hybridfree/eevblog-posts huggingface dataset:
Siglent Technologies SHS810X Big Range in Prices - Page 1
Forum section: electronics / testgear

author: NY2KW
author_rank: Regular Contributor
timestamp: February 02, 2024, 04:25:42 pm
content: I see many sellers on Ebay are selling these new for more than 40% discount compared to well-know commercial sellers. Are these grey market, no USA warranty?

author: tautech
author_rank: Super Contributor
timestamp: February 02, 2024, 07:48:33 pm
content: Well there are several SDS800X HD models, 6 in fact. 70-200 MHz, 2 and 4ch models.They are yet to be released to the west.SHS810X RRP is $ 849

author: Martin72
author_rank: Super Contributor
timestamp: February 02, 2024, 08:10:29 pm
content: Wrong thread Rob...

author: Martin72
author_rank: Super Contributor
timestamp: February 02, 2024, 09:24:12 pm
content: Hi,As Rob has already pointed out, $886 is the regular price, so the one offer for $750 can be considered cheap.All others who want between 1300....1500$ are usurers.

author: modoran
author_rank: Regular Contributor
timestamp: February 03, 2024, 07:40:12 am
content: Ebay prices does not include VAT or other taxes, so the actual price is much higher.
Fnirsi-1014d: function gen, square wave  - Page 1
Forum section: electronics / testgear

author: DiTBho
author_rank: Super Contributor
timestamp: January 27, 2024, 01:47:13 pm
content: hiI see the Fnirsi-1014d comes with a built-in function generator.For a very simple application, I don't need nothing but a portable device on battery with one analog line within audio bandwidth, and the possibility to generate a square wave at { 10Khz, 20Khz, ... 100Khz }, with variable duty cycle from 1% to 99%, and an output signal from 0v to 5V.Is the built-in function generator able to do that?I probably downloaded an introductory manual instead of the actual User Manual, but I can't find any more specifics about it

author: naiclub
author_rank: Regular Contributor
timestamp: January 27, 2024, 05:24:01 pm
content: Quote from: DiTBho on January 27, 2024, 01:47:13 pmLike this and what I want I happen to have this model but it doesn't work well at all. The signal generator function is very weak and cannot be used with some scopes.

author: pcprogrammer
author_rank: Super Contributor
timestamp: February 02, 2024, 07:49:26 am
content: All I can tell about the 1014D function generator is that it uses a FPGA and an eight bit 2R/R network to generate the waveform. The schematics can be foundhere.In the FPGA it uses 1KB of memory for the waveform generation, and it uses an external clock synthesizer to set the frequency. Only partially reverse engineered both the FPGA and the firmware.Never really used it, so don't know if it is possible to upload your own waveform. Doing PWM is probably more difficult to do with it and might require constantly uploading a new waveform.The output voltage is dependent on the waveform. The DAC has a fixed amplification and a max output of 3.3V.Just like a lot of the other FNIRSI stuff it is a bunch of crap.
Connecting Agilent U1253A Multimeter to Arduino via IR Port - Page 1
Forum section: electronics / testgear

author: serco
author_rank: Newbie
timestamp: February 04, 2024, 12:00:55 am
content: Hello everyone,I'm currently working on a project where I need to interface an Agilent U1253A multimeter with an Arduino using its IR port. I've been searching for resources or examples online, but haven't found much information on this specific task.I was wondering if anyone here has any experience or tips on how to achieve this connection.Any help or pointers would be greatly appreciated. Thank you in advance!

author: DavidAlfa
author_rank: Super Contributor
timestamp: February 04, 2024, 12:09:35 am
content: https://sigrok.org/wiki/Agilent_U12xxx_series

author: serco
author_rank: Newbie
timestamp: February 04, 2024, 08:18:49 am
content: Thank you for sharing the protocol description.Unfortunately, I won't be able to use a standard adapter since the USB port on the multimeter will be occupied by my computer for control purposes. Instead, I'll need to interface with the multimeter using the input and output pins on the Arduino.If anyone has experience with creating a DIY adapter or could provide a schematic for connecting the multimeter to the Arduino using the input and output pins, I would be very grateful.Thank you again

author: DavidAlfa
author_rank: Super Contributor
timestamp: February 04, 2024, 09:55:43 am
content: You only need to make the IR interface and connect it to the serial port in the Arduino.It seems to use plain serial through a IR diode and phototransistor:https://www.eevblog.com/forum/microcontrollers/8-bit-78k0-d78f0547-help-with-firmware-modification/msg5289082/#msg5289082This might help:https://www.eevblog.com/forum/testgear/fluke-87iv-please-whisper-in-my-ir-p/
Radio frequency generators, why "pulse option" is needed? - Page 1
Forum section: electronics / testgear

author: fk0
author_rank: Newbie
timestamp: February 01, 2024, 08:04:04 am
content: Some frequency generators has "pulse option", when radio frequency can be generated in bursts with configured pulse length from tens of nanoseconds. What is reason for existing such mode, why it can be useful?I suppose, that such mode can be useful in some setups for some form of measurements, but which exact? Moreover, how "pulse option" can be useful if generator has neither external trigger input, nor trigger output (for spectrum analyzer, etc...) So generation of pulses cannot be synchronized with other equipment.Also, frequently generators has the option to modulate (AM or ON/OFF keying) radio frequency with low (audio) frequency. So radio frequency can be modulated with square wave by ON/OFF keying. Why such type of modulation cannot be used instead of "pulse option"?How generator with "pulse option" can be useful for amateur ham radio practice?

