hybridfree/eevblog-posts huggingface dataset:
aerial in OU T527 home experiment book - Page 1
Forum section: electronics / beginners

author: armandine2
author_rank: Frequent Contributor
timestamp: January 26, 2023, 01:12:27 pm
content: just started getting together my components to do the experiments in an old open university course on Radio frequency engineering (T527 / T327 no longer available) - and the first dilemma/decision is the aerial construction. The kit was not part of the course that I enrolled in, although the text indicates that this was at least the idea for students to have it - the kit would've had a ready made aerial.I have gotten a ferrite rod and wonder if I should make Litz wire for the aerial and wind as indicated over a bit of ptfe tape.Any thoughts?

author: wasedadoc
author_rank: Super Contributor
timestamp: January 26, 2023, 07:09:32 pm
content: That looks like a Medium Wave radio. (530-1600 kHz). Around 1965 I wound my own ferrite rod aerial. I used gummed parcel tape (is that still available?) to make a sleeve which was a tight fit on the rod but could be moved along it if desired. Wire was ordinary enamelled single core copper. Single layer of touching turns. I used sealing wax to secure the ends of the coil to the paper sleeve. A couple of Terry clips to hold the rod.BTW C7, 100pF looks a bit on the low side to me. 3k impedance at 530 kHz.

author: TimFox
author_rank: Super Contributor
timestamp: January 26, 2023, 08:55:48 pm
content: C7 = 100 pF is the filter capacitor for the half-wave peak detector using diode D1.A larger value might cause "failure-to-follow" distortion.

author: 807
author_rank: Frequent Contributor
timestamp: January 27, 2023, 01:09:15 pm
content: Fond memories of watching the Open University programmes in the 70's on BBC2 Saturday mornings. Most of it was way over my head in those days, but still fascinating to watch. Loved the opening fanfare.Are those courses still available online anywhere?Like wasedadoc, when I built my first crystal set radio, I used enamelled copper wire wound on a piece of paper wrapped around the ferrite rod. This allowed me to tweak the range I could tune to by sliding the windings along the rod. Used a "real" tuning capacitor in those days of course!

author: armandine2
author_rank: Frequent Contributor
timestamp: February 03, 2023, 07:33:08 am
content: I'm guessing the course isn't being taught anywhere now - it came up rarely when I searched for it online.However, the text Electronics of Radio, covers much the same ground:https://www.amazon.co.uk/Electronics-Radio-David-B-Rutledge/dp/0521646456for my experiments I'mstillwaiting for delivery of varactor diode - and have ordered Litz wire and 44AWG to try and make my own.Nothing happens quickly on my bench
Aerial wire- is it anything special - Page 1
Forum section: electronics / beginners

author: Skippy
author_rank: Contributor
timestamp: September 19, 2013, 07:52:07 pm
content: So this is a photo of an aerial I've got with some cheap HiFis.My question is that I want to make some more. Is there anything special about the wire, or is it just a piece of wire? Does the loop at the end serve any purpose?

author: Lightages
author_rank: Unknown
timestamp: September 19, 2013, 08:07:40 pm
content: For antennas, wire is wire is wire. Steel, copper, aluminum, does not make any difference in the performance. The only differences are cost, strength and corrosion resistance. Use whatever you have for the job. The loop is to hang the wire on something.

author: Kryoclasm
author_rank: Regular Contributor
timestamp: September 20, 2013, 12:27:40 am
content: You should to keep it the same length, that is important for the radio frequency range you will be receiving.That is assuming the manufacturer also put some thought into it.

author: Zero999
author_rank: Super Contributor
timestamp: September 20, 2013, 10:08:23 am
content: No, it's just a standard piece of copper wire. You can improve the performance by replacing it with a proper aerial designed for operation in the FM broadcast band.

author: Psi
author_rank: Super Contributor
timestamp: September 20, 2013, 10:18:04 am
content: The width of the antenna wire can be somewhat important as well, but not at FM radio freq.The 2.4/5.8Ghz cloverleafs i make for FPV are harder to build for a specific frequency when using thin wire. The response is sharper so there's less margin for error but if you get it right the performance is excellent.So the wire width is a trade off, easy-to-make vs good performance vs durability.
Aeroflex3500A radio integrated tester - Page 1
Forum section: electronics / beginners

author: Bendan
author_rank: Newbie
timestamp: September 14, 2019, 12:20:00 pm
content: 2 MHz - 1 GHz operationAM / FM transceiver testP25, NXDNTM and DMR digital test optionsThe spectrum analyzer's noise floor is below -136 dBmAudio oscilloscopeAntenna/cable testWeighs less than 8 pounds.Continuous use of 5 hours of battery life-20° to + 55°C operating temperature rangeRugged construction (humidity, height, shock and vibration specifications, MIL RF 28800F Class II certification)Combine the capabilities of a benchtop radio test set with the frequency domain reflectometer function; the Aeroflex 3500A Portable Radio Tester is a lightweight, rugged and versatile portable platform. The unit measures AM and FM radio transceivers on the workbench, vehicle or field.The Aeroflex 3500A Portable Radiocommunication Tester now includes an RF spectrum analyzer option that allows the user to accurately view the spectrum of the measured signal.The device provides the user with the opportunity to isolate the radio installation function from the fast drive through the test function. Frequency domain reflectometers help to isolate cable and antenna problems quickly and efficiently.
Afro icon - Page 1
Forum section: electronics / beginners

author: ez24
author_rank: Super Contributor
timestamp: August 11, 2015, 01:12:38 am
content: What does this icon mean? The name of it is Afro.O0Is it a degradation against bald guys like me? I do not know how or when to use it.

