hybridfree/eevblog-posts huggingface dataset:
Any reviews of hantek 6254 scope? - Page 1
Forum section: electronics / testgear

author: wons
author_rank: Contributor
timestamp: March 08, 2022, 07:04:46 pm
content: HeyI was thinking to buy the hantek 6254 but couldnt find much information and reviews of itI realy like the idea of usb osciloscope so it doesnt take much space and you can always download the graphsAnyone has the hantek 6254 and give his/her opinion on it?Also did anyone hack it and made custom software?
Probe for oscilloscope Tektronic 2201  - Page 1
Forum section: electronics / testgear

author: decoder_82
author_rank: Regular Contributor
timestamp: March 08, 2022, 08:49:30 am
content: Hi,I have an oscilloscope Tektronic 2201 (20 MHz) but I don't have a probe for it.It is supposed to come with a prove P6103 which is not so easy to find.From herehttps://w140.com/tekwiki/wiki/2201It is expecting input impedance with 1 MΩ and 25 pF.I found a P6103Bwhich I think will not work as the manual says "bandwidth not less than 60 MHz"What would be suitable probe for this model ?Thanks in advance !

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: March 08, 2022, 12:06:43 pm
content: P6103B is the recomended 10x probe for that unit, Tektronix 2201.Jeff

author: decoder_82
author_rank: Regular Contributor
timestamp: March 08, 2022, 03:55:19 pm
content: Thanks ! so actually I did not dug enough and indeed the recommended probes for this scope are:- P6103B (10x 60MHz)- P6119B (1x/10x 10/100MHz)- P6101B (1x 15MHz)

author: bdunham7
author_rank: Super Contributor
timestamp: March 08, 2022, 04:10:08 pm
content: Quote from: decoder_82 on March 08, 2022, 08:49:30 amAlmost any cheap probe will work fine with that. The 1M/25pF input just means that any 10X probe needs to have a compensation range that goes up to 25-30pF, which most low-end probes will. More expensive probes might have a lower compensation range and not work properly. For 1X it just doesn't matter, they will all work fine.

author: decoder_82
author_rank: Regular Contributor
timestamp: March 09, 2022, 04:57:02 am
content: Thanks then my cheap clone P6100 probe should work fine.
ValueTronics - Page 1
Forum section: electronics / testgear

author: JAubrey
author_rank: Contributor
timestamp: March 08, 2022, 01:54:28 am
content: Greetings,I got a quote from ValueTronics in Elgin IL for a new Instek GDS1104B that is substantially lower than Saelig or TEquipment.Any experience with them?Thanks,Jack

author: trophosphere
author_rank: Frequent Contributor
timestamp: March 08, 2022, 04:20:19 am
content: I had no problems with them. I bought a new DMM7510 from them a little more than a year ago.

author: JAubrey
author_rank: Contributor
timestamp: March 08, 2022, 04:24:49 am
content: Thanks for the note.One thing that was not in the quote and I forgot to ask about were the probes. I have several quotes and some provide 4 100MHz probes, some 70MHz probes, one quoted 1 probe (for a 4 channel scope), and some did not specify. Once they clarify I will probably buy their scope.Jack

author: JohnG
author_rank: Frequent Contributor
timestamp: March 08, 2022, 01:39:32 pm
content: I recently bought a used Tek AD007 GPIB to Ethernet interface from them. All went fine.John

author: bdunham7
author_rank: Super Contributor
timestamp: March 08, 2022, 02:56:23 pm
content: Quote from: JAubrey on March 08, 2022, 01:54:28 amThey sell both used and new, so make sure the quote is for new!How much is substantial? Both of the other vendors offer a discount to EEVBlog members, 6% I think.

author: JAubrey
author_rank: Contributor
timestamp: March 08, 2022, 03:31:50 pm
content: I don't know if they want me to blab the quote but it is definitely better than 6% off list price of $642.00, free shipping too. I verified that it comes with 4 100 MHz probes.
Probes for Tektronix 2230  - Page 1
Forum section: electronics / testgear

author: bluearchtop
author_rank: Newbie
timestamp: March 07, 2022, 05:13:56 pm
content: Hello - I am getting a Tektronix 2230 but it doesn't have any probes. Do I have to get the P6121 that it originally came with or will a P6100 work ok? Those are cheap on eBay. I'm brand new to this, so thanks for the help!

author: bdunham7
author_rank: Super Contributor
timestamp: March 07, 2022, 05:22:05 pm
content: P6100 should be fine.

author: Jeff eelcr
author_rank: Frequent Contributor
timestamp: March 08, 2022, 12:14:51 pm
content: If the 2230 has readout a P6109 would be a good choice. If going to a cheep probe I would use double the scopes frequency P6200 type.Jeff
Error message Signal Analyzer N9010A - Page 1
Forum section: electronics / testgear

author: Wolf_7
author_rank: Contributor
timestamp: March 07, 2022, 09:42:13 pm
content: Hi All,After my colleague used the signal analyzer N9010A I got an error message “Status, Align Now, All required”. Please see attached pic.I followed the user manual and I didAll Align Option, but no help.I am not very surprised because the analyzer measures 60dBm less than the input signal.Does anyone know what kind of problem could be? Did anyone have a similar problem?Thank You
87V non-contact frequency? - Page 1
Forum section: electronics / testgear

author: brockles
author_rank: Newbie
timestamp: March 08, 2022, 09:27:50 am
content: When on frequency mode on the 87V, if the meter itself is leant on a phone charger lead but the test leads are on nothing, it shows 50Hz. Is this normal?

