hybridfree/eevblog-posts huggingface dataset:
Motorola R2600 Communications System Analyzer VCO/PLL issue - Page 1
Forum section: electronics / testgear

author: andreiu21
author_rank: Newbie
timestamp: August 13, 2020, 09:53:58 pm
content: Hi all,I've recently got an Motorola R2600B communications test set and few days ago I've started to encounter the next issue:- I set the frequency on the generator to 27.175Mhz and copy it to the monitor as well.- The test rig is connected to my Yaesu FT817 on the same 27.175Mhz- First everything seems fine, the generator works as well as the receiver part in the test rig- After I modify the frequency (does the same if i modify by the rotary encoder, the keypad or even if i recall another preset) the generator and the monitor does not work anymore on the new frequency or even on the old one.- After modifying around the frequency by repeated times sometimes it comes back to reality, sometimes not.I've observed that when behaving like this, setting the Freq to around 26.775~26.875Mhz seems to generate in reality on 27.175I made a short video as well to present the issue:Operator manual and the RLN-4120 Service Manual can be found below.https://drive.google.com/drive/u/0/folders/1Ysk_Npxb-zn6pcOIoKtBQ8gk4WbCx4RpI've cleaned, and checked already almost all connectors, and took out and inspected all the modules but issue still the same. Checked the 10Mhz reference oscillator and also tried by using the external 10Mhz reference input but the behavior is still coming up.I suspect something in the VFO/PLL section to misbehave but I have no idea how to continue the investigation.Any idea is welcomed to help me solve this.Thanks!

author: xxx2fan
author_rank: Contributor
timestamp: September 29, 2020, 12:37:12 am
content: you might want to go over to Batboard forums under Test Equipment lots of info on service monitors there with folks to help you.Join read and post there.

author: andreiu21
author_rank: Newbie
timestamp: October 04, 2020, 05:56:30 pm
content: I finally managed to fix it (at least for the moment).I've took apart the analyzer and cleaned all the golden fingers of the PCBAs with the blue side of an eraser.before this, I've tried cleaning with cotton swabs and IPA but the issue kept appearing and disappearing from on moment to another.Now after the "eraser method" looks to be fine. I've been playing with the analyzer for about two weeks now and the fault seems to be gone.Thanks all!
Korad 6005D Power Supplies in Series - Page 1
Forum section: electronics / testgear

author: connectTek
author_rank: Regular Contributor
timestamp: October 03, 2020, 02:26:47 am
content: Just wondering if it's safe to connect 2 x Korad 6005D power supplies in series, safely?Cheers.

author: radiolistener
author_rank: Super Contributor
timestamp: October 03, 2020, 03:15:38 am
content: Quote from: connectTek on October 03, 2020, 02:26:47 amIf you connect they in series, you will get 60+60=120 V.This is definitely is NOT SAFE! Such voltage is very DANGEROUS!Even 60 V is not safe.I suggest you to treat any voltage above 30 V as dangerous.And at some conditions even 20 V may be dangerous.

author: connectTek
author_rank: Regular Contributor
timestamp: October 03, 2020, 08:48:11 pm
content: Just want to play with +15_0_-15vdc .Is it ok with the korads?

author: ceoxrad
author_rank: Regular Contributor
timestamp: October 03, 2020, 09:02:48 pm
content: Yes, it will be fine, I use two different power supplies in series to get split rail power everyday

author: connectTek
author_rank: Regular Contributor
timestamp: October 03, 2020, 10:38:28 pm
content: Thankyou

author: tautech
author_rank: Super Contributor
timestamp: October 04, 2020, 01:31:09 am
content: Quote from: radiolistener on October 03, 2020, 03:15:38 amYes well some users still require a HV DC current source dangerous or not.To series 2 supplies of the same make is not uncommon and clues to max voltages for doing so are in the datasheets listed as their max elevated voltage WRT mains ground.This same question came up recently about multi channel PSU's in series mode being placed in series for even higher voltages.Here, 120 VDC @ 6A is possible:
Problems with Bitscope Micro/Bitscope logic analyzer software - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: August 31, 2019, 08:01:07 pm
content: Hi,I´d bought a used Bitscope Micro just for fun and today, I want to play around with.So I installed Bitscope DSO and Bitscope Logic on my dell notebook.While it seems that bitscope dso works, the bitscope logic freezed/crashed after start.So I installed it on my pc, same problem.On both, notebook and pc, the OS is windows10 home.Maybe this is the problem, did anyone had it too and knows the solution ?-Martin-

author: Seedychris
author_rank: Contributor
timestamp: October 03, 2020, 10:54:13 am
content: Hi MartinOnly just saw your post about this. I also purchased a Bitscope micro to play around with a couple of years ago and have experienced similar issues on both Win 7 and Raspberry OSMy intention was to make a portable 20MHz scope for about $400 (AU) Which I achieved using a Hammond case, a Pi 3B+, 7" Touchscreen, BS Micro and an 8000mAH USB battery.It all works mostly and is about the form factor of a THS-720 TekScope but the touch control in the bitscope software leaves a lot to be desired. I have tried the Arm version 2.8 and 2.9 software and it works until you turn on the cursors (a vital function in my opinion) and as soon as you touch the screen there is a fatal exception and the app closes. This happens in both the DSO and LA softwareThere has been no updates on the Bitscope website for several years now and v2.9 is still considered a Beta development release. I don't know if they have abandoned the product or not but in its current form its a major disappointment. It does work a little better on a Win desktop machine so I'm going to give the board and probes to my son to use until he can afford a decent bench scope. Will re-purpose the rest of the hardware for something else.So, I don't have a solution to your original question except to explore a different acquisition device. Plenty of choice these days.ChrisD
Option of 8 bit unsigned as well as 7 bit signed vertical resolution? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: October 03, 2020, 10:43:29 am
content: As far as I understand, scopes with an 8 bit A/D have 7 bits of resolution above the line and 7 bits below. If you’re looking at a waveform with alternating polarity, that’s fine. What about when you are looking at a waveform that is only positive going, for example. You only have 7 bit resolution. Do any scopes have the option of using the full 8 bits in this situation, with the expectation that there can be no display below the line? Maybe unsigned is the wrong word. Single polarity only, maybe.

