hybridfree/eevblog-posts huggingface dataset:
EIP 575 powermeter (OPT 02) calibration - Page 1
Forum section: electronics / testgear

author: dxl
author_rank: Regular Contributor
timestamp: January 13, 2024, 05:47:55 pm
content: Hi Forum,i converted my EIP 575 a few years ago to have the power meter option. However, i never recalibrated it. I now wanted to do that, as i just learned that the procedure is described in the 545A manual. However, there's one thing i don't understand. The manual states on p02-6:Code:4. Using the following formulas, justify the correction to a number between 10 and 20.....5. Program the corrections in these locations.0000-0005 inclusive0032-0037 inclusive0064-0069 inclusiveLooking at a real rom image (6400002-04H_Power-Meter_A107.BIN) i see:Code:00000000 13 13 13 11 12 12 13 14 14 14 15 15 15 16 17 18 |................|00000010 1a 1a 1b 1b 1b 1c 1d 1e 1e 21 23 26 29 2e 31 3c |.........!#&).1<|00000020 42 46 4d 53 5b 63 6b 73 7b 83 8b 93 9b a2 aa b2 |BFMS[cks{.......|00000030 ba c2 13 13 13 11 12 12 13 14 14 14 15 15 15 16 |................|00000040 17 18 1a 1a 1b 1b 1b 1c 1d 1e 1e 21 23 26 29 2e |...........!#&).|Which isn't what i expected - from the text above was assuming bytes 0000-0005 are all the same values, but apparently they are not. Anyone here know how these values are generated?Thanks!Sven

author: rplabs
author_rank: Contributor
timestamp: February 20, 2025, 11:23:37 pm
content: Hi Sven,Did you manage to calibrate your power meter option in the 575 counter? I have a 578B that also needs calibration after I enabled option 02.One more thing, can you post the firmware file 6400002-04H_Power-Meter_A107.BIN ?Thanks!

author: dxl
author_rank: Regular Contributor
timestamp: February 21, 2025, 07:24:06 pm
content: Yes,committed the script here:https://github.com/svenschnelle/caltools/blob/master/caleip.pyIt uses an HP 8340A for calibration. Can't find the H revision on my disk - looks like I only have D & E flying around.

author: rplabs
author_rank: Contributor
timestamp: February 22, 2025, 09:20:49 am
content: Quote from: dxl on February 21, 2025, 07:24:06 pmThanks for the script. I don't have an 8340A but I have an 8350B with the 83595A plugin. Do you think the commands will work? I looked at the script but I am not a programmer and see that you don't check the equipment type. I also see that you have there an ESG and also a power meter. I guess you reused the script for the ESG flatness and for the EIP those are not needed. Problem with the 8350B/83595A plugin is that it is not synthesized and the power level is not very precise. I will need to re-adjust it but it will not be as good as the 8340.Regarding firmware it looks like I have rev. B from '94. I attached my dumps here. Mine has only one EEPROM for firmware and another one for calibration. If you have time maybe you can attach you dumps.My model is 578B a later release since my boards seems different from others I saw here on the forum.
HP 3456A replacement Plastic PCB holders - Page 1
Forum section: electronics / testgear

author: benj38
author_rank: Frequent Contributor
timestamp: February 21, 2025, 05:50:01 pm
content: I was wondering if anybody has an idea how to get or improvise the black push-style PCB holders used in the HP 3456A.After over 40 years, the plastic dries up and the little "wings" on the bottom side of the board simply break off.

author: benj38
author_rank: Frequent Contributor
timestamp: February 22, 2025, 11:22:37 am
content: To answer my own question, I used the female part of an automotive trim push-pin (7mm diameter), with the original male pin from HP.One has to trim the female part 's crown a bit to a smaller diameter.
SDG2000X resolution difference between TrueARB and DDS modes - Page 1
Forum section: electronics / testgear

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: February 22, 2025, 04:30:34 am
content: I have created a sinc function waveform for my Siglent SDG2000X AWG.The arbitrary waveform can run in one of two modes, 'TrueArb' and 'DDS'.I notice a huge resolution difference between these two modes. (see attached images)The TrueAWB mode appears to be 8 bits (or less) vertical resolution whereas the DDS mode looks to have a much better vertical resolution (probably 16 bits).Nothing I can find in the manual talks about this loss of resolution in TrueARB mode.Can anyone explain whats going on here?Michael

author: tautech
author_rank: Super Contributor
timestamp: February 22, 2025, 04:43:22 am
content: Quote from: Michael-VK2BEA on February 22, 2025, 04:30:34 amSee datasheet P9 Arbitrary Wave characteristicshttps://siglentna.com/wp-content/uploads/dlm_uploads/2024/07/SDG2000X_DataSheet_EN02H.pdf

author: Michael-VK2BEA
author_rank: Regular Contributor
timestamp: February 22, 2025, 05:00:17 am
content: Well, to answer my own question ... it is doing what it should. My sample rate was too small to give a smoother result. With only 500 points over a sinc(-20) to sinc(19), I got what I deserved. Upping the number of samples made the two modes look similar.
Help! Software for Maplin N56FU multimeter needed! - Page 1
Forum section: electronics / testgear

author: jpmccorley
author_rank: Newbie
timestamp: May 04, 2016, 02:17:35 pm
content: Hi Folks,I've recently reformatted my PC and realised I've misplaced the driver CD for my Maplin N56FU Multimeter, would anyone have the driver CD or software available?Any help would be much appreciated!Kind Regards,JP

author: charlespax
author_rank: Regular Contributor
timestamp: May 07, 2016, 03:15:56 pm
content: Here is another thread on this same topic:https://www.eevblog.com/forum/projects/software-wanted-for-the-(rather-old)-maplin-n56fu-multimeter/It looks like there is some conversation onhttp://www.thebits.info/general/n56fu-172.htm/comment-page-1with a few download links. Be careful with random software downloads.

