hybridfree/eevblog-posts huggingface dataset:
GPIB - testing GPIB cables - Is HOST to HOST connectivity possible - Page 1
Forum section: electronics / testgear

author: ornea
author_rank: Unknown
timestamp: August 05, 2021, 01:50:13 am
content: Is it possible to set a GPIB HOST Master to become a GPIB HOST Slave and behave like an instrument.Have been experiencing issues lately with GPIB instrument connectivity and after much investigation seems like faulty cables are the culprit.Some of these cables are old and some have been used lots. Could not find any data on mating cycles. And we have many that are now suspect.Have looked at connectors under a microscope and nothing conclusive.So having been thinking of a way to do GPIB cable testing and recently considered HOST to HOST connectivity but I have been unable to connect one host to another in the Agilent Connection Expert. I can connect to INSTR like GPIB0::1::INSTR but not to HOST interface to HOST interface.Ideally I would like to set up a send/receive script (perhaps in python) between two hosts that continuously hammers the connection.Then simply test the cables by connecting the cable in question between HOSTs, run the script and flex and wiggle etc and see if the messages get mangled.Would welcome any snippets of info or suggestions on an elegant way to test GPIB cables and connectors.Cheers Ornea

author: Kleinstein
author_rank: Super Contributor
timestamp: August 05, 2021, 09:50:22 am
content: The expected type of failure would be an open connection. A short would be rare. To test the connection it would be more like testing the resistance of the connections, possibly more in series and than more the cable a little. So it would take 2 connectors with bridges to make the current go though multiple of the wires in sereis. Ideally one could test from 1 end.

author: Berni
author_rank: Super Contributor
timestamp: August 05, 2021, 10:43:46 am
content: You can just use some GPIB device for that.Find a GPIB command that the slave device can respond fairly quickly like the "ID?" and just spam the command quickly over and over, printing the results to a console. Then just look at the console output while giving the cable the rough handling.Weird random glitches could also be caused by your cables being too long, or too many devices on it. The timings for GPIB are not all that strictly defined so various devices can talk at varying speeds, so it could be your problematic device is running the bus particularly fast.

author: ornea
author_rank: Unknown
timestamp: August 05, 2021, 10:53:03 am
content: Have decided to sacrifice once cable so can do the snake thing. That is:- probes on pin1 1 and 24 and cross connect the other pins.Then do a standard resistance test and maybe send a tone in and monitor while wiggling connectors etc.Yes, this has worked for years but over time became more un-reliable and was proving difficult to pinpoint and all the gear is old and potential suspects.Changing a cable helped but whenever there are issues the cables are now suspect and there are many, So we just need a way to test them.Thanks for the suggestions
Voltech PM3000 basket case due to leaking Lithium battery. - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: June 30, 2021, 10:04:44 am
content: Came to me from a customer for repair. No hope at all to repair this unit! The corrosion appears to have eaten through the PCB and the bottom sheet metal! Even the front panel is affected. This is the absolute worst case of Lithium battery leakage I've ever seen.Got to love the name of the battery Crompton Eternal.If you have one, it would be a very good idea to do some preventative maintenance ASAP.

author: theHWcave
author_rank: Regular Contributor
timestamp: June 30, 2021, 12:43:33 pm
content: Wow! truly revolting. Do you have any idea how long that battery was left in that unit (may it rest in pieces) ?

author: helius
author_rank: Super Contributor
timestamp: June 30, 2021, 01:25:37 pm
content: Lithium thionyl chloride cells cause serious corrosion because the electrolyte acts as a chloride ion donor (similar to hydrochloric acid). It is also toxic.Mean time to destruction is about 20 years, although it can be worse in humid environments. One brand (Tadiran) has very few failures: they use a more robust construction.Surprisingly, many devices damaged by these exploding cells have been recovered. The outer layer traces may be completely eaten but inner layer damage is less common.

author: Tantratron
author_rank: Frequent Contributor
timestamp: June 30, 2021, 02:43:44 pm
content: Do you know the presence of similar battery inside a Voltech PM100 ?

author: Jwalling
author_rank: Unknown
timestamp: July 01, 2021, 07:47:29 am
content: Quote from: theHWcave on June 30, 2021, 12:43:33 pmIt is quite horrifying. When I first opened the unit and the battery fell out onto my bench, I jumped a bit as I didn't know what the hell it was!I don't have any idea how old it is, but suspect it was the original battery from when it shipped. I see a date code of 9036 on one of the chips.

author: Jwalling
author_rank: Unknown
timestamp: July 01, 2021, 07:48:28 am
content: Quote from: Tantratron on June 30, 2021, 02:43:44 pmI don't. But I'd check if I had one!

author: theHWcave
author_rank: Regular Contributor
timestamp: July 01, 2021, 10:10:47 pm
content: Yes I totally understand that. In the first picture you posted that "thing" looked almost organic, like a caterpillar or some other weird creepy crawly. I would have jumped too. 30 years is a long time, probably the last 10 years in storage with no external power, so completely draining the battery. No wonder it looks like that.

author: Tantratron
author_rank: Frequent Contributor
timestamp: August 04, 2021, 12:47:04 pm
content: Quote from: Jwalling on July 01, 2021, 07:48:28 amJust opened my PM100 to check visually, please see attached picture of its PCB one face. No trace of any battery neither on its bottom which I've checked visually.Albert

author: Per Hansson
author_rank: Unknown
timestamp: August 04, 2021, 06:57:31 pm
content: Put that on eBay in "unknown condition"Heck, I'd give it a try to fix it if you're anyway going to chuck it
Tektronix Prism 3001GPX LA info needed - Page 1
Forum section: electronics / testgear

author: MagicSmokeGuy
author_rank: Contributor
timestamp: August 02, 2021, 05:28:04 pm
content: Picked up one of these logic analysers cheaply but it doesn't have the user manual and I've drawn a blank finding one online.Anybody have any pointers to where I might find one? I've already tired the Tektronix site but they cannot help.Also any help or guidance on known issues, fixes etc. most welcome.

