hybridfree/eevblog-posts huggingface dataset:
Electronic load question - Page 1
Forum section: electronics / testgear

author: jayk
author_rank: Regular Contributor
timestamp: September 26, 2018, 07:37:42 pm
content: I'm thinking about getting a benchtop electronic load like an itech 8511A+ or Rigol DL3000. Most electronic loads are specified with a minimum voltage at two different ranges: something like 0.14V @ 3A or 1.4A @ 30A. If I'm on the 30A range, will I be able to get to a lower voltage if I'm below the rated current (i.e. 0.7V @ 15A)? Has anyone tried this?

author: KrudyZ
author_rank: Frequent Contributor
timestamp: September 26, 2018, 08:07:43 pm
content: Very likely as most (all?) modern electronic loads use MOSFETs as pass transistors. The forward voltage drop will therefore be limited by Rdson plus the current balancing series resistors and sense resistors.This should be documented in the manual for the load. THere usually is a VI graph that shows the range of load voltages and currents that the instrument can handle.

author: JohnPi
author_rank: Regular Contributor
timestamp: September 27, 2018, 04:11:58 am
content: You can go to 0 (and below) by just putting an external supply (with the current handling capability) in series with it, and setting that supply's output to a low value (e.g. 1 V).
Agilent Free DMM Connectivity Utility software gone from the WWW - Page 1
Forum section: electronics / testgear

author: cape zoloh
author_rank: Contributor
timestamp: November 22, 2017, 04:36:51 pm
content: This software installation file is not available anymore from the www, it seems. If someone have the file, guard it with your life + send me an PMThanks.edit: To clarify, I'm looking for the OLD Aligent software.

author: enut11
author_rank: Super Contributor
timestamp: September 28, 2018, 04:35:07 am
content: Ditto. I too am hoping that someone has a copy of the free Agilent dmm connectivity software. Pls PM if so.enut11

author: HighVoltage
author_rank: Super Contributor
timestamp: September 28, 2018, 09:02:53 am
content: It is 108MB in size, you have a place to upload?

author: Candid
author_rank: Regular Contributor
timestamp: September 28, 2018, 09:27:59 am
content: wetransfer.combut this is only kept for some days but for free.

author: ArcticGeek
author_rank: Regular Contributor
timestamp: September 28, 2018, 01:43:29 pm
content: How about uploading it to the K0BB website? Just a thought.
HP 8568B Front panel unresponsive. - Page 1
Forum section: electronics / testgear

author: Simon Spiers
author_rank: Regular Contributor
timestamp: September 25, 2018, 12:46:46 pm
content: Some of you may know I purchased a non working RF section model 8568b a few months ago and thought i had managed to successfully repair it. I had been using for a few days when the same fault came back.On power up the unit shows the check instrument light and the keyboard is unresponsive to commands despite some of the yellow led's being on to show input selection ect. I know the lower RF section will respond to commands without the IF section connected and also that there is not a stuck key. One of the tests to confirm this is to power the instrument op and hold any key except lcl and press instrument preset. ~This should flag the check instrument 1 light to confirm the keyboard is faulty. This appears to work correctly so I do not suspect the keyboard or its controller on the A12 board.I have also swapped out both the A12 and A15 board (RF and keyboard interface and processor board) without any luck.My question is, am i looking for a stuck data line? If ?I remove the offending board, will this release the keyboard ?The Processor board shows no error when connected to the IF section but does when standing alone. This is what it did when it was briefly working.Any clues would be most appreciated.
feeding uCurrent output to an ADC - Page 1
Forum section: electronics / testgear

author: riforifo
author_rank: Newbie
timestamp: September 24, 2018, 01:49:42 pm
content: Hello,I use a Ref200 to generate a 100uA current source and read 99.5 mV with a multimeter.For a quick test, I also connected the uCurrent output voltage directly with an arduino ADC.I get varying results between 60mV and 110 mV.I'll add an moving average algorithm but aside from software,What are your recommendations for connecting uCurrent output to an ADCI can try adding an amplifier in voltage follower mode. Your recommandations are highly appreciated.thanks

author: ogden
author_rank: Super Contributor
timestamp: September 24, 2018, 01:56:21 pm
content: Quote from: riforifo on September 24, 2018, 01:49:42 pmNumber one recommandation: match sensor output voltage range to ADC input voltage range. Only then you will have highest resolution of sensor data measurements.

