hybridfree/eevblog-posts huggingface dataset:
Re: Old LED Panel Readout\Panel Meter Identification and Pinout Help - Page 1
Forum section: electronics / testgear

author: Infrared_Fred
author_rank: Regular Contributor
timestamp: November 24, 2021, 02:47:32 pm
content: Hello!About a year ago I ordered a large box of vintage LED displays from someone on Ebay and included among assorted displays were two nearly identical circuit assemblies that appear to be some sort of panel meter. The assortment of displays included a single unused (or else previously socketed)TIL306LED display, which is a seven segment LED display + IC counter + decoder and two circuit boards that had identical looking displays to the unattached one, other than dirt and gunk on them. It is also possible that they are aTIL308/309but....whatever. The circuit boards have the digits in a +-3.5 digit format with three integrated displays and one passive +-1 overflow display. ICs visible on the front board are 2x 555 timers and a 7474 D-Flip Flop, which I am pretty sure goes with the overflow display based on TI schematics I have read. There is a second board with a bunch of ICs, but the only part numbers I can read are a LM308 precison op-amp since they are on the inner side of the circuit board. There also is a precision 10 or 25 turn potentiometer most likely for calibration. There does not appear to be any manufacturer's logo or identification, although there is a rather difficult to read 62?44A and Made in USA printed on it. Googling the 62?44A with various numbers for the unreadable one only gave real estate listings or other useless results. If they are panel meters I am much interseted in using them as is, but for that I would need a pinout or such information, since none marked on the device itself. I could take them apart but I wanted to ask here for identification help before I did that since I am a newbie and I don't want to damage them. Hopefully the pictures below are helpful--please let me know if they are readbale or if you want any differnet angles or anything like that. Thank you so much for you time and your help!Note: I am reposting to this forum since it occurred to me that this might be a more approriate place for this than general projects.Minor update: I tried a google picture search (as in using the images posted below itself and Google's AI identification) and unsuprisingly it yielded no useful results; it identifies it as a "hardware programmer" which it defenitely is not.
Marconi - IFR 2024 Repair - Error 1 Checksum Error  - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 22, 2021, 12:44:59 am
content: All:For the past couple of months, I have been scrounging around online to find parts to fix a Marconi 2024. Finally got the keypad repaired, and a screen that works. I just swapped the main control board, because it was apparent that someone had been working on it, and had damaged the board beyond reasonable repair.Upon Boot I do get ERROR 1 - CHECKSUM ERROR. I understand from the manual this is likely because I need to enter the Serial Number into memory. I have access to level I, and Level II passwords (I believe level II is "Super User"). My understanding from the Service manual is the 2024's Serial Number must be set and stored before anything else is can be accomplished. I see that the Serial Number is set to "0" under UTIL 61, which is a problem. No matter what I do in UTIL 61; I am unable to enter a serial number.Can anyone point me in the right direction here? I am looking at both the service and operations manual, and all I can see is a note that it is imperative for this serial number to be entered and stored before I can move forward with further operation or calibration of this signal generator.Rich

author: TheBay
author_rank: Unknown
timestamp: November 23, 2021, 10:15:28 am
content: It might be worth joining the Marconi Group on Groups.iohttps://groups.io/g/Marconi-Test-Instruments/

author: AJ3G
author_rank: Regular Contributor
timestamp: November 23, 2021, 01:02:21 pm
content: Hi:I just posted over there. Thanks for the referral! They have some sage knowledge about these generators that one would not know from simply reading the operator and service manual. Wish I would have found them sooner, as it would have saved some of my sanity.Apparently, the superuser password has to be written by a piece of proprietary software. Working with the group to see if we can develop a superuser password, or transplant a EEPROM (not socketed) from one control board to another to bypass this. As I understand it, sometimes the superuser password, when generated, does not work.Rich

author: TheBay
author_rank: Unknown
timestamp: November 23, 2021, 04:01:54 pm
content: Quote from: AJ3G on November 23, 2021, 01:02:21 pmI just noticed you got some replies over there, it's a good group with very helpful members and a wealth of information.

author: AJ3G
author_rank: Regular Contributor
timestamp: November 23, 2021, 04:14:35 pm
content: Yes, and I really need to check groups.io for other user-groups. Seems like there are now user groups for just about everything. I am very thankful for the groups help, at least I have a good way ahead, which I could not say as of yesterday afternoonRich
What is Going On with Tektronix Application Engineering ? - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 24, 2021, 11:53:53 pm
content: All:In the last month I have asked three times for a Tektronix application engineer to call me so I can get some questions answered on an existing product line. Each time, I am told they will call me back in 48 - 72 Hours, but I never get a call. Anyone know what is going on over there?The above is new to me, as back maybe a year ago I could call in and most times be routed directly to someone. My company may not have the budget as some of the larger defense contractors here, but we certainly spend in the six figure realm for test equipment per year, and a good hunk of it is on Tektronix.Rich

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 25, 2021, 01:56:45 am
content: Everybody put off vacation to December?

author: AJ3G
author_rank: Regular Contributor
timestamp: November 25, 2021, 02:14:49 am
content: I suppose, but this has been going on since the beginning of November.

