hybridfree/eevblog-posts huggingface dataset:
DIY TG for HP8568B - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: October 11, 2018, 12:19:25 am
content: Hello folks. I'm considering a DIY of tracking generator for my HP8568B. There are many pages for DIY TG but all are dealing with HP8566, not 8568.Looking at HP8568B documentations and also HP8444A with option 58/59, I am quite confused partly because both documentation covers multiple models with slightly different schemes. Especially the doc for SpecAn contains left over verbiage from HP8566B. So if someone can help me clear up my thoughts, I'd be appreciative. Initial order of things to do is to get frequency relationship correct.If there are any errors in the following, please point that out.1) Local out from SA is 2.0 to 3.7GHz, at +4dbm. (1.7GHz bandwidth??)2) TG expects 500MHz and it mixes with 1.55GHz +/- 2Mhz (adjustment range) internally to produce 2.05GHz.3) They both mix to create 0 to 1.5GHz range. Actually, TG documentation shows mixer taking in 2 - 3.4GHz and 2.05GHz +/- 2Mhz and producing 0 - 1.35GHz. (huh? the math is 50MHz off)Here, math already doesn't make sense. Diagram is pretty explicit about 1.55GHz and 500Mhz. That will generate 2.05GHz. If I mix this with 2.0GHz, I get 50MHz. HP8568B starts from 100Hz. So one of them has to be off. But which? I'm quite surprised that HP8568B can actually tune up to 2.49GHz. (same as 8566) with much reduced RX sensitivity. THAT, combined above mentioned frequencies, range doesn't make sense.I've read Kerry Wong's excellent Blog few times but his is 8566B. As I understand it and having brief time with few units, I see they are quite different.

author: tkamiya
author_rank: Super Contributor
timestamp: October 11, 2018, 01:12:12 am
content: I just found out a recently acquired frequency counter actually can go up to 3GHz, so I measured the 1st LO output.At 0Mhz and no scan, 2.053GHzAt 0.5GHz and no scan, 2.553GHzAt 1GHz and no scan 3.053GHz.It appears the LO is actually from 2.053GHz, rather than 2.0GHz.
(For USA) Acme Tools 15% Off one item. - Page 1
Forum section: electronics / testgear

author: shteii01
author_rank: Frequent Contributor
timestamp: October 10, 2018, 02:13:50 am
content: I don't think they will sell international.https://www.acmetools.comEnds 10/10/18Promo code at checkout: crushedConditions:https://www.acmetools.com/shop/tools/promotions#FallSaleFree shipping on orders of 49+ USD.If someone looking for Fluke or some other stuff, might be a good deal.
HP 5328A Freq. Counter upgrade - Page 1
Forum section: electronics / testgear

author: Doogs
author_rank: Contributor
timestamp: October 05, 2018, 08:45:33 pm
content: Hi All:Noob around here so bear with me. I just purchased a barebones 5328A and I would like to upgrade it as much as I can. I've been googling my butt off and hitting the auction sites looking for parts and manuals but quite frankly it's a little confusing with the different boards and a lack of a knowledge base to work from. Anyway so here I am asking the gurus how to go about this project and if you could point me in the right direction.

author: joeqsmith
author_rank: Super Contributor
timestamp: October 05, 2018, 10:48:30 pm
content: I still use this counter. The manuals for it should be on-line. By upgrade I assume you want to add some of the options.Do you have some specific question/s about the the options that were available? If so, maybe I can help.

author: Stray Electron
author_rank: Super Contributor
timestamp: October 06, 2018, 04:57:42 pm
content: I assume that you've seen this <http://blog.thelifeofkenneth.com/2012/04/hp-5328a-universal-counter-teardown.html>. We need more information about what you're looking for.

author: Doogs
author_rank: Contributor
timestamp: October 07, 2018, 12:59:39 pm
content: Hello Stray Electron:See my reply to Joe for some clarification.;DThanks for the reply

author: Doogs
author_rank: Contributor
timestamp: October 07, 2018, 04:17:28 pm
content: My reply to Joe seems to have dissipated into the ether but anyway. after checking out Stray Electrons link which I did see earlier but somehow skipped the critical parts there is no practical or financial reasons to upgrade my unit as it would need far more work than just buying a different piece of equipment (Boy was that ebay ad way off on the description! Fortunately after communicating with the seller they have refunded the full amount less shipping and let me keep the counter). I may go for the precision oscillator option as I found a couple on ebay for $100 or so.I appreciate the replies guys and I'm sure I'll have a lot more questions going forward so hopefully I won't wear out my welcome.
oscilloscope recording software - Page 1
Forum section: electronics / testgear

author: stern0m1
author_rank: Contributor
timestamp: October 07, 2018, 12:42:04 am
content: Hi,What good software for windows is there that works with the RIGOL DS1054Z that will let me continuously record?I dont see that capability with Rigols ultrascope software.Thanks

author: DaJMasta
author_rank: Super Contributor
timestamp: October 07, 2018, 01:29:08 am
content: The problem is that the USB bus you'd connect it over doesn't have nearly the bandwidth to transfer that data, so unless your sample rate is extremely low (a few ksample/sec), you'd never be able to transfer the data quick enough through the connection.

author: stern0m1
author_rank: Contributor
timestamp: October 07, 2018, 01:42:22 am
content: ok, Is there any software at all available for low sample rate?

author: MrW0lf
author_rank: Frequent Contributor
timestamp: October 07, 2018, 07:37:28 am
content: Quote from: DaJMasta on October 07, 2018, 01:29:08 amThat's not strictly correct in broader sense, bus as such can do at least some tens of MSa/s with USB 2.0 and some hundreds MSa/s with USB 3.0 and it does with some scopes.

