hybridfree/eevblog-posts huggingface dataset:
Rohde FSEM  hangs on startup - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: September 21, 2022, 10:31:44 am
content: Hello,I have a FSEM that boots correctly but hangs on loading the transputers, I replaced the CPU card with my other FSEA, boots fine and loads all the modules. Any clue what that can be?Addind picture of the CPU card (bios 3.3) and where it hangs

author: dxl
author_rank: Regular Contributor
timestamp: September 22, 2022, 07:27:51 pm
content: Likely some problem on the Address/Data bus that goes to the other modules - guess you have no schematics of this board?

author: dxl
author_rank: Regular Contributor
timestamp: September 24, 2022, 04:27:20 pm
content: I now have a ZVRE which has a similar problem it boots, but hangs most of the time at the splash screen. I get some transputer download errors. Unfortunately i don't have another CPU board to test whether that is the same problem as you have. I posted report here:https://www.eevblog.com/forum/repair/rohde-schwarz-zvre-hanging/msg4432519/#msg4432519

author: nctnico
author_rank: Super Contributor
timestamp: September 24, 2022, 04:38:22 pm
content: I'd start by re-seating (removing / plugging back in) everything that is fitted in a socket.
Aim-TTi have released their new SMU4000 series - Page 1
Forum section: electronics / testgear

author: nomead
author_rank: Contributor
timestamp: October 02, 2022, 11:33:58 am
content: At a quick glance not too shabby. If you absolutely need four quadrants there isn't much competition in about 3500-4500 € class (without VAT).I wonder how their Test Bridge SMU software compares to say KickStart?If you have ever complained about depth of Keithleys this one is different, depth only 295mm.https://www.aimtti.com/product-category/source-measure-units/aim-smu4000

author: Someone
author_rank: Super Contributor
timestamp: October 02, 2022, 09:21:30 pm
content: Nice to see a sensible power limiting curve rather than the steps the other manufacturers have, but lacking in pulsed modes so the total envelope ends up smaller (their marketing material is a little "light" there).

author: colorado.rob
author_rank: Frequent Contributor
timestamp: October 04, 2022, 07:56:16 pm
content: Does anyone else think that Aim-TTi need to invest in some industrial design talent? This looks like a generic case from Shenzhen with some custom plastic stickers. It looks cheaper than some Chinese brands.* Note: I own an Aim-TTi PSU that I am quite happy with. It's not pretty either.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: October 04, 2022, 08:20:50 pm
content: Only people with eyes think that.

author: nomead
author_rank: Contributor
timestamp: October 05, 2022, 12:11:19 pm
content: Quote from: colorado.rob on October 04, 2022, 07:56:16 pmAt least they follow the same design language throughout their line up. If you want a work bench with similar style as operating theatre TTi is a safe bet.Now we only need a two quadrant high precision PSU à la R&S NGL200 Series.
Signal Noise of Rigol vs Keysight Scope - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: September 23, 2022, 12:02:42 am
content: It is interesting to compare lowest noise levels of Rigol DS2000A and Keysight DSOX1000.Lowest noise can be observed at the highest real sensitivity, which for both scopes is equal to 1mV/.It is instructive to get noise as a function of frequency. The plots of noise density vs frequency are shown on two figuressemilogy2GSs_fullBW.png and loglog_2GSs_fullBW.png.These figures show the same data in different ways. Semilogy uses linear frequency scale more suitable for higher frequencies,while loglog shows more details at lower frequencies.Maximum sampling rate of 2GSs was used for both scopes.We can see that the noise of Keysight scope significantly drops above 200 MHz, which is the scope bandwidth.On the other hand, Rigol noise declines more gradually at frequencies above 300 MHz bandwidth value.It is interesting that in a wide range of frequencies inside bandwidth the Rigol noise is significantly lower than Keysight noise.For example, at 10MHz Rigol noise is about 3 nV/sqrt(Hz), while Keysight noise is about 9 nV/sqrt(Hz).At low frequencies, below about 100 kHz, noise of both scopes rises with decreasing frequency.Below about 20 kHz Rigol noise becomes much larger than Keysight noise.For each frequency point RMS of 1000 FFT amplitude samples was calculated for Keysight scope,but only 100 FFT amplitude samples were used for Rigol scope.For this reason Rigol curve at large frequencies seems to be wider than Keysight curve.The lower number of Rigol samples is due to much slower communication between Rigol and PC.Python program keysight_getNoiseDensity.py used to download data from Keysight scope to PC is attached.It fully explains how the noise density was calculated.Exactly the same noise density calculations were used for Rigol data,while the code for downloading data from Rigol is much more convoluted.In all cases the scope inputs were externally terminated by 50 ohm load.Internal Rigol 50 ohm termination was not used.It is interesting to compare observed noise densities to the 50 ohm resistorthermal noise density which is about 1 nV/sqrt(Hz).