author: smithnerd
author_rank: Regular Contributor
timestamp: May 07, 2016, 09:32:08 pm
content: Apparently the USB->UART chip is a Silicon Labs CP210x. Drivers can be found on their website:https://www.silabs.com/products/mcu/Pages/USBtoUARTBridgeVCPDrivers.aspxThe IC (FS9922-DMM4) is also used in the Uni-T UT61D, which is supported by sigrok, should you want an open source option:https://sigrok.org/wiki/Main_Page

author: Timothy110
author_rank: Newbie
timestamp: February 21, 2025, 11:10:15 am
content: Is this what you are looking for. If you follow the link you should find the folder with the correct software on for your multimeter. I have one to.https://drive.google.com/drive/folders/1hrs8qeJcAKllqCPHPlm4KHQS0cqLGVSJ?usp=drive_link
TPS2000 VS TPS2000B OSILLOSCOPE UPGRADE - Page 1
Forum section: electronics / testgear

author: eevcandies
author_rank: Regular Contributor
timestamp: February 21, 2025, 04:16:24 am
content: I recently got a TPS2024B at a great deal:https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/msg5809569/#msg5809569I was wondering what the "B" was about, since there are also TPS2024 units. After a bunch of research I found this from August 2011 :The Tektronix TPS2000 series of power analysis oscilloscopes, available from TTid, has been updated to improve the viewability of the screen in field-based applications. The newTPS2000B seriesincorporates a brighter and higher-contrast screen which strongly improves the viewing experience in difficult lighting conditions or when viewing the screen from an acute angle, as can occur when working away from the bench.
GW-Instek GDS-806S user calibration problem - Page 1
Forum section: electronics / testgear

author: Machlee
author_rank: Contributor
timestamp: February 19, 2025, 01:54:58 am
content: Hallo.I need to do this procedure, but the lack of a calibration manual stops me. The oscilloscope has a “SELF CAL” output BNC (DC output :0~±2V) on the rear panel and Self Cal Menu (Vertical, Trigger Level and Delay Time). It suggests connecting the calibration output via a tee to both inputs, 1 and 2, and calling the mentioned menu items. It may be necessary to distribute the “SELF CAL” output to Ext Trig as well. I am afraid to mess everything up and contact the service center.

author: wraper
author_rank: Unknown
timestamp: February 19, 2025, 02:20:15 am
content: Generally it's not possible to screw up self cal and if something goes wrong, you can redo it anyway. Scope should ask you to connect BNC cable from cal output to particular input and confirm to proceed further.

author: Machlee
author_rank: Contributor
timestamp: February 20, 2025, 09:26:16 am
content: I launched the vertical one, it shows "Set CAL to CH1, then press F5". I connect it, press F5, it shows "Check signal connection ?". And it freezes, you can only exit by turning it on and off. The cable is intact, the oscilloscope too.

author: wraper
author_rank: Unknown
timestamp: February 20, 2025, 01:48:28 pm
content: Does the scope work fine otherwise? It may be an issue with BNC center pin not making contact. Not all BNC are the same, they have different center pin diameters for 50 and 75 ohm.https://www.eevblog.com/forum/testgear/gw-instek-gds-806s-user-calibration-problem/?action=dlattach;attach=2505357;image

author: Machlee
author_rank: Contributor
timestamp: February 21, 2025, 01:30:43 am
content: Strange, everything started up today. The plugs were definitely 50 ohms.
Rigol MSO5074 - Outliers in Bode plot - Page 1
Forum section: electronics / testgear

author: nephilim
author_rank: Newbie
timestamp: February 20, 2025, 05:54:38 pm
content: Hi,I am wondering why my Bode plots show glitches and even NaN. Running the analysis with unchanged settings several times they are occuring at different frequencies. Varying the number of points has no effect (examples below with 30, 50 and 200 points). I have also checked different amplitudes without success.EDIT: Some additional information. The DUT is the Batronix MSO Demoboard, the wave generator is connected via BNC and signal in & out via the standard probes. The board is fed via the scope's USB port.
Fluke 190 II Windows 10, Windows 11, x64 drivers  - Page 1
Forum section: electronics / testgear

author: patpat
author_rank: Contributor
timestamp: November 02, 2024, 11:24:22 pm
content: I recently got a 190-502 II and accessing the console or running any software from Windows 10 and 11was not possible because drivers were only available for old Windows versions.The Scope has an internal FTDI chip converting USB<->RS232.The old XP/Win 7 drivers provided by Fluke are just the FTDI drivers but using Fluke hardware identifiersVID_0F7E&PID_9006.DeviceDesc="Fluke USB Serial Port"I took the modern x64 FTDI drivers, added Fluke IDs and it worked.For installation just run "install_3.cmd" on an elevated prompt (for this just open a cmd instance as admin)For de-installation you can run FTDI CDMUninstallerGUI_v1.5.exe adding the corresponding Fluke identifier ( VID & PID #s) from the one mentioned before.After driver installation and connecting the scope to the Windows 10/11 x64 PC you'll see the Fluke 190in the Device Manger as shown below.Edit 01:Tested on Windows 11Firmware Upgrade -> OKFlukeView-1 version 5.4 -> OKFlukeView-2 for ScopeMeter® Test Tools version 3.2.0 64bit -> OK

author: patpat
author_rank: Contributor
timestamp: February 21, 2025, 12:23:02 am
content: I wonder why this page recently included in its HTML headerQuoteThen is not indexed by Google...
BK precision scope hack - Page 1
Forum section: electronics / testgear

author: andrejTB
author_rank: Newbie
timestamp: February 18, 2025, 05:29:28 pm
content: Hellohas anyone tried hacking BK precision devices? I have a specific model 2563 and I would be interested to get the license for the generator,I haven't read much about this brand on this forum, can you write some of your opinions about this brand? i realy like it!besides that I use rigol, any problem with licenses

author: coromonadalix
author_rank: Super Contributor
timestamp: February 18, 2025, 05:33:18 pm
content: must be a rebranded product ... many bk stuff are, a matter of finding the right onesome BK are Siglent ....