author: TurboTom
author_rank: Super Contributor
timestamp: October 03, 2020, 10:54:50 am
content: That's what the vertical position adjustment is meant for. Actually, the 8 bits (of which anyway < 7 bits are valid -- check the typical ADC datasheets...) are (typically) what you see on the screen (there may be a slight extension beyond the screen borders of maybe 10 or 20%). The offset is generated by injecting a DC voltage into the scope's analog front end, so if you offset the trace right to the bottom line of the graticule, all the available resolution is in the positive input range and vice versa.

author: Circlotron
author_rank: Super Contributor
timestamp: October 03, 2020, 12:15:01 pm
content: Good. Thank you.
PACE thermojet and thermopik right temperature - Page 1
Forum section: electronics / testgear

author: gkmaia
author_rank: Frequent Contributor
timestamp: October 06, 2020, 08:05:01 am
content: What is the temperature/pressure you guys set your thermojet for soldering SMD with solder paste?Also, do you attempt to use the thermojet to remove SMD ICs? What temperature, tip and pressure is the best?
small opentype variac 3 or 5 amp - Page 1
Forum section: electronics / testgear

author: robsims
author_rank: Frequent Contributor
timestamp: October 01, 2020, 11:51:41 pm
content: Searched on the net for a cheap small opentype 3 or 5 amp variac in the USA., but could not find any. If anyone comes across one please let me know. I want to build it in a box with a transformer

author: wd5jfr
author_rank: Regular Contributor
timestamp: October 02, 2020, 12:05:24 am
content: Lots on eBay.

author: tkamiya
author_rank: Super Contributor
timestamp: October 02, 2020, 01:28:57 am
content: Here's a link for brand new ones:https://www.digikey.com/en/products/filter/equipment-variable-transformers/619?s=N4IgjCBcoCwdIDGUBmBDANgZwKYBoQB7KAbRDjDAE4A2EAXQIAcAXKEAZRYCcBLAOwDmIAL4FqADipRQySOmz4ipEAAYGzNpE48BwkWJAAmFQDc0fNMkYg6CXgBN2AWjCqIm9iAIsAnkxx2NCxkAyAAs someone said, plenty on eBay, too.

author: bob91343
author_rank: Super Contributor
timestamp: October 02, 2020, 02:27:01 am
content: Trouble is, a 3 or 5 A variac isn't small or cheap. They weigh several pounds and the cost isn't trivial. The smallest variac with which I am familiar is rated around 1 Ampere but that's not a very useful rating. Superior type 10B comes to mind.

author: coppercone2
author_rank: Super Contributor
timestamp: October 02, 2020, 02:59:38 am
content: they have fractional amp variacs that are used in panel mount control systems

author: robsims
author_rank: Frequent Contributor
timestamp: October 02, 2020, 11:30:51 am
content: Quote from: tkamiya on October 02, 2020, 01:28:57 amI going to order one at digikey. Many thanks
Repair Fluke PM3384A Resets every 2-3 minutes after a 15 minute warm up? - Page 1
Forum section: electronics / testgear

author: mcconkeyb
author_rank: Contributor
timestamp: October 01, 2020, 12:48:20 am
content: My old PM3384A that I got used 15 years ago, has started a new behavior that is very annoying. After a 15 minute warm up, the scope does a power on reset, and then about every 2 -3 minutes after that, it does it again, and again, and again...I'm looking for advice here. Is it worth troubleshooting this, or am I going to have to chase the rabbit down the hole only to find that it is not fixable? Or; is this a known problem with a known fix?

author: coromonadalix
author_rank: Super Contributor
timestamp: October 01, 2020, 01:25:11 am
content: I would check all psu voltages, leaked capacitorsA tread herehttps://www.eevblog.com/forum/repair/flukephilips-pm3384a-combiscope-digital-trace-faults/--------------------------------------------Theses links should provide an service manualhttps://www.opweb.de/english/company/Fluke_and_Philips/PM3382click on the "pdf" file download optionhttps://archive.org/details/philips_Fluke_PM3370APM3380APM3382APM3384APM3390APM3392APM_3394Areference manualhttps://archive.org/details/FLUKE_PM3382A-PM3384A_PM3392A-PM3394A_Reference

author: mcconkeyb
author_rank: Contributor
timestamp: October 03, 2020, 10:41:16 am
content: Yup, checking for leaky caps is on the to-do list. But there are a LOT of electrolytics in this thing, could be weeks of work and then what do I do if that is not the problem...I'm going to assume that the voltages are (at least starting) OK, as it works for the first 15 minutes.I don't have a thermal camera to track down any overheating issues... I could use my finger for a burn test, but I don't have enough experience with this piece of gear to know what is too hot, so I'll likely just end up with burnt fingers and no solutions.My biggest concern is having a bad ROM, with defective operating code. If this is the problem, then I have no possibility of fixing this unit...Any thoughts on this welcomed!PS. What is the best choice for a new low price scope? Is Siglent still the best bang for the buck?
Testing/Validating Rigol DL3021 - Page 1
Forum section: electronics / testgear