author: gslick
author_rank: Frequent Contributor
timestamp: August 02, 2021, 09:58:51 pm
content: Is this what you need?https://archive.org/details/tektronix_gpx3001https://archive.org/download/tektronix_gpx3001https://archive.org/download/tektronix_gpx3001/doc/https://archive.org/download/tektronix_gpx3001/doc/user_manual-prism_3001-system-070-6672-04.pdfTektronix User Manual PRISM 3001 System 070-6672-04

author: MagicSmokeGuy
author_rank: Contributor
timestamp: August 04, 2021, 02:26:52 pm
content: Perfect!Thanks you so much - just what I was looking for.Brian
Question about Agilent 89641s vxi based vsa/sa - Page 1
Forum section: electronics / testgear

author: acAlina
author_rank: Newbie
timestamp: August 04, 2021, 03:09:46 pm
content: Hello everyone!I could get the aforementioned vector signal analyzer for pretty cheap considering its specs, but i cannot find much information about it, especially the software. Its manual says it is compatible with the 89600 vsa software, but it is not supported by the current version of this software. I found a link on this forum to a older version, the 89601a v12. I’ve only read about people using that software with their (hacked?) e4406A’s, so i’d like to know if this is indeed the software i need to control the vxi based system.Also, how is the licensing on the older versions? Do i have pay absurd amounts to use a +10 year old software? I’ll probably use it mostly as a spectrum analyzer so i don’t need any fancy functionality. So can i atleast use the SA software for free? And how about calibration, can it be done diy?If anyone has experience with this system i’d really appreciate your opinions/info about it. Allthough the thing is cheap (~300) i’m not brave enough to buy it just to find out i have no way of using it😁(I’m new to this forum so sorry if this is the wrong board or if this topic has been covered before.)Thanks!-Alina
Telstra Contact Fault Locator - How do they work (to test GPIB cables/connector) - Page 1
Forum section: electronics / testgear

author: ornea
author_rank: Unknown
timestamp: August 06, 2021, 09:32:05 pm
content: When I was a boy ... we used these contact fault locators in Telstra (aka Telecom Aust) to determine if a coax connector was faulty. Each and every connector was tested by connecting to the Contact Fault Locator and tapping the connectors with a nylon hammer. It was very good at finding suspect connectors.Any suggestions on how such a device would work? Theory of operation?This is a follow on from a previous post about testing GPIB cables. We made a jig where each conductor is snaked to the other. However, all my tests seem to indicate that the cables are very good. The tests include:-1. Passing a range of currents thru the snaked cable in series with a 8-ohm speaker and tapping, wiggling and re-mating the connectors. (The mating's are audible but once mated are silent)2. Passing a current thru the snaked cable and using a cro to scope the volt drop across the snaked cable then tapping, wiggling and re-mating the connectorsAll these tests indicate that the GPIB cables and connectors are rock solid. And they may well be but I am suspicious.So how to detect the smallest of current variations and amplify. Any suggestions. I think Mr Carlson's Lab has a design but maybe available to Patrons only.Thanks for readingOrnea
HP 3577A which softkey runs confidence tests? - Page 1
Forum section: electronics / testgear

author: DrNefario
author_rank: Contributor
timestamp: July 31, 2021, 07:43:45 pm
content: I am trying to run the confidence test on my 3577A without a display readout via GPIB. I can get plots just fine and have swept a filter, but am trying to follow the manual to run confidence tests. It says "Press the SPCL FCTN key , then the CONF TEST soft key", but I don't know which one that is. Can somebody please tell me which key that is starting from the top as #1 ?Note : There are 8 soft keys total.Here is the filter sweep just FYI:

author: wn1fju
author_rank: Frequent Contributor
timestamp: August 01, 2021, 12:52:53 pm
content: Key #3.Look at the Operations Manual. A lot of the menu trees are shown there (e.g., page 4-30).

author: DrNefario
author_rank: Contributor
timestamp: August 02, 2021, 12:49:16 pm
content: Thanks, I had an older copy of the operations manual with about half the number of pages which did not include the soft key screen "Special Functions" pictures. I found a later copy which did have the pictures and will try that as soon as I am able.
ZYT GPSDO turn off background light - Page 1
Forum section: electronics / testgear

author: cmu2017
author_rank: Contributor
timestamp: August 02, 2021, 05:03:13 pm
content: I would like to turn off the background light of the ZYT GPSDO after x minutes. But I can't find the setting anywhere to do this. And mine stays with Freq: N/A and also with Freq Diff: N/A. Can I set this somewhere so that I actually get to see the frequency here?
U1242C beeping and showing current error mode - Page 1
Forum section: electronics / testgear

author: backes
author_rank: Newbie
timestamp: August 01, 2021, 02:46:54 pm
content: Hello,Suddenly the Keysight U1242C multimeter beeps for 5s, the Vsense light stays on and it shows the muAEr error. According to the handbook this means that test leads are connected into the A or mu*mA terminal but a wrong mode is selected. Indeed, when I turn the dial to current measure then the error disappears. The issue however is that no leads are connected... No matter where I connect leads I get this error.Any guesses how I can troubleshoot and fix this issue?ThanksQuick start handbook:https://www.keysight.com/ch/de/assets/9018-04174/quick-start-guides/9018-04174.pdfpage 11 shows the error that I have

author: Tjuurko
author_rank: Regular Contributor
timestamp: August 02, 2021, 03:53:55 am
content: I don't have such a device.Judging by the pictures from the Internet, the problem may be due to an additional circuit for determining the connected probe.