author: andrejTB
author_rank: Newbie
timestamp: February 18, 2025, 07:53:01 pm
content: i realized its siglent sds2074x.. thanks,but classic hack of sds wont workso its litle bit diffrent, but sw versions is similar

author: coromonadalix
author_rank: Super Contributor
timestamp: February 19, 2025, 08:44:08 am
content: ask @tautech here he may know something in private, i dont know if a cross flash is possible ?

author: tautech
author_rank: Super Contributor
timestamp: February 19, 2025, 08:57:12 am
content: Quote from: coromonadalix on February 19, 2025, 08:44:08 amI don't remember it being simple as there is not an official BW upgrade path, see Optional Accessories:https://siglentna.com/digital-oscilloscopes/sds2000x/You'd need to search this forum for upgrade and 'improvement' tricks.

author: andrejTB
author_rank: Newbie
timestamp: February 20, 2025, 09:40:14 pm
content: yes, no bandwith upgrate available, only MSO and decode. i try all kinds of unlockers for siglent, non of them work. but i was able to update it with siglent fw
RIGOL DHO900 Series – Scaling jumps out of screen area - Page 1
Forum section: electronics / testgear

author: worschi
author_rank: Newbie
timestamp: February 19, 2025, 05:31:17 pm
content: Hey thereSo I have a DHO900 Series Scope which I recently attached to a mainboard on one of the vcore capacitors, giving me a nice saw tooth voltage signal at around 1.4 Volts.Now, when I press "Auto" the signal is in the middle of the screen but a VERY thin line like totally zoomed out but I want to see the signal like maxed in screen height to really see whats going on, so I use the vertical scale to basically "zoom in" but when I do that, it doesn't zoom in, keeping the signal in the middle of the screen but rather it zooms in to some other point than the signal because the signal is then out of the screen area and I have to manually dial it back to the center of the screen using the position knobs. When I then realize I have yet to zoom in again, the same thing happens, it zooms but the signal then is out of the screen again, and I have to dial it back in.While this is done relatively fast during the first 1-2 "zoom steps" it becomes really annoying once we're talking of a scale in the 5mv region. I'm then dialing like a minute or so between each zoom steps to get the signal back in the screen area.This can't be right, now can it? I seem to be doing something terribly wrong here, so if anyone could guide me to like what settings I have to make, to what steps to follow to allow me to just zoom into my signal without having to wear-out the position knobs, that we would be an awesome help to me.Thanks guys

author: iMo
author_rank: Super Contributor
timestamp: February 19, 2025, 05:53:23 pm
content: Try with AC coupling setting in your channel first, the signal should then be in the middle (around zero volt) after Auto..

author: cte
author_rank: Regular Contributor
timestamp: February 19, 2025, 06:09:00 pm
content: @worschi:iMo is correct. You're in DC mode and your looking at the ripple voltage of the capacitor. So your line will be above the ground line. In DC mode, there is a marker on the left side of the screen, showing your ground position. This will probably be at the lower end and pointing downwards when you're zoomed in.AC mode would fix this. (Select channel -> Coupling: AC)But you can also set the scope to zoom in/out of the center of the screen instead: It's in Menu -> Utilty -> Setup -> Expand: Center.

author: worschi
author_rank: Newbie
timestamp: February 20, 2025, 02:21:27 pm
content: Thanks a lot guys, that helps
Kikusui el. Load PLZ 1205W adjustment procedure - Page 1
Forum section: electronics / testgear

author: Quester
author_rank: Newbie
timestamp: February 21, 2025, 10:33:25 am
content: Hello,I am asking here whether someone has aclue how to adjust a device from the PLZ-5W family.I was asking Kikusui directly fordocumentation how to access adjustmentmode, also offered to sign a NDA,but they refused to give out some information.Calibration equipment is here - just needto know how to access calibration/adjustment.Other than for the PLZ 4W-series, where documentationcan be found and there is a calibration menu,the 5W-series is different and both points are missing.Best regards
Need a chip reader / burnner for EEPROMS and NVRAM - Page 1
Forum section: electronics / testgear

author: Zenwizard
author_rank: Regular Contributor
timestamp: February 20, 2025, 02:03:22 am
content: I have a repair on the bench where I have a failed NVram chip that needs to be replaced and updated. I have confirmed that it is the IC at fault and I now need something to updated a X2212P. Does anyone know a good chip reader/writer that will work with this IC?Zen
Fnrisi DCM 100 $35 multimeter - Page 1
Forum section: electronics / testgear

author: watchmaker
author_rank: Unknown
timestamp: February 18, 2025, 04:14:07 pm
content: I bought this to put in my house tools bag. For $35 it is not bad.Low resistance range reads the same as my Shannons once you subtract out the lead resistance (no relative function). Higher resistances are "close enough" as are the capacitance measures. NCV works up to a couple inches away from a socket.My criticism is that it is speced to measure freq up to 10MHz. It goes random above 165KHz. Sine or square from my Siglent AWG.Will write FNRISI.Came w/ latest FW (1.3). Display is bright, flashlight is worthless and they should not have bothered.Need to check its AC amps and watts against my Simpson wattmeter. Would be nice if they included some kind of alligator clips for the non standard probes; but at least they are sharp!

