hybridfree/eevblog-posts huggingface dataset:
FTS 4060 manual available for download - Page 1
Forum section: electronics / general

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: March 07, 2020, 05:33:08 pm
content: Hi,A scanned copy of the FTS 4060 Cesium standard manual is now available at the KO4BB manuals site:;http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=02_GPS_Timing/Frequency_and_Time_SystemsEnjoy!Corby

author: notfaded1
author_rank: Frequent Contributor
timestamp: March 09, 2020, 04:02:27 am
content: Thanks Corby. I think a lot in here will help me with my 4040A too. It's a whole lot more information than I had so far. I have many of the exact same boards in my unit. Most of the front is exactly the same... even the boards are numbered the same with part numbers that all match.Bill
Recommended releable cal labs in Europe - Page 1
Forum section: electronics / general

author: rolkinas
author_rank: Contributor
timestamp: January 10, 2020, 11:27:30 pm
content: Hi to all !I think it would be useful to have information about affordable reliable calibration labs for hobbists in europe.In some countries (such as mine) there are only calibration labs which does not provide calibration+adjustment service.Tell good/bad experience you had calibrating your instrument.Optional info: instrument model, performed adjustments and/or repairs, price of service.

author: Micke
author_rank: Regular Contributor
timestamp: January 11, 2020, 02:38:48 pm
content: In Sweden, I can recommend Nanocalhttps://nanocal.se/en/If you want adjustment as well, it is included in the price. and you get calibration reports with measurement values before/after adjustment.I adjusted and calibrated my Agilent 34410A that was +17ppm on 10VDC, it costed 1075 SEK (incl. 25% tax) which equals 100 Euro.They used Datron 4808, Agilent 33250A Function/Arbitrary Generator and General Radio 1409-Y Standard Capacitor during calibration.

author: grizewald
author_rank: Frequent Contributor
timestamp: January 11, 2020, 09:14:41 pm
content: Interesting. It's a shame they are so far away (I'm in Stockholm) but it sounds like they offer a service that a hobbyist can actually afford.I'd love to get my Solartron 7075 calibrated. It's stable, but fairly obviously way out of calibration on some ranges and functions. Considering its age, it would probably stay calibrated for a long time after being adjusted and would serve as a superb transfer standard for the rest of my equipment.The biggest problem is finding a courier which I'd actually trust to ship the Solartron to Gotland and back... Maybe I should plan a week's relaxation in Visby before the tourist season starts.

author: grizewald
author_rank: Frequent Contributor
timestamp: February 27, 2020, 10:28:59 am
content: Quote from: Micke on January 11, 2020, 02:38:48 pmThank you again for this recommendation. I've just spent the last few days in Visby together with Kjell (the guy who owns Nanocal) getting my Solartron 7061 7.5 digit meter calibrated and adjusted and calibrating my various voltage references and precision resistors.I paid a very reasonable price for the calibration and Kjell is someone who is genuinely interested in the field that he works in. You could say he's a volt-nut's volt nut!My only problem at the moment seems to be getting back home from Gotland as they keep cancelling my ferry departures.

author: grizewald
author_rank: Frequent Contributor
timestamp: February 27, 2020, 11:32:59 am
content: Here's my 7061 meeting the accuracy of the Datron 4808.The meter was out on approximately the ranges that I suspected:After adjustment, everything was looking just fine:
Fluke family 720A, 721A & 750A - Page 1
Forum section: electronics / general

author: sarel.wagner
author_rank: Regular Contributor
timestamp: March 26, 2020, 10:27:43 am
content: Managed to get 3 family members earlier this week as the title showsThe Null meter and voltage source sadly are missingthere was something floating around inside so I fount a piece of plastic broken off one of the switches, fortunately not fatal to the switch. These all seem to be in excellent condition. Will check them out later.

author: sarel.wagner
author_rank: Regular Contributor
timestamp: March 26, 2020, 10:28:49 am
content: And the group pic....

author: sarel.wagner
author_rank: Regular Contributor
timestamp: March 26, 2020, 10:34:27 am
content: Now the hunt for a Null detectorPlease sell me one
Saving a position in Heather? - Page 1
Forum section: electronics / general

author: elroy
author_rank: Regular Contributor
timestamp: March 05, 2020, 06:33:58 am
content: I have a Trimble Thunderbolt that's been running for a few weeks now, and interfaced to Lady Heather for a few days. Everything looks good, except I notice the statement "No saved posn" appears in red. I've searched through the documentation I could find, and can't find a reference to this, or to a method for saving a position. Can this be done from Heather?

author: texaspyro
author_rank: Super Contributor
timestamp: March 05, 2020, 08:30:17 am
content: Try SL (set location). Or EE (update EEPROM)Saving the location on a Thunderbolt ven be a bit weird. The Tbolt command for setting the location only takes single precision numbers... which is not all that accurate. Heather's precision location survey code has a stupid hack to save a more precise location... it starts doing single point survey commands until one happens to produce a result within a meter or so of the desired location. This can take a few seconds... or days.

