hybridfree/eevblog-posts huggingface dataset:
Calibrate PM6662 with PM9607 option - Page 1
Forum section: electronics / testgear

author: Rene Jansen
author_rank: Contributor
timestamp: January 25, 2022, 10:49:02 am
content: Hello electronics enthusiasts.I have a PM6662 counter with a PM9607 (option) oscillator which I want to calibrate.The (sevice) manual for the PM6662 is difficult to find, but there is plenty available for the PM6664 which also describes the calibration method with the PM9607 module.Calibration Procedure– Remove the cover from the counter.– Allow the MTCXO to adapt the new ambient temperature.(See ’Preparations’.)– Connect the 10 MHz reference to Input-A.– Switch ON the counter.– Adjust the sensitivity control so that the counter countsproperly.– Hold down the CALIB-button, on the main printed-circuitboard in the counter, and press theReset-button.– Wait about 20 seconds, until the display shows10.0000000 MHz. Now the oscillator is calibrated.– Switch OFF the counter and disconnect the 10 MHz reference.Fit the cover.But now the problem: there isno reset buttonon the PM6662. Furthermore, there is no calibration option on the PM9607 PCB.Does anyone know the procedure for this combination?Thank you

author: Rene Jansen
author_rank: Contributor
timestamp: February 01, 2022, 10:27:54 am
content: Finally managed to find the solution.It's both simple and obvious, use the only button available: "MEAS TIME" instead of "RESET"How simple can life be.....
Looking for IFR1900 service manual - Page 1
Forum section: electronics / testgear

author: BH3TXW
author_rank: Contributor
timestamp: January 28, 2022, 01:05:41 pm
content: Dears,I am also looking for the IFR 1900 Service manual or maintenance manual.Any help is much appreciated!Kind regards! Thank you!

author: BH3TXW
author_rank: Contributor
timestamp: January 30, 2022, 01:22:04 pm
content: Umm, 1900 manuals has been found.Thanks to everyone who gave advices.
Wanting to cal Wave Factory model WF1946 signal generator - Page 1
Forum section: electronics / testgear

author: eevcandies
author_rank: Regular Contributor
timestamp: December 03, 2019, 04:48:36 am
content: Hello:I am looking to calibrate my NF Electronics (brand): Wave Factory WF1946 Multifunction Synthesizer, specifically the frequency. ...anyone know of any service/cal manuals for these things?I suspect it is a software cal procedure.A generic picture of the unit:http://www.hitechfacility.co.jp/photo/big/gen4272.jpg--pretty sweet, but I'd like to freq to be somewhat accurate!

author: dl1640
author_rank: Regular Contributor
timestamp: July 15, 2021, 10:25:46 pm
content: Didn't find any service manual either, mine is having significant dc offset when offset set to 0V...as the frequency goes higher the situation gets worse

author: Mike G
author_rank: Regular Contributor
timestamp: January 11, 2022, 03:09:17 pm
content: I too have a WF1946B. nice piece of kit but I need a copy of the Arbitrary software that was originally bundled with it when new, can anyone help please?

author: eevcandies
author_rank: Regular Contributor
timestamp: January 29, 2022, 10:37:02 am
content: Did you try any of these (maybe one will work for more than one model type)...worth trying!!https://www.nfcorp.co.jp/english/sup/prosup/software/index.html
Rohde & Schwarz URI (1950s) - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: January 30, 2022, 11:09:39 am
content: Since this forum is about test equipment....This week I acquired two R&S URI meters from the mid-1950s. Trying to prevent them from ending up in a mancave of someone who has no idea what these instruments actually are for...Today, I tested them and... Immaculate! All measurement functions work as expected. Little or no reading error. One even came with an HF Taskkopf, a 250MHz active probe with a miniature tube inside. As for a quick first test, also this one seems to work perfectly!Housing is nice too... They come as “Normkasten Größe 35”, and they have feet on the bottom and recessions on the top that makes them stackable. Wish all current half rack size gear was like that ;-)One even came with an HF Taskkopf, a 250MHz active probe with a miniature tube inside. As for a quick first test, also this one seems to work perfectly!
Rigol DP832 dimensions? - Page 1
Forum section: electronics / testgear

author: spiff72
author_rank: Regular Contributor
timestamp: October 13, 2021, 12:20:00 am
content: Hello all,I recently ordered this bench power supply, and in looking at the spec sheet it shows the following for the dimensions:239mm(W) x 157mm(H) x 418mm(D)Can anyone who owns this unit tell me whether these dims include the corner bumpers? 418mm seems surprisingly big for the depth, and I am hoping that it includes the protruding parts of the bumpers! Trying to figure out what I need to do to my bench to make room for it (replacing Agilent E3646A, which I got for cheap off ebay since only Output 2 works correctly - Output1 unstable). The E3646A is roughly 100mm shorter than the 418mm depth shown for the Rigol.Thanks!

author: Caliaxy
author_rank: Frequent Contributor
timestamp: October 13, 2021, 02:47:16 am
content: Yes, the bumper corners are included in those dimensions. My DP832 replaced my HP E3631A, which worked perfectly well (and it was only about 40 mm shorter) but wasn’t able to display more than one channel at a time. It actually complemented it, because I still have the HP (it’s sometimes handy to have a 0-6V/5A output).Don’t forget to upgrade it to 832A

author: spiff72
author_rank: Regular Contributor
timestamp: October 13, 2021, 11:54:58 am
content: Quote from: Caliaxy on October 13, 2021, 02:47:16 amThanks for the reply! Can you tell me the H x W x D with the bumpers excluded?And yes I am planning to upgrade it once it arrives. :-)

author: Caliaxy
author_rank: Frequent Contributor
timestamp: October 13, 2021, 02:32:21 pm
content: About 216mm(W) x 138mm(H) x 380mm(D) plus/minus a few mm (without the binding posts on the front panel)

author: spiff72
author_rank: Regular Contributor
timestamp: October 13, 2021, 03:04:18 pm
content: Quote from: Caliaxy on October 13, 2021, 02:32:21 pmAwesome! Thanks a lot for measuring that for me...

