hybridfree/eevblog-posts huggingface dataset:
Bench DMMs and GPSDOs - Page 1
Forum section: electronics / testgear

author: Electro Fan
author_rank: Super Contributor
timestamp: September 23, 2020, 05:27:15 am
content: Probably a dumb question, but why do bench DMMs not have a 10 MHz reference input and output? It seems like if the voltage reference in a DMM is go good that it doesn’t need a ref input then it would be useful to have a ref output, and vice versa. Plus it would seem that it could be useful to have all the gear in a lab sync’d. Might not be economical for entry DMMs but for some in the midrange and beyond it might have some utility. I’m guessing the answer might have something to do with short term clock accuracy vs long term stability but it seems like we are headed toward having both at increasingly affordable costs. After seeing how a GPSDO output can drive scopes, counters, generators, and spectrum analyzers, why not also bench DMMs?

author: HKJ
author_rank: Super Contributor
timestamp: September 23, 2020, 05:54:58 am
content: Probably because they do not really have any use for it. A frequency reference input would not improve voltage, current or resistance readings.A frequency counter in a DMM would, of course, improve with it, but that function is a very minor function in a DMM.

author: tkamiya
author_rank: Super Contributor
timestamp: September 23, 2020, 06:13:28 am
content: There is really not good economical ways to use frequency reference as a voltage reference and vise versa. I do prefer separate instruments for measurement of separate properties.Also, GPSDO is NOT that precise short term. Good ovenized crystal oscillator will be orders of magnitudes better for up to 100 seconds or so. In order for GPSDO to reach 10^-12 or -13 level, it'll have to be averaged over 24 hours or longer, and also have to have a very good OCXO in it. So even IF you could use GPSDO as voltage reference (which you cannot), you'll end up measuring for long time to make use of that accuracy.

author: jpb
author_rank: Super Contributor
timestamp: September 23, 2020, 07:35:11 am
content: The only reason I can think of is for logging, but timing for that doesn't need to be that accurate as measurements themselves are not that speedy and results can always be time-stamped externally by the PC or whatever else is controlling them.Some (perhaps many) DMMs have a trigger input for measurements (at least I think they do) so timing aspects can be kept external.I have just acquired a Gossen Metrahit ISO DMM (hand held rather than bench) which has a real time clock for logging. Looking at the manual I realise this has a down-side in that the thing draws power and drains batteries even when off.
Siglent SDS2350X Plus trigger issue with edge rate - Page 1
Forum section: electronics / testgear

author: refd
author_rank: Newbie
timestamp: September 22, 2020, 09:07:55 pm
content: Just got the SDS2350X Plus and put my SDG2042 into a high impedance channel on the scope. Set it to 1s rep rate pulse at 10% duty cycle. Edge rate was 8.5nS default. Amplitude set to 8V high and 0V low. Triggered at 4V. Set falling edge but it will only trigger at the leading edge. If I dial up the slope to 18nS with falling edge triggering set it will start to jump from leading to falling edge trigger. Anything past 18nS rise/fall and it triggers where it should. Rising or Falling.What gives? Can't be any simpler than that.Cj

author: mawyatt
author_rank: Super Contributor
timestamp: September 22, 2020, 11:01:52 pm
content: Try using normal trigger mode, auto is probably issuing additional triggers on such a slow waveform.Best,

author: mawyatt
author_rank: Super Contributor
timestamp: September 22, 2020, 11:56:14 pm
content: Just tried this with the SDS2102X Plus and in Auto trigger mode it's bouncing all over the screen. Change to Normal trigger mode and it's locked on the edge, whichever you've selected rising or falling.Best
Siglent electronic load question - Page 1
Forum section: electronics / testgear

author: Spike
author_rank: Regular Contributor
timestamp: September 20, 2020, 11:13:53 pm
content: Hey all,I'm considering the purchase of one of the Siglent electronic loads, probably the SDL1020X or X-E, and I have a question about something I saw in thedatasheet.At the bottom of the Program Function section, there is a sentence that reads, "Auto-test function is especially useful in the designing battery charging circuitry." Even though I'm not considering it specifically for this purpose, I do happen to be building a charging circuit into a current project and this made me curious.My question is, what is the basis for this statement. I was under the impression that for this sort of testing required either additional (voltage source) or specialized (battery emulator-ish-y thing) equipment. Has anyone used this load for testing charging circuits or know specifically what features of the Siglent load make it useful for this? Is there a configuration utilizing additional equipment that is not specifically stated here? I can find no other reference to this in the other documentation for this load.Thanks in advance

author: tautech
author_rank: Super Contributor
timestamp: September 21, 2020, 12:08:03 am
content: I think your question is answered in this app note:https://siglentna.com/application-note/power-supply-design-load-step/Where a SDL is just one part of a PSU test system and refers to programming of the SDL to apply the necessary load parameters to a PSU to ensure it behaves as expected under its design brief.

author: Spike
author_rank: Regular Contributor
timestamp: September 21, 2020, 12:47:46 am
content: I saw that but didn't think it applied because of the changing battery voltage during the charging process. I'll look again but is that accounted for in this application note?The note doesn't mention the Program mode specifically and I was wondering why that specific comment was made in regard to that mode. They don't elaborate on what about the program mode lends itself to charging circuit testing. Oh, well, just wondering.