author: commongrounder
author_rank: Frequent Contributor
timestamp: November 25, 2021, 06:11:21 pm
content: My guess is Tektronix is suffering from the same Covid era staffing shortages other businesses are. Their customer tech support service is probably spread too thin. It wasn’t as bad a year ago, when remote work was still a newish concept. Just my opinion, of course.

author: AJ3G
author_rank: Regular Contributor
timestamp: November 25, 2021, 06:18:08 pm
content: It seems something for sure has changed. When I call in, I think the phone is being routed to a call center. It sounds like they are typing my request in to be forwarded to their A/E Department. It’s clear that whoever is fielding the calls does not seem in tune with their product lines.On the last two, I did comment that I had called before, and had been told that a response would be forthcoming. Whoever is answering/fielding these calls claims because of my concern with regards to the lack of response, they were sending it to a manager, yet nothing seems to happen. I have two lousy questions, which I need clarification on.With the above being said, it seems their sales department has not dropped the ball. I called them for a quotation and I get a call back in 30 Minutes. Go Figure
HP 5314A Counter TXCO - Page 1
Forum section: electronics / testgear

author: W8RLC
author_rank: Newbie
timestamp: November 17, 2021, 03:38:03 pm
content: I am looking for information on the TCXO for the HP-5314A frequency counter. I would like to add a TXCO to my 5314A.

author: JohnPi
author_rank: Regular Contributor
timestamp: November 20, 2021, 11:48:37 pm
content: You can buy a TCXO module on eBay; there is a slot inside the counter for an edge connector -- I put mine on a small board and wired up the few connections needed (power, GND, clock ?).

author: bob91343
author_rank: Super Contributor
timestamp: November 21, 2021, 04:05:16 am
content: Why not go all the way? You can get an OCXO for very little money.

author: JohnPi
author_rank: Regular Contributor
timestamp: November 21, 2021, 11:31:18 pm
content: You are correct -- mine is an OCXO from eBay.

author: kellertxroofingpro
author_rank: Newbie
timestamp: November 23, 2021, 12:19:23 pm
content: Quote from: W8RLC on November 17, 2021, 03:38:03 pmHello Friend,PDF file is attached for the complete information about HP-5314A frequency counter. I hope this will help you out.
Anyone cracked open that "isolation" probe before? - Page 1
Forum section: electronics / testgear

author: Mecanix
author_rank: Frequent Contributor
timestamp: November 22, 2021, 02:12:50 am
content: Looking to acquire isolation to safely measure AC switching with a scope for a SMPS design I'm experimenting with and came upon this product advertised as "Isolation Probe".Are those actually optically isolated or mislabeled for a differential probe?

author: PartialDischarge
author_rank: Super Contributor
timestamp: November 22, 2021, 02:24:38 am
content: That is a diff probe

author: Mecanix
author_rank: Frequent Contributor
timestamp: November 22, 2021, 02:30:20 am
content: Right. Glad I've asked, thanks MasterTech.I take that there is nothing remotely isolated in that tool?

author: tautech
author_rank: Super Contributor
timestamp: November 22, 2021, 02:34:59 am
content: Quote from: Mecanix on November 22, 2021, 02:30:20 amIt provides isolation between the DUT and the oscilloscope.

author: Mecanix
author_rank: Frequent Contributor
timestamp: November 22, 2021, 02:57:11 am
content: Presuming few 1kv rated current limiting resistors and a comparator (or more)? Sounds smokey!I'll dig into this later on today, not familiar with those highVAC toys (thanks guys).Got a feeling I just need an inexpensive 220V-to-220V transformer, have it canned in a small metal box and call it a day...

author: tautech
author_rank: Super Contributor
timestamp: November 22, 2021, 04:49:46 am
content: Quote from: Mecanix on November 22, 2021, 02:57:11 amIt’s very unlikely a mains transformer designed for 50/60Hz operation will give suitable frequency response for SMPS operating in the 15-50KHz region.

author: BrokenYugo
author_rank: Super Contributor
timestamp: November 22, 2021, 07:09:40 pm
content: Quote from: Mecanix on November 22, 2021, 02:57:11 amDave has torn down a couple and yes that's more or less what goes into any "high voltage" differential probe, big divider (usually 4 megs each side for whatever reason) with an amplifier in the middle. I think the money is mostly in the compensation and fine tuning to give the whole thing a flat frequency response.https://youtu.be/GOlgaEK2Hsk

author: Mecanix
author_rank: Frequent Contributor
timestamp: November 23, 2021, 03:10:40 am
content: Interesting tool. Dave's vid confirmed what I've seen from another model spy shots I was looking at yesterday... just couldn't figure out the 'isolation' part. But after watching the vid and finally understanding all starts to make sense now. Regardless, spoke to a supplier (not the one of the pic, another one) and was told I needed both; the isolation transformer + diff probe kit (if done the correct/safe way is required, apparently). So I'll just gear up and cancel Friday's evening cinema and popcorn I guess.Thanks guys, all good pointers I appreciate that. Man all that tooling... adds up quick just for a custom transformer and fet switching analysis. Hope I'll have the chance the re-use all of that stuff throughout the years...
Aritsu VNA-DL 1-8800 MHz - Page 1
Forum section: electronics / testgear

author: porous
author_rank: Newbie
timestamp: November 23, 2021, 11:04:25 am
content: Hello all,I recently bought the Aritsu VNA-DL 1-8800 MHz for around 400 USD plus tax/customs from Russia and would like to share some results:- measures S11 and S21- plastic housing, doesnt get too warm, calibration seems to be quite stable over time- measured output power varies from - 20 dBm to -10 dBm. At 8800 MHz it is down to -30 dBm.- I calibrated using SOL+T method, result is nicebut if I measure short behind a short coax cable I see ripplesthat were not able to remove by adding an electrical delay- measured short behind a long cable (1m) and the ripples grow...- measured a 3 dB attenuator in S21 without adding a cable, see some ripples- Software has the basic functions but doesnt allow to zoom in more than 5 dB.My guess is that for 400 USD they use a wheatstone bridge as coupler which limits the calibration performance.But 400$ for a 8.8GHz VNA....

