hybridfree/eevblog-posts huggingface dataset:
CY7C68013-based Bus Pirate and Logic Generator - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: June 01, 2018, 04:28:19 am
content: I've seen low-cost development boards based on a Cypress CY7C68013 (FX2) which can be used as a logic analyser, but how about using these boards as a logic generator (with a continuous streaming function which makes use of the FIFO - can also be used as a waveform generator up to (in theory) 48 MHz @ 8 bit output/24 MHz @ 16 bit output - possibly only an X^2 fraction of that) and even as a high speed Bus Pirate?The Cypress FX2 has the ability to load "soft" firmware over USB via a vendor-defined command in the I2C EEPROM.Also, I've read the Hantek 6022BL (based on an FX2) samples at 48 MS/s (one analog channel; half for both channels) and the 16 bit logic analyser operates at up to 24 MHz; therefore, the 6022BL most likely has a continuous streaming function.

author: abyrvalg
author_rank: Frequent Contributor
timestamp: June 02, 2018, 10:01:47 am
content: Believe me, many people here are full of brilliant ideas but are just too busy implementing some of them.Why not create a github project? Start by implementing the part most interesting for you, maybe someone will catch up with the rest.Btw, any progress with Hantek 4032L beyond ideas?

author: hugo
author_rank: Regular Contributor
timestamp: June 02, 2018, 10:59:14 am
content: There you go:PWM LogicA PWM generator using the original Saleae Logic as output device.https://github.com/joosthaverkort/PWMLogichttps://hackaday.com/2011/05/24/turn-a-logic-analyzer-into-a-signal-generator-using-only-software/

author: Gyro
author_rank: Super Contributor
timestamp: June 02, 2018, 08:56:04 pm
content: Note that you can also use PWM logic on those low cost 8-bit LA clonesbutyou need to do a little surgery to switch the internal buffer direction to output (It's an HCT245). The original 8-bit Saleae didn't have the buffer, the inputs went straight into the CY7C68013.Ideally you would make the buffer direction switch (or link) selectable.
Rigol MSO1074Plus vertical issue - Page 1
Forum section: electronics / testgear

author: Professzore
author_rank: Contributor
timestamp: June 01, 2018, 09:46:22 am
content: Dear All,Recently I've experienced an unusual behaviour on my Rigol MSO1074Plus Scope. A set of very basic settings, two measurements have been done one after another. First is at 500mV/div vertical and the second with 1V/div vertical. It is clearly visible that the second measurement is completely useless and lacks anything important for debugging/inspection. I experience the same with anything over 1 V/div setting. I've also tried many other settings (timebase, Display, Acquisition etc.). Same is true for all four channels with all available probes.All hints are welcome and highly appreciated. Thanks in advance!Yours Sincerely,Tamás

author: tautech
author_rank: Super Contributor
timestamp: June 01, 2018, 09:55:20 am
content: Oh no not another one !It's normal.Your waveform must be completely on the display, or within the max offset listed in the scope specs.The channel 1 0V level indicator pointing down shows the level is clearly off the display.Get it back onto the display and normal programming will return.

author: JPortici
author_rank: Super Contributor
timestamp: June 01, 2018, 10:05:54 am
content: Quote from: tautech on June 01, 2018, 09:55:20 amsuggestion for the siglent development team: add an OVERLOAD label in future models (or updates, if they have a way to detect the condition)

author: Professzore
author_rank: Contributor
timestamp: June 01, 2018, 10:41:17 am
content: Quote from: tautech on June 01, 2018, 09:55:20 amThanks for the suggestion!Done it, please, take a look at the results!Ch1 (yellow) completely on the screen, 0 V offset, 5V/div.Ch2 (blue) -12 V offset, 200mV/div.Specs: max offsets at 1× probe ratio are+/-2 Vfrom 1 mV/div to 499 mV/div,+/- 100 Vfrom 500 mV to 100 V/div.Ch1 is within the accepted maximum offset (no offset) and shows corrupt waveform,Ch2 is way off the maximum accepted offset and shows the expected waveform.I am slightly confused.

author: 2N3055
author_rank: Super Contributor
timestamp: June 01, 2018, 10:39:50 pm
content: Quote from: Professzore on June 01, 2018, 10:41:17 amNo, CH1 is within specifications and shows GOOD waveform.CH2 shows scope's input chanel overdrive recovery oscilations...That 2V pulse would be visible on CH1 if existed....Quote from: JPortici on June 01, 2018, 10:05:54 amSuggestion for ALL SCOPE manufacturers....

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: June 02, 2018, 12:21:36 am
content: https://www.eevblog.com/forum/testgear/siglent-technical-support-join-in-eevblog/msg1531802/#msg1531802Excellent explanation of what can happen when you overdrive the inputs on a scope by forum member Performa01
LCD display for an IFR1500 - Page 1
Forum section: electronics / testgear

author: ernemo
author_rank: Newbie
timestamp: February 18, 2018, 12:25:49 pm
content: Hello! I've bought a second hand IFR1500 but it has a faulty display (there are some incompleted segments). I've already cleaned the conductive rubber but without any result.Given that nobody sells its spare parts anymore, I would like to know if there are any other solutions to repair it or if anyone has a broken device but with a working display to sell. Thanks

author: tswenson
author_rank: Newbie
timestamp: June 02, 2018, 01:39:36 pm
content: Hi I have an 1500 also mine is working and I have a parts unit also. I would be very interested in a LCD display for my IFR 1500. Shoot me an emailwith any questions or comments about the ifr 1500 and LCD display. tswenson001@new.rr.com Tom
Tek THS720 scope bad screen - Page 1
Forum section: electronics / testgear