author: Unknown
author_rank: Unknown
timestamp: August 11, 2015, 03:12:02 am
content: It means you aspire to be as good as this guy(Robert Widlar)
Agilent 2000X Series DC measuring accuracy - Page 1
Forum section: electronics / beginners

author: KD0RC
author_rank: Regular Contributor
timestamp: March 24, 2014, 12:44:54 am
content: As I am learning about all of the features of my Agilent DSOX 2022A oscilloscope, I thought I would check its measurement of a linear power supply against my ExTech branded DMM with a Radio Shack model number (22-816). I don't know what the claimed accuracy of the meter is, but I thought it would beinteresting to see how it compared to the scope.The ExTech shows 13.48 VDC. So far so good... The scope, however, shows anywhere from 13.4 to 13.7 VDC depending on where on the screen it is.When I set the scope to 2 V/Div and move the trace so that it and the ground reference are both on the screen, I get 13.5 VDC which agrees with the DMM.When I set the scope to 10 V/Div and move the trace to the top, I get 13.4 VDC. Moving the trace to the bottom of the screen (keeping the gnd ref on screen) I get 13.7 VDC.The DMM function of the scope matches the measurement function.So is this just a case of using as much of the dynamic range of the scope as possible for the most accurate results? Why would the location on the screen cause different results?I also was wondering about DC RMS - like, what is it? I understand the concept of Root Mean Square of an AC signal, but what does it even mean to have an RMS measurement of a DC value? Then there is DC RMS full screen and DC RMS N Cycles. Is all of this RMS for DC about a non-stable or varying DC signal?
Agilent 54642D - Page 1
Forum section: electronics / beginners

author: Benji
author_rank: Newbie
timestamp: May 09, 2011, 12:46:45 pm
content: Hello everyone,I have a simple question:The mixed signal oscilloscope Agilent 54642D for 400€, you would buy it or not?Specs :http://www.home.agilent.com/agilent/product.jspx?nid=-536902796.536882124.00&lc=ita&cc=ITIt seems for me like a great deal but maybe a little too much. The alternate question would be: what is there to check the good working state of a second-hand oscilloscope?Thanks !

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: May 09, 2011, 12:50:45 pm
content: Yes that's a very good deal, as long as it's working.

author: EEVblog
author_rank: Unknown
timestamp: May 09, 2011, 12:55:09 pm
content: Are you kidding! at that price it's an absolute STEAL!A 500MHz 8M mixed signal Agilent scope for 400€ is an insanely low price.You could easily sell it for 5+ times that on ebay if you wanted too. Two units on ebay currently for over $6500AU which is a tad high. On first guess I wouldn't sell it for under $4000The 546xx series scopes are excellent.These scopes have built in self test. And pretty much if each channel works with the front panel cal signal then it should be fine.Dave.

author: Benji
author_rank: Newbie
timestamp: May 09, 2011, 01:01:48 pm
content: Great! Thank you both for your fast answer

author: tjw
author_rank: Contributor
timestamp: May 10, 2011, 12:27:12 am
content: Hi,note that there was a recall for 54642D's within a specific serial number range and the fix was to replace the system board. You will find a 'Service Note' on the Agilent website listing the serial numbers of the faulty units. Go to Oscilloscope support and search for 54642D.Are you able to check the serial number ? It will be on a label on the back of the case and is also accessible via the service menu - make sure they match.Regards, TJW.

author: Benji
author_rank: Newbie
timestamp: May 10, 2011, 08:07:13 am
content: Thanks!That's indeed very important information.
Agilent 93000 C200e using AM80A-300L-120F18 module - Page 1
Forum section: electronics / beginners

author: proshenn
author_rank: Newbie
timestamp: June 11, 2014, 05:16:29 am
content: HelloI have a customer service Agilent 93000 C200e using AM80A-300L-120F18 moduleBecause of the different module board can not be used, he was looking for AM80A-300L-120F18-T-T module hasI ask this question who touched? Replaced by this type of module models?
Agilent Branded Leads - Page 1
Forum section: electronics / beginners

author: Johnny10
author_rank: Frequent Contributor
timestamp: May 23, 2017, 11:12:02 pm
content: How do you tell if the eBay listings that state Agilent or Fluke are real?I am looking for a good set of leads for my 3457DMM and saw these listed but I have been burned quite often with Chinese junk being sent instead of what is advertised..http://www.ebay.com/itm/Agilent-34138-37904-Test-Lead-Set-for-Digital-Multimeter-Probe-Fluke-Keysight/132119652554?_trksid=p2047675.c100011.m1850&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D40130%26meid%3D6dc3e185e37a4c3c892264c816e35e5c%26pid%3D100011%26rk%3D1%26rkt%3D12%26sd%3D272675661019

author: Matir
author_rank: Contributor
timestamp: May 23, 2017, 11:14:48 pm
content: The best probes I've ever used have been from probemaster.com -- it's all they do (probes of various sorts), made in the USA, high quality. Buying from eBay -- well, it doesn't matter what it says or what the photo is, they can still send you junk.

author: rsjsouza
author_rank: Super Contributor
timestamp: May 24, 2017, 11:27:41 am
content: The probes received with my U1233A are very similar (not the other accessories) and they are good quality ones.