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 23, 2021, 01:52:20 pm
content: Cool!I've seen these marketed as "ARINST," which seemed strange, but now that I see "Aristu" and Anritsu green in the graphs, it all makes sense, lol.Is it using harmonics to get to 8800MHz or is that fundamental?Thanks for sharing

author: porous
author_rank: Newbie
timestamp: November 23, 2021, 02:11:49 pm
content: They use harmonics. The mixers are specified up to 6 GHz only.
Broken JYE Tech DSO150 - Page 1
Forum section: electronics / testgear

author: YurkshireLad
author_rank: Frequent Contributor
timestamp: November 21, 2021, 08:25:15 pm
content: I bought one those little JYE Tech DSO150s not that long ago. I know, I know. But I'm a beginner and for my basic audio needs I think it's a perfect little piece of kit. Anyway, I was using it this afternoon and it started showing really weird values. I was trying to measure a 4.5V bias input, but the DO150 was showing me -50V. I verified that the bias really was 4.5V using my multimeter. If I try to read the 9V from my power supply, it acts like it's reading a changing AC current and the duty cycle races up from 50% to 100%. It's really weird.I tried taking it apart but whoever built it, wedged it all together in the case really tightly. I didn't want to accidentally destroy it by taking it apart, it as I was frustrated, so I'll try again another day. I'll try to see if anything obvious is burnt out inside.No idea what I did to break it, but likely I did something stupid. But that's really annoying.

author: bob91343
author_rank: Super Contributor
timestamp: November 21, 2021, 11:56:08 pm
content: It doesn't look too complicated.https://jyetech.com/dso-150-shell-oscilloscope/Or read assembly instructions at the bottom here:http://www.jyetech.com/Products/LcdScope/UserManual_Shell_new.pdf

author: YurkshireLad
author_rank: Frequent Contributor
timestamp: November 22, 2021, 12:03:16 am
content: I fiddled with it again and it was working, so I don't know if it's the probe or the DSO150. It's really weird.

author: Algoma
author_rank: Frequent Contributor
timestamp: November 22, 2021, 12:34:31 am
content: I would most likely suspect the interconnect between the Front end and the processor board. If you look at the diagrams, there are plenty control signals for the front end's analog switches from the CPU. Its easy to get a bad connection through there with a bit of rough handling. Simply reseating the connection would fix it. (Or a bit of percussive maintenance)

author: YurkshireLad
author_rank: Frequent Contributor
timestamp: November 22, 2021, 12:42:43 am
content: Quote from: Algoma on November 22, 2021, 12:34:31 amAh, that's a good point.

author: Peabody
author_rank: Super Contributor
timestamp: November 22, 2021, 04:18:09 pm
content: And don't be sheepish about using a DSO150. I have one too, and have found it to be very useful for a lot of things. It's even more useful if you convert it to battery power so nothing is referenced to earth ground.By the way, they now have a 2-channel version called the Wave2. :-)

author: pcprogrammer
author_rank: Super Contributor
timestamp: November 22, 2021, 05:49:05 pm
content: Quote from: Peabody on November 22, 2021, 04:18:09 pmWhich, to my opinion is to expensive for what you get. The display flickers and the buttons feel a bit flacky. The whole construction is nnahh
Fluke 6011A manual(s)? - Page 1
Forum section: electronics / testgear

author: ivb
author_rank: Newbie
timestamp: November 22, 2021, 03:39:14 am
content: Hello everyone, I recently acquired a Fluke 6011A Synthesized Signal Generator but I lack a manual (service or user) for it. Searches here got one hit but no manual, and searches abroad have netted me nothing but ebay sellers of the original manual and CD versions. I'm hoping someone 'round these parts might have a PDF (or be willing to scan a page or two that describes the calibration pots) available. It's definitely a boat anchor with its 11 MHz top end, lack of features, and not particularly exciting -46 dB distortion (no offense to fans of this boat anchor), so this is more just for fun than any serious use.
OWON VDS1022I Trigger Out ? - Page 1
Forum section: electronics / testgear

author: JohnPi
author_rank: Regular Contributor
timestamp: November 21, 2021, 10:33:01 pm
content: I am testing some power circuits which fail under some overloads. As it fails, the damage spreads and damages other components. Therefore I want to shutdown the system as soon as the initial failure occurs -- basically when a current exceeds a threshold -- and shutdown within < 10 us by shorting the external power supply with a v. large MOSFET.I am thinking of using an OWON VDS1022I driven by a current clamp, and using the Trigger Out signal (maybe buffered with an NPN) to effect the shutdown. I don't care about the other 'scope functions, but I can't find detailed information on the Trigger Out function. Specifically:Is this a 50 Ω output ?What is the amplitude ? Is it 0 V until the trigger event and then 3-5 V ?If I set a trigger in the middle of the screen, will the Trigger Out go high as soon (< 1 us) as the trigger occurs ?how long does it stay high for ? The remainder of the trace ? So if I set it to slow (10 ms/div ?), I could get a pulse that is 10's of ms long(the lab power supply will OCP after that).