author: elroy
author_rank: Regular Contributor
timestamp: March 05, 2020, 05:55:37 pm
content: Quote from: texaspyro on March 05, 2020, 08:30:17 amThanks. When I searched on "location" rather than "position," I found the documenthttp://www.ke5fx.com/heather/heather.pdfwhich has some good info. Entering SL from the keyboard prompted it tot read the values determined from GPS, which were accepted ("Position saved" now in green). I also noted the option to specify values from the command line with "/po".
03458-66509 standalone operation? - Page 1
Forum section: electronics / general

author: Villain
author_rank: Regular Contributor
timestamp: February 21, 2020, 07:00:29 am
content: Hi,if I would want to operate the DC reference board of 3458A standalone, what would i need to consider? (not performance wise, but operational wise)The board is powered by +18V and -15V I saw in the data sheet, but what would i do with J401 (1) for example? I don't even know what its doing exactly.I am not very familiar with the architecture of the reference board or 3458A.And what does J400 (1) do?Maybe someone more experienced can help me out here.Thanks in advance.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 21, 2020, 09:15:20 am
content: The A9 board is pretty much the standard LTZ1000 circuit. The supply should not need +18 V for the positive side, 15 V and likely also 12 V should be sufficient. The 18 V are just the voltage present with the 3458.The -15 V should be reasonable close to get the ground current compensation working. If not needed it should also run without the -15 V supply.J400/J401 are the connectors. On the DMM / carrier board one would have some type of pin headers. To do the connections.The output of the normal LTZ1000 circuit is sensitive to overload, as this can lead to the heater going too high.So for use as a reference voltage source as an instrument one should add some protection in the form of a buffer amplifier. Given that one needs a buffer anyway, one could as well include the ref. circuit as well.

author: Villain
author_rank: Regular Contributor
timestamp: February 21, 2020, 09:32:04 am
content: I understand that these are the connectors but are pins (1) of J400 and J401 some kind of feedback loop for something or can i leave them unconnected for now and just power on the board without worrying too much?Thank you for taking the time to respond.

author: Kleinstein
author_rank: Super Contributor
timestamp: February 21, 2020, 10:49:05 am
content: The pins are just for the power supply and the output. There is no other external loop or connection needed. In the simplest case it would be a reasonable stable (e.g. 7815 regulator) +15 V to the pins for the supply and heater supply and the ground for the supply. The output is than from 7 V and the Ref. Zero pin. Just be aware not to shorten the output, as this would turn on the heater all the way. Even connecting a larger cap can be too much.
Line Voltages (New Construction) - Page 1
Forum section: electronics / general

author: itsbiodiversity
author_rank: Regular Contributor
timestamp: February 15, 2020, 02:41:29 pm
content: This may be rudimentary, but I noticed that a new facility that we just moved in to has a line voltage of 125V. I realize that is not "high", but how would that affect equipment? Should I contact the power company? I am concerned with the stability and long term health of my precious equipment.

author: KaneTW
author_rank: Frequent Contributor
timestamp: February 15, 2020, 03:22:06 pm
content: Likely completely fine. Equipment rated for 110V will work fine at that voltage, but double check the rating label on the back anyways.Once you load the mains a bit, the voltage will likely sag a few volt.

author: dropkick
author_rank: Contributor
timestamp: February 16, 2020, 06:08:55 am
content: The standard in the U.S. is 120V +5%/-5% and variations to -10% "should be limited in extent, frequency and duration." 125V is fine.I once had 132V at the house and that did qualify as a problem. The electric co. came out, measured 125V at the panel. The guy said "I wish my voltage was that good!". He left a datalogger on and did catch the +130V levels later on. They fixed it of course, somewhere out on the lines. They were working down the street a few days before.I bet it won't be 125V when summer rolls around

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: February 16, 2020, 05:18:04 pm
content: It's not unusual and in-spec (I think) but look at the life curve for incandescent bulbs sometime. You won't like what you see compared to 120 or below. OTOH, who uses those anymore?

author: David Hess
author_rank: Super Contributor
timestamp: February 16, 2020, 06:54:19 pm
content: Quote from: Conrad Hoffman on February 16, 2020, 05:18:04 pmI would going to mention that; incandescent bulb operating life is inversely proportional to the 16th power of the voltage.For instruments and motors where it matters, the transformer or motor will have several taps to adjust for the primary side voltage. For instance my Tektronix 7603 oscilloscope and TM series power modules have jumpers on the primary side of the their transformers.
HP5061 service note 5061B-02   FYI - Page 1
Forum section: electronics / general

author: lowimpedance
author_rank: Super Contributor
timestamp: February 21, 2020, 02:00:02 am
content: I found this service note in a folder of old service notes for various instruments and thought it may be of some interest to owners of the 5061.I did a quick search but could not find it archived somewhere else, so for reference info here it is.
AD588 Voltage Reference - Page 1
Forum section: electronics / general

author: Johnny10
author_rank: Frequent Contributor
timestamp: February 04, 2020, 01:23:07 pm
content: Listed as AD588 Multiple Output, High Precision, Dual-Tracking ReferenceI just purchased a couple of these in mil grade.And was looking for schematics I could use to build a battery operated Reference.I noticed that there is a design on the forum from many years ago.Any advice or direction for a 10V -10V build?Thanks

author: Andreas
author_rank: Super Contributor
timestamp: February 04, 2020, 07:53:29 pm
content: Hello,for +/- 10 V from the same device the AD688 is the better option.The AD588 is more for +/- 5V or a single -10V or single +10V(see data sheets)with best regardsAndreas

author: Johnny10
author_rank: Frequent Contributor
timestamp: February 04, 2020, 08:32:33 pm
content: I am wondering if it might not be better to make a Digital to Analog convertor with this chip?Looking over the datasheet it might actually be a better use.