author: tautech
author_rank: Super Contributor
timestamp: September 21, 2020, 01:50:34 am
content: Quote from: Spike on September 21, 2020, 12:47:46 amDepends entirely on the battery chemistries involved.7 stage chargers are common these days that also accommodate support for 2 or more battery chemistries.Each step between charging stages needs to proved as reliable/stable so devices like SDL need provide these capabilities.A smart 12V charger I've just repaired had 7 stages and supported LA, CaLA and SLA.
Need vertical position fiber glass shaft for 465 - Page 1
Forum section: electronics / testgear

author: n4idaham
author_rank: Newbie
timestamp: September 18, 2020, 12:06:10 am
content: Does anyone know where I can get a replacement vertical position fiber glass shaft for a Tek 465?Al

author: med6753
author_rank: Super Contributor
timestamp: September 18, 2020, 12:51:42 am
content: I'm pretty sure I have one. I'll pull out my 465 carcass tomorrow AM and I'll check.

author: med6753
author_rank: Super Contributor
timestamp: September 18, 2020, 06:31:21 pm
content: This rod here should work just fine and will be a little longer than you require. It can be easily trimmed to length with a Dremel.It's yours for the cost of shipping only. Contact me via PM if interested.

author: TimFox
author_rank: Super Contributor
timestamp: September 18, 2020, 07:06:10 pm
content: If anyone else has a similar problem, McMaster-Carr (the source for all good things) has FR-4 rods:https://www.mcmaster.com/plastics/shape~rod-and-disc/garolite/
HT206D: Best new 40$ AC/DC Clamp meter technical evaluation - Page 1
Forum section: electronics / testgear

author: duraluminium
author_rank: Newbie
timestamp: September 20, 2020, 11:35:01 am
content: I have recently bought a HT206D offAmazonfor 33.99EUR. It claims AC/DC clamp current measurement, Low Z mode (AC/DC), capacitance, diode test (3 V), frequency, duty cycle, temperature, LPF in AC test mode, NCV. Included are probes and thermocouple. The device seems very good, measurements correspond to those measured on a Peaktech 2025, so for non precise work seems great.I have taken a few pictures, and am curious for some input from our engineering folks as to safety, input protection and electrical integrity. The device claims 600V Cat III.One question I have, in the manual it states that Resistance/Diode/Capacitance/Continuity and frequency/duty cycle mode are not to be used with voltages over 10V. I 'accidentally' tried the frequency/duty mode on 230V grid voltage, and it worked fine, showing 50Hz/50%. (the AC/DC voltage mode also has a frequency measurement by pressing the function button.) Do I risk damage by using resistance/././. and frequency/duty cycle mode with higher voltages? Is the "not above 10V" just a generic cop out for some kind of safety requirement? Perhaps someone can comment on all this looking at the circuit board pictures.Do I risk damaging the meter by quickly switching through (possibly non compatible) modes with the probes still connected to grid voltage (I understand this is bad practice)?The main chips are:DM1106EN XY200301 (microprocessor)FT24C02A 9w5CDE (EEPROM)2x GS8552 TE158A (op amp)crystal X1 marked 4.000Find attached some pictures I took of the board. Look forward to some analysis and commentary. I can say as a first impression, I am quite happy, certainly the bang-for-buck is very good.Imgur link to full res images
RE: Maximun Voltage ratings of Micsig DP10013 Differential probe - Page 1
Forum section: electronics / testgear

author: Valver
author_rank: Contributor
timestamp: September 19, 2020, 01:00:33 am
content: Greetings all! I am using a Micsig DP10013 probe to measure the signal voltage across the primary of the audio output transformer in a push-pull tube amplifier. The probe's maximum ratings are 1300v (DC+ACp-p) in differential mode. Common mode maximum is either 1000V(DC+ACpeak) CATIII according to the Micsig web site or 1300V (DC+ACp-p) according to the manual. Maximum input signal to earth voltage is 1000V CATII.For my application the common mode voltage is 540v DC, which is the supply voltage on the plates of the output tubes. The differntial ac signal voltage is 1200V p-p. This would result in a maximum peak voltage of 1140V from each probe tip to earth. I would like to know whether the max signal to earth rating for the DP10013 is 1000V RMS, 1000V DC+ACp-p or 1300V (DC+ACp-p).Thanks for your input.
HP 8924C front panel buttons - Page 1
Forum section: electronics / testgear

author: xxx2fan
author_rank: Contributor
timestamp: August 23, 2020, 01:07:02 am
content: Hi I have a HP9824C service monitor and it started today the front panel buttons none work or the cursor push button. It passes the startup with no errors. I've went through the service manual but see nothing that jumpes out at me. If somone has a good starting place I sure could use some help.Thanks in advance for any help, ie where is best place to start.Thanks again

author: xxx2fan
author_rank: Contributor
timestamp: August 23, 2020, 01:07:48 am
content: woops thats an HP 8924C typo sorry

author: MosherIV
author_rank: Super Contributor
timestamp: August 23, 2020, 10:10:33 am
content: Is it in gpib external mode?Often putting instruments into gpib control will disable the instrument controls.

author: xxx2fan
author_rank: Contributor
timestamp: August 23, 2020, 01:18:23 pm
content: Thanks Mosher IV could you please please telll me how to get it out that mode.Thanks for reply Its set up like a 8920 when I got it comes up after startup in TXxxx2fan

author: xxx2fan
author_rank: Contributor
timestamp: August 29, 2020, 03:17:55 pm
content: Far as i can tell it's in console mode. checked the power supply voltages all are good per specs. I check the 10Mhz its right on. reseated the i/o controler card checked the cables. Nothing changed. still to keys work and the cursor changes fields but will not sellect. The for leds on the I/O card D1-D4 come on when power up as they should then go out after beep. Passes all test.I sure need some help stumped here.