author: J-R
author_rank: Super Contributor
timestamp: August 02, 2021, 04:05:50 am
content: I'm not sure what detection method is used for the U1242C, but two possibilities that come to mind would be a split jack or an optical sensor. So clean the jack first and see if that makes a difference.

author: mqsaharan
author_rank: Regular Contributor
timestamp: August 02, 2021, 11:00:40 am
content: I would also suggest you to carefully clean both the current sockets first. There might be something conductive in them. If that doesn't solve the problem then there might be something wrong with the sense circuitry.From the picture, I guess the springy wires clipped on top of the current jacks are the sense wires.
PACE soldering station calibration modules - Page 1
Forum section: electronics / testgear

author: ce_lab
author_rank: Newbie
timestamp: May 06, 2018, 07:42:26 pm
content: I am hoping someone might know the values for the C1 and C2 calibration resistors used to calibrate temperature on the PACE MBT 250 stations and others. From online pictures, C1 is 100 ohms type RN60E but not sure about C2. These connect between P3-P6 when prompted by the calibration routine. Anyone have them and will to share the values?p/n 6993-0133-P1

author: Chris56000
author_rank: Frequent Contributor
timestamp: May 06, 2018, 11:05:05 pm
content: Hi!There's a clue in the MBT Service Manual!https://www.paceworldwide.com/sites/default/files/MBT%20250%20Service%20Manual_0.pdfPins J1-4 is annotated "CH1 RTD" and Pin J1-5 annotated "RTD Return" - the fact that it's known that one of the calibration Modules is a 100.0R resistor indicates the lower cal. set point for the microprocessor is "0.0C", and also identifies the "C-1" and "C-2" calibration resistors as connecting between "RTD" and "RTD RTN" per channel, so with this info to hand, plough thro' the service manual, and make a note of the max. temperature the unit is designed to work to, which is 482.0C., so by reference to an RTD PT100 Comparison chart:-http://electrolyseur.fr/ZIP/Pt100.pdf. . .we read "482C" as about 274.8R, which you can make up with 1 x 240R, 1 x 33R and 1 x 1R8, all in series - you should be able to get these in 1% E24 series!The C-1 and C-2 calibration plugs are simple 6-pin DIN connectors - RS, Mouser or Digi-key should have something that matches the plugs on one of your Pace Handpieces you can use to make them from!Obviously if there's anyone got a pukka C-2 then this is what you need, but it you get really stuck and the value I suggest for calibration at 482C doesn't work or the Pace micro doesn't accept it (recognised by an error indication or the unit "hanging" at the "C-2" stage, then try again, but this time, try using a "C-2" value of 400.0C or 500.0C from the PT100 chart in turn until the micro accepts the figure and completes the cal!Hope this helps until someone can read off a pukka OEM "C-2" plug for us!Chris Williams

author: ce_lab
author_rank: Newbie
timestamp: May 07, 2018, 12:38:00 am
content: Hi Chris. Yes, Pt100 and with RN60E (these look like Dale) they would likely use a standard decade value. I could narrow it down with a trimmer and see what passes... but still hoping someone might have one laying around. Thanks!

author: Greg
author_rank: Newbie
timestamp: December 16, 2020, 03:58:20 pm
content: We can use another way to confirm the temp, connect the heater, and also connect a stand RES, it is should be displayed stand team same as the PT100 table.If the temp can match the table, Just ignore the CAL

author: Bruce, KG6OJI
author_rank: Contributor
timestamp: July 31, 2021, 06:50:37 pm
content: Has anyone been able to inspect and measure the C-2 board?Regards,Bruce Hunter
Tektronix 6809E Microprocessor Support Package - Page 1
Forum section: electronics / testgear

author: bitwise
author_rank: Newbie
timestamp: August 01, 2021, 07:53:50 am
content: I'm looking for the manual that goes with the "TLA Support for Motorola 6809E Processor" software from the Tektronix websitehttps://www.tek.com/software/tla-support-for-motorola-6809e-processor. Or if anyone knows the pin mapping to hook up a 6809E that would also be helpful. Most of the probe channel names make sense, but I have no idea where I should connect the probe channels labeled: "DEAD_D~", "VMA_D~", "IOCO_D~", "IF-IF2_D~", "IF_D~", and "6809E/6809~". Thanks.
advice on choosing cheap waveform generator with special function - Page 1
Forum section: electronics / testgear

author: arivel
author_rank: Regular Contributor
timestamp: July 29, 2021, 12:07:37 pm
content: Hello.advise me please?.I need an inexpensive waveform generator capable of supplying a train of intermittently pulsed sine waves at its output or in other words a train of sine waves at regular time intervals

author: tautech
author_rank: Super Contributor
timestamp: July 29, 2021, 08:35:35 pm
content: Quote from: arivel on July 29, 2021, 12:07:37 pmFor those I'm aware of you would require 2 channels to set one to burst with the waveform you require and the other channel to provide the internal triggering for it at the time interval needed.SDG1032X can do this if not in DDS mode then certainly with a script in ARB mode.

author: tunk
author_rank: Super Contributor
timestamp: July 29, 2021, 08:41:45 pm
content: Can't give you any advice, but it may help if you say what your budget is and what frequencies.

