hybridfree/eevblog-posts huggingface dataset:
Zentech. Chenwah - Page 1
Forum section: electronics / testgear

author: wd5jfr
author_rank: Regular Contributor
timestamp: October 15, 2020, 10:07:35 pm
content: Was at the local used place yesterday and some nice looking Kelvin clamp stuff I've never seen before. Price seem high but I've nothing to justify saying that other than my DE-5000 for a little over a $100.00Hank

author: Vgkid
author_rank: Super Contributor
timestamp: October 16, 2020, 06:56:14 am
content: Specs on the milliohm meter:https://img2.fr-trading.com/0/3_184_110517_502_538.jpg.webpIt looks like an older tonghui lcr meter, but I can't find anything on it, if it works, price is reasonable.The chenhwa 1012 I can only find this little bit of info on it:www.ietlabs.com/pdf/GenRad_History/HenryHall/HistoryImpedanceMeasurements/AppendixC.pdThe 1061a doesn't look bad at all.www.usedline.com/Specs_URL/40/2140.pdf

author: coromonadalix
author_rank: Super Contributor
timestamp: October 16, 2020, 10:38:47 am
content: Some of theses lcr meters are made with old parts, old cpld's etc ... i had one in the past and ditched it, absolutely no schematics can be found or be orderedSome of theses lcr, can or could go to 200khz thats alll, and the "used" prices are way too highjust buy an DE-5000 loll
USA Amazon Prime Day -15% on Siglent test gear - Page 1
Forum section: electronics / testgear

author: uski
author_rank: Frequent Contributor
timestamp: October 13, 2020, 02:10:51 pm
content: Hi Deal is overAmazon has -15% on some Siglent test gear for Prime Day :link2 channel oscilloscope SDS1202X-E4 channel oscilloscope SDS1104X-ESDM3055 5.5 digit multimeterArbitrary function generator...
Ball Efratom PC-10 (Portable clock) manual searching - Page 1
Forum section: electronics / testgear

author: 3g57
author_rank: Regular Contributor
timestamp: October 13, 2020, 01:15:52 pm
content: Hi there,I need an Operation manual or any information for the Ball Efratom PC-10.I can upload boards photos and calibration methods, ask me for that.Thanks for help
HP/Agilent Encoder   - Page 1
Forum section: electronics / testgear

author: lucatz
author_rank: Contributor
timestamp: October 14, 2020, 12:47:39 pm
content: Hi All,I have recently purchased a HP 6642a PSU. The unit has a broken Encoder. I see that the unit i purchased uses the old 5 PIN encoders which I believe to be HP Part :0960-0822/QRPG-A494. The Encoder has been discontinued and can be purchased as NOS stock once and a while. But was wondering if newer versions such as HRPG-AS32 or even HRPG-AD32 would fit the bill. But to be sure I would need to get a datasheet of the QRPG-Axxx to be sure. I have not found anythingMy research so far leads me to believe that the QRPG is 7V and uses an actual bulb and the HRPG is 5V with LED. Simple divider can fix that but pulse width and other parameters still need to be validated.Then again HP/Agilent have smarter people on board and would not have replaced the whole front assembly if they could have done what I think is possible. Plus its 1200USDThanks allLuca

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: October 14, 2020, 06:56:25 pm
content: I will pull out a 66xx to check what I actually installed to replace the -A494, but I believe I used an HRPG-ASCA-17R or -19R as a reasonable & vaguely economical replacement. I think there was also comparable Grayhill encoder. The -A494 is 120CPR and the -AS32 is a 32CPR (for a different rev of the control panel). One thing to pay attention to is the shaft design and length. The HRPG-ASCA-17R has a shorter metal shaft, but enough length to grap the cap. You can graft on a extension if you are feeling creative.

author: lucatz
author_rank: Contributor
timestamp: October 14, 2020, 08:07:28 pm
content: Thank you ChuckDarwin,If you used HRPG-ASCA variant then I guess the QRPG is very similar including voltage etc...if you have a min to take a look very appreciatedLuca

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: October 14, 2020, 09:38:47 pm
content: I had used an HRPG-ASCA-17R (HRPG-ASCA#17R) which has a header. I had removed that and swapped in the original cable and strain relief clip. The pinout is the same. Check the datasheet, I think -19C is a better option if you use this encoder. It is about 6mm shorter; 10mm vs 16mm--see photos. Not an ideal solution, but it was available. The board should be providing 5V to the encoders.

author: lucatz
author_rank: Contributor
timestamp: October 15, 2020, 01:01:12 am
content: Thank You very much ChuckDarwinThat will work out nicely. I will probably print a couple knobs to fit...Luca
Adjustable current limiter for AC line voltage device testing - Page 1
Forum section: electronics / testgear

author: puterboy
author_rank: Regular Contributor
timestamp: October 12, 2020, 02:14:37 pm
content: I would like to add an adjustable A.C. current limiter upstream of my DUT.I know that a simple solution some people use is to wire an incandescent bulb in series but this is not really adjustable unless you have multiple bulbs, etc.I was wondering if there is a simple active circuit, perhaps using IGBT's or TRIACs to shut off the circuit based either on voltage across a sense resistor either in series with the circuit or maybe better in an inductive sense loop created by a couple of turns around the voltage line.Ideally, the current limit would be settable with a potentiometer, bonus if there is a digital display of the limiting current...I could probably hack together some type of circuit, but was hoping to see if anyone has any simple or off-the-shelf examples.Any thoughts?

author: rvalente
author_rank: Frequent Contributor
timestamp: October 12, 2020, 04:49:30 pm
content: What is the voltage/current you're aiming for?I'm aware you've said lamps does not seems to be a choice but, you can arrange 4 to 6 lamps and combine them in various orders, like: 1-2-4-8-16 or 1-2-5-10 or even 1+1+1+1+2+2 this would give you a certain flexibility + a low cost 1KVA variac is a good way to go.Chroma makes very nice AC power supplies, maybe some 2nd hand unit?