author: xxx2fan
author_rank: Contributor
timestamp: September 20, 2020, 05:24:44 pm
content: Update: Took the unit to Rick at Amtronix Instruments, 62 miles from me. He found the keyboard bad, also the RX and SA not working Receiver synthesizer module . Repaired the unit installing new keyboard. Fixed all issues with Service monitor, also did a CAL on the unit traceable to NIST with full performance evaluatiom data. due again in 2022.Very happy with Ricks service.Thanks for everyones help with my issues.
HP DYNAMIC SIGNAL ANALYZERS (HP 35665A, HP 35670A, etc.) - Page 1
Forum section: electronics / testgear

author: simone.mannori
author_rank: Newbie
timestamp: April 12, 2018, 06:56:53 am
content: Hi,my name is Simon and I'm obsessed by (HP) dynamic signal analyzers.Anyone interesed in the subject? Repairing, software options activation, hack, schematic diagrams, etc. ?You can contact me using this forum or personally (simone dot mannori at gmail dot com).Happy hacking :-)Simon

author: tecman
author_rank: Frequent Contributor
timestamp: April 12, 2018, 05:23:15 pm
content: I used a 3563a at work for a number of years. In my home lab I have had a 3582a and a 3561a. Today I own an Advantest R9211C and an HP 3560a. The HPs are great, but tend to be big and bulky and much higher cost than some others.paul

author: precaud
author_rank: Frequent Contributor
timestamp: April 13, 2018, 03:26:18 am
content: I have a 3567A system and really like the flexibility.

author: Stray Electron
author_rank: Super Contributor
timestamp: April 13, 2018, 02:08:41 pm
content: I picked up a HP 35665A a few weeks ago and it seems to work and has a LOT of options in it including HP Instrument Basic but I haven't time to learn it yet.I need to find some real manuals for it. I hate trying to run back and forth between TE and a computer to look at PDFs.

author: Tomorokoshi
author_rank: Super Contributor
timestamp: April 13, 2018, 02:37:40 pm
content: There are a few topics here and there on those machines.It's possible to update the 35665A with any remaining software options:http://www.glkinst.com/test-equipment/

author: Stray Electron
author_rank: Super Contributor
timestamp: April 13, 2018, 08:37:46 pm
content: That's on my To Do list. I was lucky in that mine came with all or nearly all of the hardware options such as the full memory and the I BASIC controller so if I enabled all of the SW options it would be LOADED. But these are complex enough that it looks like it's going to be a chore to learn how to use all of the features.

author: jsantoro
author_rank: Regular Contributor
timestamp: April 13, 2018, 09:09:24 pm
content: I have a 3561A. Don't use it much at all anymore since Software and PC's. I do mostly audio work. It is a site to behold, construction wise. They the the tip top talent back then. I really should sell it and let someone else playJim

author: smps
author_rank: Contributor
timestamp: September 18, 2020, 07:40:44 am
content: I bought a 35670a with bad power supply.any one has the schematic for the power supply?thanks
Micsig STO1000 smart oscilloscope operation video - Page 1
Forum section: electronics / testgear

author: Micsig_support
author_rank: Regular Contributor
timestamp: April 15, 2020, 02:27:11 am
content: Dear All,We are making more videos for Micsig oscilloscope STO1000 right now. From those videos we will tell you how to use full touch +knobs with android system smart oscilloscope.Here is the ink. and if you have any question, pls ask me here. thanks.https://www.youtube.com/playlist?list=PL4DPesFcepHs7DhG1IhxYm33MQGeeFHnw

author: matmatmat
author_rank: Newbie
timestamp: April 15, 2020, 10:12:03 pm
content: Can I run a custom app on STO1000 oscilloscope .Can this app access data from oscilloscope by SCPI or another way?

author: Micsig_support
author_rank: Regular Contributor
timestamp: April 16, 2020, 11:03:12 am
content: Quote from: matmatmat on April 15, 2020, 10:12:03 pmCurrently. only APP was approved by Micsig can be installed on oscilloscope.they have SCPI commond. pls email to sales@micsig.com or asia@micsig.com to ask them to send you file.

author: Micsig_support
author_rank: Regular Contributor
timestamp: September 18, 2020, 10:28:18 am
content: one new video for Micsig STO1104C

author: Fungus
author_rank: Super Contributor
timestamp: September 18, 2020, 11:37:27 am
content: Quote from: Micsig_support on September 18, 2020, 10:28:18 amThanks for that!It's really good to see one in action, it really has to be the best value 'scope in that price range - forget the Siglents, etc.The video also lets me know if it's worth going for the version with knobs/buttons or not. It seems like it's easy enough to use without them.PS: I didn't realize they were also fully functional Android tablets. The ability to mirror it to an Android 'phone is very cool, too.
Stumbled upon this scope.... Multicomp pro MP720024  - Page 1
Forum section: electronics / testgear

author: xchg.ca
author_rank: Contributor
timestamp: September 18, 2020, 12:41:05 am
content: Stumbled upon this scope.... Multicomp pro MP720024!https://canada.newark.com/multicomp-pro/mp720024-us/digital-storage-oscilloscope-100mhz/dp/10AH2403?st=scopeAny idea what the heck it is ? First time I see such brand as well as wondering if this is something re-badged? I see no mention of this thing anywhere in internet !Specs seems to be okIt has even 12bit verticalAny thoughts?