author: adauphin
author_rank: Unknown
timestamp: January 30, 2022, 01:12:32 pm
content: I know this thread is a few months old, but I'm also considering this PSU and depth is a concern. What is the minimum depth required for this to sit on a shelf without the bumpers? This would be from the front feet (pads) to the rear including room needed for the power cord, not overly concerned with the length of the front controls.That being said, can it sit on the shelf without the bumpers? Does it need that clearance on the bottom?Many thanks.
BM 869 & BM 867 picture of main PCB side by side  - Page 1
Forum section: electronics / testgear

author: ovi_mv
author_rank: Unknown
timestamp: April 22, 2013, 12:09:36 pm
content: Here's a picture taken to both BM869 & BM867 side by side, together with another one noted by me.My first feelings are a little bit mixed, regarding the choice of semiconductors, starting with :- 25ppm reference (G version) both versions,- 3±½ digit RMS converter inside BM867,- 1% version (Jxx) of the AD636 RMS converter inside BM869,- the trimpots + mutiturn than make the BM869 potentially vulnerable to decalibration when used constantly in rugged enviromets.Antother details that worried me was the presence of stray solder balls on the PCB and on the components on both DMM's, to be more accurate 3 on BM867 and 1 on BM869As for the rest of the construction my personal speculation is that AD-85 does the analog part of the job and the LCD driving BT chip (that looks to me allot like a TI 430 / 4ch 16bit ADC ) does the AD conversion display driving IR comm handling etc.As for the 500000 counts available on dc my personal speculation (again) is that 20bit oversampling is used.I hope that Dave will get the time to do the teardown of both DMM's and give us his indepth oppinionI cannot say that the multimeter is bad choice, I can really say that it is very good choice when comparing price/performance, still only time will tell if the 25ppm will have a significant impact on accuracy.

author: ddavidebor
author_rank: Super Contributor
timestamp: April 22, 2013, 01:30:20 pm
content: Nice and interesting.

author: KedasProbe
author_rank: Frequent Contributor
timestamp: April 23, 2013, 04:46:08 pm
content: The VR2 is for the ACmV calibration (869 has better specifications)The 3 caps are for calibrating 3 ranges of ACV on 5kHz. The 869 has a higher bandwidth to measure such signals hence the extra calibration.All other calibrations like ACV 50Hz are only done in software for both.

author: Prosiak_wej
author_rank: Newbie
timestamp: January 29, 2022, 04:40:25 pm
content: The small VR1 is for contrast adjust?

author: rob77
author_rank: Super Contributor
timestamp: January 29, 2022, 11:13:32 pm
content: and what exactly is wrong with the choice of semiconductors ?
PC-based scope without dedicated drivers for automated testing - Page 1
Forum section: electronics / testgear

author: jpsecher
author_rank: Newbie
timestamp: January 28, 2022, 02:18:10 pm
content: What is a good PC-based oscilloscope for automatic testing of a device under development? The criteria are: should work without a dedicated driver; should work on Linux, MacOS and Windows; should support a human-readable text-based protocol (preferably SCPI). Apart from that, the specs are not important, since the the scope will just be used to sanity-check low frequency, low voltage signals via BNC. Two channels will probably be enough.

author: Fungus
author_rank: Super Contributor
timestamp: January 28, 2022, 02:31:39 pm
content: Rigol DS1102Z?It also has the advantage of a built-in screen so you can set it up visually.

author: alm
author_rank: Super Contributor
timestamp: January 28, 2022, 03:49:47 pm
content: If a bench scope with SCPI via USB or LAN is not an option, then you might consider a PC-based scope that's supported bySigRok.Or if the requirements are very modest, even a low-end DAQ likeLabJack.

author: LaurentR
author_rank: Frequent Contributor
timestamp: January 28, 2022, 06:47:53 pm
content: If you are looking at inexpensive options, aDigilent Analog Discovery 2has software with a development environment (and also some outputs if you need to control the DUT).Saleae (more of a logic analyzer and less of a scope) also has a decent API.
Crazy ‘scope trigger at low Hz - Page 1
Forum section: electronics / testgear

author: PerranOak
author_rank: Frequent Contributor
timestamp: January 27, 2022, 06:28:50 pm
content: I was investigating a circuit (at a low freq) and the scope would not trigger and display as usually on “auto”. It went into “STOP” or just displayed random, untriggered nonsense.To cut a long story short, I used the sig gen (square wave) and “auto” worked perfectly from higher freq down to 29Hz. However, at 28Hz it failed as above and at all freq below 28Hz.Any idea why please?Scope:Rigol DS1054Z - fully upgradedSig gen settings:Square wave4VppOffset = 0Phase = 0Duty = 50%

author: LazyJack
author_rank: Frequent Contributor
timestamp: January 27, 2022, 06:36:44 pm
content: Yes. 'Auto' trigger mode is not suitable for low frequency triggering. You need 'Normal' mode. Auto mode forces a sweep (acquisition) if there is no trigger for a specific time. If your trigger frequency is lower than the frequency at where auto kicks in, youll get random sweeps.