author: David Hess
author_rank: Super Contributor
timestamp: October 13, 2020, 07:41:19 am
content: Quote from: puterboy on October 12, 2020, 02:14:37 pmUnless an electronic circuit breaker is acceptable, it comes down to a 2-terminal power current limiter inside of a bridge rectifier which presents some difficulty at typical AC voltages and power levels.
How do i get one single Puls from Keysight 33500 AWG? - Page 1
Forum section: electronics / testgear

author: Coliban
author_rank: Regular Contributor
timestamp: October 12, 2020, 05:29:10 pm
content: Hello,ich have a hard time telling the Keysight 33512B to give me only one Pulse of, let say, 5 V.I try to "cheat" him in triggering one burst with 10Hz which will give me exactly one impuls but unfortunately it also sends a sync and i end with two pulses.The first is the sync signal and the second is the impuls i want.Any thoughts?Thank you.

author: porker1972
author_rank: Contributor
timestamp: October 12, 2020, 10:41:46 pm
content: I know you can do it, not got one at home to try. I think there is a single button in the set-up menu somewhere.Best to call the local call center and they will send you the details.

author: georgd
author_rank: Regular Contributor
timestamp: October 13, 2020, 03:44:55 am
content: Just press theBurstbutton on the front panel, then choose:- Burst - On- N Cycle- # Cycles- # of Cycles - select with knob or enter on numeric keypad.As shown on the picture below.

author: Coliban
author_rank: Regular Contributor
timestamp: October 13, 2020, 04:51:05 am
content: Thank youGeorged: I have exactly this configuration for burst and it give me one single pulse. But it sends a sync before that pulse, as shown in the attachement.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: October 13, 2020, 05:38:25 am
content: Definitely give your local support center a call, you'll get right to an expert and should be able to get a super quick answer. You can use the link in my signature.

author: Coliban
author_rank: Regular Contributor
timestamp: October 13, 2020, 06:43:26 am
content: Thank you!I solved the "problem": I connected me via telnet to the 33512 and stepped through the commands. My poor thoughts were that the pulse were generated only with the "TRIG" command when i studied the scpi commands. While this is true, the awg ALSO sends something like a sync or so (which is shown as the first signal in my attechment) when the awg is *configured* to do the pulse mode.After i removed the scpi command, the awg stopped to adjust the awg to pulse every time before i generate a Pulse, the "sync" signal dissapered.
New Incremental Encoder for LeCroy LT262 - Page 1
Forum section: electronics / testgear

author: Martin72
author_rank: Super Contributor
timestamp: October 01, 2020, 07:37:11 pm
content: Hi at all,Our oldie but goldie waverunner lt262 it´s incremental encoders for the movement of the cursors are nearly "dead"...It´s pain in the ass to use them, time for new ones.But how could I get them ?Are there sutiable alternatives avaible, as I don´t think I could get it today as an original spare part from lecroy ?Any ideas welcome....Martin

author: xemax
author_rank: Contributor
timestamp: October 02, 2020, 08:21:52 am
content: Here are the partlist (login required)https://groups.io/g/LeCroyOwnersGroup/files/Encoder%20Info%20LT%20WR1%20and%20WR2Mouserhttps://eu.mouser.com/ProductDetail/bourns/pec16-4020f-n0024/?qs=7YHpgRs8DgzaOU2kUEObfg==&countrycode=DE&currencycode=EURhttps://eu.mouser.com/ProductDetail/bourns/pec16-4220f-n0024/?qs=6FD5PBp7ZtSGeyX4p%2FuIDg==&countrycode=DE&currencycode=EURxemax

author: Martin72
author_rank: Super Contributor
timestamp: October 02, 2020, 09:45:54 pm
content: Thanks, is this the suitable encoder from mouser ?

author: nctnico
author_rank: Super Contributor
timestamp: October 03, 2020, 10:18:34 am
content: Check the board first to see if there are signals coming from the encoders when you turn them AND check if these signals end up at the chip / microcontroller processing them. In my Lecroy 7200A the problem wasn't the encoders but several broken diodes. I did buy new encoders though so I replaced these first but that didn't fix the problem.

author: Martin72
author_rank: Super Contributor
timestamp: October 03, 2020, 08:47:39 pm
content: Interesting advice.Problem is as follows:When trying to move the cursors via the encoders, the response is real slow and somekind of "random jumping" (e.g., you will turn the cursor to the right, then you rotate the knob into this direction, you must do it very slowly, otherwise nothing will happen and often the cursors turn suddenly in the other direction you rotate the knob - And also suddenly "right" again).

author: Martin72
author_rank: Super Contributor
timestamp: October 11, 2020, 08:05:09 pm
content: Quote from: xemax on October 02, 2020, 08:21:52 amFollowing this link will always get me to the home site...

