hybridfree/eevblog-posts huggingface dataset:
Rigol 5000 Bugs. - Page 1
Forum section: electronics / testgear

author: mrpackethead
author_rank: Super Contributor
timestamp: January 02, 2019, 04:57:53 pm
content: A nice thread so we can put the bugs in the Rigol 5000 over here, and keep the general discussion and hacking threads a little more coherent.

author: bmx
author_rank: Contributor
timestamp: January 02, 2019, 05:07:09 pm
content: let's start!get the test signal on CH1 (square, 3V).Trigger rising slope. The first edge on the left of the screen is, say, rising.Next, move the trace down, until ... the first edge on the left flips to falling, wtf?Related: The trigger level don't follow the vertical resolution you chose to change, constant need to adjust the trigger level while zooming.

author: Martin72
author_rank: Super Contributor
timestamp: January 02, 2019, 09:27:36 pm
content: Ok,I got 3 ones, mhh…, maybe only one to be fixed and two "nice to have changed" :Event table (serial decoding) : goes off when pressing the menu back button or any channel button - it should be only setting on/off manually. (Bug)Math function filters : Lowest cutoff frequency depends on the timebase-setting, it´s too high to display a filtered signal (i.e. lowpass function) proper. (could be a bug)Pulsewidth modulation signal couldn´t be stable displayed, it always "jitters" as if the trigger level wasn´t correct adjusted (not sure if this is a bug or a missing feature)Carry on...

author: dren.dk
author_rank: Regular Contributor
timestamp: January 04, 2019, 03:26:02 pm
content: Just got my MSO5072 and upgraded it, so far the most offensive thing about it is the fan noise which will get replaced as soon as I can buy a proper one.

author: dren.dk
author_rank: Regular Contributor
timestamp: January 05, 2019, 06:30:15 pm
content: Here's a bug I have not seen anybody talk about yet: Editing settings for email is completely broken, it seems like the retarded UI wants you to enter each word individually and then put punctuation in afterwards, so there are two different input fields, one for the value you're trying to edit and another one for the word that's being entered.Whoever made that atrocious UI should be broken on the wheel!Anyway once I was done wading though setting up the mail I could not make it work, because it seems there's only one particular smtp server configuration supported: Without TLS (wtf) and with login.It seems the UI creates /rigol/data/email/etc/msmtprc every time it needs to send an email and then it invokes /rigol/data/email/bin/msmtp with the config file, which means that it's possible to test the email configuration using something like this:<root@rigol>echo Test | ./msmtp -C ../etc/msmtprc foo@example.commsmtp: the server does not support authenticationmsmtp: could not send mail (account default from ../etc/msmtprc)The above error is what you get when you try to use a plain smtp server that doesn't want any authentication.I see no way to turn off authentication via the UI.
UT61E backlight mod question - Page 1
Forum section: electronics / testgear

author: jayjr1105
author_rank: Regular Contributor
timestamp: January 09, 2019, 08:56:40 pm
content: I'm thinking about grabbing a UT61E and I've googled around to look at the various methods of backlight mods. I'm not thinking I'll go with the capacitive mod or the light sensor. Is there a way to modify the eeprom to have the hold light do it when held in for a few seconds? I'm all about modding but I'm a stickler for keeping things looking nice and original. I don't want a dumb toggle switch hanging off the back or anything like that.

author: Shock
author_rank: Super Contributor
timestamp: January 11, 2019, 04:10:40 pm
content: One possible solution to turn the backlight back into an on/off switch is use an analog or digital latching circuit. Something that triggers on voltage to the backlight (or a signal if present) keeping the backlight on and after xx seconds have elapsed and if it triggers again it unlatches. Either that or powering off the meter releases the latch. This would mean no physical switch or enclosure mods are required and more likely to maintain the meters integrity.

author: Kbird
author_rank: Regular Contributor
timestamp: January 13, 2019, 02:04:57 am
content: Quote from: Shock on January 11, 2019, 04:10:40 pmI returned mine and got a 139C , but the Mods for it and the 210E are the same as they used the same Chipset.....that is over a year agonow and they may not be using the same Chipset any longer so do your research 1st.https://www.eevblog.com/forum/testgear/uni-t-ut139c-lcd-biasing-(schematics-avail)/msg1165035/#msg1165035https://www.eevblog.com/forum/testgear/a-look-at-the-uni-t-ut210e/msg1034969/#msg1034969

author: jayjr1105
author_rank: Regular Contributor
timestamp: January 14, 2019, 06:43:35 pm
content: Quote from: Kbird on January 13, 2019, 02:04:57 amI was really torn over the 139C and 61E but I wanted the higher counts, fast autoranging, and data logging. Plus the 139C is $10-15 more than what it was a year ago. Prices are inflated for some reason.
HP3478A banana plug incompatibility - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: January 05, 2019, 11:48:54 pm
content: I recently acquired a few HP3478A digital VOM.Oddly enough, today's common probes won't fit as the receptacles are not designed to accept sleeves around the prong. I know the fix is to cut off the sleeves and that's what I did. Works now.But does anyone know the history behind this change? Today's multi-meters all use sleeved banana plugs. I see a logic in it that if it should come lose, it won't expose the energized terminals. But when did this change happen? Is there a code/law/regulation that now require this?

author: GreyWoolfe
author_rank: Unknown
timestamp: January 06, 2019, 01:01:37 am
content: If you have meters that use shielded and unshielded banana plug leads, these are available from Pomona. I bought a set to try. They are not right angle and a bit long, which for some may be inconvenient, but they work well. I may get another set or 2.https://www.digikey.com/product-detail/en/pomona-electronics/122506A/501-1120-ND/604315

author: tkamiya
author_rank: Super Contributor
timestamp: January 06, 2019, 01:42:57 am
content: Thank you.Any thoughts on why there are two kinds of standards? I only use low voltage so it really isn't necessary to have extra protection.