author: bitman
author_rank: Unknown
timestamp: October 01, 2020, 03:13:54 pm
content: I'm a hobbiest electronics fan who spend my electronics time creating circuits and assemblies to support IoT type devices. In other words, rather small, low voltage etc. Part of my learning path has had me build a few power supplies to understand how they work, and for that reason I first built my own DC Load and now I'm the (proud?) owner of a DL3021 which offered better battery testing and higher load limits - definitely a bit of an overshoot for me. Anyway, it's here but "something is off".I don't seem to get the right results from it. Or perhaps I'm doing things wrong. At this point just connecting it straight to my Rigol 832 PSU at 12V and setting the load at 3Amps I see a voltage drop close to 0.5v (starts at 0.4v and gets wider and wider every minute). When I use my multi-meter where the two connects, it confirms the voltage drop but only at 0.4v. I use 14AWG wire on the DC load terminals, and AWG16 on the PSU. Both stranded - in other words, nothing special about them - just plain old electrical wire. When I use the calculations based on these AWG I should only expect less than 50mV drops so "something is wrong".Reading Rigol's "how to test your equipment" guide takes me to an area I have no equipment for. So I wonder how I can do a good test and perhaps do a basic calibration so I get the expected results? Should I start by getting the right wires? It seems I should only expect mV differences with my bad wires so it doesn't seem the right place to begin. So how do you test when you don't have 40-60A 150V DC supplies?
Can't get Fluke 8845a to connect with FlukeView, any suggestions? - Page 1
Forum section: electronics / testgear

author: aronake
author_rank: Frequent Contributor
timestamp: September 29, 2020, 01:22:24 pm
content: Hi,I have a fluke 8845a and try to get it to connect with FlkueView, but no sucess.The serial to RS232 cable I use is not fluke genuine, but I manage to connect with terminal program and control the meter.I set the meter to FLUKE 45 communication, and both meter and computer to 9600 baud, no parity, no flow control, and 1 stop bit on computer.Any suggestion what else to try?

author: HKJ
author_rank: Super Contributor
timestamp: September 29, 2020, 03:33:20 pm
content: What about trying TestController:https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/It supports 8846A on network, I would expect it easy to make a definition for 8845A based on that. For serial connection you will have to add " com" to the #port specification.

author: aronake
author_rank: Frequent Contributor
timestamp: September 30, 2020, 12:24:50 pm
content: Thanks!Think I found the problem. When I send *IDN? to my fluke 8845A, it responds "NETGEAR"!? So now using TestController and hacked the 8846A definition to search for NETGEAR, rather then FLUKE 8845A.And is TestController much more covers my need, no need to get Flukeview Forms working.

author: HKJ
author_rank: Super Contributor
timestamp: September 30, 2020, 12:52:40 pm
content: Quote from: aronake on September 30, 2020, 12:24:50 pmI will recommend you name you definition "Fluke 8845A" and place it in ...\Documents\TestController\Devicesthen you will not get any problems upgrading TestController (I do make upgrades frequently).
TDS 2022 faulty after fell on the floor - Page 1
Forum section: electronics / testgear

author: rvalente
author_rank: Frequent Contributor
timestamp: September 29, 2020, 09:42:10 pm
content: Hello Mates,so I've came across this TDS 2022 with a modest price, $70, owner says it came this way after fell on the floor.I've thought to repair and sell it/keep it, is it worth? The display runs for about $50, so $120 + risk and my labor.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 30, 2020, 01:10:28 am
content: anything could be broken, board cracked, damaged lcd, case parts .... i would personally not take that chance

author: tkamiya
author_rank: Super Contributor
timestamp: October 01, 2020, 12:50:42 am
content: I would open the case up and re-seat everything. In case of LCD panel, I would take it a part and make sure zebra strip (please look this up) on straight and in place.I think it's worth trying to repair it. I would. You may not even need new parts.If you are going to calculate your own time as labor, then decision is business. I'd just take it as personal project, learn and enjoy.

author: Brumby
author_rank: Unknown
timestamp: October 01, 2020, 02:30:30 am
content: Quote from: tkamiya on October 01, 2020, 12:50:42 amAlways a good first step when things have been shaken up - and while you're in there, have a look to see if anything seems like it has shifted or on an angle you wouldn't expect to see in things coming off a production line.QuoteLooking at the display, I would support this suggestion. I might also double-check any multi-pin connections leading up to the display.Quote from: tkamiya on October 01, 2020, 12:50:42 amYeah ... your call on this. Also, if repair is a failure, would you be financially stressed at the original expenditure? If not and you felt like having a go, write it off as an educational expense.

author: rvalente
author_rank: Frequent Contributor
timestamp: October 01, 2020, 02:43:32 am
content: I was about to get the scope but the seller decided to sell it for some locally, damn it. I've never liked these TBS/TDS/THS with only 2.5K points (why tek, why) but for a beater would be great.I may find something similar in the future...Anyway, tks mates!

author: Brumby
author_rank: Unknown
timestamp: October 01, 2020, 03:03:49 am
content: That's annoying - but par for the course.Better luck next time.

