hybridfree/eevblog-posts huggingface dataset:
Help needed with Option 05 board for Tektronix 2465 oscilloscope. - Page 1
Forum section: electronics / testgear

author: Ashen
author_rank: Newbie
timestamp: May 17, 2022, 06:56:18 am
content: Hello everyone!Not long ago i've decided to add a TV option to my old 2465 buddie. Found a reliable seller on eBay, placed an order, after some time received a board and after it's installation i realized that it doesn't work properly - my 2465 hangs if i try to activate TV option. During some research i found that TV board i've got has a ROM for 2465A, whoch won't work with my 2465 at all - boards are almost the same, except last numbers in it's revision - 670-7784-XX. Installed U5565 ROM has a 160-3677-03 version, while i need a ROM dump for 2465 with 160-2216-XX version programmed in it.It would be so kind, if anyone with 2465 oscilloscope with TV option 05 board will dump and share it's U5565 ROM. Required version, as i've said is 160-2216-XX (XX is revision of ROM).Yes, i've checked already w140.com website for this ROM, sad to admit it's not available here. As well as ROM i've got on my board, 160-3677-03, which i'll try to provide there to preserve it for future.Thanks in advance, i really hope that there will be somebody, who'd be able to help me with this ROM image ^_^

author: Ashen
author_rank: Newbie
timestamp: May 27, 2022, 08:11:17 am
content: Bumping up thread. Firmware is still required.

author: bryonvp
author_rank: Newbie
timestamp: June 06, 2022, 09:39:23 am
content: Hi. I might be able to help. In the process of dismantling and cleaning a flood damaged 2465 with 05 and 09 option boards. I’ll have a crack at copying the EPROM.Mine has 160-2216-02I might need some help from you as well - I failed to take a photo of the A B C D E cables coming into the top board. B is a 2 pin connector, but goes into a 2x5 pin header. If you can send a photo would be appreciated.Cheers

author: tautech
author_rank: Super Contributor
timestamp: June 06, 2022, 09:45:33 am
content: Quote from: bryonvp on June 06, 2022, 09:39:23 amWelcome to the forum.For finding nearly all things 2465 this thread is pretty good:https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/

author: bryonvp
author_rank: Newbie
timestamp: June 06, 2022, 10:00:27 am
content: Thanks tautech - help appreciatedShould have joined here years ago!
Looking for suggestions for a cheap electronic load - Page 1
Forum section: electronics / testgear

author: gardner
author_rank: Regular Contributor
timestamp: June 03, 2022, 01:49:57 am
content: I am increasingly using my cheap and cheerful electronic load. I have one of those crappy ones designed to test USB PSUs and batteries. It works on DC from ~5V to ~20V and will dissipate around 25W without melting.https://www.amazon.ca/gp/product/B08HRLRSHVIt has some problems though, and I'm wondering if folks here know of a slightly better hobby grade unit I should look at. It would be nice to have something in a case/housing with sensible documented settings and functionality. Binding posts for connection maybe. It would be nice if it could run off a separate supply than the SUT -- maybe a 9V battery or something.I will likely have a bash at relocating the controls on this one onto a sensible faceplate, add binding posts and so forth. But if there's something I could just buy for another $30 to $50, I would take that, I think.

author: ledtester
author_rank: Super Contributor
timestamp: June 03, 2022, 02:25:57 am
content: This isn't such a bad electronic load:https://www.amazon.com/Electronic-Battery-Capacity-Constant-60mmx88mm/dp/B082F36D3TThere's also a 110W version but you may have to go to aliexpress or ebay to get it.Main limitation is the 30V max. voltage. Also it doesn't have convenient plugs for testing USB power supplies like some other loads have but it does a good job for its specifications.There was a recent thread on the DL24P which is kinda in the same category:https://www.eevblog.com/forum/testgear/cheezeball-dc-load-dl24p-pump-or-dump/msg4186963/#msg4186963

author: BradC
author_rank: Super Contributor
timestamp: June 03, 2022, 08:51:40 am
content: I have one of these :https://www.skyrc.com/Discontinued_Products/BD200USB controlled, 5-35V 0-30A and 200W. I've run it flat stick discharging battery banks for many, many hours.Their software sucks, but it wasn't hard to reverse engineer and write some python to run it and create csv logs.

author: LinuxHata
author_rank: Frequent Contributor
timestamp: June 05, 2022, 02:20:57 pm
content: I have this kit.https://aliexpress.ru/item/32859047052.htmlIncluded transistors are crap, discard them immediately. And use beefier ceramic resistors instead of included ones, if you plan to dissipate 100W+ on it.I've upgraded mine with big IGBT transistors with large SOA (Got them from industrial grade UPS), so mine now can safely do up to 300W (maybe even more, just haven't tested) at voltages up to 400V.

author: Trader
author_rank: Frequent Contributor
timestamp: June 06, 2022, 08:09:46 am
content: DL24 150W 20A DC Power USB Tester Electronichttps://s.click.aliexpress.com/e/_ANkTstI use this one, has: Fixed Current, or Voltage, or Resistance, or Power.
Need  HP E1410A 6.5digit dmm VXI module service manual with the schematics - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: March 31, 2019, 01:58:38 pm
content: Hi @llTitle says it all, i searched tons of sites, dl ded many pdf manuals, but never found a complete one with the needed schematics, does it exist ?thks

author: HighVoltage
author_rank: Super Contributor
timestamp: March 31, 2019, 03:31:23 pm
content: I never had one of these.Can you make a teardown and post some detailed pictures of the PCB?I heard it is very similar to the 34401A in schematic, may be even part of the layout.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 01, 2019, 02:12:20 am
content: the nearest 34401 equivalent is the : HP/Agilent/Keysight 34970A if it has the dmm section already installed, but it will go up to 300v ac or dc, and for the reference it use an ic, not the lm399.For the VXI E1410A i was hoping to find a schematic before buying one ...