author: joeqsmith
author_rank: Super Contributor
timestamp: February 18, 2025, 04:27:35 pm
content: Quote from: watchmaker on February 18, 2025, 04:14:07 pmMay require zero cross and a higher level. Consider too that the test leads may not be your best choice. Consider using 50ohm coax, terminated at the meter with adapters.

author: watchmaker
author_rank: Unknown
timestamp: February 19, 2025, 04:53:48 pm
content: You are correct. It is accurate to 23MHz. Still need to setup to check AC power measurement.
(Portable) LCR Meter which remembers last setting/mode? - Page 1
Forum section: electronics / testgear

author: kblue
author_rank: Regular Contributor
timestamp: February 18, 2025, 02:55:15 am
content: Hello there!Just a quick question: Any known LCR-Meters which remember the last mode/setting? I have a working LCR200 and it's fine, but it resets after power off and goes back into "Auto LCR".Sure it's a "first world problem" but still ... would be nice to have.Best wishes!

author: KungFuJosh
author_rank: Super Contributor
timestamp: February 18, 2025, 02:58:12 am
content: I don't know about your size requirements, but for all portable needs I use a Shannon ST42 tweezers. They do recall previous state on start.

author: Sensorcat
author_rank: Regular Contributor
timestamp: February 19, 2025, 01:57:05 am
content: Same here: LCR Research LCR Pro1 Plus wakes up in the same mode and range as turned off. Seems logical for tweezer type meters, as they tend to have quite fast auto power-off to save their small battery.

author: DaneLaw
author_rank: Frequent Contributor
timestamp: February 19, 2025, 06:10:51 am
content: Of the 3 LCR-tweezers I got, only the QPLINk seems to remember your settings, so if you put it in 100K Hz and 0.1v.. it will start in that, none of the other two remembers your settings..They all seem to center to auto-mode for obvious reasons, but its the bottom of the barrel of LCR tweezers (4wire) that come down in price quite a lot the last year..A trio like below at sales, were under 100US in total with delivery & 25%EUVAT.They all seem to have the pros & cons... though only the QPLINK1S will do voltage measurement and has an accelerometer that will align the display to your orientation.

author: SmokedComponent
author_rank: Regular Contributor
timestamp: February 19, 2025, 01:11:09 pm
content: I have UNI-T UT622E and it remembers last mode. There are cheaper models than "E", but I'm very happy with it (has DC resistance measurement so is also a portable 4-wire milliohmmeter).
HP 3497a Command Response from Slots - Page 1
Forum section: electronics / testgear

author: cmax100000
author_rank: Newbie
timestamp: February 24, 2025, 03:53:09 am
content: I have Slots 0 through 4 with plug in cards.When I loop through in code with SR 0,0 SR 1,0 SR 2,0 SR 3,0 SR 4,0I get response codes 000342,000377,000041,000340,000041.I get the same codes when entered from the keypad in front.I am trying to query the controller to double check the plug in before continuing.It seems to me that each plug in should respond with something unique. The last digitshould be a 0,1,2,3,or 7 but two of the responses are identical and they are two different boards.Slot0 is a 44429 voltage d/a option 1301 is a 44422 thermocouple relay multiplexer option 0202 is a 44431 High voltage relay actuator option 1503 is a 44425 Digital isolated input/interrupt option 504 is a 44428 digital output actuator option 110I haven't been able to find an answer to this. It seems that there should be someway to query the system and get the hardware installed through software using GPIBcommands. I have the whole manual and can't find it in there. I also thought that there might be unique resistors for each card accessible through the back plane to identify theplug in.I haven't tried a *IDN command yet as I have other really old devices and they do not respond with a name on the identify command. I use the PAD of the device to do a lookup and just assign a name in code.Thanks.

author: Kean
author_rank: Unknown
timestamp: February 24, 2025, 04:43:54 pm
content: I don't have a 3497A or 3498A, but I love reading the old manuals.On page 135 of doc 9018-05394 "3497A Data Acquisition/Control Unit Operating, Programming & Configuration", it describes the response to the System Read (SR) command.A six digit octal value is returned as you see, and the LSD identifies the type of assembly in the slot.0 = Digital Input (opt 050)1 = Actuator or HV Actuator (opt 110, 115)2 = D/A Converter (opt 120, 130)3 = Counter (opt 060)7 = Empty or Analog assembly (opt 010, 020, 070, 071)This is also detailed on page 307.So you only get the general category of assembly in the slot, not the exact model.Your responses are as follows:Slot 0 D/A Converter opt 130: 000342 - so 2 means D/A Converter - correct for opt 130Slot 1 Relay Mux opt 020: 000377 - so 7 means Empty or Analog - correct for opt 020Slot 2 HV Actuator opt 150: 000041 - so 1 means Actuator - correct for opt 150 (not specifically mention in the manual, but presumably upgraded opt 115)Slot 3 Isolated Input opt 050: 000340 - so 0 mean Digital Input - correct for opt 050Slot 4 Digital Output opt 110: 000041 - so 1 means Actuator - correct for opt 110I could not see any mention of what the other 5 digits mean in the response, other than on pages 251 & 260 which mentions both Actuator and HV Actuator options will return 000041.
GPP4323 Terminal Inserts - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: February 18, 2025, 10:02:30 pm
content: Can't remember if this has been done before, but here's a 3D printed insert for the GPP 4323 Power Supply.Someone posted a clever improvement by painting the terminal ends with the proper color because the polarity was difficult to see as the color indicators are not visible end on. Awhile back we had also "painted" the end terminals for this reason, however never "happy" the way it looked, so today we decided to 3D print some "Inserts" to improve the lookAnyway, here's the results before and after the inserts, now our GPP looks "Professional"Note the txt file is a 3mf, remove the txt and replace with 3mf to use with 3D printer.Best
Rigol MSO5104 - Page 1
Forum section: electronics / testgear