author: bson
author_rank: Unknown
timestamp: September 24, 2018, 08:14:42 pm
content: Look for sources of noise. The DMM will have an anti-image filter, while a naked ADC pin doesn't.
HP859x and external CRT - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: September 20, 2018, 08:13:56 pm
content: I have a HP8591EM which has a composite video output on back panel. I've tried this with all sorts of video monitors (all LED). I know I can change modes on S/A and I did.I cannot make the entire display show up on external CRT. the best I could do was have most it show up but very top and very bottom was cut off. Has anyone successfully done this? Can I get some assistance? If there is a make and model that works, I don't mind buying.I know there was a discussion on here while back but I cannot find the thread. I have an issue with large amount of information presented all at once (such as search) so it doesn't help me much.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 20, 2018, 10:49:50 pm
content: Does your external monitor follow theses specs ? Can it switch between Pal and Ntsc ?50 Ω BNC,NTSC, 15.75 kHz, 60 Hz or PAL, 15.625 kHz, 50 HzMONITOR OUTPUTDrives an external monitor with a signal that has a 15.7 KHz horizontal synchronizing rate. It can also be switched to provide an NTSC format outputwhich is compatible with VHS video recorders or a PAL format which is compatible with PALSECAM video recorders

author: RFDUK
author_rank: Regular Contributor
timestamp: September 21, 2018, 06:31:38 am
content: I have the exact same SA and have been through the same search for a compatible monitor without success.Has anyone used a monitor that is proven to be compatible? Thanks.

author: tkamiya
author_rank: Super Contributor
timestamp: September 24, 2018, 12:59:41 pm
content: Thanks. I have no idea what kind of spec my displays have on composite port. It's not listed anywhere other than it's NTSC. One commonality is they are all digital LCD displays. I think, nowadays, composite is an after thought. I'm looking for a studio quality CRT type display from the same era. Maybe that'll work better - and certainly has far more adjustment than consumer types.I'll come back and report with exact model number if I'm successful.

author: tkamiya
author_rank: Super Contributor
timestamp: September 24, 2018, 10:55:56 pm
content: Odd.... Horizontal scan rate on NTSC is 15.75KHz by definition of NTSC. That means any monitor can be usable.Just to be clear... the image is stable. It's just that image does not fit the screen area. It's always too big in one way or another. If there is such thing as offset and gain for H and V, it should solve the problem.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 24, 2018, 11:02:05 pm
content: Do you have vertical size and horizontal size adjustments ??
Rigol DSA 800 Series Spectrum Analyzer Product Refresh? - Page 1
Forum section: electronics / testgear

author: paretpp
author_rank: Newbie
timestamp: September 23, 2018, 02:23:47 pm
content: I hope I'm not covering old ground here. I am an electronic hobbyist and Amateur Radio operator. I am in the market for a low cost (<$2,000) Spectrum Analyzer. Of course, I've arrived at making the decision between the Rigol DSA815-TG and the Siglent SSA3021X. I love the build quality of the Rigol but love the bigger screen / screen resolution and better perfomance specs of the Siglent. (There's something about that flimsy click-wheel on the Siglent that doesn't sit well with me.) The Rigol was released 5 years ago and the Siglent was released 2 years ago. I was wondering if anyone knows if Rigel has a product refresh in the works? What is the average time between Rigol Signal Analyzer product refresh? If Rigol has an updated unit coming out soon that can better compete against the Siglent specs, I'll wait a bit for it to come out.

