hybridfree/eevblog-posts huggingface dataset:
calibration/adjustment procedure for CEM DT-9939 /EXtech EX540 /Digitech QM1575 - Page 1
Forum section: electronics / testgear

author: MacGyver0606
author_rank: Newbie
timestamp: July 08, 2021, 08:31:59 pm
content: Hi, I'm looking for the calibration/adjustment procedure for any of these Multimeters, which are pretty much the same. I couldn't find it anywhere. Any help??CEM DT-9939/DT-9929 (original manufacturer)EXtech EX540/EX530 (Americas/Europe)Digitech/Jaycar QM1575 (Australia)Hikari HM2920/2900 (Brazil)

author: threephase
author_rank: Regular Contributor
timestamp: July 13, 2021, 09:24:55 pm
content: You can usually get calibration procedures for Extech instruments from Extech support, takes them a couple of days to respond:-http://www.extech.com/support/faq5th question down the page

author: danilnik
author_rank: Newbie
timestamp: August 14, 2023, 06:04:48 am
content: Good day. You have successfully obtained the calibration procedure for the DT-9969. If it's not difficult, please share)
OWON SPE3102 Review (Spanish) - Page 1
Forum section: electronics / testgear

author: jemarro12
author_rank: Contributor
timestamp: August 14, 2023, 08:50:31 pm
content: I've made a review of this switching PSU. In overall is ok for the price, navigation and loud fan noise are the worst part.I hope u enjoy!https://youtu.be/jA4Xg0ftoJI
Fluke 15/17 B+/Max slow settling on resistance function. - Page 1
Forum section: electronics / testgear

author: mqsaharan
author_rank: Regular Contributor
timestamp: August 14, 2023, 12:41:31 pm
content: Hi,Has anybody tired of slow settling of resistance function on Fluke 15/17 B+/Max?I just saw the following video on Youtube. I don't understand the language but from the title and what the guy was doing in the video it was obvious. From the comments I found out that he replaced the C7 capacitor with 1nF (C0G type I presume). Could someone who understands the language, please tell us what he is saying about the capacitor? Is he replaced the capacitor because the installed value was high or was it just unstable for its required function?With a quick search on internet, I found from a site called Sprites Mods (https://spritesmods.com/?art=fluke15pluswifi), the chip used in these meters is FS98O24.In the datasheet the C7 is installed at pin number 7 and 8 and these are ADC Pre-Filter Capacitor Connections. And the datasheet suggests a 27n capacitor there. From video it looks like 27nf is installed by the company.The picture of 17B+ was taken fromhttps://lygte-info.dk/review/DMMFluke%2017B%20UK.htmlThanks.Edit: Tried to make some language corrections.
NICE-POWER Programmable DC Power Supply 30v 10a - Page 1
Forum section: electronics / testgear

author: jimbo493
author_rank: Newbie
timestamp: August 14, 2023, 03:00:28 am
content: Hey all,I was curious if anyone has used these power supplies before?https://www.amazon.com/NICE-POWER-Programmable-Precision-Adjustable-Regulated/dp/B0C686ZYPF/ref=sr_1_5?keywords=Programmable%2BPower%2BSupply&qid=1691978853&sr=8-5&th=1I am looking for something cheap and PC controllable, ideally with a hackable protocol so I can integrate into a different program. I am hoping to make a test box for pixel addressable LEDs that would also have a pixel controller, you could choose the pixel type and then it would send a voltage and current limit to the PSU, rather than having to look it up and dial it in. 30v 10a seems like the ideal size since I deal with LED tape ranging from 5-24 volts, and spools rarely consume more than 4-5amps.If you have any other ideas in the sub $100 price range let me know. Ideally something that has been hacked before/has a documented protocol. I did order the one linked above, mostly so I can see if the protocol is usable.
Spring tips for PMK PML-711A or similar (e.g. LeCroy PP008) - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: August 02, 2023, 10:33:59 am
content: Spring tips for these are sold at prices around gbp35 for five (PicoTech). They are 0.65mm dia and 16.5mm longI wonder whether a P50-B1 pogo pin (e.g. Harwin P13-0123) would fit these (nominal 0.68 dia 16mm long). If so, they're available for about gbp7 per hundred, which is a LOT more reasonable!D.

author: perdrix
author_rank: Frequent Contributor
timestamp: August 13, 2023, 10:57:13 am
content: I ordered a pack of 100 P50-B1 pogo pins from eBay for the grand sum of GBP3.35 (about USD4).They fit my LeCroy PP008 probes perfectly, so for less than 1/10th the cost of five spring tips from Pico (the cheapest source for the official parts I could find), I now have 100 replacement tips.I'd call that a winDavid
Cheapest way to test 5G Cell Output Power - Page 1
Forum section: electronics / testgear

author: Generalquark
author_rank: Contributor
timestamp: August 12, 2023, 10:42:12 pm
content: Hi,I have alot of friends who are not in the electronics world who are often telling me all the problems with 5G and how dangerous it is. I don't currently have any equipment that can measure power levels in the 26 to 29 Ghz range. I was curious if anyone is familiar with any low cost equipment that I can show my friends what the output of the transmitters is so that we can have a more productive discussion on the topic rather than what some expert on the internet is claiming. I am not saying they are wrong, just agnostic on the subject until I have some data.Thanks!