author: mk_
author_rank: Regular Contributor
timestamp: October 07, 2018, 09:04:36 am
content: http://peter.dreisiebner.at/rigol-bildschirmkopie/index.htm

author: abraxa
author_rank: Frequent Contributor
timestamp: October 07, 2018, 02:53:26 pm
content: sigrok is also an option.

author: joeqsmith
author_rank: Super Contributor
timestamp: October 07, 2018, 03:21:51 pm
content: I tried to look up the specs on the scope you mention. From what I saw, they basically just claim it has USA and Ethernet. I was not able to find any further details.LabView has support for both Ethernet and USB. Maybe Rigol has support for it already.I use LabView a fair amount to automate tests I want to run. To give you some idea, this video shows me using LabView with one of my scopes to measure AC power.https://youtu.be/04I7nHA_HxM?list=PLZSS2ajxhiQBcHhIaGpmm9GyZQfrCzqkvSparkfun used to offer a base package of LabView with some small micro board for $50. The software was watermarked but other than that it was the same as what you would buy. I know a few people who bought that package for Labview and tossed the micro board.
How to interpret HP 1141A max voltage specs?  - Page 1
Forum section: electronics / testgear

author: _Wim_
author_rank: Super Contributor
timestamp: October 07, 2018, 08:35:00 am
content: Hi, I acquired and 1141A (and 1142A) recently, but the probe came without the attenuators or AC-coupler. Attached is a couple of screenshots of the main specifications.Maximum Input Voltage:Am I correct saying the probe without attenuator withstands (iow before damage) max 200Vdc+ac to 200kHz? This max voltage is referenced to ground, and is for both the + and – input (so it can be common or differential). Above 200kHz this rating drops to max 5Vp at 7Mhz. If this is correct, the risk of actually damaging the probe seems quite ok, even without attenuator.Differential Input Range:Max measured differential signal is 300mVpeak for the complete frequency range. Above that the signal clips or distorts? Why is there the additional note 1 “For maximum signal fidelity above 100 MHz, limit the probe input (without attenuators to 300 mV)”? Does this mean that even with the attenuators the differential signal must be limited to 300mV peak to avoid distortion? The specs for 10x and 100x above 30Hz contain a typo, right? (mV must be V)Common-mode Operating Range:What is exactly meant with the common mode operation range of 0.5V between 30Hz and 200Mhz. Does this mean the CMRR will be lower than what is shown in figure 3-1 if the common mode signal goes above 0.5V? But at 200Mhz the CMRR is only 1/10, so a common mode signal of 0.5V will already give 50mV of noise, so surely not very useable any longer here? Or is there a risk of damage is the common mode signal goes above 0.5V (that would then be contradictory to figure 3-2). This spec I find the most confusing.This is probably obvious for many, but it is confusing me and would like to prevent damage to this probe.

author: Kleinstein
author_rank: Super Contributor
timestamp: October 07, 2018, 10:02:53 am
content: The 200 V limit seems to apply to the probe without attenuator. But be aware that it is AC peak. So more like 140 V RMS if a pure sine.The < 300 mV note for > 100 MHz likely applies to the common mode signal, because the CMRR is not that good anymore at high frequency.I agree with the typo for the 3 mV/30 mV limit for the case with attenuator, but without the attenuator it does not really matter.The common mode operating range applies to getting more errors when leaving this range, not damage.

author: _Wim_
author_rank: Super Contributor
timestamp: October 07, 2018, 10:10:02 am
content: Quote from: Kleinstein on October 07, 2018, 10:02:53 amThanks for your reply. Yes, I know it is AC peak, but still, 200V is quite ok. My main goal for this probe is powerrail noise measurement, so 200V peak is quite enough. I have no intention to probe mains voltage or something like that...
R&S SMG / SMH RF signal generator N-type output connector replacement  - Page 1
Forum section: electronics / testgear

author: bd139
author_rank: Super Contributor
timestamp: October 06, 2018, 04:17:21 pm
content: Seen a couple of these floating around for reasonable money but the N type connectors may have been dinked badly. The BNCs are a write off. Does anyone know if they are connected directly to the attenuators on the output or via hard line etc? Trying to work out if it’s even worth buying one as a repair project.I have the full service manual but no pictures of the construction.
Help with voltmeter selection - Page 1
Forum section: electronics / testgear

author: wave
author_rank: Newbie
timestamp: October 05, 2018, 05:15:26 pm
content: Hello everyone!I'm working on some condenser microphones and I need some advice about using a DMM or maybe some guidance to a different meter for measuring the high impedance areas in the units.Specifically the polarization voltage at the microphone capsule. My standard Fluke DMM loads these points down so I can't get a "real" reading and I just can't seem to research this and figure it out on my own...I need some help!!!!Thanks,Dave

author: HKJ
author_rank: Super Contributor
timestamp: October 05, 2018, 07:29:04 pm
content: That sound very expensive to measure, you need an electrometer!All normal mutimeters are around 10Mohm input impedance, bench meters can bemuchhigher at low voltage (<10V more or less). When you need to measure higher voltage without loading the source it is expensive.