author: Fretec
author_rank: Contributor
timestamp: October 12, 2020, 09:22:33 pm
content: Quote from: Martin72 on October 03, 2020, 08:47:39 pmWhile I don't assume LeCroy uses cheap parts, I had simular issues on a device with rather cheap looking encoders with no brand name printed on them, and flushing them with contact cleaner helped (they were optical from what I could see but I guess dirt got inside and was interfering), so maybe worth a try.
EZM328 Transistor checker firmware update (v1.13k) - Page 1
Forum section: electronics / testgear

author: cat101
author_rank: Newbie
timestamp: October 12, 2020, 04:02:54 pm
content: Hi. My transistor checker got burnt when trying to measure a charged cap. Since I could not find a ready made firmware for my variant and it took me a while to figure out all the details, I wanted to post my build so that others could use it.My tester was sold as:EZM328(GM328R) Transistor Tester ESR Meter Frequency Counter Signal GeneratorOn the boards you can see the following markings:EZM328 V1.10 board (2015.08)LCM_12864_V2.0EZM Electronics StudioThe original firmware was:FW v1.13 (2017) by "EZM elec.studio"After some work I determined that the FW variant I needed was "mega328_st7565". On the attachments you will find a ready built image (version 1.13k from SVN revision 854) and my modified Makefile.In order to program it (with USBasp) I used these commandsCode:TOOLDIR="/home/user/Applications/arduino/hardware/tools/avr"AVRDUDE="$TOOLDIR/bin/avrdude -C $TOOLDIR/etc/avrdude.conf -c usbasp -p atmega328p"IMAGEDIR="/tmp"$AVRDUDE -U flash:w:$IMAGEDIR/mega328_st7565.hex:a -U eeprom:w:$IMAGEDIR/mega328_st7565.eep:a -U lfuse:w:0xF7:m -U hfuse:w:0xD9:m -U efuse:w:0xFC:mEnjoy!
DMM6500 Temperature Scan - Page 1
Forum section: electronics / testgear

author: mtnzap73
author_rank: Contributor
timestamp: October 11, 2020, 12:55:40 am
content: When I get a DMM6500, the following will become clearer. In the meantime, I am currently reading the DMM6500 reference manual, and it triggers some observations/questions.1. The following SCPI command indicates that the installed scan card is recognized by the DMM::SYSTem:CARD1:IDN?For physical cards, this returns a comma-separated string that contains the model number,description, firmware revision, and serial number of the card installed in the specified slot.2. The following indicates that there is some hard coded expectation that the reference is on channel 1:External reference junction, page 5-68Thermocouple readings using the rear terminals can be configured to use an external referencejunction setting. The DMM6500 assumes the external reference junction is connected to channel 1.3. When a temperature measurement is made on a channel >1, will the DMM automatically utilize the reading taken off of channel 1 as the reference, and thereby do built-in calculations to present a referenced tempmeasurement for channels >1?4. Given that the DMM recognizes what scan card is present, if one installs a 2000-SCAN card, which does not have the built-in external reference on the scan card, can one manually connect a reference to channel 1 of the2000-SCAN card, and then have the DMM operate just like a 2001-TCSCAN card is present, even though the DMM will only see a 2000-SCAN card?

author: mtnzap73
author_rank: Contributor
timestamp: October 12, 2020, 02:27:57 am
content: A simpler question:Is the 2000-SCAN card used for temperature measurements using thermocouples?
Faulty Tenma 72-7780, Beeps/5s - Page 1
Forum section: electronics / testgear

author: crypton
author_rank: Contributor
timestamp: October 10, 2020, 06:22:36 pm
content: I have a faulty Tenma marked as 72-7780 at hand (in this forum, claimed as UT-139C rebadge) that is seemingly broken.I don't know what happened exactly to this multimeter (got it as a dumbster dive). Measured the fuses and they were ok.The multimeter shows all segments enabled on the display and beeps every 5 seconds in any position of the dial.I haven't been able to find any chipset reference (nor dare to remove LCD module on that Tenma to see the used uC) nor found any info on Tenma model's error codes.Any idea what this means and if and how this could be repaired ?There is a unpopulated SDA/SCL header, but I'm unsure how to read data from there or if anything useful could be retrieved from there at all.EDIT:I read:DTM0660LRF TWN.DThere's another chip in SOIC type of package,T24C02A18s0F1an EEPROM chip.translated datasheet

author: rvalente
author_rank: Frequent Contributor
timestamp: October 11, 2020, 02:20:24 pm
content: Could be a faulty power supply or the chipset may have entered some self test/display teste mode. Without knowing the chipset and reading it datasheets is kinda off impossible to give any advice.Take the LCD out and read the chipset, its very hard to hurt it and even if you do, its a freebie, not much to loose

author: crypton
author_rank: Contributor
timestamp: October 11, 2020, 03:30:52 pm
content: Ok, took the module off (in hopes reassembly works)I read:DTM0660LRF TWN.DThere's another chip in SOIC type of package,T24C02A18s0F1an EEPROM chip.Searching both for these PN's, quite many relevant posts came up about hacking and modifying meters with same architecture.From atranslated datasheet, I could read out that the meter could, possibly, be stuck at power up - all segments are on, but I don't get EEPROM error from LCD though.
Cal Test Active Diff + Power Adapter - Page 1
Forum section: electronics / testgear

author: cpcfreak
author_rank: Newbie
timestamp: October 12, 2020, 12:14:49 am
content: Hi,Can anyone give me some advice or feedback regarding the Cal Test Active Differential Probes and the matching Cal Test USB power adapter?I'm looking for an inexpesnive differential probe that I can use for long term monitoring / logging, there is not much information about the battery life in the Cal Test probes, so I'm assuming I'll have to power them off a plug pack, but I see they also offer a USB power adapater?Cal test Active Differnetial Probe CT2593Cal Test USB 5VDC CT4122I'm assuming the 5VDC USB is mains earth referenced through the USB port, so as such not really useful in a differential probe setup. But in fairness to Cal Test I cannot find much information about it, if someone has the above models or similar models some existing user feedback would be greatly appreciated before I shell out some cash.Regards,Justin

author: tautech
author_rank: Super Contributor
timestamp: October 12, 2020, 12:31:41 am
content: Welcome to the forum.Any Diff probe that uses an external supply will also use a DC-DC convertor for isolation.As you're in the land of OZ Dave's diff probe might be worthy of consideration:https://www.eevblog.com/product/hvp70/

author: cpcfreak
author_rank: Newbie
timestamp: October 12, 2020, 12:50:58 am
content: Thanks for the welcome, and also thanks for the advice.Yep I'll look into Dave's HVP70, have you any idea how long these will run off the batteries as I'm looking for a fault that occurs intermittently once every 2 or 3 days?