author: HighVoltage
author_rank: Super Contributor
timestamp: April 01, 2019, 08:43:40 am
content: One would expect a full service manual with schematics for this older HP/Agilent instrument but I also can not find anything.

author: Echo88
author_rank: Frequent Contributor
timestamp: April 01, 2019, 01:17:00 pm
content: Since both the user- and the service-manual dont mention schematics in their Content-chapters im thinking they were never published.I own such a E1410A and should have photos somewhere on my PC, but here are also a few photos of it:https://translate.google.com/translate?hl=de&tab=TT&sl=ru&tl=en&u=http%3A%2F%2Fm.radiokot.ru%2Fforum%2Fviewtopic.php%3Ff%3D10%26t%3D52829%26start%3D2600

author: Kleinstein
author_rank: Super Contributor
timestamp: April 01, 2019, 04:24:09 pm
content: From the pictures shown in the link, the DMM looks more like the 3457 - so a bit older than the 34401.

author: HighVoltage
author_rank: Super Contributor
timestamp: April 01, 2019, 04:32:47 pm
content: Thanks for the link to the pictures,It seems to have the reference board from the 3456, so really a much older design.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 01, 2019, 05:06:45 pm
content: Thks for the pics linksYeah my toughts, seems to be a mix of other dmm technologies, the hybrid chip seems similar to the 3468 and 3478 meters lollThe lm399 board is from the 3456, used in the 3457 too, Dave did a teardown, check its first part number 03456 -

author: hgl
author_rank: Regular Contributor
timestamp: October 13, 2019, 07:38:49 pm
content: Maybe the schematics of HP E1412A can help you

author: hgl
author_rank: Regular Contributor
timestamp: October 13, 2019, 07:47:31 pm
content: E1412A Schematics

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: June 05, 2022, 06:49:15 pm
content: Quote from: coromonadalix on March 31, 2019, 01:58:38 pmHi,have an original service-manual (E1410-90010) here, no schematics.Maybe there is a "component-level manual" out there.Imho E1410 ~HP3457A, E1411 ~HP3478A, E1412 ~HP34401
Agilent 34410A firmware - update risks and Mac compatibility? - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: June 04, 2022, 10:12:54 am
content: I have FW 2.35.Three questions:1. Is it worth updating to 2.43?2. If I do,and given I have 2.35, will i lose calibration?3. Is it possible to update FW via a Mac OS?Thanks.

author: bd139
author_rank: Super Contributor
timestamp: June 04, 2022, 10:49:07 am
content: Despite being a mac user myself I wouldn't futz with firmware on a device remotely directly with it. Especially when the software is vendor provided for windows. I have a junker PC around for that stuff.I can't answer question 1 but on 2 it says on the download page that it doesn't affect the calibration:https://www.keysight.com/gb/en/lib/software-detail/instrument-firmware-software/34410a-dmm-firmware-1299517.htmlRealistically if something isn't broken I wouldn't try and fix it. My 34401A firmware is 1999-ish

author: AVGresponding
author_rank: Super Contributor
timestamp: June 04, 2022, 10:53:11 am
content: Don't Keysight provide patch notes for these updates, so you can see what the changes are?

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: June 04, 2022, 11:11:04 am
content: For 2.41 and 2.43 it does say "Note: There is no need to re-calibrate the DMM when this new firmware is installed."But the Release notes for 2.35 - 2.39 tantalisingly include " Corrected calibration data and state storage issue involving instrument non-volatile memory"And since you cannot see install instructions for anything back past 2.41 this all caused me to wonder if there was a risk to cal data.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: June 04, 2022, 11:17:04 am
content: What I should also have asked was:"Without 2.41+ am I correct that I cannot use the LAN either as prior FW is not compatible with Java 8?"Hence my dilemma...

author: blubillcanada
author_rank: Contributor
timestamp: June 05, 2022, 01:45:45 pm
content: Why not install Bootcamp? You can always uninstall it when you're done.
Why does Waveform Generator come with these huge damping things? - Page 1
Forum section: electronics / testgear

author: dastructhm
author_rank: Contributor
timestamp: June 05, 2022, 05:20:25 am
content: I couldn't figure out why. Does anyone know the answer?I don't see other measuring instruments come with these huge things. Why?

author: Brumby
author_rank: Unknown
timestamp: June 05, 2022, 05:48:45 am
content: Rubber baby buggy bumpers. They help protect the unit, but they also enable stable stacking.Your will see them on other Rigol kit as well.

author: pope
author_rank: Frequent Contributor
timestamp: June 05, 2022, 07:30:38 am
content: Siglent also have them. I don't like them. I remove them from my gear.

author: Someone
author_rank: Super Contributor
timestamp: June 05, 2022, 07:52:11 am
content: Quote from: Brumby on June 05, 2022, 05:48:45 amI think they make stacking worse, so remove them.

author: RoGeorge
author_rank: Super Contributor
timestamp: June 05, 2022, 08:53:03 am
content: Often, in the field or in an industrial environment, the environment can be brutal when compared with a lab environment. Reasons to have the bumpers:- protection during packing/moving/shipping- shock and vibrations absorbent after installation- lock stacked instruments against sliding- keep minimal distance between stacked instruments, for a good airflow/cooling- permit the instrument to sit in any position, for example on one side, or vertically sitting straight on the floor- to pass standard certifications, some specify dropping the instrument on its corner from a certain height, etc.Corner bumpers may be very useful, but can be removed if not wanted.