author: james_s
author_rank: Super Contributor
timestamp: October 01, 2020, 04:51:15 am
content: I'd say $70 would have been a steal for one of those. They're not nearly as nice as the TDS3000 series but they're still popular scopes.For what it's worth, the displays in these are standard VGA resolution with a digital RGB + dotclock interface, it's pretty easy to confirm that you're getting a valid video signal. If the panel is the same as used in the TDS3000 it's an off the shelf industrial TFT panel. Probably irrelevant though, I'd bet the signal connector popped loose.
Just bought Siglent SDS2352X-E - Page 1
Forum section: electronics / testgear

author: lawrence11
author_rank: Frequent Contributor
timestamp: September 30, 2020, 06:23:57 pm
content: Sup TautechSo I also got the MSO options...I mean, why would I buy anything else? Are you REALLY gonna give me more for my money than this deal right here?I hope you guys continue to better implement the EXT trigger, the MSO, and the Decode into a better streamlined product.Via future firmware updates.Thx very much.

author: Martin72
author_rank: Super Contributor
timestamp: September 30, 2020, 08:19:04 pm
content: Hi,Maybe you can tell us the whole story....

author: lawrence11
author_rank: Frequent Contributor
timestamp: September 30, 2020, 10:18:15 pm
content: just ordered yesterday.did not try it yet... there is no "story".

author: tautech
author_rank: Super Contributor
timestamp: September 30, 2020, 10:36:02 pm
content: Quote from: lawrence11 on September 30, 2020, 10:18:15 pmIMO these are good value for BW.Got your PM and yes a SDS2354X-E would be a killer but not sure if 2x the acquisition heat could be successfully managed.

author: lawrence11
author_rank: Frequent Contributor
timestamp: September 30, 2020, 11:22:02 pm
content: well thats good, nothing to regret.
R&S HMExplorer problem. No screen shot. - Page 1
Forum section: electronics / testgear

author: SNGLinks
author_rank: Regular Contributor
timestamp: September 24, 2020, 08:24:17 pm
content: I'm using an R&S HMS3010 spectrum analyser with their software, HMExplorer, on my Win10 PC.It used to work but when I tried it today I couldn't get it to show a screenshot. I could see my saved screenshots.It's connecting to the SA as I can save and load the SA's settings.I then updated the HMExplorer software to the lastest version. Now I cannot even see my saved screenshots! They are still in the default folder on the PC.I wonder if it's a problem caused by the latest Win10 update?

author: SNGLinks
author_rank: Regular Contributor
timestamp: September 30, 2020, 10:58:54 am
content: I tried updating the firmware of the analyzer but the R&S site does not recognise the HMS3010, not even under discontinued products!The hameg.com address just gets redirected to the R&S site.

author: rf-messkopf
author_rank: Regular Contributor
timestamp: September 30, 2020, 07:32:42 pm
content: Quote from: SNGLinks on September 30, 2020, 10:58:54 amI'm not familiar with that analyzer or the HMExplorer software. But as far as I know the HMS3010 series has been renamed HMS-X at some point, see here:https://www.rohde-schwarz.com/product/hms-productstartpage_63493-42689.html. I don't know if the firmware is compatible with the older HMS3010 model, I only looked briefly at the release notes, which say nothing about compatible models. Perhaps ask R&S if there is any doubt.
Details on a Phillips PM2411. - Page 1
Forum section: electronics / testgear

author: rcrook
author_rank: Contributor
timestamp: September 30, 2020, 10:25:21 am
content: I was given this Philips PM2411 and I love it.But I am after some advice on it.I have opened it up and it looks good inside though the battery terminals are green and will need some love. Vinegar wash and some IPA ok for that?ALso I am after the Manual Circuit diagram and if possible a calibration procedure?Lastly, it came with zero leads. Where is the best place I can go for leads? (The are not the normal 4 mm style, the are smaller 2 mm?).And help will be appreciated.

author: george.b
author_rank: Frequent Contributor
timestamp: September 30, 2020, 12:36:08 pm
content: White vinegar and IPA should do it. As for the manual with schematics, ElektroTanya has it:https://elektrotanya.com/philips_pm_2410_2411.pdf/download.html

author: rcrook
author_rank: Contributor
timestamp: September 30, 2020, 01:38:44 pm
content: Thanks very much..Randall.
Tek TDS340A firmware update - Page 1
Forum section: electronics / testgear

author: ndp
author_rank: Newbie
timestamp: September 30, 2020, 09:39:50 am
content: I have my trusty Tek TDS340A that I use for the occasional project. Pulled it out tonight and realized it's on version FV:v1.09 dated Nov. 19 1996... yeah, almost 24 years old.I understand they went up to v2.x. Is there any way to do a firmware upgrade? Is it even worth it? Or am I just stuck living in the 90s?I might just sell the thing and get something more modern but for now it's what I got.Let me know, and thanks.Nick

author: coromonadalix
author_rank: Super Contributor
timestamp: September 30, 2020, 10:37:45 am
content: a small pictures wikihttp://w140.com/tekwiki/wiki/TDS340But if it's aint broke, dont do anything. the newest FW could be for other pcb revisions, if there is ? Maybe there is a FW log at TEK ?EDIT: saw thishttp://www.toughdev.com/content/2014/01/exploring-tektronix-tds-340-100mhz-digital-storage-oscilloscope/Service manual infos etc ... maybe youll need to find the card options