author: tautech
author_rank: Super Contributor
timestamp: September 23, 2018, 07:15:17 pm
content: Quote from: paretpp on September 23, 2018, 02:23:47 pmThey don't give any issues and there's a lot of SSA's in the marketplace now.If 1.5 GHz is enough BW for you the new SVA1015X SA/VNA combo might be of more use for you.I certainly found it more useful than just a spectrum analyser when I did this project:https://www.eevblog.com/forum/rf-microwave/antenna-project-log/

author: cyberfuzzy
author_rank: Contributor
timestamp: September 24, 2018, 10:50:37 am
content: Hi paretppQuote from: paretpp on September 23, 2018, 02:23:47 pmI think Rigol updated the hardware of the DSA815 some time ago. I have a DSA815 and the noise floor (see attached png) seems to be lower than in Dave's video here:EEVblog #891 - Siglent SSA3021X vs Rigol DSA815 Spectrum Analyser

author: DaJMasta
author_rank: Super Contributor
timestamp: September 24, 2018, 03:56:29 pm
content: Not that I know, but I wouldn't expect a refresh all that soon. Test equipment refresh cycles are often long, and with the new Siglent VNA and the new Rigol flagship scope, I sort of wouldn't expect a significant update to their spectrum analyzer lines for marketing related reasons. I also think both products are selling pretty well, because they're pretty capable units that are really some of the only choices for new equipment in this price bracket.

author: TurboTom
author_rank: Super Contributor
timestamp: September 24, 2018, 05:44:43 pm
content: It's actually correct that Rigol spun a substantial modification of the RF section of the DSA815 in April 2014. My DSA815 PCB carries a date code of 07/15 and is labled DSA815_V02.04. Please compare the following two photos, the first must be one of Dave's from his teardown, the second is one that I took of my unit (sorry for the blurry left area, but I guess it's good enough to see the higher complexity in the input and first mixer circuitry). This machine has an approx. 10dB better noise floor than Dave demonstrated on the machine he reviewed.Hope this helps to enlighten the situation.
Hantek 1008 c - Page 1
Forum section: electronics / testgear

author: Irocz89
author_rank: Newbie
timestamp: September 23, 2018, 08:56:37 pm
content: Does anyone have one of these?I'm in need of a copy of the firmware as the Mcu died! I can replace and recode but useless I believe without a basic firmware in placeThank for you helpSent from my iPhone using Tapatalk
Wavetek 9100 calibrator teardown photos - Page 1
Forum section: electronics / testgear

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:43:37 pm
content: I've recently acquired a Wavetek 9100 calibrator. Here are some photos I took while cleaning it out. This top board is Option 600. The 600 MHz oscilloscope calibration module.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:46:19 pm
content: One more picture of option 600 board and the front panel board.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:47:43 pm
content: Close up shots of the front panel board.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:48:42 pm
content: This is the main power board. I believe that it handles all power supplies as well as the current output functions. up to 20 amps AC and DC.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:50:34 pm
content: More of the power board.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:52:39 pm
content: More of the power board

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:53:13 pm
content: The first picture is a close shot of the traces for the current output portion. Lots of isolation slots, guard traces, star grounding and many of the large traces have an extra layer of copper applied and then solder mask on top.The second photo is of the bottom main board. I believe that this board handles everything other than oscilloscope functions and current.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:54:37 pm
content: More of the bottom main board.

author: kyleaudio
author_rank: Contributor
timestamp: September 23, 2018, 07:55:18 pm
content: Option 100 high stability crystal reference and the LM399 voltage reference.
GWinstek Marcom Tools - What are they? - Page 1
Forum section: electronics / testgear

author: rfdes
author_rank: Regular Contributor
timestamp: September 22, 2018, 12:30:16 pm
content: I noticed a new MSO series firmware upgrade (1.36) on their site this morning.I also notice that they have for download something they named 'Marcom' tools. Does anyone know what these are? You need to be a VIP member to download them, whatever VIP member means. Just wondering if I'm missing something interesting.ThanksJim

author: rfdes
author_rank: Regular Contributor
timestamp: September 23, 2018, 02:05:02 pm
content: No one has any idea?