author: tautech
author_rank: Super Contributor
timestamp: September 23, 2022, 01:21:57 am
content: Quote from: bb1 on September 23, 2022, 12:02:42 amTo properly understand what you see with your tests youneedto study this thread:https://www.eevblog.com/forum/projects/project-yaigol-fixing-rigol-scope-design-problems/
HP 89410A for servo loop analysis? - Page 1
Forum section: electronics / testgear

author: aeg
author_rank: Regular Contributor
timestamp: September 22, 2022, 12:20:46 pm
content: Hi all,First time poster here looking for information on the HP 89410A vector signal analyzer. Would this instrument be suitable for analyzing servo loops? My interest is in generating Bode and Nyquist plots. (I understand I may have to do my own post processing of amplitude & phase information to get the Nyquist plot.) It looks like the 89410A covers both the 100Hz to 1+MHz range you could use a low frequency capable VNA for, and the 1Hz-1kHz range you would normally need a DSA for. It includes a signal generator, although this seems to be de-emphasized in the documentation. But it's not clear to me whether this is an intended application for the 89410A or if I would be fighting with the instrument. Would I be better off with something that says "network" instead of "signal" on the faceplate?
Adding front panel binding posts to HP 6060B DC Load - Page 1
Forum section: electronics / testgear

author: fivesixzero
author_rank: Contributor
timestamp: June 22, 2021, 10:44:00 pm
content: Hi friends,I just finished adding front panel binding posts to my new-to-me HP 6060B electronic load! I figured I'd share a link to my project here along with the OpenSCAD script I created for a thin panel to hold the binding posts in place. And, of course, some tasty images.The script as well as some basic info, including parts details, are in this GitHub repo:https://github.com/fivesixzero/hp-6060b-front-binding-post-modI'm hoping the OpenSCAD script and the details there can help anyone else who's looking to do a similar thing in the future. For now though, here are some images of the modified device during and after installation.

author: AMR Labs
author_rank: Frequent Contributor
timestamp: September 22, 2022, 04:00:14 pm
content: Hi there, any idea where to get a pair of these HP original binding posts in this day in age? I am aware this is a bit of an old post but was hoping to find some leads. Keysight has them listed as PN 1510-0134, ordeable but not in stock.A pair of used original posts in good shape would be fine with me, if anyone has a pair laying about and not using them. Even a single one would be helpful as one on my HP6060B is damaged.I might even consider any other type of posts that have similar current capability but would rather stay with the originals, as they among other advantages can easily accommodate up to AWG #4 without much fuss. Generic ones don't even come close to that.Does anyone know who the original manufacturer of these posts is? The HP service manual being from the 90s does no longer have the usual detailed list of parts suppliers included as it used to be done before. The posts itself do not seem to have any brand or OEM part number markings on them. But if anyone has some information on this because you spotted it on your own binding posts, please share and it would be greatly appreciated.

author: nctnico
author_rank: Super Contributor
timestamp: September 22, 2022, 04:14:05 pm
content: Part number I found is: 1510-0134
Time base setting on Tek 24xx scopes - Page 1
Forum section: electronics / testgear

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: September 20, 2022, 02:49:37 am
content: I've looked around a bit and can't really find a good answer to this, but what is the purpose of this circled selection on the time base knob.

author: bdunham7
author_rank: Super Contributor
timestamp: September 20, 2022, 04:48:18 am
content: If (and only if) you have the scope in the fastest sweep mode of 10ns/div (ignoring 10X magnification) you can pull the knob out and dial in a delay of CH2 of 0 to ~2ns, a sort of skew adjustment. An instruction will appear via readout telling you to adjust the delay using the delta (right cursor) knob. Once you have it adjusted how you like it, you push the knob in and the adjustment persists, even at different sweep speeds. Of course you won't see 2ns except on the fastest few sweep settings.

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: September 20, 2022, 10:53:36 am
content: Quote from: bdunham7 on September 20, 2022, 04:48:18 amI'm presume this would be used, for example, to compensate for differences in arrival times for two signals that are know to be occurring simultaneously.And a question. Does this delay persist through power cycling?

author: bdunham7
author_rank: Super Contributor
timestamp: September 20, 2022, 01:51:44 pm
content: Quote from: Ground_Loop on September 20, 2022, 10:53:36 amI'm not sure what the intended use is nor how it is actually implemented. A variable delay that doesn't affect frequency response or group delay seems a nontrivial design task and I wonder why they went to the trouble.It does persist through power cycling, at least in the brief test that I just did.
Tenma 72-6558 Dual Display Multimeter Manual Request - Page 1
Forum section: electronics / testgear

author: Inhibit
author_rank: Newbie
timestamp: September 19, 2022, 07:43:29 pm
content: I've finally found a nicely featured bench meter that needed a new home for a reasonable price! A Tenma 72-6558. The obvious features seem to work fine and the accuracy seems to be alright.Unfortunately there wasn't a manual. Bit of a long shot, but if anyone has one and could post it I'd appreciate it!(Edit: attached image)

author: JamesBee
author_rank: Newbie
timestamp: September 20, 2022, 09:06:01 pm
content: For some reason I can't seem to post attachments but I found two that may be of some use here.https://www.artisantg.com/TestMeasurement/44081-1/Tenma-72-6558-Dual-Display-True-RMS-Digital-Multimeter

author: Inhibit
author_rank: Newbie
timestamp: September 20, 2022, 10:19:32 pm
content: Thanks! I'll post it as an attachment here... seems there's some issue with the files I'll need to correct. Size maybe.I don't know how I missed that. Either I skimmed it and didn't realize there was a "manuals" tab or I wasn't seeing part of the page for some reason!