author: TurboTom
author_rank: Super Contributor
timestamp: July 30, 2021, 05:23:57 am
content: So you are looking for something like this?That's possible with virtually any waveform generator that supports Pulse mode (N Cycle) or, though maybe not as accurately phase-wise, amplitude modulation with a square wave.It's up to you to define "inexpensive" or "cheap"... The screenshot shown has been generated with a hacked Rigol DG811, which I'ld currently consider the best option from a value-for-money point of view, but any entry level AWG, be it Siglent or Rigol, will do. I'm not familiar with the UNI-T and the Feeltech or similar "Tinkerer's Delight" boxes, but it's well possible that they will suit your needs at two-digit price tags as well. So I recommend to search the forum for the related threads and get yourself an opinion of the available models.

author: arivel
author_rank: Regular Contributor
timestamp: July 30, 2021, 06:26:42 pm
content: Quote from: TurboTom on July 30, 2021, 05:23:57 amYes, right . this is what I want to achieve.can it be done with FeelTech FY6900?

author: MarkF
author_rank: Super Contributor
timestamp: August 01, 2021, 03:42:52 pm
content: Maybe theUNI-T UTG932 Function Generator Arbitrary Waveform 30 MHz Dual-Channelfor $139 USD.I'll let you do the research to find out if will generate the waveform.
InfiniiVision 2000 X-Series triggers - Page 1
Forum section: electronics / testgear

author: chilippso
author_rank: Newbie
timestamp: July 31, 2021, 07:37:10 pm
content: Hello together,I want to trigger a single shot on either rising edge after 85ms of the previous (first) rising edge or 1ms after the previous pulse width trigger to debug a SWD signal (if you are curious,see this thread for background).I have an Agilent/KeySight InfiniiVision MSO-X 2004A oscilloscope.According to the manual, there are a number of trigger types: edge, edge then edge, pulse width, pattern, OR, rise/fall time, Nth edge burst, runt, setup & hold, video, and USB.However, my oscilloscope only shows four: edge, pulse width, pattern and video.It would be great if someone could tell me where to find the other triggers. I have already upgraded the firmware to the latest version (02.65.2021030741).Kind regards

author: nfmax
author_rank: Super Contributor
timestamp: July 31, 2021, 07:47:45 pm
content: If you have an older 2000 series scope, supplied before the additional features were added in March 2018, you need the DSOX2PLUS upgrade package:https://www.keysight.com/gb/en/product/DSOX2PLUS/infiniivision-2000-x-series-enhancement-package.html

author: chilippso
author_rank: Newbie
timestamp: July 31, 2021, 07:54:48 pm
content: Quote from: nfmax on July 31, 2021, 07:47:45 pmThank you for the information. What a joke. "Here is the xyz you just bought" - "What? You also want to use it? That's another xyz $" ...

author: nfmax
author_rank: Super Contributor
timestamp: July 31, 2021, 08:02:52 pm
content: A joke? Not really. This update added capabilities the scope did not offer at all previously, regardless of which options were enabled, including four times faster waveform update rate, extra math functions, and additional triggers. You would have had to buy a 3000 series scope to get these features before 2018. The upgrade price seemed reasonable to me, so I bought it.

author: 2N3055
author_rank: Super Contributor
timestamp: July 31, 2021, 08:25:59 pm
content: Quote from: nfmax on July 31, 2021, 08:02:52 pmI agree with you..That's, what, 250 USD to actually make 2000 series worth the damn..If I had 2000 series I would gladly give that to at least have basic trigger options cheap Rigols and Siglents have..Even Rigol DS1054Z has more advanced triggers that basic 2000.To OP.If you just bought new one than you should have received that upgrade for free. If it is an older one, than I do suggest to consider buying it, if you can afford it. It will considerably upgrade scope you have, most notable 10 times the memory (Keysight have smallest memories in class, and even an upgraded 1MPoints is not much but is still huge improvement), segmented memory (again very useful to capture many different events) much higher trigger refresh rate so you actually have some benefit of that famous Keysight chipset.. Off course, you can go the other way and "liberate it". But honestly for that price, I would buy it to keep resale value..Or you can sell that scope and buy some of the newer generations of scopes that are much more advanced, for that money...
Help ! Briked Riden RD6012 - Page 1
Forum section: electronics / testgear

author: luudee
author_rank: Frequent Contributor
timestamp: July 30, 2021, 11:22:21 am
content: Hi Guys and Gals !I was doing a firmware update on my RD6012, but it failed in the middleof the update. Now I just get a black screen on the PSU.I am using the USB connector on the front panel.Is there a way to recover and reinstall the firmware?Thanks!rudi

author: luudee
author_rank: Frequent Contributor
timestamp: July 30, 2021, 03:57:35 pm
content: I found a solution!Holding down the "ENTER" key while powering it up, will enter the bootloader. That allows the PCto connect to it again and update the firmware. This time successfully !!!rudi

author: cemelec
author_rank: Contributor
timestamp: July 30, 2021, 04:10:22 pm
content: I have a 6006 and a 6012, so that's good to know, thanks!
Why does my oscillascope channel fluctuate - Page 1
Forum section: electronics / testgear

author: suspension
author_rank: Regular Contributor
timestamp: July 27, 2021, 10:03:34 am
content: I have a Rigol 4 channel analog oscilloscope. Channel 1 does not show a stable wave when connected to the test signal. Please see below for a video. What could be causing this?

author: Grandchuck
author_rank: Super Contributor
timestamp: July 27, 2021, 11:04:32 am
content: Could it be hum pickup? Did you try switching probes?

author: StillTrying
author_rank: Super Contributor
timestamp: July 27, 2021, 11:05:11 am
content: The first thing to do is to carefully swap the probe at the BNCs to see if CH1 becomes OK, and the wobble moves to another channel. It looks like it could be the probe to me.Terrible pic. we can't see much.