author: uski
author_rank: Frequent Contributor
timestamp: September 30, 2020, 10:40:07 am
content: I agree that if it is not broken, don't try to mod it..Also, think twice before spending your hard earned money for a "fancier" scope, especially for occasional use...The firmware on these units is stored in ROM, so you can't update it easily.If you dump the ROM you can make someone happy :https://www.eevblog.com/forum/testgear/tds300-hack-tds340a360-and-tds320350-firmware-images-needed/If you find someone with a more recent version you could try to flash it into a blank ROM and see if it works
Loto OSCxxx series protocol - Page 1
Forum section: electronics / testgear

author: mmm22
author_rank: Regular Contributor
timestamp: September 30, 2020, 08:28:50 am
content: Is there an SDK or any other possibility to communicate with Loto OSCxxx series oscilloscopes? The only reference I found was a few commands for OSC802https://sigrok.org/wiki/Loto_OSCxxx_series#Protocol
HoldPeak HP-770D issue - Page 1
Forum section: electronics / testgear

author: valera
author_rank: Newbie
timestamp: September 29, 2020, 01:30:00 pm
content: Hi everybody!I got this guy back in 2017 for 44$, and it had been working pretty well until the last week.Now it seems that its analog part freezes after a few seconds. I made a short video of that:1. If I let it rest for a while and then turn it on, then for a few seconds, it works normally, shows voltage and other values ​​correctly.2. Then, the readings freeze and stop changing, even if I remove the probes or connect something else (s.a. the video above).3. If I then switch the mode, it shows exactly 00000, and readings do not change anymore.4. If I turn it off / on right after, it shows exactly 00000, and readings do not change.5. But if I keep it turned off for an hour, then it works, but only a few seconds (see item 1).I would appreciate any advice on that.lygte's review for this DMM:https://lygte-info.dk/review/DMMHoldPeak%20HP-770D%20UK.htmlSince I wasn't able to find the circuit here I'll attach PCB photos from lygte article (back side if flipped for convenience).

author: valera
author_rank: Newbie
timestamp: September 29, 2020, 01:52:10 pm
content: This DMM has two chips inside: HY3131 as analog front-end and HY11P14 as main controller.I suppose the issue somewhere between HY3131 and it's analog parts. I think main controller works well as high-level functions like hold and min/max seems to be working.Here is what I've already checked and tried:1. Voltage regulator IC4 (7530) correctly outputs 3.0V (+1.5 and -1.5 at C13).2. Voltage reference IC5 (LM185-1.2) looks like it was badly soldered, but on the backside it was soldered okay. Anyway, it correctly outputs 1.235 REF0 to the IC2 pins 4 and 7. I also resolder it just to make sure.3. DMM's current load is 1.5..1.6mA and there's no visible difference between working and freezing.4. It's not a HOLD button issue. The button seems to work well.This is how I decided to power on the device while debugging (with main rotary swtich removed):Correct position of rotary contacts (just for future reference):
Source for high quality silicone coated wire for custom leads? - Page 1
Forum section: electronics / testgear

author: dan46n2
author_rank: Contributor
timestamp: September 29, 2020, 12:19:28 am
content: I did a search and found some old sources for silicone coated wire to make leads and such from China but nothing recent. Does anyone have a good source for this stuff? Preferably good quality copper/silicone and not very expensive

author: ebclr
author_rank: Super Contributor
timestamp: September 29, 2020, 01:16:03 am
content: It's acceptablehttps://www.aliexpress.com/wholesale?catId=0&initiative_id=SB_20200928171537&SearchText=silicone+wire

author: bdunham7
author_rank: Super Contributor
timestamp: September 29, 2020, 01:20:03 am
content: https://www.tequipment.net/search/?F_Keyword=pomona%206733

author: wizard69
author_rank: Super Contributor
timestamp: September 29, 2020, 07:00:13 pm
content: All you really need to do is to get on your favorite vendor's web site and do a search:https://www.digikey.com/products/en/cables-wires/single-conductor-cables-hook-up-wire/474?k=silicone%20test%20lead%20wire.In this case I got six different supplier to digikey. Your computer is the greatest repairmans tool ever made.
Question about pace mbt250 motor spec - Page 1
Forum section: electronics / testgear

author: gkmaia
author_rank: Frequent Contributor
timestamp: September 29, 2020, 06:52:21 am
content: My motor is gone.As far as I could tell it should be a RS555-SH.But as usual, from the web I got a few different specifications for this model. From RPMs ranging from 2500 up to 6000. Different current specs...One thing that would be helpful if anyone with experience would know the max A at 12v the PACE could handle. I will then try to get something at 4500RPM that under that current.
Amphenol 31-320 RG58 BNC's and RG-400 Cable - Page 1
Forum section: electronics / testgear

author: Smoky
author_rank: Frequent Contributor
timestamp: September 28, 2020, 08:02:59 pm
content: I bought 25 feet of RG-400 cable and a used Amp Pro Crimper II with a .068/.213/.255 die.Can the Amphenol 31-320 RG58 BNC ends be used for the RG-400?https://www.digikey.com/product-detail/en/amphenol-rf/31-320/ARF1039-ND/80127I found several deals on Ebay for these for the fraction of the cost from Digi-Key.Thank you**Update**I just went over the drawings for the Amphenol 31-320 BNC and the crimping ferrule's I.D. is too small for the RG-400.Instead, I purchased the correct Amphenol 000-36875 BNC's at $4 each.It seems that the same sized "body" is used in several Amphenol BNC versions but the ferrules are of different diameters.
Oscilloscope trigging oscilloscope - Page 1
Forum section: electronics / testgear

author: Sharp
author_rank: Contributor
timestamp: September 27, 2020, 09:15:37 pm
content: Hi GuysI have two scopes, a Rigol DS1054Z and the Rigol MSO5000.Is it possible to make the MSO trigging the 1054Z, so I can get 8 channels for testing ?