author: Inhibit
author_rank: Newbie
timestamp: September 20, 2022, 10:24:58 pm
content: And here's the files, compressed down to forum friendly sizes.
LTE Communication Testers / Networking Testers - Page 1
Forum section: electronics / testgear

author: KrisKringle
author_rank: Newbie
timestamp: March 10, 2022, 12:49:01 pm
content: Hi,I'm looking for a way to test a cellular modem that supports no available LTE bands in my region. I have found there are communication testers such as the R&S CMW500 and Anritsu MD8475B that can act as base station simulators. Can these units be used to fully test data throughput from modem to server? I'm trying to avoid sending units across the world to see if they connect, configure and transmit data.Thanks

author: pdenisowski
author_rank: Super Contributor
timestamp: March 10, 2022, 11:42:31 pm
content: Yes, the CMW500 from Rohde & Schwarz can test data end to end.https://www.rohde-schwarz.com/us/products/test-and-measurement/wireless-tester-network-emulator/rs-cmw500-wideband-radio-communication-tester_63493-10844.htmlAnd what you describe (testing data performance) is a very common application. If you need any more information, please let me know.

author: KrisKringle
author_rank: Newbie
timestamp: March 11, 2022, 07:55:25 am
content: Thank you!I'll read some more on these units. Price seems bonkers though, I will probably try to rent one of them if it comes to it.

author: trp806mo
author_rank: Regular Contributor
timestamp: September 20, 2022, 10:20:20 am
content: For a futur needs (versus the date of the initial post), we are using some amari stuff to emulate a US network for our device in Eu.https://www.amarisoft.com/
SVA1032X - S11 in ohms and phase - Page 1
Forum section: electronics / testgear

author: trampas
author_rank: Regular Contributor
timestamp: September 15, 2022, 09:50:14 pm
content: So I wanted to measure the impedance of a sensor in ohms/degrees for a sensor using the SVA1032X. I was wondering if I was correct in setting up the VNA to do a polar graph in "Lin/Phase" and then assume the linear in conductivity (U) needs multiplied by 50ohm source impedance to get the magnitude in ohms?Also does anyone happen to have a python script that might automate getting this measurement?Thanks

author: virtualparticles
author_rank: Regular Contributor
timestamp: September 19, 2022, 04:29:45 pm
content: If you are measuring the Reflection Coefficient (G) of the unknown, and calibration has been performed such that the reference plane is at the unknown, then the complex impedance is Z0*(1+G)/(1-G) where Z0 is the characteristic impedance, usually 50 ohms and G is the complex reflection coefficient, best expressed in rectangular coordinates for ease of adding and subtracting from "1".See the attached article for the three common ways to make the measurement.
Agilent U1242B handheld DMM photos - Page 1
Forum section: electronics / testgear

author: kodon
author_rank: Contributor
timestamp: November 05, 2012, 06:37:27 pm
content: I didn't find any photos from this meter yet, so here you go! I just picked up this puppy with IR/Bluetooth interface

author: tom66
author_rank: Super Contributor
timestamp: November 05, 2012, 07:23:32 pm
content: Why one fuse on top, one on bottom?

author: SeanB
author_rank: Super Contributor
timestamp: November 05, 2012, 07:37:03 pm
content: No room to fit them on one side. One is for the 10A range and the other is for the other current ranges.

author: tom66
author_rank: Super Contributor
timestamp: November 05, 2012, 08:28:26 pm
content: There are pads for it on the other side... if you got rid of the resistor there, it looks like it would fit. But maybe the batteries go there...

author: NeoMorph
author_rank: Contributor
timestamp: January 04, 2013, 02:40:09 am
content: I got this with the free IR Bluetooth module but you have to buy a silly plastic bracket for £8.10 which is outrageous for a bit of plastic.I do like this meter though and bought the bracket as I wanted the data logging on my pc. Just sad that there is only android mobile software. My iPad and iPhone are currently sulking.

author: vladsol
author_rank: Regular Contributor
timestamp: September 18, 2022, 10:19:14 am
content: Does the rotary switch of u1242a/b dmm rotate 360 degrees?
Anyone used glscopeclient to sync Siglent scopes? - Page 1
Forum section: electronics / testgear

author: Domitronic
author_rank: Regular Contributor
timestamp: September 17, 2022, 09:16:02 pm
content: Hello,has anyone tried to sync 2 Siglent scopes in order to get more than 4 correlated channels? I have seen a video from Andrew Zonenberg where he uses 2 highend scopes from Tek and Lecroy to sync them with his glscopeclient software.But low end scopes like SDS1104X-E or SDS2104X+ do not have a 10MHz reference input. So they could only use trigger out/in to synchronize. And support for SDS1104X-E seems not be completed yet. Has anyone tried it and got decent results?

author: tautech
author_rank: Super Contributor
timestamp: September 17, 2022, 09:21:13 pm
content: New professional product to come before years end with 4 or 8 channels and potential to couple multiple units for a max of 512 channels:https://www.eevblog.com/forum/testgear/siglent-sds6000l-2ghz-12bit-8-ch-(china-only)/

author: Domitronic
author_rank: Regular Contributor
timestamp: September 17, 2022, 09:24:29 pm
content: Yes, i have seen that. but i assume that its not in the price range i would spend for hobby use. Thats why i'm asking for the low-end devices.

author: nctnico
author_rank: Super Contributor
timestamp: September 18, 2022, 12:00:13 am
content: I doubt the trigger output will work as it likely has a lot of jitter. Your best bet is to record the 10MHz reference signal as an extra trace and use that as a time / synchronisation means for the calculation.

