hybridfree/eevblog-posts huggingface dataset:
Epic Instruments "Wavesaver" -- looking for information - Page 1
Forum section: electronics / testgear

author: alsetalokin4017
author_rank: Super Contributor
timestamp: March 02, 2018, 03:37:37 am
content: This is an instrument that Saves the Wave ... it takes an input signal and somehow records and saves it for display on an analog oscilloscope. Someone donated it to me, and I was able to get it to save a waveform and display it on the scope so I suppose it works, but I haven't been able to find any information about it. It's very fiddly. A user's manual would be nice... even better a service manual with schematic. I'm not sure how it works inside, or just how properly to set it up to capture and preserve a waveform. From the appearance I'm guessing it is probably 1970's or 1980's vintage. I'm curious about the manufacturer also.Has a front panel BNC input jack, a toggle switch to select AC, DC or "off" input coupling, a "Voltage" rotary switch knob that goes from 0.05 to 10 volts in steps, a Trigger Level pot, a "Time per Point" rotary switch that goes from 100 ms to 2 us, plus "ext" which I guess is external, toggle switch for "int" or "ext" Trigger, toggle switch for "man" or "auto" ARM, big square pushbuttons for ARM and TRIG, and of course a toggle switch for power. Rear panel has the output BNC, external input, line power input.

author: tautech
author_rank: Super Contributor
timestamp: March 02, 2018, 03:41:13 am
content: Pics please.

author: alsetalokin4017
author_rank: Super Contributor
timestamp: March 02, 2018, 05:14:09 am
content: A pic anyhow. Sorry about the light...

author: Zucca
author_rank: Unknown
timestamp: March 02, 2018, 08:24:32 am
content: Epic!

author: Eric_S
author_rank: Regular Contributor
timestamp: March 02, 2018, 10:04:12 am
content: Quote from: alsetalokin4017 on March 02, 2018, 03:37:37 amNeat, how long can the waveforms be and what sort of bandwidth are we talking about? Does it shift the frequency? So a MHz signal gets shifted to a kHz for example.As for how it operates, maybe it plays some magic with fundamental tones (putting components into resonance)?...Opening the thing up could be interesting perhaps?

author: unmanaged
author_rank: Newbie
timestamp: May 13, 2023, 08:08:07 pm
content: see attached... this was provided by Larry that worked for DEC from 1986 to 1998 ...

author: unmanaged
author_rank: Newbie
timestamp: May 13, 2023, 08:08:56 pm
content: see attached
Tektronix Net Tek Y250 - Enabling Options - Page 1
Forum section: electronics / testgear

author: radioman25
author_rank: Newbie
timestamp: May 12, 2023, 11:07:49 pm
content: The Net Tek is an obsolete cell site test instrument that can be used for a number of general RF tests. The unit is around 20 years old, pretty useless for modern cell systems, and obviously no longer supported by Tektronix.However, the spectrum analyzer module, YBT250 has a number of options that can be activated using keys tied to the module serial number. One in particular, RF Scout, is interesting for hobbyists and experimenters.I saw a post with a link tohttps://0xacab.org/mitic/tek-ssc/-/blob/master/README.mdand that site indicates the option key generator works with the YBT250.Has anyone actually tried to activate additional options and did it work?
Recommendations for a decent logic analyzer?...  - Page 1
Forum section: electronics / testgear

author: Rax
author_rank: Super Contributor
timestamp: May 12, 2023, 02:39:34 pm
content: Hi all,I'm working on reading data lines on a faulty Fluke 5440A with an inoperable screen, and I am currently unable to read them properly. This is for error codes registered during startup, and I don't seem to quite be able to set the triggering to expected events on the main channel, etc. I am doing this with a Hantek 6022BL, and I'm very disappointed for essentially having no settings to define for the instrument operation and probing.I wonder if there are any recommendations for an affordable but capable logic analyzer. I am aware of a plethora of new production ones, USB and whatnot, but if a rather vintage unit has the adjustment capabilities I am looking for, I'd like to hear that too. I think generally speaking classic logic analyzers (Tektronix, HP, etc.) seem to be available very affordably these days.Thank you for sharing your thoughts.
What is the  usage of the external trigger input of a counter/timer - Page 1
Forum section: electronics / testgear

author: erikka
author_rank: Regular Contributor
timestamp: May 13, 2023, 01:38:06 pm
content: Some counter/timers have an external trigger input but I have never used such an input so maybe someone can help me?I've read it can be used for timing the opening (and/or closing?) of the counter gate after 1 to n pulses at the trigger input and after an optionally delay.What is the most important use case for such an external trigger input?How precise must the time relation between the trigger pulse and the opening of the gate be? milli seconds? micro seconds? nano seconds?
Amprobe AM-500-EUR etc recall - Page 1
Forum section: electronics / testgear

author: jmh
author_rank: Contributor
timestamp: March 24, 2023, 06:20:11 pm
content: Appologies if this is old news but I couldn't find it -"Fluke Corporation has identified a safety issue affecting certain Amprobe brand AM-500-EUR, AM-500-EUR KIT, AM-510-EUR, AM-510-EUR KIT and HEX60-D Digital Multimeters,when used in CAT III electrical installations above 250 volts. (MEASUREMENT CATEGORY (CAT) III is applicable to test and measuring circuits suitable for connection to the distribution part of a building’s low-voltage mains installation.) As a precautionary measure, Fluke has decided to recall all the affected products and provide affected customers with a no-cost repair."The info is athttps://www.beha-amprobe.com/en/announcements/safety-warning-please-readimportant-product-safety-recall-information-regarding(if this is old news this post can be culled, I figure it's better to have it twice than not at all)