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 21, 2021, 11:24:42 pm
content: This is what the trigger output looks like. Channel 1 is connected to the 1khz signal from the oscilloscope, and channel 2 is connected to the trigger output. It seems it's delayed about 1.2µs. It does stay high for the remainder of the trace(third screenshot set at 10ms/division).

author: JohnPi
author_rank: Regular Contributor
timestamp: November 21, 2021, 11:27:43 pm
content: Thanks. It looks like about a 4 V signal which is OK for me.If you used 100 Hz, would it still be delayed ~ 1 us ?

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 21, 2021, 11:39:14 pm
content: This is at 200khz and at 100hz, seems like it's pretty constant the 1.2µs delay

author: JohnPi
author_rank: Regular Contributor
timestamp: November 21, 2021, 11:45:04 pm
content: Thank you very much for the measurements. That delay is acceptable for my use.

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: November 22, 2021, 12:01:52 am
content: Quote from: JohnPi on November 21, 2021, 11:45:04 pmhappy to help!
multimeter jittery in autorange - Page 1
Forum section: electronics / testgear

author: teus
author_rank: Contributor
timestamp: November 18, 2021, 11:48:57 am
content: What would cause a multimeter to be very jittery in autorange mode, but completely fine when you set the range yourself?I opened it, and the inside looks clean. No water damage or corrosion, no swollen electrolytic capacitors.It's an Appa 205 multimeter. Manufacturer didn't answer my request for a user manual or a service manual.

author: Kleinstein
author_rank: Super Contributor
timestamp: November 18, 2021, 02:41:47 pm
content: For testing the noise in the votlage mode, one should have the input shorted and not open. With open input there can be swtiching between ranges, that can effect the noise and for the AC range the time for settling can be quite long ( the AV mode naturally averages over the last second of so with an analog filter). So some of the shown numbers can be still effected from artifacts from range switching.

author: teus
author_rank: Contributor
timestamp: November 21, 2021, 09:05:35 pm
content: Quote from: Kleinstein on November 18, 2021, 02:41:47 pmwith the input shorted to the ground, the automatic range mode is stable.it's not about cycling through the different modes quickly, I can wait as long as I want, and the autorange function will constantly cycle through different range settings, or give a reading of 500mv.

author: Kleinstein
author_rank: Super Contributor
timestamp: November 21, 2021, 09:36:24 pm
content: The open input will pic up quite some noise and this can make the DMM switch ranges from time to time. The open circuit case is not really relevant for a real measurement. If you have a signal source with such a high impedance to be comparable to the DMM input resistance, the DMM is the wrong instrument. At the very least one still use manual ranging for these rare cases. The higher end bench DMMs usually also have a high impedance (e.g. > 1 Gohms) mode for such cases.
MICSID STO1104C Math menu - Page 1
Forum section: electronics / testgear

author: Silicium81
author_rank: Regular Contributor
timestamp: November 21, 2021, 02:23:25 pm
content: Hello,With my new MICSIG STO1104C, I have difficulty understanding the advanced functions related to mathematical calculations ...The user manual does not explain this function, I just found an example in a video seen on the micsig forum in Chinese ...I'll be happy to figure out how to use the functions circled in red below!

author: nctnico
author_rank: Super Contributor
timestamp: November 21, 2021, 03:20:02 pm
content: Bottom right corner are postfixes so you can enter 10u instead of 10e-6 or 0.00001var1 / var2 are constants you can enter somewhereLeft side are logical operators for use with conditional statements (but don't ask how to enter these)

author: Fungus
author_rank: Super Contributor
timestamp: November 21, 2021, 04:22:40 pm
content: Quote from: nctnico on November 21, 2021, 03:20:02 pmUse the two input boxes on the math menu.

author: Silicium81
author_rank: Regular Contributor
timestamp: November 21, 2021, 05:04:20 pm
content: Quote from: nctnico on November 21, 2021, 03:20:02 pmAh thank you ! It seems obvious now!
Philips PM5133S function generator, high temperature. - Page 1
Forum section: electronics / testgear

author: raftronik
author_rank: Contributor
timestamp: November 18, 2021, 04:40:14 pm
content: Hello,I just bought this device Philips PM5133S function generator, I am a bit concerned about the temperatures of several elements marked in the picture, resistors 110 degrees Celsius, transistors 60 degrees Celsius, resistors 55 degrees Celsius.The generator seems to be working properly but 110 degrees Celsius on resistors is probably way too much.Does anyone have this generator and could check the temperature of the elements marked in the picture?Thanks.

author: Tjuurko
author_rank: Regular Contributor
timestamp: November 19, 2021, 11:41:37 am
content: Is the mains voltage switch (selectable by solder links) installed correctly?Total consumption should not be more than 38 W.