author: moby
author_rank: Contributor
timestamp: May 10, 2018, 09:01:24 pm
content: After a year of sitting in the bag, I pulled out the THS720 for a job - it appears to have suffered macular degeneration - a big circular area on the middle of the screen which has gone fuzzy and unreadable. Trolling back through past posts I found a discussion where someone fixed this by replacing the polarising filters. Unfortunately this is not the case for this LCD - the faulty area lies within the glass sandwich. Deciding I needed a new screen I bought something advertised as a LM32P10/LM32P101 on ebay. The Tek uses an LM32P10, what I received was an LM32P101. The screen does not work. Does anyone know if there is any incompatibility between the 10 and the 101 (they certainly look the same) or have I been simply sold a bad screen. The seller showed a picture of one of his screens in a THS7*0 but not turned on.M

author: moby
author_rank: Contributor
timestamp: June 02, 2018, 12:14:32 am
content: I can now confirm absolutely that LM32P101 LCD screens WILL NOT work on THS720 scopes.These are not compatible with LM32P10 screens and the many offerings of LM32P10/LM32P101 screens on ebay are bogus.The one good point of this sorry saga is that the Chinese vendor I bought this thing off refunded my money (incl freight) andpaid return freight.M
Service manual for Lutron FC-2500A frequency counter - Page 1
Forum section: electronics / testgear

author: 4x1md
author_rank: Regular Contributor
timestamp: June 01, 2018, 04:46:54 pm
content: I bought a used Lutron FC-2500A frequency counter from eBay. Its channel B input was faulty and I repaired it. Now I'd like to align it to get a better precision and I need the service manual or at least its schematics.It was also sold as BK Precision 1875. I contacted both Lutron and BK Precision and they both refused to provide the service manual.Does anybody have the service manual I need?
IDSO1070a linux wine - Page 1
Forum section: electronics / testgear

author: EinHexenMeister
author_rank: Newbie
timestamp: August 23, 2017, 05:46:42 am
content: friends :i have this new hantek idso1070a which connects on wifi with my android tablet or pc, as well as via usbwhat i noticed was that for the usb mode i didn't need to install a win 10 driver and at the end i got a short flashing message about a new serial port connected "COM7"does this mean that it connects and communicates via a serial link in usb modeor is the driver the same as for the 4 channel dso3000if yes, would the windows app run maybe in linux on wine and does wine support a serial channelthe other thought is the wifi mode ... similar to above, would it run in linux on wine and would wifi be supporter under wine as well ... udp and tcp are the same regardless of the deviceor would it use some sort of serial over wifi in case this existsi'm more of a hardware firmware guy and i'm not that good with systems issues, despite that i run all my development in kubuntui have to say, that the $ 150 hantek dso1070a seems to be a really nice oscilloscope for most of my use cases and for me a small footprint countsi'm mostly operating under 1 MHz with my embedded issues and if it would exceed the bandwidth i can always use my hp or tektronixdual monitors, keyboard and mouse, the hardware i'm working on to test my firmware, i don't have much room left for scopes, etc ... there is always room for the nexus 7 or a small portion on one of the monitors, except i run linux on themthanks and cheers EinHexenMeister

author: spblinux
author_rank: Newbie
timestamp: June 01, 2018, 04:47:23 pm
content: Just got an IDSO1070a oscilloscope. WIFI-mode works fine under wine (1.8.7) in debian 9 (stretch).Download pc software from hantek.com (unzip, mount iso, run windows/IDSO1070-Installer-1.0.21.exe with wine, ignore error about driver installation). Connect with linux to wifi network created by IDSO1070a oscilloscope.Code:wine $HOME/.wine/drive_c/Program\ Files/IDSO-1070/IDSO1070.exeInside IDSO application choose WIFI in menu File / Connect Type.Have fun,spblinuxEdit: posted an answer 10 months after previous post because this topic shows up prominently in google search about linux and this scope
34401A, calibration, Sacramento area? - Page 1
Forum section: electronics / testgear

author: sbixby
author_rank: Newbie
timestamp: June 01, 2018, 11:34:51 pm
content: Hi from a new member.I'm pretty much a novice in this field/hobby, but I've managed to find a few bits of test equipment at reasonable costs, including an Agilent 34401A purchased at a surplus shop awhile ago. I've pulled it out of storage and now I'm curious about getting it calibrated to factory specs, and using it as a reference for my other bits and pieces of test gear. Comparing to several handheld DMMs, I think this unit is roughly 10mv different in the 3-30v range, although I have no idea if it's more or less accurate than what I compared it toSo, any suggestions about how to do this, with these "constraints" in mind?-- I don't need or want certificates, I'd just like to know the unit is decently close to factory specs, if it's serviceable to that level.-- I'd love to find someone in the Sacramento area to take it to.-- I'm willing to pay some reasonable amount for this, but I can't justify a whole lot.For my hobby purposes I probably don't need 6 1/2 digit resolution, but it would be nice to have something pretty close to compare other things to.Thanks for reading.

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: June 02, 2018, 12:19:09 am
content: Welcome!I have recently moved to Davis.If you drop by you can compare your equipment to a recently calibrated Keithley 2001. For standards I have a Fluke 731b and a DMMCheckPlus in addition there are various high precision resistors.I'm not too interested in calibrating AC, so its just the DMMCheck in that area.PM me if interested.(To other folks--no this is not a calibration service of any kind...I hope that is clear. Just informal volt-nuttery.)Randall

author: sbixby
author_rank: Newbie
timestamp: June 02, 2018, 04:36:03 am
content: Thank you, Randall.... I might take you up on it!I have another avenue of exploration open too, friend-of-a-friend who works at an unnamed test equipment company.
Insulation multimeter  - Page 1
Forum section: electronics / testgear