author: guenthert
author_rank: Frequent Contributor
timestamp: February 04, 2020, 11:52:53 pm
content: Quote from: Johnny10 on February 04, 2020, 08:32:33 pmDunno, those references-on-a-chip have the general advantage over Zeners that they have a pretty well defined output voltage (small initial tolerance), which is what you want for mass-production. For small series, the additional labor of calibrating is less significant and hence initial tolerance irrelevant.For a DAC you typically don't care whether the reference voltage is exact 10V +/- 1mv or somewhere around 6.2V, but you might care about noise and there old style Zeners are still competitive (and much cheaper).A while ago, one could get fairly cheap 10V references (sold under the name KKMoon on fleebay) using the AD588 (not to be confused with the dirt-cheap ones using the AD584). I don't have access to mine right now, but it performed quite well, drifted about 2ppm against my HP34410A in the 18 months I monitored it (including a rather lengthy journey by ship half around the globe).
Is time-nuts list now closed to general public? - Page 1
Forum section: electronics / general

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: January 26, 2020, 10:03:23 am
content: Hastime-nuts listfinally closed its doors to non-members?QuoteLeo

author: mycroft
author_rank: Regular Contributor
timestamp: January 26, 2020, 11:44:34 am
content: I got this:Code:Not FoundThe requested URL was not found on this server.Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.I suppose it is just a temporary fault or configuration error.

author: ZigmundRat
author_rank: Regular Contributor
timestamp: January 26, 2020, 01:58:56 pm
content: I got the same message as Leo. I sent John a note.

author: BiggieJohn
author_rank: Newbie
timestamp: January 26, 2020, 06:10:08 pm
content: even if you are a member, all the attachment links are broken, so something is wrong

author: edpalmer42
author_rank: Super Contributor
timestamp: January 27, 2020, 03:27:29 am
content: There seems to be something wrong with the entire febo.com website. Everything is painfully slow.

author: Dr. Frank
author_rank: Super Contributor
timestamp: January 27, 2020, 10:04:05 am
content: The sister list 'volt-nuts' is not affected.But there, I also don't see the hint that it is restricted to members.The time-nuts list currently is only accessible for members with password, in the private area.Frank

author: artag
author_rank: Super Contributor
timestamp: January 27, 2020, 03:57:29 pm
content: This was posted recently to the list :The list archives were hit by a denial of services attack on Saturday, and our hosting company was forced to take the archives off-line because the load was crashing their server. We're going to bring them back either later today or tomorrow.

author: FenTiger
author_rank: Regular Contributor
timestamp: January 30, 2020, 09:43:31 pm
content: List subscribers: have you heard anything about when the archives will be back online? I was expecting to be able to get to them by now.

author: BiggieJohn
author_rank: Newbie
timestamp: February 02, 2020, 12:20:04 am
content: Update posted today by John Ackermann :"If you've been missing the time-nuts list archives for the last week orso, they have been turned back on.The archives were hit with a denial-of-service attack and our hostingcompany had to disable them because the traffic was crashing theirservers. Things have settled back down, so the archives have beenenabled again.Messages posted during the down time were added to the archives asnormal; the only thing that was affected was public access to thearchive pages.Sorry for the inconvenience."
Using keyboard to control Keysight DSO-X-2024A - Page 1
Forum section: electronics / general

author: aurelienr
author_rank: Newbie
timestamp: January 29, 2020, 10:01:47 am
content: Hello,I have this scope since several years (with latest firmware release), and I wish to control the triggers with a keyboard (in fact, an emulated keyboard with a foot pushbutton, mainly to control triggers while my hands are busy) . I've seen a keysight video where they show that, but it seems to be on DSOX3000 series. I tried to plug a keyboard on front panel and rear panel USB ports of my DSOX2000, no effect.Does anyone has a tip to control this scope externally ?ThanksAurelien
EZGBIP Program help please - Page 1
Forum section: electronics / general

author: jeremynichols
author_rank: Newbie
timestamp: February 08, 2020, 05:25:29 am
content: Some time ago, Guido posted a reply to an August 20, 2018 request, " Would some kind soul post a sample EZGPIB program." The OP was trying to read data from his HP-3456A DVM. I am unable to get Guido's program (below) to work. It compiles error-free but no data is retrieved from my 3456A. The only difference I can see is that the OP was using a Prologix GPIB-USB adapter and mine is GPIB-Ethernet. GPIB Configurator confirms that my 3456A can talk to the Prologix adapter and via that and the network, to my PC running EZGBIP (version 20121217). The only change I made to Guido's program was to change the GPIB address to 22 as used by my 3456A. Since I have no programming experience newer than Applesoft BASIC, I would appreciate some advice as to what I might be doing wrong.Here is Guido's program:Const Device = 22; // GPIB addressTimeout = 5; // timeoutVar Answer:string;begin; // mainEZGPIB_BusEnableEoi; // enable EOIEZGPIB_BusSetEos(0); // Append CR+LF to instrument commands; MODE 4EZGPIB_ScreenClear;repeatEZGPIB_BusWaitForData(Device,Answer,Timeout); // Wait for dataEZGPIB_ScreenWriteLn(Answer); // Write data to screenuntil ezgpib_kbdKeyPressed;end.

author: babysitter
author_rank: Frequent Contributor
timestamp: February 09, 2020, 04:02:56 pm
content: In the area between sourcecode and console you get debug messages. What happens there? Also, there is a "debug window" you can summon which should tell you about interfaces found - whats going on there? I have only the USB interface, but the website says GPIB-LAN is supported too.

author: jeremynichols
author_rank: Newbie
timestamp: February 10, 2020, 06:48:18 pm
content: There is no response in either window when I attempt to run the program. I'll attempt to find the "debug window" when my 3456A becomes available (it's tied up in another project).

author: babysitter
author_rank: Frequent Contributor
timestamp: February 10, 2020, 07:42:36 pm
content: The debug windows should tell you which Interface is found, even without further GPIB Bus members.