author: electr_peter
author_rank: Unknown
timestamp: May 24, 2017, 07:25:18 pm
content: Probes in eBay pictures look genuine. Packaging is very similar to what comes with new Agilent DMM in the box. I haven't seen those hook adapters, though, but they look okay to me.Probes are of good quality. My only issue with them is size - I would like them to a bit smaller and less bulky.
Agilent DSO 1102B - Page 1
Forum section: electronics / beginners

author: raymond2000
author_rank: Contributor
timestamp: July 02, 2013, 05:16:23 pm
content: hi was looking for an upgrade after departing from my HP 54600A digital oscilloscope, seen an Agilent DSO 1102B,compared to my previous scope, this one is superior and more modern, I want to know if there are other from your experience (good quality, I mean stable) scopes with same specs, I want to compare specs and prices in the same rangehereare the spec for Agilent DDSO 1102B* it is just for a hobbyist bench, 100mhz ,2 channels scopeThank you for your input

author: rolycat
author_rank: Super Contributor
timestamp: July 02, 2013, 06:00:52 pm
content: As many here will tell you, the Rigol DS2000 series scopes are superior in practically every respect to that Agilent, which is itself a rebadged Rigol. Some of Dave's blogs feature the DS2000, and Mark Madell (marmad on this forum) has done a video review and a lot of work to support it.The DS2072 is around the same price as the DSO1102B, although it only has 70MHz bandwidth. The 100MHz DS2102 is a bit pricier.

author: Todd
author_rank: Contributor
timestamp: July 02, 2013, 06:05:10 pm
content: That scope is out of date and very expensive for what you get. A Rigol DS2102 retails for $1143 and is far superior.

author: bingo600
author_rank: Super Contributor
timestamp: July 02, 2013, 06:19:30 pm
content: Isn't the one mentioned , the same as a Rigol 1102Ehttp://www.batronix.com/shop/oscilloscopes/Rigol-DS1102E.htmlThe Rigil is prob. a lot cheaper/Bingo

author: Unknown
author_rank: Unknown
timestamp: July 02, 2013, 07:35:38 pm
content: Not the 1000E series, I think it's either the Rigol 1000B or 1000CA series. Either way, not good value for your money unless you value Agilent service and support, and even then it's poor value compared to the Agilent X2000 series.
Agilent DSO 3202A: DC Voltage Measurement Issue - Page 1
Forum section: electronics / beginners

author: BulkHailing
author_rank: Newbie
timestamp: May 25, 2024, 08:07:12 am
content: Hi all!I recently bought used Agilent DSO 3202A scope and I’m trying to familiarize myself with the device, so I started with a simple measurements. The self-testing works well, and also measuring wave signal from the function generator also gives the expected result:However when I measure direct DC voltage from the power supply, i don’t understand the results. I expect the line to rise up to the point of the voltage value and stay there fixed like in this videohttps://www.youtube.com/watch?v=lhFTKEPhdnM.When I touch the power supply output, the measurement “jumps” to the voltage level for a fraction of second, and then goes back to the center:Also the same happens when I adjust the DC offset of the waveform on the function generator - the signal does not "move" up or down on the screen, it "jumps" and goes back to the center.I performed factory reset to the scope, and i tried to change the coupling settings of the channel 1, but nothing seems to help.Please help!

author: Alex Nikitin
author_rank: Super Contributor
timestamp: May 25, 2024, 10:09:10 am
content: Hi and welcome to the forum!If you are getting the same results in both channels, I would suspect the probe you are using first of all. Do you have another probe? Try to use just a piece of a wire between the test signal output and the input , the test signal is 0 to +3V .CheersAlex

author: BulkHailing
author_rank: Newbie
timestamp: May 25, 2024, 10:39:18 am
content: Yes, I tried to use different channels and I connected it through a wire also, the result is the same.Test signal gives a square wave as expected, I have a problem only when I try to measure DC voltage. The scope seems to "react" to the change in the voltage, but it seems to be in some kind of mode when it only reflect change in the voltage, and does not measure the absolute value of the voltage, does this make sense?..

author: Alex Nikitin
author_rank: Super Contributor
timestamp: May 25, 2024, 11:10:11 am
content: Check if you have a digital filter engaged.CheersAlex

author: BennoG
author_rank: Frequent Contributor
timestamp: May 25, 2024, 11:13:39 am
content: looks like the scope is locked in AC coupling.do you hear relay's clicking when you switch from AC / DC coupling ?Benno

author: BulkHailing
author_rank: Newbie
timestamp: May 25, 2024, 12:28:00 pm
content: No, I don't hear relay switching when I change the coupling from DC to AC. Is there a way to unlock it?

author: Alex Nikitin
author_rank: Super Contributor
timestamp: May 25, 2024, 01:04:04 pm
content: On these scopes there is no relay click going from DC to AC coupling and back (I have the 60 MHz version, DSO3062A in my lab and it doesn't click) . It does look however like there is a fault in that area as the waveforms are consistent with the AC coupling engaged.CheersAlex
Agilent E3611A Problem or Not? - Page 1
Forum section: electronics / beginners

author: jamesp15
author_rank: Regular Contributor
timestamp: July 26, 2012, 10:48:37 pm
content: I recently came across a brand new E3611A power supply (was a gift) and have noticed that the front panel display meters are "off" by as much as 0.14v is this within spec of this unit? or should I contact Agilent about this?The unit is brand new in a never opened box, but the cal date on the certificate that came with it says it was calibrated in June 2011, so it must have sat in a warehouse for over a year. I have the reciept for it and it was bought new from an "authorized" Agilent dealer.My only prior experience with power supplies (a Mastech HY3005F-3 and a BK Precision 1627A) they were both spot on.See attached pics.Oops I meant to put this in the Product Reviews, Photo's and Discussion forum, can a mod move it there if this forum isnt right for this question?

author: JuiceKing
author_rank: Regular Contributor
timestamp: July 26, 2012, 11:10:54 pm
content: Quote from: jamesp15 on July 26, 2012, 10:48:37 pmIf the E3611A is like the E3610A, it's very easy to make this adjustment yourself. You need to find an on-line copy of the service manual and follow the steps to align the voltmeter in your supply with your reference. The service manual will also tell you if the discrepancy you see is within spec or not. It's pretty close, I think.