author: tautech
author_rank: Super Contributor
timestamp: October 12, 2020, 12:57:41 am
content: Quote from: cpcfreak on October 12, 2020, 12:50:58 amNo sorry I don't but of course battery quality will have an impact on that also.I suspect any wallwart that matches the required specs will work just fine with it providing its output is polarity correct.
SMA100 screen failures - Page 1
Forum section: electronics / testgear

author: ornea
author_rank: Unknown
timestamp: October 11, 2020, 10:25:44 pm
content: We seem to be experiencing a run of R&S SMA100 display failures. 3 out of 7 is the current total.Thankfully R&S have the web access screen control so we have a work aroundJust curious if anyone else is having issues.
Ordered Riden DPS5020 PS controller module - Page 1
Forum section: electronics / testgear

author: iXod
author_rank: Frequent Contributor
timestamp: October 10, 2020, 08:47:53 pm
content: Well, actually it's in my Aliexpress cart,readyto go.I'm buying these both from the manufacturer ("RD RIDEN store"). It's my first Ali purchase.I checked shipping costs and:"Free" gets it here (USA) in about 4 weeks.If I want to pay UPS I can have it here in 1.5-2 weeks.It will cost $30 to speed up the PS module.It will cost an additional $30 to speed up the tin box (and fan, terminals, screws, etc...) that I'm going to put it in.Since I'm buying these from the manufacturer's store, can't they put them both in one box and save me some $$? I know that the 2x volume of the combined box isn't free, but I don't see the option to combine items to savesomeshipping.Do Ali sellers offer this? What am I missing?The benefit of your experience, please.Thanks.

author: ceoxrad
author_rank: Regular Contributor
timestamp: October 10, 2020, 09:00:54 pm
content: Try to contact the seller, there is a chance they will understand and help you out.Note that these shipping options will be checked more carefully by customs, so be prepared to pay additional fees

author: iXod
author_rank: Frequent Contributor
timestamp: October 10, 2020, 09:24:53 pm
content: Thanks for your reply.What do you mean that customs will check my choice of shipping? How does that affect the customs (whether I ship quickly or not)?Do you mean that the increased cost of shipping increases the total cost and this requires a closer look at the order?Thanks.- - - - -Edit:This article says that the "de minimis" value for USA is US$800, Canada US$117, and Mexico US$100. De minimis is the total amount of an international order (including shipping costs) placed by a citizen of that country that will be allowed into his or her country duty- and customs-free.https://www.ups.com/us/en/services/knowledge-center/resources/glossary.page?kid=dcb17032ea0ad8My total order is significantly less than the threshold so no issues.Thanks.

author: ceoxrad
author_rank: Regular Contributor
timestamp: October 11, 2020, 01:56:53 pm
content: Yeah, i mean that usually parcels shipped with seller shipping method will not get special attention by customs and so you are less likely to pay additional fees if the object has a declared value higher than the minimum.The minimum varies between countries, in your case there is no problem since the order is below US minimum
Kay Electronics 860B Sweep-Gen Manual Request - Page 1
Forum section: electronics / testgear

author: Cyberdragon
author_rank: Super Contributor
timestamp: March 21, 2018, 07:05:23 pm
content: (Deleting and recreating my post because I'm totally wrong)At first I thought Kay Electronics were these guys,http://www.kayelectronics.com/since it's radio equipment. But no, it's not, it says "Pine Brook N.J." in big stencils on the machine, not Texas. I'm wondering if it's some proprietary piece of equipment from a service shop. It says "patent pending" so I assume it was a product they sold.Do I have any chance in hell of finding a manual?EDIT: I was going to post in the repair section about fixing the output meter, but it appears it could just be a blown tube (I don't see glow in a 12AU6). Some of the other tubes appear to be running white hot though, so there could be a filament supply problem.

author: Cyberdragon
author_rank: Super Contributor
timestamp: March 22, 2018, 05:43:29 am
content: There's nothing wrong with the meter. You apparently have to enable the "line lock" for the meter to work otherwise it's grounded. (This is what manuals are for)"Eeww!" *removes dead stink beetles*It also happens to be one ofthosemachines where it takes literally hours to temp stabalize, and there's no heater. However, the range switch is horribly dirty to the point where it's unreliable and one range is dead unless you force it to an exact spot. Does this have anything to do with the frequency increasing slowly over several hours?Someone has also been inside to replace the line cord, as some screws are missing and the remaining two front ones are phillips. They also must have mangled the chassis screw threads as they were an absolute pain in the arse to get in without crossthreading, took me probably 10 minutes...per screw!Everything else is still original and has anti-tamper goop on it.

author: KK6IL
author_rank: Regular Contributor
timestamp: October 11, 2020, 12:33:18 am
content: Same mistake I made perhaps. It's not Kay Electronics, but Kay Elemetrics Corp, which was in Pine Brook NJ.Googling that name, I see they are now a division of Pentax Medical, and apparently no longer making RF equipment.
Saleae Logic16 clone bitstream - Page 1
Forum section: electronics / testgear

author: dgo_42
author_rank: Newbie
timestamp: October 10, 2020, 03:20:51 pm
content: Hello all,my friend as he was in China has bout Saleae16 Logic Analyzer clone (he don't know that it was clone) 8 years ago.It works fine with 1.1.15 software. Last sommer he try to use it but after some days it won't work any more.After some investigation we've found, that the cloned analyzer comparing to the original does have separated SPI flash for bitstream.(Original one loads a bitstream each time the PC software starts or if threshold voltage is switched)And unfortunately this flash has lost the data...We've tried to restore loading bitstream from PC through cypress FX2 using information from sigrok website as the original analyzer do.The analyzer has start to work, but we can sample data only within ca. 5 seconds after bitstream is loaded into FPGA.It seems in original bitstream exists some protection, some time bomb.Maybe somebody has this device and can share the original bitstream saved in the flash (M25P40).This is the device:
Manual for a Fluke 873A? - Page 1
Forum section: electronics / testgear

author: Stray Electron
author_rank: Super Contributor
timestamp: October 08, 2020, 01:43:09 am
content: Anybody know where I can download a copy? I rescued one from a trash pile and I don't plan on using it but I'd like to study and see how it works.