author: nomead
author_rank: Contributor
timestamp: September 18, 2022, 10:28:30 am
content: You can de-skew the signals in software but with very tight time bases it still have some limitations due to the inherent trigger jitter.There was quite fiery debate about usefulness of 10 MHz input in the SDS6000A thread.https://www.eevblog.com/forum/testgear/siglent-sds6000-pro-10-and-12-bit-dso-coming/msg4384162/#msg4384162
Power Designs 6010 Information - Page 1
Forum section: electronics / testgear

author: H713
author_rank: Regular Contributor
timestamp: August 06, 2021, 11:51:32 pm
content: Greetings,I know this is a long shot, but I'm looking for any documentation available (especially schematics!) for the Power Designs model 6010 power supply. Any help is greatly appreciated. Surely someone has a manual or a schematic kicking around in their file cabinets...

author: bob91343
author_rank: Super Contributor
timestamp: August 07, 2021, 12:41:07 am
content: I don't know that particular model, but many of the Power Designs units have almost the identical schematics, differing only in voltage range and current. So find something close and it probably will be close.

author: Tubesrule
author_rank: Contributor
timestamp: September 21, 2022, 01:29:11 am
content: Hi,Longer shot, did you ever get any information. I'm trying to find the value of a fried resistor R38, I also got the scr coming a few other nick nacks. But I have no idea the value of the resistor. Can you help with that.Thanks

author: H713
author_rank: Regular Contributor
timestamp: September 21, 2022, 01:41:10 am
content: Never did get anything. Mine ended up being easy enough fixes. The SCR is a crowbar, and it's easy enough to figure out when it's gone short or trigger-happy. That was all that mine needed.I'd still love to find a schematic for one of these pretty things, but so far no such luck.
Over the top diode tester project - Page 1
Forum section: electronics / testgear

author: MathWizard
author_rank: Super Contributor
timestamp: September 16, 2022, 01:11:36 am
content: Some people take their diodes really seriously, it's a bit over the top for regular diodes I guesshttps://www.testequity.com/product/24482-3-2520

author: Grandchuck
author_rank: Super Contributor
timestamp: September 16, 2022, 01:48:23 pm
content: I suppose laser diodes can be quite expensive, justifying this instrument.
Gaussmeter advise please - Page 1
Forum section: electronics / testgear

author: HighVoltage
author_rank: Super Contributor
timestamp: September 14, 2022, 08:57:34 am
content: I am looking for a goodGaussmeterto measure the surface BR in mT of permanent magnets.Any suggestion?

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 14, 2022, 11:52:00 am
content: Not sure how useful it will be seeing as I'm in Japan, but I'm currently getting a quote on a probe from AD-S here, so I know they are a source for meters and probes etc.http://www.ad-s.co.jp/If I get a probe (absolutelynoidea on cost yet...) I'll play with this meter I have for a bit, make a youtube video and probably be looking to sell it off in the next few months, if you are interested....?

author: maxwell3e10
author_rank: Frequent Contributor
timestamp: September 14, 2022, 12:44:32 pm
content: I would look at Alphalabs for a basic Hall-probe based gaussmeter.https://www.alphalabinc.com/product-category/gaussmeters/Another good distributor (at least in US) ishttps://gmw.com/product-category/magnetic-field-measurement/

author: richnormand
author_rank: Unknown
timestamp: September 14, 2022, 07:21:36 pm
content: Depending on how you want to approach this and how well your bench spare parts collection is you might consider a DIY meter.I made one using the Allegro 1302 Hall effect sensor and a Motorola LP2951 voltage regulator.Very inexpensive and quick to build. Almost rivals my lab unit for accuracy too.I use it to measure ion pumps magnets. It will also detect the earth magnetic field well.I mounted the Hall sensor at the end of a plastic straw with some heat shrink over. The readout is a voltage on my DMM.
LCR T5 Multifunction tester firmware  - Page 1
Forum section: electronics / testgear

author: hussamaldean
author_rank: Unknown
timestamp: January 28, 2018, 07:03:20 am
content: Hi all,I got my hand on LCR-T5 multifunction tester but it was so bad and it takes for ever to measure anything, and if it measured it, the value was way way of.they said I can flash it with newer software but I broke itwhere can I find a decent one ?note: Mine comes with rechargeable Li-ion battery

author: hussamaldean
author_rank: Unknown
timestamp: February 01, 2018, 12:49:02 pm
content: any hope?

author: mikepic
author_rank: Newbie
timestamp: November 06, 2018, 08:19:02 am
content: I'm lookinf for the firmware of the multicomponent tester LCR-T5. Mine has blown after measure a capacitor maybe without discharge previously...If anybody has the genuine firmware or any compatible one, it will be appreciatedThanks

author: indman
author_rank: Super Contributor
timestamp: November 06, 2018, 09:47:48 am
content: https://www.mikrocontroller.net/svnbrowser/transistortester/Software/trunk/mega328_T5_st7565/

author: techie
author_rank: Newbie
timestamp: September 15, 2022, 12:31:42 am
content: Here are Markus v1.47 firmware binaries for the LCR-T5, along with the modified source files needed for re-compiling:
Willtek / Aeroflex 9102 Handheld Spectrum Analyzer 100kHz -4GHz - Page 1
Forum section: electronics / testgear

author: M0DMJ
author_rank: Newbie
timestamp: September 17, 2022, 12:44:02 pm
content: Hi all looking for a copy of Wiltek/Aeroflex 9100 Data Exchange Software , can anyone help?Anyone selling parts for 9102 Spectrum Analyzer (Power Head) (VSWR/DTF) (Tracking Gen)?Many Thanks Colin M0DMJ.
Siglent SDS1104X-E:  Not keeping time and date setting. - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: August 30, 2022, 07:48:02 pm
content: I'm getting tired of this scope not remembering the date and time. This is an easy thing to get right. A $3 alarm clock can get it right using technology that was old back in the 1980's.Does anyone else have this problem or did I get a lemon?