author: Kean
author_rank: Unknown
timestamp: May 10, 2023, 12:35:22 pm
content: Just saw this recall was also announced by Fluke Australia recently.Same issue with incorrect fuse installed for CAT III use, potential for fuse rupture and uncontained arc explosion.https://www.amprobe.com/amprobe-am-500-am-510-safety-notice/https://www.productsafety.gov.au/recalls/fluke-australia-—-am-510-digital-multimeter
Fluke 7261A Fuse selection - Page 1
Forum section: electronics / testgear

author: C_Norris
author_rank: Newbie
timestamp: May 08, 2023, 07:46:58 pm
content: Hi,I bought a Fluke 7261A on eBay from the US and had it shipped to the UK (which was still cheaper than buying one locally...).I switched the voltage to 240V as described in the manual, and that worked (no smoke came out anyway), but it also says I should fit a different fuse.Code:4-15. The 7261A line power fuse is accessible on the rearpanel. Fuse requirements are a 3/8A MDL (slo-blo) forline inputs of 100V or 120V and a 3/16A MDL (slo-blo)for line inputs of 220V or 240V.The fuse in it now says "3/8A 250V 3/3" so that seems valid for its original country, although I don't know what the "3/3" means.Do they literally mean I need a fuse rated for 3/16 of an amp, i.e. 187.5mA?And is there anything else special I should keep in mind when choosing a replacement?Presumably it's only worked with this one because I didn't have it powered on long enough for the fuse to blow.Any help would be appreciated, thank you.

author: TimFox
author_rank: Super Contributor
timestamp: May 08, 2023, 09:35:20 pm
content: With the power switch correctly set to 240 V instead of 120 V, the line current should be 1/2 of the draw at 120 V, so the 3/8 A fuse is too large.Therefore, if the Fluke is working properly, it won't blow the 3/8 A fuse that came with it.MDL is a standard slow-blow glass fuse in the American size of 1/4" diameter, 1.25" long, and 3/16 A is one of the available values.Data sheet:https://www.eaton.com/content/dam/eaton/products/electronic-components/resources/data-sheet/eaton-mdl-time-delay-glass-tube-fuses-data-sheet.pdf

author: factory
author_rank: Super Contributor
timestamp: May 09, 2023, 05:59:40 pm
content: Quote from: C_Norris on May 08, 2023, 07:46:58 pmCould the "3/3" actually be "313"? this is a Littelfuse type/series for 3AG slow blow glass cartridge fuses, in ¼" x 1¼" size.https://www.littelfuse.com/media?resourcetype=datasheets&itemid=5c3f82d8-3d46-4d05-abe6-349ce263157b&filename=littelfuse-fuse-313-315-datasheetDavid

author: C_Norris
author_rank: Newbie
timestamp: May 09, 2023, 08:41:59 pm
content: Thanks both for your replies!I think you're right David, it was313rather than3/3.I have ordered the Eaton BK/MDL-3/16-R.
R&S FSH6 Calibration - Page 1
Forum section: electronics / testgear

author: zitt
author_rank: Regular Contributor
timestamp: May 09, 2023, 03:05:15 am
content: I just bought a "bargain basement" FSH6 to use on my bench. I've been actually watching for a "deal" on a Rigol SSA... but this deal kinda fell in my lap.The unit had a broken front plastic bezel which I'm trying to get a spare part from R&S. Other than that; the listing said:QuoteI don't think I have a signal gen that will operate anywhere near that frequency.Does anyone have some experience they can share for this noob? Since the unit doesn't have a tracking generator; is there anything I can do in my home lab to repeat the test to verify it is indeed low?Extra Credit: Can I then fix this frequency error thru calibration? Or will it require a repair?I have one out of 3-4 "calibation houses" that said:Quotethen quoting an 85/hr and saying most are repaired within 5 hours. I'm not against paying 425 to have it repaired... but I don't want to give them that kind of cash if this is a simple fix.Advice?
SDS2104X unlock - Page 1
Forum section: electronics / testgear

author: sAeDrMvIeNr
author_rank: Newbie
timestamp: May 08, 2023, 06:18:41 pm
content: Hello everybody!After a very long search today I decided to open a new topic..I have the SDS2104X (not the plus or HD, the original one) and i would like to enable the options but can't seem to be able to figure it out.Does anybody have any info or can give me direction on how to proceed (if it is possible in the first place anyway)?
HP 6811B Service Manual - Page 1
Forum section: electronics / testgear

author: BVinPA
author_rank: Newbie
timestamp: May 09, 2023, 06:32:51 pm
content: I know this is a real longshot, but does anyone have access to a service manual for the original HP 6811B with the through-hole inverter board? You can find the Agilent and Keysight ones easily online, but the older HP has a different inverter and I desperately need a schematic. I'm sure it was only available in paper form, not electronic. All I need is the schematic and troubleshooting pages for the A7 inverter.
SPI decoder on DSOX2000 series oscilloscopes - Page 1
Forum section: electronics / testgear

author: ABH
author_rank: Newbie
timestamp: May 08, 2023, 05:03:21 pm
content: My DSO-X 2002A oscilloscope has the DSO, EMBD (and other) options.I somehow managed to decode a 3-wire SPI bus using SCLK on the external (trigger) input, MOSI on channel 2 and MISO on channel 1.CS was set to "Clock Timeout". I had the decoding working on screen and in the Lister.When I had this working I observed, that the Acquisition Rate was only half of what it used to be (for the same time span).This was quite surprising, because in another setup where I did 2-wire SPI decoding I had SCLK on channel 1 and still had both channels stored in memory with normal Acquisition Rate.Therefore I left this 3-wire decode mode, that I accidentally had managed to set up, and went back to 2-wire SPI decoding.I have now tried for hours to get the 3-wire decode mode back but this seems impossible. Having SCLK on EXT input works fine and CS set to "Clock Timeout" also works fine, but I cannot select another channel for MISO. If MOSI is set up on channel 1, then it "merges" MOSI and MISO on channel 1 and the same happens if I change MOSI channel to 2, then it merges both chanels in the decoder to channel 2. The channel display on the screen correctly shows what is connected to the channels, i.e. both MOSI and MISO are shown correctly and stored in memory. It is only the decoder that refuses to decode more than the MOSI channel.According to the documentation for the EMBD option it is not possible to decode 3-wire SPI, -this requires a 4-channel model. It just annoys me that I actually had this working.Does anyone have experience with 3-wire SPI decoding on a dual-channel model?
121GW Auto Power Off - Page 1
Forum section: electronics / testgear