author: tautech
author_rank: Super Contributor
timestamp: June 05, 2022, 09:34:00 am
content: Quote from: dastructhm on June 05, 2022, 05:20:25 amBecause some manufacturers would rather see your instrument get damaged for you to buy parts or replace it.Who are they or us to say where equipment might get used or carted around to so it might get damaged in transit which then makes your 'other measuring instruments' not really fit for such purpose does it not ?Bumpers are fixed with screws to enable removal and the tilting bail is also easily removed if you really want the bare bones look to match your 'other measuring instruments' that have limited physical protection.RoGeorge sums it up perfectly.

author: jonpaul
author_rank: Super Contributor
timestamp: June 05, 2022, 09:41:39 am
content: Chinese knockoffs of original HP design, eg on 34465a DVMsBut the original HP surrounds are far better design and constructionJon
Buy a Chinese language only osc for cheap?? - Page 1
Forum section: electronics / testgear

author: Suzook
author_rank: Contributor
timestamp: June 03, 2022, 09:21:25 pm
content: I have a lead on an old Chinese fw locked osc. I will only use it a few times. Thoughts??? Or just spend the extra $150 for a newer one?

author: thm_w
author_rank: Super Contributor
timestamp: June 03, 2022, 09:30:18 pm
content: You haven't bothered to post the price or the model number.If its a $500 oscilloscope and 150 for english, I would just pay the extra.

author: Suzook
author_rank: Contributor
timestamp: June 03, 2022, 09:33:42 pm
content: Owon Digital Oscilloscope EDS102CV 2 CH 100MHz vs FNIRSI-1014D for another $150, which is new, and a different model. I'm just a hobbyist.

author: thm_w
author_rank: Super Contributor
timestamp: June 03, 2022, 10:09:00 pm
content: https://www.eevblog.com/forum/testgear/owon-eds102cv-100m-vga-english-software/

author: tunk
author_rank: Super Contributor
timestamp: June 03, 2022, 10:10:21 pm
content: You can get the 1014D from eBay and aliexpress at 170-180$, so if the owon is 20-30$ ...

author: Suzook
author_rank: Contributor
timestamp: June 04, 2022, 12:55:05 am
content: I saw that, but never got an answer if can be flashed to English

author: Suzook
author_rank: Contributor
timestamp: June 04, 2022, 12:57:20 am
content: So just get the 1014d? That's what I'm leaning towards. The owan is $100

author: thm_w
author_rank: Super Contributor
timestamp: June 04, 2022, 01:07:23 am
content: Quote from: Suzook on June 04, 2022, 12:55:05 amRead the last post.

author: Suzook
author_rank: Contributor
timestamp: June 04, 2022, 01:12:12 am
content: I did. No definitive answer.

author: pcprogrammer
author_rank: Super Contributor
timestamp: June 04, 2022, 08:00:46 am
content: Be aware that the FNIRSI-1014D is lying about the specifications. Bandwidth <30MHz, Sample-rate 200MSa/s at best, Memory-depth 3000 samples per channel at best. Hardware sensitivity 100mV per division with 1x probe and 1V per division with 10x probe. AWG has fixed output amplitude. No protocol decoding.Not a problem if these specifications are in range with what you need, but when you expect more of an oscilloscope don't buy the FNIRSI-1014D.In the same class there is also the Hantek DSO2 range of oscilloscopes like the DSO2D10 to get better performance then the FNIRSI-1014D.

author: Suzook
author_rank: Contributor
timestamp: June 04, 2022, 09:57:44 am
content: Only need it to check vintage receivers. Don't need anything fancy. I can get the Chinese owon for $100, hence my dilemma. Unit will be used a few times a year.
Dick smith Q1803 Oscilloscope - Page 1
Forum section: electronics / testgear

author: samson
author_rank: Contributor
timestamp: June 04, 2022, 05:35:58 am
content: Hi, I have a Dick Smith Q1803 Oscilloscope and when I turn it on there is no green trace on the tube.Triggering is working but no display. It was working only for a while and know it is blank tube.The tube lights up on the back and that is about it.Any help please.

author: wilfred
author_rank: Super Contributor
timestamp: June 04, 2022, 06:08:09 am
content: You've checked the intensity is not on minimum? And adjusted the vertical position to make sure the trace hasn't moved beyond the top or bottom of the screen?Also set the time/div to something that will give a line rather than a moving dot.I did find this which might offer a few things to try.https://www.austech.info/showthread.php/89126-DSE-Q1803-10Mhz-Oscilloscope-RepairGood luck with it.
Much better FFT for Rigol Scope data - Page 1
Forum section: electronics / testgear

author: bb1
author_rank: Regular Contributor
timestamp: June 02, 2022, 05:57:26 pm
content: Built-in FFT of Rigol scopes such as DS2000a has low resolution and dynamic range, as can be seen on the attached internalFFT_1Vpp_47MHz.png.This screenshot shows best possible resolution of about 0.5 MHz at the input frequency of 47Mhz and sampling rate of 100MS/sec.At the input signal of 1Vpp the FFT dynamic range can be estimated as 60 db.Limited dynamic range very clearly affects visibility of the same 47 MHz signal with the low amplitude of 0.1 mVpp, as can be seen oninternalFFT_0.1mVpp_47MHz.png.The 0.1 mVpp signal on 50 ohm input cannot be distinguished from the noise in the waveform at the lowest real scope sensitivity of 1 mV/div, but the internal scope FFT still shows the signal about 10 db above the noise.Much better dynamic range and FFT resolution can be obtained by downloading scope data to PC and calculating FFT using, for example, Python.The attachedgetDataFromRigolScopeAndShowFFT.pydoes download the data from the Rigol scope and shows final FFT of the same 47 MHz, 0.1mV signal. The zoomed view of the resulting FFT around 47 MHz frequency is shown on simple_FFT_1.4Mpoints_0.1Vpp_100MSs_50ohm.png.We can see that for 1.5 Mpoints waveform the FFT resolution is definitely better than 500 Hz (1000 times improvement).The signal/noise ratio is about 40 db (30 db improvement).Unfortunately, Rigol firmware is buggy and slow. In the Python program I tried to go around the bugs, but the download speed is still low. It takes 10.5 sec to download 1.4 Mbytes. Interestingly, it still takes 2.3 sec to download 140K points waveform.
Dangerous APPA DC mV bug or just a glitch? - Page 1
Forum section: electronics / testgear

