/g/HP-Agilent-Keysight-equipmentTonyG
looking for hacking idea to install 1GHz reference input port for E8257D - Page 1
Forum section: electronics / testgear

author: emm386
author_rank: Newbie
timestamp: October 01, 2023, 08:05:27 pm
content: The current E8257D signal generator I have only outputs 1 GHz reference output. Recently, I need to synchronize two E8257Ds at higher reference clock to imporve the long-term phase coherency.When I purchased these E8257Ds, I did not add H1S option, which allows you to have 1 GHz reference input.I looked at the service manual and did some checking from my end, and it seems to me there is a chance I can allow external 1 GHz reference clock in by hacking A7 board (E8251-60348), but wonder if there is anyone who tried this idea before.what do you guys think about this?
Amprobe AM-270 "Auto Leads Resistance Calibration" - Page 1
Forum section: electronics / testgear

author: mwb1100
author_rank: Frequent Contributor
timestamp: October 01, 2023, 06:52:53 pm
content: I came across thismanual entry for an Amprobe AM-270feature that I wasn't aware of:QuoteAnyone know what the technology behind that is? Presumably it's different/better in some way than using the rel function to zero out the leads, or there wouldn't be any reason to bother putting it in.Do any other Brymen meters have this? (the AM-270 is an rebadge of the Brymen BM817)
Rigol DG5000 - Anyone has one? - Page 1
Forum section: electronics / testgear

author: tv84
author_rank: Super Contributor
timestamp: May 04, 2019, 06:23:42 pm
content: Hi,I wonder if anyone has one? Happy with it?

author: TopLoser
author_rank: Unknown
timestamp: May 04, 2019, 06:53:52 pm
content: You fancy playing games with one?

author: tv84
author_rank: Super Contributor
timestamp: May 04, 2019, 07:27:55 pm
content: Yep.

author: TopLoser
author_rank: Unknown
timestamp: May 04, 2019, 07:35:53 pm
content: No licences for frequency upgrades or number of channels?Wonder if there are real hardware differences?I’d be surprised

author: Njk
author_rank: Frequent Contributor
timestamp: October 03, 2023, 01:42:52 pm
content: It seems the project name for the 16-bit generators is Sardinha. I wonder what's the project name for the DG5000 serie?

author: Njk
author_rank: Frequent Contributor
timestamp: October 04, 2023, 02:02:45 pm
content: BTW I think there is a typo in the user manual. In the Arbitrary Waveform Output chapter, it is stated that the normal mode can be used for a waveforms of 16 Mpts, and for a longer waveforms (up to 128 Mpts) the play mode is necessary. I've a suspicion that the intention was to mention 16kpts, not 16Mpts.
Seeking Help with Upgrading HP8713C Vector Network Analyzer - Page 1
Forum section: electronics / testgear

author: shcweb
author_rank: Newbie
timestamp: September 29, 2023, 09:51:41 pm
content: I recently bought a used HP8713C from an online marketplace, and when I tried to upgrade it to an HP8714C using the method mentioned in this posthttps://www.eevblog.com/forum/testgear/enable-those-extra-features-on-your-hp-8714c-network-analyzer/, I ran into some weird issues.First off, when I opened up the case, I noticed that the bootrom chip inside wasn't the AM28F020 that other posts mentioned. Instead, it turned out to be an AM29F040 chip, which is supposedly used in HP871xE models. I managed to read its contents and followed the cracking steps mentioned in that post. But here's the surprising part – when I powered it back on, the machine displayed as an HP8714ES! And to make matters worse, the measurement functions are all wonky. Anything below 2.6G just shows random noise. I also tried burning someone else's HP8713C bootrom file onto an AM28F020 chip and swapping it in, but it wouldn't boot up properly. That's when I noticed a jumper cap on the board marked with E and C. When I switched it to C, the machine started up, but then it gave me a ROM verification failure message. Is there any way to successfully upgrade this device to an HP8714?
Temperature controller failed...any experience of likely repair? - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: September 29, 2023, 05:55:20 pm
content: Hi,We have a CAL 3200 PID temperarture controller...https://uk.rs-online.com/web/p/temperature-controllers/0730004?redirect-relevancy-data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 failed.Do you know if they have common failure modes?I took it apart....the isolating flyback SMPS was a cheap discrete one and its main NPN had blown up and primary coil was toast.Secondary had a '2951 5V regulator....so i shovelled a 6V PSU i had lying about into it and it got working again. (at least the Forge 39G LED letter display was lighting.)But then it failed again...i noticed the Atmel EEPROM chip on the 5V rail was very hot, and must have been taking the 5V rail down...so i removed it, and got the 5v back....but it still wont work. No LED letters.The main chip seems to be a philips P87C51R which i presume drives the display etc.Any ideas?I suspect the isolating SMPS possibly overvoltaged the sec side and overvoltage-weakened the chips there....if so i think we've had it...but do you know any other failure modes which may be fixable?