author: xrunner
author_rank: Super Contributor
timestamp: September 23, 2018, 02:09:28 pm
content: Quote from: rfdes on September 23, 2018, 02:05:02 pmIs that area for resellers? Here's what I found about Marcom Tools -QuoteMaybe it's for marketing but I really don't know.

author: rfdes
author_rank: Regular Contributor
timestamp: September 23, 2018, 05:13:17 pm
content: That certainly sounds plausible. I'll bet you're right... Thanks

author: wraper
author_rank: Unknown
timestamp: September 23, 2018, 05:17:26 pm
content: I think VIP member is just registered user.

author: ChuckDarwin
author_rank: Regular Contributor
timestamp: September 23, 2018, 06:43:11 pm
content: Yes, marketing communications: product intro and info slides.And correct, VIP is just a registered user.
LeCroy hacking - Page 1
Forum section: electronics / testgear

author: rhb
author_rank: Super Contributor
timestamp: September 21, 2018, 12:38:25 am
content: Has anyone looked at using a DDA-120/125/LC584/684 main board for ADC to an FPGA dev board? Given the way the PPC board connects to the system, making a replacement with a Zynq seems quite reasonable if the connector interface protocols are fully documented correctly.

author: rhb
author_rank: Super Contributor
timestamp: September 22, 2018, 10:50:17 pm
content: It took a bit for me to understand what I was looking at, but it's 4 AFEs with a set of anti-alias filters leading to the ADCs. LeCroy uses the same filter for 2 GS/S as for 4 GS/S. So in 4 channel mode all your data are aliased. Caveat emptor.However, the physical topology is such that it is very simple to run SMA cables to and from SP6T relays placed where the CRT used to be. A $90 or less VGA monitor takes care of the display. The VGA/parallel port card has an internal VGA output. So with a RPi 10" monitor and a short VGA cable replacing the CRT is about as easy as it gets.This would allow collecting good data for:four 750 MHz channelstwo 1.5 GHz channelone 3 GHz channeltrue ETS/RIS samplingThe Fc values reflect a -3dB point consistent with minimal (<1 %) overshoot.Does anyone else have a DDA-120/125? At realistic eBay prices, they are very cheap for what you can get with some modifications.
Agilent DSO6104L - Boot data error occurred - Page 1
Forum section: electronics / testgear

author: egonotto
author_rank: Super Contributor
timestamp: September 22, 2018, 03:09:27 pm
content: Hello,I have a used DSO6104L since four weeks. Sometimes after turn on comes the message:"System conserns detected:- Boot data error occurred- The default setup was loaded"I have not found an explanation of this error.What does this mean?How can I repair the problem?Best regardsegonotto

author: Carrington
author_rank: Super Contributor
timestamp: September 22, 2018, 04:53:01 pm
content: Reload FW in this order: sys, lib, gsp, lpk.Then, run a self test, and adicionally (if you can) do a self cal.
Flir multimeters - who is the OEM? - Page 1
Forum section: electronics / testgear

author: Synthtech
author_rank: Regular Contributor
timestamp: September 22, 2018, 09:31:48 am
content: I have been looking at the range of Flir multimeters (DM 62, DM66, DM92) as I want a cheaper toss around meter for a spare for the workshop and I already have plenty of high end meters, I assume that the Flir meters are probably re-badgers from a Chinese OEM, does anyone know tho makes their multimeters?