author: 0culus
author_rank: Super Contributor
timestamp: January 06, 2019, 02:19:48 am
content: I only work with low voltage as well (at least for the time being) so I bought a set of these for my 3455A:https://www.tequipment.net/FlukeTL940.htmlThey are very nice, and the minigrabbers are convenient for the small stuff I tend to work on.

author: David Hess
author_rank: Super Contributor
timestamp: January 06, 2019, 03:29:30 am
content: I do not think it is exactly required but it changed around 1980 and it did have to do with safety regulations. Oscilloscopes probes smaller than 5mm with the 300 to 400 volt rating of the oscilloscopes they were used with also vanished at this time.I much prefer the older style binding posts which accept an exposed banana jack, Y-terminal, or wire.

author: mtdoc
author_rank: Super Contributor
timestamp: January 06, 2019, 05:50:59 am
content: Get a set ofProbamaster probes with retractable shrouds (8018S option). Excellent probes that work great with th HP3478A.
Any toughts about  Bside ADM20 DMM? - Page 1
Forum section: electronics / testgear

author: lanosalf
author_rank: Newbie
timestamp: November 25, 2017, 07:30:29 pm
content: I can't find any information, besides one youtube reviewAnyone own it?How is it compared to de UT139C?I'm interested in true rms, temperature, low price and if possible connection to PC.That's why i end up with this two choices UT139C and this "unknown" ADM20. The ADM20 has USB PC connectivity.Is BSIDE ADM20 USB connection protocol known?any suggestion would be appreciated, thanks in advance.ps: ADM20 instead of using IR connectivity use direct usb connection? could it be harmful to the PC if some problem occur in the DMM while measuring?

author: 001
author_rank: Super Contributor
timestamp: November 25, 2017, 08:09:11 pm
content: It is not fast DMMGo with UT139 or same chip AN8002 890 etcMy own recommendation is MS8250C - extra speedy and 6600 counts + REAL bargraph

author: Inflex
author_rank: Regular Contributor
timestamp: August 23, 2018, 12:56:20 am
content: A little late to this topic, but I've put out a simplified multimeter software for this meter.https://github.com/inflex/BSIDE-ADM20Still tweaking it and filling out all the features but for now it working with Windows.What's interesting is that the chip used in it (DTM0660) usually has a 14~15 byte packet as I understand but this one seems to have been padded out to 22 bytes and doesn't use the shot-gun of bits across bytes to represent the segments on the display.

author: foxabilo
author_rank: Newbie
timestamp: September 13, 2018, 03:52:40 pm
content: Perfect timing Mr Inflex *yoynk* TY for the code

author: Inflex
author_rank: Regular Contributor
timestamp: September 13, 2018, 03:55:40 pm
content: Of all the people in the world, fancy you happening to pick up this code. Good luck with it, aside from the preliminary work to get it "working well enough" I've not had much of a chance to do much more.I want to do a wifi or 433MHz conversion for it next.

author: JaspaJami
author_rank: Contributor
timestamp: January 04, 2019, 12:29:28 pm
content: Can owner of this device take different measurements and provide output of the serial data that it transmits?

author: PaulAm
author_rank: Frequent Contributor
timestamp: January 06, 2019, 12:44:04 am
content: Oops, sorry, post got in the wrong thread.
Keithley 740 schematic missing from manual - Page 1
Forum section: electronics / testgear

author: cibolo
author_rank: Newbie
timestamp: January 05, 2019, 05:26:09 pm
content: There is a manual from tek.com that refers to a digital or motherboard schematic, but not included in the scan pdf. Do you have a paper manual with the digital board schematic, or know another source?Mine is self testing partly OK and has B.0 firmware, but has corrosion from the NVRAM backup battery failing, and a trace that seems burned open that runs under the transformer and is hard to see. The motherboard pcb has part number 740-102-02E. It can't complete an ice bath calibration or save readings since no battery backup -- I'm going to fix that.
Power Designs Model 2005 - slow to settle? - Page 1
Forum section: electronics / testgear

author: essele
author_rank: Frequent Contributor
timestamp: January 05, 2019, 05:04:37 pm
content: Hi,I managed to get myself a Power Designs model 2005 after seeing Dave's video on it ... absolutely beautiful!Once I cleaned the contacts and experimented with the jumpers I've got it nicely calibrated, all seems to work pretty well.The only issue I've seen is that it's quite slow to settle, especially when I switch between ranges, but also when I make relatively coarse changes, if I go from 20.000v to 10.000v for example, it hits about 10.030 within a second or two, then spends the next 30 seconds slowly settling down to 10.000. Once it's settled it's pretty solid usually only see a variation of a few uV on my 34470.Is that expected behaviour, or is it indicative of a problem?Cheers,Lee.

author: wn1fju
author_rank: Frequent Contributor
timestamp: January 05, 2019, 11:24:53 pm
content: My 2005 drops from 20 to 10 volts to within a couple of mV in a few seconds. Then it slowly drops for about 15 seconds before I would consider it stable.I have a couple of HP precision power supplies that also take several seconds to settle down.Don't really know if it is all expected, but there are often fairly large capacitors hanging across the output.

author: David Hess
author_rank: Super Contributor
timestamp: January 06, 2019, 12:22:53 pm
content: It looks to me like that would be caused by uneven heating of the differential transistor pair when they are momentarily unbalanced. The time constant is about right for this. There are some circuit design tricks to minimize it but Power Designs did not use them.Monolithic differential pairs settle much faster (microseconds) because the transistors are in close proximity on the same piece of silicon.