author: bigendian
author_rank: Regular Contributor
timestamp: February 12, 2025, 12:09:49 pm
content: HI, was looking at this scope specsThey says 8Gs/s. This data is true ? What are then they needed for ?Also they say 100 Mpts (likely per channel) . this also seems much more than needed, but good.Any general feedback on this instrument, compared to similar more expensive stuff as tektronix ?Thanks

author: Aldo22
author_rank: Super Contributor
timestamp: February 12, 2025, 12:31:54 pm
content: Quote from: bigendian on February 12, 2025, 12:09:49 pmYes, if you only use one channel.With 4 channels it is 2 GSa/s and 25 Mpts per channel.That is good.Sample rate1 channel with 8 GSa/s2 channel with each 4 GSa/s4 channel with each 2 GSa/sMemory depth (standard)1 channel with 100 Mpts2 channel with each 50 Mpts4 channel with each 25 Mpts

author: mwb1100
author_rank: Frequent Contributor
timestamp: February 12, 2025, 08:12:10 pm
content: So many threads with so much information. For a while you couldn't swing a cat on eevblog without hitting an MSO5000 post.EEVblog #1146 - New Low Cost Rigol MSO5000 OscilloscopeRigol MSO5000 ThreadlistSome threads that might not have made it into the above linked thread list:Is a Rigol MSO5000 still worth it after the new DHO's have arrived?Is a Rigol MSO5000 overkill for a hobbyist?Hacking the Rigol MSO5000 - Dr Mefisto Licensing MethodFor anyone in the US reading this and interested in the MSO5000, Saelig has the MSO5074 for $720 until the end of month with coupon FEB2025

author: bigendian
author_rank: Regular Contributor
timestamp: February 12, 2025, 08:43:45 pm
content: Thanks a lot.Will look in those threads.

author: nexus1972
author_rank: Newbie
timestamp: February 13, 2025, 04:39:18 pm
content: I bought my 5104 from telonic in the black friday sale - the main reason being I needed something that had a logic analyser that I can trigger on whilst also monitoring multiple voltages.It came with a free bundled rigol LA probe which is a few hundred on its own - I know theres an aftermarket one but from memory its much more limited in its ranges.Also when buying it you could get a big discount on a licences pack for the 2 arbitrary waveform generators and some other bits I had an interest in.I was looking at the siglent and rigol 12bit scopes but I didnt need that functionality and once I added a LA probe set it was much more expensive. I also have the option in the future to extend the scope if the need arises.Been very happy with how its performed.

author: bigendian
author_rank: Regular Contributor
timestamp: February 18, 2025, 11:23:51 am
content: good to know, thanks a lot
Siglent SPD3303 split +/- power output? - Page 1
Forum section: electronics / testgear

author: omar9000
author_rank: Newbie
timestamp: February 17, 2025, 11:10:22 am
content: I'm in the market for a new benchtop power supply and I'm looking at the Siglent SPD3303 and the UNI-T UDP3305S models.There's the specific question of applying these to audio circuits. I'd like to have a 5-volt supply for logic, and a +/- 15 or 18-volt supply for the amplifier section of my design.How can I do this? I guess I'd set Channel 1 and 2 in series for a 36-volt output (twice 18 volts), and set channel 3 for 5 volts. Is there a common ground? How would I find the "center tap" for the split supply on combined channels 1 and 2?The Siglent manual doesn't say anything on the subject. It does mention that the green earth ground is isolated, so I know that's not the answer. The UNI-T manual similarly doesn't say much.For the Siglent, looks like series mode puts the positive output on channel 2 and the negative output on channel 1. Is the center available at the negative post of channel 2 or the positive post of channel 1?Are either of these models capable of a split output? How is it hooked up?

author: tautech
author_rank: Super Contributor
timestamp: February 17, 2025, 11:52:36 am
content: Easy.With SPD3303X or X-E:Place in Series mode and connect to the center terminal/s of Ch1 and 2 for the 0V rail. (Not GND !)Ch1 becomes master for adjustments and the Series or Parallel mode output gets shown in a relatively new graphic (in the latest HW) on the top edge of the display.Set for 30V to get a 15V+supply.This image from elsewhere in the forum shows the new display when in Series mode, however you'll need to connect as I've described.

author: omar9000
author_rank: Newbie
timestamp: February 17, 2025, 03:19:19 pm
content: I found this threadhttps://www.eevblog.com/forum/testgear/positive-n-negative-voltage-with-siglent-spd3303x-e/which explains the outputs are truly isolated, so they can be configured externally. That is, I can use independent mode and tie Channel 1 negative to Channel 2 positive, and have my center tap there. Channel 1 positive will be my positive rail, Channel 2 negative my negative rail, and I can independently vary the rails if I wish.