author: edpalmer42
author_rank: Super Contributor
timestamp: January 27, 2022, 06:48:06 pm
content: Check your owner's manual. But, that sounds fairly normal to me.The Auto trigger mode means that if the scope doesn't see a trigger signal for < this long > it will generate a fake one so that you can still see a trace. The duration of < this long > depends on the scope and may or may not be documented. If your input doesn't generate a trigger signal often enough, Auto trigger gets confused and general weirdness occurs. For inputs like that, switch to Normal trigger mode. You can also check to see if the Auto trigger on your scope is affected by the Trigger Coupling mode (i.e. AC, DC, LfRej, etc.). I don't know if that could be an issue or not.Ed

author: PerranOak
author_rank: Frequent Contributor
timestamp: January 28, 2022, 02:40:57 pm
content: Excellent, thanks both.That seems reasonable; it's just that I thought I was going mad for a minute!
New BUF802 the ultimative DIY Active Probe Opamp?? - Page 1
Forum section: electronics / testgear

author: Noy
author_rank: Frequent Contributor
timestamp: January 28, 2022, 09:32:47 am
content: Hey guys,since some months i planned to do a USB powered / qfn using respin of branadics OPA659 Active Probe design for my Rigol 5k..:http://welecw2000a.sourceforge.net/docs/Hardware/Aktiver_Tastkopf_mit_OPA659.pdfYesterday i read the TI newsletter about the new BUF802:https://www.ti.com/lit/ds/symlink/buf802.pdf?ts=1643347428244&ref_url=https%253A%252F%252Fwww.google.com%252FAnd tought "should i better do a new design with this nice new device (BUF802)"?One thing i cannot really understand is :Should i use it in BF mode or the "pseudo CL" BF mode (Fig:8-11) or in real CL mode..? Do i need the CL mode for an active probe for my needs? Do i care about that DC offset or should i simple only use AC coupled mode of my scope? Or can i simple adjust the dc offset with an external pot before i do a measurment?I want a 350MHz maybe 500MHz active probe to probe RGMII / SDIO Signals.. i think the BW of the scope is enough (for most of my signals) but i have the issue that the passive probes aren't high impedance enough with >100MHz signals which will result in more blurred signal integrity.. thats why i want an DIY active probe..Which precesion opamp should i use if i want go the CL way? The suggested OPA140A or are there any better Opamp (which are availabel currently.. ;-))

author: mawyatt
author_rank: Super Contributor
timestamp: January 28, 2022, 02:08:12 pm
content: That's a nifty new IC, thanks for pointing to thisFor just a Hi Z probe for higher frequency use, the BF should suffice since you can just AC couple the output. Think CL mode would be for something like a scope front end where you want to cover very low frequencies and DC, but for a probe this is likely not required.Best,
Looking for DC electronic load 500V - BK 8502B vs Itech IT8512B+, others - Page 1
Forum section: electronics / testgear

author: electr_peter
author_rank: Unknown
timestamp: January 26, 2022, 08:58:10 pm
content: Looking for used/new DC loads capable of >350-500VDC, 10-20A current and 150-400W power. The top brands may be considered if used.Both BK Precision 8502B and Itech IT8512B+ offer 500V/15A/300W and look exactly the same (same screen, buttons, layout, specs). Itech also offers lower power IT8511B+ (500V/10A/150W).Are BK and Itech loads exactly the same internally? Is this a re-branding thing? Some Maynuo loads also look similar externally for other models, but I am not sure how BK Precision/Itech/Maynuo compare in terms of quality.Itech is sold on AliExpress, not many stores stock it otherwise. Is there a known fakes of this brand? Non-fake unit would be appreciated.Some lesser known models from east Asia like ET5411, Kunkin KL5105, Tonghui TH8411 pop-ups in search. These are unknown to me in HV aspect.What are other options for higher voltage DC load?

author: MarkL
author_rank: Unknown
timestamp: January 26, 2022, 10:08:29 pm
content: The Array 3724A is rated 20A / 500V / 250W. I have a couple of the lower voltage Array 3723A with the GPIB option for several years now and they work quite well.http://www.array.sh/yq-3721e.htm

author: Jester
author_rank: Frequent Contributor
timestamp: January 26, 2022, 11:08:58 pm
content: EastTester ET5411 500V, 15A

author: bicycleguy
author_rank: Frequent Contributor
timestamp: January 27, 2022, 12:02:26 am
content: This looked nice but he never finished review:https://www.eevblog.com/forum/testgear/beich-ch9720cu-electronic-load-review/msg3547318/#msg3547318

author: electr_peter
author_rank: Unknown
timestamp: January 27, 2022, 03:09:38 pm
content: Array 3724A and EastTester ET5411 are suitable. Beich unit goes to only ~360V, 500V would be better.Currently leaning towards ET5411 as it seems to work (based on EEVblog), cost is on the lower end and there are few sources. Other units are more difficult to source.
Bench LCR Meter Differences ET–4410 & ET–4510? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: January 26, 2022, 08:07:16 pm
content: Hi!A forthcoming payment of backdated salary means I have funds to consider one of those colour TFT bench LCR meters – yes, I know everyone raves about the DE5000, unfortunately issues with my eyesight render LCDs difficult to see because of contrast problems !Of the bench mains–operated ET–4410 and ET–4510, can anyone summarise the difference between the two versions? – the ET–4510 is about £60 more expensive!Anybody any experience of these bench–type mains powered units?Chris Williams

author: Martin72
author_rank: Super Contributor
timestamp: January 26, 2022, 10:29:02 pm
content: Hi,Funny thing, yesterday I´ve spotted the 4410 for the first time...Wasn´t aware of the 45-series, until now.The only 2 differences I can see so far:4410 got several testfrequencies in fixed steps, the 4510 got continously adjustable frequencies in 1Hz steps.Same with the testlevel, 4410 several in fixed steps, 4510 continously in 1mV steps.Martin
Omega HHM31 Multimeter Repair - Page 1
Forum section: electronics / testgear