author: suspension
author_rank: Regular Contributor
timestamp: July 27, 2021, 12:17:25 pm
content: I have done the probe swapping already and it did not change anything. Could this be due to a damage in analog input circuits related to this channel? I used this channel to test the output of a 230V inverter but not sure if this issue came after that.Sorry about the picture, I actually used a GIF which shows the fluctuation, but apparently it has been converted to a still image I think.

author: Grandchuck
author_rank: Super Contributor
timestamp: July 27, 2021, 01:30:36 pm
content: Quote from: suspension on July 27, 2021, 12:17:25 pmThat would point to a damaged input.

author: StillTrying
author_rank: Super Contributor
timestamp: July 27, 2021, 01:56:22 pm
content: Yes, not looking good, if it was a bad connection on the CH1 BNC I think you'd have found it by now.What's CH1 plus another one for comparison like both with nothing on the BNCs.You could try using AC LINE as the trigger source to see if the wobble is mains frequency related, but I don't know how it would be.

author: Grandchuck
author_rank: Super Contributor
timestamp: July 27, 2021, 06:03:45 pm
content: What is the resistance from channel 1 ground to the other grounds (from BNC shell to BNC shell)?

author: suspension
author_rank: Regular Contributor
timestamp: July 28, 2021, 11:18:22 am
content: Thanks all for the ideas.I dont know what happened, but the issue went away automatically. I hope it will not come back
Siglent "Modulation Analiser" module - Information / Help please - Page 1
Forum section: electronics / testgear

author: alannz
author_rank: Contributor
timestamp: July 28, 2021, 01:59:17 am
content: Hey all,'I'm looking for some information and are struggling a little. I have a SVA1015 with the modulation Analysis module enabled (both analogue and digital).When I look at a signal from a radio (FM) and put the SVA into modulation analysis Mode selecting FM I get the FM Modulation screen.Some of the information on the FM modulation screen I am struggling to understand.For Example: SINAD, There is a line item that lists a SINAD reading, the issue there is no documentation on how to use this? From my understanding SINAD requires a RF input with a modulated tone to the DUT and then an audio out for the analyzer to read. The RF input is then varied in power to the DUT and analyzer measures the SINAD based on the audio out reading. (Thats how I understand SINAD works).My question is that the Siglent seems measure SINAD but no information on how to use it or how to connect the radio to the SVA?Why would SINAD be listed in the screen if the SVA cannot actually make the measurement?Any ideas??? (See attached photo)
Power supply Matrix MPS 3005H review. - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: July 24, 2021, 02:16:58 am
content: Hi everyone, I bought a new power supply from amazon, the brand is Matrix MPS 3005H.Specifications.-Two regulated power supply of 30V-5A, maximum 31V-5.1A-Single fixed power supply of 5V-3A.-Parallel, series and independent modes supported.Highlights.-Encoder type knobs, this feature is incredible because lock the value, you need push and turn knob for change value for current or voltage.-OVP and OCP settings, this part I like it, because in OCP mode is very useful for me, fix a current value if limit is overpased, output turn off.-Output botton independent for each power supply except fixed power supply.-Start with programed modes, you can select if you want the power supply turn on with outputs on or off, turn off beep, or fix limits for voltage and current.-Toroidal type tranformer.-Low noise.-Comes with three 4 mm plug alligator cables and printed user manual.I think this power supply it has good quality for price range, I paid around 200 USD for it.Only bad thing with this power supply is the fan noise, fan is activated automatically by temperature.I hope your comments.

author: rauldm
author_rank: Regular Contributor
timestamp: July 24, 2021, 02:19:29 am
content: Noise with 110 Watt

author: Analog4
author_rank: Contributor
timestamp: July 25, 2021, 07:06:06 am
content: You might check out alternative fans.My MATRIX TECHNOLOGY MPS-6005D+, Variable Linear Regulated Adjustable DC Power Supply had a noisy fan. I replaced it a different fan, which seems to work fine and is much quieter:GDSTIME 80mm Fan, 80mm x 80mm x 15mm 24V DC Brushless Cooling Fan Sleeve Bearing, Part # GDT8015S24V2P2.54FSNoise Level 31 dB, Rated Speed: 3000RPM; Air flow: 35.6 CFMCheck your power supply to see if there are alternative fans that might work. I think a noisy of the fan was not a design priority for the Matrix manufacturer.

author: rauldm
author_rank: Regular Contributor
timestamp: July 26, 2021, 10:28:23 pm
content: Hi, Thanks for your answer, I will try put other fan, really is noisy, what do you think about your matrix PS?Regards.
Testing MOSFET RDS or Resistance between Drain and Source - Page 1
Forum section: electronics / testgear

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: July 24, 2021, 02:05:25 pm
content: Hello Electromates,I am needing to test a batch of Mosfets that just arrived.I'm wanting to test the Resistance between Drain and Source.Below is the DataSheet for one of the MOSFETS in question.For RDS(on) it lists the following......VGS=10v, ID=10A with a typical reading being .22 ohms and a Max ohms being 0.27 ohms.The DataSheet does not include a schematic for testing RDS(on), only the parameters.So, making sure I understand this, it means apply 10v between the Gate and Source Pins, with current at the Drain being 10Amps ?This circuit is correct for this test?DataSheet

author: bdunham7
author_rank: Super Contributor
timestamp: July 24, 2021, 02:19:11 pm
content: Yes, that's the general idea, but the test is typically a short pulse (you can pulse VGswith an AWG) because the DUT will be dissipating up to 27 watts.

author: David Hess
author_rank: Super Contributor
timestamp: July 24, 2021, 04:20:12 pm
content: In your case the only reason to apply 10 amps to the drain is to make a more sensitive measurement. A lower current will be sufficient.