author: 001
author_rank: Super Contributor
timestamp: September 22, 2018, 09:41:50 am
content: looks like facelifted/rehoused CEM models

author: threephase
author_rank: Regular Contributor
timestamp: September 22, 2018, 10:44:01 am
content: The Flir IM75 that I have is all branded Flir inside on the PCBs, it is also a high quality build and not the norm you get for a rebadged meter. It doesn't look like CEM do 'their version' of the IM75 so it may be bespoke and as 001 says the multimeters may be clones.As Extech are owned by Flir, the Extech MG302 meter I have is definitely a CEM rebadge and is even marked inside as a DT9985 which is the CEM manufactured meter. It also looks like DiLog have their version of this as the DL9307, that is also badged inside as the DT9985 model.My Flir IM75 blog on eevblog if you are interestedhttps://www.eevblog.com/forum/testgear/flir-im75-teardown/msg1793243/#msg1793243or element14 if you want some more in-depth detailshttps://www.element14.com/community/groups/test-and-measurement/blog/2018/08/27/flir-im75-insulation-tester-dmmKind regards

author: Synthtech
author_rank: Regular Contributor
timestamp: September 22, 2018, 11:40:03 am
content: Great info threephase, thanks!

author: threephase
author_rank: Regular Contributor
timestamp: September 22, 2018, 12:28:36 pm
content: You're welcome Synthtech
DSOX 2000 firmware questions - Page 1
Forum section: electronics / testgear

author: GregerG
author_rank: Contributor
timestamp: September 22, 2018, 11:33:21 am
content: I'm having a hard time finding the answers I seek in the current huge thread(s) (chronic migrane sucks - words are 'melting together' and large threads gets really confusing)... I just have a couple of questions:Which is the latest firmware I can USB boot?Currently running 2.35 and I don't want a permanent update, don't have the LAN module and I don't mind the 'Unfinalized software' notice.Is it possible to use the DSOX2PLUS upgrade on the latest USB bootable firmware?Cheers//Greg.
Cheap all-rounder DMM in 2018 - Brymen 257s or something newer? - Page 1
Forum section: electronics / testgear

author: Warhawk
author_rank: Frequent Contributor
timestamp: September 25, 2018, 09:46:06 am
content: I am just about to buy a couple of DMMs for our corporate lab. It should be just a universal (basic) everyday DMM. I have good experience with Brymen 257s. Is it still a good choice in 2018?PS: We already have agilents and flukes there but we seldom use higher specs. Also, I am looking for a budget option this time.

author: voltlog
author_rank: Regular Contributor
timestamp: September 25, 2018, 10:21:42 am
content: The Brymen BM257s is 100EUR. I don't think you can get cheaper than that and still maintain the quality & safety/certification aspects which are important considering you are getting these for the corporate lab.

author: Warhawk
author_rank: Frequent Contributor
timestamp: September 25, 2018, 12:53:38 pm
content: Thank you, this is what I expected. I just click 4x BM257s.
$50 for multimeter+LCRmeter+soldering station - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: September 22, 2018, 07:41:45 am
content: Hi!I`m looking for small road kit for $50The dmm will be ZT302https://www.ebay.com/itm/BSIDE-ZT301-ZT302-Portable-Handheld-Digital-Multimeter-Electrical-Test-Machine/253475385751?hash=item3b044f7197:m:m--NQrTqpw6np6fmSvO-z_QThe LCR meter will be wellknown Atmega transistortesterhttps://www.ebay.com/itm/BSIDE-ESR02-Pro-Handheld-Digital-LED-Display-Transistor-Tester-Inductance-Meter/123380262828?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20131017132637%26meid%3Dc6b0eaa3725945b6bffe2adb52518054%26pid%3D100033%26rk%3D6%26rkt%3D8%26sd%3D253475385751%26itm%3D123380262828&_trksid=p2045573.c100033.m2042The soldering "station" ishttps://www.ebay.com/itm/80W-Griff-Elektrisch-Lotkolben-Lotspitze-Welding-Loten-Schweisen-Tool/292655955664?hash=item4423a77ed0:m:msEznDM4e_GdcDG5kP6NS-wAny opinions? Any variants?What about options?Can I get all kit in one color?
FLUKE automatic multimeter  7-300 Any ideas? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: September 21, 2018, 09:24:27 am
content: I`m confusedIs it Fluke?Is it good?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 21, 2018, 10:40:58 am
content: I would say yes, in my town at a Fluke calibration center, they try to sell what they have left.For the price, i find them poorly spec'ed, not worth to buyunless they are given to you lollThey are obsoletes by the way.Product Type Voltage DetectorsAC voltage accuracy ±2.9% of reading + 3 digitsAC Max (Voltage) 400vDC voltage accuracy ±1.5% of reading + 1 digitDC voltage range 40.00 V, 400.0 V, 300 VResolution: 0.01 V to 40.00 V, 0.1 V to 400.0 V, 1 V above 400.0 VResistance range 0 to 400 ohmAuto Selection of volts ac, volts dc, resistance, and continuityCAT III 300V (7-300), CAT III 600V (7-600)Power 9 V battery (included)Display 4000-count LCD