author: vindoline
author_rank: Unknown
timestamp: January 07, 2019, 02:18:00 pm
content: I don't have a PD2005, but my 2005A doesn't exhibit this behavior. Is your heater operating normally?

author: David Hess
author_rank: Super Contributor
timestamp: January 08, 2019, 03:02:59 am
content: Quote from: vindoline on January 07, 2019, 02:18:00 pmThe 2005A uses a very different circuit.
Communication among test instruments: SCPI/REST/WHATNOT? - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: January 03, 2019, 09:45:39 am
content: One manufacturer tech rep (or managing director or something) yesterday told me that "REST is where the whole world is going" and that SCPI is not catholic enough (i e not generally available in all programming languages).Is he right?REST assured that REST methods can be easily accessed from any PROGRAMMING environment, albeit a bit quaintly compared to real language APIs, but REST isn't actually functionally superior to anything, is it?

author: 2N3055
author_rank: Super Contributor
timestamp: January 03, 2019, 10:44:04 am
content: That person probably is marketing director and probably confused SOAP and SCPI..........

author: Kean
author_rank: Unknown
timestamp: January 03, 2019, 11:10:47 am
content: Quote from: 2N3055 on January 03, 2019, 10:44:04 amAgreed

author: colorado.rob
author_rank: Frequent Contributor
timestamp: January 03, 2019, 01:47:38 pm
content: To be fair, a REST interface for test equipment would improve automation greatly. The benefit of SCPI and LXI is that it is a standard. As long as industry can standardize, a REST interface would be welcome. The ability to stream data via websockets would be good, too. Anything that rids us of NI VISA driver is a good thing.

author: 2N3055
author_rank: Super Contributor
timestamp: January 03, 2019, 02:05:47 pm
content: Quote from: colorado.rob on January 03, 2019, 01:47:38 pmCompletely disagree. SCPI is simple string protocol, that can (and is) implemented with a poor little RS232, and/or anything that can carry a string.NI VISA is crap API implementation, that is crap because if of how NI implemented it.Pushing web server and web server protocols to every single piece of measurement equipment is equally misguided as saying that SCPI would be better replaced by JAVA....I don't even use NI VISA most of the time. It is trivial to open socket to SCPI port and just exchange strings with it. Or I use RS232.. I have many instruments with different ports.But even NI VISA is fantastic compared to converting it all to web crap.How do you propose to speak with RS232, GPIB using REST?If we need to do something we would need to provide good replacement for VISA, not mess with commands on instruments.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: January 03, 2019, 06:12:14 pm
content: Welcome to the 21st century. We have gigabit Ethernet now.No one is going to confiscate your GPIB equipment just because an equipment manufacturer makes a new REST interface available. Hell, even the LXI interface will probably live right along side a REST interface for a good long while, just like that useless GPIB interface does on my networked bench meter. As long as there is demand for it, the manufacturers will provide it.
Pulseview and DE-5000 - Page 1
Forum section: electronics / testgear

author: Andbro
author_rank: Regular Contributor
timestamp: January 04, 2019, 12:47:37 pm
content: Hi,I'm a newbie with Pulseview. I have a LCR DE-5000 and I want to see the data on the bus. Do you can explain what I need and how to do it.Thanks for your precious time.

author: cs.dk
author_rank: Unknown
timestamp: January 05, 2019, 07:27:53 am
content: If i'm finding the right Pulseview; "PulseView (sometimes abbreviated as "PV") is a Qt based logic analyzer, oscilloscope and MSO GUI for sigrok. "I'm 100% sure it won't work with a LCR-meter. Your LCR-meter have nothing in common with a scope/LA.

author: voltsandjolts
author_rank: Unknown
timestamp: January 05, 2019, 09:21:55 am
content: The DE-5000 has an optical interface option (DE-5000-USB) as shown in EEVBlog vid below.I think the OP wants to spy on the serial comms protocol - easiest way would be to buy a DE-5000-USB interface and use a COM spy on the PC.https://youtu.be/ji-UT7HJm0Q?t=126

author: Andbro
author_rank: Regular Contributor
timestamp: January 05, 2019, 09:44:35 am
content: On the website of pulseview, hardware support, the DE-5000 is on the list of LCR supported.
Tek 453 MOD703k - Page 1
Forum section: electronics / testgear

author: munorc
author_rank: Regular Contributor
timestamp: January 01, 2019, 04:40:36 pm
content: I have a Tek 453 scope that I have had on my bench for a few years. I never paid much attention to its oddities until I started looking through the manual as a reference for another 453 that is missing the Variable/Cal knob for the sweep control.This 453 does not have a side panel and the calibration loop is on the front. Looking closer, I see it is marked MOD703K. I find a few scattered references that it was a version made for the USAF and has an 8 division high screen instead of 6.Any more details available?

author: particleman
author_rank: Regular Contributor
timestamp: January 01, 2019, 06:42:23 pm
content: Nice oscilloscope. Here is a good link on the changes in MOD703K.https://groups.io/g/TekScopes/topic/7631583#8508

author: munorc
author_rank: Regular Contributor
timestamp: January 01, 2019, 06:55:33 pm
content: Thanks. That is more info than I had found previously.From that post:703K: Added SAWTOOTH OUT on the rear, CH1 OUT moved to front, A and Bgate added on the rear, Calibrator Current Loop added on front and 1VCAL connector moved, Added TRACE FINDER to the front, Added X-Yposition to the HORIZ DISPLAY switch, Deleted RESET light, Added newfunctions to the Delayed sweep triggering switch.703H: The 453 Mod 703H is a Tektronix Type 453 Oscilloscopeequipped with a larger, 8 x 10 division CRT, with risetime-patterninternal graticule, an added SAWTOOTH OUT facility, increased CH 1OUT amplitude and an all-solid-state HV supply. The side panel andcertain low-usage controls, features, accessories and sweep rangesare deleted. Performance limits and test procedures are changed toreflect the specific requiremnets of MIL-0-9960C (USAF).As alluded to in that thread, the one I have has a serial number prefixed with "B".