author: Bobson
author_rank: Regular Contributor
timestamp: June 11, 2022, 08:06:23 pm
content: Playing with new PSU I ran across strange behavior of an APPA 109N DMM. While measuring 19V DC output of PSU, I switched DMMs rotary to mV range to see AC byproduct (I know it would be wrong with DC offset so high, but intended to drop voltage after) and mistakenly pressed MODE (AC->DC->AC+DC) button instead of LIGHT. I was really astonished that in DC mV mode my venerable APPA 109N gave me several mVs instead of OL. When I dropped voltage down to several volts, it started displaying OL. I repeated it several times, and it was not a temporary glitch, always repeating.Disappointed, I repeated the sequence with rather similar model, APPA 305. It has DC mode default in V and mV ranges, but results were the same. APPA 506 has separate DC and AC Volts and millivolts, and has NO glitch.I wonder if this bug-or-feature present on another APPA models, including 10x series and 20x series? (208 is actually benchtop version of 506, while 201-207 are benchtop versions of an older 300 series).Attached photos show 3 DMMs in DC V mode, 2 APPAs in dc mV mode, all three in DC mV mode. U1252A used as a ref.
Fluke 1520 megohmmeter help - Page 1
Forum section: electronics / testgear

author: Lemlife
author_rank: Newbie
timestamp: June 03, 2022, 10:58:41 am
content: I have a fluke 1520 that someone gave me, probably because it doesn't work. I put some new batteries in it and it is dead to the world. No response, no sound, no display. The terminals look good, I opened it up and didn't see anything that was burnt or broken. Does anyone have any experience with these units? Are there some basic components I can check to see if it's something repairable? I have a fluke 1507 and it works great, use it all the time. I know the 1507 is a newer model and all. It I was just wanting to add the 1520 to my collection. I'll bet fluke wants more to repair it than I could buy a used working one online. Anyhow, I have searched the forums and only saw a couple of posts. And I can't find much info online about this particular unit. Any help is much appreciated. Thanks!
RuoShui 4091C max capacitance? 99uF? - Page 1
Forum section: electronics / testgear

author: aronake
author_rank: Frequent Contributor
timestamp: June 03, 2022, 05:04:18 am
content: Hi,Anyone know the max capacitance RuoShui 4091C can measure?The data sheet say 99.999uF which sounds very low.http://victorruoshui.com/productinfo/136957.htmlFor the lower models in the 4090 series, the data sheet say 99.999mF, so a factor 1000.http://victorruoshui.com/productinfo/105228.htmlI suspect there is an error on the datasheet of RuoShui 4091C
Agilent 34410A - thermocouple options - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: June 02, 2022, 03:52:33 pm
content: Try as I might, in spite having 'registered, the Keysight website seems to require re-entering all the data they already have to download any spec sheets or information.So, my question is : I have a number of K type devices, but am I correct they cannot be used with this meter?Related to this, what would anyone advise as the best TC option?Thank you.

author: strawberry
author_rank: Super Contributor
timestamp: June 02, 2022, 04:57:04 pm
content: PT1000 in ohms mode

author: mzzj
author_rank: Super Contributor
timestamp: June 02, 2022, 06:04:41 pm
content: You can "sort of" use thermocouple but you have to questimate the cold junction temperature by yourself and calculate temperature from the voltage.Only B-type thermocouple would work without cold junction compensation but it is pretty much useless below 400 C and cost-prohibitive (made of platinum-rhodium alloy)
Using Keithley 2380-120-60 with pyvisa - Page 1
Forum section: electronics / testgear

author: ddh67
author_rank: Newbie
timestamp: June 02, 2022, 12:15:02 am
content: Hi, I am trying to get my PC to recognize my keithley 2380-120-60 via usb. Can someone post the correct drivers? Tried using these but didnt work Keithley2380-1.0.0.
UNI-T UTD 2102CEX II vs Hantek dso2d15 what should i buy - Page 1
Forum section: electronics / testgear

author: OwaisAhmed
author_rank: Contributor
timestamp: January 10, 2022, 09:36:07 pm
content: i was looking for my my first oscilloscope. i did alot of research this is the only 2 oscilloscope i could have find which is best according to performance to price ratio. my usage will be diagnosing pc motherboard laptop motherboard gpu power supply. and i'm also learning electronic engineering and also need it to check my project and circuit. did anybody have any experience with above 2 scope or do you have any other suggestion for oscilloscope with 250$ range bandwidth of 100mhz atleast..

author: simba15
author_rank: Regular Contributor
timestamp: January 11, 2022, 04:12:07 pm
content: I would stick to the Hantek or look at similar Siglent or Rigol units.Those 3 seem to be the top players in low cost bench scopes.

author: Algoma
author_rank: Frequent Contributor
timestamp: January 11, 2022, 05:03:12 pm
content: Hantek's Hardware works as descibed, and they're making progress working out the software issues we've found so far.Not sure about Uni-T, its appearance indicates its been espcially cut down to a cost.. I can only imagine the inside.Quick look at a vew videos - hardware looks good for the price, nice power supply compared to Hantek, not sheilded though., eww for the fan.. Software interface side looks terrible.Definitly spend a bit more for a Siglent if you can..