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: September 18, 2020, 01:40:17 am
content: House Brand/Rebadged. Knobs look like an OWON, Maybe an XDS2102A?
Prema ARB1000 Arbitrary Waveform Generator - Page 1
Forum section: electronics / testgear

author: H713
author_rank: Regular Contributor
timestamp: September 17, 2020, 06:02:33 pm
content: I just purchased a Prema ARB1000 Arbitrary waveform generator at an auction for about $30. It was on a machinery auction site, and nobody even knew what it was. I still need to pick it up, however, I was wondering if anyone here knows anything about these. I have been completely unable to find a user manual or even so much as any information about its existence. I have every reason to believe it works, but it would still be nice to have a service manual if anyone happens to have that as well.Thanks,H713

author: maginnovision
author_rank: Super Contributor
timestamp: September 17, 2020, 06:15:34 pm
content: https://ohh.de/arb1000.HTMYou might try emailing Prema directly for user and service manuals. No guarantee they have them but it's worth a shot. They're very friendly.
Agilent/Keysight DSO9000 hacks ? - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: September 17, 2020, 03:00:02 pm
content: Hello,anyone aware of any hacks for the Agilent DSO9000 series ?? The search option here doesn't help much...I've come across some info, but seems more like sparse individual initiatives, with close to zero technical explanation, 'would like to know if and what has already been hacked on those models...
TDS694C - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: September 15, 2020, 02:57:43 pm
content: I have this unit with a SPC fail, I got the channels 3 and 4 behaving well and the channel 1 and 2 are showing something reasonable at 200mV and up ( upper side of the relays)Few questions:Is the ADC the same for both range 10mV to100mV and 200mV to 1V or is it on different pins ?Anyone having a drawing / diagram for that unit ?I suspect the ref signals for the SPC or relays to be bad, if I tweak cal, I can see reasonable traces...

author: tchiwam
author_rank: Regular Contributor
timestamp: September 15, 2020, 03:12:31 pm
content: Don't you love it when they say As Is because we can't test it ...Then you open it and someone really tried to frill it...

author: tchiwam
author_rank: Regular Contributor
timestamp: September 17, 2020, 01:08:16 pm
content: Well, I have at least 2 good trigger chips and maybe a 3rd one. Can't test the channel 1 yet...

author: rvalente
author_rank: Frequent Contributor
timestamp: September 17, 2020, 01:21:33 pm
content: Did you try to check the service manual?https://www.tek.com/oscilloscope/tds794d-manual/tds500d-tds600c-tds700d-tds714l-service-manual

author: tchiwam
author_rank: Regular Contributor
timestamp: September 17, 2020, 02:38:53 pm
content: Yes, I need something closer to a schematic of the A10 board.I am suspecting that one of the relay is dead, channel 1, then I think the reference for calibration is out of specs, it is warming up the internal termination.
Use 2 Bluetooth dongles simultaneously with Windows 10 for data acquisition?  - Page 1
Forum section: electronics / testgear

author: Peter Gamma
author_rank: Frequent Contributor
timestamp: September 17, 2020, 11:47:50 am
content: When I use two Muse 1 headbands with Bluetooth simultaneously and connect them via Bluetooth to a PC trough LSL. Can I solve the Bluetooth bandwidth problem by adding more Bluetooth dongles to the PC? Can I increase the bandwidth in this way to connect as many Muse headbands as I want simultaneously to a PC?Unfortunately not:https://forums.pureinfotech.com/t/can-i-use-more-than-one-bluetooth-adapter-on-the-same-computer/445this is a pity. How can more Bluetooth bandwith be obtained?Is there no workaround to have more than one Bluetooth dongle connected to a PC and bring them to work?There is a module on Aliexpress which can connect an TGAM EEG module over Bluetooth to Android or to a PC:https://de.aliexpress.com/item/32606318948.html?spm=a2g0o.productlist.0.0.f9b614c9tGnEVN&s=p&ad_pvid=2020091704483611901111904167900000185215_1&algo_pvid=297f759d-6c2c-4efa-9a02-f8f6b6602b3d&algo_expid=297f759d-6c2c-4efa-9a02-f8f6b6602b3d-0&btsid=0ab6d59516003433164674831ed84d&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_The manufacturer can deliver SDKs for Android and connect the device over BlueSoleil to a PC. The description says."with this kit you can make a wear BCI device yourself"You can build your own Muse headband with this kit with as many EEG channels as you want. This might be interesting for EEG software developers. But due to bandwidth limitation only four about 4 channels.I suppose if someone develops special software for it, then it would work.Windows allows only one sound card. But it is possible to add multiple usb sound cards to a PC. But only one works.A solution for adding as many EEG sensors as you want is by connecting them through Scott Hardens sound card device:https://swharden.com/blog/2019-03-15-sound-card-ecg-with-ad8232/and replace the ECG sensor by an EEG sensor. Scott Harden, has developed special software for his device which can handle with multiple sound cards.The Aliexpress seller of the Blueotooth EEG sensor answered the questions about multiple Bluetooth dongles:"Actually it can be available, just need to modify the pairing code of each donge"Or eventually Bluetooth dongles from different manufacturers.Answer from Aliexpress seller: "Maybe it works, I'm not sure".But does it make sense at all? EEG devices with more channels usually use wifi. Would there be a reduction in energy consumption with multiple Bluetooth sticks in parallel compared to wifi?
Read out data from the Adinstruments Powerlab 8sp channel recorder usb port? - Page 1
Forum section: electronics / testgear

author: Peter Gamma
author_rank: Frequent Contributor
timestamp: May 19, 2020, 01:42:48 am
content: I bought an Adinstruments Powerlab /410 channel recorder. Unfortunately, there was no software included. The Adinstruments support offert me a replacement Chart software which is incuded to this recorder.The Powerlab /410 needs a SCSI card, and the Adinstruments chart sofware is a post processing software. There is no real time analysis possible.Later on, I bought an ADInstruments PowerLab 8SP recorder with an usb port. There was also no software incuded from the seller. The Adinstruments support told me, I could use the same Chart software for my second Adinstruments channel recorder.The Adinstruments Labchart software offered by Adinstruments has real time analysis, but is too expensive for my purpose.Is there an easy way to read out sensor data from an ADInstruments PowerLab 8SP usb port, to use it with 3 th party software?