author: 001
author_rank: Super Contributor
timestamp: September 21, 2018, 05:44:48 pm
content: ± 2,9% looks goodlike my analog meter
Anyone know about this? Lab Volt 206 - Page 1
Forum section: electronics / testgear

author: OrringtonManTEK
author_rank: Newbie
timestamp: September 20, 2018, 04:36:26 am
content: all I could gather is that it is made by Buck Engineering out of N.J. they sent me sales flier from 1959 I believe, but that is all they had in their archive. It is one hell of a machine but I would love service documentation/Manual if at possible. Thank you in advance for any help you may be

author: 001
author_rank: Super Contributor
timestamp: September 20, 2018, 05:14:57 am
content: looks interestingany more info?

author: coromonadalix
author_rank: Super Contributor
timestamp: September 20, 2018, 09:29:59 pm
content: some insides photoshttps://antiqueradios.com/forums/viewtopic.php?f=8&t=332923

author: cdev
author_rank: Super Contributor
timestamp: September 21, 2018, 01:56:39 am
content: The 0-20v supply is capable of current limiting. Thats a plus in its favor I suppose.
Experiences with multimeter probe screw on tips - Page 1
Forum section: electronics / testgear

author: GeoffreyF
author_rank: Regular Contributor
timestamp: September 20, 2018, 03:36:59 pm
content: Probes provided with multi-meters such as Brymen, 121GW, Fluke, UEI have a threaded part to the tip so that someone can connect a banana plug add on, an alligator clip etc. to the end of the probe. What experiences have people had with these being interchangeable or not? Is the screw thread the same? The clearances to screw something on the same?

author: threephase
author_rank: Regular Contributor
timestamp: September 20, 2018, 04:27:08 pm
content: I have a Flir IM75 with threaded probes on the test leads and Fluke threaded accessories will not fit those. The thread on the Flir leads is a larger diameter, they are not branded though so suspect that they are manufactured by a third party and purchased by Flir.Kind regards

author: drussell
author_rank: Super Contributor
timestamp: September 20, 2018, 04:36:57 pm
content: Most of them are usually 8-32 UNC thread.Some are different (probably some similar metric size) and will not interchange.

author: Stray Electron
author_rank: Super Contributor
timestamp: September 20, 2018, 05:31:02 pm
content: I've used them but I'm not a fan of them. They all use a very loose fit thread and they always have intermittent connections and in fact, the threads are so loose that the tips fall off and are easily lost. Frankly, the press on tips work better than the screw on ones. Someone, I don't remember who, also makes a set of meter probes that have a collar than you have to pull back to release or to add a tip (like a quick disconnect on an air line), they also work well and won't fall off.