author: egonotto
author_rank: Super Contributor
timestamp: September 27, 2020, 10:42:58 pm
content: Hello,7 channels yes, but you can get trouble with time.The trigger out has a delay and the two timebases are not synchron.Why do you not try it out?Best regardsegonotto

author: Fungus
author_rank: Super Contributor
timestamp: September 28, 2020, 01:25:44 am
content: Quote from: Sharp on September 27, 2020, 09:15:37 pmYou can do seven: Connect the trigger out of the MSO to one of the input channels of the 1054Z then trigger off that.nb. You may get more accurate timing if you connect the DS1054Z to the same signal as the MSO and set up the same trigger condition.

author: David Hess
author_rank: Super Contributor
timestamp: September 28, 2020, 04:21:50 pm
content: Quote from: Fungus on September 28, 2020, 01:25:44 amThat only works at slow time/div settings where the added delay and jitter of the "trigger" output, which is not a trigger output at least on those DSOs, is small.In the more general case, the only way is to connect both instruments to the same trigger source and use the same trigger settings. In the past, a "trigger recognizer" might have been used as the trigger source for multiple instruments, which might have been as simple as a word recognizer, or analog oscilloscope or universal counter with a gate output.
Rigol DS1202Z-E or MSO5074 and LCR meter - Page 1
Forum section: electronics / testgear

author: grider99
author_rank: Newbie
timestamp: September 29, 2020, 03:29:22 am
content: Hello all,I'm in the market to buy an oscilloscope, I've been looking at Rigol and I'm not really sure of the best place to start. Buy a lower end cheaper model or buy a MSO and grow into it. I'm not looking to spend over 1K on a scope, ideally I'd like to spend less. What would anyone else do? DS1202Z-E or MSO5074?I'm also looking around for an LCR meter, maybe a Uni-T. Not sure. What's anyone else's experience with LCR meters? Looking to keep the LCR meter under 100 bucks.Last thing I'm looking for is a trusty Multi-meter. Any ideas for something under 200 bucks?So what am I working on? Mostly old school equipment, radios (fm/am, cb's, amplifiers), old and current PC motherboards, old retro computers (commodore/amiga, Texas Instruments, .etc..) old retro game consoles (Atari, Coleco, Nintendo, Sega, Sony, etc...)

author: ebclr
author_rank: Super Contributor
timestamp: September 29, 2020, 05:09:15 am
content: MSO5074 Is a must go for budget entry level ( nothing will gave you something near for the price ) , The multimeter is Fluke, I would prefer a used Fluke 87 than a new Unit meter. Fluke have endurance, if you dont need that buy a 30 USD meter that will be a better deal, only Fluke handheld deserve 200 a 300 USD avoid Agilent , they have good bench meters , but very problematic handheld ones

author: Fungus
author_rank: Super Contributor
timestamp: September 29, 2020, 06:13:10 am
content: Quote from: grider99 on September 29, 2020, 03:29:22 amIf you live in the USA the choice should be between MSO5074 and GW-Instek GDS1054B (both with hacks)https://www.tequipment.net/Instek/GDS-1054B/Digital-Oscilloscopes/?search=trueIf you have $1000 then get the MSO5074.For the jobs you describe though, the Instek is perfectly capable.Quote from: grider99 on September 29, 2020, 03:29:22 amLook at Brymen ("Greenlee" in the USA).nb. One meter isn't enough. Get one of those and something like this as well:https://www.aliexpress.com/item/33004463675.html
Tektronix TBS1000C released - Page 1
Forum section: electronics / testgear

author: Hydrawerk
author_rank: Super Contributor
timestamp: September 27, 2020, 11:12:20 pm
content: TBS1000C was launched in 8/2020.https://uk.tek.com/datasheet/digital-storage-oscilloscope-tbs1000c-series-datasheetIt has 20kpoints per channel but no video trigger. The scope is poor in general.https://www.electronics-lab.com/newark-introduces-new-tbs1000c-digital-storage-oscilloscope-from-tektronix/Any opinions?

author: tautech
author_rank: Super Contributor
timestamp: September 28, 2020, 01:12:04 am
content: Looks like convection cooled.Zero pics from above that might show slots in the case that can allow grud onto the PCB to start the corrosion that killed my TDS2012B.

author: wolfy007
author_rank: Frequent Contributor
timestamp: September 28, 2020, 01:41:36 am
content: wow, 20K memory per channel, its like we are living in 2000 when RAM was still expensive.I shudder to think what they plan to charge for this thing, ok just looked US$510 for base model no accessories. I wonder if anyone will buy it anyway, maybe someone who needs legacy compatibility?

author: Guy Shemesh
author_rank: Contributor
timestamp: September 28, 2020, 02:02:51 am
content: Seems like they are targeting these for educational use, and at a 500$ price range for the entry model they are giving a fight to the Chinese.The specs at the entry level are really basic, but in software they added their educational features and also FFT which does not increase the cost of the hardware.Smart move I think

author: knapik
author_rank: Regular Contributor
timestamp: September 28, 2020, 07:39:13 am
content: Would it really have been that hard to add a push button to reset the vertical position

author: knapik
author_rank: Regular Contributor
timestamp: September 28, 2020, 07:43:49 am
content: Quote from: Hydrawerk on September 27, 2020, 11:12:20 pmHuh, the TBS1102B here has a video trigger option.