author: iblackford
author_rank: Contributor
timestamp: January 26, 2022, 05:54:02 am
content: Hi All,If my posts so far haven't given it away, I'm working through getting some of my old DMM's functional again. I've got a cosmetically nice HHM31 that is having issues.This meter uses the UM7108F, but I haven't been able to find any schematics for it, only datasheets for the individual parts.Symptoms:-Ohms mode doesn't register or is way way off. Unusable.-Volts mode, if I put in ~12V on the 20V setting, I get a reading of about -19V. If I keep increasing the voltage, the display voltage actually goes down to -17V, -16V, etc...Things I have checked:The UM7108F only has one differential ADC input, so all preconditioning and mode selection needs to be sorted before going into the ADC inputs.1) VREF is ~86mV. Datasheet says this should be 100mV, so it's a bit off. I can adjust it with a pot nearby, but I never achieve 100mV when adjusting it.2) Vin(differential) is ~-.169V when inputing ~12V, and it tracks down to -.1593V as I increase the voltage to ~15V (this behaviour seems to track the LCD behaviour)3) Vin- and Vin+ on the UM7108 have 100k in series on their inputs. There is no voltage drop across these resistors, suggesting that the ADC inputs are not leaky.I could spin my wheels and check other things, but I'd love some guidance on what to check next. Schematics would be greatly appreciated also!This is an ok meter when it's working, and I'd like to get it back that way!Thanks, Ivan

author: Tjuurko
author_rank: Regular Contributor
timestamp: January 26, 2022, 09:00:34 am
content: Measure the voltage of the built-in voltage reference: "V+" (pin 9) to "Analog Common" (pin 46).Must be 3±0.2 V.

author: iblackford
author_rank: Contributor
timestamp: January 26, 2022, 01:56:10 pm
content: I checked it, that's 2.940V. On the Datasheet this is listed as the supply voltage, not a Vref, does that sound right?Thanks, Ivan

author: iblackford
author_rank: Contributor
timestamp: January 26, 2022, 06:05:01 pm
content: After doing a little more sluething, I found an analog switch, a CD4053, had gone leaky on the channel that was feeding the ADC:manually bridging the channel restores normal operation! Now I just have to get that part on order and i have a working meter again!Thanks, Ivan
Plutosdr and its bandwidth - Page 1
Forum section: electronics / testgear

author: xugmu
author_rank: Contributor
timestamp: January 27, 2022, 03:09:44 pm
content: Could someone tell me how much bandwidth the pluto sdr is really capable of transmitting?I am trying to transmit and from 4 or 5 Mhz it transmits intermittently. I do not understand why an SDR that theoretically reaches 65 Mhz does not go beyond thatBest Regards

author: ch_scr
author_rank: Frequent Contributor
timestamp: January 27, 2022, 03:23:38 pm
content: The limit is the USB2.0 connection to the PC. IF you can put your data generation into the FPGA, the bandwidth will be as expected.

author: xugmu
author_rank: Contributor
timestamp: January 27, 2022, 03:32:24 pm
content: Hackrf transmits without problems 10 Mhz and only consumes, if I remember correctly ,4MB in the usb2 port.Plutosdr should consume 8MB. Until now, I have not been able to transmit with that bandwidth for more than 1 secondI don't think the 512 MB of internal memory will do much with 10Mhz at 16 bits. Much less with 65 Mhz

author: ch_scr
author_rank: Frequent Contributor
timestamp: January 28, 2022, 07:50:03 am
content: Quote from: xugmu on January 27, 2022, 03:32:24 pmMy thinking was along the lines of "pseudo-random bitstream generation + modulation of choice in fpga" so you could get at least full bandwidth test stream out of it.I think limitation is in libiio protocol (lots of overhead). I'm pretty sure I've seen a firmware on github mentioning that and implementing receive-only with hackrf protocol, reaching at least 8MSPS via USB.But I can't find it anymore

author: nctnico
author_rank: Super Contributor
timestamp: January 28, 2022, 05:21:06 pm
content: Quote from: xugmu on January 27, 2022, 03:09:44 pmYou'll have to program the FPGA with custom software in order to get high bandwidths. The Pluto SDR supports USB2.0 only which isn't good enough. Typically you are streaming two 16 bit I and Q signals from/to an SDR so you'll quickly need USB3 bandwidths to cope with that amount of data. Ettus has several devices which support USB3 and with those you can achieve higher bandwidths.
Voltech DC1000 DCI bias supply: Interlock pinout/description - Page 1
Forum section: electronics / testgear