author: nanofrog
author_rank: Super Contributor
timestamp: September 20, 2018, 06:47:10 pm
content: Quote from: Stray Electron on September 20, 2018, 05:31:02 pmSame here.My main reason for this is that the connector + probe weight make them more prone to slip off of the test point/component lead. Modular connectors attached to banana leads are less prone to this IME, and there are more connector ends available than the threaded offerings.
Sencore Super Crickets and the 39G85 'Touch Test Probe' - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: September 20, 2018, 02:02:44 pm
content: Hi all-I'm looking to buy an in circuit transistor tester and, as far as I know, the TF46 Super Cricket was the best one Sencore ever made (am I right about that?). But I want to get the spring loaded probe adapter 39G85 as well.There's a few TF46's on eBay but not many include the probe. So I probably have to buy these two pieces separately.Question: Does anyone else make something similar to the 39G85, or is finding the actual Sencore piece my only option? Many thanks.Also, if anyone here has one or both of these for sale, feel free to contact me. Thank you.
DE-5000 LCR Meter Measurement Accuracy of Small Inductors - Page 1
Forum section: electronics / testgear

author: cvanc
author_rank: Frequent Contributor
timestamp: September 18, 2018, 02:47:17 pm
content: Hi all-So in the thread below we discussed how small a capacitor the DE-5000 can reliably measure and I (at least) was amazed that an inexpensive tool such as this can easily sort out a 1pF cap. Nice!https://www.eevblog.com/forum/testgear/de-5000-lcr-meter-measurement-accuracy-of-small-capacitors/msg1811819/#msg1811819So... what about inductors? Who here has used this with very small values and can speak to 'edge of the envelope' performance? How low do we feel this can be trusted?I've only tested mH stuff, so I don't know. Can any of you microhenry types share your experience? Thanks.

author: indman
author_rank: Super Contributor
timestamp: September 18, 2018, 03:23:23 pm
content: Quote from: cvanc on September 18, 2018, 02:47:17 pmYes,DE-5000 it is capable to measure small inductance very precisely, even nanoH, but there are important features at measurement.Indications taking into account drift 0 are stable, but very strongly depend on quality, reliability and force of a clip of contacts of Calvin and also on purity of contacts of the most checked detail.Warning!Before calibration 0, for the test of small sizes of inductance it is very desirable to exclude influence of own inductance of test wires (from change of their situation at measurement). For this purpose they on all length are recorded by an insulating tape, it is possible to apply temporarily plastic couplers!After calibration 0 provision of wires and clips at measurement shouldn't change!In the photo measurement of small inductance in the form of a ring and also drawings from the program of calculation of inductance Coil32 is shown. Results of measurements on DE-5000 completely coincide with calculated by the program.
BM235, question about Auto V. - Page 1
Forum section: electronics / testgear

author: Hextejas
author_rank: Frequent Contributor
timestamp: September 18, 2018, 12:16:44 pm
content: On the meter, there is a selection that says: Auto V , Lo(or q)Z.The reason for my query is that I had started another thread and posted a voltage reading taken with the meter in the Auto V position. A responder posted that I should never use that setting. I never pursued it as it was way off topic.So here I am wondering if there was any substance to the warning.

author: HKJ
author_rank: Super Contributor
timestamp: September 18, 2018, 12:24:58 pm
content: A Low-Z range has lower input impedance (May be down to a few kOhm at low voltage), worse precision and may not work at low voltages.As long as you can accept that, there is no problem using it.

author: Specmaster
author_rank: Super Contributor
timestamp: September 18, 2018, 01:03:56 pm
content: Quote from: HKJ on September 18, 2018, 12:24:58 pmUnless your working on vintage gear, always use Auto B as most voltage readings these days are taken with digital meters having high input impedance.
EEVBlog DMM thermocouple safe temperature range? - Page 1
Forum section: electronics / testgear

author: cbc02009
author_rank: Regular Contributor
timestamp: September 18, 2018, 11:38:20 am
content: Hello,I have the EEVBlog BM235 and the k-type thermocouple that it came with. The manual specifically mentions that it doesn't include the range and accuracy for the thermocouple.I am going to be doing some reflowing, and I would like to use the DMM to measure the temperature. Will the thermocouple be safe to use at those temperatures for those periods of time, or should I get a new one? I don't really know what the blue coating on the wire is made of, so I don't really know if it will melt or not.