author: wave
author_rank: Newbie
timestamp: October 05, 2018, 08:16:31 pm
content: Thanks HKJ,Yeah I kinda figured that was one of the possibilities. I bought an old Keithly 610BR from ebay but it needs some love.I don't have the money to buy a new electrometer. Are there any tricks with using a regular 10M input DMM and maybe a series resistor + math?Thanks,Dave

author: HKJ
author_rank: Super Contributor
timestamp: October 05, 2018, 08:26:56 pm
content: The idea behind measuring high voltage without loading it is to have a high voltage source and measure the voltage between the source and the unknown voltage, when it is zero, you can just measure your high voltage source.This is how a electrometer works and you can do it without a electrometer if you have a adjustable high voltage source and the patience to do it.
Fluke T6-1000 - Page 1
Forum section: electronics / testgear

author: PowerNet
author_rank: Regular Contributor
timestamp: October 04, 2018, 02:24:23 am
content: Has anyone use this tester and how it is ?Key featuresBe safer: Measure voltage to 1000 V ac through the open fork, without test leads.Be faster: No need to open covers or remove wire nuts.Be more efficient: Simultaneously measure voltage and current.Be everywhere: 17.8 mm open fork is widest in the industry; measure up to 200 A on 4/0 wires (120 mm2).Go beyond simple detection. Actually measure ac voltage and current values without test leads.Thanks

author: retiredcaps
author_rank: Super Contributor
timestamp: October 04, 2018, 04:59:56 am
content: Quote from: PowerNet on October 04, 2018, 02:24:23 amDiscussion athttps://www.eevblog.com/forum/testgear/fluke-fieldsense-contactless-voltmeter/?all

author: tautech
author_rank: Super Contributor
timestamp: October 04, 2018, 06:13:08 am
content: A real good look at the T6 starts here:https://www.eevblog.com/forum/testgear/hear-kitty-kitty-kitty-nope-not-that-kind-of-cat/msg1519018/#msg1519018Joe did at least 3 videos on it.

author: joeqsmith
author_rank: Super Contributor
timestamp: October 04, 2018, 05:07:51 pm
content: The non-contact voltage measurement IMO, is just not robust enough. For get the AVE part where he tries to use it with a current clamp adapter. The meter seemed to work well until I applied some perturbed waveforms. I tried some phase to phase measurements with a VFD that was running at a fairly high frequency and could not get the meter to read. After adjusting the carrier to a much lower frequency, the meter would work just fine.I made a playlist for the T6. You may find that here:https://www.youtube.com/playlist?list=PLZSS2ajxhiQBz1fid9OiPNw0gVodm3eeVI did try to test the current through the meter various ways. At one point I placed my hand in series with the meter while I pushed it to where it starts to conduct.... Don't try this experiment at home!!!https://youtu.be/k8hhtTtWfVc?list=PLZSS2ajxhiQBz1fid9OiPNw0gVodm3eeV&t=2590
SIGLENT SDG6000X Quick&Dirty Setup for Complementary PWM  - Page 1
Forum section: electronics / testgear

author: Le_Bassiste
author_rank: Frequent Contributor
timestamp: September 28, 2018, 08:17:10 pm
content: needed a two channel complementary PWM with dead-time insertion to do some testing on a halfbridge switch-mode power stage.although the SDG6000X (or SDG6022X for that matter) has two channels that can be set up for PWM individually, there's no straightforward way to actually program them to do push-pull with dead-time(hey SIGLENT: hint, hint...)thought i'd share the setup with you. see below a one-page cheat sheet. if you're too lazy to set it up manually, use the attached XML status instead.(you have to change the file extension from *.txt to *.XML)any suggestions welcome!

author: bicycleguy
author_rank: Frequent Contributor
timestamp: October 04, 2018, 06:20:22 am
content: Would this also work with the SDG2042X ?
JTAG Manager software Introduction. - Page 1
Forum section: electronics / testgear

author: LeoK
author_rank: Newbie
timestamp: October 08, 2018, 08:16:09 am
content: Combined GUI for JTAG (Boundary Scan) testing and CAD viewing.StarTestTM"JTAG Manager"software is a combined GUI for JTAG test sequences running and Board Under Test (BUT) layout CAD viewing in connection with BOM and Schematic PDF of the BUT.This configuration allows to make the test process visual and provides fast searching of the BUT objects (Parts, Pins, Nets) on the BUT image and schematic PDF simultaneously by just clicking on the hyperlinked object name in any window of the GUI.The"JTAG Manager"saves the test reports in text or CSV formats and also saves the test history files in graphic format including all test vectors and failure diagnostic messages. These files can be opened any time for failures analysis.The"JTAG Manager"can be used as CAD viewer only, with or without connection to BOM and schematic PDF in"Test Fault Locator"(TFL) project type.The"JTAG Manager"supports such Boundary Scan test platforms as"Corelis"and"JTAG Technologies"and reads following CAD formats:FABmaster- <NAME>.FAZ, FATF(<NAME>.FAT);GENCAD- CAD file renamed to <NAME>.GENCAD;ODB++- <NAME>.TAR, <NAME>.ZIP;BRD- <NAME>.BRD;Keysight (Agilent,HP) 3070- BOARD, BOARD_XY files packed to ZIP and renamed to <NAME>.3070.The entered CAD file can be converted toFabmasterFATF (<NAME>.FAT) format for further processing by FABmaster (Test Expert) software.The"JTAG Manager"exports the BUT netlist in Telesis or JTN formats for using in Corelis and JTAG Technologies software.The"JTAG Manager"makes easy mapping process for JTAG Technologies test programs.Please read more information here:http://start-test.com/Products/JTAGManager.phpIn order to get link to download the software, please send the message with subject JTAG MANAGER evaluation from corporative e-mail to info@start-test.com. Sorry, but we don't work with individuals.By the first software launch you'll get the Hardware ID code. Please send it to info@start-test.com with subject JM Eval. License request and get 30-days free evaluation license code.
Instek PR-6030 power supply - Page 1
Forum section: electronics / testgear

author: Doogs
author_rank: Contributor
timestamp: October 02, 2018, 10:58:44 am
content: Hi all: I've been trying to locate a service manual for the Instek PR-6030 Power Supply I've just bid on. Tried Google and all the usual manuals sites and searched the odd forum but had no luck. I imagine it's a pretty basic unit going by the block diagram in the user manual but some more details would be nice should I win the unit seeing as it looks like it's seen better days.Hoping someone can help me out.Cheers: Doogs