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2022, 09:00:26 pm
content: As these scopes do not have a RTC they cannot keep a time setting.However when connected to the internet with the IP of valid NTP server there are a number of options how time displays/stamps can be managed but unless you have the scope set to sync with your local NTP server eitherautomatically syncat boot or manually sync it then it won't work as intended.The NTP time feature was added in a recent firmware update of which a OS update needed to be installed too for both the new Logging and NTP features to work properly.Your OS needs display 8.2 or 3 and FW Version： V6.1.37R2 or later.You can get these here:https://int.siglent.com/download/firmwares/?ProId=12Further instruction for the NTP timeclock is on P217 of the Users manual:https://siglentna.com//wp-content/uploads/dlm_uploads/2021/08/SDS1000X-ESDS1000X-U_UserManual_EN05B.pdf

author: BillyO
author_rank: Super Contributor
timestamp: August 30, 2022, 09:14:48 pm
content: Quote from: tautech on August 30, 2022, 09:00:26 pmFor want of a $0.25 chip, eh?In any case, yeah, that's what I did. I dug out a small 5 port switch and mounted it on my bench behind the SDS1104, the SDG1032 and the SDM3055. Now they are all surfing the net and seems quite content.Thanks tautech.

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2022, 09:24:09 pm
content: Quote from: BillyO on August 30, 2022, 09:14:48 pmAnd a battery.But, almost all 1000 series scopes from all brands do not offer a RTC and it has been this way for many years.I did not know a NTP capability was coming for these 4ch X-E but to do the new Logging feature properly of course some timekeeping was required and if we look back several new features have been introduced to these great little scopes that demonstrates Siglent are listening to you all and obviously there was spare memory and processing capability to add all this new stuff.QuoteYou're most welcome, enjoy !

author: tautech
author_rank: Super Contributor
timestamp: September 18, 2022, 12:41:57 am
content: FYINTP server mobile WiFi connection options for file timestamp needs:https://www.eevblog.com/forum/testgear/siglent-sds1204x-e-released-for-domestic-markets-in-china/msg4419727/#msg4419727
USB interface for Keithley 616 electrometer - Page 1
Forum section: electronics / testgear

author: nitromethane
author_rank: Contributor
timestamp: September 13, 2022, 10:47:01 pm
content: Right, I just finished a new project, that I want to share with you people and the world.As the title suggests, it's an isolated, Arduino based interface board, that connects to a Keithley 616 electrometer to more or less anything with USB host capability and serial over USB capable drivers.The circuit board is designed to be built in to the instrument itself, fitting neatly on the existing pin headers on the instrument main board, with the USB connector accessible on the rear panel.Main source of information for this project was the excellent K616 manual.Source files are available on github:https://github.com/an-ven/K616-USB-InterfaceAll input and output signals from the instrument circuitry are electrically isolated from the Arduino with a bunch of optocouplers except for the range switch position signals, which are already isolated from the rest of the instrument.The interface works by using one of the hardware counters on the Arduino Micro (ATmega32u4) to count pulses of the "gated clock" signal. Number of pulses counted while the "count now" signal is low is equal to the number displayed on the instrument display (ignoring the decimal point).Other instrument state information such as range switch position, decimal point position and measured value sign are represented on a number of parallel signals, which are also read by the Arduino (barely has enough IO pins).The Arduino takes those inputs and based on them generates human and computer passable output strings which get sent out over USB serial connection (Two output modes, see README file on github).Instrument functions zero check, display hold and manual sensitivity selection can also be remotely controlled by sending simple commands back to the interface via USB serial connection.Comments and questions are welcome and I hope, someone else also finds this useful.

author: alm
author_rank: Super Contributor
timestamp: September 14, 2022, 07:59:20 am
content: Nice project! Did you look at how Keithley's digital interface (BCD) model 6162 connected to the 616?

author: nitromethane
author_rank: Contributor
timestamp: September 14, 2022, 10:49:58 am
content: Yes I did. My circuit uses the exact same interface that is used for the model 6162. The optocoupler part of my circuit is quite similar to the model 6162, but the rest of the logic circuitry got replaced by an Arduino and some software.
Looking for Agilent PNA old FW repo? - Page 1
Forum section: electronics / testgear

author: nexus
author_rank: Regular Contributor
timestamp: September 12, 2022, 01:38:04 pm
content: Hi all,Does anyone have a copy of the Agilent/KS PNA legacy firmware files? This page was up until very recently, and of course now I am working on an old unit that needs fw:https://web.archive.org/web/20180113012620/http://na.support.keysight.com/pna/firmware/old/If anyone has these saved somewhere please let me know. I can host them on my website (neonkev.com) for folks in need in the future as well.Thank you!

author: joeqsmith
author_rank: Super Contributor
timestamp: September 12, 2022, 02:43:48 pm
content: I would try the HP groups.io.