author: munorc
author_rank: Regular Contributor
timestamp: January 02, 2019, 11:21:19 pm
content: Hmmm, the other 453, with the missing knob, is a MOD703K as well.Attached is a picture of the scope with the missing knob. Since there is nothing to attach to, I assume also missing is a shaft that would attach to a pot at the back of the switch stack. I looked inside, but it is pretty crowded in there. Is this held with a set screw or some other means?

author: munorc
author_rank: Regular Contributor
timestamp: January 03, 2019, 05:56:48 pm
content: Would the question regarding teh missing knob be more appropriate in the Repair forum? New hear and I did not notice there was a separate section.
Tektronix 015-0611-00 Pulse head for CG5011? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: January 04, 2019, 10:38:28 am
content: I know it's an amazingly long shot, but I have a lonely CG5011 that's pining for the fjords (sorry for a pulse head).Does anyone have a suitable pulse head that they'd part with? Ideally it would be an 015-0611-01, but an 015-611-00, or a 015-311-01 would work OKOK, you can pick yourselves up off the floor and stop laughing now!.ThanksDavid
Pc performance requirements for easy use of QuantAsylum QA401? - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: December 31, 2018, 06:14:06 pm
content: What level of performance is required of the PC to use for controlling the qa401?Would a Minix Z83-4 do?

author: DaJMasta
author_rank: Super Contributor
timestamp: December 31, 2018, 06:57:06 pm
content: Don't own one so I can't say for sure, but I would assume that a modern quad core atom would do the job. Modern CPUs have a lot of realtime multimedia features and can handle a lot of moving data... and even high sample rate/resolution audio doesn't even count as that these days, so I'd assume the software will run on most anything. Sure, you'll get faster response, better encoding times, and better computational analysis speeds with better hardware, but unless you're trying to do a fair bit of processing in realtime, that CPU is likely plenty.

author: Calvin
author_rank: Regular Contributor
timestamp: January 01, 2019, 08:56:03 am
content: Hi,I´m running WIN10Pro on a MSI Z170 Mainboard, Intel Core i3 6100 processor and 8GB RAM.The Quant401 works flawlessly on that system.regardsCalvin

author: n3mmr
author_rank: Regular Contributor
timestamp: January 01, 2019, 12:55:02 pm
content: Quote from: Calvin on January 01, 2019, 08:56:03 amWell, that's a fairly competent gaming PC, with a 3.70 GHz multicore cpu.

author: maginnovision
author_rank: Super Contributor
timestamp: January 01, 2019, 02:59:11 pm
content: I wouldn't expect the requirements to be very high but you should probably contact QA to get an answer.

author: Calvin
author_rank: Regular Contributor
timestamp: January 01, 2019, 03:53:23 pm
content: Hi,uh oh, and I thought I´d do serious workjauuCalvin

author: billfernandez
author_rank: Regular Contributor
timestamp: January 02, 2019, 04:24:29 pm
content: I use an old Dell tower and it works fine.Manufacturer = DellModel = Inspiron 3847 (early 2013)OS = Windows 7 Professional Service Pack 1Processor = Intel Core i5-4440 @ 3.10GHzRAM = 12GB, Dual Channel DDR3 1600MHz (16GB max)HD = 1TB, 7200 rpm

author: bicycleguy
author_rank: Frequent Contributor
timestamp: January 02, 2019, 11:37:03 pm
content: I run an older QA100 Oscilliscope on a 2007 MacBook booted to Windoz 7 and it runs fine. All the PC does is the graphics, the QA401 might work the same.

author: n3mmr
author_rank: Regular Contributor
timestamp: January 03, 2019, 11:47:13 am
content: I got an answer from QuantAsylum, Matt.He thinks it's a non-issue, the worst bit is doing the long and deep FFTs, and most any pc on the market will manage.I suppose I should have known: Reaper with a dozen heavy lifting plugins runs w/o any problems on my old Bay Trail desktop, so a Z83-4 will likely manage.
DEKAPOT model differences - Page 1
Forum section: electronics / testgear

author: munorc
author_rank: Regular Contributor
timestamp: January 01, 2019, 07:54:07 pm
content: In looking though a box of panel meters, I found a surpise, a Dekapot model X537-1.In looking at past posts, I see some discussion of these. IET Labs still sells the DP-1211 and DP-1311 and has spec sheets posted.This unit is labeled Voltage Divider, Resisistive, Decade. The DP-1211 and DP-1311 are labeled Kelvin-Varley Voltage Divider.ESI seemed to have pretty broad range of model numbers and there does not seem to be any pattern to them, i.e. X537-1 vs. DP-1211.Does anyone have specs beyond what I find for the DP-1211 and DP-1311?Internally, are these similar or are they different designs for different purposes?

author: PedroDaGr8
author_rank: Super Contributor
timestamp: January 02, 2019, 11:17:57 pm
content: The Stock No implies something Military or Federal Government related as the PSC/FSC/NSN code for resistors starts with 5905. It would likely have an NSN of 5905-00-445-2551 or 5905-01-445-2551 (neither of which turn up anything).

author: munorc
author_rank: Regular Contributor
timestamp: January 02, 2019, 11:34:54 pm
content: If so, perhaps the 42 in the serial number is a year code. It differs slightly from the rest of the number.