author: nexus
author_rank: Regular Contributor
timestamp: January 29, 2022, 04:44:28 am
content: Hi all,Picked up an interesting bit of kit; a Voltech DC1000 DCI bias source. This is a unique DC current source designed for biasing components undergoing an AC LCR measurement. It has a high input impedance and some other tricks to minimize draining current from the LCR meter also in circuit with the DUT, so that you can make accurate LCR measurements with a bias of up to 25 amps on your DUT. Helpful for designing/characterizing magnetics of course.Now this thing has a mandatory interlock circuit which must be operated to get any output. When you buy it new, it comes with an interlock bypass plug. Since I just got this one used on eBay, no accessories are included. The manual unfortinately does not provide a functional description of the pinout for the interlock. The interlock input is a DB9 connector on the back. Here is a link to the manual online:https://www.transcat.com/media/pdf/Voltech-DC1000-User-Manual.pdfDoes anyone have the info on a pinout and/or guide for operating the interlock on this thing? I've reached out to Voltech but I figured I'd also ask here.Full teardown of this box coming soon.Cheers,Kevin
Keysight DSOX1200G: unusually powerful CAN training signal - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: January 25, 2022, 08:11:51 am
content: Hi,The Keysight DSOX1200G series oscilloscopes may not always get as much love as other makes (which is understandable).Yet, they have one useful (but not really extensively documented) feature that I wish to share with those that are not aware of it. It’s the extensive set of training signals, and in particular, the CAN serial bus training signal.Typically, if oscilloscopes can send out CAN training signals (some cannot), they simply send repeatedly out the same simple message with their own name. Also, decoding these signals typically results in observing a lot of NACK errors unless a properly configured receiver circuit is connected while measuring.Not the DSOX. It sends out a long training sequence (16 messages) that includes short (11 bit) and long (29 bit) ID, data and remote packets, and varying message lengths (1, 4, 5 and 8 bytes). Quasi randomly inserted over training sequences there are a variety of different errors (CRC error, bit stuffing error, NACK), very suitable for testing serial decoders. Apart from frames where a NACK error is deliberately inserted, the ACK is already added (unlike most demo/training CAN signals on other oscilloscopes).While a couple of simple developer boards (like two ARDUINO MKR series), each equipped with a CAN shield, would you allow to quite flexibly do most of the above too, this cannot create the error signals as created by the DSOX.PS Tip: because it's a rich sequency, you will want to trigger it properly to a stead point. To do sone, you can trigger on a data frame with ID = 0x7F and first data byte 0xE4 and set trigger holdoff to 35ms.
Importing an oscilloscope into the USA - Any tips or advice? - Page 1
Forum section: electronics / testgear

author: salvagedcircuitry
author_rank: Regular Contributor
timestamp: January 25, 2022, 08:34:52 pm
content: I am aware of the export regulations on oscilloscopes out of the USA, but are there similar regulations about importing an oscilloscope into the usa?I am interested in purchasing a 4ghz oscilloscope from Alltest in israel, but I am concerned that it may get stuck in customs.Is there anything I should know in advance before proceeding?Is it worth the hassle to buy an oscilloscope from overseas to import to the USA?The entire transaction is going through ebay, so I am covered regardless, but I just dont want to find out that it's going to take 3 months and get impounded by customs for me to never see again.Has anyone tried doing this?Thanks!

author: dorkshoei
author_rank: Frequent Contributor
timestamp: January 25, 2022, 08:47:32 pm
content: De Minimis Value is $800 per person. supposedly per day but no clue if they can track this.anyways, if item value exceeds $800 you will absolutely be charged duty and worse a broker/handling fee by Fedex/UPS etc. I'm not sure if USPS charges brokerage fees.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: January 25, 2022, 11:52:00 pm
content: Doesn't look like there is an import duty:https://hts.usitc.gov/?query=9030.20.10
Fluke D800, weird LCD artifact - Page 1
Forum section: electronics / testgear

author: iblackford
author_rank: Contributor
timestamp: January 25, 2022, 06:52:15 pm
content: Hi all,I'm trying to revive an old piece of test equipment. I have a Fluke D800 (similar to the 8020A in general appearance, but without a cap checking feature?)It has some severe bleeding on the LCD when operated from a 9V battery, or at full power through the DC jack:However, if I input ~3V into the DC jack instead of using the battery, the display can look almost normal,except that the low battery symbol is also present:This meter uses the original intersil 429100, from which the ICL7106/7107 were derived. It drives the LCD panel directly from this IC. Any ideas on what the issues could be? If I do have a bad 429100, can I replace it with an ICL7106? The ICL7106 is more available.Thanks, Ivan
Siglent SDS 1202X-E Auto marker set - Page 1
Forum section: electronics / testgear

author: Alex_Sharp
author_rank: Newbie
timestamp: January 25, 2022, 06:16:05 pm
content: Hi... Is it possible to set auto marker in any way that can by done on SDS1104.Can not find any similar on my SDS1202X-EThank youAlex LY4SA
Easter egg on an Agilent PSG board <3 - Page 1
Forum section: electronics / testgear

author: nexus
author_rank: Regular Contributor
timestamp: January 25, 2022, 03:42:56 am
content: Was poking around a PSG that has a bug I need to track down. Saw this on one of the boards, hehe. <3Its a 2012 model year instrument, Agilent branded. I wonder if the KS people do stuff like this, or any of the other TE vendors still.I remember seeing killroy inside of a hybrid microwave amplifier that was torn down on the Signal Path:https://youtu.be/eUpxhZ0UEt4?t=2323(at around 38:38)

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: January 25, 2022, 04:59:09 am
content: Yep! Still happens if you know where to look. In software/firmware, too.

author: nexus
author_rank: Regular Contributor
timestamp: January 25, 2022, 05:55:20 am
content: Quote from: Keysight DanielBogdanoff on January 25, 2022, 04:59:09 amI am pleased that the tradition is still embraced! Will have to peek inside more instruments.Of course, if you would like to send one in for an easter egg hunt that would also be fun!
OWON HDS272S mishap  - Page 1
Forum section: electronics / testgear

author: eti
author_rank: Super Contributor
timestamp: January 24, 2022, 10:27:38 am
content: Do you think the waveform generator of my OWON HDS272S has input protection?!I accidentally hooked up 12VDC to the waveform (function) gen socket.... PSU was limited to 1A - heard a faint click, and on subsequent connections (mistake of course) but it still outputs just fine!