author: rsjsouza
author_rank: Super Contributor
timestamp: March 08, 2022, 11:57:03 am
content: No, this is not right; it should be reading 60Hz.Just kidding... A multimeter with an open input has enough sensitivity to capture noise from the environment around you. The supply noise may be enough to be picked up and measured by the 87V.

author: brockles
author_rank: Newbie
timestamp: March 08, 2022, 12:09:13 pm
content: Seeing that initial no, this is not right made my heart skip a beat for a moment then!!Thank you very much for clearing that up for me.
Dyna-Quik 510 Socket Panel - Page 1
Forum section: electronics / testgear

author: RossH0755
author_rank: Newbie
timestamp: March 07, 2022, 07:25:04 pm
content: Looking for a schematic for the B&K 510 socket panel add on for the Dyna-Quick 500. Been to Nostalgia Air, Antique Radio Schematics, Radio Museum, Sams, and there's nothing. Any help would be appreciated.Thanks
STEMI 2000-C microscope - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: March 07, 2022, 04:28:43 pm
content: I know this is optical, can anyone answer this:2000-C has a port for the camera, but it steals one of the eye pieces. The 2000CS is a full Trinocular, any chances to find this 50/50 mirror and upgrade it ? or is it a totally different beast ?I have a back lit stand with 6.5x to 50x (eye piece 10X)

author: jfiresto
author_rank: Frequent Contributor
timestamp: March 07, 2022, 05:12:11 pm
content: This attached drawing makes me tend toward "different", but unfortunately I do not know Zeiss microscopes.

author: jpanhalt
author_rank: Super Contributor
timestamp: March 07, 2022, 07:35:48 pm
content: I am not clear on what you mean by "steals" an eyepiece. One usually uses an x0.5 lens or so on that port. That adapter will come with a tube to fit the port and your camera. Or get a lens and use PVC tubing for making an adapter.To be sure we are talking about the same thing, I have attached a picture. Hope it's correct.

author: jfiresto
author_rank: Frequent Contributor
timestamp: March 07, 2022, 08:20:27 pm
content: My understanding of "steals" was that the photo tube steals the image (all the light) that normally goes to an eyepiece, and sends it to the camera, so that that eyepiece goes dark.
[solved] HP 1670e logic analyzer triggering question - Page 1
Forum section: electronics / testgear

author: Dan Moos
author_rank: Frequent Contributor
timestamp: March 07, 2022, 12:59:16 am
content: Trying to use the "mixed display" feature of my HP 1670e logic analyzer. What I want to do is correlate events in the state machine listing to waves displayed by the timing machine.I can get the two machines to display the data I'm interested in after the state machine is triggered, but I have no idea how the two machines relate in time to each other. I want the timing machine to trigger at the same time as the state machine. Maybe it does if the timing machine's trigger is unconstrained, but it's unclear to me.

author: Dan Moos
author_rank: Frequent Contributor
timestamp: March 07, 2022, 03:34:07 am
content: I figured it out. Just discovered the "arming" feature.
Siglent SPD3303C Power Supply Channel 2 Not Floating - Page 1
Forum section: electronics / testgear

author: Hearingaids
author_rank: Newbie
timestamp: March 05, 2022, 06:17:44 pm
content: I purchased 2 of these and one functions correctly in that both channels float. The other has channel 2’s negative terminal connected to the chassis Ground lug.I can send this back to Siglent at some cost or try and fix it myself. I found one other case where someone else had the same problem but just returned it to Amazon. I would have done that but stupidly left it in the box until the return window was closed.Anyway I was wondering if anyone else here had faced the same issue and whether it was an easy fix. Thx for any assistance.

author: tautech
author_rank: Super Contributor
timestamp: March 05, 2022, 07:13:18 pm
content: Quote from: Hearingaids on March 05, 2022, 06:17:44 pmWelcome to the forum.Good catch as this one unit does not meet datasheet spec:https://siglentna.com/wp-content/uploads/dlm_uploads/2017/10/SPD3303C_Data-Sheet_DS0503C-E01C.pdfP3:Insulation: Case to Terminal: ≥20 MΩ (DC 500 V)Contact Siglent NA and have them fix or replace it.info@siglentna.com

author: Hearingaids
author_rank: Newbie
timestamp: March 05, 2022, 08:30:49 pm
content: I have contacted them but was wondering if it would be an easy enough fix to do myself. Thought someone else here might have see the issue.

author: tautech
author_rank: Super Contributor
timestamp: March 05, 2022, 08:41:52 pm
content: Quote from: Hearingaids on March 05, 2022, 08:30:49 pmAnd break the warranty seal ?Best not to but place it back firmly in their lap to sort properly and report back if it's a production issue.But your call.........

author: TimFox
author_rank: Super Contributor
timestamp: March 05, 2022, 08:49:48 pm
content: I doubt that the factory accidentally added a wire to chassis ground, so the problem is probably a bit harder to fix: possibly a shorted capacitor or a stray piece of metal (burr or swarf).If you can arrange it, returning it for warranty service is probably a better idea.

author: tautech
author_rank: Super Contributor
timestamp: March 05, 2022, 09:07:07 pm
content: Quote from: TimFox on March 05, 2022, 08:49:48 pmOr solder bridge. Not the customers job to investigate why it don't meet spec.......