author: Jay_Diddy_B
author_rank: Super Contributor
timestamp: October 09, 2020, 01:38:53 am
content: Hi,I have a paper copy of the Fluke 885A differential voltmeter.There is a scan here:https://www.lost-manuals.com/manufacturer/Fluke/885AThis is a very similar instrument.The unit will (probably) contain:1) A voltage reference2) Kelvin Varley Divider3) Chopper based null-detector.Regards,Jay_Diddy_B

author: Stray Electron
author_rank: Super Contributor
timestamp: October 09, 2020, 02:24:17 am
content: Quote from: Jay_Diddy_B on October 09, 2020, 01:38:53 amIt does. The voltage reference is two zener diodes in series and in series with a selected value resistor to set the desired current level for the zeners. Exactly the same as the Fluke 893. It's very similar to the Fluke 893s that I have but the reference designators are different. But I found a manual for the Fluke 887 and it seems to use the same reference designators so I was able to trace the circuits. Other than the Ref Des, it's not that different from the 893s. I found this one in a scrap yard and it had been sitting there so long that the paint had faded and the leather handle rotted away. But it was surprisingly clean inside. Two the caps had leaked and had what looked like mold on the ends of them and one of the precision resistors was open but otherwise it looks like it would work. Some of the shafts for the rolling dials were corroded and the dials wouldn't rotate but a little PB Blaster fixed that. I checked a bunch of the precision resistors and they were all in spec. This one appears to have been built in February 1967 and held up well despite being left out in the weather, probably for years.Many of the transistors in it were rather add. They TO-18 sized but the bodies appear to be white ceramic with a black epoxy domed top and the legs are all gold plated. The one that examined was a CDQ 23030. They were made by Continental Devices. I don't know if they ever produced any transistors in the US but today they're located in India.
Buying a DMM6500 Directly from Tektronix - Page 1
Forum section: electronics / testgear

author: mtnzap73
author_rank: Contributor
timestamp: October 11, 2020, 01:03:31 am
content: Currently the DMM6500 is CAD $1590 athttps://www.tek.com/tektronix-and-keithley-digital-multimeter/dmm6500Does anyone know if Tek charges shipping on top of that? (note: Keysight includes shipping in their on line prices).DMM6500 is CAD $1654 at Newark, including shipping.Any other ideas?

author: Bugsyson
author_rank: Contributor
timestamp: October 11, 2020, 04:03:31 am
content: I bought mine from testforce, I did not get charged shipping, but there was an Admin fee of$37.74 and the good old GST. They have it for $1190 USD= $1574 CAD.Happy shopping

author: mtnzap73
author_rank: Contributor
timestamp: October 11, 2020, 05:14:41 am
content: That's good info Bugsyon.I tried out that site and got to the checkout, and it shows $0 shipping, 5% GST, and that's all.I sent them an email asking if there is any Admin Fee.Did you get caught on this after the sale was committed?For the Tek site, they require a PO, so there is no checkout to see shipping or not.One sends in an RFQ and they quote back. In the quote there is no shipping, but they do show GST.

author: mtnzap73
author_rank: Contributor
timestamp: October 11, 2020, 05:42:36 am
content: Could that Admin Fee be the exchange 'admin fee'?If so, that's hard to avoid on a USD purchase.

author: TheSteve
author_rank: Unknown
timestamp: October 11, 2020, 06:07:16 am
content: I'd try giving Newark a call and ask them to match the Tek.com pricing.

author: Bugsyson
author_rank: Contributor
timestamp: October 11, 2020, 03:27:41 pm
content: The admin fee was fully disclosed on my quote. ( education discount). You may not have to pay it if buying straight off the web site.

author: mtnzap73
author_rank: Contributor
timestamp: October 12, 2020, 08:52:40 pm
content: I tried an RFQ with Newark, asking to match Tek's own price.They responded with a quote, and it was exactly the same as on the website.Strikeout for Newark.

author: Electro Fan
author_rank: Super Contributor
timestamp: October 13, 2020, 02:04:24 am
content: Maybe try ValueTronics
Philips PM2534 problem please help - Page 1
Forum section: electronics / testgear

author: tino van seggelen
author_rank: Newbie
timestamp: July 16, 2020, 12:59:31 pm
content: I have a Philips PM2534 Digital multimeter that only displays dashes.I can operate it, change the range but it only displays dashesPlease helpThanks in advance

author: tggzzz
author_rank: Super Contributor
timestamp: July 16, 2020, 02:30:19 pm
content: Did it ever work?Look slowly and carefully at every component, for any obvious faults. Wiggle connectors, clean if necessary.Get the service manualhttps://www.google.com/search?q=philips+pm2534+service+manualCheck the PSU voltages and ripple. Replace capacitors if necessary. Follow the service diagnostics.