author: coromonadalix
author_rank: Super Contributor
timestamp: October 02, 2018, 10:01:20 pm
content: Must be similar to the Hyelec HY30xx series, or Mastech ...hy3005hy3010hy3020

author: Doogs
author_rank: Contributor
timestamp: October 04, 2018, 01:03:16 am
content: Moot point now as I lost the bid. It went for $91.00 CAD which is $60 more than I was willing to pay, It was in rough shape and had some brownish stains on the top cover that looked like spillage,
What the...Keithley ! - Page 1
Forum section: electronics / testgear

author: Bud
author_rank: Super Contributor
timestamp: October 03, 2018, 01:57:19 am
content: When i saw it on a local for sale list my first thought was "what on Earth is this...? "Fortunately it did not take too long to find the instruction manual, thanks Tektronix ! I recommend taking a look at it as it has full device specification and interesting information about type of measurements you do not do every day.http://download.tek.com/manual/31415(Model6105).pdf

author: Ghislain
author_rank: Regular Contributor
timestamp: October 03, 2018, 05:30:28 am
content: Nice find, I have personally never come across such unit. Looking at the heavily corroded PL-259/bnc connectors and associated coax cable, it seems like some fellow amateur radio operator found a practical application for this device

author: Brad O
author_rank: Regular Contributor
timestamp: October 03, 2018, 06:48:33 pm
content: Nice! I think that's the second or third resistivity fixture Keithley made. I have the 8008 version on my desk that added a switch for volume measurements instead of requiring separate connectors.The most recent version is the 8009 that made the connector plates spring loaded instead of screw-on.

author: Brad O
author_rank: Regular Contributor
timestamp: October 03, 2018, 06:54:59 pm
content: Here's the wiring schematic for the 8008, I think it's especially interesting how the electrode connections change from surface to volume measurements. Like the ring electrode being guarded for volume measurements to prevent leakage to ground.

author: Bud
author_rank: Super Contributor
timestamp: October 03, 2018, 07:31:12 pm
content: I could buy the poor guy to save its life but can't think of any use in my shack...

author: bson
author_rank: Unknown
timestamp: October 03, 2018, 09:51:14 pm
content: Cool, buy it! I'd let the seller keep the skanky cable though - it looks like something they fished out of a sewer!
Rigol DM3058e:  Using relative mode to set a zero reference while reading dBm? - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: October 03, 2018, 07:50:56 pm
content: I might be missing the obvious but I can't figure out the keystrokes to make this work and the manual is no help either.I'm doing some analog audio work, so I'm reading AC volts in dBm mode (example: 400Hz at +4dBm) and want the Rigol to show 0.00dBm at that level so I can directly read gain or loss in dB as I adjust my circuit.Anyone who has a Fluke 8060 knows how easy it is to do this. But I can't make it work with the Rigol.When I engage relative mode the display jumps to what seems like a nonsense value (-70 something).And the manual is.. well the less said the better, it only made me more confusedWhat the heck am I missing? Thanks.

author: joseph nicholas
author_rank: Frequent Contributor
timestamp: October 03, 2018, 09:04:11 pm
content: The obvious answer is: this function wasn't implemented. But I could be wrong.

author: DaJMasta
author_rank: Super Contributor
timestamp: October 03, 2018, 09:15:57 pm
content: Don't have one and can't test, but is there a dBc or dB mode? dBm is a dB scale referenced to 1mW, so moving the reference point for a relative measurement would just be a dB or sometimes dBc measurement... I don't think it would be meaningful to have a dBm based scale with a relative reference, because then it would just be a dB*that value* scale.So my point relative to your question is: maybe it's under some other dB mode? I think the SCPI commands are supposed to mimic fluke and agilent meter commands, so if it were available over GPIB, I'd expect it exists in there somewhere.
BK PRECISION 1544 OSCILLOSCOPE USER MANUAL  - Page 1
Forum section: electronics / testgear

author: day4201
author_rank: Newbie
timestamp: October 02, 2018, 04:58:28 pm
content: Hi, I just received a BK Precision 1544 oscilloscope and have not been able to find either a user or service manual. While the scope appears to work so far I would still like to have a copy of both manuals. Thanks!

author: tautech
author_rank: Super Contributor
timestamp: October 02, 2018, 07:18:01 pm
content: Quote from: day4201 on October 02, 2018, 04:58:28 pmWelcome to the forum.BK Precision are pretty good for manuals so you should find the correct one here:http://www.bkprecision.com/89-top-menu/index.php?option=com_content&view=article&id=16&Itemid=141Be aware if the 1544 is one of a series of differing BW models then one manual likely covers a few models.Use the manual images of the front panels and introduction descriptions to ensure you have the correct one.

author: day4201
author_rank: Newbie
timestamp: October 03, 2018, 01:26:25 pm
content: Thanks so much for the link. While I was not able to find the manual for the 1544, I was able to find several others that are close enough. I also found a site, ElektroTanya that had a variety of BK Precision manuals but after downloading 3 which I learned was the limit for a "Guest" I had to take a test to register! I failed one of 5 questions and was told to try again another day! A bit strange but there it is. I really hope I can find a service manual for this unit. It was made in Japan by the Dyanscan corporation but searching on that was enough less fruitful than searching on B&K. Thanks again for the link. It will useful in the future.
BM235 Lithium Battery "mod"... - Page 1
Forum section: electronics / testgear

author: sequoia
author_rank: Unknown
timestamp: October 03, 2018, 02:47:14 am
content: BM235 isn't happy camper with 1.8V AAA Lithium cells (https://www.eevblog.com/forum/testgear/the-bm235-does-not-accept-lithium-batteries/).This is my "backup" meter that sometimes doesn't get used for weeks or more, and I've noticed that even slightly discharged Lithium Batteries tend to have voltage creep up slowly (when meter is switched "off") over longer period of time, enough to set the over voltage error when meter is turned on again. To get meter operational again, one can leave meter in diode measurement mode with back light on for few minutes to bring voltage down enough, but this gets annoying quick, if you're working on something and needed quick measurement....When I came across some "ultra low forward voltage drop" diodes: SBR10U40CTThat seemed to have about 0.2V drop at 30mA (these are rated for 10A) which seemed perfect for BM235.... After installing this "mod", I haven't had issues using the meter with Lithium Batteries...