author: free_electron
author_rank: Super Contributor
timestamp: July 27, 2012, 06:13:32 am
content: Quote from: jamesp15 on July 26, 2012, 10:48:37 pmlooks in spec to me.the meters in these machines are 3 digits only. such meters are typically +/- 1lsb.so 1.5 could be 1.6 or 1.4. The convertor simply has no more resolution than that and it is allowed to be off 1 lsb.0.395 will show as 0.3 as the convertor does not 'see' the 0.095 . It's as simple as that.

author: billclay
author_rank: Regular Contributor
timestamp: July 30, 2012, 09:52:45 pm
content: Looks "normal" to me. The E36XX that I have are about the same with the meter.Hey, that's why you have a nice multimeter, so you can measure your power supply voltage!
Agilent E3631 PSU - current sensing - Page 1
Forum section: electronics / beginners

author: FullBridgeRectumfire
author_rank: Newbie
timestamp: May 08, 2017, 05:44:27 pm
content: Hi all!I've been comparing various lab PSUs circuit diagrams and I came across this schematic from Agilent. Main principals of operation are more or less the same as in any other standard PSU, but I'm confused about the current sensing circuit. My question is how does the opamp (U26A) knows the voltage drop across a shunt resistor R66?+25V_I_MON goes also to ADC, but i think that it's just for displaying current.Full service manual

author: jeroen79
author_rank: Frequent Contributor
timestamp: May 08, 2017, 10:27:20 pm
content: Resistor R66 (and R67 likewise) is connected on one end to the common terminal.This terminal also is the analog 'ground'.So R66 provides a voltage relative to 'ground' proportional to the current.This voltage is sensed by the current ADC for the display.The CC opamp compares it to the CC reference (provided by the DAC) and will attempt to keep both the same.
Agilent E3631A - EMF shielding - Page 1
Forum section: electronics / beginners

author: Personwithhats
author_rank: Contributor
timestamp: August 15, 2023, 02:10:24 am
content: Hello again,I'm currently using a Agilent E3631A power supply just for some basic stepper motor tuning (drawing about 5V and 1.3A)At one point I had the motor moving despite no signal being sent - turns out the Agilent was releasing a strong enough magnetic field to move the motor......I switched to the blue PSU, less EMF, good enough for this test but it makes an annoying whine so I'd like to stop using it.I'm not sure what I can do with the PSU to improve its shielding? Something else I'm doing wrong?For comparison nothing else on the table is emitting any fields worth noting.(btw I know breadboard isn't the best for low EMF but it is working good enough with the other PSU)
Agilent E3648A DC power supply RS232 communication - Page 1
Forum section: electronics / beginners

author: jainchen
author_rank: Newbie
timestamp: May 04, 2022, 10:46:17 pm
content: Hi,With RS232 port, I need to write PC software to set Agilent E3648A DC power supply voltage to 24V, then read back the current draw when I connect to a PCB board.Can I use Docklight to write script to do that? Or I need to use a specific software provided by Agilent? I cannot find relevant information to get started.Thanks a lot!

author: Venturi962
author_rank: Regular Contributor
timestamp: May 05, 2022, 01:38:40 am
content: Try Python + PyVISA + PyVISA-Py:https://pyvisa.readthedocs.io/en/latest/https://pyvisa.readthedocs.io/projects/pyvisa-py/en/latest/installation.htmlTo use RS-232 on this PSU, you'll need a Null Modem adapter as well.

author: pigrew
author_rank: Frequent Contributor
timestamp: May 05, 2022, 02:47:34 am
content: You can use whatever software you would like that can read or write to the serial port. The "simplest" test would be to use something like putty or teraterm or hyperterminal, and type commands by hand. The E3648A uses a human-readable command protocol called SCPI.The commands to use are documented in the user's guide of the power supply, and are things like "VOLT 0.5" or "MEASURE:CURRENT?".The instruments are generally designed to be used through GPIB which has special interface commands to read status bytes, or send triggers, but the RS232 interface should be able to do nearly everything the GPIB interface can.The baud rate can be set between 300 and 9600 baud (9600 8N2 should be the default) through the front-panel. (Note this is 2 stop bits, not the normal 1).You can send a CTRL-C to the instrument to clear the RS232 interface.You can then use your language of choice to communicate with the instrument (C#, python, etc). You can either use a native windows serial port library, or you could setup your intrument through "VISA". If you use VISA, then it would be easier to transition to GPIB control in the future, but wouldn't really give you an advantage at the moment with only a single instrument.There is one more warning:Do not use the RS-232 interface if you have configured the power supply tooutput relay control signals. Internal components on the RS-232 circuitry maybe damaged.Looking at its website, Docklight probably would work, but I've never used it myself.
Agilent help for beginners / students - Page 1
Forum section: electronics / beginners

author: jh
author_rank: Newbie
timestamp: July 04, 2010, 05:33:17 pm
content: Agilent emailed this link to me last week.It is detailed to their brand, but the concepts are generic.For those wanting to know, how do I....http://www.home.agilent.com/agilent/editorial.jspx?action=download&cc=US&lc=eng&ckey=895899&nid=-34944.0.00&id=895899

author: chscholz
author_rank: Regular Contributor
timestamp: July 04, 2010, 06:10:27 pm
content: Thanks JH,Yes, the major scope manufactures spend a quite a bit of resources in providing tutorials, application notes, white papers, seminars, on-site training, etc.Check out ourEduPack.Chris
Agilent PSU - Page 1
Forum section: electronics / beginners