author: Alster
author_rank: Newbie
timestamp: May 31, 2018, 01:39:53 pm
content: Hi. Im looking to replace my insulation tester and would like an insulation multimeter. I’ve pretty much narrowed it down to the Fluke 1587fc or the Brymen BM878. The Brymen looks a better meter for me as it does the 200ma earth bond test down to .001 ohms but does anyone on here own one as I’m worried about the quality as it’s considerably cheaper than the Fluke! Just to say i do domestic appliance repairs ( washing machines ovens etc. ) and like top quality equipment. Thanks in advance Alster

author: Fungus
author_rank: Super Contributor
timestamp: May 31, 2018, 02:05:17 pm
content: No worries there. Brymen are top quality, easily as good as Flukes.(but half the price)

author: Alster
author_rank: Newbie
timestamp: May 31, 2018, 03:28:36 pm
content: Great!! That’s just what i was hoping to hear. Thanks,Alster
Unipolar uCurrent mod possible? - Page 1
Forum section: electronics / testgear

author: EarthLord
author_rank: Contributor
timestamp: May 31, 2018, 06:36:39 am
content: Greetings all,I'm planning to do long-term battery current draw measurements with uCurrent. For this I would like to use a uCurrent to measure the current and log it with a Teensy 3.5 to store the sampled ADC values in its microSD card. What would be convenient is having the same battery supply power both the uCurrent and Teensy. And since the current flow would be unidirectional, I am planning to do the following steps:Remove R10 resistor of 270 Ohm which connects the output of the LM321 to the virtual groundShort the virtual ground point with the battery groundWill there be any issues with such a configuration? Thanks.
Fluke 189 inoperable with fuse but works without  - Page 1
Forum section: electronics / testgear

author: zaf_uom
author_rank: Newbie
timestamp: May 29, 2018, 05:53:49 pm
content: Hello,As title says, my flue 189 does not work when I have the fuses on. If I put the voltage fuse in it, the meter 'thinks' that it is measuring current and I get the incessant short beeps. When I remove both fuses, it works flawlessly.Does anyone have any pointer on how to debug the meter?Thanks and appreciate all the help.

author: ModemHead
author_rank: Frequent Contributor
timestamp: May 29, 2018, 08:02:57 pm
content: If you look inside the input jacks you will find there are two separate contacts. When a plug is inserted in the jack, those contacts are bridged. This allows the meter to detect when a plug is inserted into one of the dedicated current jacks. If the function selector is not in a current-measuring position, then the meter beeps and displays "LEAdS".The top halves of the contacts are connected to the meter's internal ground via the fuses. The bottom halves lead to microprocessor inputs, with pull-up resistors. Because these inputs must withstand the meter's full rated voltage, they have a large series resistance, and thus have *very* weak pull-ups. It only takes a small amount of moisture, dirt, grease, or whatnot to set off the lead alarm.Clean the A and mA jacks with strong isopropyl alcohol and some cotton swabs and/or pipe cleaners. Allow to dry thoroughly because the residual alcohol can set off the alarm as well.Hopefully that will clear up your problem.

author: zaf_uom
author_rank: Newbie
timestamp: May 31, 2018, 02:33:04 am
content: Thanks a lot for your well detailed answer. I tried cleaning the unit with propanol but that did not do the trick. I went a little more aggressive with acetone but there was no improvement in the functionality of the meter. I looked inside the terminals with a magnifying lens and it appears that the dirt that was originally there is pretty much gone.Other than cleaning the terminals, is there a check that I can do by testing different components or the resistance of the half-terminals or some other things?I thank you for taking the time to answe my questions.Best.

author: retiredcaps
author_rank: Super Contributor
timestamp: May 31, 2018, 03:26:07 am
content: Quote from: zaf_uom on May 31, 2018, 02:33:04 amSeehttps://www.eevblog.com/forum/repair/fluke-189-teardown-repair/
BK Precision 9130 power supply problem / troubleshoot - Page 1
Forum section: electronics / testgear

author: epiflow
author_rank: Contributor
timestamp: May 30, 2018, 12:52:17 am
content: Hello,I have two BK Precision 9130 power supplies that, upon power up, gets stuck in the "SYSTEM TEST, PLEASE WAIT!" phase. Has anyone else had or know of this problem and how to fix it?link to model and manual:https://bkpmedia.s3.amazonaws.com/downloads/manuals/en-us/9130_manual.pdfRyan

author: Kean
author_rank: Unknown
timestamp: May 30, 2018, 04:20:01 pm
content: Yes, I've got one of these that I bought in 2009. I recall a very similar issue, and I fixed it by replacing a bunch of the electrolytic caps that had dried out or leaked.Since then it has started playing up again, so has ended up on the shelf for future repair. Really weird behaviour - something like channel 2 would only come on if channel 1 was enabled, and then would actually display the current from channel 3, but voltage from channel 1. I'm wondering if there is some damage from the leaked capacitors that I missed in the previous repair. Or some caps I didn't replace have sinced leaked.From memory it was nicely built, but because it is compact it was a bit of a pain to work on. Power supplies often are though! I actually quite liked its UI when it was working.I've attached some internal photos for anyone interested.
TEA Proverb- - Page 1
Forum section: electronics / testgear

author: GEOelectronics
author_rank: Regular Contributor
timestamp: May 29, 2018, 02:31:09 pm
content: "I felt sorry for myself because I had no HP 3458A DMM, until I met a man who had no VOM."T.E. Junkie

author: kj7e
author_rank: Frequent Contributor
timestamp: May 29, 2018, 08:28:51 pm
content: Real knowledge is to know the extent of one's uncertainties.- Metrologist Confucius