author: arturmariojr
author_rank: Contributor
timestamp: June 15, 2022, 10:36:17 am
content: I hope you have not bought the Hantek DSO2D15 - the most beautifull of them but really a trash.Don't believe on their description or capabilities - they just don't work as they say.Best wishes!Artur
Yaesu YC-355D Frequency Counter Teardown & Test - Page 1
Forum section: electronics / testgear

author: intabits
author_rank: Frequent Contributor
timestamp: June 01, 2022, 11:32:58 am
content: From a recent hamfest.It needs a little maintenance, but this 48 year old unit is still very accurate.The insides, mostly using 7400 series logic ICs.Video:-
Ultrasonic cleaner, recommendation? - Page 1
Forum section: electronics / testgear

author: boyddotee
author_rank: Contributor
timestamp: May 31, 2022, 07:15:10 pm
content: Not sure this is the right forum thread. But wondering if anyone has any updated recommendations on ultrasonic cleaners for use in electronics? Budget is flexible but at the same time I don't want to spend thousands 😅Looking for something that would work for a 20x20cm PCB.I've only found 1 previous post on eevblogs forum via google, which is slightly surprising?
Wavetek 3001/2 signal generator - Page 1
Forum section: electronics / testgear

author: Davy
author_rank: Regular Contributor
timestamp: May 31, 2022, 03:27:35 pm
content: I repaired this a while back, it had 10uF tant. capacitor problems robbing one of the +18 and -18V supplies, it had worked ever since. I came to use it and nothing came out, I traced this to IC3 an MC1458 dual op-amp on the meter board, this feeds the pin diodes attenuator in the output module MW10-9, this brought the unit back to life but.... confusion sets in-:The frequency is accurate down to the last Khz, even at 560MZ yet it range is 1-520Mhz, the accuracy light flashes in both calibrated and uncalibrated mode, this was traced to pin 9 on the Wide oscillator lock M34 modual, the unlock pin, this is being held 'high' causing the flashing error signal, yet all the PLL unlock LED indicators are not lit indicating a lock condition.The output RMS meter reading voltage corresponds to the P-P scope readings, I would expect the frequencies would be wrong, and at least one or more unlock LEDs to be lit - this does happen when I disconnect various modules, eleminating a faulty LED or anything like that.Could someone throw some light on this? Apart from the flashing error indicators I'm getting out what I dialled in. Theres a jack on modual M34 marked ' Video TP, whats this test point?Thanks, Dave
Keithley brown paint code? - Page 1
Forum section: electronics / testgear

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 14, 2022, 08:49:21 am
content: Is there a Keithley brown paint code? My search has not turned one up, I wonder if this has been tracked down.

author: AVGresponding
author_rank: Super Contributor
timestamp: May 14, 2022, 09:50:51 am
content: Is it not just number two..?

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 14, 2022, 10:33:48 am
content: Not far off

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: May 28, 2022, 12:46:33 pm
content: Hi,maybe RAL8016 (mahogany brown)?https://ral-chart.co.uk/brown/Sounds and looks best for me....

author: xrunner
author_rank: Super Contributor
timestamp: May 28, 2022, 12:48:48 pm
content: Quote from: mapleLC on May 14, 2022, 08:49:21 amTake your meter in to the paint desk at Home Depot.Ignore the odd looks ...

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 28, 2022, 09:08:14 pm
content: Quote from: Roehrenonkel on May 28, 2022, 12:46:33 pmWhat is RAL? Is that like PANTONE?

author: nightfire
author_rank: Frequent Contributor
timestamp: May 28, 2022, 09:43:08 pm
content: Yes, RAL is the german/european equivalent of Pantone in the US

author: tooki
author_rank: Super Contributor
timestamp: May 29, 2022, 01:25:49 pm
content: Quote from: nightfire on May 28, 2022, 09:43:08 pmNot exactly. They both deal with color standardization, but are not equivalents. RAL is for paints, coatings, and plastics, whereas Pantone’s primary focus is print and digital (though they also do other things). Pantone is extremely widespread in the graphic arts worldwide (including Europe), not just in USA, and RAL is common worldwide for industrial coating applications.

author: tooki
author_rank: Super Contributor
timestamp: May 29, 2022, 01:27:00 pm
content: Quote from: xrunner on May 28, 2022, 12:48:48 pmThis. Any halfway decent paint store nowadays has a spectrophotometer or colorimeter they can use to scan a color sample and recreate it in paint.

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 29, 2022, 01:32:10 pm
content: Quote from: tooki on May 29, 2022, 01:27:00 pmI was looking for an original or factory color, something that is repeatable based on that. I could take a cover into the hardware store, but that is 20 or 40 year old paint, and a different color from the original paint color.

author: tooki
author_rank: Super Contributor
timestamp: May 29, 2022, 01:37:51 pm
content: Just find a section of the original housing that was concealed and scan that.

author: mapleLC
author_rank: Frequent Contributor
timestamp: May 29, 2022, 01:45:16 pm
content: thats not a bad idea, or an old new stock part would be a close approx.
Type of connector? - Page 1
Forum section: electronics / testgear

author: Jackob
author_rank: Contributor
timestamp: May 29, 2022, 06:51:03 pm
content: HelloDoes anybody know what type of connector is used at the backside of the N-flange where the semi-rigid coax enters into the N-flange (the gold plated part - see the picture) - or is there any connector used at all? This is the front panel connector assembly from my R&S SPA and I did not want to try to unscrew it without asking first…Br, Jackob

author: TurboTom
author_rank: Super Contributor
timestamp: May 29, 2022, 07:18:10 pm
content: I guess this is part of this type of N-type bulkhead connector and not an individual connector by itself. You may want to have a look at the Huber Suhner catalog for reference:https://literature.hubersuhner.com/Technologies/Radiofrequency/RFConnectorsEN/?page=382

author: Jackob
author_rank: Contributor
timestamp: May 29, 2022, 08:02:42 pm
content: Thanks a lot TurboTom
Matsuada AU-3P400 High Voltage Power Supply - Teardown and Testing - Page 1
Forum section: electronics / testgear