author: borghese
author_rank: Regular Contributor
timestamp: February 10, 2020, 07:48:17 pm
content: HelloIf your adapter is configured as a controller and the HP3456 is not in 'talk only' you must tell HP what to do.Try adding this line:repeatEZGPIB_BusWriteData(Device,'F1T1');// DCV and TriggerEZGPIB_BusWaitForData(Device,Answer,Timeout); // Wait for data

author: serg-el
author_rank: Regular Contributor
timestamp: February 10, 2020, 09:00:13 pm
content: https://wk.baidu.com/view/8433992e453610661ed9f417?pcf=2&re=viewhttps://xdevs.com/fix/hp3456a/#manualhttps://m.youtube.com/watch?feature=youtu.be&v=ASu6DuDdVmA

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: February 14, 2020, 02:32:37 am
content: I did have the EZGPIB program working recently and then it stopped working.The problem?I needed to run EZGPIBConfigurator from John Miles, seehttp://www.ke5fx.com/gpib/readme.htmto set Prologix's usb port, which apparently changed.Hope this helps,Randall
SM7050 Reference Standard Meter - Page 1
Forum section: electronics / general

author: fcb
author_rank: Super Contributor
timestamp: January 18, 2020, 05:11:59 pm
content: Anyone ever come across a Schlumberger SM7050 Reference Standard Meter? Just aquired a unit here, interested in finding out more before I tear it down for a closer look.

author: Vgkid
author_rank: Super Contributor
timestamp: January 18, 2020, 06:30:37 pm
content: Never heard of a sm7050, only the regular 7050.

author: fcb
author_rank: Super Contributor
timestamp: January 18, 2020, 09:23:26 pm
content: Defo not one of those. This thing looks like a double height 7081.

author: Vgkid
author_rank: Super Contributor
timestamp: January 18, 2020, 09:28:26 pm
content: Sounds interesting, definetly post up some pics.I did see it mentioned in an indonesian metrology paper.
Fluke 720A question - Page 1
Forum section: electronics / general

author: notfaded1
author_rank: Frequent Contributor
timestamp: February 02, 2020, 07:24:37 pm
content: I just acquired a 720A and was curious before I open it up if the serial numbers hint to the age? Mine is serial number 04016. Also there's an original Fluke sticker still on the top. Would this be from the original manufacture or later recalibration done by fluke? It looks more like original.Bill

author: notfaded1
author_rank: Frequent Contributor
timestamp: February 02, 2020, 07:27:46 pm
content: The sticker is right above the front left on top right front by the real serial number plate on front. I wonder if others have a sticker in the same place?
Are there dual mode SC-cut OCXO commercially available? - Page 1
Forum section: electronics / general

author: notfaded1
author_rank: Frequent Contributor
timestamp: January 08, 2020, 07:41:33 pm
content: I've been reading about these dual mode OCXO where a low-noise dual-mode SC-cut oscillator simultaneously excites C and B modes in 3rd overtone resonator. The research shows results demonstrating that the temperature frequency stability of the dual-mode OCXO is 60 times better than that of a free running OCXO. Does anyone know if these are commercially available? Attached is the full research about it from IEEE. A block diagram of the method is also linked here:https://www.researchgate.net/figure/Block-diagram-of-dual-mode-OCXO_fig2_267551968I'm by no means an expert on these but the technique seems really good for an ultra-stable OCXO. The compensated vs. free running OCXO difference in stability seems huge unless I'm missing something? I was curious if you can buy these from someone since the research is from 2000? Maybe no one here knows but I thought I'd ask since I know there are time-nuts here with orders of magnitude more knowledge than I have.Bill

author: Leo Bodnar
author_rank: Frequent Contributor
timestamp: January 08, 2020, 11:06:52 pm
content: I am surprised at their assertionQuoteIt sets the tone for the whole research.Would it not be better to get better components and more accurate temperature controller? I can imagine that if you stick a modern design - like IHR - in a double oven then you can achieve better stability than typical classic OCXO with less stress on the components.Conceptually, this dual mode idea might work, but repeatability will probably be awful - I reckon frequency difference between the modes will vary wildly in a batch - with spurious modes in the way and all over the place. This will probably make every oscillator into a unique hand-built part.And in the end all it solves is temperature stability [of sub-optimal operation point] and does not address ageing, contamination, frequency jumps, pressure dependence, etc.Leo
Difference between UCT 108663-01 and UCT 108663-02 - Page 1
Forum section: electronics / general

author: dnessett
author_rank: Regular Contributor
timestamp: December 24, 2019, 12:08:37 am
content: A supplier on ebay failed to ship some UCT 108663-01 DOCXOs to me that I purchased. As part of the resolution process, he offered to include an additional oscillator as compensation. However, when I received the shipment, the extra oscillator was a UCT 108663-02 rather than a UCT 108663-01. I have Googled both device numbers and found that both are for sale, but could not find the difference between them. When I tested the units they all provide a 10 MHz sine wave. So, I imagine the difference may have something to do with stability or perhaps the EFC tuning range (this is a pure guess).Does anyone have information on the distinction? The only spec sheet I could find is for the Oscilloquartz OCXO 8662/8663. Comments on the EEVBlog suggest the UCT is a rebranded Oscilloquartz, but the identification information is not the same.Thanks for any help.

author: tkamiya
author_rank: Super Contributor
timestamp: January 03, 2020, 06:53:51 am
content: I bought whole bunch of OSA 108663-01. I too, heard, they are renamed verison of Oscilloquartz units. These being and old stock and so many fakes around, I really don't know if caring too much about 001 and 002 is productive. Chances are, those are higher-spec units but I have no way to be sure of this. Really, only way to be semi-sure is to take a few and test them yourself.Very much pain in a butt but that the way it is on eBay sometimes.