author: Hearingaids
author_rank: Newbie
timestamp: March 05, 2022, 10:34:28 pm
content: Ok. I’ve been convinced. I’ll return it. Thx everyone!
ARI/AMERICAN RELLIANCE (AKA TOPWARD TPS-4000) Needs repair - Page 1
Forum section: electronics / testgear

author: jplbound
author_rank: Newbie
timestamp: March 05, 2022, 09:35:18 pm
content: Hello I have a Topward TPS 4000 power supply and the Master output is not working....No voltage output. I have read that the pass transistor die on the quite often. Are the pass transistors mounts on the heating on the back of the unit? Since this is the American Reliance branded PS-4330 the schematics are lacking. Has anybody had the opportunity to repair one of these lately.Any help would be appreciated; thanks.
TLA602 hard drive faliure - Page 1
Forum section: electronics / testgear

author: vincentsanders
author_rank: Newbie
timestamp: March 05, 2022, 05:05:22 pm
content: I have a TLA602 which has been working just fine for me with windows 2000 and version 4.4 of the analyser software. I have found all the original manuals and paperwork but not the "recovery" cd romsUnfortunately the 21 year old 20gig travelstar 2.5inch hard drive has failed (not really a shock) Before It failed i have taken a backup image of the drive.I have replaced the drive with a 30G SSD (kingston mSATA in 44pin IDE converter) and put the image on it.Unfortunately I simply cannot get windows 2000 to boot without a "inaccessible boot device" error (except in safe mode which is not useful) I have tried all the "repair" options but seem unable to make this work.I have managed a completely fresh install of windows 2000SP4 on the drive but not managed to get the drivers/software to run on this install (it is not the tek branded version, does this matter?).I noticed gslick was kind enough to provide an image of the old 4.4 install media to Enforcer in the 2020https://www.eevblog.com/forum/testgear/tla614-hard-drive-crash/Does anyone have the "Tektronix Logic Analyzer Family Application Software, Version 4.4, part number 063-3487-03, CD-ROM" mentioned in that thread and is willing to let me have a copy?Or alternatively a suggestion of how to obtain a working software install on this system, I know its old but it worked great for what I needed and anything newer is simply beyond my budget.

author: nctnico
author_rank: Super Contributor
timestamp: March 05, 2022, 05:29:05 pm
content: AFAIK you can download the software from Tektronix' website.The TLA software package also includes the drivers but you have to install these manually.

author: vincentsanders
author_rank: Newbie
timestamp: March 05, 2022, 05:45:08 pm
content: perhaps I am just missing something but I used thehttps://www.tek.com/en/support/product-supportpage and gave it TLA602 as a model number but all that is there in the software section is a utility and application, neither of which is actually for installing the software on the unit?

author: nctnico
author_rank: Super Contributor
timestamp: March 05, 2022, 06:11:28 pm
content: Strange, I can only find version 3.2 or version 5.1 or later on the website right now. If you PM me your email, I can send you a ZIP with version 4.4
HP 3312A Erratum? - Page 1
Forum section: electronics / testgear

author: WideBandwidth
author_rank: Contributor
timestamp: March 05, 2022, 08:26:44 am
content: I've been looking at the HP 3312A function gen schematics, and came across an unusual op amp configuration.For reference, the service manual can be found from BAMA:https://bama.edebris.com/download/hp/3312a/3312A_op_ser.pdf.The schematic in question is located on page 60 of the PDF.I've also attached the specific schematic page in question.On the A2 board (the triangle wave integrator board), a controllable current source and a controllable current sink are used to charge and discharge the timing capacitor. The current source and sink are set to be identical currents when a symmetric triangle wave is desired, and dissimilar currents otherwise.Op amps U102 and U103 take a frequency control signal and generate the required current control signals for the source and sink. However, the schematic seems to indicate that U102 and U103 are both configured with positive feedback, which should rail the op amps. That is, the non-inverting terminal is used in the feedback path without any mechanism to invert the feedback gain to get negative feedback.If anything, I would expect U102 and U103 to instead be connected in a constant current source configuration (negative feedback from the Q103/Q104's emitter resistor, setting the transistor current). That constant current would then be converted to a voltage via the collector resistors of Q103/Q104. However in their present state, it sure seems like the circuit would fail to do anything but rail.Any thoughts?
Fluke repair has supply chain problem too? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: March 09, 2022, 12:35:04 pm
content: Fluke Service in Everett, WA USA sent me email saying my repair order is 45 to 60 days delay. I guess they have supply chain problem too.
Hantek DSO1152S not booting - Page 1
Forum section: electronics / testgear

author: Olaf
author_rank: Newbie
timestamp: March 04, 2022, 11:11:22 am
content: Hi everone,I have a DSO1152S which shows a CRC error while booting the kernel.The kernel is not part of the firmware update files and the kernel shouldbe the same for the whole DSO1000 series: DSO1062S, DSO1122S,DSO1152S and DSO1202S.Does anybody have the Linux 2.6 zImage.bin file and can help me?There is a backup tool:https://www.eevblog.com/forum/testgear/hantek-tekway-dso-hack-get-200mhz-bw-for-free/msg86825/#msg86825"Backup tool for Hantek Handhelds : DSO1062B/BV/S, DSO1102B/BV/S, DSO1202B/BV/S"But I have no idea whether it backups the linux too.Best wishesOlaf---##### EmbedSky BIOS for SKY2416/TQ2416 #####This Board: SDRAM is 64MB; LCD display size is: 800 X 480Press Space key to Download Mode.!SD:File System init failed!Start Linux ...NAND read: device 0 offset 0x300000, size 0x400000Skipping bad block 0x000000004194304 bytes read: OKBoot with zImageStarting kernel ...Uncompressing Linux... done, booting the kernel.*** Warning - bad CRC or NAND, using default environment---##### Boot for SKY2416/TQ2416 Main Menu ########## EmbedSky USB download mode ##### Download u-boot or STEPLDR.nb1 or other bootloader to Nand Flash Download Eboot (eboot.nb0) to Nand Flash Download Linux Kernel (zImage.bin) to Nand Flash Download LOGO Picture (logo.bin) to Nand Flash Download UBIFS image (root.ubi) to Nand Flash Download YAFFS image (root.bin) to Nand Flash Download Program to SDRAM and Run it Boot the system Format the Nand FlashSet the boot parameters Download User Program Enter TFTP download mode menu Reboot u-boot Test Linux Image (zImage)Enter your selection:
Replacement safety banana hooks for Agilent N2772A? - Page 1
Forum section: electronics / testgear