author: tautech
author_rank: Super Contributor
timestamp: February 17, 2025, 08:13:51 pm
content: Quote from: omar9000 on February 17, 2025, 03:19:19 pmCertainly you can do a split rail supply like that but in Series mode there are no external connection links and the output polarity is opposite to your intention, ch2 will be the + rail.This image from that thread showing the internal linking for Series and Parallel mode which isn't obvious with the PSU in front of you unless it's elevated on a shelf.
"DPS100" Programmable Power Supply - Page 1
Forum section: electronics / testgear

author: Aragorn_84
author_rank: Newbie
timestamp: February 18, 2025, 08:55:53 am
content: I've got a project in mind where i'd like a programmable DC power supply, which can be controlled by another device, eg over serial/USB.I've come across a small module on aliexpress/ebay called the DPS100, which is a small handheld box which takes USB-PD input and has adjustable output which would be ideal i think. The question is if it can be remotely controlled.There is a port labelled "PC Comm" which i would imagine is some sort of external interface, but i cant see any documentation discussing it.Has anyone seen/used one of these devices and can give any info on this port?Any other recommendations i could look at?Thanks

author: Aldo22
author_rank: Super Contributor
timestamp: February 18, 2025, 09:30:39 am
content: Windows software is available forFnirsi DPS-150.Unfortunately the protocol is unknown afaik (for scripting).

author: danno_cj
author_rank: Contributor
timestamp: February 18, 2025, 06:45:49 pm
content: DPS100 is made by ToolTop and DPS150 is made by Fnirsi. Is very unlikely that software made by Fnirsi will work with DPS100 even they both are similar devices. The question should be go to seller.

author: Aldo22
author_rank: Super Contributor
timestamp: February 18, 2025, 06:54:31 pm
content: Quote from: danno_cj on February 18, 2025, 06:45:49 pmNo, that is almost certainly not possible.I meant that the devices are comparable and that he could buy the Fnirsi if he is okay with this type of remote control.

author: csuhi17
author_rank: Frequent Contributor
timestamp: February 18, 2025, 08:07:46 pm
content: The ads don't mention controlling it with another device.It's possible that it's only for updating the firmware, or if there's a way to save data, then transfer it to the computer.Tooltop doesn't have an official website, or at least I couldn't find one, so I have to ask the seller for the firmware update for my ET15s.I write him an email every few months...If there's software or some kind of description for the control, you can ask for it through the seller.
Agilent 8753ES shows up arrow and P? - Page 1
Forum section: electronics / testgear

author: wd5jfr
author_rank: Regular Contributor
timestamp: February 16, 2025, 05:49:41 pm
content: I found one that has these indications on the left side of the display on the S11 screen. I can' get any more info. Does this indicate that there's pretty good likelihood that the source is bad?ThanksHank

author: wd5jfr
author_rank: Regular Contributor
timestamp: February 17, 2025, 12:54:52 am
content: Here's a pic of the up arrow & P?.. What do they mean? If I look closely I can see in red what might be the beginning of the word CAUTION. Any ideas are appreciated.ThanksHank

author: wd5jfr
author_rank: Regular Contributor
timestamp: February 18, 2025, 07:21:13 pm
content: The obliterated display message is: Caution: No IF found: Check R Input Level.Is this a bad YIG?ThanksHank
EEVBlog / Brymen multimeter comparison? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: February 15, 2025, 11:10:00 pm
content: Is there a spreadsheet that shows the different characteristics of the different EEVBlog multimeters?

author: Simmed
author_rank: Frequent Contributor
timestamp: February 15, 2025, 11:14:38 pm
content: this 1?https://www.eevblog.com/forum/testgear/multimeter-spreadsheet/

author: J-R
author_rank: Super Contributor
timestamp: February 16, 2025, 06:03:34 am
content: The multimeter spreadsheet hasn't been updated in years, so it is not of much use in this case. Also, I think it's slightly less useful for handhelds.The 121GW has a lot of secrets that can't immediately be seen by looking at it, but all of the Brymen (BM models) DMMs pretty much give away their features just by looking at them.Probably the best course of action is to just give us a short list of what you really are needing your DMM to do. Then typically a specific model will stand out.
Rohde & Schwarz SMH Error message - Page 1
Forum section: electronics / testgear

author: Eddiee
author_rank: Newbie
timestamp: November 01, 2019, 12:23:04 pm
content: I have a problem with a Rohde & Schwarz SMH signal generator. the model is 845.4002.52. 100Khz - 2000Mhz.I get a flashing statues LED and an error code 6. The manual tells me that error code 6 refers to 'Battery level too Low'.Where is the battery? I have opened the cabinet and there is no battery to be seen. Most of the circuit boards are inside screened cases which I am reluctant open! I cant find a battery in the service manual - or any reference to a battery in the users manual.Otherwise the generator sems to be working OK - but I havent checked all the functions. Any help with this would be most gratefully welcomed.Since this post I have solved the problem.There is a battery inside the processor case which is located at the top front inside the unit. First remove the feet at the rear of the unit and then remove the top cover. The processor case is seured with folding clips that are easy to operate. Once removed, the case is opened by removing the self-tapping screws on the component side. The battery is a half-size AA lithium Thionyl type ( RS Stock No. 436-4768 ). Simply unsolder the old battery and solder in the new one, taking care to observe correct polarity.Eddiee

author: mgonee
author_rank: Newbie
timestamp: February 16, 2025, 10:28:17 pm
content: Thank you..! Eddiee. ^^
KO4BB Site Broken - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 06, 2025, 11:22:58 pm
content: It looks like KO4BB site is broken. Clicking on any folder in manuals takes you back to the home page.SamW3OHM

author: nctnico
author_rank: Super Contributor
timestamp: February 06, 2025, 11:31:30 pm
content: I suggest to donate in order to keep this valuable site online (and working).

author: Gyro
author_rank: Super Contributor
timestamp: February 07, 2025, 10:53:11 am
content: Please, don't everyone go and have a look for themselves, it just makes things worse! The site has limited resources.

author: coromonadalix
author_rank: Super Contributor
timestamp: February 07, 2025, 03:21:37 pm
content: this is at least the 3rd thread type / post about it

author: eliocor
author_rank: Unknown
timestamp: February 16, 2025, 07:20:54 am
content: I have created a smallTampermonkeyscript:https://greasyfork.org/en/scripts/527081-ko4bbwhich permits you to navigate the KO4BB website without incurring in the problem of returning to the homepage...
EMI test objects? - Page 1
Forum section: electronics / testgear

author: jduncan
author_rank: Regular Contributor
timestamp: February 16, 2025, 01:03:18 pm
content: So lets say I've got my shiny spectrum analyzer and a near field probe / TEM cell. I can make pretty spectrum plots and see some peaks from my boards, but how do I turn this into useful precompliance information?Is there anything out there I can buy that will function like go/no-go gauges? Boards with known characteristics that I can use to convert my uncalibrated measurements into relative judgments of quality?