author: wn1fju
author_rank: Frequent Contributor
timestamp: November 19, 2021, 02:19:05 pm
content: According to the service manual, the two resistors that you are measuring 110 degrees on are used in the power supply circuit as bypass resistors across the 78xx and 79xx regulators to reduce the power dissipation on those regulators. They are 68 ohm wirewound resistors and I would fully expect them to get real hot. The 60 and 55 degree measurements don't bother me.You probably should still do a quick check on the voltages surrounding the two regulators. Check with a voltmeter and an oscilloscope just to be sure the power supply is working correctly.And despite the high temperature, it looks from your photo as though the board hasn't even discolored underneath. I've seen cases where not only was the board discolored brown, but the board actually started to melt.

author: Neper
author_rank: Frequent Contributor
timestamp: November 19, 2021, 04:33:45 pm
content: Nothing out of the ordinary. The two resistors are mounted well above the PCB and there are holes below them for letting air through. Make sure there is an unrestricted flow of air to the instrument and you hould be fine.

author: raftronik
author_rank: Contributor
timestamp: November 21, 2021, 01:51:39 pm
content: I checked the voltages and everything seems to be ok with the diagram, I just prefer my equipment not to be too hot.

author: Neper
author_rank: Frequent Contributor
timestamp: November 21, 2021, 02:13:12 pm
content: Just stay out of the Philps FG if you can't stand the heat.

author: coromonadalix
author_rank: Super Contributor
timestamp: November 21, 2021, 02:54:20 pm
content: If it still a stress concernJust find the same value resistors with a doubled wattage / same tolerances and you can put some heatsink models on the transistors casings, be sur they dont touch themselves, unless the case is common on the pcb layout ??But if it aint broke, dont touch nothing
Recommended UK dealer for a Rohde & Schwarz RTC1002? - Page 1
Forum section: electronics / testgear

author: TheBay
author_rank: Unknown
timestamp: November 09, 2021, 09:38:39 pm
content: Treating myself to a new scope, I've settled on the RTC1002 and thinking I might as well go for the RTC1K-COM2 bundle pack.I've seen it for sale at the usual places such as RS and Farnell which I bought have trade accounts with but I think I'd rather getit from a dealer than a component parts supplier if I ever need any after sales support with it.Are there any recommended UK sellers for the R&S RTC1002 series, also are there any discounts available for R&S products, such as student discounts or any promotions etc?Importantly how are you finding your RTC1002 series? I've been impressed so far with what I've seen and I've always like Hameg scopes so quite a few functions have a lot of familiarity for me.

author: rvalente
author_rank: Frequent Contributor
timestamp: November 09, 2021, 10:36:08 pm
content: I'd go for a 4 channel scope, makes much more sense to me investing a little more and have a much useful tool.Anyway, for a 2 channel scope I'd look for the SDS2102X+ or the Micsig STO2102

author: TheBay
author_rank: Unknown
timestamp: November 09, 2021, 10:48:39 pm
content: I definitely want a RTC1002I'm not going around in circles looking at different brands and models again.I have given it much thought as I was going to buy the SDS1104X-E and decided I have no use for a 4 channel scope really.If I want to look at anything digital I'll use a logic analyser and if it's analogue I've got other scopes here.

author: TheBay
author_rank: Unknown
timestamp: November 20, 2021, 09:02:18 pm
content: Anyone know of a R&S dealer in the UK or any offer/edu discount? I still really want to get one of these
Pico Tech TA131 vs Pico Tech MI103 - Page 1
Forum section: electronics / testgear

author: Trader
author_rank: Frequent Contributor
timestamp: November 19, 2021, 03:55:54 am
content: I bought a Pico Tech TA131, but I received a "Pico Tech" MI103. Are they the "same"? Should I return it?http://www.saelig.com/product/PSA007.htm"This product has been superseded by the TA131.""250 MHz Oscilloscope probe X1/X10This passive high impedance scope probe has a 250MHz bandwidth and high frequency trimming. A two position slide switch allows attenuation of either x1 or x10 to be selected. Please note that the x10 function will not work with the ADC-10 or ADC-12 as the input impedance of these devices is not the same as a standard oscilloscope."http://www.analyticalelectronics.com/testequipment/picotech/pc_oscilloscope/passive_probes.html"MI103 : 250 MHz Oscilloscope probe x1/x10""This passive high-impedance scope probe has a 250MHz bandwidth and high frequency trimming. A two position slide switch allows attenuation of either x1 or x10 to be selected. Please note that the x10 function will not work with the ADC-10 or ADC-12 as the input impedance of these devices is not the same as a standard oscilloscope."https://www.picotech.com/library/application-note/how-to-tune-x10-oscilloscope-probeshttps://www.interworldna.com/pico/how-to-tune-x10_probe.phpThanks.