author: blackjetrock
author_rank: Contributor
timestamp: May 03, 2023, 08:15:26 am
content: I have had a 121GW for quite a while now. It's great for me apart from the battery life. I seem to have replaced the batteries several times in just a few months. I finally did a bit of investigation and found that in use the 121GW takes about 10mA, and when switched off at the switch it takes 0mA. When auto powered down it takes 10mA, so the same as being on. Surely this isn't correct? It explains the sets of batteries I have put in it too. Is there a fault with this meter/Andrew

author: mwb1100
author_rank: Frequent Contributor
timestamp: May 03, 2023, 06:32:01 pm
content: There's a recent thread about annoying multimeter APO behavior (https://www.eevblog.com/forum/testgear/seek-multimeter-that-not-eat-batteries-or-turn-off/), but this has got them all beat!

author: mwb1100
author_rank: Frequent Contributor
timestamp: May 03, 2023, 06:39:49 pm
content: In all seriousness though - it has to be a fault - right? Hopefully someone else with a 121GW can do a comparison test and post the results. Also wouldn't hurt to drop Dave a DM or email. He's done a couple of post-mortem videos on an RMA'ed BM786 (and BM235?). I'd certainly be interested in a vid on whats going on with your 121GW.

author: bdunham7
author_rank: Super Contributor
timestamp: May 03, 2023, 06:53:40 pm
content: Quote from: blackjetrock on May 03, 2023, 08:15:26 amDoes that persist for a long time or is it just for a few minutes? I'd set it up to measure its current, let it APO and then watch it for two hours. If it still draws 10mA after that I'd say it was an issue.

author: blackjetrock
author_rank: Contributor
timestamp: May 07, 2023, 08:03:54 am
content: Quote from: bdunham7 on May 03, 2023, 06:53:40 pmI'm pretty sure it does persist for a long time as sets of batteries are being flattened in just a few days with the meter off.Andrew

author: blackjetrock
author_rank: Contributor
timestamp: May 07, 2023, 08:05:26 am
content: I have tried APO with the Sd card removed, and it is the same. Around 10mA when on and after APO has turned the meter off still around 10mA.Andrew

author: Dr. Frank
author_rank: Super Contributor
timestamp: May 12, 2023, 07:45:51 am
content: I own one of the early adopters 121GW. FW is 2.05.It consumes 5.5mA @ 6V ON, below 100µA when OFF.Max. consumption is about 28mA, when the beeper is activated.In APO state, it consumes 1.2mA only.The battery runs very long.Frank
Matrix MPS 3005H power supply  - Page 1
Forum section: electronics / testgear

author: mrjeff51
author_rank: Newbie
timestamp: May 05, 2023, 01:42:45 am
content: Does anyone have the matrix MPS 3005 power supply. I recently bought one from Amazon and it makes a weird series of clicks when I turn the output on or off. Not sure if this is normal or if I should return it.Here's a video of it:https://imgur.com/a/yL4NqSF

author: AndyC
author_rank: Contributor
timestamp: May 05, 2023, 08:45:52 pm
content: Quote from: mrjeff51 on May 05, 2023, 01:42:45 amThat's normal. There are several relays in that power supply, so there will be clicks when adjusting voltage etc.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 05, 2023, 09:33:48 pm
content: Yes I have the 3605 and it does click when changing the voltage. It's a linear power supply and needs to switch transformer tap for the voltage ranges to prevent too much heat dissipation.
HP 3466A DMM measurement kinda unstable/never settles - Page 1
Forum section: electronics / testgear

author: kblue
author_rank: Regular Contributor
timestamp: May 05, 2023, 01:09:48 am
content: Hello and greetings from Germany!Mayhaps someone here can help me with a little problem (i do hope its just a little thing).The problem shows as follows: If I switch the HP 3466A on and measure immediately a 10 V DC source, the HP 3466A shows me pretty much exactly +/- 10 V. If I leave this source connected to the HP 3466A, it can be observed how the reading keeps dropping and seemingly never comes to a stop. After a few minutes, for example, it reads 9.499 V and continues to drop, albeit at an increasingly slower rate. Other DMMs running in parallel stop at +/- 10 V (as expected).The HP 3466A is still completely untouched (all original) and comes with the battery pack. This battery pack is also still connected, even though it can no longer hold a charge.Thanks for any advice!

author: wn1fju
author_rank: Frequent Contributor
timestamp: May 05, 2023, 11:57:59 am
content: You can try two things:1) Remove the battery pack and charger board. Solder a small jumper wire (JM700 in the schematic) to make the 3466A run solely off of AC power.2) Squirt contact cleaner into all the pushbutton switches and exercise them vigorously. On my unit, the switches were pretty well sealed and I had to carefully drill small holes into them in order to get the cleaner fluid inside.

author: kblue
author_rank: Regular Contributor
timestamp: May 05, 2023, 04:25:59 pm
content: Hello there!I was sure I had cleaned the unit's switches. I guess I had forgotten about it when the unit came into my possession months ago.Thank you so much! The two hints were spot on!
TestEquity bought Tequipment for $55M - Page 1
Forum section: electronics / testgear

author: EEVblog
author_rank: Unknown
timestamp: April 13, 2023, 05:25:56 am
content: Old news, but I only just found out:https://www.businesswire.com/news/home/20220428006231/en/TestEquity-Announces-Strategic-Acquisition

author: Fungus
author_rank: Super Contributor
timestamp: April 13, 2023, 08:12:31 am
content: Does that mean Tequipment service is about to go to hell?