author: jonpaul
author_rank: Super Contributor
timestamp: February 01, 2024, 11:12:56 am
content: burst testingradar modulationnot intened for Amateur Radioj

author: czorgormez
author_rank: Contributor
timestamp: February 01, 2024, 11:52:41 am
content: tdr - time domain reflectometry

author: David Hess
author_rank: Super Contributor
timestamp: February 02, 2024, 12:08:49 am
content: Power measurements often cannot be made continuously because of power dissipation limitations, so a pulsed RF signal is used instead, which is essentially the same as a radar application.
Measure jitter on Oscilloscope - Page 1
Forum section: electronics / testgear

author: BaNaN85
author_rank: Newbie
timestamp: February 01, 2024, 10:26:29 pm
content: Hi,I need help with finding out a program function for measuring pulse jitter using a Rigol DHO800/900 series scope.And present it with a measurement value of some sort, that the SCPI programming can spit out to the computer.The measurement I wanna do is quite simple to do manually in persistence mode.Checking pulse jitter of a positive signal CH1 compared to Trigger signal CH4 generated from a trigg generator. (5V pulse trig signal, 100hz)The jitter I expect is somewhere around 5ns.I would like to have it presented like a standard deviation, just a value I could print out.If the DHO800/900 can't do it, I might need another scope that can.Best regard

author: Bud
author_rank: Super Contributor
timestamp: February 02, 2024, 12:19:34 am
content: Before doing any of that you must know the jitter of your oscilloscope , and it has to be better than the estimated jitter of the test device, otherwise what you will measure may be misleading, i.e. instead of measuring jitter of the test device you will be measuring jitter of your oscilloscope, depending whose jitter is better.
what is the most common durometer for soft equipment features? - Page 1
Forum section: electronics / testgear

author: coppercone2
author_rank: Super Contributor
timestamp: May 06, 2022, 03:41:37 pm
content: Has anyone measured the durometer of something like a fluke multimeter/scopemeter case or a HP bump guard (rubber bezel on the half rack instruments) or something along those lines?

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: February 04, 2024, 01:24:03 am
content: Hi coppercone2,Here are the hardness values I could measure :- HP/Agilent rubber bezel : ShoreA 85- Fluke Scopemeter (top & bottom yellow parts) : ShoreA 90This should give you a ballpark if you expect to 3Dprint rubber protections for T&M enclosures.

author: coppercone2
author_rank: Super Contributor
timestamp: February 04, 2024, 01:37:02 am
content: oh wow that is alot higher then I thoughtIf I had to guess I thought it would be around 70. That seems way too soft if I know those guards are 85-90

author: timeandfrequency
author_rank: Frequent Contributor
timestamp: February 04, 2024, 02:28:30 am
content: I also thought it was a bit softer.Old rubber tends to get harder over time.However you don't want your T&M equipement to act like a super bouncing ball.ATPU85Afilament should be a good start.

author: coppercone2
author_rank: Super Contributor
timestamp: February 04, 2024, 02:45:56 am
content: nah I wanted to make molds and cast it I don't like those filament printers one bit
HIOKI 3169-21/ Clamp on power hitester - Page 1
Forum section: electronics / testgear

author: azemati
author_rank: Contributor
timestamp: September 13, 2021, 01:21:21 pm
content: GreetingA friend of mine sent me a power HiTester HIOKI 3169-21 to repair.When the device is turned on, only its back light is displayed and no information appears on the screen.I searched many times and did not find the repair file of this device on the InternetDoes anyone have experience repairing this device?can you help me?Thank you

author: pasta2018
author_rank: Regular Contributor
timestamp: February 01, 2024, 08:34:59 am
content: mine is the same. I have replaced the battery，pressing “set up”or "file"button when power on，but nothing changed.Anyone can help? Thanks!

author: pasta2018
author_rank: Regular Contributor
timestamp: February 01, 2024, 08:38:24 am
content: I also checked bp5311A ，I found the output voltage is 31.15，and when I adjust the contrast，the output voltage didn't change. Could this be a problem?Vin and Vctl is always 5V.
Suin SS7402 Universal Counter - Go or No Go?  - Page 1
Forum section: electronics / testgear

author: tbird
author_rank: Newbie
timestamp: February 01, 2024, 08:52:43 am
content: Hi all!I'm fairly new here (honestly this is my first post), but I'm hoping to get some answers from you guys.I'm about to buy a Suin (has anyone heard of this company?) SS7402 frequency counter. It is offered to me for 400€s.Is it worth this money? Is there anything to complain about? What about the reliability of these things?Many thanks in advance!Martin

author: coromonadalix
author_rank: Super Contributor
timestamp: February 01, 2024, 06:50:57 pm
content: seems a fork of HP Agilent models ...i would say NO unless you are the guinea pig, dismantle it, picture the innards etc ...

author: J-R
author_rank: Super Contributor
timestamp: February 01, 2024, 07:16:45 pm
content: User's Guide:https://www.suindigital.com/data/upload/Users-Guide-of-SS7402_201811.pdfThe price seems high for what you're getting. It's a relatively obscure company out of China and this unit doesn't have the 3rd channel option for frequencies above 200MHz.

author: tbird
author_rank: Newbie
timestamp: February 01, 2024, 07:53:27 pm
content: Quote from: coromonadalix on February 01, 2024, 06:50:57 pmThat would be my Plan. Never seen teardown of this Model. Maybe I will do some YouTube Video...