author: 2N3055
author_rank: Super Contributor
timestamp: September 28, 2020, 09:18:26 am
content: You would have to be complete muppet to buy this. For that kind of money they ask for it, you can buy Keysight 1000 series if you want brand, or several Chinese ones...
3458A AZERO function not working ? - Page 1
Forum section: electronics / testgear

author: opa627bm
author_rank: Regular Contributor
timestamp: September 25, 2020, 04:24:25 am
content: Hi all,I have a brand new 3458A from Agilent, never been used.We just realized that the meter hold zero better without Azero function enabled.is that normal?with Azero enabled i have 0.00040mV offset, with Azero disabled, i only have 0.00010mV offset when input are shorted...Regards,Li

author: Kleinstein
author_rank: Super Contributor
timestamp: September 25, 2020, 10:22:01 am
content: The should be no significant offset in AZ mode. The 4 µV measured offset could however be from thermal EMF. So the type of cable can make a difference. The easiest good solution is probably a piece of bar copper wire - not using banana plugs.It may be just by accident that an external offset and the offset from the non AZ mode does cancels out.Another point can be that a new meter may need a call to ACAL is little more frequent for the first 2 weeks or so.
Names for creative mounting solutions for test equipment? - Page 1
Forum section: electronics / testgear

author: cdev
author_rank: Super Contributor
timestamp: September 24, 2020, 01:04:50 pm
content: I have a bunch of small (mostly low voltage/low power) electronics instruments. I'd like to have a way to hold them above my desk while I'm using them, then move them back out of the way.the space I have to use is small and I like to have things in reach. but always cluttered, so it would be great if I could use some kind of gantry or a stack of them on poles at the side to hold small instruments?? I have a bunch of very small instruments, that hook up to the computer, I know, I should get an analog discovery or similar, to consolidate the mess, but thats kind of pricy, and Ive grown attached to the ones I have.What am I looking for? (search terms)Maybe I can build something myself with those kind of erector set materials that people use in CNCs, it doesnt have to be super strong because most of my tools are very light and cheap, and the ones I am using change.In fact ideally it would be easy to move between different desks.

author: David Hess
author_rank: Super Contributor
timestamp: September 24, 2020, 10:38:38 pm
content: A wooden shelf, sort of like a small bookcase, is easy enough to make to fit on the back of a desk.
Tektronix 465 Channel 2 issue - Page 1
Forum section: electronics / testgear

author: 8bitmime
author_rank: Newbie
timestamp: September 23, 2020, 04:47:42 am
content: Hello Everyone,new to the forum but excited to be here.I recently purchase a Tektronix 465 oscilloscope, the price was right and it was in pretty good looking shape. when I got it home though an plugged it in, channel 2 started to give me some issues. Channel 1 is all fine and dandy but channel 2 gives me the behavior shown in the video below (its short but it gets the point across).I have already spent an hour or two google-ing the issue. I started with "oscilloscope channel skipping" and didnt see anything similar to my results. I tried "oscilloscope channel doubling" and "oscilloscope channel flashing" also to little effect. Ive tried specifying the make / model as well to see if any other users with this machine have had similar issues and havent seen anything too promising.I have not yet torn the machine down and given it a good cleaning (I know this is always the first step), but I got it monday night and didnt have a chance to open it yesterday or today, i probably wont really get to open and clean it really good until this weekend.I wanted to post here and see if anyone has seen similar behavior from a machine. At this point the only thing I have on the docket to try is giving it a really good cleaning to see if its just a bad contact somewhere, but im not sure if that is really the problem. Ive never fixed an oscilloscope before but im no stranger to electrical projects. Please forgive the vimeo link, i was unable to attatch my video directly to this message, it was too big.Link to video of my issue:Please forgive also the stupid video name, i forgot to name it when I uploaded it.Thank you all for the advice in advance.

author: med6753
author_rank: Super Contributor
timestamp: September 23, 2020, 01:00:15 pm
content: First, download a service manual if you haven't already. There are lots of sources out there.A good cleaning first couldn't hurt.Since channel 1 and 2 are identical on the Vertical Pre-amp board the best way to troubleshoot this is to apply an identical signal, such as the calibrator, to both channels and then probe each signal path until the issue is located. But that assumes you have another scope to trace it and I assume you don't. In that case you are limited to troubleshooting DC voltages only assuming you have a DMM. And you most likely won't narrow the issue down.Can you borrow another scope from someone? Using another scope would be the quickest and most efficient way of tracking down the problem.

author: 8bitmime
author_rank: Newbie
timestamp: September 23, 2020, 02:06:26 pm
content: I do not have another scope and cant borrow one from anywhere at the current time.Ive already downloaded the manual and im reading it as time permits.Thank you for the suggestion, this weekend when I bust it open ill give the vertical preamp a visual inspection. i wont be able to debug anything too seriously but I can always check for burnt components.
B&K 1688 power supply - Page 1
Forum section: electronics / testgear

author: xxx2fan
author_rank: Contributor
timestamp: September 23, 2020, 10:53:12 pm
content: Looking for manual for this unit. B&K 1688 power supply. Its and older model. Linear supply. a Schematic also if someone can help.I would like to adjust the pots so the meters read correctly also so any thing would be a help.Thanks.