author: EEVblog
author_rank: Unknown
timestamp: April 13, 2023, 11:16:26 am
content: Quote from: Fungus on April 13, 2023, 08:12:31 amDon't know. But it does mean Evan got himself a really nice payday.

author: tomwilkinson
author_rank: Contributor
timestamp: April 13, 2023, 12:12:54 pm
content: That explains why that last three thing I ordered from TEquipment where shipped from TestEquity.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 13, 2023, 12:47:36 pm
content: I would have thought the bigger news yesterday was Emerson buying NI for $8.2B.https://marketchameleon.com/Overview/EMR/PressReleases/

author: tautech
author_rank: Super Contributor
timestamp: April 13, 2023, 09:39:40 pm
content: Quote from: EEVblog on April 13, 2023, 05:25:56 amAh, that ^^ explains much:https://www.eevblog.com/forum/testgear/bought-new-siglent-sds2104x-plus-received-open-box-scope-wwyd/

author: thm_w
author_rank: Super Contributor
timestamp: April 14, 2023, 01:14:56 am
content: EBITDA of 6x is relatively low (10-15x is considered good), but maybe thats normal for a reseller?QuoteEither way their prices were always better as they had the discount. Testequity prices don't look as good.

author: EEVblog
author_rank: Unknown
timestamp: April 14, 2023, 09:00:31 am
content: Quote from: thm_w on April 14, 2023, 01:14:56 amI would presume so, as you are essentially only buying the goodwill of the name and customer database, and whatever the distribution centre is. Someone else said that they got Tequipment stuff delivered by TestEquity, so maybe they don't even use the distrubution centre any more?

author: tequipment
author_rank: Regular Contributor
timestamp: May 08, 2023, 12:51:43 pm
content: Hello all. You will continue to get the same great service. Your EV blog special pricing is still in place. We appreciate all of our business and especially this channel. I left college at 21( after my jr year as EE major ) to take care of the family. A year later we started TEquipment and grew it to the company it is today. We value our customers are the culture of the company. You can still reach me at TEquipment.Thanks!Evan
Voltcraft DLP-3303 - Page 1
Forum section: electronics / testgear

author: fisz
author_rank: Contributor
timestamp: May 04, 2023, 12:16:49 pm
content: Can't find anything online about this power supply.Maybe it is rebranded and goes with a different name?Is it worth buying?https://www.conrad.com/p/voltcraft-dlp-3303-bench-psu-adjustable-voltage-0-30-v-0-3-a-198-w-rs232-usb-lan-slave-communication-protocol-2619139

author: Jeroen3
author_rank: Super Contributor
timestamp: May 04, 2023, 01:00:12 pm
content: Looks like an OWON 3303 or PEAKTECH 6181 or PROMAX FA-853Bhttps://www.eleshop.nl/owon-odp3033.htmlhttps://www.reichelt.nl/nl/nl/laboratoriumvoeding-0-30-v-0-6-a-gestabiliseerd-programmee-peaktech-6181-p246154.html?r=1

author: Aldo22
author_rank: Super Contributor
timestamp: May 04, 2023, 02:58:15 pm
content: Yes, it looks like an OWON.Conrad has done that before. An OWON with a different "style" for for much more money.See:voltcraft-dso-2072hvs.https://de.aliexpress.com/item/1005004573758332.html
mixer/adapter for swept analyzer? - Page 1
Forum section: electronics / testgear

author: nenea dani
author_rank: Regular Contributor
timestamp: May 03, 2023, 10:59:18 am
content: Hello colleagues,I wonder why most signal swept analyzers do not go below 9kHz or 5Khz the most performing ones. Is there any adapter to translate the 20Hz-20kHz spectrum for these swept analyzers?

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 03, 2023, 03:42:32 pm
content: It's because the biggest capacitor in the high frequency capacitor kits from ATC and Johanson has a 3dB frequency of 9kHz when you drop it into the signal path as a DC block.

author: nenea dani
author_rank: Regular Contributor
timestamp: May 03, 2023, 05:50:24 pm
content: Why is a HF capacitor mandatory? Let me understand that, for example an high pas filter with 100 microfarads and 50 Ohms has a fcorner of 32 Hz? For compensation, there is a normalization function in TG mode if I'm not mistaken.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: May 03, 2023, 08:04:09 pm
content: Competing priorities. RF instruments are made for RF applications which typically only care about DC-kHz for the purpose of providing power or flipping switches. Sometimes they need to tolerate DC, hence the blocking cap, but they generally don't need to analyze DC so they aren't good at analyzing DC.Lower frequency applications exist, of course, so the idea is that you should use different equipment for this. Many techniques are practical at kHz that aren't practical at GHz so a good audio frequency analyzer will look very different from a good RF analyzer. Sound cards, high bit-depth oscilloscopes, dynamic signal analyzers, etc should cost less and perform better than trying to use an RF analyzer for something it isn't good at. If youreallyneed both in one instrument, sure, you could upconvert, and you could also use a bias tee -- but make sure that you gain something in the combination, because otherwise these should really be two different instruments.

author: David Hess
author_rank: Super Contributor
timestamp: May 03, 2023, 10:13:16 pm
content: The input coupling capacitor is one reason, but there are two more:1. The frequency response of the first mixer only extends so low. However for operation down to DC, the mixer ports can be swapped, although combined with removing the input coupling capacitor this makes the first mixer more susceptible to damage.2. The increasing phase noise from the local oscillator makes lower frequency measurements noisy.