author: KungFuJosh
author_rank: Super Contributor
timestamp: February 01, 2024, 11:30:41 pm
content: For that kind of money you can buy a decent AWG with a built in freq counter

author: tbird
author_rank: Newbie
timestamp: February 02, 2024, 07:30:53 am
content: OK - i will not buy this Counter.I have found an HP 53131a with 3GHz Option and HS Oven for the same price - will go for that.
Any Hantek DSO2C15 users here who know how to record the protocol decoder output - Page 1
Forum section: electronics / testgear

author: shawty
author_rank: Regular Contributor
timestamp: January 23, 2024, 11:50:46 pm
content: I have a hantek DSO2C15, I've been decoding and monitoring some I2C data streams on a device under test.The built in protocol decode, once you set it up is a very useful feature, but the manual is.... well a bit pants to be honest.I know I can snapshot the screen, and also grab the current wave on screen, but what I really want to do is save out the decoded bytes in the onscreen monitor, preferably in real time if possible.Anyone know if it's at all possible?CheersShawty

author: JohnC
author_rank: Contributor
timestamp: January 31, 2024, 02:45:05 pm
content: Better to ask in the main thread here:https://www.eevblog.com/forum/testgear/new-hantek-dso2x1x-models/At the top of the page, search the word "Protocol" in "This Topic"

author: DavidAlfa
author_rank: Super Contributor
timestamp: January 31, 2024, 03:48:07 pm
content: Not that I'm aware of. Just get a cheap 8ch 24MHz logic analyzer ($8) and use Sigrok or Saelae software.

author: shawty
author_rank: Regular Contributor
timestamp: January 31, 2024, 09:21:07 pm
content: Thanks John-C, I didn't notice that thread the first time round, dunno how I missed that one.:-)

author: shawty
author_rank: Regular Contributor
timestamp: January 31, 2024, 09:22:30 pm
content: DavidAlpha... yea I have one of those already, I was just wondering if it was possible using the scope, since I had it all set up and tracing, didn't want to disconnect everything to get the logic analyzer set up :-)
Radio Shack 22-172 DC clamp meter review/teardown - Page 1
Forum section: electronics / testgear

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 20, 2013, 05:41:11 am
content: I recently bought a Radio Shack 22-172 DC clamp meter for automotive work (tracing down the cause of battery draining over a few days in a 2002 Ford Taurus, turns out to be door switch intermittently making contact with door closed). Radio Shack had a sale on that particular meter (normally $70, now $60) and I also had a $10 off coupon, so I got it for $50.Pros:* Up to 800A AC or DC current measurement with 10mA resolution on 40A range, all for $50.* Supposed to be rated for CAT III 600V. The clamp itself has insulated tips.* True RMS works quite well.Cons:* Annoying beep when changing ranges, but continuity mode is so slow as to be nearly useless. (I disabled the buzzer after that.)* Current range drifts badly, but that might be an inherent limitation of DC current sensing.* DSP seems to be mounted to the board in a manner similar to how cheap electronics are constructed, but I have seen some high quality devices also using that construction, so I'm not sure what to make of it.* No RS232 output.* No wired mA and uA mode, but understandable as that would require an expensive HRC fuse to maintain the CAT III rating.* There's a thin jumper wire going from the input board to the range switch, would that impact the CAT III rating?

author: Omnibro
author_rank: Newbie
timestamp: February 02, 2024, 03:05:09 pm
content: I was just gifted one of these on a job yesterday. It's in very good condition, feels a lot like my 65 dollar Ideal clamp meter. Very happy to have it, as xraytonyb from Youtube has said, 'he who dies with the most meters wins'
viavi/jdsu xgig1000 pcie analyzer software - Page 1
Forum section: electronics / testgear

author: abc4329803
author_rank: Newbie
timestamp: January 30, 2024, 01:53:49 pm
content: I had purchased one jdsu xgig1000 pcie analyzer in eBay. But Viavi which had acquired jdsu refused to provide the basic software to me, and the reason is that i did not purchase it from them. Without it, i could not use the analyzer. Who can provide me this software? thanks.More details: In viavi, you need to register an account for dowdoading software. But register is not open. If viavi refuse you, you could not register it.
SDS2000X HD third-party AWG for Bode Plot - Page 1
Forum section: electronics / testgear

author: m98
author_rank: Frequent Contributor
timestamp: January 29, 2024, 12:13:34 pm
content: Hi,I was just wondering whether the SDS2000X HD also supports non-Siglent AWGs like the Tek AFG3000 for its bode plot function?

author: ebastler
author_rank: Super Contributor
timestamp: January 29, 2024, 12:23:09 pm
content: No, I am pretty sure it does not support other AWGs.There was a thread about a homemade "translator" once -- a Python program which pretends to be a Siglent AWG and sends appropriate commands to a 3rd party generator:https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-and-sds1204x-e-bode-plot-with-non-siglent-awg/
Falling reported thermocouple temperature in warmer room - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: January 29, 2024, 12:15:49 am
content: I moved ANENG Bluetooth multimeter AN9002 with connected thermocouple from the fridge with 45 degrees F to the warm room with 78.7 degrees F.Ideally there would be a very fast reported temperature change to 78.7F, and after that reported temperature would remain approximately constant.To get the real reported temperature as a function of time I used a remote Bluetooth connection from AN9002 to a laptop. The plot of captured 10000 temperature values for about one hour duration is shown on the attached ThermocoupleTemperature.png.We see that after a fast increase from 45F to 77F the reported temperature drops. Even more interesting, about 2000 seconds later, the reported temperature has a peak, then drops again, finally rising at the end of the hour.Such strange behavior is a result of not so perfect Cold Junction Compensation.The internal AN9002 temperature, which is supposed to be used for such compensation, changes slowly. To remove noise, it was filtered by a running average with the size of 60 samples. The result is shown on the attached InternalTemperature.png.
Front buttons on recent Keysight, Keithley equipment stop working - Page 1
Forum section: electronics / testgear