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 16, 2020, 06:08:39 pm
content: According to the users manual it does that when it is in single trigger mode and there is no result available yet.

author: PA1BS
author_rank: Newbie
timestamp: October 08, 2020, 07:21:34 pm
content: Hi,Do you have the indicators "M RNG" and "S TRG" on the bottom left of the display.If you have then its in manual ranging mode with single trigger and waits for a trigger.Press the AUT/MAN and then SINGLE buttons to leave this mode.73, Ben
E4438C hacked? - Page 1
Forum section: electronics / testgear

author: electrolust
author_rank: Unknown
timestamp: October 02, 2020, 07:09:55 am
content: I don't suppose there's any chance that folks have hacked the E4438C?AgilentKeysight stlll supports it, but doesn't sell it anymore and also won't sell options/upgrades. This is really limiting.

author: PA0PBZ
author_rank: Super Contributor
timestamp: October 02, 2020, 09:58:19 am
content: I can see if there is a way to produce working license keys but I need the hostid of the instrument and preferably an existing option code + license key.

author: tv84
author_rank: Super Contributor
timestamp: October 07, 2020, 02:24:06 pm
content: This should work.Examples of the license format:FEATURE400agilent 1.0 permanent uncountedE59AA3F2687DHOSTID=ID_STRING=4413F4DCFEATURE401agilent 1.0 permanent uncountedE2A0A6F56E7AHOSTID=ID_STRING=4413F4DC
500 mHz Gauss with DDS-3X25 - Page 1
Forum section: electronics / testgear

author: jazzalex
author_rank: Regular Contributor
timestamp: October 07, 2020, 01:32:12 pm
content: Hello all,I have a Hantek DDS-3X25 AWG and would like to generate a low frequency 500 mHz Gaussian puls with it. My problem is that I have so far never generated an arbitrary signal via a CVS file. Can anyone give me pointer how to do this regarding the format and further relevant aspects - especially with the DDS-3X25 ?Thanks a lot in advance,bestAlex

author: Mechatrommer
author_rank: Super Contributor
timestamp: October 07, 2020, 01:46:58 pm
content: you may try this?http://www.soasystem.com/eng/goltek/index.htm

author: jazzalex
author_rank: Regular Contributor
timestamp: October 07, 2020, 01:56:31 pm
content: Ah - looks familiar :-) Have installed it a couple of years ago but have not used it in the current context yet. Will bring it up2date, check it out and will get back with the results. Thanks !
Getting the optical power of a UV-LED using a spectrometer data - Page 1
Forum section: electronics / testgear

author: Kamel
author_rank: Newbie
timestamp: October 07, 2020, 08:22:33 am
content: Hello everyone,if it is possible can you let me know the way to get the radiated power of a UV-LED using the output data from the "Ocean optics- Maya pro 2000" spectrometer, or the calculations needed to calculated from that data.in the data sheet of the UV-LED the radiated power from 2mW to 6 mW, i uploaded a screenshot for the spectrometer data.thanks in advance.

author: jogri
author_rank: Frequent Contributor
timestamp: October 07, 2020, 11:00:32 am
content: Short answer:Take a look at the last column... uWatt: 1074 -> 1.074mWLong answer:A spectrometer is the wrong kind of equipment for this task, it is designed to get the spectral composition of a single point (you don't want to have the lights in your room influencing your measurement). So you can either take the raw uWatt number the spectrometer is spitting out, knowing that it doesn't represent the full light output of the LED in all directions or you can try to calculate the percentage of light from your LED that is hitting your sensor. For that, you'd need the beam characteristic and intensity of the LED and the distance of the LED to the fiber so you can calculate how much of the emitted light actually enters the fiber/spectrometer.Or you can fiddle with the position of the LED relative to the fiber until you get a maximal reading and just take this number (as a qualitive measurement of the intensity in the main beam direction) for every LED... Not a perfect, but a rather quick solution (just turn down the spectral resolution and the measurement range to 200-350nm for quicker measurements).Or you can buy the proper equipment for this job, an integrating sphere or a goniophotometer. Not that cheap though.

author: Kamel
author_rank: Newbie
timestamp: October 07, 2020, 12:08:01 pm
content: Hello sir,thank you for your answer, i was thinking that i have to take the second last unit from down the table "uwatt/cm2" and do some calculations to get the radiated power, but now i think the power is the last unit "uwatt", so in that picture the power is 9.6mWatt.for your not about the room light, that spectrometer has an option to make us measure the surrounding light in the room first to take it as a reference then it measures the light next, check that link step number 8https://www.oceaninsight.com/support/knowledge-hub/hints--tips/measuring-lamp-output-power/thank you for your answer
Rigol 2072: how to shut off? - Page 1
Forum section: electronics / testgear

author: whyami
author_rank: Newbie
timestamp: October 04, 2020, 01:34:37 pm
content: I just bought a used Rigol 2072 oscilloscope and it seems to work great except one thing is confusing me: how to shut the unit off. When I try to shut the unit off with the on-off button, the button starts pulsing as if the unit is going to "sleep" and the display shuts off, but the fan remains on. If I unplug and replug the unit in it automatically turns on. So it appears as long as the unit is plugged in the fan is on. Is the normal behavior? Is there something I'm missing here?

author: JDubU
author_rank: Frequent Contributor
timestamp: October 07, 2020, 12:51:33 am
content: The fan shouldnotbe on when the scope is powered off and the power button is blinking. Just verified that on my DS2072.
Better probe for cheap pocket oscilloscopes? - Page 1
Forum section: electronics / testgear

author: Ivanko1
author_rank: Contributor
timestamp: October 06, 2020, 10:24:59 pm
content: What probe to by, for cheap pocket oscilloscopes, like Fnirsi 5012H, 2013H, renewed 1C15 or even SigPeak DSO1511E+ or Hantek 2C42.Instead of P6100 wich often included in a box, wich rather be better for something like DSO138/150.)I know, many will reccomend something like Rigol PVP2150 - but it's expensive.)Would be something like PP-150/250, or P2100/P2200 - be better alternative?Does it make sence to buy >200MHz+ probes for <110MHz oscilloscopes?Thank you!)