author: kvez
author_rank: Newbie
timestamp: December 10, 2024, 10:04:17 pm
content: Hello,I have two Agilent E3644A power supplies, and I’ve observed an interesting with their output voltage. As shown in the attached image, the output voltage fluctuates in a step way. I don’t think this is a fault, as both units exhibit the exact same behavior.I’m curious to understand what might be causing this. Both devices are stable and function perfectly otherwise. Recently, I acquired an E3632A unit (with the newer Keysight branding), and it does not show this behavior.The attached image compares one of the E3644A units with the E3632A.
Agilent Technologies DC Power Supply Handbook - Page 1
Forum section: electronics / beginners

author: Stephen Hill
author_rank: Regular Contributor
timestamp: July 26, 2012, 10:45:20 am
content: Last night I happened to come across this Agilent document when searching for power supply schematics and I must say it's a very good read.If you have an interest in power supplies and/or want to know more about their design, functionality and performance, then this is definitely worth a read.http://www.ieeta.pt/~alex/docs/ApplicationNotes/DC%20Power%20Supply%20Handbook.pdfThe main topics covered are:Terminology DefinitionsPrinciples of OperationAC and Load ConnectionsRemote ProgrammingOutput Voltage and Current RatingsPerformance MeasurementsEnjoy

author: Stephen Hill
author_rank: Regular Contributor
timestamp: July 26, 2012, 11:18:30 am
content: Just found an original scan of the hand book, written by Hewlett Packard:http://cp.literature.agilent.com/litweb/pdf/5952-4020.pdf

author: EEVblog
author_rank: Unknown
timestamp: July 26, 2012, 12:35:34 pm
content: I have the printed version. Yes, well worth the read.Dave.
Agilent U1250 Series - Page 1
Forum section: electronics / beginners

author: abdullahseba
author_rank: Frequent Contributor
timestamp: April 10, 2014, 09:14:53 am
content: what is the difference between the Agilent U1252B & the Agilent U1253B & why is the Agilent U1252B expensiver in rs components

author: Wytnucls
author_rank: Super Contributor
timestamp: April 10, 2014, 11:09:57 am
content: U1253B has an OLED screen and an 8 hour battery life, otherwise it is the same as the 52B model. It costs 386 GBP on RS Components without official calibration.U1252B costs 355 GBP without official calibration, also on RS Components.Some extra minor differences:COMMON MODE REJECTION RATIO (CMRR)U1251B/U1252B: >90 dB at DC, 50/60 Hz ± 0.1%(1 kW unbalanced)U1253B: >100 dB at DC, 50/60 Hz ± 0.1% (1 kW unbalanced)NORMAL MODE REJECTION RATIO (NMRR)U1251B/U1252B: >60 dB at DC, 50/60 Hz ± 0.1%U1253B: >90 dB at DC, 50/60 Hz ± 0.1%

author: nanofrog
author_rank: Super Contributor
timestamp: April 10, 2014, 08:30:31 pm
content: If you're not aware, OLED has a shorter lifespan than LCD thus far.So between that and the battery life, I bought the U1252B instead. FWIW, if you're concerned about battery life, get a separate charger and a couple of spare LSD NiMH batteries (this way you're covered if you're in the middle of something and the installed battery goes flat/getting close to giving false readings).Hope this helps.

author: abdullahseba
author_rank: Frequent Contributor
timestamp: April 13, 2014, 09:23:07 am
content: Quote from: Wytnucls on April 10, 2014, 11:09:57 amthank you
Agilent U8031A TRIPLE OUTPUT POWER SUPPLY - Page 1
Forum section: electronics / beginners

author: isaacsong23
author_rank: Contributor
timestamp: March 31, 2017, 03:57:54 pm
content: Hi guys, is this bench supply good? I have my uncle who will be giving one to me for free, he has it for 2years now and intends to hand it to me, wanna ask the EEE bros here for anyone who actually owns one or what they think of it! Thanks!!

author: slurry
author_rank: Regular Contributor
timestamp: March 31, 2017, 04:06:34 pm
content: If i had an uncle giving me that kind of qualitygear i would be happy.Keep it and use it, never get rid of a good quality power supply.
Agilent/Keysight E3644A Fan Broken? - Page 1
Forum section: electronics / beginners

author: Hendrik
author_rank: Contributor
timestamp: January 02, 2023, 08:07:18 pm
content: Hello,I have bought an used Agilent/Keysight E3644A and altough I have no reference (I know that some of these supplys can get loud) I would think that the cooling fan makes more noise than it should.A quick example with my chinesium dc load (sounds worse in person):https://streamable.com/7n6ml2Anyone with experience in replacing this fan?Kind regardsHendrik

author: Hendrik
author_rank: Contributor
timestamp: January 03, 2023, 11:31:41 am
content: For anyone interested here is the fan used in the power supply:And a soundcheck running outside the case at 12V:https://streamable.com/2pefd5

author: HighVoltage
author_rank: Super Contributor
timestamp: January 03, 2023, 12:58:03 pm
content: Agilent / Keysight never really had the best fan solutions in their power supplies or even other instruments.Over the years, I have replaced almost all Keysight fans. In some Agilent instruments I have added a 10 Ohm series resistor with the fan, to slow them slightly down and still have enough airflow. The noise level is definitely reduced significantly with this mod on some instruments.
agilient U1253B were to buy - Page 1
Forum section: electronics / beginners

author: insomniaaaaa
author_rank: Newbie
timestamp: May 02, 2011, 12:50:11 pm
content: hi looking to buy a new multimieter just wondering were can the above meter be bought or is there any good meters on sale

author: orbiter
author_rank: Frequent Contributor
timestamp: May 02, 2011, 03:03:54 pm
content: If in the UK you can get the 1253B here....http://uk.farnell.com/agilent-technologies/u1253b/multimeter-handheld-oled-display/dp/1780327?Ntt=u1253bhttp://uk.rs-online.com/web/6997367.html