author: Peter Gamma
author_rank: Frequent Contributor
timestamp: September 17, 2020, 11:15:22 am
content: I asked myself, can Scott Hardens Sound Card ECG device:https://www.eevblog.com/forum/testgear/how-can-scott-hardens-sound-card-ecg-circuit-be-printed-on-a-circuit-board/msg3232178/#msg3232178be used instead of an Adinstruments channel recorder? Both have 16 bit analog to digital conversion. There are lots of differences, but are the basics not identical?I recently bought an Adinstruments 8SP for 200 USD on ebay. But for ECG it needs an additional Bioamp, which costs additional 150 USD on ebay. Is the Bioamp equivalent to the ECG breakout board of Scotts circuit, and the channel recorder equivalent to the rest of Scotts circuit?I asked the Adinstruments support how many EEG channels the Adinstruments 8SP supports, and whether they are validated data available for EEG recordings? No, no validated data available.The 8 SP works for 8 EEG channels, and I would need to buy another Biamp, the Octal, which looks very expensive, I did not ask for the price. Furthermore I would need to upgrade from Labchart 7 (which I don t have, I have the Adinstruments Chart software) to Labchat 8, since the newer Adinstruments amplifier need Labchart 8.Therefore, EEG validation with an old Adinstruments 8SP device seems not to be a project which make sense. Unfortunately, there are very little validation data available for low-cost EEG devices. One of the rare exeptions is Alexandre Brachants EEG ranking:https://alexandre.barachant.org/blog/2017/03/02/Hands-on-OpenBCI-Ganglion.htmlAny ideas how to obtain an affordable EEG reference device which can be used to validate DIY EEG devices?
SDS7102V noise solved - Page 1
Forum section: electronics / testgear

author: Audiodave
author_rank: Newbie
timestamp: September 16, 2020, 10:41:07 pm
content: Hi, My SDS7102V is fitted with the later power pcb, I had 2 types of noise, spikes from the power supply and signal noise, the 2 should not be confused, after reading many posts here I decided to take a look, as the newer power pcb has all the extra smd ceramic caps and other mods I decided to look elsewhere, I did the D127 mod, this made a big improvement, next I used 25mm copper emi tape across the foil/ferrite to the display, insulated with pvc tape, the copper foil bonds extremely well to the chassis, I did the same across the adapter board over L2 etc, ALL the spikes have gone on both channels, the noise floor is as pictured scope is at 2mv/div pics are grounded and probe in the air, if sufficient interest I will open it back up and take pics.

author: Audiodave
author_rank: Newbie
timestamp: September 16, 2020, 10:45:55 pm
content: Tip grounded.

author: Audiodave
author_rank: Newbie
timestamp: September 16, 2020, 10:48:20 pm
content: The D127 mod, thanks to who devised this!

author: masterx81
author_rank: Frequent Contributor
timestamp: September 17, 2020, 06:18:23 am
content: Hi! Interesting, but i've not fully understood how have you placed the emi adhesive tape.The noise seem really good fpr this scope.
Is it worth exchanging Multimeter UNIT U61E for U532? - Page 1
Forum section: electronics / testgear

author: tecnicaemail
author_rank: Newbie
timestamp: September 17, 2020, 03:38:52 pm
content: Dear friend wanted opinion from you, is it worth the exchange?I own the UNIT UT61E and the exchange for a UT532 appeared.From what I saw on the Site at UNIT the U532 was discontinued, I didn't find anything about him, visibly at hand he is a Multimeter, but I'm not an expert and I wanted the opinion of friends.Thanks in advance.

author: 2N3055
author_rank: Super Contributor
timestamp: September 17, 2020, 04:45:16 pm
content: https://eleshop.eu/uni-t-ut532-insulation-resistance-tester.htmlsome info

author: tecnicaemail
author_rank: Newbie
timestamp: September 17, 2020, 04:59:51 pm
content: Quote from: 2N3055 on September 17, 2020, 04:45:16 pmIn your opinion which should I stay?

author: 2N3055
author_rank: Super Contributor
timestamp: September 17, 2020, 05:22:04 pm
content: I don't know what you are going to use it for.UT532 has up to 1000V insulation resistance measurement. That is good for checking insulation in transformers, motors etc.UT61E is more of a electronics meter with some other measurements. And PC link.Compare functions and decide what will be most useful to you.

author: tecnicaemail
author_rank: Newbie
timestamp: September 17, 2020, 06:18:49 pm
content: Quote from: 2N3055 on September 17, 2020, 05:22:04 pmI will use it for electronics, laptop repairs, etc. But I want a good instrument and if the UT532 is better then I take it, I’m in doubt, I really liked the 532 because it has internal light that we can turn on and off whenever you want, the bug is huge and robust and very good, the only thing I didn’t like about the 532 and it doesn’t have amperage measurement and if my memory serves me correctly, its capacitance is less than that of the 61e?There I am in this doubt because the multimeter will be used for these purposes and voltage measurements to standard residences.

author: 2N3055
author_rank: Super Contributor
timestamp: September 17, 2020, 06:37:51 pm
content: Quote from: tecnicaemail on September 17, 2020, 06:18:49 pmKeep UT61 then. Quality wise, they are both same UNI-T quality, not crap but not top notch either. They do the job, but not very robust.

author: Fungus
author_rank: Super Contributor
timestamp: September 18, 2020, 07:14:29 am
content: No.
Pendulum CNT-90 Service Manual? - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: July 11, 2020, 05:38:45 pm
content: Does anyone have this or know of its whereabouts? It may also lurk under the name of the Fluke PM6690 or the Tektronix FCA3000 which were badge engineered versions.David

author: coromonadalix
author_rank: Super Contributor
timestamp: July 11, 2020, 06:15:14 pm
content: you have some infos in the fluke section, not sure for any SV manualshttp://www.ko4bb.com/getsimple/index.php?id=manuals&dir=Fluke

author: YetAnotherTechie
author_rank: Regular Contributor
timestamp: July 13, 2020, 02:07:05 pm
content: this units also exists under the fluke and the philips brand-names, one of them has a complete service manual, i found 2 revisions, and there are two hardware versions(each manual has both so no prob), you can find some info using the wayback machine too. i can't help you now, i can't find my files...