author: nenea dani
author_rank: Regular Contributor
timestamp: May 04, 2023, 01:02:35 pm
content: Dear colleagues, thank you for your attention. Please read my two posts in the sectionhttps://www.eevblog.com/forum/projects/front-end-for-a-swept-spectrum-analyzer/I think you can help me with some advice. I built two versions, everything would be fine except the output level is too low.
HP 4195A Reparation - Page 1
Forum section: electronics / testgear

author: Charlie_90
author_rank: Newbie
timestamp: May 03, 2023, 06:47:50 am
content: Hi all,I've got an old HP 4195A.At the beginning, it worked. Everything went fine and so on. The thing was that the floppy drive was so dirty and decided to clean it. Once I did it, I inserted a floppy disk and error message appear in the screen (something like cannot read the disk).I tried to use other floppy drive units but doest not work and even made that the screen was on but black with a beep sound.So, now...the HP 4195A does not "work". It starts up but cannot show nothing on the screen and the beep sounds is constant.Any ideas?Many thanks in advance!

author: samofab
author_rank: Regular Contributor
timestamp: May 03, 2023, 07:04:36 am
content: Service manual with full schematics can be found on the internet - start there.

author: fenugrec
author_rank: Frequent Contributor
timestamp: May 04, 2023, 12:40:30 am
content: Quote from: samofab on May 03, 2023, 07:04:36 am+1.You will then want to look at the power supply module (a few infamous RIFA caps), and the RAM backup battery on A6 or A8; a dead battery will cause boot failues (I repaired mine thus :), and if it leaked out and corroded the board other weird problems could pop up.
Ethernet Digitizer - Page 1
Forum section: electronics / testgear

author: mdt
author_rank: Newbie
timestamp: May 01, 2023, 08:05:25 pm
content: Hello! I am looking for an oscilloscope/digitizer that can be controlled from computer via ethernet. I have been using the BitScope 445http://www.bitscope.com/product/BS445/but it's not working anymore and the company is not responding. I know there are quite a few options (Analog Discovery, PicoScope, or CleverScope), but here are some of my main requisites:- Ethernet interface (as digitizer needs to be far away from computer, and on different ground than computer)- At least 10 MS/s- I need to analyze signals from 1 mV to 10 V- At least two channels with external trigger- Digitizer software needs to run on Linux and should have Python API- If it has a rack-mount option, that would be a plus!Any suggestions you have are greatly appreciated! Thank you!

author: alm
author_rank: Super Contributor
timestamp: May 01, 2023, 10:07:37 pm
content: The combination of features of somewhat high sampling rate, multiple gains and ethernet is uncommon, I believe. So that probably translates into expensive. Do you want to continuously stream samples or is batch wise acquisition like an oscilloscope acceptable? Then a bench scope with ethernet might be the cheapest solution.Another alternative is a USB DAQ/scope connected to a small single board computer running Linux that connects to ethernet.

author: dobsonr741
author_rank: Frequent Contributor
timestamp: May 02, 2023, 02:46:42 pm
content: I assume needs to be a low budget solution - please take a look at the Digilent offerings:https://digilent.com/shop/test-and-measurement-equipment/usb-oscilloscopes-analyzers-and-signal-generators/Ethernet is not built-in, can be done with adding a raspberry pi.

author: alm
author_rank: Super Contributor
timestamp: May 02, 2023, 03:15:53 pm
content: If you need 10 MS/s streaming, then look carefully at the specs. For example theDigilent ADP3250is said to sample up to 125MS/s in record mode, butonly ~1MS/s in 'Linux mode'. It wouldn't surprise me if the maximum sample rate via ethernet is also lower.

author: mdt
author_rank: Newbie
timestamp: May 04, 2023, 09:28:15 pm
content: Quote from: alm on May 01, 2023, 10:07:37 pmThank you. Something below $1k would be nice. I don't need to continuously stream, so what you are suggesting would work. Any scope you would recommend given what I need? Thanks!
Hameg 203-5 - Page 1
Forum section: electronics / testgear

author: Qa3qa3qa3
author_rank: Newbie
timestamp: April 30, 2023, 08:22:42 am
content: Hi,I bought a Hameg 203-5 scope, which had flickering traces whenever the controls are manipulated, it looked like it needed some cleaning so i went ahead and disassembled the unit, gave it a good clean and all worked fine.The issue is, when i was putting it back together, i couldnt remember which of the TO220 packages devices was screwed down to the chassis without insulation, one of them is the TIP47 npn transistor in the regulation circuit for the 170v rail, i ended up guessing it, i screwed the TIP47 down to the chassis with no insulation shorting its collector to GND, when i powered up the unit it only showed three dots in the center of the CRT, i started measuring the PS voltages, the 170 and 140v rails were showing 25v and 23v respectively, i think i have damaged something in the circuit.I tried troubleshooting the regulator circuit replacing the TL431 and the BF423 with no success. I still didnt replace the TIP47 yet though.I decided to inject a 170v from an external source and see what effect it has on the unit, when i did the traces showed up and everything was normal but i noticed a resistor (R707 circled in red) was heating up in an adjacent circuit.My question is if anyone has run into a similar issue how did u manage to fix it.And basically where should i start.Thanks

author: TaylorD93
author_rank: Regular Contributor
timestamp: May 03, 2023, 10:17:19 am
content: Do you have a photo of how you currently have the transistors fitted?Have you screwed them all down to the metal chassis?the 170V rail is referenced to the 140V rail, but the TIP47 datasheet says the collector is connected to the "tab" of the TO-220 package, the schematics shows the collector of the TIP47 should be connected to ground/chassis.All of the output stage transistors, T708-T711 should be isolated from chassis. It may be that one of your transistors is shorting to chassis, and drawing too much current from the 140V rail.