author: FransW
author_rank: Frequent Contributor
timestamp: January 04, 2020, 11:51:26 am
content: The UCT 108663 seems to take more time to stabilize.See:http://www.miedema.dyndns.org/co/2019/ocxo/MasterClock2-met-UCT-OCXO-koude-start-1000pix.pngand:https://www.circuitsonline.net/forum/view/143072/3#highlight=01+uct%200Text is unfortunately in Dutch.If required, I can translate.Frans
Efratom rubidium oscillator #102100-001 - Page 1
Forum section: electronics / general

author: Grandchuck
author_rank: Super Contributor
timestamp: December 29, 2019, 06:23:03 pm
content: Can anybody help me find information on this unit.Thanks and Happy New Year to all!

author: tkamiya
author_rank: Super Contributor
timestamp: January 01, 2020, 11:42:20 pm
content: Can you post a photo from all angles?Often, Efratom units comes in larger case with buffer amp, etc, and INSIDE IT is the real Rb oscillator. While I don't suggest randomly taking it apart, some of us can often recognize placement of connectors, etc, and suggest you should do so.

author: Grandchuck
author_rank: Super Contributor
timestamp: January 02, 2020, 02:42:29 pm
content: Thank you for the reply. Here is one shot.

author: tkamiya
author_rank: Super Contributor
timestamp: January 02, 2020, 02:53:15 pm
content: If you google Efratom 102100, there are inside photograph of it. I think it is a custom spec version of FRS-C. If you take the outer most heatsink, there should be another heatsink. Then outer cover should slide off. It is a very early version of Efratom.

author: Grandchuck
author_rank: Super Contributor
timestamp: January 02, 2020, 05:39:03 pm
content: I cannot access the photos. Permission is needed.

author: tkamiya
author_rank: Super Contributor
timestamp: January 03, 2020, 06:42:22 am
content: That's odd. I can see it perfectly. I'd bet if you take it a part as far as you are comfortable, you will find a module you can easily look up on internet. Efratom made lots of custom made unit for military. They are usually with unique ID number and information released to public is almost zero.
Fluke 5700A fans - Page 1
Forum section: electronics / general

author: jfphp
author_rank: Regular Contributor
timestamp: December 18, 2019, 04:11:40 pm
content: I am looking for the manufacturer and part number of the fans in a 5700A first generation (unable to find in the parts section of the repair manual !). Thank you.

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 18, 2019, 04:13:42 pm
content: Should be listed on the fan itself, no?

author: jfphp
author_rank: Regular Contributor
timestamp: December 18, 2019, 05:46:50 pm
content: Of course no in my case, that is why the question...

author: Ice-Tea
author_rank: Super Contributor
timestamp: December 18, 2019, 07:48:26 pm
content: No markings at all? Not even embossed in the plastic? Anyways, fans have pretty standardized dimensions. Measure diameter and voltage and it should be easy enough to find something..

author: TiN
author_rank: Super Contributor
timestamp: December 19, 2019, 04:37:04 am
content: There is a pic with fan label onTodd's 5700A repair article. I tend to replace fans with slightly faster/noisier fans to get unit more comfortable. Fans, capacitors, carbon resistors replacement are just go to procedure on any expensive R&M device older than 10 years. Relays are consumables as well for stuff like scanners/calibrators, and so on.

author: SometimestheDragonWins
author_rank: Newbie
timestamp: December 29, 2019, 07:28:47 pm
content: Ill go open up mine and check it out, give me an hour or so and ill be back
Anyone close to Orange County with 3458A or equivilent - Page 1
Forum section: electronics / general

author: mp006ltk
author_rank: Newbie
timestamp: December 27, 2019, 11:03:55 pm
content: Hi all,I need two DIY resistance standards measured. Is there anyone near OC, CA with an 8.5 dig meter in calibration that would be willing to make 2 measurements?Thanks!

author: Tony_G
author_rank: Super Contributor
timestamp: December 28, 2019, 12:10:11 am
content: My unit has just gone out of calibration (11/30/19) as I'm shifting to getting a true standards cal done every 3 years now. If that doesn't bother you and you don't get a better offer I'm up here in Seattle so you could mail me the units and I'll check them for you. Let me know.TonyG
Some ADEV measurements for Star4+ GPSDO at different time constants - Page 1
Forum section: electronics / general

author: jpb
author_rank: Super Contributor
timestamp: January 02, 2020, 02:10:11 pm
content: I have two Star4+ GPSDOs and have been measuring them against each other.I thought the following results would be of interest to others wishing to know what time constant to set (with the &t command in Lady Heather).The range of time constant that can be set is 10 seconds to 5000 seconds. I've previously been running them at 5000 seconds but as the result of these tests I think perhaps 3000 seconds is a better number.In each case both GPSDOs were set to the same time constant. I tried to go down to 10secs but the results were rather messy so I made the minimum 100 seconds. At this time constant you get a good impression of the GPS curve (line). Other results are at 1000 secs, 2000 secs and 5000 secs.At the longer time constants my system isn't good enough to measure the ADEV at low values of tau (I've plotted the noise floor line as well).There is a definite trade-off, if a very long time constant is set (5000 secs) then the short term ADEV is very good (basically that of the OCXO in an undisturbed state) but then the curve over-shoots the GPS line so results aren't so good at longer tau.The default time constant is only 200 seconds which I'd say is far too short.NB the results are for the two GPSDO combined, if the two are equal (which I suspect they are not) then the results should be divided by sqrt(2) to give an estimate for an individual GPSDO.
tempting 3458A but... - Page 1
Forum section: electronics / general