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: January 28, 2024, 05:13:39 pm
content: I have several pieces of fairly recent A-brand equipment (eg. Keithley 7510, Keysight B2962) where many front buttons don't respond unless pressed very hard or don't respond at all. They all were kept in normal lab environment. Beyond the typical rant about how new equipment doesn't last as long as 20-50 year old stuff, have other people experienced this problem? What is the recommended contact cleaning procedure?

author: jjoonathan
author_rank: Frequent Contributor
timestamp: January 28, 2024, 05:32:55 pm
content: Yeah, I obtained a gunked up DMM7510 for "cheap" due to this problem. Here is the cleaning procedure. It works, but it is a pain in the butt. Hopefully less so if you know what to expect.https://youtu.be/PLhyBDveVxI?t=288

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: January 28, 2024, 07:08:40 pm
content: Thanks for the video link! It's insane how hard it is to open, I guess they expect you to just pay >$1k to replace the whole panel. I wonder if the adhesive is the source of contamination on the contact pads. I didn't actually see in the video, how did you clean them?

author: jjoonathan
author_rank: Frequent Contributor
timestamp: January 28, 2024, 07:43:27 pm
content: Adhesive migration (or some volatile component of the adhesive) would be my guess as well. I cleaned the old adhesive off the rubber and circuit board with kimwipes, rubbing alcohol, and patience. I didn't do anything to the button pads (pcb side and conductive polymer side) except scrub them down with kimwipes and alcohol and verify that this improved responsiveness as measured by a multimeter with fast beeper. Getting rid of the bulk adhesive was the least fun part of the process. Best of luck with it all -- the one good thing to come out of this is that in the end the cleaning procedure worked and the buttons are still responsive years later
SDG1025 voltage adjustment/vpp issue - Page 1
Forum section: electronics / testgear

author: pawel5870
author_rank: Newbie
timestamp: January 28, 2024, 06:16:50 am
content: My SDG1025 has issue to adjust voltage and I'm trying to fix it. It's change voltage when relay switching it, but there is no smooth volatage change (only tree voltage levels). I wondering if it can be U72 DAC. There is T1 test point, does anyone can say or check if vpp adjustment should be see on this test point, on my is no reaction a the is weird constant wave on T1 and it's not change whenever I change wave, voltage or frequency. I U72 output should react on voltage adjustment, it means U72 is faulty.

author: tautech
author_rank: Super Contributor
timestamp: January 28, 2024, 06:59:34 am
content: Quote from: pawel5870 on January 28, 2024, 06:16:50 amWelcome to the forum.See the SDG800 and SDG1000 thread for info on repairing these models:https://www.eevblog.com/forum/testgear/the-sdg1000-and-sdg800-thread/
Isolated differential probes: Analog isolation vs. Digital isolation - Page 1
Forum section: electronics / testgear

author: PyroFire
author_rank: Newbie
timestamp: January 27, 2024, 08:10:50 am
content: Hi, I am new here with a power electronics backgroundI've been reading topics related to Isovu and other isolated probes and became quite curious as to why the isolation probes have taken a route for analog isolation.Sounded like such optical isolation is not new, but calibration across temperature and offset is quite challenging.What are the pros and cons of digital isolation? To clarify, I've added two block diagrams below.Would bandwidth limitation be the main limiter for having an isolated amplifier + ADC + some form of fast communication back to FPGA?

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 27, 2024, 08:51:30 am
content: It's a question of power/bandwidth. Do some calculations as to what power it would take to digitise an analog signal at lets say 10..12bits and 2 or 3 GHz sampling rate. At these speeds ADCs are parallel output, so you need to serialize the stream (even more speed) to be transmitted over 1 fiber, also the clock needs to be transmitted to the receiver too for sync purposes.Eventually you will realize that many Watts of power are required for this kind of digital transmission, which is incompatible with a fully isolated probe head as needed in these applications.So it's better so go the analog way and solve the offset/amplitude calibration by other means, when these probes are stable in temperature the calibration is fine and in some of these products calibration takes only 3..5 seconds and can do so even with an input signal live.The digital approach would make sense for low (<10MHz) bandwidth probes

author: PyroFire
author_rank: Newbie
timestamp: January 27, 2024, 06:12:21 pm
content: https://cleverscope.com/products/CS1200I was reading the spec for clever scope's probe (which I think doing analog to digital conversion in the probe head) and 14 bit / 500 MSPS gives 4W. 2 x 5.5AHr cell is needed, which gives 10 hr. May be I am making a wrong assumption somewhere but 5W seems manageable through power-over-fiber?

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 27, 2024, 06:29:49 pm
content: PoF cannot do 5W unless you transmit multiple laser beams.That probe uses 2 huge 21700 5.5Ah batteries thus making my point about power consumption also considering its "only" doing 500Msps for 200MHz which is not that much, I'd like to see the transient response of that probe.

author: PartialDischarge
author_rank: Super Contributor
timestamp: January 27, 2024, 06:42:07 pm
content: 0.6W is what Broadcom currently offers in their AFBR-POC series, and laser+receiver is like >$1200
Fluke PM2525/PM2535 unobtainium LCD alternative - Page 1
Forum section: electronics / testgear

author: hackwell
author_rank: Contributor
timestamp: July 13, 2021, 08:16:40 pm
content: Hi everyone,I recently had the bargain to get two Fluke / Philips PM2525 bench mutilemeters off Ebay. For parts or repair that is.I managed to fix both of them after a LM393 and two BRY39 replacement.But I was left with one issue : a leaky LCD. These custom things are unobtainium of course , so I tried to figure out a way to get around this.there are few attemps to do exactly that :https://www.eevblog.com/forum/repair/philips-pm2525-alternative-lcd-display/andhttps://www.maximintegrated.com/en/design/technical-documents/app-notes/6/6315.html.As I spend way too much time on aliexprees I found this :https://fr.aliexpress.com/item/32953790969.html?spm=a2g0s.9042311.0.0.69c66c37qZekH4This one is perfect for the purpose (a little too small though) but guess what ? it does the job !have look at my github for code and details :https://github.com/AKerambrun/PM2525-OLED-displayNow my meter is fully functionnal except the displayed 'NC' which means not calibrated. bugger!if anyone knows how to generate 1000Vdc and 600Vac +- 0.05%...