author: egonotto
author_rank: Super Contributor
timestamp: November 20, 2021, 05:25:56 am
content: Hello,I have a TA131. If you have a question, perhaps I can answer.Best regardsegonotto

author: Performa01
author_rank: Super Contributor
timestamp: November 20, 2021, 08:41:35 am
content: Quote from: Trader on November 19, 2021, 03:55:54 amI have no experience with the MI103 probe.While I have no doubt that it could perform equally well as the TA131, there is a main difference.MI103 has a separate HF-trim, which you have to get right before you can have a stellar performance from this probe.By contrast, the TA131 has only the usual LF-trim and is an excellent HF-match for the SDS1000X-E series right out of the box.To cut a long story short, you need to study the operating instructions carefully and will most likely need a good quality 1 MHz square wave with fast risetime (<3 ns) in order to adjust the HF-compensation correctly.
Which DMM for HFE, True-RMS , MAX hold with fast sampling - Page 1
Forum section: electronics / testgear

author: pfm
author_rank: Regular Contributor
timestamp: November 19, 2021, 05:57:52 pm
content: I am looking for a quality True-RMS DMM that has Hfe and Max hold featurefor AC volt and current, and has a fast sampling rate.Budget less than $100. Please suggest and recommend.Looking at a Uni-T CS618A+, AstroAI DM6000 and OWON B35T, but can't seem to figure out which would be fastest to capture short AC impulse on Max hold. AC signal of interest would be less than 15-20Khz.Any advise appreciated.Thanks!-PM.

author: Gyro
author_rank: Super Contributor
timestamp: November 19, 2021, 07:04:02 pm
content: Without trying to change your spec too much, I would be prepared to ditch the hFE function. This will limit your choice significantly and DMM hFE measurement is really basic.There are cheap tools that can do a better job of hFE measurement for you, eg.https://www.eevblog.com/forum/testgear/$20-lcr-esr-transistor-checker-project/. The LCR-T4 variant in particular is very cheap on ebay etc.

author: Fungus
author_rank: Super Contributor
timestamp: November 19, 2021, 07:05:32 pm
content: If hFE is a priority then there's only one meter for you: The Uni-T UT61E+.The Uni-T UT61E+ has a whole range dedicated to hFE and comes with an enormous adapter to let you know when you're using it.Does it do the other stuff? Possibly, but if it doesn't then you can get a different meter for that. The idea of only owning one multimeter for everything is an impossible dream.

author: pfm
author_rank: Regular Contributor
timestamp: November 19, 2021, 08:26:01 pm
content: ok lets say I take the hfe out of the requirement. Then which dmm will give me highest sampling rate for ACV/ACA Max ?
HP 8643A (probably 8644,8645,8664,8665 too) firmware dump & analysis - Page 1
Forum section: electronics / testgear

author: fenugrec
author_rank: Frequent Contributor
timestamp: November 19, 2021, 09:44:44 pm
content: Hi,it seems like these have not been publicly dumped yet ?I dumped the DCU firmware and uploaded to ko4bb as well as a git repo (link below). It contains strings for all these units so it's possible they all use the same firmware. Not sure how hardware options are configured, didn't dig that much.Here are some of my reverse engineering notes :************ initial load- CPU is a MC68HC000R8. Standard mc68k ISA- combine 4 ROM dumps (total 512k) into one file- byteswap (permut XY -> YX), seems the databus is swapped on these ? didn't check the schematics- load in disasm- reset vector points to 0010xxxx : deduce that ROM is mapped at 0010 0000.- RAM : 128k @ 0x620000- tweak ida cfg file to get vectors at 100000- reload with file mapped at the correct addr.- IDA chokes on jmptables (e.g. @ 10805A). My TDS7xx scripts don't work (slightly different cmp+mov+jmp pattern)- ghidra : jmptables look ok.- strings are pascal-style (length byte; string; \0-term ?)- neither can autoanalyze with pascal strings.In ghidra : to mark pascal string, 'T' (type), choose PascalString255 . Then 'Y' (repeat last type) as required.************ ROM checksuminitial sniffing around leads to suspicious bytes at 100400 . Following the xrefs leads to the checksum code@ 100B50 first half-chunk@ 100B6C half-chunk@ 100B90 chunketc.Simply a 16-bit unsigned sum for each chunk, stored at 100400,402,404,406 (4 chunks)Made a quick tool to compute and validate sums :https://github.com/fenugrec/hp8643aCode:$ ./hprom -f ROMs/08643-8730x_3449_byteswapped.bin**** ./hprom**** (c) 2021 fenugrecblock 0 sum16 : 4D2F [ OK ]block 1 sum16 : 016F [ OK ]block 2 sum16 : 6299 [ OK ]block 3 sum16 : FE81 [ OK ]$************* Easter eggsROM:00123942 aHelp:dc.b 'HELP IM TRAPPED INSIDE AN EEPROM',0 "ROM:001368EA ' hflp I am bejnh forcfd to vrite 68000 atS' "Hehe.
Tektronix MDO3102 Aux Input? - Page 1
Forum section: electronics / testgear

author: AJ3G
author_rank: Regular Contributor
timestamp: November 13, 2021, 09:56:31 pm
content: All:I have reviewed the manual (to include service manual), and I simply cannot find the reference to the Tektronix 3102 Aux Input. All the documentation available seems to be generically for the MDO3104. The MDO3102 has a AUX Input located where CH3 is located on the MDO3104. I am assuming this is a Trigger Input, although this is not specifically stated in the manual, that I can find. Can someone tell me if this is in fact a trigger input (which makes the most sense), and if so are the VPI Points active on this input? If the VPI Points are active, what is their purpose?I have placed a call early last week to Tektronix Applications Engineering to discuss, and I have not received a call as of yet. I found only one reference to the AUX Input in the user manual, and it really does not have much to say on the topic. If I completely missed this in the manual, kindly point me in the right the directionRich