author: Qa3qa3qa3
author_rank: Newbie
timestamp: May 03, 2023, 01:02:22 pm
content: Turned out that the 170v rail is regulated on the negative side and T1001 is the pass transistor that for some reason failed open and the load was being handled by R1005 which was getting hot, replaced T1001 which is a TIP47 and everything is back to normal, thank you so much and yes only T1001 and IC 1001 are tied to the chassis without insulation, other TO220 are insulated.Thanks a lot
Difference between AR Hypot 3600 versus 3700 series?  - Page 1
Forum section: electronics / testgear

author: julian1
author_rank: Frequent Contributor
timestamp: May 02, 2023, 10:11:02 pm
content: Does the forum have experience with AR Hypot - 3605 versus 3705 for example?Any significant hardware revisions or updates, or capability improvements?The units look identical from photographs.
FLUKE 1630-2 Earth Ground Clamp for loop resistance - Page 1
Forum section: electronics / testgear

author: HighVoltage
author_rank: Super Contributor
timestamp: May 06, 2023, 11:07:52 am
content: I just came across thisFLUKE 1630-2Earth Ground Clamp for loop resistance.This must be one of the most clever instruments I have come across in years.It looks like a clamp meter but it measures impedance.https://www.fluke.com/en/product/electrical-testing/earth-ground/fluke-1630-2-fcWhat I wonder is how this instrument works.Maybe one coil introducing a current in to the conductor under test and another coil is measuring the response?Anyone here having used such instrument?

author: Grandchuck
author_rank: Super Contributor
timestamp: May 06, 2023, 12:35:21 pm
content: Here is a clue:

author: AVGresponding
author_rank: Super Contributor
timestamp: May 06, 2023, 01:00:52 pm
content: Yes. The resistance mode uses an AF pulse in the coil. The coil has to be completed when the jaws close, so unlike common current clamps these have fine leaves of metal (not sure what, could be stainless steel or plated copper) which mesh together to make the circuit when the clamp jaws close.I have an RS Pro 5601 (rebranded Prova) one that I got cheap (£10 + shipping) because the leaves were damaged. They just needed bending (very carefully, they are delicate) back into shape. It can measure loop resistances down into the milliohm range, and leakage currents in the tenths of a milliamp.
JAVA - VISA - SCPI - Page 1
Forum section: electronics / testgear

author: luudee
author_rank: Frequent Contributor
timestamp: May 02, 2023, 10:41:52 am
content: Hi Guys and Gals,I would like to write a tool to control my SCPI capable instruments.I would prefer to use java as it has the most sophisticated GUI tools,and is cross-platform usable.Yes, yes, I have seen the "TestController" and have tried to use it,but it is not very well documented and doesn't seem to work for me.It would be nice to find a Java library that can interface withvarious VISA implementations.Any pointers appreciated!Cheers,luudee

author: dobsonr741
author_rank: Frequent Contributor
timestamp: May 02, 2023, 02:57:25 pm
content: Tha Java path is not so well travelled. You’ll find python most of the time. I found python for SCPI is robust, reproducible, if you add Jupyter notebooks, pandas and pychart to the mix the productivity skyrockets over Java tinkering. I say this after 25 years Java experience.

author: luudee
author_rank: Frequent Contributor
timestamp: May 02, 2023, 03:25:35 pm
content: Thank you Dobsonr for your feedback.My main reason for looking at java, was building GUIs. Something I find draconian when using tkinter.Would you have perhaps better suggestions for GUIs and python ?Again, thank you for the feedback, much appreciated !!!luudee

author: dobsonr741
author_rank: Frequent Contributor
timestamp: May 02, 2023, 03:40:05 pm
content: It depends what level of GUI you want. You can have a real time updating digram or histogram, a few action buttons with practically no coding effort, as long as you are fine with a Jupiter notebook. It runs in a browser window. Can iterate fast and stick to the measurements, not spend time on UI code development. And dataset handling with pandas and advanced math is also coming free.So my suggestion is try Jupyter - lots of tutorials exist. Here is one:https://notebook.community/seewhydee/ntuphys_nb/jupyter_tutorial/jupyter_tutorial_02

author: luudee
author_rank: Frequent Contributor
timestamp: May 02, 2023, 04:00:37 pm
content: Thank you again Dobsonr, I will try out Jupyter !

author: alm
author_rank: Super Contributor
timestamp: May 02, 2023, 05:21:33 pm
content: I believe there are some Java wrappers for VISA libraries, and of course you could wrap it yourself using JNI. But in both cases you'll likely be compromising cross-platform abilities. I agree with dobsonr741 that this is not a well traveled path, so I'd only take it if you're heavily invested in it.In Python there are pure-Python implementations of some of the common VISA transports likeVXI-11(SCPI over the network), which I'd say are the most portable solutions. There are alsowrappers around for example USB-GPIB driversorthe commercial VISA implementations, but I personally prefer not to bother and talk VXI-11 in pure Python. That's the least hassle for me.
BK precision multimeter fault - am I using it wrong? - Page 1
Forum section: electronics / testgear

author: tombo
author_rank: Newbie
timestamp: April 30, 2023, 12:18:44 pm
content: Hi Allnew to the forum, been using my BK precision Multimeter to measure mains voltage on a hot water boilerhere in the UK it should read 240v but is telling me 150vIvegot a 20 year old no name cheapy meter that reads the voltage correctlyany ideas, is if faulty or am I using it wrong?Cheers

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 30, 2023, 04:35:46 pm
content: My guess is something wrong with the meter but to be sure I think it's helpful if you post the model number and also what settings you use.

author: tombo
author_rank: Newbie
timestamp: May 02, 2023, 10:22:22 am
content: Hi,Thanks for the reply its a BK precision 2712, irritating if its faulty as these are quite expensive though not fluke costsplease see photo of meter measuring mains voltage, you can see the model and the reading I am gettingCheers

author: Kleinstein
author_rank: Super Contributor
timestamp: May 02, 2023, 10:48:59 am
content: The meter settings looks correct. So it could be a faulty meter or maybe just faulty cables. Due to capacitive coupling one may still get some AC votlage, though lower than it should be.One could do a test in ohm mode to see if it is reading Ok there. The ohms part is more sensitive to a bad cable.