author: wasedadoc
author_rank: Super Contributor
timestamp: August 13, 2023, 06:20:13 am
content: As with 2G, 3G and 4G isn't the power ouput of the phone more relevant? Much shorter distance.
R&S CMU200 Practical Function Below 10 MHz - Page 1
Forum section: electronics / testgear

author: BabyRuth?
author_rank: Newbie
timestamp: August 12, 2023, 10:24:12 pm
content: I have been researching the CMU200 for a few weeks, scouring various forums, viewing all the YT vids and reading the R&S documentation. I'm interested in the device for the various measurement tools, such as RF power analysis, RF generator, AF generator/analyzer, etc. I have a separate spectrum analyzer with tracking so that part is not as important. My application is ham radio tinkering including HF.Here are some capabilities I'd like to get clarification on from CMU200 users:Am I understanding correctly that the primary RF generator (RF1) and RF power meter (wideband mode) operate down to 100 kHz?When measuring RF power below 10 MHz, does the frequency counter still display with some level of accuracy, or at all?I understand that RF input power is reduced (2 W) when the additional RF generator option is fitted (option CMU-B96). Is it easy to remove this option if needed to restore the higher power capability (50 W)?Are there any other bonus functions that still operate below 10 MHz (at possibly reduced precision/performance) despite the datasheet?Thanks in advance!
RTB Trigger Bug? - Page 1
Forum section: electronics / testgear

author: Darkover
author_rank: Regular Contributor
timestamp: August 12, 2023, 01:17:47 pm
content: Hi everyone,From time to time I notice a strange behavier of my RTB2004. I would say it happens every 2-3month.So I am interested if I am alone.Let me describe what happens this time:Yesterday I used the logicprobe with SPI decoder and also CH1. Triggering was on the logicprobe. After the work I switched of the scope.Today I disconnect the logicprobe and switched on the scope after disconnecting the logic probe. I switched of the SPI-Decoder and also CH1, I switched on CH3.I connect an iProber current probe on CH3 to measure some current. This probe deliver 1V/A. I went to the probe menuand select current mode with 1V/A. With the triggering to automatic it was possible to see the signal. I shift the trigger levelto a good position and switched the scope to normal mode. But now it NEVER triggers!The iProber has a lever to shift the offset of the probe. I noticed that it was not possible to shift it to zero, it was possible to shitt it, but not far enought.Because of some experience in the past with unusual behavier of the RTB I switched the scope off and on again. But it changednothing. Everythink looks good in automatic mode, but no triggering in normal mode.I change the iProber to CH4 with the same paramater. It works perfekt!I changed back to CH1 and select an 1:1 voltage probe. This time the probe was working an triggering.I went back to the probe menu and switch it to current again. This time CH3 was working correct, too!From my experience the RTB sometime had problem with triggering if you used the logicprobe before!I am alone with this problem?Olaf
Vevor EM4659 clamp - Page 1
Forum section: electronics / testgear

author: tatel
author_rank: Frequent Contributor
timestamp: August 12, 2023, 12:58:39 pm
content: Do you think this thing could really be CAT III 1000 V? 1000 amps? I would say it looks waay too good to be true. But would like to hear the opinion of people more experienced than me:https://www.vevor.es/pinza-amperimetrica-c_12030/vevor-pinza-amperimetrica-digital-multimetro-digital-trms-5999-puntos-1000-a-voltaje-ac-dc-corriente-resistencia-diodos-continuidad-almacenamiento-de-datos-ncv-para-electrodomesticos-mantenimiento-p_010587466077?utm_source=favorite&utm_campaign=010587466077&utm_medium=93000448&utm_content=102010587466077923&utm_term=387Please note, I'm not even planning to buy it, but it has been recommended on a YT channel I follow
USB Prologix GPIB card can not connect to HH 8560E - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: August 09, 2023, 11:38:49 am
content: Hello,I am trying to connect to my hp 8560E using Prologix GPIB-USB module, contact with the module is ok , but can not send commands to the hp8560E. GPIB address is set to 0 in the hp8560E and the Prologix GPIB Configurator. Any clue?Thanks

author: Roehrenonkel
author_rank: Frequent Contributor
timestamp: August 09, 2023, 11:46:33 am
content: Hi hfrse,use unique IDs for Controller and Instruments.Good luck

author: tridac
author_rank: Regular Contributor
timestamp: August 09, 2023, 12:36:44 pm
content: Have done quite a bit of work with the network based Prologix, needed to get some of the lab instruments on the network. You need to set up the prologix adapter first, with it's own gpib address, and also, the gpib address of the remote instrument. The usb adapter looks like it has the same command set as the network version, so first make sure you can talk to the adapter. The ++help command should return a page full of text, so it's a good way to verify the comms path pc -> usb -> prologix, first. Once that's done, you should be able to send an instrument command that returns something in text, and you should be good to go.Just recently uploaded a project to sourceforge. Early days, and doc is a bit light at the mo, but its a complete stack that uses shell script at top level and abstracts the prologix and lower layers to simplify usage at the top. Versions for FreeBSD and Linux and even builds and runs on cygwin / windows. You can find the prologix init code in the functions.sh file. Present version is for the lan adapter, but it's modular, so should be able to modify for usb or other interface. No connection with the company btw, just something I needed for work. Find it here:https://sourceforge.net/projects/network-instrument-workbench

author: hafrse
author_rank: Regular Contributor
timestamp: August 12, 2023, 11:41:55 am
content: Hello,The I can access the Prologix module and send commands to my 8560E from a C# code but not through the Prologix Configurator by KE5FX GPIB tool. I am using windows 11.
Hantek DSO1202e stuck in boot/recovery loop - Page 1
Forum section: electronics / testgear