author: egonotto
author_rank: Super Contributor
timestamp: November 14, 2021, 12:00:46 am
content: Hello,in the datasheet from MDO3000 page 19:"Trigger sensitivity....Aux In (External); available on two-channel instruments only 200 mV from DC to 50 MHz, increasing to 500 mV at 200 MHz"Best regardsegonotto

author: AJ3G
author_rank: Regular Contributor
timestamp: November 14, 2021, 09:48:19 am
content: Hi Egonotto:The specification sheet, was not where I was expecting to learn about this input. Thanks for pointing me in the right direction. Would you happen to know if the VPI connections are active, and their use for the Aux Input on the MDO3012?Rich

author: egonotto
author_rank: Super Contributor
timestamp: November 15, 2021, 03:29:31 am
content: Hello,sorry about VPI i dont know nothing. I don't have a MDO3000 family scope.Perhaps you can ask w2aew at his youtube channel. I believe he works for Tektronix.Best regardsegonotto

author: AJ3G
author_rank: Regular Contributor
timestamp: November 15, 2021, 03:41:21 am
content: Hi Egonotto:Thanks for the response you did provide. One of the last places I would have thought to look for the purpose of this input would have been the data-sheet. I think I will attempt to reach out to Alan and see what he can tell me about the VPI connections associated with this report.Rich

author: AJ3G
author_rank: Regular Contributor
timestamp: November 19, 2021, 12:15:17 pm
content: Just got done playing with the Aux Input using various TEKVPI probes. The VPI connectors do work. I recognized my 1GHz TEK 10X Passive Probe. When I connected a TEK TAP1500, it complained. It recognized the TAP1500, but complained about it.Since this was not well documented, I thought I would share. I am still trying to imagine the utility of the VPI connector here.Rich
Fluke 175 177 179 design revisions? - Page 1
Forum section: electronics / testgear

author: Jamieson
author_rank: Regular Contributor
timestamp: November 19, 2021, 02:07:44 am
content: The Fluke 175 177 and 179 family has been around for some time now. I don't recall any of these meters have a "series II" designation or whatnot. Have there been significant design revisions since they were introduced? One obvious change is the LCD backlight change on the 177/179 from edge-lit green LEDs to a more uniform white color. Are there any other subtle changes that one should look for when considering when looking for a used meter in this family?

author: Muttley Snickers
author_rank: Unknown
timestamp: November 19, 2021, 02:18:50 am
content: I really wanted to get a 174 but the cost of postage made me forget about it.https://www.eevblog.com/forum/testgear/fluke-174/
Whats the R switch on my scope probe for? - Page 1
Forum section: electronics / testgear

author: Groundwire
author_rank: Newbie
timestamp: November 18, 2021, 02:05:05 am
content: I got a few new oscilloscope probes from Probe master and on the switchable x10/1x probe there is a switch position that says R. What is the R for and how is the probe/scope used when in the R position?

author: Tom45
author_rank: Frequent Contributor
timestamp: November 18, 2021, 02:10:59 am
content: In the R position, the probe signal line is connected to ground so that you can see where 0 volts is on your scope's display. R is reference. Might make more sense to label it G for ground. But not a big deal once you know.

author: Tjuurko
author_rank: Regular Contributor
timestamp: November 18, 2021, 11:40:37 am
content: They call it "GROUNDREFERENCE".
UPDATE FIRMWARE HANTEK DSO2C15 P/ UTILIZAR A FUNÇÃO WAVE GEN - Page 1
Forum section: electronics / testgear

author: Pley
author_rank: Newbie
timestamp: November 17, 2021, 08:52:51 pm
content: Teria como atualizar o firmware do DSO2C15 para utilizar a função WAVE GEN usando o firmware do DSO2D15? Se tiver, como posso obter este firmware?Alguém poderia me enviar o link? ou enviar por email> virgispley@hotmail.com

author: tv84
author_rank: Super Contributor
timestamp: November 18, 2021, 09:31:18 am
content: Este forum é em inglês. É assim tão dificil cumprir essa regra?English!
Help chosing a multimeter for PCB work - Page 1
Forum section: electronics / testgear

author: Tim Panajott
author_rank: Newbie
timestamp: November 17, 2021, 04:00:03 pm
content: Hi!A little bit of background, I started building/testing around with LED strip and what not about 10 years ago and am now at the moment where I've started to create my own PCBs that are moderately complex and have started to update all the gear I usually use (soldering iron, heat gun and so on) and am now on the search for a new DMM as the 10 year old one is a bit of a hassle and doesn't really do what I want anymore.I've been looking a two different meters, the Fluke 17B+ and the Brymen BM527s but I am open to suggestions.The Fluke I like because, well, it's a Fluke. I like the look, the feel, the big digits and clear selection of modes. What I am missing from the Fluke is the warranty as I would be buying it used on Ebay. I would also miss the non-contact voltage detect, it's also not a True-RMS meter but I don't think that would matter to me as I almost exclusively work on by on PCBs which are DC. The BM257s on the other hand looks really nice and from what I can see it has been positively received by the market as a good and reliable meter. I like it because I can buy it new with warranty, it's a True-RMS meter, can measure capacitor size and has non-contact voltage detection. What I really don't like and that's holding me off a bit is the fact that the diode test is only 1v. I test a lot of diodes and LEDs while building PCBs and would really miss such a feature which I have on my current meter. It's also not a Fluke, which I really would like to own but hey, that doesn't really matter if it's safe and reliable.It also seems, if I'm reading the data sheets correctly, that the Fluke can measure frequency at higher voltage better, up to 100 KHz while the Brymen only does 10KHz. It also seems the Fluke can measure the Duty Cyckel and the Brymen cannot?The Fluke is not a True-RMS meter but the Brymen is, that wouldn't make such a difference for me I would think as I will only be using it on AC to check if the power is on or not before I change a light socket or similar.Anyway, I've been searching around the forum and other forums trying to make my mind up. I can't help but feeling like there's got to be a meter like the Brymen BM257s but with a higher diode test voltage that would fit almost all my needs. Thanks for any input!