author: nexus
author_rank: Regular Contributor
timestamp: September 12, 2022, 03:40:13 pm
content: Quote from: joeqsmith on September 12, 2022, 02:43:48 pmwill do. I will circle back here if I make any progress
Fluke 732B replacement handle and support arms - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: September 14, 2022, 05:34:15 pm
content: I recently received a pair of Fluke 732B, both with damaged front posts. The root cause is that the support arms for the handle are extremely weak because of minimal material around the screw hole where the arm is fastened to the handle. One arm will break and with the weight of the battery the other fails and the 732B is on the floor with plastic bits strewn about. I was also missing one handle.From Fluke the handle is $160, the arms are $20 each. The handle screws are $9 each. The new support arms are the same design and material so it will fail again.I had my machinist friend fabricate a new handle and support arms out of aluminum, photos attached.My question is there a want / need out there for the handle and support arms? What are people's thoughts. The handle and arms do not lend themselves to CNC machining (my friend is capable in both) so it is manually machined. He doesn't consider it complex machining.The arms are compatible with the original handle.The aluminum handle and arms could be anodized black, I haven't priced it out and pricing depends on quantity being done.For straightening out a bent post I used a #24 transfer punch inserted all the way down the post hole and gently tugged the post straight.

author: HighVoltage
author_rank: Super Contributor
timestamp: September 14, 2022, 06:09:07 pm
content: First I need a Fluke 732B!Nice handle, the way it should have been done by Fluke.
Agilent MSO Infiniium scope - change of motherboard, issue with Vbios - Page 1
Forum section: electronics / testgear

author: Pitrsek
author_rank: Regular Contributor
timestamp: September 11, 2022, 03:54:51 pm
content: Hello EEVBlog forum,some time ago I've bought a nice DSO8104A. At some point the plastic pegs that hold cpu cooler broke. Since I had to take it fully apart, I thought I might as well upgrade the PC that is inside.I was cautions not to upgrade it too much, as not to have SW compatibility issue, and also to be able to use the LVDS graphic adapter. So now I have much more memory, super fast dual core, nice intel G43 matx motherboard that supports the pci-e LVDS adapter. But the issue I'm facing is that LVDS panel settings is configured in vbios, and I have no way to configure it. With onboard graphic and external output, I can boot no issue. But with LVDS adapter, resolution is not correct and after windows boots up and increases resolution further I lost. It seems that utility that I'd need is intel bmp ultilty, but I'm unable to find it. Any suggestion would be very welcome. Thanks!

author: nexus
author_rank: Regular Contributor
timestamp: September 11, 2022, 04:18:01 pm
content: I did some digging into the Intel BMP utility. I found a website that appears to be semi-legit, but definitely verify before you download anything:https://www.dssz.org/3671160.htmlI also found a tutorial on modifying bios to add cpu compatability, the 2.6.7 version of Intel bmp is also cited in this post:https://segmentnext.com/intel-coffee-lake-skylake-kaby-lake-motherboards/Hopefully these resources are a step in the right direction.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 12, 2022, 12:38:39 am
content: found theseshttps://www.karol.top/?p=355use google translatehttps://yuknak.com/main/useful/BIOS_edit/BIOS_edit05.htmland this tutorial ??https://www.chrontel.com/upFiles/images/US/By%20Product/CH7308B/Application%20Notes/an94.pdf

author: Pitrsek
author_rank: Regular Contributor
timestamp: September 12, 2022, 09:17:18 am
content: Thank you for the suggestion, I'll try them and report back.
What's going on with my high side gate drive? - Page 1
Forum section: electronics / testgear

author: H.O
author_rank: Frequent Contributor
timestamp: October 12, 2015, 04:43:45 pm
content: (EDIT: I'm sorry, this should of course have been posted in the Project section - not in the Test Equipment section. Any moderator, please feel free to move it.)Hi,I'm designing a H-bridge for a small PMDC servo drive I'm playing around with. I'm seeing things I don't like on the gates of the high side switches, I think what I'm seeing is induced turn-on but I'm not sure and, part from PCB layout (which I Think I have done a fairly good job of (can post layout later), I have no idea what to do....This is what one leg of the bridge looks like, the other half identical, electrolytics and current sense circuitry is shared between both legs:I'm usingPSMN012-100YSMOSFETS,L6387Edrivers, 15ohm gate resistors withDB2J20900diodes in parallel. At the beginning I toasted a couple of L6387 from whatI thinkwas negative spike on the outpin of the driver (drain/source node of the switch leg) so per a suggestion in an ST app note (AN1299) I added a (currently) 7.5 ohm resistor in series with the outpin.Here's what the drive signal looks like with 100ohm wirewound resistor as the load, 20V supply voltage. Ch1 and Ch4 (yellow and blue) are the control signals to the L6387E driver, 500ns deadtime on the PWM signals. Ch2 is the low side gate and Ch3 is the high side gate. First low side turning off, high side turning on.And then low side turning on, high side turning off:I'd appreciate any suggestions, thanks!

author: siggi
author_rank: Regular Contributor
timestamp: October 12, 2015, 08:21:36 pm
content: Your high gate voltage is referenced to the output, not ground. Put one channel on the output and display the difference between the high side gate and the output. That'll show you what the gate driver is doing.Sent from my iPad using Tapatalk

author: E.Klaveback
author_rank: Newbie
timestamp: September 12, 2022, 08:41:25 am
content: Quote from: siggi on October 12, 2015, 08:21:36 pmI would expect this to be the thing. I have had the same things going on on the gate of the high side MOSFET. Here are some scopes of my particular situation where the channel "SWITCH" is the node between the highside/lowside MOSFET connected trough an inductor over to a brushed DC motor.For some reason the output varies from cycle to cycle in time and amplitude with and without a motor connected.
Siglent SVA Distance to Fault - Page 1
Forum section: electronics / testgear