author: mrmax
author_rank: Newbie
timestamp: May 12, 2022, 01:00:52 am
content: Hello,My Hantek DSO1202e (s/n DSO1201169) was working but now on power up, it gets stuck in a boot/recovery loop as documented below. I was hoping something from the extensive DSO2D10 threads would apply and help, but no luck so far.I sent a message to Hantek support, but have received no response.Can't seem to communicate with it from PC to USB port (using the "DSO Measurement Device" device that does briefly pop up in Device Manager and then goes into a "failed" state).Also tried booting scope (and also choosing "Recover" from the boot menu) with Hantek's firmware image (dso1kb_func_hantek_dso_dso1202e_20160329.0.up) on USB stick but no luck.Does anyone know how to restore firmware or software on this unit?On power up:############System is not shut down properly last time, please select the start-up modePress F1 to reboot the systemPress F2 to recover the systemPress F3 to update the recover partition############# Pressing F1: reboot ###############The scope reboots to a blank screen and the AutoRange and Run/Stop buttons are lit.Nothing further occurs, even after hours in this state.############# Pressing F2: recover ###############The following sub menu is displayed:System recovery will reset the oscilloscope back to factory default settingPress F1 to confirmPress F2 to return###Pressing F1 displays:System is recovering...Please do not turn off the power!After displaying this for a few minutes, the scope reboots to a blank screen and the AutoRange and Run/Stop buttons are lit.Nothing further occurs, even after many hours.############# Pressing F3: update recover partition ###############The following message flashes very briefly:System is updating...Please do not turn off the power!Operation failed!...is displayed for a second before it returns to the main boot menu above (F1, F2, F3 options)Thanks for any help or insight!Max

author: eM
author_rank: Newbie
timestamp: January 05, 2023, 05:15:26 pm
content: Hi, I have the same fault on my DSO1202E. Did you manage to solve the problem?

author: mrmax
author_rank: Newbie
timestamp: August 12, 2023, 08:36:14 am
content: Seems like a few of us are suffering from thisI progressed to connecting an FTDI adapter to the motherboard and was able to access the low level interface. However, it is a "menu" of things you can do (limited shell?), and not the native OS (linux variant). I was unable to break out of that and get to the OS so I still have not been able to reflash with a functional scope image.
830 clones powered by 2*AAA batteries: main IC? - Page 1
Forum section: electronics / testgear

author: siealex
author_rank: Regular Contributor
timestamp: August 15, 2023, 01:05:37 pm
content: Does anyone know the type of the main IC used in 830-like cheap meters, but 3 V powered? It's clearly similar to 7106, but all 7106 clones known to me require 9..12 V, not 3 V.

author: siealex
author_rank: Regular Contributor
timestamp: August 15, 2023, 02:17:23 pm
content: MAX138??? It's too expensive for these el-cheapo meters.
Good "budget" programmable bench power supply - Page 1
Forum section: electronics / testgear

author: RiRaRi
author_rank: Regular Contributor
timestamp: August 09, 2023, 12:09:20 am
content: I want to get good 30V 5A programmable DC power supply and was looking at Sigilent SPD1305X and Rigol DP711. These two have low noise and are linear which is very good since i deal with solid state radios. Which one would you reccomend in this price range?

author: thm_w
author_rank: Super Contributor
timestamp: August 09, 2023, 12:17:52 am
content: Use the Search functionhttps://www.eevblog.com/forum/testgear/power-supply-recommendation/https://www.eevblog.com/forum/testgear/rigol-dp711-and-dp712-new-1ch-psu/https://www.eevblog.com/forum/testgear/finally-chosen-a-power-supply!-siglent-vs-rigol-)/

author: tautech
author_rank: Super Contributor
timestamp: August 09, 2023, 12:55:16 am
content: Quote from: RiRaRi on August 09, 2023, 12:09:20 amKnowing the Siglent PSU's quite well I would spend a little more for the 3ch SPD3303X-E and use it in Parallel channel mode for its 6A capability and in Serial mode for 60V capability.Should you need more, several units can be placed in series for elevated voltages.We do sell the odd 1305X but many more SPD3303X-E.Then there are the hacks......

author: RiRaRi
author_rank: Regular Contributor
timestamp: August 09, 2023, 08:29:49 pm
content: Thanks. Now i dont need extra channels. But in the other hand, it is not much more expensive so i might choose that one. I also heard that 3ch one is better built quality and has better IC inside. Is that true?

author: larsdenmark
author_rank: Regular Contributor
timestamp: August 10, 2023, 11:30:15 am
content: A cheaper option is this one: Manson at 200€https://www.reichelt.com/de/en/programmable-laboratory-power-supply-unit-with-usb-interface-hcs-3202-p106617.htmlIt comes with its own proprietary software so you need to check that the software can do what you want it to do.