author: wasedadoc
author_rank: Super Contributor
timestamp: May 02, 2023, 10:58:59 am
content: I see only one probe and it is on the neutral pin. Where is the other probe?

author: tombo
author_rank: Newbie
timestamp: May 02, 2023, 12:42:49 pm
content: sorry bad photo other lead is behind on the live terminalI'm guessing the meter is faultyive just used that same leads in my cheapy meter and it reads correctly see photothanks for the help ill see if there is a way to get it repaired

author: Datman
author_rank: Regular Contributor
timestamp: May 02, 2023, 01:50:21 pm
content: Try moving the selector...
Solartron (Schlumberger) 7150 plus - Page 1
Forum section: electronics / testgear

author: therealovy77
author_rank: Newbie
timestamp: June 08, 2013, 12:28:31 pm
content: Hello! I am Ovidiu from RomaniaI got an Solartron/Schlumberger 7150 Plus for free from a friend as defective (he said that someone tryied to repair it before i get it) and i want to try to repair it.The problem is that it displayFAIL 1. After some research on web, i find a schematic in an maintenence manual on Elektrotanya, and i find some differeces from it:- MCU IC 103 is HD637B01V0P (but it has al sticker on it where writes 7150 / 5251 / BA) instead of HD68P01M0-1 (in schematic diagram)- Non volatile memory IC105 was 93C46 adapted with some wires (instead of NC 7033 in schematic diagram), and IC 106' s place is empty, with no traces of soldering, like it was never before there.Where can i find original memory (memories) for it (i can't find anything on web about original NC 7033)? Can these be replaced with someone else? If so, with what type and where can i find the hex files to program it (them)? And with what interface?If it is necessary, i will post some pictures with the inside of it)Thank you very much.

author: softfoot
author_rank: Contributor
timestamp: July 19, 2021, 08:05:42 am
content: Hi, I know I'm very late (only 8yrs!) replying to this topic ... but I'm desperate !I have a 7150plus that seems to have failing NVRAMs - did you ever find a datasheet for the 7033's ?? I cant find anything at all :-(and I assume they are "unobtainium".Did you ever trace through the wiring of the 93C46 ? if so I'd love to see it.Best regardsDave

author: Chris56000
author_rank: Frequent Contributor
timestamp: July 19, 2021, 01:42:44 pm
content: Hi!Pages 94-97 of this book any use?https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwixn6zooO_xAhUPXsAKHZnPCCcQFjABegQIBRAD&url=http%3A%2F%2Fwww.bitsavers.org%2Fpdf%2Fgtc%2F970005-001_GTC_SW10_Maintenance_Manual_198205.pdf&usg=AOvVaw38DF5H--1oPGoChOySTzOdChris Williams

author: marekm
author_rank: Contributor
timestamp: May 02, 2023, 07:25:59 pm
content: The NC7033 and 93C46 serial protocols (even for read only) seem to be quite different, I don't think it can be done without some additional logic, or firmware modification to work with the new chip (send more bits for read command + address). No traces of soldering may suggest the modification was made by the manufacturer when they could no longer buy the old chips. Interestingly there was no GND pin in the 7033, I/O levels were TTL with only +/-5V supplies.
HP 410C GFI trips fault? - Page 1
Forum section: electronics / testgear

author: wd5jfr
author_rank: Regular Contributor
timestamp: April 30, 2023, 08:28:49 pm
content: Just got a nice clean one off eBay and when I tried to measure the AC line it tripped my GFI. I've never encountered this kind of fault before and can't find anything that would cause this except perhaps the transformer leaking. The schematic shows a grounded shield for pre & sec power transformer windings. The power cord is good by substitution and AC probe lead tests good. Also AC cal doesn't work and chopper is solid state upgrade. Any ideas appreciated.ThanksHank

author: George Edmonds
author_rank: Frequent Contributor
timestamp: May 01, 2023, 01:06:21 am
content: HiIf you want to kill yourself carry on using your HP 410C to measure AC line voltages. This meter has the AC common connection connected to the case work, should you find an AC outlet that is miss wired the meter case will be at AC supply voltage.The GFI trips are warning you of this, don’t be stupid.HP say that this meter MUST NOT be used to measure AC supply voltages.Engage brain and stay alive.G Edmonds

author: coppercone2
author_rank: Super Contributor
timestamp: May 01, 2023, 01:33:12 am
content: https://www.antiqueradios.com/forums/viewtopic.php?f=8&t=273535

author: factory
author_rank: Super Contributor
timestamp: May 01, 2023, 12:04:46 pm
content: Quote from: George Edmonds on May 01, 2023, 01:06:21 amYes I agree this isbadchoice of meter to measure line voltages, its' intended for audio or RF use.I think we all have the same opinion as the members of the HPAgilentKeysight group and Antique Radio forum, the OP also posted this on, don't use it for AC line voltage measurements.But the 410B & 410C manuals only give cautions, if the ground clip is connected to an ungrounded line connection a short circuit will result, also all the metalwork (probe body, chassis) would belive, even worse if the ground wire failed as a result of the short.They state to use the probe tip only,but it would be far better to use a modern DMM with appropriate ratings, than something 50+ years old with possibly degraded/perished insulation in the AC probe leads and metal probe body.David
SPD3303X-E - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: April 28, 2023, 02:31:08 am
content: There does not seem to be a general thread on these power supplies, so I thought I'd start one with a generic enough title to serve as such.That said, I do have a question.I know you can series the two main supplies in this unit to get 64V. My question is, can you then manually series the auxiliary supply to get a total of 69V @ 3.2A?

author: modoran
author_rank: Regular Contributor
timestamp: April 28, 2023, 07:44:31 am
content: No, the 3rd channel is not galvanically isolated, it is derived from the 2nd channel.