author: coromonadalix
author_rank: Super Contributor
timestamp: July 13, 2021, 11:05:13 pm
content: maybe using a signal generator with a signal transformer, something with 32 ohms of more impedance and boosting you signal level that way and add a resistor load like 20k ohms or more to slightly loads it without consuming too much at the primary ??

author: bob91343
author_rank: Super Contributor
timestamp: July 14, 2021, 01:33:21 am
content: Generating the voltage is no big deal. But having it at .05% is another story. Unless you need that range calibrated for your use, perhaps you can make the processor think you calibrated it.

author: hackwell
author_rank: Contributor
timestamp: July 14, 2021, 04:15:37 pm
content: Yep you're right. I don't need this level of accuracy anyways. The voltage has to be within certain limits for the processor to accept the calibration though. Once I put th DMM toghether I'll give it a try and post the results. It seems that if only one range is not calibrated the uncal message is still displayed in all ranges leaving only 5 digits readings which is pretty annoying...

author: tooki
author_rank: Super Contributor
timestamp: July 14, 2021, 04:47:54 pm
content: That’s great work — please copy the images to attachments here on the forum so they won’t go missing in a few years when the image host goes out of business, or decides to charge money, or deletes your account or whatever.

author: hackwell
author_rank: Contributor
timestamp: July 14, 2021, 05:14:08 pm
content: DoneI wonder why it didn't work eysterday... I need to include them on github as well

author: TIG
author_rank: Newbie
timestamp: January 27, 2024, 01:02:52 pm
content: This post saved my Philips PM2535, see my post athttps://www.eevblog.com/forum/repair/unobtainium-philips-pm2525-pm2534-and-pm2535-lcd-replacement/. Many thanks!
GW Instek GW-8135 DMM repair help - Page 1
Forum section: electronics / testgear

author: duldog
author_rank: Newbie
timestamp: October 04, 2020, 10:31:38 am
content: Hi folks!I have acquired a defective GW Instek GW-8135 bench dmmIt has a display but this not read anything in all settingsIt has burned parts in the in the power supply section (R101, R104, Q101) and shorted Q502/Q501 which could have probable caused the power supply parts to fail (I have them replaced with J310)D101 is heating up (just a zener voltage reference for Q101), it has D16 label which i cannot find any info (BTW it reads 2V when tested)can you please help me identify the diode? or somebody has the same dmm can you please share some test points or diagram? thanks a lot!

author: Labrat101
author_rank: Unknown
timestamp: October 04, 2020, 06:58:08 pm
content: There are no service schematics as far as I knowThe Link below maybe of some helpThere is a tear down of the GW 8055 herehttps://www.eevblog.com/forum/testgear/gw-instek-gdm-8055-multimeter-teardown/

author: whipaway
author_rank: Contributor
timestamp: January 27, 2024, 01:06:13 am
content: Here is the service manual for the GW Instek GW-8135 DMM.
HP 54645D ROM  - Page 1
Forum section: electronics / testgear

author: apex_seals
author_rank: Newbie
timestamp: January 26, 2024, 04:57:15 am
content: I just acquired an HP 54645D on Ebay for $100. It was in nice shape when it showed up, if you count being coated in nicotine and fuzz inside and out as being in "nice shape"So after a disassembly, scrub, cleaning the pots, and a full calibration, she's off and humming with the RS232/FFT/parallel module attached on the rear from my 54600B that I'm now getting rid of. I even made a set of digital probe cables for it from a cheaper set (dedicated post incoming with instructions).Last thing to do is to upgrade the ROM. I found on this thread (post #5) that HP released a final firmware (~2003?) that "enabled all the features".https://www.eevblog.com/forum/reviews/the-first-megazoom-asic-agilent-dso!/Two questions:1. Features?2. Anybody have a copy of the ROM?I can't seem to find the ROM anywhere. I have version A.02.08 currently, with the bug game and the badger "credits" screen.Thanks

author: apex_seals
author_rank: Newbie
timestamp: January 26, 2024, 05:02:01 am
content: Here's that post #5 I mentioned before. Hopefully this gives free_electron a ping:Quote from: free_electron on August 07, 2012, 09:14:11 pm
R&S BN.424105 SSB-Messadapter  SSB measuring adapter - Page 1
Forum section: electronics / testgear

author: Renaud F5ZR
author_rank: Contributor
timestamp: January 25, 2024, 12:48:00 pm
content: Hi,I just got a R&S BN.424105 SSB-MessadapterDer SSB-Seitenbandmesszusatz findet überwiegend inder Fernsehtechnik seinen Einsatz und gestattet es,die Seitenbänder von Bild- und Tonträger auszumessen.SSB measuring adapterThe SSB sideband measuring accessory is mainly used intelevision technology and allowsto measure the sidebands of image and sound carriers.http://www.messtechnik-colberg.de/common/hersteller-r/rohde-_-schwarz/geraete-r_s/bn_-424105.htmlAs I'm not interested in TV I don't intend to use it as is. It's in fact a VHF/UHF receiver I would lke to find any tech about it.Thanks for a tip!Renaud
Siglent SDG2042X - Page 1
Forum section: electronics / testgear