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: February 16, 2025, 02:17:32 pm
content: I'm just starting to understand this stuff but the key is getting an antenna with a calibration document. Something likehttps://www.tekbox.com/product/tbma1-biconical-antenna/is probably the cheapest thing out there, but it's not hobbyist cheap. Because of the way near-field probes are used I'm not sure calibration is all that useful. Long ago I made a small oscillator in a copper box with a short antenna sticking out a bushing. I clipped the antenna so the signal was just at compliance level for the frequency of operation. It ended up being about 5 mm long. I did this while at a cert lab doing a product for the company I worked for, figuring it would come in handy for pre-compliance work.

author: nctnico
author_rank: Super Contributor
timestamp: February 16, 2025, 02:56:22 pm
content: If your TEM cell has a reasonably good match with 50 Ohms and you manage to position your DUT in the middle, the results will be quite accurate. My own TEM cell's corrections are around 4dB up to 1GHz. You can go down the rabbit hole and getting everything calibrated but unless you invest massive amounts (like >200k euro / dollar) in a shielded / dampened room, your measurements will always be off. So the best approach is to measure relative based on pre-compliance testing at a certified lab. If the lab finds a peak at 200MHz going 6dBuV over the limit and you measure 72dBuV in your test setup, you need to make that 72dBuV drop by at least 6dB. And preferably more. Having test data from a lab also enables you to collect corrections for your own setup.Near field probes are only useful to get a rough estimate where radiation from a board is coming from. A HF low-Z probe to measure signals directly is a good addition for trying to find sources of radiation. Typically it is a particular trace / node in a circuit which causes emissions at a certain frequency (band).
[expired]: Digilent Analog Discovery 3 $100 off (expired) - Page 1
Forum section: electronics / testgear

author: mwb1100
author_rank: Frequent Contributor
timestamp: February 14, 2025, 06:30:40 pm
content: ExpiredDigilent AD3 can be had for $280 (regular price is $380) today. Put theAD3in your cart along with aJumbo Project Boxand you'll get 30% off (no coupon needed).The total for both is $280 which amounts to $100 off the AD3 with a free project box thrown in.They have some other combos that also get 30% off:https://digilent.com/shop/promotions/

author: watchmaker
author_rank: Unknown
timestamp: February 15, 2025, 01:08:29 am
content: $255 with SIMPLY10 Code.
Anyone have a Wavetek 184 and an oscilloscope? Request for a waveform display - Page 1
Forum section: electronics / testgear

author: metertech58761
author_rank: Frequent Contributor
timestamp: February 15, 2025, 10:06:01 pm
content: So I was going through some old files at work and came across a test procedure for something I used to service back in the '90s.This test procedure involved setting up a Wavetek 184 to generate a simulated tach waveform for testing a small motor controller.I've attached a digitized copy of the test procedure - back then, I was just a novice tech and didn't really have the time to monkey around.The Wavetek went back to the customer after we wound down production of this line of equipment, otherwise I would have since set this up myself to have a look.I just want to see if there was anything special about the waveform once the generator was set as specified.
Rigol DSA1030a-TG - Battery Connection pinouts - Page 1
Forum section: electronics / testgear

author: Codfishcatfish
author_rank: Newbie
timestamp: February 14, 2025, 09:49:53 am
content: Hello, after years of trusty service I now find that I need to start taking my SA more mobile and pretty disappointed about the battery being obsolete and the original $1200 price tag too. However, I just wondered if anyone had the pinouts to the battery please. I believe it’s just 6 pin 3 for positive and 3 for negative and the battery contained the 3S charging circuit. The nominal being 11.1vdc. I don’t believe there is feedback for temperature etc and probably not enough pins for balanced charging as the available pins are not large enough for current carrying in my opinion.Before folks leap out and say put a meter on the line and see what’s coming out, yes I can do that but just wanted to put the feelers out for a service manual or pinouts. I’ve emailed Teleonic and Rigol Europe but they just sent me the 24 page service bulletin and owners manual (I already have that as it came with the analyser).So if anyone has the pinouts or the full service manual then please let me know as Rigol are being so cagey.Thanks, Spence
HP 8563E Shows Signal Present at 100MHz and below without an Input - Page 1
Forum section: electronics / testgear

author: cjuried
author_rank: Contributor
timestamp: February 16, 2025, 05:12:52 pm
content: Hi all,I have an HP 8563E which is showing Signal Present at close to 0dB at 100MHz and below without any Input connected. Above 100MHz the unit appears to be working as expected. Any thoughts? Thank you.
adc converters used on oscilloscopes - Page 1
Forum section: electronics / testgear

author: bigendian
author_rank: Regular Contributor
timestamp: February 13, 2025, 08:41:33 am
content: Hi,was wondering what kind of adc converters are used on oscilloscopes with >= 1Gs/ssampling freq.