author: Grandchuck
author_rank: Super Contributor
timestamp: January 24, 2022, 12:48:39 pm
content: Does the output amplitude decrease when loaded? If the output impedance is 50 ohms, it should be able to supply half the amplitude to a 50 ohm load. That would be a test you could make.

author: eti
author_rank: Super Contributor
timestamp: January 24, 2022, 09:03:53 pm
content: Quote from: Grandchuck on January 24, 2022, 12:48:39 pmThanks. It seems fine - here's a 47R connected across the waveform gen (I'll call it func gen!): Purple trace = loaded, Yellow trace = open circuit

author: Grandchuck
author_rank: Super Contributor
timestamp: January 24, 2022, 09:18:22 pm
content: Looks good. The generator is probably OK

author: eti
author_rank: Super Contributor
timestamp: January 25, 2022, 02:18:55 am
content: Quote from: Grandchuck on January 24, 2022, 09:18:22 pmPhew. I thought I’d maybe damaged my new scope 😂Note to self: quadruple check ALL connections when doing late night tests.
Looking for info on Macrodyne ERDAC 1100 Digitizer - Page 1
Forum section: electronics / testgear

author: VintageTekFan
author_rank: Regular Contributor
timestamp: January 24, 2022, 05:11:49 pm
content: I have a Macrodyne ERDAC 1100 transient digitizer, that I'm trying to find any information on. This seems to be from a small manufacturer in North America from the 70s-early 80s timeframe.It is a single channel digitizer, has approximately 20MHz bandwidth, a 10-100kHz digitizing rate, and between 1K to 16K words of memory depth. I'd love to get a service manual for it, but anything would be helpful. I'd like to try and clean it up and get it working. Pictures will be added once I get it cleaned up a bit.
SDG6022X or SDG2122X or something else ? - Page 1
Forum section: electronics / testgear

author: nutron
author_rank: Newbie
timestamp: January 20, 2022, 06:05:16 pm
content: Hi guys.I have been looking into buying a function generator for a while now.I have to mention that it would be my first function generator i own, I have used other function generators in the past that are more than 20 years old.I am looking for a good general purpose function generator. I am not specialized in any specific field.I am not into RF at all.My two candidates are the SDG6022X and SDG2122X.My problem is that a bunch of functions of the 6000 series are pretty useless for me , i don't foresee myself ever doing anything offered by the IQ modulation.Looking at the datasheet , the symbol rate and carrier frequency makes me wonder if the IQ section of the 6000 series is more of a gimmick than a seriousfunction generator for advanced modulation techniques.Correct me if am wrong though , i am no expert in that field.On the other hand the 6000 series can do square wave up to 80MHz where as the 2000 series can do only up to 25MHz. That would make the 6000 series a more suitable clock source.The other advantage of the 6000 series vs. 2000 series are the faster edge rise and fall times of the 6000 series.What kind of engineer / technician / hobbyist should go for the 6000 series and and what kind should go with the 2000 series ?Please let me know what you guys think of the 2000 series vs the 6000 series.

author: tautech
author_rank: Super Contributor
timestamp: January 24, 2022, 12:10:11 pm
content: Apart from IQ and max frequency they are very similar AWG's although the 6kX also has a faster sample rate and longer memory.The SDG2kX range as you know provide a max of 120 MHz whereas 6kX is 500 MHz and as both this series can beenhancedSDS2042X and SDG6022X are the popular sellers.IQ for 6kX is a $670 option not included in the base price.https://siglentna.com/product/sdg-6000x-iq-signal-generator-function/Now if 60 MHz is fast enough for your clock requirements and you also want/need faster edges consider the SDG1062X however these are only 14 bit.

author: nctnico
author_rank: Super Contributor
timestamp: January 24, 2022, 02:44:20 pm
content: If you have the money: go for the Tektronix AFG31000 series and don't look back. You'll have a much better user experience. Siglent SDG2k series is nice but lacks versatility in some areas and has issues when synchronised to an external reference (depending on firmware version).I went through quite a few signal generator options:https://www.eevblog.com/forum/testgear/tektronix-afg31022-review/
Keysight BenchVue Oscilloscope to log data over long interval? - Page 1
Forum section: electronics / testgear

author: jusaca
author_rank: Unknown
timestamp: January 20, 2022, 09:46:55 am
content: I want to use my Keysight 1000X in combination with a current clamp to monitor a slowly changing current over a few hours. The maximum time scale on the scope itself is 50s.I just got a demo licence for Keysights BenchVue Oscilloscope, because I figured I could use that for just logging the scope data away on the computer, just like I would do with a multimeter over serial port.But after playing around the whole morning I get the suspicion that it might not be that easy?I have the possibility to "trace data" and can set a logging interval and some "requested points" (I'm not sure if that means data samples per screen capture or what...?).But when I set the logging interval to e.g. 1s, it seems to take one complete screen capture every second, not one measurement every second. And although I try to export all of these captures as one long measurement, the export results just in a lot of individual excel sheets, one per screen capture...Is there a way to simply log the data from the scope with a low time resolution (like 1 sample per second) as a continues datastream? If the software would even show some kind of liveview that would be best, but is not a necessity.PS: I know, with these slow and long measurements it would probably be easiest to simply use a multimeter with serial/USB output, but I currently do not have a multimeter with logging capability at hand.

author: Someone
author_rank: Super Contributor
timestamp: January 20, 2022, 10:32:50 am
content: Such "cheap" scopes can be used for all sorts of creative uses like that.Set to roll mode, and turn on a measurement of the parameter you want to log. Then have a computer poll that measurement value over visa. No need to fidget with run/stop cycles and waveforms.It won't be super accurately time aligned, but it'll do the job.