author: ledtester
author_rank: Super Contributor
timestamp: September 23, 2020, 11:25:14 pm
content: If it's a 1688A, then here is the manual:https://bkpmedia.s3.amazonaws.com/downloads/manuals/en-us/1688A_manual.pdf(found via this page:https://www.bkprecision.com/search.html?q=1688a)and the meter adjustment instructions are on page 11.

author: xxx2fan
author_rank: Contributor
timestamp: September 24, 2020, 12:52:10 am
content: It's not a 1688A it is just plain. 1688 no letters a all. Serial no 225-3375i had found the 1688A but it isn't the unit I haveThanks

author: JFJ
author_rank: Regular Contributor
timestamp: September 24, 2020, 01:58:35 am
content: The file "1688_compo.pdf" appears to contain a component list and schematic diagram for the BK Precision Model 1688 power supply. It can be downloaded from here:http://bama.edebris.com/manuals/b&k/1688

author: xxx2fan
author_rank: Contributor
timestamp: September 24, 2020, 09:13:27 pm
content: Thank you I missed that.Thanks again B&K stopped support 2002

author: xxx2fan
author_rank: Contributor
timestamp: September 24, 2020, 09:53:26 pm
content: Still would like a manual if anyone has itThanks for help
Rigol DM3058E open source data logging possible? - Page 1
Forum section: electronics / testgear

author: dssence
author_rank: Regular Contributor
timestamp: September 25, 2020, 05:18:33 am
content: Hi friends, I'm almost deciding myself on buying rigol DM3058E benchmeter. But I need to know if anyone has succeded on using it's data logging feature on windows. I don't know if you can interface it via USB with some sort of galvanic isolation or Rs232 Basically I need the meter to be able to interface with windows with an on screen meter on any of the options like diode / volts etc. As I'm doing repairs I will be using it mostly to show realtime on screen my repairs with software like OBS.

author: HKJ
author_rank: Super Contributor
timestamp: September 25, 2020, 06:52:23 am
content: Take a look on TestController:https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/orhttps://lygte-info.dk/project/TestControllerIntro%20UK.htmlIt supports DM3058 and many other bench meters.

author: 2N3055
author_rank: Super Contributor
timestamp: September 25, 2020, 06:53:36 am
content: Digital part of multimeter is isolated from measurements by definition. Isolation is not much, it is specified in datasheet. Read it carefully.If you want to log much, maybe version with ethernet is even more versatile to log.I have DM3068, and had been logging voltage measurements via SCPI over ethernet for weeks at a time with no problems...Serial logging should be no problem either, with USB I would be more concerned with stability of USB on PC long term (drivers and such)..USB can be fiddly sometimes..Make note that it doesn't have software to show measurements on the screen like you want. You would have to make it yourself or get some software that works with it.If meter is for that particular purpose, I would start by finding what software is perfect for me and then get meter that works with it.Also, that is quite high end meter for just repairs. You could get simpler meter that would be quite adequate for this purpose...
SDS2102X Plus Enhanced Bit Function - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: September 17, 2020, 12:14:53 am
content: I've been spending some time with SDS2102X Plus and did some experiments to "see" how the Enhanced Bits function behaves.Test setup used the DSO AWG set to 50 ohms, 1MHz at 2mvptp, DSO set to 50 ohms, 0.5mv/div, 20ms/div on Channel 1. In the 3 screen captures below, F1 is the normal FFT (FFT(C1)), average 4, 0dBM reference and 20db/div, Center Freq 1MHz, span 1MHz, F2 is the same as F1 except it's the FFT of the "eres" function (FFT(eres(C1)).The 1st screen capture has Enhanced Bits set to 1.0, 2nd to 2.0 and 3rd to 3.0.Note how the noise floor drops (Marker 2 @ 1.1MHz) with the Enhanced Bits and how it drops faster than the signal level (Marker 1 @ 1MHz), this improves the SNR. Also note how F2 has the noise floor showing notches in the 3rd capture on either side of 1MHz!!Does anyone know the algorithms used by Siglent in the SDS2102X Plus DSO for the Enhanced Bits function (eres)?Best,Here's 3 more with the input at about -93dBm and the reference level at -40dBm.

author: Performa01
author_rank: Super Contributor
timestamp: September 19, 2020, 05:02:46 pm
content: Here is a LeCroy document explaining ERES vs. HiRes:https://teledynelecroy.com/doc/differences-between-eres-and-hiresEven though Siglent calls their resolution enhancement technique "Eres", hence very similar to the LeCroy thing, there is no evidence that it's actually the same as LeCroy's implementation. It might just as well be an ordinary HiRes...

author: mawyatt
author_rank: Super Contributor
timestamp: September 19, 2020, 05:35:22 pm
content: Thanks so much for the info (and the excellent discussion on the FFT use).So it appears the ERES function is a FIR linear phase filter and the waveform is selectively filtered based upon nearest neighbor samples and thus somewhat of a correlation result.It's so nice to have all these features and capability in a modest priced DSO, the more I work with the SDS2102X Plus the more impressed I amBest,

author: mawyatt
author_rank: Super Contributor
timestamp: September 23, 2020, 08:36:10 pm
content: Just did a few more experiments with the FFT function of the SDS2102X Plus.This is the "average" of the FFT of the waveform in F1 and the FFT of the waveform "average". The waveform is a small 1mvpp (-69dBvrms) input at 1MHz, and not very "clean".F1 is doing an average after the FFT, and F2 is doing an FFT of the {average of the waveform}, thus F1 is a Frequency Domain average. Note how F2 has a significantly lower noise floor, and the harmonics are lower.Best,