author: Veteran68
author_rank: Frequent Contributor
timestamp: August 10, 2023, 07:13:30 pm
content: Quote from: larsdenmark on August 10, 2023, 11:30:15 amThat's a SMPS though. May still work fine for OPs needs and they are cheaper than linears if he can tolerate the noise. But for my only or primary PS I'd recommend saving a bit more pesos and get something like the 3303X-E mentioned above. I have a 30v/10a switcher as a tertiary supply that I use to power DC devices with, but for circuit development and troubleshooting work I prefer linears.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: August 10, 2023, 07:46:29 pm
content: Quote from: RiRaRi on August 09, 2023, 08:29:49 pmThe main benefit of having at least two channels is that you can configure the PSU to deliver both positive and negative rails. In my digital realm, it's rarely needed. But when I do venture into analog territory, it's often a requirement (or at least very, very handy).
New Power Analyzer HIOKI PW8001 - Page 1
Forum section: electronics / testgear

author: openyk
author_rank: Contributor
timestamp: August 15, 2023, 12:00:24 am
content: Intended for inverter development.These use input modules (18-bit 15MHz U7005 and 16-bit 2.5MHz U7001).Pricing I'm guessing somewhere between $50K and $100K, based on current price of their previous gen.https://www.hioki.com/global/products/power-meters/power-analyzer/id_412384How often do people post reviews of more expensive tools like this? Want to know if I should be pushing for this at work.

author: KE5FX
author_rank: Super Contributor
timestamp: August 15, 2023, 04:05:46 am
content: I really like the enclosure they're using, with the small plug-in modules in back.Seems like this sort of thing should be wireless, though. Who wants to string instrumentation cables all over the place when making multichannel power measurements?
Is the YIG tuned oscillator still used in modern microwave signal sources? - Page 1
Forum section: electronics / testgear

author: alan.bain
author_rank: Regular Contributor
timestamp: August 10, 2023, 09:22:13 pm
content: This question should I thought be easy to answer by looking at some keysight service manuals, but they don't seem to be like the HP manuals of days gone by.... in fact they seem to say almost nothing about how the test gear works. Hopefully some engineers are curious enough to remove the covers?Is the principal voltage controlled oscillator in microwave generators still the YIG tuned oscillator or has that gone the way of the BWO? In which case what has replaced it? Appreciate that the band which was easily attained directly has increased, but even the multiplier type generator tended to use a YIG tuned filter to pick the right harmonic.Alan

author: pdenisowski
author_rank: Super Contributor
timestamp: August 11, 2023, 10:02:58 am
content: We (R&S) use YIG oscillators in some of our generators:" For applications requiring the lowest possible phase noise across the entire offset range, an option with a YIG oscillator is available that can be used to attain a value of –132 dBc/Hz(typ.) for a 10 GHz output frequency at offsets from 10 kHz to 100 kHz."More in the article about the YIG oscillators:https://cdn.rohde-schwarz.com/magazine/pdfs_1/article/218/english_21/NEWS_218__09_SMA100B__english.pdf
Spectral Dynamics SD340 Micro FFT Analyzer - Page 1
Forum section: electronics / testgear

author: andymouse
author_rank: Contributor
timestamp: August 08, 2023, 12:21:28 am
content: Hi all,I have seen this instrument for sale and I wonder what it's primary function is, from the front panel I would say it is used for audio signals and produces an FFT output. If it is for this I can't find any specs on it, is it any good ? how does it stack up against a modest 8 Bit scope ? whats its function otherwise ? I want to analyse audio signals beyond what my scope can achieve and am looking for a SA that starts at DC and up but not having much luck. I am looking at Wien Bridge oscillators and stuff. Can anybody shed some light on these devices for me please ? and as I said what is this instruments purpose and Spectral Dynamics haven't got back to me so I wondered if anyone here has used one...Thanks in advance.
APEX tour in CA test equipment instrument and much more - Page 1
Forum section: electronics / testgear

author: oz2cpu
author_rank: Frequent Contributor
timestamp: August 07, 2023, 09:04:29 am
content: Much recommended place !! if you are into vintage, restore, Instruments, and all sorts of older parts and such,Military, Avionics, Commercial, and of course also a lot from TV movie prop stuff,even also a bit nasa and other rocket stuff found.you will se many cool instruments from Tektronix, Hewlett Packard and so on.They also got a huge collection of vacuum tubes,this 30mins video contain 400 pictures and 5 video clips, it shows most of the areasand most of the stuff i found interesting, recorded in 2019,finally i got around to make and release the video,took me 2 days to edit this, wow hard work.. Hope you enjoy ithttps://youtu.be/0rBnofX5VwI
Schaffner CPW9670 Powemeter manual needed - Page 1
Forum section: electronics / testgear

author: dxl
author_rank: Regular Contributor
timestamp: August 06, 2023, 03:52:36 pm
content: Hi,i couldn't resist and bought this powermeter on ebay:https://www.ebay.de/itm/334958415802However, there's almost no documentation on the internet available. Does anyone know how to read measurement values from the serial port? Or even better, have a manual?It doesn't have much inside - 4 sensors, two MUX's, one SPI ADC and the microcontroller. The microcontroller seems to have the ISP fuse blown, at least i wasn't able to read the firmware the via SPI. Don't have a 44 pin adapter to try parallel programming.The 4 converters are providing a DC voltage equivalent to the measured power, 0V for -30dBm, +2.5 for about 15dBm. All 4 inputs are generating the same voltages, so all channels seem to be ok. It would likely be not to hard to write a custom firmware for this unit, but maybe someone knows how to use them.Thanks!

author: Martin72
author_rank: Super Contributor
timestamp: August 06, 2023, 07:12:33 pm
content: Hi,It seems that the powermeter works or worked with the radimation software:https://wiki.radimation.com/wiki/index.php/Chapter_15https://wiki.radimation.com/wiki/index.php/Schaffner_CPW9670_Channel_1Have you tried to contact schaffner directly ?

author: dxl
author_rank: Regular Contributor
timestamp: August 06, 2023, 07:46:36 pm
content: Quote from: Martin72 on August 06, 2023, 07:12:33 pmYes, i contacted them last week, but they said they sold the EMC division about 20 years ago to Teseq. So i contacted them today, lets see whether there will be a response.