author: jusaca
author_rank: Unknown
timestamp: January 23, 2022, 11:49:20 am
content: Yes, that is what I ended up doing.It took me some time to find a document with all the SCPI commands for the scope, but it was actually linked in the web interface of the scope itself...
SDG2000X - Single sweep with final constant frequency - Page 1
Forum section: electronics / testgear

author: drDuesentrieb
author_rank: Newbie
timestamp: January 22, 2022, 04:50:14 pm
content: Hello, first post in this forum after some time of reading and learning.I am looking for a way to teach my SDG2042x performing a single sweep or ramp-up and keeping the final frequency.It should be some kind of a single cycle sweep burst with clamped stop-frequency.The application is similar to a common stepper motor control which uses the STEP-Input for a single step. The goal is to have adefined speed-up of the motor. Translated to the the signal which I have in mind, it can be separated into three steps:1. Square-wave (e.q. 50 %) starting at 0 Hz2. Sweep/Ramp-up to e.g. 1 kHz3. Maintain e.g. 1 kHzIdeally this is triggered manually or by the external trigger.If I use the square-wave + sweep of the SDG (and set the trigger to manual), it will fall back to the "Start Freq" after reaching the "Stop-Freq".Single repetition of an Arb-Waveform behaves similarly.Other combinations of wave + modulation also didn't work for me.Now I am thinking of combining the two channels (e.g. CH1 doing the sweep, CH2 set to the final frequency with the delay defined by the sweep time), but this seems a bit complicated for this simple task.Any hints in the right direction?

author: cesare
author_rank: Contributor
timestamp: January 22, 2022, 05:04:43 pm
content: As the bandwidth and frequency lie within the audio range, my goto for these sorts of signals is to generate them programmatically, or in an audio editor (e.g. Audacity, or my editor of choice, RX), then replay them through an audio DAC. Now my bench has computers as part of my test equipment, so this is easy enough for me, and I have a dedicated cheap 4 channel audio interface for generating such signals. This relies on you being ok with the square wave to be bandlimited to, say, 22Khz or whatever your nyquist is.

author: nctnico
author_rank: Super Contributor
timestamp: January 22, 2022, 05:15:25 pm
content: This is a piece of cake on a waveform generator which supports sequences where the final waveform is build from smaller chunks of waveforms. One chunk would be the sweep and the other the fixed frequency (which is repeated infinitely).Alternatively you need a generator with more sweep controls. On my Tektronix AFG31000 I can set the sweep time, hold time (time it stays at the stop frequency) and return time (reverse sweep). Maybe other Tektronix units which are more budget friendly on the used market can be found which support the same settings.All in all I don't see how you can achieve your goal with the SDG2024; changing the frequency through remote control likely introduces a large disturbance in the output.

author: SilverSolder
author_rank: Super Contributor
timestamp: January 22, 2022, 06:42:30 pm
content: Some old school signal generators work the way you describe, e.g. the hp 3325A will sweep from start to stop, and remain at the stop frequency.There are probably newer / more compact models around that still work the same way?
HP 58503A GPSDO Firmware Rev. E - Page 1
Forum section: electronics / testgear

author: maurit
author_rank: Contributor
timestamp: January 26, 2022, 11:12:42 am
content: Good morning,I am interested in the Firmware Rev.E for the ROMs AM29F010-120JI (U11 / 2L, U12 / 1L, U13 / 2M, U14 / 1M) of my HP 58503A.On the net I only found Rev. AIf anyone has a copy (.BIN) it will be very welcome.Thank you.maurizio
Anyone in the Brisbane area willing to show me their setup ? - Page 1
Forum section: electronics / testgear

author: swmcl
author_rank: Contributor
timestamp: January 22, 2022, 04:48:36 am
content: Hi,Thinking of buying equipment for a pre-compliance test setup perhaps with Rigol RSA-3015N for small electronics modules. I am not familiar with how best to go about it and would love to see someone's setup before jumping into any purchase.Rgds,Steve
Signal Generators recommendations - Page 1
Forum section: electronics / testgear

author: Isync902
author_rank: Newbie
timestamp: January 21, 2022, 02:06:59 pm
content: Hello, I could not find this on the forum so I'll post my question here, If anyone knows a good thread on this topic, please link me to the thread on this discussion.I want to buy a Signal Generator for under $ 200 , In Canada. Is there any good recommendations? This is so I can tune Radios.

author: Fungus
author_rank: Super Contributor
timestamp: January 21, 2022, 02:19:36 pm
content: https://www.eevblog.com/forum/testgear/uni-t-utg932utg962-200msas-function-arbitrary-waveform-generator-220394/
Voice Control for Testgear (speech to scpi ? ) with PC, mic (sepia FW)? - Page 1
Forum section: electronics / testgear