author: intabits
author_rank: Frequent Contributor
timestamp: May 28, 2022, 02:26:16 pm
content: Matsuada AU-3P400 High Voltage Power Supply: 3KV @400mAI bought this device at a recent hamfest. It turned out to be different from what it was advertised as, but still a nice unit, and probably more useful anyway.Video of teardown and some simple testing:-
line splitter compatible with Fluke 80i-110s current clamp? - Page 1
Forum section: electronics / testgear

author: mightyohm
author_rank: Regular Contributor
timestamp: May 27, 2022, 11:42:54 pm
content: The common Fluke current clamp has a fairly small diameter opening in the clamp. (About 1/2" dia.)It's too small to fit the commonly available line splitters (Wavetek ELS2). This seems like an oversight by Fluke.Does anyone know of a line splitter with an unusually small cross section that fits inside the Fluke 80i-100s current clamp?Edit: Looks like the newer Micsig current clamps have the same issue. The CP2100B has a 13mm opening, same as the Fluke.
Little Escort/Agilent DMM continuity feature [not quite a hack] - Page 1
Forum section: electronics / testgear

author: Bobson
author_rank: Regular Contributor
timestamp: May 28, 2022, 08:55:35 am
content: Continuity buzzer starts much faster in diode testing mode compared to dedicated ohms buzzer.At least on my Escort 97 and Agilent U1252A.Can you prove or disapprove it?
TDS754D fail ++ processor, splash not shown - Page 1
Forum section: electronics / testgear

author: Galen
author_rank: Regular Contributor
timestamp: May 27, 2022, 07:01:41 am
content: Dear all, My TDS754D show fail++processor today, and the splash screen not shown. after that, it react very slow for button-push, the trace appears very slow, trigged led flash, sometimes after a short while, some mussy wave appear on screen, then a while, the scope dead there, no response anymore. It works well before today, although it was not used too much.But, interesting thing, I opened it, tried to measure frequency near the 24M TCXO, the splash screen appeared! and passed all test! everything looks good. but a short while, the scope start slow again, then dead. Maybe the crystal problem? so re-solder the crystal, no lucky.Btw, I replaced the 24C02 - U1052 and U1055 at Acq board, write the Cal backup into it. no lucky. replaced the NVRAM, no lucky.Very appreciate your advice.Galen

author: Galen
author_rank: Regular Contributor
timestamp: May 27, 2022, 09:36:19 am
content: Add the observation during my many times trying to boot this scope.1. Splash screen not shown up2. then 'Fail ++ Processor' show up3. after pushed 'clear menu', the scope run very slow, 1-2 traces can not appear immediately.4. all screen display also slow. SPC message shows up line by line, error log also shows line by line, like what you see when you type 'dir' at an old IBM PC.5. the error message says 'dspAddrConfd1.... '.6. after a while, the scope dead, no response anymore.

author: Galen
author_rank: Regular Contributor
timestamp: May 27, 2022, 09:38:04 am
content: attachment
Does anyone have the HMO3034 / HMO30X4 osc firmware? - Page 1
Forum section: electronics / testgear

author: ozcanveli
author_rank: Newbie
timestamp: May 24, 2022, 01:22:14 pm
content: Hello how are you. I have an HAMEG HMO3034 osc. Current firmware version is "Firmware V06.005" and this version is causing problems with osc. Do you have the old version "V05.407" or "V05.520"? If so, can you share mine?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 24, 2022, 02:54:04 pm
content: Have you asked Hameg for an older firmware version ?

author: ozcanveli
author_rank: Newbie
timestamp: May 25, 2022, 09:53:53 am
content: Quote from: coromonadalix on May 24, 2022, 02:54:04 pmYes I did before but no response from Rohde & Schwarz. That's why I'm asking the forum.

author: morris6
author_rank: Regular Contributor
timestamp: May 26, 2022, 02:18:12 pm
content: Found HAMEG_FW_HMO_30X4_05_522.zip in my archive. Is this what you are looking for?Size is 9044 KB, to big to post here. Any place to upload it if you want it?

author: ozcanveli
author_rank: Newbie
timestamp: May 27, 2022, 07:05:17 am
content: Quote from: morris6 on May 26, 2022, 02:18:12 pmthank you very much @morris6. my mail ozcanveli@gmail.com.
Graphing Allan Deviation of keysight 53230a using Excel VBA - Page 1
Forum section: electronics / testgear

author: kan573
author_rank: Newbie
timestamp: May 27, 2022, 04:24:31 am
content: Hi all,I have created a VB script (.xlsm) to plot the Allan deviation using Keysight 52320A.The VB script measures and fills in the Allan deviation values with respect to the gate times in the table.The minimum gate time value that could be set was 0.000001 seconds, so the measurement starts there.From the results of plotting the values, I obtained the following results.Looking at the figure, it appears that the Allan deviation in 53230A is calculated by acquiring data with a minimum tau0 = 0.00001 second.In this, 10 MHz clock is measured.Attached is the VB script (.xlsm) I created and plots of several oscillators I measured.It can be used on a Windows PC with keysight's IOLibSuite_18_2_27313.exe and Excel 2013 or later installed.I used the 53230A with OCXO.The Allan deviation value units obtained from the 53230A appear to be smaller than values from other instruments.The values read from the 53230A are graphed as is.

author: kan573
author_rank: Newbie
timestamp: May 27, 2022, 04:26:45 am
content: How to use:First, set the VISA Address of the 53230A.Use the radio buttons to select the AC output signal with 50Ω termination or the CMOS signal connected by a 10:1 probe.Press the Start Measuring button.The script process is as follows:From the table, read the gate time and the number of samples acquired and set them to 53230A.Start the measurement and read the calculated Allan Deviation value.Use the RCON mode instead of the CONT mode because the CONT mode may produce strange peaks in the graph.To minimize measurement error, take as many samples as possible and obtain averaged values.However, it must be a value that will end the measurement in a reasonable time.In places where gate time is large (at the bottom of the table), measurement takes a long time.Therefore, the number of samples is kept small.In the standard case, when acquiring up to gate time = 100s, the measurement time is about 6 hours.