author: Gregg
author_rank: Super Contributor
timestamp: May 29, 2018, 08:55:48 pm
content: Not a proverb; just an observationJoin the EEVblog TEA group; they will help you with your problem:Help point out test equipment that you don’t have but suddenly NEEDHelp by pointing out sources of obscure test equipment add-on modules and accessories to make your test systems complete (if that is even possible)Help by setting the bar high for sheer number of test instrumentsHelp you find excuses for why you need more, more, moreHelp you answer the inevitable spousal question, “What do you need that for?”Help guide you through the labyrinths of the test equipment rabbit holeFor your foray into this great camaraderie, just post your problem to the TEA thread of the EEVblog where you will find lots of kindred spirits to help you feel better about your addiction
Fluke 29/79-2 and 87-3 Fuse Question - Page 1
Forum section: electronics / testgear

author: ogdento
author_rank: Regular Contributor
timestamp: May 22, 2018, 08:34:43 pm
content: Hi folks,I have Fluke 29, 79-2 and 87-3 meters... the 79-2 and 29 use the Bussman 1A and 15A fuses, whereas the 87-3 uses the Bussmann 0.44A and 11A fuses.The 29/79-2 current ranges are 40mA and 10A, and the 87-3 ranges are 400mA and 10A. I don't really understand why the 29/79-2 fuse specs are so much higher than the meter ranges allow, but that's getting off topic.Newark, Digikey, etc sell 5-packs of Fluke fuses... is there any safety hazard in using the 87-3 spec'd fuses (0.44A and 11A) in the 29/79-2?I did see a Fluke note saying not to use the 15A 29/79-2 fuse in the 87-3 (which makes sense to me), but I couldn't come up with any reason the 87-3 fuses wouldn't be ok in the 29/79-2.Thanks

author: ModemHead
author_rank: Frequent Contributor
timestamp: May 27, 2018, 03:23:04 pm
content: The 11A/0.44A fuses are kind of a defacto standard nowadays for multimeter fuses, so you're good there. The specs for the 79/29-II meters allow for a 30-second overload of 20A on the 10A range. The 11A fuse might blow in that situation, whereas the 15A wouldn't. Other than that, and without diving into the spec sheets, I think it would be OK to sub the fuses.

author: Fungus
author_rank: Super Contributor
timestamp: May 27, 2018, 03:57:09 pm
content: Quote from: ogdento on May 22, 2018, 08:34:43 pmReplacing with a lower breaking current should be OK.

author: ogdento
author_rank: Regular Contributor
timestamp: May 29, 2018, 06:22:57 pm
content: awesome, thanks for the info guys.ModemHead I can't tell you how many times I've checked out the awesome stuff you've done with Flukes... love your site!
lecroy scope remote control, missing commands - Page 1
Forum section: electronics / testgear

author: aguevel
author_rank: Newbie
timestamp: June 05, 2018, 08:35:15 am
content: Hi everyone !I'm currently using a lecroy WaveRunner6030 oscilloscope in remote control mode. It's working quite good with most of the commands I found in the remote control manual, but I met a few issues :- Multi-Zoom command does not work- I could not fin any command to switch a trace from a grid to another (equivalent of next grid button) in dual grid mode for example- Also met issues with zoom parameters command : HMAG, HPOS ... not understood by the scopeThanks if you have any informations about these !
sensitive noise / sound level meter to measure low sounds - Page 1
Forum section: electronics / testgear

author: dogman
author_rank: Contributor
timestamp: May 28, 2018, 05:44:56 pm
content: HiNot sure where to askI'm looking for a noise level meter to measure noise levels of PCs/laptops. I want it to be somewhat accurate the least, so no $10 meters from amazon I guessAlso, it should go down to 20db or soAny clue?Thanks in advance, much appreciated

author: Andreas
author_rank: Super Contributor
timestamp: May 28, 2018, 06:16:39 pm
content: here is a article about noise measurements. (sorry german only).https://www.heise.de/ct/artikel/c-t-Labs-Krach-genau-messen-1960778.htmlhttps://www.heise.de/ct/hotline/Laerm-messen-297358.html

author: Richard Crowley
author_rank: Super Contributor
timestamp: May 28, 2018, 06:28:49 pm
content: There are many sound level meters on Amazon at a wide range of price-points.However they virtually all show 30dB as their lower limit.Perhaps because you need a quite specialized environment to expect to measure anything below 30dB.Such low-levels typically require an anechoic chamber and much more costly test gear.
Looking for service manual Fluke 99B Scopemeter Series II 100 MHz - Page 1
Forum section: electronics / testgear

author: Rolo
author_rank: Regular Contributor
timestamp: May 27, 2018, 12:34:01 pm
content: I'm looking for service manual for the Fluke 99B Scopemeter, Series II 100 MHz. Google is not helping very much, got some hits but they are dead links. Seems a rare item. Not strange knowing the meter is ~20 years old. But you never know. Thanks!

author: Fungus
author_rank: Super Contributor
timestamp: May 27, 2018, 12:39:52 pm
content: I googled "fluke 99b scopemeter manual" and got many hits.eg.https://www.manualslib.com/manual/397451/Fluke-105b.html#product-99B

author: Rolo
author_rank: Regular Contributor
timestamp: May 27, 2018, 01:07:19 pm
content: Thanks for your reply but this is the user manual, I'm looking for the service manual. I have the original user manual book en as PDF file.

author: Fungus
author_rank: Super Contributor
timestamp: May 27, 2018, 02:04:54 pm
content: Oh, duh!I had a google for the service manual but it's not there.(butdamn, there's a lot of fake websites trying to get you to sign up to get it...)

author: Candid
author_rank: Regular Contributor
timestamp: May 27, 2018, 09:06:27 pm
content: I too could not finde a 99b specific one but this may help you:http://bee.mif.pg.gda.pl/ciasteczkowypotwor/Philips/pm93_95_97_fluke_93_95_97.pdfAlternative link:http://www.opweb.de/en/manual.php?file=FlukePhilips-521.pdfIt's to big to attach here.