author: lowimpedance
author_rank: Super Contributor
timestamp: January 03, 2019, 05:29:22 am
content: It does appear a much older style than the unit pictures in my 1974 ESI catalogue. No Mention of that model number and the 'DEKAPOT" name only refers to the KVD DP1211 and 1311.My guess is its most likely a DP1311 and the the 1Kinput resistance is also consistent with values listed in the catalogue. Testing would be needed to confirm or not.
Price of new TEKTRONIX 577 curve tracer - Page 1
Forum section: electronics / testgear

author: macfly
author_rank: Contributor
timestamp: December 27, 2018, 05:46:09 pm
content: Hello,can somebody tell me, what was the price of a new Tektronix 577 curve tracer in 1972 to 1974Regards,macfly

author: tv84
author_rank: Super Contributor
timestamp: December 27, 2018, 05:51:38 pm
content: Don't you have the DeLorean nearby?

author: CatalinaWOW
author_rank: Super Contributor
timestamp: December 27, 2018, 06:20:58 pm
content: According to the 1973 catalog the 576 was $2600 (no options included). The 577 isn't listed in that year. The 1976 catalog lists a non-storage 577 with no test fixture for $2300, the storage version for $2625 and the base test fixture was listed at $500.I don't know how those prices related to on the street prices. I worked at a very large company and we routinely got 30% off list price at purchase time. It was also rumored that the company got a large kickback at the end of the year based on total sales. The kickback was rumored to be another 20-30%.

author: macfly
author_rank: Contributor
timestamp: January 02, 2019, 09:12:04 pm
content: @ tv84:I drove my DeLorean to the scrapyard in 1983 ... too much rust@ CatalinaWOWThanks for your information. A quite expensive piece ....Regardsmacfly
SIGLENT SDG1032X Saved State File has no Data - Page 1
Forum section: electronics / testgear

author: mikemxyzzy
author_rank: Contributor
timestamp: December 31, 2018, 08:26:34 pm
content: I decided to try saving the state of my SDG1032X and I noticed that it was not restoring what I had the instrument set up to, so I looked in the file and sure enough there is no state data in it. The instrument says it is 50B, and here is the contents:<?xml version="1.0" encoding="UTF-8"?><STATE01/>Am I missing something? I expected to see the frequency, amplitude, waveform, output load, etc. all saved in the file.I updated to the latest firmware, but it made no difference.

author: tautech
author_rank: Super Contributor
timestamp: January 01, 2019, 12:15:22 am
content: Power ON settings = Last. ?

author: mikemxyzzy
author_rank: Contributor
timestamp: January 01, 2019, 07:16:29 pm
content: Aha! Power on Settings = Last worked!Now when I save the state I can see that the file contains the entire state of the instrument.Thanks tautech.
4192A LF Impedance Bridge Repair / Diag ROM - Page 1
Forum section: electronics / testgear

author: ezalys
author_rank: Frequent Contributor
timestamp: December 31, 2018, 11:18:34 pm
content: Does anyone have the self-test diag rom images for the 4192A? If not, how many people have brought them back to life without the ROM, and how much of a headache was it? They appear to be extremely complex instruments.The ICs are:16343-85001 (U74)16343-85002 (U85)Thanks!
Keithley 2303 - Page 1
Forum section: electronics / testgear

author: jpb
author_rank: Super Contributor
timestamp: December 30, 2018, 05:24:29 pm
content: I've just acquired a Keithley 2303 off ebay - I intend to use it to measure power as well as being a generally useful power supply and even a load (will sink a couple of amps I think) and a not bad Voltmeter.Dave did a teardown of the very similar 2302https://www.eevblog.com/forum/blog/eevblog-1005-keithley-2302-battery-simulator-teardown/msg1250235/#msg1250235I am very impressed with its accuracy as the following photos show - the difference between it and my two Keithley meters is around 1mV and is less than the measurement accuracy of my 5 1/2 digit meter : see attached photos.

author: jpb
author_rank: Super Contributor
timestamp: December 30, 2018, 05:31:02 pm
content: more photos...

author: coromonadalix
author_rank: Super Contributor
timestamp: December 30, 2018, 06:54:44 pm
content: A future Keithley "guru lover" loll nice pick
What Is the Classification of Semiconductor Memory? - Page 1
Forum section: electronics / testgear

author: 928928
author_rank: Newbie
timestamp: December 29, 2018, 06:09:27 am
content: Recently, I am studying the semiconductor memory, and I think it’s interesting and difficult, too.In fact, I just know little about it, but I have to learn it because of my work.Every weekend, I go to an institution to learn semiconductor memory. Besides, I also learn it in the Internet. I found that there are many excellent passages about semiconductor memory in the Internet and they help me a lot. Here, I want to share an article to you and it ‘s named The Working Principle and Classification of Semiconductor Memory (http://www.apogeeweb.net/article/157.html). This article talks something about semiconductor memory, such as the definition, the working principles, the classification and so on.However, I am still confused by the classification of the semiconductor memory. So here, do you have any good websites or passages about the classification of the semiconductor memory? If you have, could you please share them to me? Thanks a lot.