author: Fungus
author_rank: Super Contributor
timestamp: November 17, 2021, 04:31:16 pm
content: Two meters is always better than one!For much less money you can get a Fluke 101 plus an Aneng 870, one has safety for testing mains, the other will measure just about anything and has 3.2V diode test voltage. Together they're unstoppable.(The Fluke 101 will also light up a white LED...)PS get some gold plated leads for the Aneng, they're only a couple of bucks.
What are these called? - Page 1
Forum section: electronics / testgear

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 15, 2021, 07:15:42 pm
content: I want to make a new controller board for an old autocal. The autocal module itself has some .030" pins sticking out of the back that fit into little receptacles with spring-loaded contacts. The lame way to achieve this would be to give the controller board big holes around the pins and connect them to the board with F-F dupont jumpers, but I'd like to use the pins-directly-into-pcb construction in the future for other projects so I'd like to try it here. Does anyone know what the little spring-loaded PCB socket receptacle things are called?Thanks!

author: Kean
author_rank: Unknown
timestamp: November 15, 2021, 07:25:51 pm
content: Maybe start herehttps://www.keyelco.com/category.cfm/Plugs-Pins-Jacks-Sockets/Micro-Pins-Jacks/p/459/id/466

author: trophosphere
author_rank: Frequent Contributor
timestamp: November 15, 2021, 07:27:50 pm
content: These go by many names but some of them includeSolder Barrel Pin Receptaclesas well asThroughboard PCB Sockets.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: November 15, 2021, 07:30:35 pm
content: Yep, those look like the ticket. Looks like the distributors even have them in stock. Thanks!https://www.keyelco.com/category.cfm/Micro-Jacks/For-022-56-034-86-Pins-Gold-Gold/p/466/id/806/c_id/1272
DS1000Z-E firmware v00.06.03.02.02 2021-10-20 Problems - SOLVED - Page 1
Forum section: electronics / testgear

author: samarkh
author_rank: Contributor
timestamp: November 10, 2021, 02:46:33 pm
content: I tried to update my DS1202Z-E to firmware version 00.06.03.02.02, following the instructions carefuly and failing every time.BUT if you Rename 'DS1000Z-EUpdate.GEL' to 'DS1000ZUpdate.GEL', i.e. remove '-E' from the file name, it works!Yours Simon M.

author: djmarkovitch
author_rank: Newbie
timestamp: November 19, 2021, 06:40:17 am
content: Thanks for the information, I was able to successfully update my scope. How did you find out about the name change?
Phyphox - free app to read and export phone sensor data - Page 1
Forum section: electronics / testgear

author: Dave3
author_rank: Regular Contributor
timestamp: November 15, 2021, 04:50:07 pm
content: https://phyphox.org/Free phone app to access sensors and export data.This was featured in the excellent dodgy healthcare equipment teardown video by "Play with Junk"."Did you know that you are carrying a 3D magnetometer? That you can use your phone as a pendulum to measure earth's local gravitational acceleration? That you can turn your phone into a sonar?phyphox gives you access to the sensors of your phone either directly or through ready-to-play experiments which analyze your data and let you export raw data along with the results for further analysis. You can even define your own experiments on phyphox.org and share them with colleagues, students and friends.Selected Features:- A selection of pre-defined experiments. Just press play to start.- Export your data to a range of widely used formats- Remote-control your experiment through a web interface from any PC on the same network as your phone. No need to install anything on those PCs - all you need is a modern web browser.- Define your own experiments by selecting sensor inputs, defining analysis steps and creating views as an interface using our web-editor (http://phyphox.org/editor). The analysis can consists of just adding two values or using advanced methods like Fourier transforms and crosscorrelation. We offer a whole toolbox of analysis functions.Sensors supported:- Accelerometer- Magnetometer- Gyroscope- Pressure- Microphone- Proximity- GPS*some sensors are not present on every phone.Export formats- CSV (Comma separated values)- TSV (Tab-separated values)- Excel(if you need other formats, please let us know)This app has been developed at the 2nd Institute of Physics A at the RWTH Aachen University."
Does anyone have the CST SP3000 Memory Tester software? - Page 1
Forum section: electronics / testgear

author: torsti76
author_rank: Newbie
timestamp: November 15, 2021, 11:40:40 am
content: Hi,I acquired a used CST SP3000 memory module tester. While the device itself works fine, using it standalone is kind of tedious.The unit came with no manual and no software. I know that there's something called "Advanced PC software". Since the CST website (and the company itself, afaik) is (partly) defunct, I am unable to obtain the software from them.Does anyone here have it?Thanks a lot in advance!Best,Torsten