author: Rolo
author_rank: Regular Contributor
timestamp: May 28, 2018, 02:30:37 pm
content: Thanks for all info. Enough to read for now.
Tektronix 11403 probe setup - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: May 26, 2018, 12:32:15 am
content: I recently acquired a Tektronix 11403 scope. Due to lack of my experience with something this advanced, I'm having some issues. I hope someone can help me out. I only have regular TEK probes without any intelligence and third party probes.1) Figured out that test signal output is usually disabled. I have to be in certain mode to enable them. One of them is deskew in probes menu.2) I go into deskew menu and run the process. It always end with red banner that reads: "Probe cal complete. Deskew FAILED. Perform probe compensation procedure".I'm thinking this is so because it's a third party probe. I think the intelligent probe that typically comes with this scope will have some intelligence feature to automate this. Is it right that this is an expected behavior with normal probes? Manual does not explain this very well and it only talks about using TEK probes.

author: tautech
author_rank: Super Contributor
timestamp: May 26, 2018, 12:42:39 am
content: Deskew is for adjusting/nulling the propagation delaysbetween2 probes so won't complete with a single probe.They don't look to have anything but plain BNC's so any probe should work but I could be wrong.

author: tkamiya
author_rank: Super Contributor
timestamp: May 26, 2018, 01:05:38 am
content: Probe connector IS a BNC but it has terminals/ports/PCB are around it. It encircles the BNC and has 4 individual connections.I saw some video clip about doing this with 2 probes. But TEK manual only talks about single probe. I think what it is saying is doing this relative to the test signal. It's all new to me.

author: z80tw
author_rank: Contributor
timestamp: May 26, 2018, 04:53:51 pm
content: I tried tek P6137 (400MHZ) and one cheap 60Mhz probe(black probe) on my Tek 11403A,both passed the probe (and deskew) calibration.

author: tkamiya
author_rank: Super Contributor
timestamp: May 26, 2018, 05:56:00 pm
content: Thank you. Then there is something going on with my scope then. I will get with my cal lab folks and see what they can do for me. Thank you for taking your time to do this and post pictures.

author: tkamiya
author_rank: Super Contributor
timestamp: May 26, 2018, 06:35:50 pm
content: By the way, HOW did you take such a nice, clear and crisp picture of a display? Mine has a CRT and I could never do it like that with mine.

author: z80tw
author_rank: Contributor
timestamp: May 28, 2018, 01:18:43 am
content: What you need is a screen capture software of Tek 11000 series scope(for 11801x/11402x/11403x/csa803x/DSA602x,RS232 interface) and a RS232 cable( 9 pins to 25 pins).https://www.eevblog.com/forum/projects/tektronix-csa803-screen-capture-%28compacted-binary%29/msg1333147/#msg1333147I can't use this Tek Screen Snap screen capture software because my PC OS is WinXP thus I wrote my own screen capture software,but it can only run under WinXP (or earlier OS) and it's not completed yet.
HP54540A and HP54542A  possible conversion? - Page 1
Forum section: electronics / testgear

author: fisafisa
author_rank: Regular Contributor
timestamp: May 26, 2018, 11:26:05 am
content: Hi.After having successfully converted all my HP16533A to 16534A and my 16750A to 16752A I am left wondering if I could upgrade my old scopewhich appears to use the same components as the 16533/16534..The service manual is the same, the block schematic too. Spare parts the same.... 1NB7-8353... Same firmware T3.33Sounds to me that the difference may be something very simple as some resistors..Anybody with photos of a 54542 motherboard?Cheers

author: fisafisa
author_rank: Regular Contributor
timestamp: May 26, 2018, 08:35:10 pm
content: In fact a conversion was possible under the code name 54540U.Not much information around about that.
TLA 704 Logic Analyzer Help - Page 1
Forum section: electronics / testgear

author: Dave.V
author_rank: Newbie
timestamp: May 24, 2018, 04:17:38 am
content: I'm a newbie to blogs (not electronics) and I need some help. I am resurrecting a Tektronix TLA 704 Logic Analyzer that I picked up cheap. It had a dead hard drive and RTC chip. I have installed a new 40 GB HDD, replaced the Dallas DS12887 RTC chip with a DS12885 and upgraded the RAM to a whopping 64 MB, otherwise I'm looking to keep it pretty much "stock". I was able to get the OS installed (Windows 98SE) and the logic analyzer software is installed and working. My problem is that I need to calibrate the TLA 7D1 DSO module and Tektronix did not include the TALCAL program in their archived Version 3.2 of the software. I have looked everywhere on the WWW that I can think of and cannot find it. Does anyone have the Version 3.2 software CD? Actually, all that I need are three files -- TLACAL.exe, TLACAL.hex and TLACAL.chm (the help file). If you have a TLA 704 with version 3.2 installed they will be in the TLA 700 System folder. Any help would be greatly appreciated!

author: RomDump
author_rank: Regular Contributor
timestamp: May 25, 2018, 02:58:31 am
content: Quote from: Dave.V on May 24, 2018, 04:17:38 amDid you try and contact Tektronix Support? Sometimes they can be helpful and give you the program.

author: Dave.V
author_rank: Newbie
timestamp: May 26, 2018, 06:14:41 pm
content: Thanks RomDump, I did try Tektronix Support. Their only solution was to offer the TLACAL "user manual" on CD-ROM for $244.00. They could not verify that the software was included!As this is about twice what I paid for the analyzer and with no assurance that the software was even included I declined.