author: Fungus
author_rank: Super Contributor
timestamp: February 13, 2025, 01:35:12 pm
content: Fast ones!

author: Andree Henkel
author_rank: Regular Contributor
timestamp: February 13, 2025, 01:59:35 pm
content: look into some scope teardown videos.some scope vendors use of the shelf parts like the ones user Fungus linked.other use self designed ones. For example Keysight, R&S do this.

author: Andree Henkel
author_rank: Regular Contributor
timestamp: February 13, 2025, 02:15:08 pm
content: there is a short comparison table, and a description of basic work principle, however folding interpolation is not listedhttps://dewesoft.com/blog/types-of-adc-convertersflash is for highest speed, pipeline can give higher resolution at still high speed, folding interpolation seems to compete with pipeline giving some improvements

author: bigendian
author_rank: Regular Contributor
timestamp: February 13, 2025, 02:23:56 pm
content: Thanks a lot, very clear.
Has anyone any JAVA Application disk image for the TDS7xx series DSO? - Page 1
Forum section: electronics / testgear

author: pmax65
author_rank: Newbie
timestamp: April 06, 2018, 10:09:17 am
content: Hi there,I just modified my TDS580D to get it having colors and turning it to a TDS784D, now I would like to know is someone have any disk images of the java applications that those times were available for these DSOs.I'm interested to anyone of the application, just to give a usefulness to the embedded HD.AFIK the available applications were named this way:TDSPWR1TDSJIT1V2TDSCEM1TDSCPM1Have a great day.Massimo

author: max-bit
author_rank: Frequent Contributor
timestamp: February 13, 2025, 12:47:26 pm
content: I'll bump the topic, maybe someone has found something.

author: TERRA Operative
author_rank: Super Contributor
timestamp: February 13, 2025, 02:10:52 pm
content: I uploaded what I have here:https://www.eevblog.com/forum/testgear/software-for-the-tds500-600-700-series-scopes-here-it-is!!!/msg5716147/#msg5716147
Kikusui cor5501u service manual  - Page 1
Forum section: electronics / testgear

author: JonnyZee
author_rank: Newbie
timestamp: February 11, 2025, 11:26:04 pm
content: Hi, I'm hoping someone has a service manual, or knows where to get one, for a Kikusui cor5501u scope. I've found a bunch of sites with user's manuals but I need to get a schematic etc. ThanksJon

author: coromonadalix
author_rank: Super Contributor
timestamp: February 12, 2025, 10:49:18 am
content: try directly at kikusui under an non disclosure agreement ... i got some psu schematics that way ... at the time they where helpful ...

author: JonnyZee
author_rank: Newbie
timestamp: February 12, 2025, 02:02:55 pm
content: Appreciate the reply. I'll give it a shot

author: JonnyZee
author_rank: Newbie
timestamp: February 13, 2025, 01:48:29 am
content: A guy just got back to me from Kikusui America and they're going to send the service manual after I sign an NDA. Appreciate your help again
DC V & A logging - Page 1
Forum section: electronics / testgear

author: mojoe
author_rank: Frequent Contributor
timestamp: February 08, 2025, 06:38:04 am
content: Is there a relatively inexpensive data logger (preferably to a PC) that simultaneously records DCV & DCA? I only need up to 50 V & 20 A. If the software will calculate Watts for me, that would be a bonus.I can log either one with a meter I have, but not both at once.Edit: Never mind. A search on Amazon only turned up expensive options. However, an internet search turned up this Amazon item on Reddit (go figure).0-300 DCV, 0-50 DCA (or more) with shunt:https://www.amazon.com/PEACEFAIR-Consumption-Communication-Measurement-Interface/dp/B0D2W4YKPSNo reviews, but for $24, I'll take a chance. I'm not sure if it comes with software.

author: mojoe
author_rank: Frequent Contributor
timestamp: February 08, 2025, 07:17:38 am
content: I found the manufacturers site, which lists the protocol, and shows a picture of Windows software. However, I can find no download link. I just emailed them about this.https://en.peacefair.cn/product/786.htmlIt seems that there are several other programming efforts for these products. I found a web app, some Python code, and some Arduino code.

author: mwb1100
author_rank: Frequent Contributor
timestamp: February 08, 2025, 08:12:10 am
content: The vendor might respond with some better information, but the Amazon listing gives basic info that could get you started. It mentions that the unit communicates with themodbus RTU protocol(see alsohttps://modbus.org/docs/PI_MBUS_300.pdf) at 9600-82N.The registers for the various configuration items and data items are given in the Amazon listing as:Quote

author: Fungus
author_rank: Super Contributor
timestamp: February 08, 2025, 08:21:45 am
content: You don't mention accuracy or any other requirements but my first thought is to get an Arduino and a few resistors...

author: kloetpatra
author_rank: Regular Contributor
timestamp: February 08, 2025, 08:29:30 pm
content: I have successfully used this for logging U/I/P via WiFi to PC using python. The advantage with this is galvanic isolation. There is even a 600A version, however resolution depends on the version.https://de.aliexpress.com/item/1005007168934730.html

author: mojoe
author_rank: Frequent Contributor
timestamp: February 09, 2025, 05:32:54 am
content: Those look quite nice, and the WiFi is a plus. The device I linked doesn't have a display, but the RS-485 is optoisolated. I already ordered one from Amazon.

author: mojoe
author_rank: Frequent Contributor
timestamp: February 13, 2025, 12:13:32 am
content: For those using the PZEM-003 or PZEM-017 RS-485 Modbus devices, I found this program, which allows me to log data. It is very easy to use.https://github.com/ModbusScope/ModbusScopeBTW the software from Peacefair is only good to see if the device works. It doesn't log data.