author: coromonadalix
author_rank: Super Contributor
timestamp: July 13, 2020, 02:27:30 pm
content: https://manualzz.com/doc/6289808/pm6690---flukea 9meg pdf can be downloadedHope it helpsUploaded to ko4bb, may take a while to appear ??

author: coromonadalix
author_rank: Super Contributor
timestamp: August 07, 2020, 08:21:58 am
content: Now at ko4bbsectionPhilips/PM6690_Frequency_Counter

author: Teti
author_rank: Regular Contributor
timestamp: September 09, 2020, 07:07:15 pm
content: Quote from: coromonadalix on July 13, 2020, 02:27:30 pmThank you

author: Teti
author_rank: Regular Contributor
timestamp: September 09, 2020, 07:21:25 pm
content: Do you by any chance know what is a calibration password?

author: DonRon
author_rank: Regular Contributor
timestamp: September 09, 2020, 08:21:48 pm
content: Hi Teti,found the service-manual for Fluke PM6690:https://manualzz.com/doc/6289808/pm6690---flukeHave a look at page 7-3 The Calibration Submenu ..."The Calibration SubmenuWhen used for the first time, this submenu can be activatedfrom the USER OPT menu after first entering the fixed pass-word 62951413. All calibrations that can be performed manu-ally are controlled from here. "So maybe 62951413 might work ..Cheers,Ronald

author: noreply
author_rank: Frequent Contributor
timestamp: September 10, 2020, 10:52:11 pm
content: Quote from: DonRon on September 09, 2020, 08:21:48 pmPlayed around with an original CNT-90 some time back - can definitely confirm this code is the default PW

author: Teti
author_rank: Regular Contributor
timestamp: September 16, 2020, 02:41:49 pm
content: Quote from: noreply on September 10, 2020, 10:52:11 pmThanks guys, cal password worked a treat!
Keithley 236/237/237 interlock connector - Page 1
Forum section: electronics / testgear

author: balage
author_rank: Regular Contributor
timestamp: September 16, 2020, 10:27:14 am
content: Hi Fellowes,Can anybody help me identify which connector fits the rear interlock connector of the good old Keithley SMUs?This is the 3-pin version, not the 4 that is used with the picoammeters. I just want to try buying one instead of changing them to LEMOs instantly.Thanks

author: coromonadalix
author_rank: Super Contributor
timestamp: September 16, 2020, 10:29:58 am
content: can you give me some diameters measurements, pins spacing etc ..... not sure but i think i have a tons of them at my job ... i have the chassis mount too, not pcb mount

author: coromonadalix
author_rank: Super Contributor
timestamp: September 16, 2020, 11:20:16 am
content: so farexternal od 8mmspace between pins 3mm ?Switchcraft tiny QG series, model TA3FXpdf attached

author: balage
author_rank: Regular Contributor
timestamp: September 16, 2020, 12:26:06 pm
content: Quote from: coromonadalix on September 16, 2020, 11:20:16 amHi,On the images it seems this is the one I need. And available at Mouser and Digikey.I will measure the dimensions to be sure, but it must be the one!Thanks! Recognizing a specific connector on an image - that needs experience.

author: justanothername
author_rank: Regular Contributor
timestamp: September 16, 2020, 01:17:56 pm
content: It is known as "mini XLR connector"
Agilent 1670G Logic Analyzer 64K standard acquisition memory to 2M hack - Page 1
Forum section: electronics / testgear

author: TK
author_rank: Super Contributor
timestamp: December 07, 2017, 12:49:32 am
content: I found out how to enable option 002 (2M acquisition memory per channel) on standard 64K Agilent 1670G. There are 2 extra SMD resistors on the logic PCB (bottom) of the 64K model and if you remove them, you can upgrade to option 002 (2M). I attached some images (out of focus... sorry).

author: kb5mu
author_rank: Newbie
timestamp: June 26, 2019, 11:56:48 pm
content: I'm very interested in an upgrade like this. I recently acquired a cherry 1670G with the Oscilloscope option, but I could really use larger acquisition memory.Do you mean to say that removing those capacitors enables existing memory, or do I also need to install memory expansion hardware? If the latter, can you tell me anything about what kind of hardware I need to add? So far I haven't seen any offers to sell the options separately.Thanks!-Paul KB5MU

author: TK
author_rank: Super Contributor
timestamp: June 27, 2019, 12:33:14 am
content: They are not capacitors, they are resistors. And yes, just removing them will enable the 2M option.

author: kb5mu
author_rank: Newbie
timestamp: June 27, 2019, 03:56:17 am
content: That's awesome, thanks so much!-Paul

author: Scopetechniques
author_rank: Contributor
timestamp: September 16, 2020, 01:17:30 am
content: Just found this awesome upgrade!Thank you!--Victor
Rigol DS2072 trigger out duty cycle - meaning? - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: September 12, 2020, 03:51:31 am
content: Got a second scope plugged into the trigger out BNC of the Rigol scope. It is a 3 volt pulse and the thing is, it’s duty cycle changes with both sweep speed and memory depth (which changes sweep repetition rate). I’m putting in a 1kHz 5% duty cycle pulse and if I see only a single pulse on the Rigol screen then the trigger out signal is at 1kHz. That’s okay. But if I wind up the scope timebase so that I can see only the leading edge of the 1kHz pulse from the function generator, the pulse from the trigger output gets narrower and narrower, roughly representing the percentage of displayed waveform vs the remainder of the cycle that is off screen. Is that what it is all about?