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: July 24, 2021, 04:42:00 pm
content: Quote from: David Hess on July 24, 2021, 04:20:12 pmThe only thing is......That is the specified current for the RDS test. Wouldn't they have published a lower current if applicable?

author: bdunham7
author_rank: Super Contributor
timestamp: July 25, 2021, 12:16:28 am
content: Quote from: ThermallyFrigid on July 24, 2021, 04:42:00 pmThe reason they use the term RDS(on)is that it should be relatively constant over a range, within reason. Yes, they have specified at at 10A, but as I said, you wouldn't have very long to take your reading at that level. You should get a similar reading at 1A, for example, but with 100X less heat generated. But if you can, try it both ways and report back on the differences.

author: ThermallyFrigid
author_rank: Frequent Contributor
timestamp: July 25, 2021, 01:51:00 am
content: Quote from: bdunham7 on July 25, 2021, 12:16:28 amWill do.I am wondering......would a circuit for testing one N channel MOSFET work for most other N channel MOSFETS ?

author: graybeard
author_rank: Frequent Contributor
timestamp: July 26, 2021, 05:02:29 pm
content: Quote from: ThermallyFrigid on July 25, 2021, 01:51:00 amYes, so long as they are MOSFETS are big enough to not be overstressed by your test.For the resistances you are measuring you should make Kelvin connections to the MOSFET; the voltage sense leads should be separate from your current force leads.
LWLA1034 Logic Analyzer software - Anyone have a copy?  - Page 1
Forum section: electronics / testgear

author: Lindsey
author_rank: Newbie
timestamp: November 29, 2019, 10:55:52 pm
content: I'm looking for a copy of the software for this old, cheap, logic analyzer. Does anyone have a copy lying around?

author: jemotrain
author_rank: Contributor
timestamp: December 08, 2019, 04:58:54 pm
content: Hello,I also have such a box. The software which came with the unit was not very stable so i use the "sigrok"-Package which supports the LWLA1034 and many others.You can find it under:https://sigrok.org/wiki/Main_PageMaybe its a solution for your problem.

author: zenxyzzy
author_rank: Newbie
timestamp: March 18, 2021, 11:16:36 pm
content: I, too have a LWLA1034 and can't find the CDROM that came with it. supposedly, the newest software works well.I have the sigrok and pulseview, and it seems to be more limited than the original software. anybody have a copy or a download link?--curt

author: turquazman
author_rank: Newbie
timestamp: July 26, 2021, 03:59:03 pm
content: hello I have a 16 channel noname logic analyzer and also have software sent by provider(seller) in cd.I will be glad to share it with youhere is the google drive link:https://drive.google.com/file/d/17d9SAcdQcFuLRwOkLgaL6swlSouHLjrd/view?usp=sharing
Tektronix P6015 repairs - Page 1
Forum section: electronics / testgear

author: H713
author_rank: Regular Contributor
timestamp: July 26, 2021, 04:43:52 am
content: I recently rescued a P6015 from the E-waste bin at a hamfest. The catch, of course, is that it needs a little work.The original cable seems to have deteriorated and someone installed a BNC connector in its place. I did get a chance to talk to the person who had done this "repair", and they said that they were able to get it to calibrate against a normal 200 MHz 10x probe so long as the RG58 cable between the probe and the probe compensation box was less than 30 inches long and as long as there was a 10" piece of RG58 between the compensation box and the oscilloscope. I did test this, and with a 10 V peak square wave from an HP 3325, it does seem to give the same results.An HV probe with a 3 foot cable isn't the most useful thing though, so I'd like to come up with a better solution. For my purposes (personal projects), "pretty close" is probably good enough. I have some pieces of the original coax which was used. It appears to be a low capacitance coax with a resistive center conductor, which isn't all that surprising.FWIW, I know this is an HV probe, and I am more than aware of the potential hazards in using / modifying high voltage equipment.Does anyone know where I can get similar coax?

author: Mark
author_rank: Frequent Contributor
timestamp: July 26, 2021, 08:49:42 am
content: The tektronix part number for the 10ft cable is 175-0264-00 and is listed as 50 ohm (but as you found, it has a resistive conductor).I found a cable here:https://www.buyacaciasw.com/index.php?main_page=product_info&products_id=405982but I have no idea if the site is genuine or not.There is an instruction manual for the P6015 here:https://w140.com/tekwiki/images/3/35/070-0373-01.pdf

author: tggzzz
author_rank: Super Contributor
timestamp: July 26, 2021, 09:47:08 am
content: Quote from: H713 on July 26, 2021, 04:43:52 amDo you mean you replaced the BNC connector on the probe? That would make me jittery.As Mark noted, "high" impedance scope probe leads are not normal coax but are lossy, so the reflections in the improperly terminated (1Mohm) transmission line don't cause problems.

author: H713
author_rank: Regular Contributor
timestamp: July 26, 2021, 02:03:01 pm
content: No, the probe body hasn't been touched- this is on the compensation box.
Janky Hakko FX951! - Page 1
Forum section: electronics / testgear

author: Wmacky
author_rank: Regular Contributor
timestamp: July 24, 2021, 03:21:58 pm
content: Whats up with this new FX951 I just got. It will not enter sleep mode no matter what I do!!Did I get a turd?

author: KG7AMV
author_rank: Frequent Contributor
timestamp: July 24, 2021, 05:16:44 pm
content: Real or Fake?

author: Old Printer
author_rank: Frequent Contributor
timestamp: July 25, 2021, 01:22:25 am
content: There is an FX951 on Bangood for $94 from China, got to be counterfeit/knock off. Is it one from a source like that?