author: notfaded1
author_rank: Frequent Contributor
timestamp: December 13, 2019, 04:50:26 pm
content: https://www.ebay.com/itm/1-pc-NOT-working-HP-3458A-Multi-meter/143463604365What are the chances the A3 board needs to be replaced? Or could just replacing U405 EL2018 maybe a be a fix... hard to guess? All the seller will say error is:- Self test failed & ACAL failure. Error message shown (209,HARDWARE FAILURE ----TIMEOUT UNABLE TO READ A/D : 72 )Does anyone know how old SN:2823A09836 is for a 3458A?Bill

author: Dr. Frank
author_rank: Super Contributor
timestamp: December 13, 2019, 07:07:01 pm
content: I estimate that it's from around 1995.

author: MiDi
author_rank: Frequent Contributor
timestamp: December 13, 2019, 07:41:18 pm
content: First HP with A3black insideIf you have luck, there is just something wrong with the fibre optical path...

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: December 13, 2019, 08:24:13 pm
content: I'm always afraid things like this could be missing a whole circuit board and you'd have no recourse.

author: RandallMcRee
author_rank: Frequent Contributor
timestamp: December 13, 2019, 08:35:59 pm
content: Quote from: Conrad Hoffman on December 13, 2019, 08:24:13 pmYeah, just that. In non-working condition you would think that an inside shot would be mandatory.

author: guenthert
author_rank: Frequent Contributor
timestamp: December 13, 2019, 08:38:51 pm
content: Given the pictures, I'd be willing to give the benefit of doubt and assume it's complete. I'd rather be afraid that even after 'fixing' it, it'll drift. And what's a drifting (even if it'll be difficult to tell) long-scale meter worth to you? But then, I'm no expert in fixing precision measurement tools and can't assume that I could fix it, when the current owner couldn't.

author: ap
author_rank: Frequent Contributor
timestamp: December 14, 2019, 05:55:12 am
content: My personal experience with used 3458As, and it has been many, early and later models, ball park 50% allone have an A/D drift issue... Other issues add.

author: ScoobyDoo
author_rank: Regular Contributor
timestamp: December 14, 2019, 09:40:48 am
content: A fresh tested (but refurbished) A/D CNV (A3) board (03458-69503) would cost 755 euros + VAT.There is also risk you need to solder new DALLAS SRAM back up batteries on A5 board (without loosing CAL constants)

author: IanJ
author_rank: Unknown
timestamp: December 14, 2019, 06:00:39 pm
content: Hi all,Before parting with a lot of money for this IMHO it's best to contact the seller and ask questions. If they respond accordingly it can help build up a level of trust.Ask for photos of the internals.Ask for the history of the unit, at the very least the most recent history.etc...etc...I did it with a faulty unit from the Phillipines from somebody I didn't know and it all turned out quite well.Ian.
Guildline 4281-G volt ratio box - Page 1
Forum section: electronics / general

author: ArthurDent
author_rank: Super Contributor
timestamp: December 12, 2019, 08:07:32 pm
content: While this instrument may not be a great find, getting this Guildline 4281-G volt ratio box for $25 at a surplus store was something I just couldn't pass up. Now to just find a good use for it...

author: Vgkid
author_rank: Super Contributor
timestamp: December 12, 2019, 11:28:28 pm
content: Thanks for the teardown. 10 Watts dissapated at full voltage
Chauvin Arnoux F205 calibration - Page 1
Forum section: electronics / general

author: Szybkijanek
author_rank: Contributor
timestamp: December 11, 2019, 08:19:30 pm
content: Hi,I need help calibrating the meter from the topic. I have originally manual but one of the sections in the manual refers to the empty chapter which is calibration. There is nothing about her. Does anyone know what the procedure looks like, what is the key combination? The meter manual is attached.
Fluke and those silly SI-units  - Page 1
Forum section: electronics / general

author: mzzj
author_rank: Super Contributor
timestamp: December 05, 2019, 08:58:23 am
content: https://www.fluke.com/en-us/product/calibration-tools/pressure-calibrators/fluke-717#If you look closely the front shows max 6000 PSI 41.4mPa (millipascals instead of megapascals)Manual is not any better, millipascals againhttps://dam-assets.fluke.com/s3fs-public/717_____iseng0200.pdfToo much to ask that Fluke knows the difference between Mega- and milli-

author: SilverSolder
author_rank: Super Contributor
timestamp: December 06, 2019, 12:55:43 am
content: Many companies have a way to give documentation feedback - pretty sure an organisation like Fluke would.Have at it!

author: I wanted a rude username
author_rank: Frequent Contributor
timestamp: December 06, 2019, 01:59:28 am
content: That does not seem fit for purpose.For instance, if you find yourself in court having to prove that you were doing due diligence by regularly monitoring a system's pressure, measurements you logged with this device may get thrown out.

author: mzzj
author_rank: Super Contributor
timestamp: December 06, 2019, 06:01:11 am
content: Quote from: SilverSolder on December 06, 2019, 12:55:43 amSeem to be re-occurring problem in many(all?) of the 700 series pressure calibrator manuals.This is wrong and ugly on many levels, like stating operating pressure in kPa and maximum pressure in MPa in the meter front. Usually preferably to stick to one unit and use it consistently.

author: Jeroen3
author_rank: Super Contributor
timestamp: December 06, 2019, 09:58:17 am
content: Obviously the PSI rating is wrong.