author: bitseeker
author_rank: Super Contributor
timestamp: October 03, 2018, 06:35:26 am
content: That's a big diode. Nice that it fit in there so well. I like the way you used that small square of PCB to slip into the battery circuit.
inside of Pro'sKit MT5211 LCR Meter  - Page 1
Forum section: electronics / testgear

author: hussamaldean
author_rank: Unknown
timestamp: October 01, 2018, 10:49:52 am
content: Hi allI own this multimeter and it is a good multimeter and I am using it. but the range selector has some weird issue and I decided to open it and clean the contacts and throw some pictures in the processhere we go (as dave say don't turn it on takes it apart)the multimeterthe multimeter on diode/ continuity checkI opened the battery department 9V batteries are the worst ever and I already charged this battery 5 times in three months while my UT139C still holding the same unknown brand battery that came with the multimeterwell I blew the mA range fuse and I couldn't find a replacement and say, screw it let me put some wire and forget about protection since I don't use high voltage anyway (max is 30V dc)when I opened the device (all screws are self-taping ones except the battery holderafter removing the holding screws and I saw all of the good stuff and it was mehfor the fixing I used medical alcohol to clean the range contacts and everything is honky doryand thats all for this small teardown and fixSorry but I am newbie in these things

author: alsetalokin4017
author_rank: Super Contributor
timestamp: October 01, 2018, 11:04:16 am
content: You should remove that bodge wire immediately and simply consider the mA range "broken" until you can replace the fuse with one of the proper rating. This has little to do with voltage! You can easily get high currents enough to damage the meter from low voltage sources, even like a flashlight battery. LCR meters are, in my experience, easily damaged by improper connections or range settings. Fuses are there to protect the meter, and to protect you.

author: hussamaldean
author_rank: Unknown
timestamp: October 01, 2018, 11:32:00 am
content: Quote from: alsetalokin4017 on October 01, 2018, 11:04:16 amI don't use it to measure the current at all, I am using my uni-t 139C and soo I will get clamp meter and 171C

author: coromonadalix
author_rank: Super Contributor
timestamp: October 01, 2018, 08:58:52 pm
content: seems nice its a rebadged Victor 88c+It is written on the pcb loll

author: Hydrawerk
author_rank: Super Contributor
timestamp: October 01, 2018, 10:56:42 pm
content: It looks like it wasinspiredby Unitrend UT70A.https://www.eevblog.com/forum/testgear/ut70a-teardown/msg938756/#msg938756

author: hussamaldean
author_rank: Unknown
timestamp: October 02, 2018, 07:02:51 am
content: Quote from: coromonadalix on October 01, 2018, 08:58:52 pmI don't think it is the original pro'skit because I bought it at half price what mentioned in their website
Fluke 87 III 4 1/2 button causes reset - Page 1
Forum section: electronics / testgear

author: fls
author_rank: Contributor
timestamp: March 08, 2016, 04:35:38 pm
content: Hi,I have a Fluke 87 III with a strange problem.When I press the backlight button I hear the short bleep, but no backlight. I actually do not care much about it, but I tell you this because of my 'real' problem.If i hold the 'backlight' button for more then 1 second to enable the 4 1/2 mode, the meter reset.The backlight led is actually fine, I dismantled the meter and removed the flex cable with the led to see if it shorted out or something. But the led is fine.Anyone have any suggestions?

author: mzacharias
author_rank: Frequent Contributor
timestamp: March 08, 2016, 05:20:37 pm
content: The III model does reset to enable the 4 1/2 digit mode. The V model enables the high resolution without a full reset. I double-checked on my III to be sure.

author: fls
author_rank: Contributor
timestamp: March 08, 2016, 06:26:23 pm
content: Oh my! you are right!That's the problem having multiple fluke multimeters from different series...!Ok, then one thing stands, Why is my backlight not lighting up?I tested the led (and flexcable)...

author: retiredcaps
author_rank: Super Contributor
timestamp: March 09, 2016, 01:35:30 am
content: Quote from: fls on March 08, 2016, 06:26:23 pmThe schematics in service manual for the Fluke 80 series I might be close enough to help you troubleshoot the Fluke 80 series III backlight circuit?

author: mos6502
author_rank: Frequent Contributor
timestamp: March 09, 2016, 07:56:06 am
content: Does your meter have a green backlight or a white one?

author: fls
author_rank: Contributor
timestamp: March 09, 2016, 09:56:56 am
content: Thanks for the replies!(My backlight is white.)I think it is Q7. Q5 is not getting any signal when pressing the button and I followed the trace to Q7. Q7 is getting signal from R53, but does not change the output, hence Q5 is doing nothing.One thing that I really do not understand. How on earth can Q7 blow? It is just switching Q5. I really doubt that there is any reasonable amount of energy flowing through. It is a MMBT3904 that can handle 250mW!!!Anyway, I'm going to replace the transistor and see if that fixed it...

author: fls
author_rank: Contributor
timestamp: April 04, 2016, 04:34:58 pm
content: For-people-who-want-to-know: After replacing the Q7 transistor, everything is fine!My best guess that is was physically damaged for some reason. While desoldering the transistor broke in half...