author: eloso
author_rank: Regular Contributor
timestamp: September 13, 2022, 02:56:27 pm
content: Hi,I was looking at testing some long runs of Heliax coaxial cable with my SVA1000X plus (upgrade from SSA) using the DTF mode which I believe uses FDR to provide its measurements.The screenshots online and the manual seem to have options that are not visible on my screen. Display mode units for example.Here is my screen (nothing is connected)And here is a screenshot from the webOn the scond screenshot the right hand menua is labelled "Meas" but if I select "meas" or "Meas Setup" on my DTF screen nothing happens.I would be most grateful if someone could shed light on this. I am sure it will be a real public face-palm moment for me, but nevertheless, I'd love to know.ThanksEloso

author: tomud
author_rank: Regular Contributor
timestamp: September 13, 2022, 06:39:02 pm
content: These are screenshots of the old software (around 2019r), now it has changed and looks different (just like your screenshot). "Meas" is inactive and the menu name is set to "DTF".In fact, they apparently forgot to remove the "Measure" option from the on-screen menu, which could be misleading.

author: tautech
author_rank: Super Contributor
timestamp: September 13, 2022, 08:47:33 pm
content: One from a Sept 2019 post measuring 2 coax cables in series, one 700mm and the other a 5m run.Velocity factor left at the default 0.66 and markers added at the peaks where the joins/ends obviously are.SVA1032X

author: tomud
author_rank: Regular Contributor
timestamp: September 13, 2022, 08:55:49 pm
content: In this video you can still see the old firmware (time 22:05):https://youtu.be/VXXlJkPwxSw?t=1324

author: eloso
author_rank: Regular Contributor
timestamp: September 14, 2022, 10:06:23 am
content: Thanks everyone - - all understoodEloso
HP ET0004 Variable AC Power supply - Page 1
Forum section: electronics / testgear

author: jseefried
author_rank: Newbie
timestamp: September 09, 2022, 09:35:59 pm
content: Does anyone have a manual for this vintage variac? It looks similar to a 431b power meter case style with the knob mounted on the top case. So around 1970s vintage. However I cannot locate in in the hparchive catalogs. Thank you.

author: srb1954
author_rank: Super Contributor
timestamp: September 09, 2022, 09:58:56 pm
content: Quote from: jseefried on September 09, 2022, 09:35:59 pmThe ET model number prefix indicates that it is an HP internal production test gear item. You will be very lucky if you ever find any published information on it.
Q: Front protective cover for HP 16702b logic analyzer? - Page 1
Forum section: electronics / testgear

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 10, 2022, 04:16:44 am
content: Does any kind of cover exist that covers the LCD and controls on a 16702? Has anyone made something?I can see that Tek made one for the TDS3000:https://www.eevblog.com/forum/buysellwanted/fs-tek-tds3000-front-cover/I just picked up a mint condition one and I'd like something that will protect the front from damage when the unit is not in use.Thanks

author: Halberd
author_rank: Newbie
timestamp: September 10, 2022, 02:10:27 pm
content: Hello.There should have been no front panel cover, at least not a genuine vendor front panel cover, on these series of LAs and DSOs from HP/Agilent.This is in contrast to those from Tektronix of the same era, which usually had front covers.We packed a lot of measuring equipment during an office move and had a hard time with equipment that didn't have covers.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 10, 2022, 05:32:50 pm
content: Thanks.Searching I couldn't see an official HP part or anything aftermarket.I posted the TEK link so people would know what I was referring to.From the picture the TEK looks to be formed out of that thin foam type material.I suspect I'm going to need to modify something or make my own. A similar materia to the TEK implies to me a mould which is more work than I fancy.Appreciate any thoughts/advice.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: September 10, 2022, 07:15:38 pm
content: I'll probably just make one out of acrylic sheet. Glue or weld seams. Line with foam to get a snug non marring fit.
Keysight U1733C data protocol - Page 1
Forum section: electronics / testgear

author: KrzysztofB
author_rank: Regular Contributor
timestamp: September 08, 2022, 07:34:56 am
content: Hi.Would like to ask if someone has Keysight U1733C meter with U5481B data cable and could help me answer couple questions.If cable is emulating serial port?- Software require PL2303 driver so most likely yes.Is protocol known and available?I would like to use that meter for some automated capacitance tests.Thanks in advance,Krzysztof

author: kilobyte
author_rank: Regular Contributor
timestamp: September 08, 2022, 07:56:47 am
content: I'm not sure but I think all information about the communication protocol are more or less reverse engineered.The Keysight forum has some information about it. I tried it years ago but I use my U1733C mostly as a handheld.https://community.keysight.com/forums/s/question/0D52L00005IdpcBSAR/u1732c-scpi-commands
Fluke 8840A AC board question - Page 1
Forum section: electronics / testgear

author: Bobson
author_rank: Regular Contributor
timestamp: September 07, 2022, 11:24:31 am
content: My repair of Fluke 8840A is almost done. But I have a problem: AC shows hundreds of millivolts even with probes connected. When I measure higher voltages, readings fluctuate tens-hudreds of millivolts also, but seems to measure OK apart from noise.AC option 9 PCA board is connected to mainboard thru multi-wire flat ribbon cable and J801 AC IN wire.TP810 GND connector is not connected.Should TP810 be connected to mainboard or chassis ground? If so, what is the corresponding contact on mainboard?Or are my problems caused by something else? Self-test doesn't show any errors, DC is OK.