author: tautech
author_rank: Super Contributor
timestamp: October 07, 2020, 01:36:53 am
content: Quote from: Ivanko1 on October 06, 2020, 10:24:59 pmNot really for the class of scopes you list due to their limited sensitivity where you will need probes with 1x capability.P6100 probes should be fine for this class of scope.

author: radiolistener
author_rank: Super Contributor
timestamp: October 07, 2020, 06:34:37 pm
content: BNC cable with alligators will be good enough probe for such class of devices:High bandwidth probe means that you will catch much more noises and aliases on your low frequency oscilloscope. So, there is no sense to use 200 MHz probe with such class device.Fnirsi 1C15 has just 200 MS/s ADC. It means that the input signal should be limited with about 200/(2*3) = 30 MHz (in order to avoid aliases).So, it's better to look for a probe with 30 MHz bandwidth.
Rigol RSA5000N vector network analyser - Page 1
Forum section: electronics / testgear

author: Sighound36
author_rank: Frequent Contributor
timestamp: July 16, 2020, 09:34:50 pm
content: Rigol have just released a new version of the RSA 5000 real time analyser now with a vector network functionality with distance to fault I believe starting prices are from 2200 for the basic model upto 9700 euros for the 5065Nhttps://int.rigol.com/products/spectrum-analyzers/rsa5000.html

author: OwO
author_rank: Super Contributor
timestamp: July 17, 2020, 03:21:33 am
content: Specs are quite meh considering the price. Port VSWR is 1.6 up to 3GHz, which is only 12.7dB return loss. Dynamic range is only 80dB (frequency range unspecified, could be worse at 3GHz). That's nanovna level performance. At least they had the sense to include the VNA feature for free (competition from the nanovna probably influenced this).And of course, only calibrated directivity specs. I'm sure they use the same kind of reflectometer as siglent which relies on a balun for common mode rejection. The raw directivity is going to be zero below a few tens of MHz, and less than 10dB at the upper frequencies. The raw directivity is hidden by the factory cal and the user cal.

author: tv84
author_rank: Super Contributor
timestamp: July 21, 2020, 09:09:48 pm
content: Rigol RSA3030N - 3.0 GHz Real-Time Spectrum Analyzer with Vector Network Analysisis also on sale for $5,799 USD.Rigol RSA3045N - 4.5 GHz Real-Time Spectrum Analyzer with Vector Network Analysiscosts $6,999 USD.Rigol RSA5032N - 3.2 GHz Real Time Spectrum Analyzer with Vector Network Analysiscosts $8,999 USD.Rigol RSA5065N - 6.5 GHz Real Time Spectrum Analyzer with Vector Network Analysiscosts $10,999 USD.

author: noreply
author_rank: Frequent Contributor
timestamp: July 22, 2020, 03:05:17 am
content: Nice

author: tv84
author_rank: Super Contributor
timestamp: August 18, 2020, 02:10:32 pm
content: New firmware v00.03.00.00.29.See RSA5000 thread.

author: tv84
author_rank: Super Contributor
timestamp: October 06, 2020, 02:47:52 pm
content: Little brother upgrade.

author: justanothername
author_rank: Regular Contributor
timestamp: October 06, 2020, 03:48:42 pm
content: @tv84 please explain!
Agilent ESA-E software ? - Page 1
Forum section: electronics / testgear

author: xymox
author_rank: Contributor
timestamp: September 05, 2020, 07:15:09 pm
content: What is the best software for the ESA-E ( E4402B ) mine is loaded and I have 82357A GPIB to USBI need a waterfall plot. But other goodies would be good too... If I had to I could go back to a older OS, but would prefer win 10

author: xymox
author_rank: Contributor
timestamp: September 05, 2020, 09:10:06 pm
content: Getting benchlink setup on a new XP VMware machine is challenging.. Mostly because VMware wont let the Java installer run because it attempts a "illegal instruction"..Keysight current software does not support the ESA-E models.I suppose I could setup a old laptop on XP, or even Win 2000.. But I would prefer some way to get waterfall plots on a Win 10 machine.

author: apples
author_rank: Newbie
timestamp: October 05, 2020, 07:57:51 pm
content: @xymox Hi having just upgraded my ESA and acquired a GPIB <> USB interface, I'm working on this too.Closest I found ishttp://www.ke5fx.com/gpib/readme.htmwhich looks quite promising, but I'm having difficulty getting it to work with my Keysight GPIB adaptor.Keep me informed if you figure anything out.Duncan

author: Tony_G
author_rank: Super Contributor
timestamp: October 06, 2020, 07:24:19 pm
content: You can use the KE5FX toolkit with the Keysight IO Libraries suite but you also need to install the NI VISA library - It's pretty sensitive to getting it setup correctly as you need to install as a secondary VISA library and then you can set it up as as an adapter - From memory you need to install the NI bits first and then the Keysight ones and select secondary. Then in the NI 488.2 properties you need to turn on the tullip.dll driver (sp?).I shifted from a Keysight adapter over to an NI Etherner to GPIB adapter and haven't set this up in some time but I'm happy to try and help if needed.TonyG
BWD 1722B large screen CRO - Page 1
Forum section: electronics / testgear

author: duodiode62
author_rank: Contributor
timestamp: October 04, 2020, 10:42:46 pm
content: Hello. I recently obtained a BWD 1722B oscilloscope and would like to obtain a service manual for it, or at least a decent circuit diagram. Can anyone out there be of help?Cheers, Stuart

author: tautech
author_rank: Super Contributor
timestamp: October 05, 2020, 12:01:34 am
content: Welcome to the forum.Oh wow.....and it's like large display DSO's today are something new !The best BWD resource is Kevin Chant and if he hasn't posted any documentation on these drop him a line with maybe a link back to this thread to see the size of that beast.https://www.kevinchant.com/bwd.html