author: hamster_nz
author_rank: Super Contributor
timestamp: December 29, 2018, 06:30:39 am
content: It has a completely different focus than what you are after, but search for a PDF called "What Every Programmer Should Know About Memory".It is quite comprehensive overview (100+ pages) of memory technologies used in a modern PC, and how this can influence software design practices.Very interesting stuff if you want to understand a bit more about how the magic actually works.However, definitely it is not an overview of things like SLC or MLC Flash or EEPROMs or phase change memory and so on.
Real-time circuit tweaking while watching a miniVNA? - Page 1
Forum section: electronics / testgear

author: elroy
author_rank: Regular Contributor
timestamp: December 31, 2018, 09:37:41 pm
content: I recently bought a miniVNA Pro that I'm using with the provided vna/J software. My main use is looking at SWR, impedance, etc on ham antennas, transmission lines and impedance matching devices.One of the main things I'd like to do is to set it up to do real-time measurement at a single frequency as the circuit is changed. For example, watch how SWR changes as a variable capacitor in an LC tuning circuit attached to an antenna is turned. I'm running into two issues. First, the software seems to want a frequency range as opposed to a single test frequency. Second, when it's runs repeated scans there's a nontrivial delay (usually of a couple to a few seconds) as the scan is completed. So it's slow-going to tweak and watch how the result changes.Is there a way to do what I'd like to do? Or is this maybe not the instrument to use for this?

author: DaJMasta
author_rank: Super Contributor
timestamp: December 31, 2018, 10:21:02 pm
content: Not sure on the miniVNA in particular, but a zero span mode should give you no sweep - though even narrow sweeps can give you useful information about the performance surrounding the frequency of interest (watching the curve shape will actually help you tune a single frequency quicker, since you can see where the area of interest is even when not centered on that frequency). The delay may be linked to data transfer or computation time from the nature of the architecture of the instrument, but maybe it's worth looking around for ways to optimize update speed or look for videos of the unit in use to compare to what other people are seeing for delay times. It is normal to see some delay just because of the sweeping nature and any averaging in place, but a reasonably fast VNA can usually give you pretty snappy measurements. Maybe try lowering the number of points per sweep or increasing the RBW to see if it gets fast enough for your taste.

author: tautech
author_rank: Super Contributor
timestamp: January 01, 2019, 12:11:52 am
content: Normal.To see the bigger picture you need some span for the sweep and depending your RBW/VBW setting the sweep can take a while to complete.Have a study of the screenshots and text here:https://www.eevblog.com/forum/rf-microwave/antenna-project-log/
ACS712 as current probe and AC voltage module as voltage sensor  - Page 1
Forum section: electronics / testgear

author: hussamaldean
author_rank: Unknown
timestamp: December 29, 2018, 05:48:34 am
content: Hi allI am thinking to use ACS712 hall effect current measurement as cheap current probe which will be connected in series with the load and AC voltage module for arduinohere is the picture of the moduleI am planning to use those for power, PF and harmonic distortion on the load which will not draw more than 2A at max (Note : I will use isolation transformer to power the load ) while the current sensor can handle up to 30Amps peaks and the voltage sensor up to 1000Vrmswhat do you think about these module for such application?I hope it is a good idea since I have those module and I used them before for wireless power meter project of mine
Recommendation diff probe? - Page 1
Forum section: electronics / testgear

author: bitbanger
author_rank: Regular Contributor
timestamp: December 28, 2018, 12:21:08 am
content: Hi folks -I'd like to find a differential probe mainly for logic-level digital signaling (LVDS etc). Bandwidth of 100-150MHz. There seem to be plenty out there 50MHz and under, and I have one in fact. Also the bigger 'problem' is finding one that's scope agnostic - I often use a variety of scopes: Tek, Keysight, R&S,... so it would have to be powered by battery or externally.Budget is, well,...differential probes are never cheap, but preference to best bang-for-buck.Thanks!

author: nctnico
author_rank: Super Contributor
timestamp: December 28, 2018, 12:26:53 am
content: This is a bit of a sales pitch:A first production batch of my >1GHz differential probe design is on its way. More info in this thread:https://www.eevblog.com/forum/testgear/gt-1-ghz-diy-differential-probes/msg2016151/#msg2016151

author: bitbanger
author_rank: Regular Contributor
timestamp: December 28, 2018, 01:25:10 am
content: Tempting for my own personal use (going to subscribe to the thread) but for work it may be a tough sell.
Python module to control MHS-5200A. - Page 1
Forum section: electronics / testgear

author: jfr
author_rank: Newbie
timestamp: September 06, 2017, 02:17:15 am
content: Tested on Windows 7 & 10, Ubuntu LTS, and Rasberry Pi 3. Should run anything that can handle Python and 57600 bps.Generate a 1 Hz, 10 V-pp square wave with 0V offset:Code:from MHS5200 import MHS5200from MHS5200.Enums import Wavesignal_gen = MHS5200(port="/dev/ttyUSB0")chan1 = signal_gen.channelschan1.frequency = 1 # Hzchan1.amplitude = 10 # V-ppchan1.offset = 0 # Vchan1.wave = Wave.SQUAREAlso accepts "MHz" and "kHz" for setting the frequency.QuoteInstall:Code:pip install git+https://github.com/jed-frey/python_mhs5200.git#egg=mhs5200

author: kevinateev
author_rank: Regular Contributor
timestamp: December 29, 2018, 11:25:04 pm
content: Python makes a lot of sense to use. Regardless, FYI, an alternate utility written in Swift and compiled to a command line utility for macOS (could work on Linux? maybe soon)Allows control of unit plus upload of arbitrary waveforms.https://youtu.be/43wMURP_9eg
Fluke 79 III manual range  - Page 1
Forum section: electronics / testgear