author: JDubU
author_rank: Frequent Contributor
timestamp: September 16, 2020, 12:55:25 am
content: Makes sense to me.A trigger-out pulse should appear for every trigger event. Each trigger event starts a new sweep. When the sweep ends, the scope must prepare itself for the next trigger. That would include resetting the current trigger-out pulse so that the next trigger event is guaranteed to be able to produce the rising edge of a new trigger-out pulse.
Motorola RLN4460 manual help - Page 1
Forum section: electronics / testgear

author: xxx2fan
author_rank: Contributor
timestamp: September 14, 2020, 08:29:23 pm
content: Does anyone have a manual that came with this unit. Possibly a pdf copy.Nothing on motorola site I can find. Little on Batlab site.Thanks

author: geggi1
author_rank: Frequent Contributor
timestamp: September 15, 2020, 11:27:09 am
content: As far as i rememeber the RLN4460 and the RTX4005 is more or less the same shematics. About 10 years ago i had the schematics for the testbox but im not working in the 2way shop any more.http://www.repeater-builder.com/motorola/test-sets/pdfs/rtx4005b-test-set.pdfAs far as i remember the schematics of the RLN4460 comes with the original motorola RIB manual.

author: xxx2fan
author_rank: Contributor
timestamp: September 15, 2020, 08:57:58 pm
content: Thanks for the info.
New Tek scope coming soon  - Page 1
Forum section: electronics / testgear

author: madmax96
author_rank: Contributor
timestamp: September 12, 2020, 08:49:50 am
content: Anyone has info about the new scope that Tek is going to introduce in the upcoming weeks? They just say more channels, less noise and more BW. It seems like a 6 series with 8 channel or something similar.

author: Sighound36
author_rank: Frequent Contributor
timestamp: September 12, 2020, 10:50:46 am
content: Hopefully a big improvement over the current 6 series would be benefical

author: madmax96
author_rank: Contributor
timestamp: September 14, 2020, 10:53:04 am
content: It could be an 8 channel at 4Ghz with 12 bit up to 12.5Gs/s. 4Ghz on 4channel with 25Gs/s and here 8 or 12 bit

author: gslick
author_rank: Frequent Contributor
timestamp: September 15, 2020, 03:48:06 pm
content: https://twitter.com/tektronix/status/1305891403247939585More channels. More bandwidth. Less noise. Introducing the 6 Series B MSO. Get up to 8 channels, 10 GHz, and 16-bit resolution, all with the lowest noise in the industry.https://www.tek.com/oscilloscope/6-series-mso-mixed-signal-oscilloscopeWhat's new in the B versionMore channels4, 6 and 8 channel modelsEven lower noiseIndustry-leading noise performance in all vertical ranges as percent of full scaleHigher bandwidth1- 8 GHz are still available. 10 GHz has been addedFlexible Sampling50 GS/s on 2 channels25 GS/s on 4 channels12.5 GS/s on >4 channelsSimplified securityAll user data is stored on a removable solid state drive
Video series on tinySA - Page 1
Forum section: electronics / testgear

author: erikka
author_rank: Regular Contributor
timestamp: September 12, 2020, 04:05:41 pm
content: For those interested, I'm doing a serie of videos on the tinySA as many people find watching video simpler than reading a wikihttps://tinysa.org/wiki/pmwiki.php?n=Main.Videos

author: tonyalbus
author_rank: Super Contributor
timestamp: September 15, 2020, 03:00:17 am
content: Hi EriKMy review of the tinySA
Comparing GM328A GM328B Transistor Testers - Page 1
Forum section: electronics / testgear

author: Karnathe
author_rank: Contributor
timestamp: September 14, 2020, 02:54:56 pm
content: Hello all,This question has absolutely been asked before, but I could not find it using search and wanted a "fresh perspective" since things might have changed.I am looking to buy one of the cheapo transistor testers. However, I want one with the encoder input and the function generator.A normal example would be this:https://www.aliexpress.com/item/4001178390170.html?spm=a2g0s.8937460.0.0.69a32e0ehIVCCjThis fulfills everything I need, with the consideration that it is coming from china and as such may not arrive for quite some time. I have heard that some of these have dodgy 5v regulator chips, and come with wildly varying firmware versions. If this comes with an old version, what am I missing? Can I update it myself?Does anyone have a recommended store, either from china or closer to home (located US)? Lastly, does anyone have a 3D printed case for these? My previous one has had the screen connector come off the lcd (any way to fix btw?) and I would rather that not happen again.P.S I am buying this because it seems like a good option for me as a student / hobbyist. If there are other products / projects to make / buy something like this, I'd love to hear them!Thank you!
Demand: Philips PM8810 information - Page 1
Forum section: electronics / testgear

author: Analogdevice
author_rank: Contributor
timestamp: September 14, 2020, 09:42:36 pm
content: Hi guys,I bought Philips PM8810 - logic trigger probe (it was nice piece) and now I'm starting to find out what it's usable for(Yeah, it's funny but that's me)Problem is, there is no documentation on the internet. I found some manual on ebay, but only for 8800 (similar one?). Do you have any information about this piece? Several BNC's and D-Sub's are installed, maybe it's not useless.Thank you very much! Greetings from Slovakia.
Tek TDS 340A/360/380 option 14 - Page 1
Forum section: electronics / testgear

author: Avia
author_rank: Newbie
timestamp: September 13, 2020, 03:09:09 am
content: Hi,When it comes to the Tektronix TDS 340A finding/buying the comms module called "option14" is proving to be quite a pain. The module adds a VGA port, rs232, gpib and a printer port. I'd really benefit from the VGA port and RS232 interface.Checking the service manual shows 6 pins from the main board connecting to the VGA board. This is likely connected the main boards DAC for the display, could it really be as simple as creating my own VGA cable to the main board? Anyone tried it? However, I don't have a clue which of the 50pins from the main board would be rs232...Any chance someone could provide a picture of the option 14 pcb from their scope?Thank you