author: nctnico
author_rank: Super Contributor
timestamp: May 26, 2018, 06:18:24 pm
content: Try this:https://doc.xdevs.com/doc/Tektronix/TLA/TLACALSetup_v6.0.213.0.zip

author: Dave.V
author_rank: Newbie
timestamp: May 26, 2018, 06:23:51 pm
content: Thanks nctnico, I had tried that solution (should have mentioned it in the first post). Problem is Version 6.0.213.0 will not install/run in a Windows 98 environment.I think I need the Version 3.2 files.
Suggestion needed regarding differential scope probe - Page 1
Forum section: electronics / testgear

author: SHARANYA
author_rank: Contributor
timestamp: May 26, 2018, 03:52:21 pm
content: Hi allI am currently working on a project where it is needed to attach my scope probes to 220v AC(to watch Triac angle firing).Previously i was planning to buy a Pintek-DP25 & called my supplier.He told me to buy GWInstek GDP-025 instead of the Pintek.I am unable to find any kind of review/usage video regarding GDP-025 on the Net.Is this scope probe any good?Also,I have a rigol DS1102E scope.Can I attach the GDP-025 to my scope?

author: Kean
author_rank: Unknown
timestamp: May 26, 2018, 04:48:12 pm
content: As far as I know, the GWInstek GDP-025 and Pintek DP-25 are the same. A quick search shows that seems to be the feeling of others too - e.g. seehttps://www.eevblog.com/forum/testgear/high-voltage-probes-for-rectfied-220v/msg374643/#msg374643Further down in that topic is some interesting info about Pintek.I have the Pintek DP-25, and in fact have been using it this evening to probe a high voltage ultrasonic driver. I got it a few years back fromhttps://www.globalmediapro.com/and it was a lot cheaper than the other local suppliers I looked at, but that will depend on shipping to your location. Some websites show the DP-25 is discontinued (e.g RS), but that is likely just because *they* no longer stock it.If I was buying a new one today, I'd most likely get one with higher bandwith. e.g the HVP70 from Davehttps://www.eevblog.com/product/hvp70/which seems pretty good. But to be honest, I use it so rarely I probably couldn't justify it.

author: PA4TIM
author_rank: Super Contributor
timestamp: May 26, 2018, 04:54:33 pm
content: I have this one.https://www.picotech.com/accessories/high-voltage-active-differential-probes/25-mhz-1400-v-differential-probeI think there is a lot of relabeling going on. My Pico looks identical to the Fluke o fa friend.

author: nctnico
author_rank: Super Contributor
timestamp: May 26, 2018, 05:08:11 pm
content: Quote from: SHARANYA on May 26, 2018, 03:52:21 pmI'd get the differential probes from MicSig. They are cheaper, have more bandwidth and according to my testing have a flatter frequency response.More info in this thread:https://www.eevblog.com/forum/testgear/new-low-cost-($170)-100mhz-differential-scope-probe-from-micsig/msg1254420/#msg1254420

author: BillB
author_rank: Unknown
timestamp: May 26, 2018, 05:44:31 pm
content: +1 for the MicSig. With a $140 street price, they probably offer the best bang/buck.

author: SHARANYA
author_rank: Contributor
timestamp: May 26, 2018, 06:12:24 pm
content: Although the MicSig probe is cheap,but in India,we have to pay a huge charge for individual customs clearance.That's why I was going for the GWInstek GDP-025 probe because the supplier directly imports & deals with the customs.
HP 53131A & 53132A Power Off Mod - Page 1
Forum section: electronics / testgear

author: wholder
author_rank: Regular Contributor
timestamp: May 20, 2018, 04:22:12 am
content: I recently purchased a used HP 53131A Universal Counter and was surprised to see that it's designed to stay partially powered on, with the fan running, even when the power switch is in standby. The manual says this is for timebase temperature stability but, since I plan to use with my Trimble Thunderbolt as the 10 MHz clock reference source, I don't really need this feature. So, I came up with a non-destructive way to modify the 53131A to have a true power off switch. For more details, see my article at:https://sites.google.com/site/wayneholder/hp-53131a-power-off-modWayne

author: ArthurDent
author_rank: Super Contributor
timestamp: May 26, 2018, 05:55:26 pm
content: On my HP 53132A I just mounted a toggle switch in one of the unused holes for the back panel BNC input connectors and wired the switch in series with the power connector. The front panel power/standby switch is unmodified and works as usual and if I want to completely power down I can reach around to the back and turn the added switch to the off position. Much easier than the other modifications I've seen and is easily removable if you want to sell the unit unmodified.
SSD for Tektronix TDS7054 - Page 1
Forum section: electronics / testgear

author: Electrole
author_rank: Contributor
timestamp: May 26, 2018, 07:19:29 am
content: Hi! I got a Tektronix TDS7054 oscilloscope in great shape the other day, with 2M option, serial prefix B020...I does boot rather slowly, so I'm considering to replace the HDD with an SSD. Going through the posts here, it seems that some of you may have experience with that. What would be the right steps so that I do not turn the TDS7054 into an oversize paperweight?Cheers...
Fluke 87V showing strange values for smd Tantalum caps - Page 1
Forum section: electronics / testgear

author: SHARANYA
author_rank: Contributor
timestamp: May 23, 2018, 09:53:53 am
content: HiI am using my Fluke 87V from past two years without any problem.I recently bought some solid smd tantalum caps & while testing the value,i found something weird...These are 10uF tantalum smd caps(case - A/3216/1206).This is the link for the capS -https://www.sunrom.com/p/10uf-25v-tantalum.The problem is ,whenever i am testing the caps(I bought two of them),the fluke is showing nearly 4.66uF.But for all the other caps(Electrolytic/MLCC/Polyester/Normal Tantalum) I am testing,Fluke is returning proper value within spec.I also took image of the caps & zoom them & found that they are rated for 10uF.(I suspected that 4.7uF sent instead of 10uF).What can be the cause?

author: Fungus
author_rank: Super Contributor
timestamp: May 23, 2018, 11:14:17 am
content: Have you measured them with anything else to verify there wasn't a mixup at the capacitor factory?