author: albert001
author_rank: Regular Contributor
timestamp: December 27, 2018, 03:19:22 am
content: Hello,I recently purchased a used Fluke 79 Series III.The AC and DC voltage readings seem function ok. So far I haven't thoroughly tested other functions, most only DC.However I noticed that there is no response from the "Range" button from any of the rotary dial functions.When I press the "Hold" button "Manual" is briefly displayed from upper left and then a "HOLD" is displayed upper right of the display.I replaced the Fluke 79 III 9 volt battery with a new one, still the range button doesn't want to respond from any of the rotary switch settings.Earlier I did take the 79 III apart and removing the pcb (loosened small screw) and removed both fuses to inspect the circuit board quality and design.Then put everything back the same as it was.From what I read from a manual when I press the range button the display should show "manual"?While apart the range and hold buttons fell out and I placed them back the same as before.The internals of the meter are very clean. I didn't see an dust and debris particles from the inside.==========================================Update:I opened the Fluke 79 III and cleaned the button contacts (on the pcb and buttons) with a q-tip and some QD electronics cleaner. Both buttons now seem to be working as expected.So I guess the problem is only "dirty button contacts"?Perhaps when I re-installed the buttons, skin oil got onto the button contact?
Another happy Rigol DS2072A --> DS2302A Upgrader! - Page 1
Forum section: electronics / testgear

author: techman-001
author_rank: Frequent Contributor
timestamp: December 26, 2018, 01:41:14 pm
content: Thanks to all who made the upgrade possibleI used this howto:https://www.bambach.biz/projects/elektro/upgrade-rigol-ds2072a-to-ds2302a/with a mixture of :-1) Windows 10 Enterprise 90 day eval.2) FreeBSD3) LinuxEverything could be done with either Linux (fastest) or Windows 10 90 day eval (slowest).I started with Rigol factory FW: 00.03.00.SP1 but had to upgrade to FW: 00.03.05 when it came time for the Rigol to read the new Option code from a USB key, otherwise the USB key was ignored.All in all a pretty smooth process, and having all my options back is nice, plus 300MHz and 1nS/div doesn't hurt either.The howto had a interesting Rigol memory dump Ethernet method "echo “:SYST:UTIL:READ? 1,33554432” | nc -w1 <DS2072A-IP-Address> 5555 | dd bs=1 of=ds2072a.bin"This gave me the idea to make a shell script to download screen-pics from the Rigol into the present working directory, which saves a lot of time when I'm doing documentation. No special software is required apart from ImageMagick (convert), and a picture viewer ( I use feh) both are very common on Linux boxes and Open Source anyway.It uses the ubiquitous "sh", common to every UniX machine, and will warn you if it can't find the IP of your Rigol.I guess it should work on any Rigol with a Ethernet port.So here is my Xmas present to all Rigol users ;-) , you'll need to change the IP to suit your scope and your preferred picture viewer:-# --------------------------------------------- cut here ------------------------------------------------- ##!/bin/sh# file name: rcap.sh, run it from a xterm.# usage example "./rigcap.sh <picture_name>" produces picture_name.jpg# Copyright <terry@tjporter.com.au> 26 Dec 2018. Released under the FreeBSD Licence# Designed on FreeBSD but should run fine on Linux# Used with a Rigol DS2072A upgraded to DS2302A. Software:00.03.05, Hardware: 2.0# Dependencies: ImageMagick (convert), picture viewer (feh)# Standard base Unix system utilities: sh, ping, ncRIGOL_IP=192.168.0.18PICTURE_VIEWER=feh# --------------- shouldn't need to change anything below this line ------------------- #STRIPPED_FILE="$1_stripped.bmp"OUT_FILE="$1.jpg"BYTES_REMOVE_FRONT=11BYTES_REMOVE_REAR=1if ping -c1 -W3 $RIGOL_IP >/dev/null 2>&1thenecho ":DISPLAY:DATA?" | nc -w1 $RIGOL_IP 5555 | dd bs=1 of=$1BYTES=$(cat $1 | wc -c)X=$((BYTES-$BYTES_REMOVE_FRONT))Y=$((X-BYTES_REMOVE_REAR))dd if=$1 of=$STRIPPED_FILE bs=1 skip=11 count=$Yconvert $STRIPPED_FILE $OUT_FILE >/dev/null 2>&1rm $1rm $STRIPPED_FILEecho Rigol bitmap capture, bmp stripping and $OUT_FILE $(cat $OUT_FILE | wc -c) Bytes created.$PICTURE_VIEWER $OUT_FILE &elseecho "Rigol did not respond, is the IP Address correct and Rigol turned on ?" >&2fi# --------------------------------------------- cut here ------------------------------------------------- #Cheers,Terry
Tektronix 2213 Scope Hissing Like Mad! Need Help Troubleshooting. - Page 1
Forum section: electronics / testgear

author: K0EVN
author_rank: Newbie
timestamp: December 25, 2018, 07:25:07 pm
content: Hello,My Tektronix 2213 60MHz Oscilloscope started having issues a while ago and I'm just getting around to trouble shooting it. It was working fine for 6 or 7 months after its purchase on eBay and then one day I turned it on and it was functioning properly and then all of the sudden the CRT went dead, and the thing started hissing really loudly. The hiss is like around a 2000hz tone and it doesn't fluctuate. After about a second of it being turned on, just before the hissing, the trigger light flashes and then goes off. I'm not sure what happened, and I was wondering if anyone had experiences like mine and could help me out.Thanks,Evan K0EVN

author: K0EVN
author_rank: Newbie
timestamp: December 25, 2018, 07:40:35 pm
content: Update:I opened up the chassis again and the hissing seems to be coming from the high voltage area shielded with a metal panel and a bunch of warning stickers. I have a lot of experience with high voltage electronics and tube equipment but I'm only 14 and I'm still afraid. I'll discharge the electrolytics, but if there's anything else I need to know if before I of in, that'd be appreciated.Thanks!