author: hanakp
author_rank: Regular Contributor
timestamp: March 01, 2022, 04:51:17 pm
content: Hi everyone, could I buy safety banana hooks from the photos somewhere? They're originally for Agilent N2772A differential probe, but they don't sell them anymore (they had order codes 5063-2191 and 5063-2190). They're nicely small and handy, at least compared to other hooks I currently found in various e-shops. Plus, they have quite sturdy gold-plated hook, not the flimsy steel wire grabers that most similar products got. In reality, they were made by some OEM, so I'm hoping they may be still produced or at least sold in surplus stores and the like. Thanks.

author: Wrenches of Death
author_rank: Regular Contributor
timestamp: March 02, 2022, 07:20:41 am
content: There are/were a couple of sizes of those. They are rather distinctive. I think Pomoma called them minigrabber and minipincers. The bodies were the same size, only the metal "grabber" portions were different size. I've found that both work pretty well.My Pomona 5677B test lead set came with two of each size. Instead of a female jack on the clip body, they had about a foot long lead with a shrouded bananna jack.I just re-inspected mine and suspect that Pomona was the OEM. I originally thought that it was probably Electro-PJP over in France, but couldn't find any of their little trademarks on the grabbers, the lead wires, of the bananna jacks.Your mileage may vary!WoD
How to Calibrate ZOYI-300 AB? - Page 1
Forum section: electronics / testgear

author: masterwizard43
author_rank: Newbie
timestamp: March 01, 2022, 09:11:15 pm
content: A few days back I perchased ZOYI-300 because of its Bluetooth feature, and thought it is cool. I got it for around 35 USD.Every feature works great, it even has "Auto" Mode which works reasonably good. But. It's DC voltage measurements are off by more than 1%On average this DMM showing about 1% more than the actual values.I feel bad throwing away this meter, and want to somehow calibrate it. This meter looks the same as aneng 9002 and i think they are the same. It would be great if anyone can guide me how to calibrate it. Thanks 👍

author: masterwizard43
author_rank: Newbie
timestamp: March 01, 2022, 09:20:21 pm
content: Ohh and, here is how it looks from insidehttps://photos.app.goo.gl/L62oK8e5n17UNDYW9Front viewhttps://photos.app.goo.gl/Pf6pAhKvpSE268v6A
Wavepro 7100 vs 7100a - Page 1
Forum section: electronics / testgear

author: mrcy22
author_rank: Contributor
timestamp: March 01, 2022, 06:03:05 pm
content: What is the difference between the Lecroy Wavepro 7100 and 7100a oscilloscopes?

author: nctnico
author_rank: Super Contributor
timestamp: March 01, 2022, 06:27:15 pm
content: Quote from: mrcy22 on March 01, 2022, 06:03:05 pmAFAIK the first has a floppy drive and the other USB ports.
JYE Tech DSO112A Schematic - Page 1
Forum section: electronics / testgear

author: ondras12345
author_rank: Newbie
timestamp: April 30, 2019, 05:17:34 pm
content: Hi,Does anyone have a schematic for the DSO112A chinese digital oscilloscope? I found this thread on their forumhttps://jyetech.com/forum/viewtopic.php?f=17&t=358, but the files seem to be corrupted.I need the documentation because it measures bad values for the voltage.Real voltageShown value1 V1.08 V2 V2.28 V3 V3.48 V4 V4.64 V5 V5.84 VThat is with 1V/div. The other ranges are the same, except for 5V/div which shows 11.4 V for 5 V real (all the values seem to be multiplied by 2.3 on this range). I don't mind the error on the other ranges that much, but it'd like to fix the 5V/div range.I'm suspecting there might be some resistors swapped on the board, as it was reported herehttps://jyetech.com/forum/viewtopic.php?f=17&t=1850.There are no trimmers inside the oscilloscope, just two trimmer capacitors (C64 and C24). I think they are used to compensate the attenuator, so maybe there's no way to calibrate the attenuation rate.

author: paulca
author_rank: Super Contributor
timestamp: April 30, 2019, 06:09:38 pm
content: Vague recall there might be a calibration in software. Might be wrong though.

author: ondras12345
author_rank: Newbie
timestamp: April 30, 2019, 06:27:13 pm
content: If it uses software calibration, there's no data available on that. The user manual describes the communication protocol for USB scope mode, firmware update procedure, etc., but there isn't anything about sw calibration.

author: shakalnokturn
author_rank: Super Contributor
timestamp: April 30, 2019, 09:24:38 pm
content: Gain could be corrected in software, I'd expect the hardware attenuation is built around the 4051, 4053 though.Is offset right?

author: ondras12345
author_rank: Newbie
timestamp: May 01, 2019, 07:23:07 am
content: Quote from: shakalnokturn on April 30, 2019, 09:24:38 pm5V real at 2V/div: 6.00V when positive voltage is applied, -5.76V when negative voltage is applied.5V real at 5V/div (the bad range): 12.00V positive, -11.6V negativeI'm really suspecting some resistors might be swapped. It was reported before and it would explain the values getting multiplied.