author: EccentricRuss
author_rank: Newbie
timestamp: May 02, 2011, 06:11:41 pm
content: Insomnia,If you don't mind the blue model, U1253A, you can get it at MetricTest. They had it on sale a few weeks back with a 10% discount because it appears they are going to stock the B version and no longer the A. The blue seems a more aesthetic color, but if you definitely want the B model, MetricTest has it as well.http://www.metrictest.com/product_info.jsp?mfgmdl=HPU1253A(N)Cheers!EccRuss

author: saturation
author_rank: Super Contributor
timestamp: May 09, 2011, 08:19:53 pm
content: Just know about 1 month ago the 125xa series was on sale at grainger.com for $130-140.
AHRS sensor (IMU) for outdoor antenna - Page 1
Forum section: electronics / beginners

author: Tantalum
author_rank: Regular Contributor
timestamp: March 11, 2023, 11:54:25 am
content: HelloI have a high directional 4G outdoor dish antenna, and I wanted to fix it on a Diseqc motor to make it rotate horizontally (~150°) and perhaps also add a small linear actuator to optimize the vertical inclination (+/-20°).But I wanted also to add an IMU in order to get information about the orientation of the antenna.A +/-2° accuracy is good enough.Actually, I only need the geographical orientation (like a compass) and possibly the vertical inclination.Now I have following questions:1. Do I need a full AHRS sensor (= accelerometer + gyroscope + magnetometer + fusion algorithm) or a magnetometer is enough? Does the accelerometer/gyroscope/magnetometer data adds accuracy to the calculated geographical heading of the fusion algorithm?2. Since the antenna will only be able to move (slowly) 150°H and 20°V I won’t be able to calibrate the sensors after every power-up of the device. Is that an issue with such device? Is a one-time calibration (before final mounting) good enough?3. Is this Chinese AHRS (based on a RM3100 magnetometer, which has 3 external coil antennas) module overkill? Or is a BNO055 good enough for my purposes?Chinese AHRS (HWT901B-RS485):https://www.aliexpress.com/item/1005002977359131.htmlInside:The mag sensor inside:Alternative, the Bosch BNO055 with integrated fusion algorithm:Thank you for your help
aim-tti cap - Page 1
Forum section: electronics / beginners

author: orso
author_rank: Newbie
timestamp: November 25, 2017, 09:39:23 pm
content: Part number: 23620-0257Description: CAP 2U2K 100V P/E P22.5POSITION: C9, C10On the top of the cap they printed:2.2K100V368L0830My assumptions:2200uF100VDistans between pins 22.5 mmmade week 30 year 2008But what kind of cap is it?What does 368L stands for?

author: dmills
author_rank: Super Contributor
timestamp: November 25, 2017, 10:23:15 pm
content: Try 2.2uF 100V and it is a film type.Regards, Dan.

author: Andreas
author_rank: Super Contributor
timestamp: November 26, 2017, 06:11:14 am
content: most probably 10% = K tolerance

author: Benta
author_rank: Super Contributor
timestamp: November 26, 2017, 12:00:40 pm
content: Yep, 2.2 uF, 100 V, polyethylene.

author: fcb
author_rank: Super Contributor
timestamp: November 27, 2017, 11:14:28 pm
content: Try emailing TTI service department - they are really helpful.
air pressure sensor - Page 1
Forum section: electronics / beginners

author: Swake
author_rank: Frequent Contributor
timestamp: September 10, 2014, 12:34:51 pm
content: Looking for a cheap and easy to implement pneumatic pressure sensor to fit on an large air compressor.Measurement range of approximately 2 to 10bar (+ - 150psi) and capable of supporting at least 12 to 14 bar (+/- 175 to 210psi) without exploding.Digital or analog output, it doesn't matter as it will be connected to an arduino or similar.Anyone tips for a good sensor?

author: Swake
author_rank: Frequent Contributor
timestamp: September 11, 2014, 01:56:27 pm
content: Really no advice for this?I hope not being the first on earth doing something like this :-)

author: Richard Crowley
author_rank: Super Contributor
timestamp: September 11, 2014, 02:15:11 pm
content: I see automotive transducers on eBay for around $25. For eample...http://www.ebay.com/itm/Pressure-transducer-or-sender-150-psi-stainless-steel-for-oil-fuel-air-water-/251362960044

author: Kjelt
author_rank: Super Contributor
timestamp: September 11, 2014, 02:48:29 pm
content: Festo has some:http://www.festo.com/cms/nl-be_be/9711.htm

author: jlmoon
author_rank: Unknown
timestamp: September 11, 2014, 09:29:19 pm
content: How about :http://noel.feld.cvut.cz/hw/motorola/books/sg73/pdf/5_9sensor_msg.pdfMPX5999D comes to mind, but 150p.s.i. max, span of 4.5V

author: Swake
author_rank: Frequent Contributor
timestamp: September 12, 2014, 08:10:05 am
content: YES! Thank you :-)'Pressure transducer' is the right name. With this information it is much easier to find the right component of course.An automotive version it will be. As in the link of Richard. Best solution because easy to fit on the existing tubing. I will choose for an 200psi version. Gives some more headroom for over-pressure.
Air purifier stops working after cleaning - Page 1
Forum section: electronics / beginners

author: thomwo
author_rank: Newbie
timestamp: April 19, 2021, 09:17:08 am
content: Hi,I bought a rensair air purifier recently which it think is best for viruses. it works fine but today i plan to clean it up, after clean up when i switch on it fails. what could be the reason?

author: Simon
author_rank: Unknown
timestamp: April 19, 2021, 11:43:12 am
content: If it's that recent return it.