author: dxl
author_rank: Regular Contributor
timestamp: August 06, 2023, 07:51:13 pm
content: The thing responds to *IDN? via the serial port and says:Code:RF Power Meter: Iss 0.0p
philips pm3055 scope read serial data - Page 1
Forum section: electronics / testgear

author: david17
author_rank: Newbie
timestamp: August 05, 2023, 06:24:11 pm
content: Hi, thanks for reading this.I'm trying to read the data from the RS232 socket on the rear of the scope with python3.If I doser_in = ser.readline()print(ser_in)I get lines of hex code starting with b'B\ then hex code.I have tried decode 'UTF8' I then get odd text and numbers scatted over the screen.baudrate of 2400 seams, better than 1200.I can not find any info in manual or online.I don't know what is being sent, is this maybe a waste of time anyway.Thanks for any help.

author: RAPo
author_rank: Super Contributor
timestamp: August 05, 2023, 06:56:56 pm
content: You can setup the rs232 settings (baud, parity etc) via the RS232 sofcal menu. Use Menu Fn-2 key.

author: ledtester
author_rank: Super Contributor
timestamp: August 05, 2023, 07:12:32 pm
content: Here's what I found in this manual:https://www.qsl.net/vk5bar/AHARS-Resources/Philips%20PM3055/Philips%20PM3055%20Operating%20Manual.pdfpage 18:

author: david17
author_rank: Newbie
timestamp: August 05, 2023, 07:34:36 pm
content: Thanks, I never found that manual. So the 9 pin socket is not an RS232, it's a MAT 3220 Philips llc bus. Used for remote control.Thanks for your help.

author: DavidAlfa
author_rank: Super Contributor
timestamp: August 05, 2023, 07:45:12 pm
content: I have this scope, it doesn't have any smart functions like reporting data, measurements etc, it's purely for remote control.
HP 16702A with 16701B expansion frame - Page 1
Forum section: electronics / testgear

author: MateKrisz
author_rank: Regular Contributor
timestamp: August 03, 2023, 09:25:35 pm
content: Hi,I have a HP 16702a and I extended it with a HP 16701B. Now I can use 10 cards in the logic analyzer.The main system see the newly added frame, but didn't see the cards on the expansion frame. 'pv' said F to I is empty slots.The card is working in the main frame. I need to change something on the main config? Or it is discover these cards automatically?The catalog said that 16702A working with 16701B.Anybody has same issue?

author: aeg
author_rank: Regular Contributor
timestamp: August 04, 2023, 08:52:54 pm
content: I think the cards should just show up in the expansion frame tab.Are the fans on the 16701B running?Any bent pins on the cable?

author: MarkL
author_rank: Unknown
timestamp: August 04, 2023, 10:13:31 pm
content: For a 16702B in combination with the16701B, the cards indeed just show up.Perhaps a simple question, but do the cards you're trying in the 16701B work in your 16702A?

author: MateKrisz
author_rank: Regular Contributor
timestamp: August 05, 2023, 11:16:24 am
content: Hi MarkLOf course I tested them with my 16702A. I tried different cards, but not helps...The catalog said that 16701B works with 16702A.See on the screen picture. Looks like that the system see the expansion frame, but not show the cards.Stupid question, but no need to do a sw update, or install additional package for this? I checked the analyzer menu but I not found any useful for this. Maybe a voltage missing for the cards in expansion frame?

author: MateKrisz
author_rank: Regular Contributor
timestamp: August 05, 2023, 11:27:31 am
content: Hi aeg,Yes the fans running well. The cable between the 2 unit is simple. or mixed the wires in the cable? I not found any info about this.I will check the cable connections, but it's like an original and non possible to repair. No screws on the connector. Cable number is: 16701-61604

author: MateKrisz
author_rank: Regular Contributor
timestamp: August 05, 2023, 01:51:18 pm
content: Hi MarkL and aeg,Good news! Looks like working fine the extender. I cleaned the connectors with IPA and worked well. I surprised that only it's needed this. I thought any incompatible issue between the two unit.
using Li-ion battery in Fluke 97 scopemeter - Page 1
Forum section: electronics / testgear

author: feedback.loop
author_rank: Frequent Contributor
timestamp: August 12, 2017, 07:00:47 am
content: I got this meter quite cheap with no accessories and no battery pack. Replacement Ni-CD and NI-MH packs are sold for $20-30, but, instead of spending money on obsolete technology, I decided to figure out if I can use Li-ion cells to build a pack for free. I have plenty of various used cells salvaged from laptop packs and such. It turned out that it is easy to use 2-cell Li-ion packs in this meter. Such configuration is not perfect, but works fine. I ended up adding a battery management module for about $3 for extra safety and, hopefully, longer life of the pack.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: August 12, 2017, 07:11:04 am
content: Here is the battery management module I used:

author: texaspyro
author_rank: Super Contributor
timestamp: August 12, 2017, 02:58:19 pm
content: One big advantage of only charging the cells to 4V is that they will last 10 .. 100 times longer than fully charging them.I would also look at using low self discharge NiMH cells. The 8V charge voltage is the open curcuit voltage. The charger circuit is current driven, so it will limit the voltage to whatever it takes to get 170 mA to the pack.I built a replacement pack for my Tek THS730A using 4500 mAh AcuEvolution C cells around 10 (?) years ago. Avoid no-name Chinese cells like the plague. It is still running fine. At times, the scope has sat around un-used for months and still powered up and ran for a long time. I have never felt the need to do a run-time test on the scope.Since the NiMH cells have over twice the capacity of the nicads, the charge rate works out to around C/30. OK-ish for a NiMH trickle charge. I try to avoid leaving it on charge for extended periods, but occasionally left it charging for a week or so. The cells get pleasantly warm.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: August 26, 2017, 02:55:15 am
content: Finally I monitored the discharge of the new LiPo pack from 8V in the meter. The runtime was about 10.7 hours.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: September 09, 2018, 07:00:18 am
content: This is a followup to the Fluke 97 Li-ion Battery Upgrade video. A very cheap Fluke 99 was picked up on eBay with some problems. A Lipo pack was built for it. This time the charging voltage was adjusted from 8V to 8.4V, and also the charging current was doubled.

author: feedback.loop
author_rank: Frequent Contributor
timestamp: September 23, 2018, 07:49:09 pm
content: Improvised battery door (I happened to have only white plastic of the right size and thickness handy).

author: Swake
author_rank: Frequent Contributor
timestamp: August 05, 2023, 01:49:15 pm
content: These covers are not really visible, anyhow it is nothing that a lick of paint can't resolve if you want to.Thank you for the video's on the battery. These made my quest for a modernized battery to help out a freshly acquired PM97 much easier.
Siglent SDL1020X-E high-pitch noise - Page 1
Forum section: electronics / testgear

author: alo
author_rank: Newbie
timestamp: July 18, 2023, 12:56:23 am
content: Has anyone else noticed a high-pitch noise coming from their Siglent E-load SDL1020X-E?Only the youngest 3 (age 23-25) out of a dozen of us can hear it. The high-pitch noise seems to randomly start or stop whenever the left arrow or right arrow buttons are pressed. This only happens when we're providing current to the E-load.We really like this product but the high-pitch noise issue has deterred us from buying one after we gave it a trial. Did we just happen to trial a faulty one or is this an inherent problem with this product?

author: TheDefpom
author_rank: Frequent Contributor
timestamp: July 18, 2023, 01:07:40 am
content: Um the SPD is a power supply not a load… you weren’t connecting it to another power supply were you?

author: tautech
author_rank: Super Contributor
timestamp: July 18, 2023, 01:33:22 am
content: Quote from: alo on July 18, 2023, 12:56:23 amWelcome to the forum.Can we ask whom supplied it ?If you are near us in Auckland we would like to see and know more about this issue.

author: alo
author_rank: Newbie
timestamp: July 18, 2023, 01:52:02 am
content: Oh sorry, wrong product number. Should be SDL1020X-E. Corrected now.

author: alo
author_rank: Newbie
timestamp: July 18, 2023, 01:53:05 am
content: Quote from: tautech on July 18, 2023, 01:33:22 amI'll send you a PM.

author: tautech
author_rank: Super Contributor
timestamp: July 18, 2023, 02:04:16 am
content: Quote from: alo on July 18, 2023, 01:53:05 amThanks A, returned and we can work with emails now I know whom you are.

author: TheDefpom
author_rank: Frequent Contributor
timestamp: July 19, 2023, 09:09:03 am
content: I tried an experiment with my SDL1020X-E (upgraded to be a 1030X).I loaded it down to 4A (120W at 30V) and monitored the unit for sound using my Audio Control SA3050A Audio 1/3 Octave RTA (has 30 bands from 25Hz to 20KHz), this has a sensitivity of ~50dBm using its OEM calibrated microphone. It did not register any noise from the SDL under load and when pressing buttons, of course the noise could have been higher than 20KHz, I used to be able to hear to about 24KHz when I was younger, now it is only about 12KHz, that and the ringing in my ears....The only noise present were the key beeps (which I personally like to have turned on, usually)

author: MaTkEOxjC
author_rank: Contributor
timestamp: August 04, 2023, 07:34:44 am
content: I've got a similar issue, documented with two videos and spectrum/waterfall chart besides it;https://www.eevblog.com/forum/testgear/siglent-sdl1020x-e-high-pitch-(16khz)-noise-upon-button-press-(defect)/It happens sporadically, sometimes until the next button press occurs, sometimes for a fraction of a second.Independent of the button (all buttons affected).Independent if a load is connected or not.
TE & Humidity - Page 1
Forum section: electronics / testgear

author: luudee
author_rank: Frequent Contributor
timestamp: August 10, 2023, 11:03:27 am
content: Hi Guys,I'm an expat living in Thailand now. I have set up a nice lab with lots of modern testequipment. Scope, Spectrum analyzer, power supplies, various meters, etc.So far, everything has been working quite well for many years. However, we do havevery high humidity here. When it's dry and sunny, it might be as low as 55% RH, ona rainy day, it can be as high as 90%RH.Is this something I should worry about? I do let me equipment warm up as recommendedby the manufacturers, and often let it warm up twice the recommended time.Even when I run the A/C all day long, I don't see the humidity decrease. But then, I ranthe A/C only during office hours.Any ideas, recommendations, suggestions?Many Thanks,luudee

author: coromonadalix
author_rank: Super Contributor
timestamp: August 10, 2023, 11:40:16 am
content: well i would say you have to be more in control of the room temperature and humidity if you do really serious stuff ...it can play tricksdo you have an dehumidifier ??