author: glentek
author_rank: Regular Contributor
timestamp: March 01, 2022, 01:33:47 am
content: Old topic, but if anyone has one of these scopes and the 5V range is reading double, two resistors are swapped - shown in photo.They are part of the divider chain for x4, and x10. One on left should be 49.9, and one on right 150.
Looking for HP 54603B CLIP (or 54600A or 54600B series) - Page 1
Forum section: electronics / testgear

author: mightyohm
author_rank: Regular Contributor
timestamp: February 28, 2022, 03:10:54 am
content: Is there a CLIP for the HP 54603B DSO?I've seen some references to a CLIP for the 54600 series but all of the links are broken.

author: alm
author_rank: Super Contributor
timestamp: February 28, 2022, 09:49:39 am
content: Artek Manualssells manuals for the 54600A and 54601A that include schematics. It says email for more details, so I'd send him an emailMy experiences with him have always been great, and the quality of his scans was always excellent. No relation other than being a satisfied customer.

author: mightyohm
author_rank: Regular Contributor
timestamp: February 28, 2022, 07:39:34 pm
content: Quote from: alm on February 28, 2022, 09:49:39 amOh good! I am a big fan of Artek Manuals. I've purchased lots of their manuals in the past. I didn't even think to check. I e-mailed them.
Anyone with a working HP54602A that could give me a dump o U75? - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 28, 2022, 05:07:18 am
content: I have a HP54602A 150MHz DSO (not the B) where U75 has gone flat. Would some kind soul please give me a binary or hex dump of U75 the DS1220AB (can be read as a DS1225 with a MiniPRO programmer. If this part goes flat the scope is toast.Thanks!SamP.S. These parts can be replaced with M48Z18-100PC1 available from Mouser. And will extend the life of the scope another 20 years. You have to desolder the part from the board and replace it with a 28 pin socket. If you have one of the 54600 series scopes it is a great idea to take the part off the board and make a backup of the data before it is too late. Unfortunately I forgot that I had this scope and when I powered it up it was brain dead! All FF's in U75! I hate these lithium backed SRAMS! So I am now backing up my HP54645D's ASAP!
HP3562A Vertical dB units - Page 1
Forum section: electronics / testgear

author: 2nOrderEDO
author_rank: Regular Contributor
timestamp: February 26, 2022, 11:50:24 am
content: Hello folks,INTRODUCTION:We are working on characterizing the noise floor of our LNA (output Vrms), and my friend has a nice HP3562A which we are using for this task. Since the thing is heavy as a boat anchor, usually my friend makes the measurement and sends me the data in .csv so that I can integrate the area under the PSD curve to get our RMS voltage noisefloor. For this I use python, numpy and matplotlib to generate the graphs (example below):The topic is, the HP3562A has several possible units for the logarithmic vertical axis (all units below will be in dB version):Volts peakVolts RMSVoltsVolts2V/√HzV2/HzV2s/HzUp until know, I was receiving the data in dBV2, which yielded me much higher Vrms results when compared to Vrms noise I was observing in the time domain with my RTB2004. My first fail was converting the data in dBV2to volts with 20 * log instead of 10 * log (We are talking POWER density Spectrum here, so it is a ratio of powers, not amplitudes). But even after amending this error, we couldn't match our measurement with the HP3562A to the time domain measurement and our calculated values (RTB2004 agrees wiht calculated noise floor).The second fail was to set the instrument to use dBV2instead of dBV2/Hz. Since the HP3562A is quite an old instrument, we thought dBV2was shown instead of dBV2/Hz due to a display limitation. My friend, which is who operates the instrument, soon discovered the other units above mentioned in the manual. Then he sent me the same curves represented in dBV2, and dBV/√Hz. That is when I realiced that dBV2and dBV2/Hz are not the same: after converting to linear units and squaring the data in dBV/√Hz, I was not getting the same result as the data in dBV2units. That is when I went in to the HP3562A and found out about this different units.WHAT I LEARNED:I understand what dBV/√Hz and dBV2/Hz are, and that the former requires 20 * log and the later 10 * log to convert to the linear form.QUESTION:What are the other units? What are they used for? I specially wonder about dBV2and dBV2s/Hz...Thanks in advance for your insights!Kind regards,Enrique

author: gf
author_rank: Super Contributor
timestamp: February 26, 2022, 08:21:26 pm
content: V is voltage, and V² is proportional to power (since P =V²/R, where V is the RMS voltage (not peak)).Power (or squared voltage) of different frequency bands adds up. Voltages do not add up.If you want to integrate over a frequency range in order to obtain the total power in this range, then you need to integrate the power density (V²/Hz).I also wonder what V²s/Hz is supposed to mean. From the units it seems to be an integral of power density over time. But over which time interval?
Oscilloscope startup with No trace. Please help.  - Page 1
Forum section: electronics / testgear

author: electronic_guy
author_rank: Regular Contributor
timestamp: February 26, 2022, 06:49:28 am
content: Hi,I have a tektronix 2230 oscilloscope which was working fine and suddenly the trace dissappeared while I was working on a very simple circuit (resistor and capacitor to test a differentiator). The display is working. I can see the readout when turned on with readout toggle.The following are the observations I can make now on the oscilloscope. I have attached the screen image and the configuration of the controls below that image.When I pressed the beam finder button, I can see a dot in the bottom of the screen, (image = 20220226_120459.jpg) (image = 20220226_115120-min.jpg)

author: james_s
author_rank: Super Contributor
timestamp: February 26, 2022, 07:04:01 am
content: Something has failed. First thing I'd do is check all the power supply rails in the scope.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 26, 2022, 09:29:15 am
content: Until you repair it, turn down the spot intensity. Without deflection, there is a risk the spot will permanently damage the fluorescent layer of the tube.
ChipMax eetools programmer powersupply - Page 1
Forum section: electronics / testgear