author: Cauf
author_rank: Newbie
timestamp: January 23, 2024, 10:04:23 am
content: HelloWould it be possible to FM modulate an AUX in (multiplex) signal with the SDG2042X ?This way I would get a FM stereo rf out signal from the 2042 .Or am I missing something ?GrtsPatrick

author: tautech
author_rank: Super Contributor
timestamp: January 23, 2024, 07:07:51 pm
content: Best asked here where all the owners hang outhttps://www.eevblog.com/forum/testgear/the-siglent-sdg2042x-thread/

author: egonotto
author_rank: Super Contributor
timestamp: January 23, 2024, 07:53:04 pm
content: Hello,"Modulation Source Internal/External"It's probably aboutBest regardsegonotto

author: Hexley
author_rank: Regular Contributor
timestamp: January 24, 2024, 05:07:44 pm
content: This might not be exactly what you are trying to do, but check out reply #2 in this thread for some Python code that is supposed to generate an MPX signal with a Siglent AWG:https://www.eevblog.com/forum/testgear/siglent-sdg1032x-bug-in-user-defined-waveforms/
HP 53131A HELP - Page 1
Forum section: electronics / testgear

author: samson
author_rank: Contributor
timestamp: November 22, 2023, 10:26:38 am
content: Hi, I have the HP 53131a Frequency counter with the genuine HP 010 med oven oscillator fitted. My question is if I take the HP 010 out of the unit and bench calibrate it against a 10mz gpsdo and connected to a oscilloscope ,I can adjust the trim pot so it is exactly 10mhz. When put it in the HP010 back into the counter and do a time base calibration is comes up as failed. To fix this I have to turn the trim pot on the HP 010 oscillator out of the 10mhz zone and do the test again and it will pass the test. Is this because the algorithm its to far off for the it to make the adjustment.? and why do they put the trim pot there.The other question is when the HP 53131a comes from the factory fitted with 010 oscillator does it still have the on board oscillator at the back of the unit or do they omit this.Any help or advice appreciated

author: SCSKITS
author_rank: Regular Contributor
timestamp: January 22, 2024, 04:34:56 pm
content: When you bench calibrate the HP oscillator against your reference timebase, did you set the electronic frequency control input on the oscillator to mid range?If not, the mechanical adjustment may get you to 10MHz but be out of range for the electronic calibration as the input will be set all the way to one end.ed.

author: Tony_G
author_rank: Super Contributor
timestamp: January 22, 2024, 06:11:33 pm
content: You don't need to take it out of the 53131A unless you want to use it for some other reason - They're designed to be calibrated in place.The procedure is documented in theService Manualon page 2-24:QuoteTonyG

author: SCSKITS
author_rank: Regular Contributor
timestamp: January 24, 2024, 12:46:52 pm
content: To get to the calibration menu, you have to press the Scale & Offset key while turning power ON.Then press the Scale & Offset key untilCODE:is displayed.Then you can access the menu list.Use the arrow keys to get to the timebase cal menu item as mentioned in the previous post.At this point, wait for the timebase to warm up, the longer the better.I usually run it at this point over night so I do not have to cycle power after the oven is warm.If you want, you can connect the 10MHz reference to the counter channel A input and watch the warmup as the counter display approaches 10.000000,0MHz.Note: early versions of the counter do not access the menu in the above manner.The CAL menu is accessed through the UTILITY menu.Also there is no security on the CAL menu in older units.ed
Issue with burst mode on Rigol DG1022Z dropping cycles between bursts. - Page 1
Forum section: electronics / testgear

author: ions
author_rank: Newbie
timestamp: January 20, 2024, 12:11:23 am
content: I am encountering an annoying issue with Rigol DG1022Z Function Generators. There seems to be a bug when operating in burst mode and triggering externally. My goal here is to generate a 60Hz sine that maintains a relative phase shift to the 60Hz signal that comes out of the wall. Unfortunately its not as simple as setting the AWG to output 60Hz with my desired start phase and call it a day, there is small phase drift that builds up over time. My solution is to use a Line Trigger (which converts the 60Hz sinusoid from the wall into a square wave) to externally trigger a burst of a specified the number of cycles N (a cycle is the same as a period) of the sine wave to output. So N = 5 will output a sine wave for 5 periods, then idle at the specified idle level. It is meant to idle until the next trigger event. At which point the next burst of N cycles is produced. See attached image of very small idle period between bursts (used N = ~50, freq=60.00001Hz, slightly higher freq means burst should complete just before next trigger event). (IMG_1559)The issue I'm seeing is intermittent, where occasionally there are long idle periods (longer than several cycles) between bursts. This means somehow the AWG is missing a trigger event. See attached image with long idle periods (which has N=30cycles, f=60.00001Hz). (IMG_1558)If anyone has encountered this and figured out why sometimes cycles get dropped between bursts, please let me know what you know. I'm a grad student, and we are thinking might just need to upgrade to a better AWG, but saw this forum and wanted to see if anyone knows. Thanks

author: Grandchuck
author_rank: Super Contributor
timestamp: January 20, 2024, 02:06:34 pm
content: http://www.leapsecond.com/pages/mains/Phase/frequency deviations 60 Hz line

author: Hexley
author_rank: Regular Contributor
timestamp: January 20, 2024, 05:48:55 pm
content: Quote from: ions on January 20, 2024, 12:11:23 amHow about capturing the line trigger signal on a second trace so you can verify that the trigger did (or did not!) happen before the dropped burst?

author: ions
author_rank: Newbie
timestamp: January 24, 2024, 12:49:59 am
content: I think this ended up being the issue. After looking closely at the line trigger signal on the scope I could see fluctuations large enough to create a situation where the next trigger event comes just before the end of the burst. My solution is to characterize the size of these fluctuations and increase the frequency of the AWG such that bursts will always (or 99% of the time) finish before the next trigger event. Or I need to stabilize the line trigger signal somehow, but I'm not really sure how to do that.