author: Messtechniker
author_rank: Frequent Contributor
timestamp: August 10, 2023, 12:03:24 pm
content: Measure the absolute (not relative!) humidity outside and inside. i.e. g/m3. Open the windows (either manually or maybe even automatically) when the absolute humidity outside is lower than the inside humidity.Doing so helped me reduce the relative humidity level in my basement lab to 50% - 60 % in extreme cases (hot and rainy summer) to 70%. No more water condensation on the basement floor and on the equipment standing on the floor.Anyway its worth a try before getting a dehumidifier which will have electricity costs.
Rigol DS8000-R series (1 GHz and 2 GHz models) - Page 1
Forum section: electronics / testgear

author: tv84
author_rank: Super Contributor
timestamp: August 17, 2020, 08:40:15 pm
content: New Rigol scope:https://www.rigol.com/products/oscillosopes/DS8000-R.htmlIt sure is compact.Who will be the first to test one?

author: zhongzuocheng520
author_rank: Contributor
timestamp: July 25, 2023, 06:02:02 am
content: Can this model be hacked now?

author: zhongzuocheng520
author_rank: Contributor
timestamp: August 03, 2023, 02:18:38 pm
content: DS8034-R poor only one option, help master to help crack him, what software information is needed.The oscilloscope is long。14.992mhzDismantle
K&H KI-3020D Curve Tracer - Page 1
Forum section: electronics / testgear

author: slugrustle
author_rank: Frequent Contributor
timestamp: August 02, 2023, 04:15:04 am
content: Does anyone here have experience with the K&H KI-3020D curve tracer or with K&H as a brand?https://www.kandh.com.tw/ki-3020d-digitized-semiconductor-curve-tracer-ki-3020d.htmlA PDF catalog with more information than their website is attached.I was looking for a curve tracer that is at least somewhat affordable and still manufactured. There are not very many products like that.

author: Kean
author_rank: Unknown
timestamp: August 03, 2023, 11:59:59 am
content: I don't know anything about their test equipment or other products, but as a brand they've been well known for a long time for their good quality solderless breadboards.
Suin SA1000 series specrum / network analyzer - Page 1
Forum section: electronics / testgear

author: slugrustle
author_rank: Frequent Contributor
timestamp: August 02, 2023, 04:05:30 am
content: While looking for a spectrum analyzer / vector network analyzer that has a frequency range extending to <1kHz and preferably a switchable 1MΩ / 50Ω input impedance, I stumbled across the Suin SA1000 series (SA1030, SA1080, SA1140). Does anyone here have any experience with these products or this brand?https://www.suindigital.com/frequency-characteristic-analyzer/560.htmlThese analyzers seem to be available from stratatek, although not the SA1216 or SA1220 models listed on Suin's website.https://www.stratatek.com/product-page/suin-sa1000-series-frequency-characteristic-analyzerI have reached out to both Suin and Stratatek to ask for more detailed specifications and/or a datasheet or manual. If they send a file and allow it to be posted here, I'll add an update.
Quieter fan for ET5410A+ - Page 1
Forum section: electronics / testgear

author: HwAoRrDk
author_rank: Super Contributor
timestamp: August 01, 2023, 07:05:59 am
content: I recently got myself an East Tester ET5410A+ electronic load, but I'm finding the loudness of the fan a bit wearying. Also, mine seems to have a slight intermittent rattling sound. Has anyone replaced the fan with something quieter?I can't see what kind of fan it is without disassembling some stuff (label is not visible), but it seems to be an 80mm fan - is that right? But as for ratings, etc. I'm not sure what's required. It's a two-pin connection on the fan, so no tacho output required at least. I found some reverse-engineered schematics inanother thread on herewhich indicate it is 12V and speed is controlled by PWM, but there also appears to be some kind of fan monitoring circuit. If I'm interpreting the schematic (see attached) right, it's some kind of current-sensing circuit? I guess I would need to find a fan that has similar current draw?BTW, my review of it so far is that it's a decent piece of equipment, with my only complaint so far being the fan noise and that the front panel buttons have an occasional responsiveness issue - sometimes you'll press a button and the unit will beep, but the button press isn't recognised. It's almost like the beep is triggered by an edge on the button signal, but the software has a de-bounce that's a little too over-zealous and which requires buttons to be pressed for a certain minimum period.I also had to chuckle at the as-supplied fuse situation. It came with a proper UK mains cable (which I wasn't expecting), but the plug had a 13A fuse!I swapped it for a 3A one. And then you get two spare fuses for the fused IEC connector on the back, but it's confusing because these fuses (and the one already fitted) are 0.5A but the IEC receptacle has "Use only with 2A 250V fuse" written on it.

author: HwAoRrDk
author_rank: Super Contributor
timestamp: August 01, 2023, 11:35:14 pm
content: I simulated the fan control and monitoring circuit and it's using the PWM to control linear regulation of the voltage supplied to the fan (hence the heatsink on Q6, which is probably dissipating >0.5W at 100% fan speed). The lower part of the circuit is indeed doing current sensing, but translating that into a logic low/high indicating basically whether the fan is running. The threshold seems to be about 45mA, below which point output FAN_OK will go high (so it's actually active-low for 'OK').I don't understand what the zener diode Z4 is doing, but it seems to have the effect of enforcing a minimum regulated voltage to the fan. And why they are using three 1.5k pull-up resistors instead of a single 500 ohm (or maybe 470) I don't know.Given that, I can probably use any 12V fan and the control circuitry will be happy.Not sure about whether the fan may need to be tailored towards higher static pressure, as the fins of the heatsink and outlet grille of the fan on the rear panel are quite restrictive.
Rohde & Shwarz FSH3 FSH6 Portable Spectrum Analyzer repair  - Page 1
Forum section: electronics / testgear

author: smaultre
author_rank: Regular Contributor
timestamp: August 01, 2023, 09:52:13 pm
content: Hello i've got a device that do not start. Two oscillators continuously works after powering it. Anybody knows how to check the flash (dump from another working and refill to broken) ?
Question for Siglent regarding rack mounts. - Page 1
Forum section: electronics / testgear

author: BillyO
author_rank: Super Contributor
timestamp: August 01, 2023, 04:18:14 pm
content: Does anyone with a lot of Siglent experience (tautech?) know if the SDL1000 series loads would fit into the rack mount for the SDM/SDG series?If not, are Siglent planning a rack mount for the SDL?