author: BravoV
author_rank: Super Contributor
timestamp: May 23, 2018, 11:21:02 am
content: He bought only two pieces no brand caps from this so called "SUNROM", quite questionable imo.Buy from different "reputable" brand and genuine one of course.Also 4.66 uF is close to 4.7 uF ... relabelled ?

author: SHARANYA
author_rank: Contributor
timestamp: May 23, 2018, 06:57:34 pm
content: I am suspecting that somehow they labelled 4.7uF caps as 10uF.I mailed the website admins about the incidents with photographs.Waiting for the reply!By the way,i am uploading the pics here...

author: SHARANYA
author_rank: Contributor
timestamp: May 24, 2018, 04:58:40 pm
content: Ok,i got reply from the supplier.The caps were made of AVX.They also tested random caps & found the same inside the roll.They are also in doubt regarding the same.I am attaching a screenshot of the mail sent by them..
Tektronix SG 503 - works but can't shift range - Page 1
Forum section: electronics / testgear

author: ajhalls
author_rank: Newbie
timestamp: May 22, 2018, 03:03:52 pm
content: I just got a Tektronix SG 503 250MHz pulse generator, but when I adjust the range selector down to anything but 250MHz it doesn't work, so the lowest I can get is about 115MHz. I have tried pulling and reseating all the IC chips but it still doesn't help. Anything else I should try on this so I can use it with a 100MHz scope?Alan

author: Bhannis
author_rank: Newbie
timestamp: May 24, 2018, 07:07:39 am
content: ajhallsThe signal generator SG503 is a leveled signal generator with 50kHz to 250MHz range.The oscillator part is divided in two main circuits. One for the 50kHz to 100MHz and one for the 100MHz to 250MHz. I suspect the Q130 (151-0211-xx og 151-0451-xx) transistor in the 50kHz to 100MHz range to be blown. it is possible to find replacement but try swapping the Q140 and Q130 transistors first to check if it is the transistor. These transistors can be found on the "B" side of the generator (right side looking at the front) and are the two TO-39 transistors with heat sink. These transistors are not soldered and can be pulled and out and inserted carefully.The swap will give you the 50kHz-100MHz and your 100-250MHz range will be deadBut of course, first of all, check the power supply voltages and check Q130 circuit for shortsIf you don't have the manual this can be downloaded fromhttp://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Tektronix/Tektronix_-_TM-500_Series/Tektronix_-_SG-503orhttp://w140.com/tekwiki/wiki/SG503B

author: Neomys Sapiens
author_rank: Super Contributor
timestamp: May 24, 2018, 09:51:39 pm
content: @BhannisNewbie at the forum, but no newbie in respect to the TM500-series, obviously!?You are not alone here - more operators and threads on those!Here for example:https://www.eevblog.com/forum/testgear/tektronix-tm-series-test-equipment/msg1252616/#msg1252616

author: Bhannis
author_rank: Newbie
timestamp: May 25, 2018, 08:32:44 am
content: @Neomys SapiensYou're right. I'm a newbie at the forum but have been playing with the old tektronix stuff for some time, just for fun.I simply love these old TM500 units. They do what they are suppose to and are quite easy to work onI have a small collection now and all from broken, none-functional, cheap ebay units. I can almost smell the burned tant when I see picture of one of these units

author: ajhalls
author_rank: Newbie
timestamp: May 25, 2018, 09:43:25 pm
content: Thank you very much, I swapped them and got it working differently, the range is now around 90k-260k which should get me working again. I will see if I can buy a few more and change them out.Alan
How to remove trim strips from HP 8714ET handles? - Page 1
Forum section: electronics / testgear

author: KrudyZ
author_rank: Frequent Contributor
timestamp: May 24, 2018, 01:13:06 am
content: All the ones from HP I encountered in the past had adhesive backing, but this one doesn't seem to.I used Exacto blades to lift the sides and there doesn't seem to be any adhesive.However I can't find any clipping features either and the front doesn't budge at all.How do these things come off???

author: TheSteve
author_rank: Unknown
timestamp: May 24, 2018, 01:52:46 am
content: They slide forward towards the front of the handles.

author: KrudyZ
author_rank: Frequent Contributor
timestamp: May 24, 2018, 02:45:04 am
content: Quote from: TheSteve on May 24, 2018, 01:52:46 amI'm sure that's what they were designed to, but mine were really jammed in on the front and age made them brittle, so they decided to break instead of sliding

author: TheSteve
author_rank: Unknown
timestamp: May 24, 2018, 02:48:37 am
content: In future if you think the plastic is brittle you can get them nice and warm with a heatgun, that will soften them up a little.

author: KrudyZ
author_rank: Frequent Contributor
timestamp: May 24, 2018, 06:11:51 am
content: Good idea.I'll try to remember that.This unit is really well built and mine is also VERY clean.I'm looking at doing an LCD conversion on this.I'm leaning towards your analog VGA approach. Adding the missing parts for the digital interface seems a lot more work and I'm not sure if the results are any better.
HP 837xx power calibration and firmware? - Page 1
Forum section: electronics / testgear

author: Staffan321
author_rank: Regular Contributor
timestamp: May 23, 2018, 07:20:46 pm
content: Hello,Hoping this is not too far off topic.Does anyone know where I can find the power calibration routine (service disks) for the HP 83712/83732A RF signal generator? What would be second best (also good of course) would be a dump of the firmware - possibly being able to figure out the available GPIB commands.I have posted at the Yahoo group "HP/Agilent test equipment", but not too much attention unfortunately. Also checked ko4bb.Regards,Staffan
Mastersizer 2000 - Page 1
Forum section: electronics / testgear