author: 2N3055
author_rank: Super Contributor
timestamp: January 24, 2024, 09:24:47 am
content: Really proper way of doing this would be to create 10MHz oscillator PLL locked to mains frequency, and then use that locked 10MHz oscillator as a reference for AWG.Just saying...
SIGLENT SVA1000X SERIES VNA FIRMWARE UPGRADE   V3.2.2.6.0R7 - Page 1
Forum section: electronics / testgear

author: W4OP
author_rank: Newbie
timestamp: January 23, 2024, 08:23:31 pm
content: I successfully updated my SVA1032X VNA. One of the new features is (I think) the much ask for ability to plot R and X versus frequency in the S11 mode. While the options now appear in the Menu, the results don't mean anything to me. eg my CAL 50 Ohm load measures 1:1 in the SWR format and shows 50 Ohms on the Smith chart. But using the REAL mode the trace is on zero (0) and the units are U and mU. Of course, I was anticipating the ordinate would be in Ohms.The upgrade notes also mention Reflection Z as a new option, but I have not located that feature yet.Any guidance appreciated.Dale
Getting TekVisa/Microsoft Office Toolbars working in 64-bit Windows! Finally! - Page 1
Forum section: electronics / testgear

author: TheWaterbug
author_rank: Contributor
timestamp: January 23, 2024, 06:58:31 pm
content: Hi all,After many years of struggling with this, I have finally figured out the solution to getting the TekVisa Toolbars for Office running on modern Windows systems.:Short version:Install the 32-bit versions of Microsoft Office, TekVISA, and the TekVISA ToolbarsManually copy the toolbar template files to %OFFICEROOT%\startup and \xlstartAdd those directories as Trusted Locations to the Office Trust CenterLong version, withstep-by-step directions and links.Please let us know if this helps!
Is this scope worth buying? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: January 26, 2024, 03:17:08 pm
content: I know it's not really made by Agilent but for the price is it worth it?https://dallas.craigslist.org/dal/ele/d/dallas-agilent-dso-1102b-oscilloscope/7696614141.html

author: 2N3055
author_rank: Super Contributor
timestamp: January 26, 2024, 03:29:58 pm
content: Quote from: BeBuLamar on January 26, 2024, 03:17:08 pmFor 300 USD ? Absolutely not. That is old Rigol DS1102E.Maybe for 50-100 USD..For a bit more than 300 USD you can get much better scopes from new generations of Siglent/Rigol.

author: Caliaxy
author_rank: Frequent Contributor
timestamp: January 26, 2024, 04:00:22 pm
content: It is believed to be a Rigol hardware with Agilent software (you get the best of both worldsas most complaints about Rigol are about its software, not about the hardware per se…). Nicer than a $100-$150 Tektronix TDS 220 or a $130 FNRSI tablet but less featured than a modern $339 Siglent DSO1202X-E. Your call.I have the 150MHz version of it (Agilent DSO 1152), bought circa 2018 with ~$170 from the now defunct Keysight eBay store (with some warranty back then). I am rarely using it, mostly only when I worry I would damage one of my nicer scopes – for instance, last time was when I was curios to see what kind of “proprietary” signals a Black&Decker car battery "rejuvenator" injects in a dead car battery trying to rescue it…If you have specific questions, I can answer.
UNI-T UTG932E Ground Reference - Page 1
Forum section: electronics / testgear

author: ihaveashihtzu
author_rank: Newbie
timestamp: January 23, 2024, 08:32:21 am
content: I'm using the UTG932e with the supplied USB power adapter (no earth reference).When using the UTG932 to frequency sweep audio amplifiers there is 60Hz noise on the output of the amplifier. Grounding the BNC of the UTG932e to my PS ground which is earth referenced the noise goes away.What's the best way to reference this thing to earth? Simply buy another power adapter that has 3 prongs?I also thought about building an isolated DC/DC supply that would essentially float the scope as there is no issue when I use a USB power bank.

author: wasedadoc
author_rank: Super Contributor
timestamp: January 23, 2024, 10:19:56 am
content: Just have something grounded, The generator, the amplifier or the 'scope.A USB PSU with 3 prongs does not necessarily carry the ground through to the DC side.
Temperature Chamber using a Egg Incubator - Page 1
Forum section: electronics / testgear

author: sithebionic
author_rank: Newbie
timestamp: January 26, 2024, 01:52:07 pm
content: Hi, this is my first post so sorry if I am a bit clueless.I am looking to buy a temperature chamber to test prototypes for up to 75ºC, but they are too expensive.I saw various builds on this forum but they are a bit small.What I want is for a range up to 120ºC and for it to be forced convection for uniformity of temperature.I saw this Egg Incubators from this manufacturer from china:Faithful WPL-125BEhttps://www.faithful.cc/Constant-temperature-Incubator-pd6575981.htmlIf it is as it proclaims this will satisfy my needs. It even allows u to see inside.https://es.made-in-china.com/co_faithful/product_125L-Big-Constant-Temperature-Incubator-with-CE_yssigerugy.htmlThe price on some sites is not much for what it is, even if I have to pay import feed and etc. it would be much cheaper.I wanted to know if any of you knows of this brand and if so maybe you know of a trusty provider?I am open to alternatives if you know of any.My requirements are:Temperature control up to 120ºC, I dont need it to cool.100L of space at least.An internal fan for forced convection.A cristal on the door to allow see inside.Best regards,R.