author: Daxxin
author_rank: Regular Contributor
timestamp: February 25, 2022, 04:09:56 pm
content: I've lost the psu adapter who own this model (not the II) can please tell me output adapter voltage and if it's ac or dc?thanks

author: alm
author_rank: Super Contributor
timestamp: February 26, 2022, 12:00:06 am
content: According tothis tequipment.net page, it's 9V AC, 1A. This is consistent with thedatasheet, which labels the barrel jack an "AC transformer plugin". It's kind of odd though that they call the power supply "Universal 110V/220V". Unless there was a switch to switch the primary taps between 110V and 220V? Given the age, I would indeed expect an AC power supply (just a transformer) or a linear DC power supply.
Rigol DS5202CA USB - Page 1
Forum section: electronics / testgear

author: altmangf
author_rank: Newbie
timestamp: February 25, 2022, 12:34:25 am
content: I have a Rigol DS5202CA oscilloscope. It has a USB port but Rigol hasn’t updated the driver since 2006 and the available driver is 32 bit. I have been unable to install the driver on Windows 10. The scope had an optional GPIB and/or RS-232 port, but I do not have that hardware.Short of finding an old Windows XP machine, does anyone here know of a way of getting the USB to work so I can connect to Labview or Ultrascope?Also, the scope has a 50 pin connector on the back (Centronix I think). Does anyone know what it is for?Thanks!

author: jjoonathan
author_rank: Frequent Contributor
timestamp: February 25, 2022, 04:12:56 am
content: This is why I insist on Ethernet. Drivers suck. Hard. Every time.Have you tried a 32 bit VM in Virtualbox (do those even run anymore)?
BOONTON 4531 power meter hack - Page 1
Forum section: electronics / testgear

author: NiaDebesis
author_rank: Frequent Contributor
timestamp: February 25, 2022, 04:46:54 pm
content: Hi,I have one of these power meters, and since I have 2 sensors I would like to use them both.Is there any hack that is possibile to perform on these meters to unlock the second channel? Is hardware or software related?
HP5315A/B- HP5316A Option 6 Information Request - Page 1
Forum section: electronics / testgear

author: rfdes
author_rank: Regular Contributor
timestamp: February 24, 2022, 06:26:19 pm
content: Hi -The 5315/5316 Universal Counters sold by HP/Agilent back in the late 70s/80s supported an Offset/Normalizer Option (Opt 6) which allowed mathematical operations to be performed with the counter. The counter's service manual calls out a separate manual for this option. I was hoping someone in the group might know of the existence of the service manual or schematic for this option. I placed a request on the the 'HP-Agilent-Keysight-equipment@groups.io' forum but have had no luck. It appears this option did not sell well as the HP5316B manual shows the option was discontinued. The option required another piece of hardware that include thumb switches.Any help would be appreciated.ThanksJim

author: free_electron
author_rank: Super Contributor
timestamp: February 24, 2022, 07:26:36 pm
content: There's one on ebay right now.The boards A10 and A11 connect to the test connector. you need a new case assembly for this option ( it's not like this is two half rack units together. the side panels need to come off to run cables between the units and they get a new outer shell making this new instrument full width.

author: rfdes
author_rank: Regular Contributor
timestamp: February 25, 2022, 03:07:17 am
content: Quote from: free_electron on February 24, 2022, 07:26:36 pmSounds like you have experience with this setup. Do you have technical information on the A10/A11 cards?I searched and couldn't find the listing you mention. Would you please send me the link to the listing.Thanks
Mastech MS8218 OEM software - Page 1
Forum section: electronics / testgear

author: SN
author_rank: Newbie
timestamp: February 23, 2022, 09:47:47 pm
content: Hi everyone. New guy here.I'm looking for a copy of the Mastech DMM Viewer software for the MS8218. Sadly, I misplaced the CD. I tried contacting Mastech...no reply for the past couple weeks.Thanks in-advance.SN

author: Grandchuck
author_rank: Super Contributor
timestamp: February 24, 2022, 02:44:35 pm
content: Maybe you could use testcontroller:https://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimeters/

author: F64098
author_rank: Regular Contributor
timestamp: February 24, 2022, 07:44:26 pm
content: Hello,you can download it here:https://files2.elv.com/public/05/0544/054466/Internet/ms8218_setup.zipHTHFrank
Times Microwave OE5108 VNA Cal Kit - Page 1
Forum section: electronics / testgear

author: Bud
author_rank: Super Contributor
timestamp: February 23, 2022, 01:07:16 am
content: Does anyone have data / cal coefficients on this Times Microwave VNA 18GHz OSL cal kit, N-male model OE5108 ?Or perhaps offer to measure the S-Parameters for me in Canada ?I spoke with Times, they said the model is obsolete and they could not locate the data. Maybe they did not try hard.

author: TheSteve
author_rank: Unknown
timestamp: February 24, 2022, 04:57:13 am
content: What VNA did you want to use this kit with? I can measure it compared to a Maury Microwave 18 GHz N kit I have. I wish I could compare it to my ECAL but my N model only goes to 9 GHz(until I find a deal on an 18 GHz unit).

author: Bud
author_rank: Super Contributor
timestamp: February 24, 2022, 01:36:46 pm
content: At the moment i have 6 GHz set: 8753C + S-Parameters Trst Set with a doubler.

author: TheSteve
author_rank: Unknown
timestamp: February 24, 2022, 04:04:57 pm
content: As long as you're covering shipping we can give it a go if you want.The goal would be to save the measured values for the kit in touchstone format. We would then load those files into Metas VNA Tools(or others) and calculate the best fit correction factors. This would end in proper cal correction values in a format the 8753 can be loaded with.We can try doing it to 6 and 18 GHz. Depending on the performance of the kit it may or may not be possible to generate 18 GHz best fit correction values for HPAK equipment.A new thread detailing the process would probably be fun.