author: Performa01
author_rank: Super Contributor
timestamp: April 28, 2023, 08:50:10 am
content: Quote from: modoran on April 28, 2023, 07:44:31 amYou seem to confuse this with Rigol or something.On the Siglent SPD3303X/X-E, all three power sources are independent and galvanically isolated.So the final answer is: yes, we can!

author: tautech
author_rank: Super Contributor
timestamp: April 28, 2023, 10:12:42 am
content: And with a fresh reply from Siglent this picture is proof, admittedly it is a SPD3303C with wired series connections however it clearly shows the 3rd channel with a 5V setting used in the series chain.

author: alm
author_rank: Super Contributor
timestamp: April 28, 2023, 10:45:26 am
content: Quote from: Performa01 on April 28, 2023, 08:50:10 amIndeed, Rigol has a fully adjustable third channel that's not isolated from channel 2, while Siglent has an extremely limited third channel that's fully isolated.

author: tautech
author_rank: Super Contributor
timestamp: April 28, 2023, 10:53:10 am
content: Quote from: alm on April 28, 2023, 10:45:26 amYet, multiple SPD3000X/X-E models can be series'ed together to a max of 500V above mains ground.Done it myself to 120VDC after confirmation from Siglent it is an design feature and accepted practice.

author: daisizhou
author_rank: Super Contributor
timestamp: April 28, 2023, 12:52:22 pm
content: https://youtube.com/shorts/0mKmwa-MJRo?feature=shareDo you know how to adjust my SPD3303D?Especially the voltage of CH1 channel

author: BillyO
author_rank: Super Contributor
timestamp: April 28, 2023, 03:46:44 pm
content: I'm sold. Just put in my order.

author: BillyO
author_rank: Super Contributor
timestamp: May 01, 2023, 02:53:39 pm
content: Look what just came in the door, like, 5 minutes ago:

author: BillyO
author_rank: Super Contributor
timestamp: May 01, 2023, 03:14:31 pm
content: And now a few minutes later ...

author: BillyO
author_rank: Super Contributor
timestamp: May 01, 2023, 04:12:50 pm
content: Hmmm,Is there a way to get EasyPower to remember your device?I guess not. A bit annoying.
TEKTRONIX THS710,THS720,THS730 External Battery Charger Build - Page 1
Forum section: electronics / testgear

author: zyxel13
author_rank: Contributor
timestamp: April 30, 2023, 04:16:32 pm
content: In a Previous Video is showed my 1:1 Drop-in LED Backlight Controller for the THS7xx Series of Tektronix Isolated Scopes.Today I want to show my Design & Build of a External Battery (Accupack) Charger tor these Scopes.It can be Powered either from a Wall-Wart 5V or 12V Power Supply, the default is the 5V PSU with ca. 2Amps. If a 12V one is to be used, a onboard DCDC (Mini360) Buck must be populated along with 2 Caps.I used a Standalone Charger Chip (Asian Brand) that offers all the Features I wanted, the only drawback of this Chip is the limited Status Signaling, just Charging or Charged.This problem I solved with an additional ATTINY85 that takes care of the Signaling using a WS2812 type Intelligent LED.Green Blinking : Battery not detected or not InsertedBlue Steady : ChargingGreen Steady : ChargedRed Steady : Output or Battery shorted or Battery too low inner ResistanceHexcode for Tiny, Steplfiles, STL Files, Gerbers & BOM are available on Request.Attached Pictures and 2 Videos of the Charger Build.Cheers,Konstantin

author: TERRA Operative
author_rank: Super Contributor
timestamp: April 30, 2023, 05:52:14 pm
content: This is really cool.
Saleae Logic Analyzer - Manchester Decoding  - Page 1
Forum section: electronics / testgear

author: SirrCharles
author_rank: Newbie
timestamp: April 30, 2023, 09:12:31 am
content: Hi There,I'm trying to decode a simple Manchester signal using Saleae Logic AnalyzerI'm sending 8 bits 11111111 from my microcontroller.My period is 10 mS and my signal is 1010101010101010.So the frequency should 100 HzThe total signal period for al 8 bits is 80 mSWhich should convert to 11111111 in Manchester code.I've set the bitrate to 100 bits per second.But the Saleae Logic Manchester decoder doesn't work.What am i doing wrong?Thanx in advance!

author: RoGeorge
author_rank: Super Contributor
timestamp: April 30, 2023, 12:18:09 pm
content: Don't have Saleae, but I've tried with a sigrok based decoder, and it just works.Install PulseView and try to use your logic analyzer from PulseView. Trigger on first rising edge, then add an OOK decoder for Manchester decoding.

author: SirrCharles
author_rank: Newbie
timestamp: April 30, 2023, 01:40:56 pm
content: I noticed that only with 00000000 or 11111111 Saleae doesn't detect the Manchester code.If one bit is added to 00000000 for example 00100000 it will detect.If one bit is added to 11111111 for example 11111101 it will detect.Parity BitI've added a 9th parity bit at the end of the 8-bit sequence.When even add 1When sum is 0 add 1When uneven add 0With a parity bit it seems to work for some strange reason.11111111 & 00000000 are valid values for a byte and should be detected by the analyzer.

author: SirrCharles
author_rank: Newbie
timestamp: April 30, 2023, 01:44:32 pm
content: Quote from: RoGeorge on April 30, 2023, 12:18:09 pmThanks for going trough the effort of simulating this.I downloaded PulseView but mySaleae Logic 8is not supported onlySaleae Logic 16as it looks from the dropdown menu.

author: horo
author_rank: Regular Contributor
timestamp: April 30, 2023, 02:07:15 pm
content: It is supported as well as all the cheap 8 and 16 channel clones!1. Chose the driver fx2lafw (generic driver for FX2 based LAs) (fx2lafw)2. Chose USB3. Scan for devices4. Select Saleae Logic with 8 channelsUSB IDs:Saleae: idVendor=0925, idProduct=3881Clones: idVendor=04b4, idProduct=8613