author: Electrole
author_rank: Contributor
timestamp: September 13, 2020, 07:50:06 am
content: HiI have included a few shots that could be helpful.Also, check outhttps://www.eevblog.com/forum/testgear/tektronix-tds-340-experimenting-with-photos!/msg368479/#msg368479BR

author: Avia
author_rank: Newbie
timestamp: September 13, 2020, 01:10:08 pm
content: Thank you, it looks to me like I'll be able to get VGA out, without the option 14 module! RS232 does not look like it'll be possible without seeing the top side of the board which has all the connectors mounted to it.
Control and data logging software for Keysight 663x2A 663xB 661xC power supplies - Page 1
Forum section: electronics / testgear

author: Nx-1997
author_rank: Regular Contributor
timestamp: September 22, 2020, 06:17:58 am
content: I got tired of using the 6612C's front panel to enter voltage and current values. This software only runs on Windows. You will need a null modem adapter/cable and a serial cable.Download Link -https://github.com/Niravk1997/663x2A-663xB-661xC-System-DC-Power-Supply-Software/releases/tag/1.0.0GitHub link -https://github.com/Niravk1997/663x2A-663xB-661xC-System-DC-Power-Supply-SoftwareVideo link -https://youtu.be/n55Bx5ncqkMMain feature:Plug and play, nothing to install, just connect your power supply to your computer and run the softwareLog data from your power suppliesControl multiple power supplies by running multiple instances of the softwareReal-time voltage, current, and power graphs. Can be visually customized and interacted with
FLUKE 867 graph DC offset and noisy 8 bits ADC  - Page 1
Forum section: electronics / testgear

author: harrimansat
author_rank: Regular Contributor
timestamp: September 12, 2020, 05:45:29 pm
content: Hi,I just bought a fluke 867B. It has two problems, dc offset in the graph, and a lot of noise in the graph when it approaches at 0v, 1v dc for example. I have seen that there are many with the same problem, does anyone know how to solve it?Double slope converter works well, problem is the 8 bits adcThanks!
Tektronix TDS3000 "Low resolution" warning ???? - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: August 25, 2020, 03:40:18 pm
content: Hi,does anyone know why a TDS3054 shows a 'Low resolution' warning from around 315MHz onwards for the frequency measurement ?10K points at 5GS/s, that should be more than enough for a frequency measurement up to 500MHz, no ?I'm using a sine wave, 500mV pk-pk, 50 ohm, real-time samplingI first thought my siggen was at fault (maybe it was, but it died in the meantime...), but now I've got a calibrated R&S SML, so that won't be the issue... then I thought "well, it's because I hacked it from 100 to 500MHz", but I just checked with a 'native' TDS3054, and it's exactly the same ....I'm a software guy, so sorry if I'm missing the basics here... ;-)

author: Jwalling
author_rank: Unknown
timestamp: August 25, 2020, 04:00:07 pm
content: I don't know the why, but it is normal for these scopes

author: David Hess
author_rank: Super Contributor
timestamp: August 27, 2020, 01:08:41 pm
content: I do not know what threshold Tektronix uses but one cycle at 315 MHz is only 16 sample points at 5 GS/s. Frequency is the reciprocal of the time between the 1st and 3rd mesial measurements.

author: darkstar49
author_rank: Frequent Contributor
timestamp: September 11, 2020, 03:41:12 am
content: Quote from: David Hess on August 27, 2020, 01:08:41 pmCould you elaborate a bit ?? Are you saying the 5GS/s are the problem ? A DPO4054 with half that sampling rate doesn’t have that problem...

author: MarkL
author_rank: Unknown
timestamp: September 11, 2020, 03:05:06 pm
content: The TDS3000 user manual says the frequency is computed as the "Reciprocal of the period of the first cycle in the waveform." So, even if you have the measurement set to the whole capture record, it apparently doesn't use it.If you put the scope in dots mode and then do a single shot capture, perhaps it will better illustrate the warning. There just aren't many data points for computing an accurate frequency in one cycle.If you want a more accurate and stable frequency measurement, you could turn on measurement statistics and look at the mean frequency over a number of captures. Or, turning on waveform averaging will do the same thing. But neither will get rid of the warning.

author: David Hess
author_rank: Super Contributor
timestamp: September 12, 2020, 04:26:55 pm
content: Quote from: darkstar49 on September 11, 2020, 03:41:12 amIs that real time sample rate or equivalent time sampling rate which is probably at least 50 GS/s on the TDS3054 at 1ns/div? The DSO generates the low resolution warning based on the number of available sample points in the processing record. This should only be a problem on the TDS3054 when making single shot captures where the same rate really is limited to 5 GS/s.
Electro Static Voltmeter - Page 1
Forum section: electronics / testgear

author: jpb
author_rank: Super Contributor
timestamp: September 11, 2020, 08:13:19 pm
content: I just made a fun purchase on ebay - a Voltmeter for static electricity (to check what static you're carrying):At RS it is an eye-watering £478:https://uk.rs-online.com/web/p/esd-test-meters/2127602/So when I saw one on ebay for £15 I thought it was worth a punt but didn't expect it to work very well.It arrived today, I tried touching the sensor myself and only registered zero volts so thought it was probably broken - but then I thought to apply my Fluke 1507 insulation tester and it works surprisingly well:Fluke Voltage Measured56V 50V111V 110V277V 270V527V 530V1053V 1060VSee attached photosIncidentally the test date inside the battery apartment is 22/12/03 so it is almost 17 years old.