author: Bud
author_rank: Super Contributor
timestamp: February 24, 2022, 04:21:41 pm
content: Sure, I will send a PM to arrange the logistics.Many thanks!
SDM30XX, Input terminal protection limitation - Page 1
Forum section: electronics / testgear

author: knudch
author_rank: Regular Contributor
timestamp: November 04, 2021, 07:01:00 am
content: In the Quick Guide for the SDM3065X on page 6 is written:"2. Sampling (HISense and LOSense) terminalHISense and LOSense are used for 4-wire Resistancemeasurement. Two protection limitations are defined: HISense-LOSense protection limitation: 2000Vpk. LOSense-LOSense protection limitation: 2Vpk."Specialy the line LOSense-LOSense.......What does that mean ?

author: Kean
author_rank: Unknown
timestamp: November 04, 2021, 07:53:38 am
content: I would say that is a mistake and it should beLOSense-LOis limited to 2Vpk

author: knudch
author_rank: Regular Contributor
timestamp: November 04, 2021, 08:15:03 am
content: That was also my first thoughtBut that means it is only allowed to have 2Vpk between LOSense and LO ?In case you cross HISense and LOSense (Mistake) and more than 2Vpk HISense-LOSense will it then destroy the meter ?

author: knudch
author_rank: Regular Contributor
timestamp: November 04, 2021, 08:20:07 am
content: Keysight 34460 has 200Vp limitation between HISense and LOSense to any combination

author: knudch
author_rank: Regular Contributor
timestamp: November 04, 2021, 08:28:38 am
content: Rigol DM3068 has 0,5Vp limitation LOSense - LO !

author: knudch
author_rank: Regular Contributor
timestamp: February 24, 2022, 10:47:51 am
content: Finally I got an answeer from Siglent EuropeQuote:"I got the final feedback that our value should be like at the Keysight you are referring.The manual will be fixed soon."I understand it like this:"Keysight 34460 has 200Vp limitation between HISense and LOSense to any combination"We will see when the manual is updated
Adding voice control to Rigol MSO5000 oscilloscope - Page 1
Forum section: electronics / testgear

author: frankvh2
author_rank: Newbie
timestamp: February 23, 2022, 05:15:58 am
content: Wasn't sure where the best place to post this was - "Test Equipment" seemed right, but feel free to move or delete it if not.This is a module to provide voice control for the Rigol MSO5000 family of scopes. Tested on my MSO5072, but should work on any of the family. If both your hands are full holding scope probes, you can call "stop" for example to stop the scope. Or "single" or "run". Simple and surprisingly useful. It works by recognizing voice commands, then sending the appropriate SCPI command to the scope via its network interface.It's a simple DIY build. Uses three cheap little off-the-shelf boards you can buy on Aliexpress or eBay. If you have a 3D printer you can also print a nice enough little housing for it. Complete details are here:https://www.frankvh.com/oscilloscope-voice-control-using-esp32/

author: Noy
author_rank: Frequent Contributor
timestamp: February 23, 2022, 01:02:18 pm
content: Wooo very nice device :-)Was looking for something like this. Something which not needs a PI...Another approach was:https://github.com/patricksebastien/speech2scpiMaybe i will build your device as well..

author: tom66
author_rank: Super Contributor
timestamp: February 23, 2022, 03:12:46 pm
content: Cool device.

author: Hexley
author_rank: Regular Contributor
timestamp: February 23, 2022, 04:34:25 pm
content: Nicely done. Looks like a tidy solution with nicely integrated modules.For anyone with a Rigol scope other than the 5000 series, or with a Keysight 1000 - 4000 series, an alternate approach is provided here:https://www.eevblog.com/forum/testgear/diy-voice-control-for-keysight-1000-x-scopes/.One nice thing about Jim's design [which I have built and use frequently] is that it supports a flexible grammar so that any of its 15 or so supported functions can be invoked by several different command utterances. So, for example "time base 10 seconds per div" is the same as "horizontal scale 10 seconds per div". Neat trick. I wonder how complicated it would be to train the elechouse voice recognizer to handle that kind of flexible grammar?

author: thm_w
author_rank: Super Contributor
timestamp: February 23, 2022, 11:24:29 pm
content: Very cool.The Voice module is about $22. I think voice recognition could be done within the ESP32 as well, but it would take significant work:https://www.survivingwithandroid.com/esp32-tensorflow-micro-speech-i2s-external-microphone/https://www.aliexpress.com/item/1005003782550871.htmlThese are cheap but seem to have fixed commands?https://www.aliexpress.com/item/1005003129261277.html
HP54600 Series (54645D, 54602A, etc All channels stay at ground - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 23, 2022, 11:04:54 pm
content: I have two 54600 series scopes one a 54645D and a 54602A where all of the channels are fixed at ground. The buttons work for other functions but I can not select anything but ground. Has anyone seen this before?SamW3OHM
Bandwidth upgrade for Tektronix DPO2004B? - Page 1
Forum section: electronics / testgear

author: Khaveer
author_rank: Contributor
timestamp: February 17, 2022, 08:49:35 pm
content: Hello. I've purchased an extremely cheap NOS Tektronix DPO2004B scope. I know that there are better options out there, but it was only a bit more expensive than a Rigol 1054z and I prefer the Tek UI.Of course the first thing that came to my mind was to look for ways to unlock all the extra stuff. I found the thread about modules, but I couldn't find any verified information about the bandwidth. Are there any verified ways to upgrade it?