author: amspire
author_rank: Super Contributor
timestamp: October 05, 2020, 01:00:38 am
content: It is probably sharing some of the circuitry with other models which have documentation.Is it a tube + transistor circuit inside? It looks a bit like their 5MHz oscilloscope models.Richard

author: duodiode62
author_rank: Contributor
timestamp: October 05, 2020, 01:29:33 am
content: Thanks Richard. I'll have a look at other models. Yes, it is a hybrid design, with 6CW4 nuvistors in the vertical amplifiers and 12AT7s in the time base, as well as lots of transistors. The E.H.T. generator also has valves. I may have come unstuck here, as the core of the E.H.T. generator transformer is broken; however, it does look like a Philips standard line output transformer as used in millions of 1960s B&W TV sets, so I may be able to find a replacement. The vertical and horizontal deflection power amplifiers use heaps of 2N3055s driving what looks like a standard TV deflection yoke. The CRT is a '50s style 70 degree 17" TV type, looks to be a 17CGP4.Thanks Tautech. I've looked at Kevin Chant's site, and its not there. But I will have a look through to see if there are similar pre-amplifier and time base designs.Cheers, Stuart

author: james_s
author_rank: Super Contributor
timestamp: October 05, 2020, 04:23:58 am
content: An analog scope using magnetic deflection has got to be very slow by scope standards. It might make a good vector monitor to play something like Asteroids on.

author: amspire
author_rank: Super Contributor
timestamp: October 05, 2020, 05:57:47 am
content: That scope turns out to be only 15kHz bandwidth - that is not a misprint. Trigger goes to 25kHz.It is designed for viewing electro-medical outputs, classroom demonstrations and servo waveforms.1722B is the mainframe and plugins include 17A (balanced input to 25mV/div), 17B/2 (unbalanced 30mV/div) and 17D (50uV/div).So I doubt that looking at any other manuals would help - it is a very specialised model.
Siglent sds1204x-e setting vertical scale and position - Page 1
Forum section: electronics / testgear

author: BlackICE
author_rank: Regular Contributor
timestamp: October 05, 2020, 05:57:16 am
content: Using a single trigger mode I want to capture a full 14 Meg sample buffer at the highest possible resolution. To do this should I set the vertical scale and position to maximize each channel's trace to just fit the screen and then after a trigger I can change the scale and positions to view the data to make them more viewable? Less overlapped between channels. I tried using the math function after a capture and that seems to work fine. Does the same apply to the each channels probe attenuation? That is can I trigger usinng 1x then switch after capture to 10x and the values captured in memory will be treated as 10x larger, or are the values unchanged?

author: tautech
author_rank: Super Contributor
timestamp: October 05, 2020, 06:52:04 am
content: Quote from: BlackICE on October 05, 2020, 05:57:16 amCapture depth is timebase dependant and the best way to do this is use a slow timebase setting where the mem depth displayed is greatest and then magnify the capture.There are 2 ways to examine the capture in detail, just magnify with the timebase control where in a default setting the trigger point is in the middle of the capture and remains so with the magnification yet still let you pan horizontally through the capture. Its disadvantage is that other than the horizontal offset indicator you have no way of knowing exactly where you are in the capture.This can be solved with the Zoom feature that can be selected before or after the capture in which you'll work with the secondary (Zoom) timebase. Then the Zoom horizontal indicator shows where you are WRT the primary timebase trigger point.QuoteSet probe and channel input attenuation to matching and then forget it ! Period.Vertical magnification of a capture is done with the V/div control.Have fun.
A power supply similar to one shown in EEVblog #168 - Page 1
Forum section: electronics / testgear

author: Esquared
author_rank: Contributor
timestamp: September 25, 2020, 04:27:41 am
content: I am looking for a supply like this onehttps://youtu.be/R_PbjbRaO2E?t=345Dual tracking +/- 20V or so and mains isolated. If there is something available on the market or if anyone happens to know what year in Electronics Australia this was written up in that would be amazing.

author: wilfred
author_rank: Super Contributor
timestamp: September 25, 2020, 06:43:50 am
content: Are you talking about the "Multi-Power" one Dave is holding up in the videos thumbnail? That was from Silicon chip magazine April 2002.Silicon chip also did a +/- 0-19V one in June/July 2010.Otherwise you might be looking at Feb 1987.https://archive.org/stream/EA1987/EA%201987-02%20February#page/n41/mode/2up

author: tom66
author_rank: Super Contributor
timestamp: September 25, 2020, 08:17:43 am
content: Most dual channel power supplies can be configured into a dual tracking mode for split supply operation.One thing to be cautious about is the inexpensive ones can go a bit nuts when you turn them off. I had a supply configured as +/-5V which on power off would have the positive rail gently drop to 0V and the negative rail spike to -20V before dropping to 0V. Could kill a sensitive device.

author: Esquared
author_rank: Contributor
timestamp: September 25, 2020, 05:19:48 pm
content: The Feb 1987 one was what I was looking at. Sorry I accidently created detective work! Whoops! I should've posted timestamps. Yeah that one has exactly the features I'm looking for.

author: ledtester
author_rank: Super Contributor
timestamp: September 25, 2020, 07:19:17 pm
content: Another design:https://youtu.be/jBtNH1EbU8MYou might also be interested in his power supply testing video:https://youtu.be/RdT-xWC4h4kEdit: urls fixed

author: Esquared
author_rank: Contributor
timestamp: October 04, 2020, 07:04:31 am
content: The youtube links were borked but I used the video id after the slash to find them.In case anyone else is looking at the same stuff here is what ledtester was linking they are both associated with this posthttps://www.eevblog.com/forum/projects/building-a-simple-compact-dual-rail-linear-bench-supply/