author: David Hess
author_rank: Super Contributor
timestamp: December 26, 2018, 01:08:02 am
content: The 2213 has two different power supply versions. Which does yours have?http://www.hakanh.com/dl/docs/kitinstructions/045-0034-00.pdfhttp://www.hakanh.com/dl/docs/hardtofind/SUP3010.pdf

author: TERRA Operative
author_rank: Super Contributor
timestamp: December 26, 2018, 04:45:10 am
content: I'd start by replacing the capacitors on the output side of the PSU, and checking out the service bulletins posted above.I have some info in my video with cross references etc to modern parts that might prove useful.There's also a thread running on these sorts of scopes that might help too.https://www.eevblog.com/forum/testgear/tektronix-2235-repair-thread/

author: ezalys
author_rank: Frequent Contributor
timestamp: December 26, 2018, 09:12:31 pm
content: Check ALL supply voltages with a DMM and ripple with a scope.

author: FERCSA
author_rank: Contributor
timestamp: December 26, 2018, 09:54:11 pm
content: I'm confident it's one of the high voltage cap in the high voltage stage. I had a very similar issue with the same symptoms.One of the cap went bad and made a short, the result was a nice little arc.. you can see it in the dark.Also if you still there measure the none HV supply rails too, then adjust it based on the recommendation of the service manual.
Uploading Siglent SDS 2304X Logic Channels - Page 1
Forum section: electronics / testgear

author: daveb1
author_rank: Newbie
timestamp: December 24, 2018, 09:07:27 pm
content: Hi,I've just purchased a Siglent SDS 2304X and found to my horror that I can't remotely upload the digital channels via USB or VXI. It now looks like I can't save the entire data set to an external USB flash disk either.I've captured 14Mpts of 8 digital channels but when I save as binary to a 4GB external disk the resulting file size is in the 10's of kB. I suspect it's saving a screen dump. When I try to save as .CSV or .DAT I get the message "Store data failed".Has anyone managed to get an entire logic data set out of one of these scopes ?ThanksDave

author: colorado.rob
author_rank: Frequent Contributor
timestamp: December 24, 2018, 09:20:12 pm
content: Quote from: daveb1 on December 24, 2018, 09:07:27 pmI have tried. I have talked to Siglent about this directly. It cannot be done. The only Siglent MSOs that allow access the digital channel data are the newer X-E models. You can confrim this by reviewing the Siglent oscilloscope programming guide.It is a serious shortcoming of the scope. But it is one that Siglent, at least when I last spoke to them, claim can not and will not be addressed.

author: daveb1
author_rank: Newbie
timestamp: December 24, 2018, 09:57:34 pm
content: Hi colorado.robThanks for your reply.Just to be clear, as well as not being able to remotely upload digital data have you neither managed to save a full data set to a USB disk ?If there's no way to get digital data out then that's an unforgivable glaring omission and mine is going straight back !Dave

author: colorado.rob
author_rank: Frequent Contributor
timestamp: December 25, 2018, 11:06:07 pm
content: Quote from: daveb1 on December 24, 2018, 09:57:34 pmI have not tried. That would be useless to me. However, if it had the ability to save to USB, there would be nothing to prevent Siglent from sending it out the LAN interface.The cheap Saleae knock-offs do a better job as a logic analyzer than most MSOs.
Keysight/agilent/HP 665xA Power Supply Link Port usable for PC control? - Page 1
Forum section: electronics / testgear

author: fchk
author_rank: Frequent Contributor
timestamp: December 25, 2018, 07:44:06 pm
content: Hi!I've got an HP 6654A System Power Supply, working fine. I'm looking for a way to control it remotely now, but GPIB is an expensive option. I found out that these boxes have "link ports" for connecting several of them together with 6P6C modular cables so only one device needs an GPIB connection and the other ones get subaddresses. These link ports are connected in parallel an driven by an SN76176 RS485 transceiver.My idea is to to use this port as a control port. A USB-UART adapter is easy to get, and I guess any RS485 transceiver will do the job. FTDI chips already have RS485 support built-in (DE/!RE switching).Has anybody tried this yet and can give me any hints about bitrate or command set (SCPI or perhaps some binary protocol?)?I don't have a second 665xA and a GPIB interface for reverse engineering it myself.Happy Xmas!
Keysight MSOX3104T Licenses - Page 1
Forum section: electronics / testgear

author: maxpayne
author_rank: Regular Contributor
timestamp: December 24, 2018, 05:06:17 am
content: I bought a refurbished MSOX3104T from Ebay Keysight store. The Oscilloscope comes with the "DSOXT3APPBND" licenses. I can use the features without any problem/limitation.However when I go to help>about section, I can see there is a 30 day trial version message telling me to start the trial !My question is if all licenses are already installed why the trial version are prompted? It only happens when I go to Help>about section.

author: TheSteve
author_rank: Unknown
timestamp: December 24, 2018, 05:09:55 am
content: Totally normal, nothing to worry about. You have the full app suite.

author: LapTop006
author_rank: Unknown
timestamp: December 24, 2018, 11:46:55 am
content: Quote from: maxpayne on December 24, 2018, 05:06:17 amSadly normal, I wish there was a way to turn that prompt off.

author: maxpayne
author_rank: Regular Contributor
timestamp: December 24, 2018, 01:32:37 pm
content: What happens if I accidentally start the trial.... ?
Looking for a Tektronix PS282 power supply manual - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: September 27, 2016, 01:21:38 pm
content: Can't seem to find it online; anyone able to post it, or point me to it? Thanks...

author: denimdragon
author_rank: Regular Contributor
timestamp: February 03, 2018, 11:06:43 am
content: It's a bit late, but I was searching for the manual myself and ran across this thread. I decided to upload it in case someone else needs it.

author: gimp-e
author_rank: Newbie
timestamp: December 23, 2018, 01:41:45 am
content: I wanted to say thanks, too. I was looking for this manual, as well.