author: kan573
author_rank: Newbie
timestamp: May 27, 2022, 04:29:32 am
content: Customization:You can reduce the number of measurements by cutting the bottom row of the table.The measurement time will be dramatically shortened.The number of samples and tau can be changed.It is also possible to set a longer tau.In this case, the timeout value must also be increased.Additional note:The measurement method above is a bit different from the usual method of calculating each tau value from a single lumped data sequence.However, it appears that a reasonably valid graph can be drawn.Looking at the measurement data, it seems that it is not a good idea to expect the performance of a used VC-OCXO.
What is the difference between the Fluke 116 and 116c? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 25, 2022, 08:16:59 pm
content: I came across a manual said for the Fluke 116c. It seems identical to the 116 so why the letter c?

author: coromonadalix
author_rank: Super Contributor
timestamp: May 26, 2022, 06:44:21 am
content: Was the C for chineese contry, or made in that country ??

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 26, 2022, 09:39:56 am
content: I now think it means for China market.

author: daisizhou
author_rank: Super Contributor
timestamp: May 26, 2022, 10:37:08 am
content: Yes, the ones with the letter C behind them represent the Chinese market.Some versions of the PCB may differ.performance may be low,But there is no absolute, you need to compare each model carefully to know

author: Fungus
author_rank: Super Contributor
timestamp: May 26, 2022, 10:51:02 am
content: Quote from: daisizhou on May 26, 2022, 10:37:08 amOTOH they might be identical and the 'C' is just there to be able to identify grey imports (the 'C' model will be cheaper so people will try to import them into the west and sell them for full price).
Hameg 604 No Second Channel Trace or Beam. - Page 1
Forum section: electronics / testgear

author: mluhar
author_rank: Newbie
timestamp: May 24, 2022, 04:38:47 pm
content: Hi Members,I have got a Hameg 604 Oscilloscope. I was given this scope by my brother-in-law. When I got it I switch it on and everything is working except channel two trace, (channel one fine). He also gave me a service manual. I would be very grateful if someone can direct me where to start looking for the faulty. I have a basic electronics knowledge. I don't know how the circuit works, if someone can explain to me that will be great. Look forward to hear something from someone.Regards

author: strawberry
author_rank: Super Contributor
timestamp: May 24, 2022, 06:16:52 pm
content: single beam scopeuses choper to switch/multiplex between channels(when turned on)

author: mluhar
author_rank: Newbie
timestamp: May 26, 2022, 09:50:32 am
content: Thank you for your reply sir. You couldn't explain to me how that circuit works? Your help will be appreciated. Thanks.
micro concepts BoardWalker 103 - Page 1
Forum section: electronics / testgear

author: BobBeBob
author_rank: Regular Contributor
timestamp: May 26, 2022, 04:59:50 am
content: Hi all, I just got a great deal (or what I think is a great deal), on a Micro Concept Boardwalker 103, it is an IC, Ram, Rom tester. it seem to have a few more option related to IC testing.has a library of chips. matched one the its chips in my stock and tested it and it works.I am looking for it manual. any one out there has a manual for this unit please let me know. I can purchase.thanks muchBob

author: dorkshoei
author_rank: Frequent Contributor
timestamp: May 26, 2022, 05:17:54 am
content: Was it the one on eBay in Virginia? I have one of the Micro Sciences ICT-101s which I believe was a precursor. Can't help on the manual. Sorry.
Fluke ScopeMeter 105B how is it worth - Page 1
Forum section: electronics / testgear

author: coromonadalix
author_rank: Super Contributor
timestamp: May 27, 2022, 10:04:58 pm
content: I have a functionning fluke Scopemeter 105B, gray rubber holder protectorOriginal suitcase, all the adapters / probes .... and the famous rs232 Ir interfaceIt has the Ni-Cad battery pack still holding a charge, not sure how long ....Universal AC plugs adapters ...In pretty good shape, no problems on screen and keyboardI dont know how the get th FW revision, any toughts ??May want to sell it

author: AVGresponding
author_rank: Super Contributor
timestamp: May 28, 2022, 07:59:03 am
content: I paid £300 a couple of years back for my 99B series 2, in similar order minus the RS232. These things continue to make more money than they are worth (compared to more modern gear) so I wouldn't be at all surprised if you made US$500 or more.
TEK Logic Analyzer D-Max P69xx CLGA INTERFACE CLIP - Page 1
Forum section: electronics / testgear

author: dmderev
author_rank: Contributor
timestamp: May 19, 2022, 09:58:11 pm
content: Hello, Does anyone know where to source the cLGA clip (this is a small plastic part with spring contacts which attaches the edge pads on P69xx or other "D-Max" Tek probes to PCB Pads)? Or maybe any suggestion how to build/3Dprint or otherwise obtain these little parts without which the probes are not usable?One potential solution is to use anisotropic silicon rubber contacting material which sometime was used in the BGA test sockets - but it looks that it is not obtainable either...https://www.shinpoly.co.jp/en/product/product/electric/gb-e.html= this may be a candidate - but where to get few strips?Maybe some ideas how to make them from silicon elastomer and thin copper wires?Or maybe there are any tiny spring contacts anywhere (from LGA sockets) which can be used?It is a pity that Tektronix went out of LA business, so the parts are not available anymore...Any advice welcome!

author: RomDump
author_rank: Regular Contributor
timestamp: May 21, 2022, 06:40:38 pm
content: There was a similar thing done for the P6860 probes.Take a look at this post:Elastomer strips for Tektronix LA probes.Maybe PMCBrandin.