author: retiredcaps
author_rank: Super Contributor
timestamp: April 04, 2016, 05:27:33 pm
content: Quote from: fls on April 04, 2016, 04:34:58 pmThanks for following up and reporting your findings.

author: Resonant
author_rank: Contributor
timestamp: October 05, 2018, 04:53:14 pm
content: I had 2 Fluke 87-III both with non working backlights, after tracing the signal through R53 which was OK. Checking Q7 with another multimeter as if it were 2 diodes in both cases Q7 base-collector were faulty. Changing Q7 has given a complete repair. Looks like it could be a more common problem than you would expect.
GPSDO : Oscilloquartz OSA 5240 - Page 1
Forum section: electronics / testgear

author: psykok
author_rank: Frequent Contributor
timestamp: September 02, 2014, 07:22:38 am
content: Hi,I scored yesterday buy a local seller some interesting GPSDO from Ocilloquartz.This box is usually used to synchronize Mobile installation or broadcasting network.I don't find a lot of documentation about this instrument, only some specification sheet:http://www.oscilloquartz.com/files/1357909783-da_5240.pdfThe interesting point is: you can have different output signal (1pps, 10MHz, 2.048MHz) and the box is using GPS and/or ext aux to adjust the output signal.At this point I'm not sure if only the 2.048MHZ signal or if all signal including the 10MHz are disciplined.The box is powering up, I have all output signals but I'm not sure if the sync with the GPS is currently working because all front led are red.I checked the GPS board and I have the 1PPS signal.So I search any info about this instrument and more specifically the following things:- OSA 5240 Manual- OSA 8240 remote or local management software- Navicom GPCore Sync 15 manualRegards,Alex

author: awallin
author_rank: Frequent Contributor
timestamp: September 02, 2014, 10:04:05 am
content: You should try asking on the time-nuts list - this is probably familiar hardware for many on that list.http://www.leapsecond.com/time-nuts.htm

author: psykok
author_rank: Frequent Contributor
timestamp: September 02, 2014, 10:34:02 am
content: Hi,I asked on the mailing list but I'm now waiting that the moderators approved my message.Alex

author: Arie-Jan
author_rank: Newbie
timestamp: October 01, 2018, 01:24:05 pm
content: hi i know your post is way old but guess what i have the same clock did you manage to get it to work ??mine had same fault turns out bad soldering on the sma connector however after a power failure in the house mine does not run ntp anymore :-(
Rigol DP832 - Page 1
Forum section: electronics / testgear

author: cowasaki
author_rank: Frequent Contributor
timestamp: July 31, 2018, 08:02:17 am
content: Is it still possible to keygen the latest version of the BP832? I'm thinking of buying a new one.... Also I've gone to the web site and it asks for the serial number, upgrade code and private key. The first two are easy enough but is the private key easy to locate or do I need to hack into it?

author: gperoni
author_rank: Contributor
timestamp: July 31, 2018, 08:13:15 am
content: I was doing this to my unit yesterday... The private key is generated from your sn, I believe. I don't believe the firmware was patched. Also inserting those keys is a pain.

author: cowasaki
author_rank: Frequent Contributor
timestamp: July 31, 2018, 09:25:47 am
content: Quote from: gperoni on July 31, 2018, 08:13:15 amSo all you needed to do was get your serial number and type it into the web site with the code of the additional thing you want and it generates the code you type into your PSU? How old/what version software/hardware is your's if you don't mind me asking...

author: cowasaki
author_rank: Frequent Contributor
timestamp: July 31, 2018, 09:48:55 am
content: Just found out I can get the 100 off price for the DP832 from RapidI'm taking a teaching qualification via UCLAN so I will be a QT and can teach at work...... I've been accepted but enrolment isn't for three weeks. I'll probably have to wait until then

author: gperoni
author_rank: Contributor
timestamp: July 31, 2018, 09:58:49 am
content: Mine is a couple of years old, I honestly couldn't even find the firmware version when looking for it yesterday, the menu is that cumbersome. I also plan on replacing the fan on mine because it's so noisy I rarely want to use it.

author: 1anX
author_rank: Regular Contributor
timestamp: July 31, 2018, 10:22:39 am
content: This video explains how!

author: peo007
author_rank: Contributor
timestamp: August 03, 2018, 10:36:49 am
content: Helloi try too upgrade my DP832 with Riglol 1.03d but i only get (Installation fails )i have try all 5 optionsWhat am i doing wrong?Boot ver 1.09Digital ver 00.01.14.00.03

author: peo007
author_rank: Contributor
timestamp: August 06, 2018, 03:58:47 pm
content: Answering myselfI let it be on for more than 24h,Then it worked to feed in the codes

author: Wolfgang
author_rank: Super Contributor
timestamp: September 30, 2018, 12:54:10 pm
content: I started an opinion poll about the RIGOLshttps://www.eevblog.com/forum/testgear/what-is-your-opinion-of-the-quality-of-the-rigol-dp832(a)/msg1856247/#topPlease give a rating of your own experiences with this stuff - good or bad, whatever it may be.ThanksWolfgang
Very nice accessory probe kit from UEI. - Page 1
Forum section: electronics / testgear