author: DaJMasta
author_rank: Super Contributor
timestamp: July 25, 2021, 02:57:31 pm
content: It enters sleep mode when the pencil is placed back in the holder, so it's worth checking that. Make sure you have the holder cable connected, and if you already do, you can probably remove the end that goes into the base unit and do a continuity check on it to verify the switch is actually working. You can also check the manual for setting sleep functionality, and make sure your temperature is above 300C, as it states it will not sleep if below 300C.
Digitech QM1548 fried - Page 1
Forum section: electronics / testgear

author: henryinsydney
author_rank: Contributor
timestamp: July 28, 2021, 07:23:11 am
content: A colleague damaged his DMM by putting the new 9V block battery the wrong way. These DMM's don't have a clip, which would make it obvious, but two springs as for AA's. So the input cap blew, I replaced that, but it's still dead in the water. Does anyone have the schematics for it or know whether reverse polarity kills the uC for good?A bit poor though that a $50 Jaycar meter has no polarity protection and not a proper 9V clip!?

author: henryinsydney
author_rank: Contributor
timestamp: July 28, 2021, 07:24:46 am
content: Maybe this post should go under "repair"?
SDG-1032X triggered sine rise / fall time - Page 1
Forum section: electronics / testgear

author: 1k2
author_rank: Newbie
timestamp: July 24, 2021, 07:07:25 pm
content: Hi all,I'm working with the SDG-1032X and would like to know if the following is possible with this or any other generator. I've read the manual and searched this forum, but could not find it.When I on/off trigger a basic 10 MHz sine wave, the rise and fall times are very fast. Would it be possible to configure a rise and fall time of about 4 ms?Example envelope:4 ms rise to full amplitude, 20 ms sustain amplitude, 4 ms fall to zero amplitude.Like this image I found, altough this is probably a raised cosine waveform:Thanks,Ben

author: Caliaxy
author_rank: Frequent Contributor
timestamp: July 24, 2021, 08:05:14 pm
content: I believe SDG-1032X allows you to modulate one channel with the output of the other one. So you could create a trapezoid waveform of your choice on one channel and use it to modulate in amplitude a 10MHz sine wave on the other channel.

author: 1k2
author_rank: Newbie
timestamp: July 25, 2021, 09:05:16 am
content: You're right! I'm using that function to create an FSKCW signal. So I'm probably not going to get those two modulation types combined, but for CW it will work. Have to make a new arb wave with the slopes in it, and then choose DSB-AM mod as I don't want the carrier.The channel 1 output was at 0 dBm, or 632 mVpp.AM:DSB-AM suppressed carrier:Thanks,Ben
recommendation on scope, is there a recent list on gear ? - Page 1
Forum section: electronics / testgear

author: Oy1r
author_rank: Contributor
timestamp: July 20, 2021, 12:01:02 am
content: My fluke pm3380 gave up the ghost, anode high voltage failed, i tried to get a new board but the result was not very good. So i'm looking for a new one.What is the latest EEVblog recommendation on entry/hobby scopes ?Preferably something i can get in Europe.oy1r

author: tautech
author_rank: Super Contributor
timestamp: July 20, 2021, 12:11:41 am
content: Very dependent on needs and budget.BW ?2 or 4 channels ?MSO ?Additional features required ?Traditional UI or with touch display ?And so on......

author: Fungus
author_rank: Super Contributor
timestamp: July 20, 2021, 07:17:25 am
content: Budget?Number of channels?Quote from: Oy1r on July 20, 2021, 12:01:02 amThese forums are literally overflowing with this discussion. Try reading a few threads.

author: Oy1r
author_rank: Contributor
timestamp: July 20, 2021, 10:39:40 am
content: 3 channels should be enough i guess. i remember the Rigol 1052 or 54 being mentioned on eev youtube, i was thinking maybe something newer but similar. i could spend around 5 to 800 us$ on a new toy !Reg

author: tautech
author_rank: Super Contributor
timestamp: July 20, 2021, 10:47:52 am
content: RegSDS1104X-E for $499 is well thought of here and the bit cheaper $399 SDS1104X-U might fit your needs too.Happy hunting.Rob

author: tggzzz
author_rank: Super Contributor
timestamp: July 20, 2021, 11:02:27 am
content: Quote from: Oy1r on July 20, 2021, 12:01:02 amThere are many tedious repetitive threads here. Feel free to browse them.You should always start by defining what you willand won'tuse it for.Next understand the class of probe you need to use, and budget for that.Finally, leave money for all the other things you will need.

author: tv84
author_rank: Super Contributor
timestamp: July 20, 2021, 11:32:55 am
content: This oneis really fresh! Do your part.

author: Oy1r
author_rank: Contributor
timestamp: July 20, 2021, 07:44:04 pm
content: Thanks i appreciate the input. having had a scope and then loosing it is a pita. even though one is just an amateur electronics geek!

author: Oy1r
author_rank: Contributor
timestamp: July 23, 2021, 01:47:03 am
content: I started with a 2ch 100MHz scope. So that was the bare minimum i wanted, i ended up ordering the Siglent SDS1202X-E and and probes.Looking forward to getting it.Reg

author: Oy1r
author_rank: Contributor
timestamp: July 23, 2021, 01:59:09 am
content: Oh and while i was at it. i ordered an arbitrary wave generator 2ch 30MHz.!

author: tautech
author_rank: Super Contributor
timestamp: July 23, 2021, 02:00:16 am
content: Both popular models for us in NZ and they will serve you well.Congrats and enjoy.