author: BILLPOD
author_rank: Frequent Contributor
timestamp: April 19, 2021, 01:40:33 pm
content: Good Morning Thomwo, IF you removed the filters, go back and check their orientation. The filters on mine, (different brand),have electrical contacts that have to mate up with other contactsin the machine. So, If I don't install the filters in the EXACTposition, it won't run. RTFM

author: thomwo
author_rank: Newbie
timestamp: April 20, 2021, 10:42:52 am
content: Thank you. @SimonI checked the purchase date, only 2 days are remaining for warranty expiry. I will definitely return it. My selection was wrong, i choose rensair from the 4 other brands.Which one i should buy that is really best for home use/1. Levoit (https://levoit.com/)2. Rensair (https://topbestairpurifiers.com/rensair-air-purifier-reviews/) i was impressed from this review on facebook because they claim it is hospital grade and work best for ooronavirus - (I'm disappointed)3. Alen Breathe (https://alen.com/products/alen-breathesmart-hepa-air-purifier)4 HoneyWell (https://www.honeywellstore.com/store/category/air-purifiers.htm)

author: thomwo
author_rank: Newbie
timestamp: April 20, 2021, 10:45:48 am
content: @BILLPOD Actually i tried to reinstall the filter, but same.

author: SmokedComponent
author_rank: Regular Contributor
timestamp: April 20, 2021, 01:20:08 pm
content: Quote from: BILLPOD on April 19, 2021, 01:40:33 pmI found out that the funny way. I accidentally kicked mine over and it stopped working. Great... Naturally, I took it apart... and noticed there's a switch by the filter module and the filter just came loose a bit. Pushing it back solved the problem.... so I took apart a mundane device with many screws for no reason.
AiThinker A6 GSM modem. Sound problems - Page 1
Forum section: electronics / beginners

author: Ivanum
author_rank: Newbie
timestamp: June 16, 2018, 02:35:14 pm
content: Hello guys! I apologize in advance for my English, but local fellas can't help me, so i asking here.Recently i bought an AiThinker A6 GSM modem for my rotary dial phone upgrade project. Unlike most users of this module, i whant to use it for voice calls (most people use it for GPRS transmisions. In the most part, thats why i cant find any interesting info for my question).Anyway, when i hooked up a headset i found a problem: my phonecall opponent hear me pretty clear and loud (not best sound quality, but exeptable), but his voice in my ear sounds wavy or intermittently. But, if opponent talks loud enouht (or blow in his mic), wavy effect in my ear disapear for a while (10 seconds, or something) or until opponent start to talking normally again. I thought that is a gain problem inside a modem. In AT commands (http://alselectro.com/files/A6-AT-Commands.pdf) for this module i found a gain control commands AT+VGR for speaker and AT+VGT for mic, but ajusting them just make all sound with wavy effect louder or quieter.Also, i found a way for switching between headset out and loudspeaker out on modem (AT+SNFS=0 or AT+SNFS=1), but wavy effect was in a both ways.Then i thought that effect appear, becouse of weak GSM signal, but there is a AT command AT+CSQ, that shows that signal is a -59db, that is very good.Some guy online shows, how he starts up this modem from scratch (his scheme in attachments)/ He used pretty complex connection of mic and speaker. I have a module (on a photo), but i can't find a scheme of it, so i dont know, how microphone and speakers outs are made on it.So can you help me with this? may be there is a command, that switches off some gain function, or maybe i can elliminate it some how? Or this is not worth any work, and i must buy another one?
Aixun T400 or T420D - Page 1
Forum section: electronics / beginners

author: u666sa
author_rank: Frequent Contributor
timestamp: March 07, 2025, 12:57:51 pm
content: The time has come for me to purchase a soldering station. Now T400 is out. My plan was T420D with 3 handles.At this point I'm confused, man.Which one should I get, the T420D or T400?

author: u666sa
author_rank: Frequent Contributor
timestamp: March 07, 2025, 05:57:10 pm
content: I'm leaning toward T420D. Sway me toward T400.

author: thm_w
author_rank: Super Contributor
timestamp: March 08, 2025, 12:38:13 am
content: If you want AI voice control, gyro control, buttons on your iron handle, and docking station I guess. All of those sound incredibly dumb to me, but they might come out with an actually useful peripheral in the future. Maybe.

author: u666sa
author_rank: Frequent Contributor
timestamp: March 08, 2025, 10:34:28 am
content: @thm_wwhat I want is a whole bunch of tips, highly available, and cheap -- just like T12/WQ. I did not see the tips for this handle, they suppose to be released. But I'm expecting just one manufacturer Aixun and will they be all that. This is why I'm leaning toward T420D. 3 handles, lots of tips, pretty good.If I know that you can attach to T400 handles from T420D, I'd go ahead and buy it. But there is no such information at this point.Is there such information?

author: CaptainBucko
author_rank: Regular Contributor
timestamp: March 09, 2025, 09:56:45 am
content: I have the T420D. It’s an awesome bit of kit. I use both Aixun and JBC tips. You won’t regret it.

author: u666sa
author_rank: Frequent Contributor
timestamp: March 09, 2025, 12:16:00 pm
content: Quote from: CaptainBucko on March 09, 2025, 09:56:45 amYep, getting it. Also the Aixun H314 hot air.I saw an Aixun handle on aliexpress for T12 tips. Assuming it won't work with T420D, but there isn't a reason to begin with. However, would be nice to get it and try making it work.

author: thm_w
author_rank: Super Contributor
timestamp: March 10, 2025, 09:29:58 pm
content: Quote from: u666sa on March 09, 2025, 12:16:00 pmThere is no point to this when T245 tips are <$3 each.There is nowhere on there website that even claims it to be supported:https://www.aixuntech.com/product/t420d-200w-dual-channel-electronics-soldering-station-with-t245-handle/
Akai x-360d Capacitors - Page 1
Forum section: electronics / beginners

author: aleigh0435
author_rank: Newbie
timestamp: October 15, 2023, 11:26:26 pm
content: Hi, I'm Alicia. I'm new, I have a x-360ds that needs parts replaced. I need to know the exact size capacitor, preferably new. I'm thinking two capacitors, one 2uf 250v and the other 3uf also 250v I think, but I don't know. Please forgive my ignorance, as I said, I am new to all of this.