author: dmderev
author_rank: Contributor
timestamp: May 25, 2022, 07:07:01 am
content: Thanks for reply! Unfortunately Chris is not online; besides, these probes have a bit different construction.
Need advice with a MSO - Page 1
Forum section: electronics / testgear

author: pisoiu
author_rank: Regular Contributor
timestamp: February 22, 2022, 05:06:37 pm
content: Hi all,I know there are plenty of topics about this but my questions are somehow related to this precise moment in time, so I need a fresh opinion.For my work I need a new scope, since the old one (100mhz 2 ch hantek) is not suitable for some of my problems.Considering all technical parameters I need, MSO7000 series from Rigol would do the job, 4 analog+16 digital channels.At this moment they have a promotion with 10% price drop and free options bundle, consisting of basically all serial decoders (can, i2c, spi, etc) and waveform generator.I would need 500mhz bw, but unfortunately my pocket is tight right now and I must find...ehem..alternate solutions.All their scopes from this series (100, 250, 350 and 500mhz bw) have the same hardware as far as I can see in their specs.Question one is if these models can be hacked to 500mhz. I found other topics which says they can, but they are a bit old and maybe they removed the easy access to scope files.Another question is if there are any other offers in the market with better value than this one. I know about siglent but those do not offer any included serial decoders (which costs a lot), and of course, Keysight, R&S and others like those are way out of my possibilities.Thanks.

author: tautech
author_rank: Super Contributor
timestamp: February 22, 2022, 06:45:52 pm
content: Quote from: pisoiu on February 22, 2022, 05:06:37 pmAll Siglent DSO's that offer decoding have I2C,SPI,UART, CAN and LIN decoding and trigger suites included for free.

author: pisoiu
author_rank: Regular Contributor
timestamp: February 22, 2022, 07:22:04 pm
content: You're right, my mistake. Only some requires license (CAN FD, Flexray) and LA is also optional, for SDS5000x series. For SDS2000X plus the decoders requires licenses. Am I wrong?

author: tautech
author_rank: Super Contributor
timestamp: February 22, 2022, 07:38:58 pm
content: Quote from: pisoiu on February 22, 2022, 07:22:04 pmSDS2000X Plus has I2C,SPI,UART, CAN and LIN decoding free as does all Siglent DSO's that offer decodes.Further info:SDS5000X has individual vertical controls.SDS2000X Plus has a shared vertical control.Both 10" touch display.They both use the same SPL2016 MSO probe set however LA license for MSO is more expensive for SDS5000X. Don't ask me why, I have asked Siglent to align the pricing better.But, you can have SDS2104X Plus for $1400 basic unit however SDS5304X is $3569 basic unit.Either can be enhanced to 500 MHz however SDS2000X Plus only permits the use of 2 channels at fast timebase settings and defaults to 350 MHz when 3 or more channels are active.

author: ozkarah
author_rank: Regular Contributor
timestamp: May 23, 2022, 08:01:16 pm
content: Quote from: tautech on February 22, 2022, 07:38:58 pmSorry for asking. What is individual vertical control?

author: Martin72
author_rank: Super Contributor
timestamp: May 23, 2022, 08:09:52 pm
content: Every channel got it´s dedicated vertical position knob, instead one for all.
SDS1104xe - How to filter the screen to the cursor range or trigger period? - Page 1
Forum section: electronics / testgear

author: richieHH
author_rank: Newbie
timestamp: May 24, 2022, 08:20:56 pm
content: How do I limit the display to one period of the trigger channel or even just to the timeline selected by the cursors? (I'm using the sync output of a UTG962e to channel 2 and selecting that as the trigger, while feeding a frequency sweep (line) into channel 1). It seems like something I would want to do. Can I?
SVA1075X Modulation Analyzer SCPI commands - Page 1
Forum section: electronics / testgear

author: domtom555
author_rank: Newbie
timestamp: May 24, 2022, 08:36:30 am
content: Hello everyone!I have theSVA1075XSpectrum Analyzer and have successfully acquired raw data from theSAusing theirProgramming Guideas reference.However, I cannot find an appropriate command for acquiring data from the Modulation Analyzer.For theSA, I have used ":TRACe:DATA? 1" but the same command on theMAyields no results.I have also tried variations of this command: ":TRACe:DATA?", ":TRACe:DATA:NAME?" and ":TRACe:DATA:NAME RTIMe?" but again, no results.Does anyone have any insight or experience with this, is there any way to get any useful data from the Modulation Analyzer?
Can you replace the holster on a Fluke 175? - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 21, 2022, 11:10:39 am
content: I have a Fluke 175 which is still working fine but the integrated holster is torn and peeled off. Do you think the I can replace the holster without spending too much money? Well I just want to make it nice if I can without spending too much. I have more DMM than I need.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 21, 2022, 11:44:24 am
content: I couldn't see a way to do this on my old 179. You could try to buy and entire back enclosure...eBay auction: #144556844265

author: Fungus
author_rank: Super Contributor
timestamp: May 23, 2022, 05:49:13 am
content: Nah, the molded-on rubber can't be replaced separately. You have a buy a whole new case.

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 23, 2022, 03:30:33 pm
content: OK Thanks. The set of front and back cover cost over $100 on Ebay. So I decided to strip all the rubber away and use the meter naked.

author: robert.rozee
author_rank: Frequent Contributor
timestamp: May 23, 2022, 04:27:59 pm
content: how cleanly did the rubber come away? i'd me interested in seeing a photo or two of what the meter looks like nowcheers,rob :-)

author: BeBuLamar
author_rank: Super Contributor
timestamp: May 23, 2022, 08:31:20 pm
content: Not very clean. I hope I will be able to remove it all later.