author: Kleinstein
author_rank: Super Contributor
timestamp: December 06, 2019, 12:40:35 pm
content: This reminds me to the 60000 mHz CPU (coffee processing unit).
Gold plated spade lugs - Page 1
Forum section: electronics / general

author: Vgkid
author_rank: Super Contributor
timestamp: December 02, 2019, 03:27:19 am
content: Has anyone done any tedting, or know of some decent gold plated copper spade lugs.

author: Manteroy
author_rank: Newbie
timestamp: December 03, 2019, 07:33:22 am
content: I love it so much If it is useful and knowledgeable, then this is my first place to come.

author: branadic
author_rank: Super Contributor
timestamp: December 03, 2019, 06:07:24 pm
content: They are available at Wekomm.-branadic-

author: maat
author_rank: Regular Contributor
timestamp: December 03, 2019, 11:29:29 pm
content: You might want to check out ab-precision:https://www.ab-precision.de/products/cables-accessories/

author: andy3055
author_rank: Super Contributor
timestamp: December 03, 2019, 11:53:58 pm
content: Crutchfield:https://www.crutchfield.com/S-BAaR63rTbuw/p_074TB12/Speaker-Wire-Terminals-Black.htmlParts Express:https://www.parts-express.com/gold-spade-lug-crimp-terminal-14-12-awg-8-2-pair--095-672?gclid=EAIaIQobChMI6bDazdWa5gIVkONkCh0_qwfxEAMYASAAEgIPPvD_BwE

author: Vgkid
author_rank: Super Contributor
timestamp: December 05, 2019, 06:29:04 pm
content: The only downside to the audio offerings is that they don't say how/what the base metal is.Or if they do specify copper, the sizes are large.

author: Kosmic
author_rank: Super Contributor
timestamp: December 06, 2019, 02:57:03 am
content: This seller on taobao is selling copper spade lugs. Plus some other interesting items. It's a pita to use the translator in order to purchase something, but it's doable.https://xuanyiled.world.taobao.com/?spm=a312a.7700824.w1002-1801570747.2.68bb332cluR2ryBought some couple months ago. They are in real copper and quality is fine.
Means of measurement to control serigraphy stencils - Page 1
Forum section: electronics / general

author: Majdi4
author_rank: Newbie
timestamp: November 24, 2019, 06:31:54 pm
content: Hello Guys,I'm new here. I am smt process engineer in a company located in Tunisia. I am looking for a means of measurement to control: thickness of serigraphy stencils , dimensional measurement of apertures .STENCILS with stainless steel material. Am looking for a precise measurment mean.I will be waiting for your suggestions. THNX.

author: branadic
author_rank: Super Contributor
timestamp: November 24, 2019, 10:22:57 pm
content: What is wrong using a micrometer gauge?-branadic-

author: Majdi4
author_rank: Newbie
timestamp: November 25, 2019, 07:01:23 am
content: you have to cut some of the stencil to do the thickness control. It is not fesaible .
Fluke 5820A Scope Calibrator (Battery?) - Page 1
Forum section: electronics / general

author: Scopetechniques
author_rank: Contributor
timestamp: October 21, 2019, 02:55:52 pm
content: Hello,Looking at the Fluke 5820A Scope Calibrator I see nothing in the Service Manual about renewing a battery that maintains the date and time.The 5820A does keep date and time when it is turned off, this means it must have a battery somewhere. Whether it is a standalone battery or a timekeeper module (like MAXIM), these will eventually need replacement. I'm surprised Fluke does not document this in the service manual.I have had my 5820A completely apart (except the keyboard) to correct other problems and I have not seen a battery or a timekeeper module. Does anyone know where the data/time is held in the 5820A?Thank you,Victor Silva

author: Scopetechniques
author_rank: Contributor
timestamp: November 22, 2019, 08:33:34 pm
content: I posted this question many forums and no one replied. Probably due to the fact that this instrument is not very common or that the battery inside hasn't died yet.I any case, I submitted a technical request to Fluke and they have responded that there is a battery installed on the A9 front panel assembly--Victor
Datron 4708 33K, NAVAIR or TM cal procedure - Page 1
Forum section: electronics / general

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: October 28, 2019, 04:55:41 pm
content: Hello;Does any one have a copy of the cal procedure for a Datron 4708. 3TO 3K8-4-1027-1 is the USAF one, I don't know if there were a NAVAIR or TM one.Thanks!

author: jfphp
author_rank: Regular Contributor
timestamp: October 30, 2019, 11:05:44 am
content: Try the PMEL forum.

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: October 30, 2019, 02:49:43 pm
content: Thanks for the reply! I have tried them, no luck except to join GIDEP which my employer does not see the value.

author: PaulBG
author_rank: Newbie
timestamp: November 12, 2019, 08:48:31 pm
content: Here is a link to the full Datron 4708 Manuals which include the verification procedure, calibration procedure and servicing information. - Paulhttps://www.dropbox.com/sh/hc7k4l92k65q7cu/AABEdNhPzHNA3gcCrPyn_3Kga?dl=0

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: November 13, 2019, 03:59:10 am
content: Thanks!
Burster 1423 decade resistor - Page 1
Forum section: electronics / general

author: doktor pyta
author_rank: Frequent Contributor
timestamp: November 15, 2019, 10:28:45 pm
content: Why my new Burster 1423 opt GPIB is so heavy?I asked myself this question while carrying it to the lab.The answer is on the pictures below.Six powerful servomotors inside.