author: TimFox
author_rank: Super Contributor
timestamp: October 15, 2023, 11:38:03 pm
content: Here is a service manual for that unit:https://usermanual.wiki/Document/X360D.2366569966/htmlSee pp 47 ff for replacement electronic parts list.Which parts do you need?Taking a quick glance, I noticed some "metalized paper" capacitors of roughly that value: I would replace them with more modern "metalized polypropylene" capacitors of the same or higher voltage rating.If you can find the part(s) in question on the circuit board layout, you should be able to estimate the dimensions.

author: aleigh0435
author_rank: Newbie
timestamp: October 16, 2023, 12:53:39 am
content: Thank you so much. I found my answer in the manual you sent me.

author: floobydust
author_rank: Super Contributor
timestamp: October 16, 2023, 02:01:04 am
content: You got quite the beast. You would need to measure diameter of the old caps and find new ones that fit. I saw blue ones, plastic cans from RS.This is for the main motor run capacitors? The two big ones in the middle of the pic?It's a multi-section cap that is switched "cycle change" SW-214, SW-215 to select mains frequency. Desired total 3uF for 50Hz mains or 2uF for 60Hz.C101a section 1 is 2uF, C101b section 2 is 1uF 250WV metallized paper capacitor for main motor, RD-2027 on Resistor Block RD-1900Schematic shows:C201a 1.5uF, C201b 3.5uF 250WVC202a 1.5uF, C202b 3.5uF 250WVAkai X-360, X-360D, X-360DS Service Manualmore here:https://www.antiqueradios.com/forums/viewtopic.php?f=13&t=356613
Alarm Clock, Can't Set Alarm Time, Cause of Error? - Page 1
Forum section: electronics / beginners

author: Shutout
author_rank: Newbie
timestamp: February 20, 2014, 01:34:13 am
content: So a guy at work brought me his old school alarm clock to see if I could fix it.Here is a picture:It is a GE General Electric Wake System 7-4687-A Vintage AM FM Weather TV Green LED Teak (according to a description on ebay).It works fine, except for one part. You can adjust the time by hitting the time button, and then moving the time up or down with an up button or down button. However, when I hit the wake button and the mode switches to wake, the Wake Time will not adjust. Nothing happens. The interesting thing is when I go back to Time to adjust the Time, it also changes the Wake Time.Any ideas as to why this might be happening?

author: Skimask
author_rank: Super Contributor
timestamp: February 20, 2014, 04:25:11 am
content: |OSwitch is loose

author: SeanB
author_rank: Super Contributor
timestamp: February 20, 2014, 04:53:44 am
content: Sticking button, or leaky diodes inside on the main board. Open it, see which clock chip it uses then look up the datasheet and you will get the circuit layout. Then look for the switches and diodes and test them.
Alarm Flashing Led Question! - Page 1
Forum section: electronics / beginners

author: ryan1988
author_rank: Newbie
timestamp: June 19, 2014, 02:32:50 pm
content: Hi Guys,Bare with me, I'm starting to look into electronics coming from an IT software background.I recently wanted to "Jazz up" my bell box on the house external wall with a blue flashing led from eBay. The only details given by the seller was that it was 12V and had an inline resistor which I notice gets rather hot when connected to the 12V battery so...I have since connected this to the bell box 13V power supply and it is going well. I also connected a 0.6w 47ohm resistor to it in series because I thought this would possibly stop the LED burning out and it was the only resistor I had going spare. My question is, is this okay to do and will this run perfectly well. The bell box is getting the 13v supply from the wired control panel in the cloakroom. From what I can tell it seems the LED is going just as well as before but it somehow feels less hot with using the resistor.I had the spare 47ohm resistor from fixing my alarm panel previously.I look forward to your guidance and advice.

author: VK5RC
author_rank: Unknown
timestamp: June 19, 2014, 11:20:56 pm
content: Do you have a Multimeter to measure the current drawn? Then you can calculate the power dissipation= I^2.R.

author: Lee697
author_rank: Regular Contributor
timestamp: June 20, 2014, 08:26:19 am
content: Are you saying you have 47ohm resistor in series with the blue LED, across 13V?If so - that would be approx 10V across the resistor - for give or take 212mA - thats a lot for the LED, and for the resistor too.... probably why it is getting hot....

author: Psi
author_rank: Super Contributor
timestamp: June 20, 2014, 09:12:08 am
content: Quote from: Lee697 on June 20, 2014, 08:26:19 amAccording to his post the LED is one of those versions with a built in resistor, probably 470R for 20mA 12V and 3V ledAssuming his led is a 20mA kind then 47ohms is pretty much perfect for getting rid of the excess 1 volt in a 13V supply.0.02A * 47ohms = 0.94V. so 13v becomes 12.06v to led package.

author: jlmoon
author_rank: Unknown
timestamp: June 20, 2014, 04:04:34 pm
content: QuoteAssuming the "13V bell box supply" is a measured value and not a stamped value on a label. If it is a bell transformer -such as a door bell xfmr.. I would venture to guess it could be up to 18 - 20 volts output unregulated, which changes the game entirely.

author: Towger
author_rank: Super Contributor
timestamp: June 20, 2014, 04:27:31 pm
content: I assume the 13v supply is the actual voltage from the panel 12v supply to power the bell box's battery and PIRs etc.