author: XTEC
author_rank: Contributor
timestamp: January 26, 2024, 02:32:34 pm
content: You can search on Aliexpress. I saw lots of similar products there. Or do a search on Aliexpress for "Lab oven", you get lots of choices for that type of thing. I might even try buying one myself!
Noob alert, should both scope channels display the exact same values when cal?  - Page 1
Forum section: electronics / testgear

author: Turbski
author_rank: Newbie
timestamp: January 23, 2024, 03:09:33 am
content: I'll be honest I feel a bit like a doofus asking this, but I have purchased a FNIRSI 2C23T to take some basic automotive measurements. I'm not doing anything super complicated but I noticed when I connected the probes to my cal on my old BK scope that the readout on the FNIRSI wasn't the same from channel to channel. I did try swapping probes.Is what I am seeing here within acceptable tolerances or do I need to return this unit?Thanks for the help!

author: ataradov
author_rank: Super Contributor
timestamp: January 23, 2024, 03:30:47 am
content: This is normal. If anything, your orange channel is slightly over-compensated, you can see that noise favors the first part of the low level. You can probably make VPP measurement closer by adjusting compensation a bit. But generally, it does not matter.The voltages look strange. Does X1 in the UI mean 1x probe? If so, switch to 10x on both the probe and the scope. 1x mode is mostly useless and compensation adjustment will not do anything in that mode.

author: Turbski
author_rank: Newbie
timestamp: January 23, 2024, 03:31:35 am
content: Quote from: ataradov on January 23, 2024, 03:30:47 amThank you for the confirmation that everything's okay. I appreciate it!
Rigol DG1022Z, selfcreate waveform, not correctly reproduced? - Page 1
Forum section: electronics / testgear

author: kosmos
author_rank: Contributor
timestamp: January 18, 2024, 01:12:07 pm
content: Hello, i try to write wave forms in the .txt format myself, but it only works in part.Example 1:16384 (SamplePoints)16384 (max value)1 (min value)1234.......1638316384empty linegives me a perfect sawtooth.But if I try short examples, then the signal generator fills me always always fills the rest to 16384 with 1, so that my waveform are only short impulses.Example28 (SamplePoints)8 (max value)1 (min value)12344321empty lineWhat is wrong here how can I prevent this if I want, for example, that these 8 sample points should be repeated directly without a long break 9-16384.

author: artur0089
author_rank: Contributor
timestamp: January 22, 2024, 05:13:06 am
content: Arb - Arb Mode - SRate - Store - D: - 8_1.txtcsv or raf or Ultra Station+USB or LAN

author: kosmos
author_rank: Contributor
timestamp: January 22, 2024, 10:43:32 am
content: thanks for the files. Only the .raf file works correctly, meaning that the signal repeats itself permanently. For the other signals, 8192-8 is inserted 8184 times 0, so that there is always a pause in between.Picture 22+23 srate vs Freq. with big pausePicture 24 o.k.Picture 25 fail

author: artur0089
author_rank: Contributor
timestamp: January 22, 2024, 09:41:26 pm
content: Apply the configuration file for the generator 00000.rsf.Then, open the text file 8_1.txt.Further, according to the picture...
Agilent multimeter from Japan - Page 1
Forum section: electronics / testgear

author: ytterligare
author_rank: Regular Contributor
timestamp: January 21, 2024, 11:55:16 pm
content: I’m bidding on eBay for an Agilent multimeter, and I just noticed that the seller did write this on the description:"The voltage of the electronic device on display is 100 VAC, a Japanese product. If you use the voltage in your country, we recommend using a transformer."Now, on the back of the MM (34401A) I see a lot of voltage listed and a small window with "100" inside : given I live in EU with 220V, should I retire from bidding or the seller was overzealous and the voltage can be easily switched to 220 ?Anyone with experience on this ?Edit: found MM manual. It seem that the fuse holder assembly can be rotated in order to show and match the proper voltage…what about the fuse itself…given the pic, it looks like it must not be replaced…

author: bdunham7
author_rank: Super Contributor
timestamp: January 22, 2024, 12:21:49 am
content: If that photo is of the actual unit that you are buying, you should be good. If not, you might want to verify that the back of the auction unit actually looks like that.

author: ytterligare
author_rank: Regular Contributor
timestamp: January 22, 2024, 01:28:00 am
content: Quote from: bdunham7 on January 22, 2024, 12:21:49 amThat’s the actual unit I’m on… thanks

author: Kean
author_rank: Unknown
timestamp: January 22, 2024, 12:05:42 pm
content: On the 34401A the line voltage selection is done via pulling and rotating the fuse holder assembly. The manual says to use the 250mAT fuse for all line voltages (100,120,220,240V).On the 3478A (I happened to recently buy another one from Japan), you have to open the unit up and move an internal wire to change the transformer winding.The important thing to remember isdon't turn it on, take it apart... and check the capacitors and line voltage setting before first power up.Being in Australia, I've had to handle this on multiple pieces of TE coming from USA (not so much for EU).

author: coromonadalix
author_rank: Super Contributor
timestamp: January 22, 2024, 04:51:10 pm
content: for sure you need to change the fuse assembly to select the right voltage ...on you purchase picture do you see the unit workingthe vfd brightness ?? if not stay awaya blown xformer is around 75$ usd, a vfd is easily 130$ usd .... serial number will show if you have the old unobtanium vfd drivers who does over the years mostly the red only plugs or the latest model with black and red plugsyou have to check the sn range to get witch pcb version you have

author: bdunham7
author_rank: Super Contributor
timestamp: January 22, 2024, 05:27:24 pm
content: Quote from: coromonadalix on January 22, 2024, 04:51:10 pmAssuming that the OP's title is correct and it is actually an Agilent-branded unit, none of those things should be an issue.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 22, 2024, 07:35:02 pm
content: yep should be ok