author: Oy1r
author_rank: Contributor
timestamp: July 23, 2021, 06:43:16 pm
content: Encouraging thanks.The choice is huge, i didnt konw what exactly to get, so after a few hours i just decided on these two, i could sit a few more hours and still not make a choice !The signal gen is Siglent SDG1032X.a second multimeter could be handy. perhaps a bench model.73Reg, OY1R
HP 3478a display 'sidelight' DIY - Page 1
Forum section: electronics / testgear

author: wkb
author_rank: Super Contributor
timestamp: July 22, 2021, 06:22:03 pm
content: Today I spent some time hacking a 'sidelight' for the display of my HP3478a. Call it a sidelight because it illuminates the display from the top and bottom side. The LCD itself I have not touched at all, the whole thing is completely reversible. The light spreader/diffuser consists of 2mm white acrylic, which I laser cut to size. There is not really a lot of space for the light spreader, which results in slight hot spots at the LED locations. I plan to replace the 7810 I installed to feed the LEDs by an 7808, this will make the hot spots less obtrusive.Anyway, the pictures speak for themselves.Wilko

author: wkb
author_rank: Super Contributor
timestamp: July 22, 2021, 06:23:15 pm
content: more pics

author: wkb
author_rank: Super Contributor
timestamp: July 22, 2021, 06:24:37 pm
content: And yet more pics.Note that to the human eye the display is much more evenly lit than to the camera.
Agilent 54831M Hack to 1GHz - Page 1
Forum section: electronics / testgear

author: bostonman
author_rank: Super Contributor
timestamp: July 25, 2021, 01:54:40 pm
content: I was reading this thread:https://www.eevblog.com/forum/testgear/54831b-upgrade-to-54832b-possible/I attempted to reply, but I got a message stating the thread was over 120 days old and suggested starting a new topic.Per the thread, I saw the oscilloscope "now identifies itself as 1GHz BW", however, I didn't see where to find this. I'm considering removing the resistor on mine.From what I can tell from the thread, when the scope identifies itself as a 54832, that indicates it's a 1GHz BW due to the model number change, is this correct?Mine is a 54831M (although, in the 'about' menu, it shows as 54831B), so I assume after I remove the resistor, it will show as 54832B or M?

author: tautech
author_rank: Super Contributor
timestamp: July 25, 2021, 02:37:38 pm
content: Quote from: bostonman on July 25, 2021, 01:54:40 pmTake no notice if what you intend to post is highly relevant to an older thread.In some ways for those finding these similar threads in years to come it can be a good idea to drop links into threads so to some effect tie them together.Good luck with your hack.

author: bostonman
author_rank: Super Contributor
timestamp: July 27, 2021, 02:40:23 am
content: Good call, I'll post my initial message on the actual thread.
Gossen Metrahit 29S - External 5v adapter - Page 1
Forum section: electronics / testgear

author: ironambrose
author_rank: Newbie
timestamp: July 22, 2021, 06:18:50 am
content: Hi all,First time post - I have recently just got my hands on a Gossen Metrahit 29s. After briefly chatting with my Dad that I was on the lookout for a decent multimeter he mentioned he had recently picked one up from a second hand shop (or opp shop here in australia). He told me he got it for $10 and thought it was pretty decent based on how it looked. After looking it up I was pleasantly surprised it was an extremely capable meter so very excited about it.Having said that I have found that it seems like the 5v adapter is a proprietary device BUT... just wondering whether anyone has managed to hack one up using similar types of adapters / using a diy approach? I am keen for a power supply on this but not willing to spend $140USD for an official one as it feels like highway robbery. Adapter shown below for reference.If no ideas around this I will stick with AA batteriesCheers

author: 2N3055
author_rank: Super Contributor
timestamp: July 22, 2021, 06:37:46 am
content: From datasheet:............As opposed to common plug-in power packs, the NA5/600 includes a regulated output with minimal residual ripple and coupling capacitance to the mains input, as well as a highly insulated power cable. Measurement accuracy influences are thus minimized, and there is no impairment of electrical safety........While it's not worth $140USD , it isnotjust a common power brick. I don't have it, but maybe someone who does can take a closer look. I guess some medical grade devices should be OK. They have better isolation and less leakage..

author: coromonadalix
author_rank: Super Contributor
timestamp: July 22, 2021, 05:11:43 pm
content: For a mere 10$ if it's true you have one of the best meter on the planet, kinda slowish a littleon the display but exceptionalit is supposed to be a very long barel jack, normal adapters will not fitI know its high priced but dont play and take the chance to do some damage ... you dont realise how high priced theses meter are ... and mostly their aceesories ...
RLN4460 Connected to R8000C making Static Noise - Page 1
Forum section: electronics / testgear

author: Pmm5000
author_rank: Newbie
timestamp: July 19, 2021, 09:10:56 pm
content: Hi to anyone who reads this.I have a Motorola RLN4460 connected to a FREEDOM Communication Technologies R8000C. Whenever I turn on the R8000C, the connected RLN4460 starts making a static noise. It only started roughly a couple weeks ago after it was returned by another user. Although, I might not have noticed it before.I'm simply wanting to know if the static noise is normal. And if it isn't, how would I go about fixing it? Mostly because it's starting to bother my ears.The static noise does change in frequency and starts and stops when I'm autotuning APX radios which is what it is used for. Which is why I think it's supposed to happen, but at the same time, I'd rather it didn't like it didn't for the past few months before it was lent out.

author: Pmm5000
author_rank: Newbie
timestamp: July 20, 2021, 06:22:26 pm
content: Turns out the static noise is normal. Just it was the R8000C making the noise, since the volume level was just barely turned up.I disconnected the RLN4460 from the setup and still had the noise. I took it a few meters away and checked and verified that the noise most definitely wasn't coming from it like I originally thought. To clarify I held it up to my ear while next to the R8000C and the noise got louder, which is why I made this mistake to begin with.Anyways, problem was solved by turning the volume knob on the R8000C to 0. No more noise.