author: GeoffreyF
author_rank: Regular Contributor
timestamp: September 29, 2018, 04:04:47 pm
content: https://www.amazon.com/gp/product/B001QC44TY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1UEi Test Instruments ATL301KIT Electrical Test Lead Kit. I paid 28.77 US for the kit on Amazon.This works with the 121MW meter.This kit is a slightly larger scale than would be ideal for some electronic work. Remote grabber clips would be helpful in electronics. The long insulated part of the grabber would be great for reaching within a system, past things you don't wish to risk a short with. If you ever need to connect to a cardiac pacemaker in vivo, these would be perfect. :-) The length might be a little troublesome in some cases. The probes have only a short tip, without a removable sleeve. The "Hilt" or guard is bigger and makes them safer around high voltages. The clips are up to the task of clipping anything, but especially higher gauge or a bus bar.I am pretty sure the leads are Silicone. They are CATIV. With a connector at the meter and at the end probe, attenuation is about double that of the leads that came with the 121GW.Many of the measurements the 121MW is capable of require a third lead. This is a good choice for that and especially where lethal voltages are involved.The styling is similar to that of the UEI leads shipped with my 121MW. The pouch is purpose designed for the kit.
121GW no backlight (button?) - Page 1
Forum section: electronics / testgear

author: int2str
author_rank: Regular Contributor
timestamp: September 29, 2018, 10:17:42 pm
content: Holding the "Mode" button doesn't turn on the backlight at all.Anything I'm missing? Or is my backlight broken somehow?

author: Bratster
author_rank: Frequent Contributor
timestamp: September 29, 2018, 11:47:07 pm
content: Does your backlight flash on for a second when you turn the meter on?I know on firmware version 1.26 it does.Sent from my Fi Moto x4 using Tapatalk

author: int2str
author_rank: Regular Contributor
timestamp: September 30, 2018, 12:16:35 am
content: Nope, just no reaction to holding the button.Pressing it changes mode, so that works.Still on FW 1.22. Will try upgrading to the latest.I know it worked at some point...

author: int2str
author_rank: Regular Contributor
timestamp: September 30, 2018, 12:22:37 am
content: Upgraded to 1.51.Still no reaction to press+hold on mode key...

author: int2str
author_rank: Regular Contributor
timestamp: October 01, 2018, 10:45:43 pm
content: So, not a common problem then I take it....Is there a test mode or something in the firmware?I'm 2 for 2 in broken EEVBLOG products now

author: Bratster
author_rank: Frequent Contributor
timestamp: October 01, 2018, 10:57:59 pm
content: if it doesn't blink when you turn the meter on and does not turn on when you push/hold the button for it then it does appear that the backlight is bad.You should contact Dave and see what they have to say.Shit happens.Sent from my Fi Moto x4 using Tapatalk
Siglent SSA 30xx : How to use gain correction feature?? - Page 1
Forum section: electronics / testgear

author: dazz1
author_rank: Frequent Contributor
timestamp: September 28, 2018, 07:50:59 am
content: HiI want to use the gain correction feature to compensate for the frequency dependent gain of an LNA seen here:https://www.eevblog.com/forum/rf-microwave/spf5189z-lna-for-pre-compliance-use-measured-performance/I want to use the correction feature to subtract the amplifier gain at each data point to normalise the gain curve. The same as the gain is normalised for the TG.I manually created a .COR file with about 4 points in it. The format is simple. It is a CSV file with:frequency (Hz), gain(dB)So I created a CSV file of the amplifier gain curve, about 700 data lines in a CSV file.Calculated the negative gain at each point and saved as a COR file.I then tried loading this back into the SSA. I was expecting a dead flat gain curve at 0dB. The benefit would be that displayed signal amplitude would not vary with frequency. a 10dBm signal at 100MHz would be displayed as a 10dBm signal at 1GHz.It didn't appear to work, but I didn't get an error message.I suspect that I have exceeded the available memory for reading in a COR file but I think it should be able to add correction to each data point. This would be especially useful when taking measurements with an antenna. Adding a correction file would normalize antenna signal readings.Does anyone know the capabilities and limits of the correction feature?? The manual is useless on this subject.Dazz

author: rf-loop
author_rank: Super Contributor
timestamp: September 28, 2018, 10:01:24 am
content: Did you note that after every data pair need LF not CRLF(normal text editor do not show these control characters)LF you can generate using ALT+010So it is likefreq,levelfreq,levelfreq,level.......Most text editor hide control characters as default and original SA made .COR may look like thisfreq,levelfreq,levelfreq,levelbut it have this and this is OK [hidden byte]freq,levelfreq,levelfreq,leveland this original some text editor may show like freq,levelfreq,levelfreq,level(example windows notepad)but if have used text editor write it it may be like this and it do not workfreq,levelfreq,levelfreq,levelBut it looks like this (and due to wrong data points separation it do not work)freq,levelfreq,levelfreq,levelJust write and test bit over 1200 data points but it looks like only first 751 datapairs works.(nice coincidence, trace data length in SSA3000X is 751.)

author: dazz1
author_rank: Frequent Contributor
timestamp: September 28, 2018, 11:51:45 am
content: HiThat is the nugget of information missing.I will use Notepad++ to put in the LF.Dazz

author: dazz1
author_rank: Frequent Contributor
timestamp: September 29, 2018, 02:45:40 am
content: HiIt worked perfectly.Dazz
Extech 470 calibration adjustment procedure? - Page 1
Forum section: electronics / testgear

author: RK_aus_S
author_rank: Contributor
timestamp: September 24, 2018, 04:23:17 pm
content: HiDoes anybody have any information how to calibrate an Extech 470 multimeter? Especially the 400 mA current measurement range?Or does anybode have a service manual with calibration procedure?The device really hasmanypotentionmeters! I count 16; VR1 to VR16.I've had to replace the 500 mA fuse as well as resistor R13 (99 Ohm, 0,5% tolerance) because I made a short circuit during AC measurement (in the 400 mA range). If I replace the resistor, I think I have to re-calibrate this range.I would be grateful for every help.RegardsRoman

author: threephase
author_rank: Regular Contributor
timestamp: September 24, 2018, 06:56:11 pm
content: If you send an email to support@extech.com with the model number of the meter and request a calibration procedure they should provide one for you.Unless someone on here has already done that and can provide it.Extech FAQ -http://www.extech.com/display/?id=13759.