author: wn1fju
author_rank: Frequent Contributor
timestamp: September 07, 2022, 04:57:42 pm
content: TP810 is just a ground test point. It is not connected to anything off the AC board (at least in my 8840A). And there is no mention of removing such a connection in the description of the AC board removal procedure in the service manual. So that's not your problem.The service manual has a pretty elaborate discussion on things to check with a malfunctioning AC board. My guess is a wacky op-amp or problems with one of the DG211 analog switches. If I remember, my problem was a bad NE5532 op-amp.For comparison purposes, my 8840A upon power up shows 00.117 mV in the AC mode with a shorted input. The variation is only about +/-1 least significant digit over a few seconds.

author: Bobson
author_rank: Regular Contributor
timestamp: September 09, 2022, 04:10:28 pm
content: Thanks! After fixing several joints (mechanical fatigue due to broken plastic legs) everything is below 1 mV now.
Keithley Sourcemeter DIGOUT Protection ? - Page 1
Forum section: electronics / testgear

author: JohnPi
author_rank: Regular Contributor
timestamp: September 10, 2022, 05:31:45 am
content: The Keithley Sourcemeters (e.g. 2400) have digital output pins -- DIGOUT. This is shown in the manual as suitable for driving a relay, but no protection against coil inductive spikes is shown. Does it not have protection ? Do I have to add my own diode ?" alt="" class="bbc_img" />

author: gamalot
author_rank: Super Contributor
timestamp: September 10, 2022, 06:32:43 am
content: The diode in the picture (in series with a resistor) is probably what you're expecting, maybe they've drawn the diode's polarity reversed.---Sorry I looked again, that diode and resistor should be for pull-up the output.

author: Kleinstein
author_rank: Super Contributor
timestamp: September 10, 2022, 08:53:26 am
content: The diode to protect from the inductive kickback of the relay should be at the relay. If in doubt add a 2nd diode - it does not hurt.

author: JohnPi
author_rank: Regular Contributor
timestamp: September 10, 2022, 04:34:32 pm
content: No, that diode is probably to prevent an external > 5 V signal from damaging the internal 5 V supply by pulling it up.I'll have to add external diodes to clamp the inductance.
Fluke 28II Holster Degraded - Page 1
Forum section: electronics / testgear

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: September 07, 2022, 02:02:40 am
content: Both of these meters have cases and in the last 10 years sat within a draw virtually unused in all that time. Both were purchased together so they are approx the same age. As you can see the 87V holster looks like it did when new, however the 28II holster has started to degrade. It is hard to capture but there is a white powder forming on the holster and the case of the meter which has been in contact has picked up some of this.I don't know if any of my other meters are also experiencing this, at some point as my wife wants me to sell the unused meters,m it's a bit of a job as most of them remain in packing boxes from over 10 years ago.

author: tautech
author_rank: Super Contributor
timestamp: September 07, 2022, 02:14:45 am
content: Quote from: blacksheeplogic on September 07, 2022, 02:02:40 amAnd she wears/uses all her shoes and handbags on a regular basis ?

author: Brumby
author_rank: Unknown
timestamp: September 07, 2022, 03:35:20 am
content: Thems fightin' words!

author: bc888
author_rank: Regular Contributor
timestamp: September 07, 2022, 03:57:07 am
content: Batteries are fine?

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: September 08, 2022, 05:04:50 am
content: Quote from: bc888 on September 07, 2022, 03:57:07 amBatteries have only leak in my very expensive test gear as well as a favorite meter (189). Everything else is immune.

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: September 08, 2022, 05:09:27 am
content: Quote from: tautech on September 07, 2022, 02:14:45 amI work from home these days due to health reasons. I can't see me every using most of the field gear I have and my wife is well aware of how much money is sitting in boxes unused. Over the years she has always let me buy what I needed so I know where she is coming from on this.
SDG2000X firmware, un documented function - Page 1
Forum section: electronics / testgear

author: xpsion
author_rank: Newbie
timestamp: September 08, 2022, 01:42:15 pm
content: Dear,I know that you can set the display brightness of the SDG2042X / series function generator, by pressing a certain key combination and then turn the rotary when it shows the brightness value in a scale of 1 to 10Unfortunately, I don't remember the key combination and sequence anymore.It is something using alse the left arrow key or both left and rigth arrow keys and simutaniously a thrird key.But which one and in which menu, there are a lot of options: too much.As far as i can remember it has been on this forum 6 years ago but i can;t find it.Current Siglent team has no knowhow about it, and also i don't get any response from 6 other forums in the world.So, what i think is possible is to open the unit and check which pin is used of the ARM processort to drive the backlight with an PWM signal.Then in the datasheet I could trace back the register address of this signal.But is there somebody arrounc that can read the firmware, so we can lookup where this register is set. then we can find the used key combination from the firmware routines, I guess ze can dissamble it ? or....Any idea on this ?Alex
Rigol DS1104Z: does MSO function require upgrade/purchase? - Page 1
Forum section: electronics / testgear

author: JonHendry
author_rank: Contributor
timestamp: September 07, 2022, 10:40:08 am
content: My DS1104Z says "MSO Ready" in the boot screen. Do I need to purchase a software upgrade or anything, or is it just a matter of plugging in the logic probes?(I do already have the probes, I just haven't tried it yet.)

author: Martin72
author_rank: Super Contributor
timestamp: September 07, 2022, 11:54:50 am
content: Plug in and find out...

author: Fungus
author_rank: Super Contributor
timestamp: September 07, 2022, 12:06:13 pm
content: Quote from: JonHendry on September 07, 2022, 10:40:08 amI can think of an easy way to find out...