author: tautech
author_rank: Super Contributor
timestamp: August 01, 2023, 09:03:26 pm
content: Quote from: BillyO on August 01, 2023, 04:18:14 pmThey should fit however SDL has some additional rearward mass compared to SDM/SDG models and might need additional rear support.Give the NA branch a call or email.https://siglentna.com/contact-us/
Discount code / coupon for Welectron.com Germany or Brymen.Eu Poland - Page 1
Forum section: electronics / testgear

author: 1234deer
author_rank: Newbie
timestamp: July 31, 2023, 03:25:03 pm
content: Hello,has anybody a discount/ coupon code for Brymen meters on welectron.com or Brymen.Eu? Thanks.

author: JimKnopf
author_rank: Frequent Contributor
timestamp: July 31, 2023, 04:05:17 pm
content: Maybe as good as a Discount code is their "request offer" butten at welectron.com. Choose your device, checkout and during payment just click the option "request offer" instead of a payment methode. You can add some comments why you ask for special discount.

author: 1234deer
author_rank: Newbie
timestamp: July 31, 2023, 05:53:49 pm
content: Thank You Sir, I `ll try.

author: Martin72
author_rank: Super Contributor
timestamp: July 31, 2023, 05:58:00 pm
content: Hi,You could try the name of the pic..
DAWE phase meter - model 632A - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: July 29, 2023, 06:39:54 pm
content: I have spotted one of the above on a well-known auction site and it looks fascinating. I have their noise generator - nice bit of thyratron-fired valve gear.Does anyone have any information on the Dawe phase meter? It appears to have two inputs (max 10V each, one 'reference', one for difference).So, unsurprisingly it must be comparing one AC with another and calculating the phase angle, which is what it displays.Just looks like a fascinating bit of kit, but absolutely no information/schematics appear to exist.

author: factory
author_rank: Super Contributor
timestamp: July 29, 2023, 07:33:39 pm
content: The only part of Dawe that survived was the Ultrasonic cleaning part, it became Branson Ultrasonics in Slough, unfortunately they seem to have become part of Emerson (no mention in their history page), who knows if any archives survive?https://www.vintage-radio.net/forum/showpost.php?p=637854&postcount=18David

author: factory
author_rank: Super Contributor
timestamp: July 30, 2023, 04:01:32 pm
content: Found this on ePay;David

author: Andy Watson
author_rank: Super Contributor
timestamp: July 30, 2023, 04:37:33 pm
content: I think the font and style of that clipping is very reminiscent of Wireless World, especially "Reply card No ...".

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: July 30, 2023, 04:53:49 pm
content: Brilliant David, thank you.I had assumed it was valve, not solid state as the case and design mirror the Noise Gen I have which is very valve...
Rigol DG1022Z internal frequency reference  - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: July 29, 2023, 07:12:53 pm
content: What exactly does the above sig gen use as a frequency reference? Had one for about 5 or 6 years now and wondering what it’s long term accuracy is like. If I zero beat it against the national AM radio station there is about 0.2 ppm difference, but of course I don’t know how accurate the radio station is. For my purposes 0.01% accuracy for the sig gen would be good enough. Just wondering how good these things are.
Stand/Holder for Fluke 289 DMM - Page 1
Forum section: electronics / testgear

author: luudee
author_rank: Frequent Contributor
timestamp: July 22, 2023, 03:40:26 pm
content: Hi Guys,I own a Fluke 289, and I am looking for a stand/holder for it.The stand that comes with it (on the back) is a absolute piece of crap ....Short of wasting lots of time and 3D printing one, any pointers ?Would be nice to find a holder that is off the desk - e.g. can be attachedto a shelf and have the DMM "suspended in air" ...Thanks,luudee

author: audiotubes
author_rank: Regular Contributor
timestamp: July 22, 2023, 09:47:10 pm
content: My plan is to use magnetic holders, hangers etc. since I'm working on getting a bench with a steel backplane.

author: mwb1100
author_rank: Frequent Contributor
timestamp: July 22, 2023, 10:49:41 pm
content: Quote from: luudee on July 22, 2023, 03:40:26 pmFluke's "TPAK" (or 3rd party clones) straps/magnetic hanger should snap right into the back of the 289. Also, any strap narrow enough to thread through the TPAK receptacle should work just as well.Then you can hang it with a magnet, off of a rod, or even a nail.

author: luudee
author_rank: Frequent Contributor
timestamp: July 23, 2023, 09:11:29 am
content: Thank you guys !I totally forgot about that strip with the magnet !I already use magnets all over the place to hold my tools and misc items.Cheers,luudee

author: audiotubes
author_rank: Regular Contributor
timestamp: July 30, 2023, 02:55:19 pm
content: Looking good