author: Huluvu
author_rank: Regular Contributor
timestamp: November 16, 2019, 07:40:42 am
content: Yes I was wondering too why this device is soo heavy (I have the same)

author: HighVoltage
author_rank: Super Contributor
timestamp: November 16, 2019, 12:06:11 pm
content: How interesting!Do you have a service manual for this decade?How accurate is it still ?

author: doktor pyta
author_rank: Frequent Contributor
timestamp: November 16, 2019, 12:22:19 pm
content: I don't have service manual.Only operation manual (attached below).At least I'm able to set values using GPIB.It is very loud while changing positions.My unit is made in 1995.Resistance values are within specs, typically within half of specified tolerance.Best Regards

author: HighVoltage
author_rank: Super Contributor
timestamp: November 16, 2019, 02:53:16 pm
content: Nice, thanks for the manualI expected this decade to be in specs, even after so many years.The resistor material on this 1423 isZeraninand Burster used it in those days for their high end resistors.They stopped using Zeranin after it became unobtanium.Their 1284 series fixed resistors were also made out of Zeranin.

author: Gyro
author_rank: Super Contributor
timestamp: November 16, 2019, 04:44:22 pm
content: It looks like pretty much the ideal resistive material. Low TC, low thermal EMF against copper andsoft solderable.https://www.isabellenhuette.de/en/precision-alloys/products/zeraninr/
1968 Perspective - Page 1
Forum section: electronics / general

author: IconicPCB
author_rank: Super Contributor
timestamp: August 07, 2019, 10:48:26 pm
content: I was going through the library looking for an old copy ( 1963? ) of Motorola Transistor Handbook when i came across what follows.Sadly Motorola book is no longer there ( i must have thrown it out in one of those google induced moments of madness ) however the seminar notes are "virgo intacta", nicely bound and legible.

author: Conrad Hoffman
author_rank: Super Contributor
timestamp: August 07, 2019, 11:14:56 pm
content: I think I had a 735. It was pretty awful and the oven was disintegrating. Might still have the manual.

author: IconicPCB
author_rank: Super Contributor
timestamp: August 07, 2019, 11:19:46 pm
content: one more time... with feeling

author: IconicPCB
author_rank: Super Contributor
timestamp: August 09, 2019, 11:23:16 pm
content: continuation

author: IconicPCB
author_rank: Super Contributor
timestamp: August 09, 2019, 11:41:26 pm
content: Final notes... pages 15 to 20.The booklet does however contain brochures and app notes of the day.

author: alm
author_rank: Super Contributor
timestamp: September 07, 2019, 07:07:17 pm
content: I uploaded a PDF with all pages combined to TiN's documentation site as described here:https://doc.xdevs.com/contact/

author: ArthurDent
author_rank: Super Contributor
timestamp: September 07, 2019, 07:42:08 pm
content: I still use some of the instruments shown, like my HP735A from 1966 and the HP419A, and they work just fine. Here's a link to the HP419A in action just a couple of weeks ago plus a couple of photos of my transfer standard and meter.https://youtu.be/wTGxBJNNhWc

author: RolandK
author_rank: Regular Contributor
timestamp: December 06, 2019, 05:31:24 pm
content: All sides in one PDF File.
Make your own Rubidium-stabilized OCXO reference - Page 1
Forum section: electronics / general

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: November 06, 2019, 10:30:29 am
content: Anyone here know of people who have tried this in a more diy-context? I imagine that by far the hardest part here is the sourcing of the rubidium itself?Some colleagues and I are looking at giving this a shot for our 'project friday' workdays. This does mean we have access to some good equipment from T&M point of view.

author: FriedLogic
author_rank: Regular Contributor
timestamp: November 06, 2019, 12:00:17 pm
content: How 'DIY' are you thinking of?If you're starting off with a few bits from an old rubidium it's one thing, but trying to make the cell is something else.

author: ogden
author_rank: Super Contributor
timestamp: November 06, 2019, 12:35:28 pm
content: Quote from: TheUnnamedNewbie on November 06, 2019, 10:30:29 amYou want to DIY-manufacture rubidium gas-cell frequency standard? This:

author: awallin
author_rank: Frequent Contributor
timestamp: November 06, 2019, 04:55:42 pm
content: Quote from: TheUnnamedNewbie on November 06, 2019, 10:30:29 amthese may or may not be suitable..https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=1470600 to 900eur, they seem to have both 'natural' (mostly Rb85 I guess) and Rb87.There are some all-optical Rb-clock setups, where you only need 780nm light (frequency doubled 1560nm telecom laser) - which might be worth a look?

author: doktor pyta
author_rank: Frequent Contributor
timestamp: November 06, 2019, 06:49:33 pm
content: good luckhttps://www.ebay.com/itm/Rb-High-Precision-Low-Phase-Noise-Rubidium-Atomic-Clock-Soviet-Ussr-DIY/123737315177?hash=item1ccf519769:g:~K0AAOSw0VBctceW

author: maat
author_rank: Regular Contributor
timestamp: November 06, 2019, 10:32:23 pm
content: Quote from: awallin on November 06, 2019, 04:55:42 pmIf you want to go the laser route. Check out Eagleyard Photonics (https://www.eagleyard.com/products/single-frequency-laser-diodes/) and their DFB diodes, but don't expect this route to be cheap. Better, but certainly not cheaper than a brand new PRS10.

author: edpalmer42
author_rank: Super Contributor
timestamp: November 07, 2019, 02:56:52 am
content: Quote from: doktor pyta on November 06, 2019, 06:49:33 pmIf this turned out to be a combined cell rather than a seperate resonance cell or filter cell, that would be a huge stroke of luck. I thought I read something about someone evaluating these cells, but I haven't seen any results.Ed