author: Noy
author_rank: Frequent Contributor
timestamp: January 21, 2022, 01:37:19 pm
content: Hi,does somebody know if someone already tried a "voice control" for test gear with a normal PC / Webcam?I know the "olli" projecthttps://github.com/jmwilson/olliebut snips is closed now and you need a "faster" raspberry (3 and higher, not available nowadays, extra stuff on your bench etc..) for this..So my thinking was now many people have already connected their testgear over LXI ,GPIB, USB (serial) to their PC/Notebook.And many people are using nowadys (thx covid..) webcams / headphones / microphones connected to their PCs.And today it looks like there is an alternative way for local speech control with the SEPIA framework?Did somebody already tried to control his connected testgear with his PC with SEPIA framework (or other free, local alternatives)?Unfortunally i don't have much software expierience beside small uc and some lowlevel embedded linux stuff...Maybe a community work?The idea is to run the sepia framework on your local pc (win/linux) with a webcam / headphone / microphone connected and the needed than the correct LXI / GBIP / USB serial comport ist opened and the scpi commands are send there..? Any hints?Maybe we can reuse the "olli" work for the already made testgear there?Found something which was called "bitvoicer" looks like this was the thing i'm looking for. Unfortunally it looks like its already closed...My intention is primary to tell my rigol scope to retrigger / restart "single" mode...Currently i have to hold the probes with my hands (if i'm using gnd springs to prevent gnd ringing.. and i wouldn't solder wires to 0402 or 0,5mm RM parts for testing..) the probes and shout out for my wife to get her fingers additionally to press the "single knob"...EDIT: Found something interesting:https://github.com/patricksebastien/speech2scpihttps://www.workinprogress.ca/software/speech2scpi/unfortunally only linux...
Retrofitting tracking generator in  Rohde & Schwarz  FSEM Spectrum analyzer - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: January 26, 2022, 06:21:36 pm
content: Hello,I hvae access to a tracking generator kit for the Rohde & Schwarz FSE spectrum analyzers (cables, board and attenuator) , if it possible to retrofit that without an option code?Thnaks

author: xmo
author_rank: Regular Contributor
timestamp: January 26, 2022, 07:31:51 pm
content: It will probably work fine. I put one in an FSP with no problems. The nice thing is that the TG cal data is on the card.

author: hafrse
author_rank: Regular Contributor
timestamp: January 26, 2022, 07:34:46 pm
content: Quote from: xmo on January 26, 2022, 07:31:51 pmCorrect, I checked, it is a hardware option B10 (TG 7GHz) and should work without any software key. I think most of the HW options are plug and ply, cal values in the module ifself.
Kontron Computing Multimeter DMM 4040 Manual ? - Page 1
Forum section: electronics / testgear

author: shempe
author_rank: Contributor
timestamp: February 14, 2016, 03:56:30 pm
content: Long time ago, I bought this DMM and since then, I am searching for a manual or better a service manual.I phoned around in Germany but no luck so far.I searched the usual shops for a manual also no luck.Maybe someone can help me out.

author: TiN
author_rank: Super Contributor
timestamp: February 14, 2016, 04:28:39 pm
content: Guard terminal? External reference option? This is interesting meter. Open it up and let's see how it works

author: shempe
author_rank: Contributor
timestamp: February 14, 2016, 06:46:27 pm
content: I think it is nothing special on this Meter, but who knows without manual or spec´s?Here we go, a quick peek inside.Analog Board.Digital Board.Back Side.

author: nidlaX
author_rank: Frequent Contributor
timestamp: February 15, 2016, 03:36:44 am
content: Is that a Caddock network near the bottom left on the analog board? These layouts are so dense, I can't pick out the reference.

author: shempe
author_rank: Contributor
timestamp: February 15, 2016, 09:02:30 am
content: Yep it is a Caddock.and here, I think the Ref + 4 1/2 A/D4 1/2 A/D for a 5 1/2 Meter ??

author: hoppppla
author_rank: Newbie
timestamp: January 20, 2022, 09:59:52 pm
content: Hi,did you make any progress the last years? I have stumbled across a defectiv DMM4040 recently and now I'm looking for schematics etc. but there seems to be nothing available.best regards, Hermann
Rigol MSO5074 with 200 euro discount for as long as it lasts - Page 1
Forum section: electronics / testgear

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 08, 2021, 03:16:43 pm
content: Hi every one.For the buyers in Europe check out eleshop.eu they have the Rigol MSO5074 for 850 euro including tax. It is a special offer for as long as the stock lasts. You have to search for it in the search bar.I got mine a few days ago.

author: Vincentd
author_rank: Newbie
timestamp: February 08, 2021, 08:22:14 pm
content: Awesome tip! Unfortunately it’s a bit out of my budget

author: nctnico
author_rank: Super Contributor
timestamp: February 08, 2021, 08:42:41 pm
content: That is incredibly cheap. What is interesting though is that this promotion (seemingly including the protocol decoding option for free) is running from November 2020. Either they have a huge amount of these scopes in stock or nobody is buying them.

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 09, 2021, 07:24:08 am
content: The stock was out near the end of January and restocked at the beginning of February. After this has finished the offer will end they told me. And indeed it is a very good offer.

author: S. Petrukhin
author_rank: Super Contributor
timestamp: February 11, 2021, 07:45:31 am
content: In Russia, it costs the same amount without discounts.

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 11, 2021, 06:12:54 pm
content: I checked their site and it seems they sold the remainder of the stock. It is back to it's original price and out of stock. The free software bundle is still on. (but not needed if you use the hack that can be found in this forum)

author: S. Petrukhin
author_rank: Super Contributor
timestamp: February 11, 2021, 08:37:06 pm
content: Quote from: pcprogrammer on February 11, 2021, 06:12:54 pmThe сhinese comrades are officially extending the campaign for the free distribution of a package of all options, except for increasing the frequency and memory depth, over and over again. I think it will never stop.

author: kirostan
author_rank: Newbie
timestamp: January 17, 2022, 12:33:37 pm
content: thank you for sharing the information

author: MegaVolt
author_rank: Frequent Contributor
timestamp: January 20, 2022, 02:16:03 pm
content: Quote from: S. Petrukhin on February 11, 2021, 07:45:31 amTell me a seller's link?

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 20, 2022, 07:20:49 pm
content: Quote from: MegaVolt on January 20, 2022, 02:16:03 pmI bought this model from this supplier a couple of years ago for 81 thousand rubles:https://supereyes.ru/catalog/oscilloscopes_digital/rigol_mso5074/