author: JanJansen
author_rank: Frequent Contributor
timestamp: May 23, 2018, 05:57:22 pm
content: Hi, i am curious how such a machine exactly works and why is it so expensive ?https://www.malvernpanalytical.com/en/support/product-support/mastersizer-range/mastersizer-2000Mastersizer 2000 particle measurement.It seems they have a laser to measure the light or something ?, how does it knows all the different particle sizes then if it only measures light intensity ?I bet there is no teardown possible, to expensive,i hear they dont make repairs or spare part for this model no more, so who knows.Maybe someone knows how this works ?thanks, greetings

author: bson
author_rank: Unknown
timestamp: May 24, 2018, 04:52:58 am
content: Quote from: JanJansen on May 23, 2018, 05:57:22 pmPerhaps it measures diffraction size as well?
New to me Tek 2465A DM - Not Getting Waves - Page 1
Forum section: electronics / testgear

author: ajhalls
author_rank: Newbie
timestamp: May 22, 2018, 02:59:10 pm
content: I just picked up 3 used Tektronix 2465A scopes for about $100 and am working on getting at least one working. They have been sitting for a while and 2 of them power on with a message "Test 04 Fail 03", which I understand means it will need to be recalibrated due to the battery running out of power. I tried bypassing the error and am able to get some flashing lights on channel 1, as long as the time is decreased to it's lowest setting, as soon as I try getting it to trace the line over time I lose it. Here is a video which includes all the buttons I have pushedhttps://youtu.be/oQgk_9dWfs8If anyone has dealt with this and knows what I should do next, I would appreciate it.

author: bsudbrink
author_rank: Frequent Contributor
timestamp: May 22, 2018, 03:23:59 pm
content: You will get some good help here, I'm sure, but one other thing you really want to do is subscribe to the Tek Scopes mail list:https://groups.io/g/TekScopes

author: tautech
author_rank: Super Contributor
timestamp: May 22, 2018, 08:28:21 pm
content: Excellent thread that gives some great guidance:https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/
34401A possible to cal single range ? - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: May 20, 2018, 11:55:54 pm
content: Is it possible to run a zero cal and then calibrate only a single range, say the 10V range?I haven't found much info on this and the calibration instructions state that you must perform only in the order shown in the verification tables.

author: Danielaz
author_rank: Newbie
timestamp: May 21, 2018, 05:12:06 am
content: Questions about the forum do not know where you brought the content from.

author: Dr. Frank
author_rank: Super Contributor
timestamp: May 21, 2018, 08:21:49 am
content: Quote from: EE-digger on May 20, 2018, 11:55:54 pmYes, the 34401A allows to calibrate single ranges.The calibration of the 10Vdc range, but also the 1V and 100mV ranges might affect other modes, which require an absolute DC reference, like the AC ranges, and the current ranges.100V and 1kV will probably not affect other modes/ranges.Ohm should be measured by a ratio technique..check circuit diagram ... and therefore should not be affected by the 10V re-calibration.Frank

author: EE-digger
author_rank: Frequent Contributor
timestamp: May 21, 2018, 11:07:29 pm
content: Dr. Frank, thanks. I'll be sure to be adequately prepared before tackling any other ranges. I discovered my problem was that I was not waiting for the process to complete, thinking I had to press enter to move along.Danielaz, Sorry but I don't understand your post.
HP 5381A Frequency Meter - Page 1
Forum section: electronics / testgear

author: beanflying
author_rank: Super Contributor
timestamp: December 17, 2017, 03:51:34 am
content: Not a lot here on these but they date back to the early 70's and until the early 80's. Introduced as a bare bones simple accurate frequency meter (long before sub $20 delivered and evilbay). This one cost me a touch under $50 delivered in an Auction.This one has the fairly common LED display issues and looking at the manual carefully reveals at least 6 different LED combinations were used all HP branded. The units aluminium case gets fairly warm which wouldn't help.Apart from the display issue it is reading within good tolerance against my 34401a from 1k-100kHz at low frequencies below 10hz it really falls over which is as per it's spec. Upper end to 30MHz aligns with what signal generator I currently have (better stuff on the way). Where I got it for was higher frequencies where the 34401a and my handheld meters won't go and 80Mhz is plenty as I don't do any RF.The manual for any of the 5381a, 5382a and 3a makes for some good reading on how 'proper' electronics was done back in the day (IC's are date coded late 1973)So worth keeping an eye out on evilbay, shipping will be more than the cost of the unit.Mods coming up for mine:1MHz OCXO (units timebase) internal oscillator using a divided 3.2Mhz Polytron. Not in a rush for this as the unit is stable and with an IR gun the current XO is running over 35+ degrees so the stability is good.Fix LCD display.Use for the next 4 decadesOpening the case was a good/bad surprise. The LED plastic baggy and paper around heat and sensitive bits are not a good combo. Bonus there is one LED of two needed for the display.

author: beanflying
author_rank: Super Contributor
timestamp: December 17, 2017, 09:50:47 am
content: The Best laid plans of Mice!Seems the LED in the box was WRONG. 12mm into a 10mm width doesn't work.The current LED installed on mine is HP 1990-470 and there is no datasheet anywhere I could find.Following the trail and the circuit diagram lead me to second hand pin compatible parts 'HP 5032-7731' scattered around evilbay secondhand for to much money.More searching of datasheets and eventually turned up Broadcom via Mouser with a '5082-611' as Broadcom used to be Avogo who used to be a division of HP .........So if I have this correct Current link to Mouser ishttps://au.mouser.com/productdetail/broadcom-avago/5082-7611?qs=sGAEpiMZZMvkC18yXH9iIsSFKp4VzurGsCKCtjcFOB8%3DSeems I might be making an external reference or dropping the double insulated OCXO back to a single can.Huge current XO next to a more than warm Transformer = Fairly Stable tempco.

author: Q2A
author_rank: Newbie
timestamp: May 21, 2018, 12:52:44 pm
content: I just came into possession of one of these with some segments out. This is VERY helpful. Thank you!