author: Drirr
author_rank: Regular Contributor
timestamp: February 18, 2022, 07:32:05 pm
content: Hi,Bandwidth is set by hardware. There is no way to upgrade bandwidth by software.internal photos:https://photos.app.goo.gl/U5wS5u7NrvdiB2XB8

author: Khaveer
author_rank: Contributor
timestamp: February 18, 2022, 08:21:37 pm
content: Quote from: Drirr on February 18, 2022, 07:32:05 pmThanks for the reply, but I'm not sure about that. I've disassembled the firmware and it turns out that there's a way to upgrade the model number like in the DPO/MSO3000 series:https://www.eevblog.com/forum/testgear/dpo3000-hacks/I was able to change it to 2024B and it passed the SPC. The 2ns timebase is now present. Now the issue is that I have to get a signal gen that's capable of producing 200 MHz to verify if it really works.The commands I used were:Code::PASSWORD INTEKRITY:SETMODELID 6

author: Drirr
author_rank: Regular Contributor
timestamp: February 23, 2022, 07:15:15 pm
content: Info about bandwidth modification is from our local TEK distribution. I believe that the hardware modification is necessary. Would be nice to check bandwidth.I am also owner of TEK2k , crippled to 70MHz.I can try to modify SW and check by HP83630AJesteś daleko od Brna?

author: MacIntoshCZ
author_rank: Regular Contributor
timestamp: February 23, 2022, 07:19:22 pm
content: Drirr90?

author: Hydrawerk
author_rank: Super Contributor
timestamp: February 23, 2022, 08:21:08 pm
content: Quote from: MacIntoshCZ on February 23, 2022, 07:19:22 pmProbably yes.
ITECH IT6300 Power Supply - Page 1
Forum section: electronics / testgear

author: kgrammatis
author_rank: Newbie
timestamp: November 29, 2015, 09:13:33 pm
content: I've been looking into purchasing a small form factor (limited bench space) 3 channel PSU for under $500. The ITECH 6300 line of power supplies may meet those needs and was wondering if anyone has had any experience with them?Take a look:http://www.itechate.com/en/product/conter71.htmThe IT6332A seems fantastic. It has three channels and seems to output 195 watts although I could be reading it wrong and it could actually be 375 watts.ch1: 0-5V @ 3Ach2: 0-60V @ 6Ach3: 0-60V @ 6AHere's the datasheet:http://www.itechate.com/Upload/File/20150806090744.pdfI e-mailed the manufacturer but haven't found a price quite yet, but I found a similar lesser powered model the IT6302 for $316 on aliexpress which gives me hope that I might be able to land this unit for less than $500. Here's a link:http://es.aliexpress.com/store/product/FREE-SHIPPING-ITECH-IT6302-Programmable-DC-Power-Supply/1727580_32521768681.htmlHas anyone had any experience with an ITECH? Would you recommend them? I know they are owned by BK precision and many BK precision devices are actually ITECH From what I've read many other manufacturers may use them as well. The Kiethley 2231A seem to be quite similar to the Itech IT6300 family of PSU's, just with a different button configuration. Could it be an ITECH?http://www.tek.com/sites/tek.com/files/media/media/resources/2231A%20PowerSupply_DataSheet_0.pdf

author: Git
author_rank: Contributor
timestamp: February 23, 2022, 05:01:05 pm
content: How did you get on with this power supply, it looks like what I want. By my arithmetic, 60*6 + 60*6 + 5*3 = 735W. If it is any less, then the full truth isn't being told somewhere. I have looking for a dual 60V 5A or 3A power supply for over a year, but the only ones I see (excepting the big boys) have specifications that are full of porkies. You have pointed the typical one. You see "Dual 60Volt 6A power supply!". In fact it turn out to be a dual 30V 3A psu, which you can series for 60V **OR** parallel for 6A. I am finding this with almost everything I look at. Please shout if you know a true dual 6V 5A psu, ie 360W + 360W = 720W.
Trigger options Agilent 54621A scope - Page 1
Forum section: electronics / testgear

author: Ricotjuh
author_rank: Newbie
timestamp: February 22, 2022, 08:13:55 am
content: I have a question about my Agilent 54621A scope. Manual:https://www.mit.bme.hu/system/files/oktatas/targyak/10878/Agilent_54622A_Oscilloscope.pdfAccording to the manual the following trigger options should be possible:• Edge trigger• Pulse Width (glitch) trigger• Pattern trigger• CAN (Controller Area Network) trigger• Duration trigger• I2C (Inter-IC bus) trigger• LIN (Local Interconnect Network)• Sequence trigger• SPI (Serial Peripheral Interface) trigger• TV trigger• USB (Universal Serial Bus) triggerThe last 8 mentioned can be reached via the "More" button.However, with my scope I only see the TV trigger, Sequence trigger, I2C (Inter-IC bus) trigger and the Duration trigger.See image below.But when I watch a video on Youtube of someone with the 54621A, I see that he does have more options as mentioned above.See images below.Does anyone have any idea if this is a setting, or a difference in the firmware? Which in itself would be strange since the manual describes that all models should have these trigger options.I would like to measure on CAN systems. So this feature seems useful to me. I'd love to hear your findings.Thanks in advance.

author: 1Ghz
author_rank: Unknown
timestamp: February 22, 2022, 08:33:06 am
content: Your oscilloscope may have old firmware.Update your firmware.Quote from: Release Notes

author: Ricotjuh
author_rank: Newbie
timestamp: February 22, 2022, 10:18:09 am
content: Thanks for the remark. Indeed it was. I have now updated the scope to version A.02.31 and now the functions are available.I am a happy person again. Thank you