author: RK_aus_S
author_rank: Contributor
timestamp: September 26, 2018, 06:05:29 am
content: Thanks, threephaseI wrote to support@extech.com as well as to service@extech.com. Maybe they are very busy, but I didn't hear anything from them.Maybe I have to be much more patient.If anybody anyway has this calibration procedure; I wouldn't have to wait...

author: threephase
author_rank: Regular Contributor
timestamp: September 26, 2018, 09:36:34 pm
content: They took three days to respond to me when I had an issue with an MG302 and would respond every couple of days as the issue progressed. So not the speediest.Kind regards

author: RK_aus_S
author_rank: Contributor
timestamp: September 29, 2018, 10:25:01 am
content: Got it.You were right, you have to be patient.

author: threephase
author_rank: Regular Contributor
timestamp: September 29, 2018, 12:45:43 pm
content: Cool, glad you got sorted
Using an oscilloscope to view current waveform through a stepper winding - Page 1
Forum section: electronics / testgear

author: presse55
author_rank: Newbie
timestamp: September 26, 2018, 05:33:27 pm
content: Hello group,I wish to analyze the current waveform through the my stepper's windings.Reason: uneven steps -. As you can see, the application runs fine, the stepper steps, forwards, reverse, accelerates, etc; just the steps are uneven at low speed.I will be receiving a Rigol DS1102E shortly. I have no experience with an oscilloscope, and am looking for guidance on viewing the current waveform on this stepper.The stepper is driven by a Pololu A4988 motor driver with voltage regulators, configured at 16 uSteps/full step;The stepper’s characteristics:Stepper rated voltage: 12VStepper rated current: 0.33ASupply voltage: 18VDC, Li Ion battery, floating, ie not ground referencedL=48mHR=32.6ohmsf= 10Hz - 100Hz (ie 10 to 100 full cycles of 16uSteps per full step per second)My questions:I do not have a current probe, so plan to use a shunt resistor in series. The only technique I have found on the internet involves the use theA-B differential method illustrated hereto measure voltage difference between two probes.Is there another more appropriate or direct way to plot the current waveform using this scope?For shunt resistor value, my calcs so far if I am correct point to a 1 ohm resistance.Does this look right?Feel free to redirect me to any existing post dealing with this topic.Thanks in advance for your responses!RonMontrealPS: I'm a bit of a noob with electronics, but I've been through the phasor representation for this setup.

author: MrW0lf
author_rank: Frequent Contributor
timestamp: September 26, 2018, 07:11:59 pm
content: This best you can do with 2 ch scope, shunt and floating DUT to see current and voltage. Main thing: Ground clipsmust be connected togetherto same place. 1ohm is fairly large for shunt. I use special 0.1ohm non-inductive max. But in this case might not matter much since this is pretty civilized motor not near-short like brushless outrunners.

author: presse55
author_rank: Newbie
timestamp: September 26, 2018, 07:35:10 pm
content: Cool, thanks for the reply MrW0lf!I like your suggestion cause that way I'll get to seebothvoltage and current!Thanx!

author: threephase
author_rank: Regular Contributor
timestamp: September 27, 2018, 07:08:14 am
content: Good advice MrW0lf

author: korlatos
author_rank: Regular Contributor
timestamp: September 27, 2018, 03:57:18 pm
content: You can easily build a low-cost current probe that covers DC-200kHz range. Please look at the attached application note for details.
Suggestion regarding Micsig DP10013 - Page 1
Forum section: electronics / testgear

author: SHARANYA
author_rank: Contributor
timestamp: August 27, 2018, 07:25:45 pm
content: I am thinking about buying a Differential probe.But my budget is tight.Will Micsig DP10013 be a good choicce?I don't need to operate on very high frequencies.This is basically to study & troubleshoot regarding 220v AC mains,Please give your valuable opinion.

author: Micsig_support
author_rank: Regular Contributor
timestamp: September 28, 2018, 01:10:02 am
content: Quote from: SHARANYA on August 27, 2018, 07:25:45 pmsee this video, it will help you i guess.

author: Mr. Scram
author_rank: Super Contributor
timestamp: September 28, 2018, 01:13:40 am
content: Quote from: Micsig_support on September 28, 2018, 01:10:02 amPlease note that there's "ftp://" at the beginning of your link, which means the link won't work.

author: Micsig_support
author_rank: Regular Contributor
timestamp: September 29, 2018, 08:54:12 am
content: :palm:thanks so much. now it is working
Old LeCroy price listings available? - Page 1
Forum section: electronics / testgear

author: Kirkhaan
author_rank: Frequent Contributor
timestamp: September 23, 2018, 09:14:31 am
content: I'm owning some "old" LeCroy equipment from 2001 - 2008. All pre-owned.Now I am curious to know how much these costs back then.Does anyone happen to know if there are price lists available from that period?BTW: I don't think they even publish prices on their website today, do they? I know Tektronix does work with online List Prices (example)

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: September 25, 2018, 02:42:02 am
content: From a 1998 catalog (but I cannot find prices in the 2001 catalog onwards), a top of the line top of the series DDA-120 (1 GHz and 8/4/2 GS and 16/8/4M for 4/2/1 channels respectively) is $41,990 and an entry level 4-chanel unit (9304C - 200 MHz/100 MS/50K per channel) is $6,290 along with an entry-level 2-channel unit (9310C - 400 MHz/100 MS/50K per channel) is $4,990.

author: xemax
author_rank: Contributor
timestamp: September 27, 2018, 08:44:30 am
content: On archive.org:https://web.archive.org/web/20020618222146/http://www.tequipment.net:80/LecroyPriceList.htmlhttps://web.archive.org/web/20070911205410/http://www.tequipment.net:80/LeCroyPriceList.html