author: HKJ
author_rank: Super Contributor
timestamp: September 18, 2018, 12:26:26 pm
content: The problem is the isolation on the cable, the times I have seen a rating for it it (On cheap thermocouplers) is usual in the 300°C ~ 400°C range.
Who asked me to test for sprius signal 10.7Mhz below on HP8568B? - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: September 17, 2018, 11:40:02 pm
content: Some one asked me to try lining up multiple HP8568B and see if a sprius signal shows 10.7Mhz below fundamental. I cannot find that thread. Whomever asked me, I just tried it with 4 sets.Only ONE shows this and it is 52db lower than fundamental. None other machines shows this signal.If you'd excuse me, I'll be sitting in front of FOUR HP8568B and having a cold beer.

author: tkamiya
author_rank: Super Contributor
timestamp: September 18, 2018, 12:33:57 am
content: There was another one that showed the signal but was 10db lower than the first.So I do have a few that exhibit the issue.

author: NexusKoolaid
author_rank: Contributor
timestamp: September 18, 2018, 01:03:58 am
content: Quote from: tkamiya on September 17, 2018, 11:40:02 pmIs this it?https://www.eevblog.com/forum/repair/hp85662a-graticule-out-of-focus-but-everything-else-is-fine/msg1819697/#msg1819697
HP 8015A Pulse Generator Intermittent Power Up - Page 1
Forum section: electronics / testgear

author: rastro
author_rank: Frequent Contributor
timestamp: September 17, 2018, 04:19:03 pm
content: I recently acquired an HP 8015A Pulse Generator. It seemed to work great when I first turned it on. However I started noticing intermittent power up issues. After about 4 hours of troubleshooting I noticed in the manual a comment of an 8-second safety delay (capacitor/resistor) after instrument shut down. This is mentioned 'briefly' twice in the manual and is easy to miss.If you turn the system off you have to wait about 10-seconds before switching it back on or else the power supply will be disabled. You have to wait the full timeout or the unit won't start.Hope this saves someone else some time & troubleshooting...rastro
Wide base band noise on HP8568B - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: September 09, 2018, 03:53:26 pm
content: I'll follow up with pictures later on but I have a situation going on with some of my HP8568B RF units. I'm using the same display unit for all of them. Cables are same as well.Say I have a full scan, 100Hz to 1.5GHz with nothing connected on input. At bottom there is a band of noise. On some, the band is about 1 scale thick/tall. On some, it's double that.If I scan narrower, say 10Mhz to 30Mhz, with nothing connected on input, the band becomes jumping and waving line. It's no longer a band. On some, it's still a band, about 1 scale high.I'm at loss as to what to make of this. In both conditions, if I put in a test signal, the peak is right on. I don't see any unusual out-of-band signal. I can bang on the unit, handle the cable, etc, and nothing changes. So intermittent connection is probably not a factor. I'm thinking if there is a front-end damage, the change will be more dramatic and random. Yet, this is pretty consistent. Just wider noise band.What do you make of this?I used one that is a reference unit, calibrated one, and it is identical to the "good one"s. 1" on full scan and a line on narrow scan.

author: hendorog
author_rank: Super Contributor
timestamp: September 09, 2018, 06:47:44 pm
content: Are the sweep times, RBW, and VBW settings the same on all of the units you are comparing, and do they all work?By work I mean does changing the VBW change the shape of the noise band?I think by default they power on with all controls in auto mode, but perhaps that can be overridden for an automated system.

author: tkamiya
author_rank: Super Contributor
timestamp: September 09, 2018, 07:59:49 pm
content: Actually, I don't know. I left everything at AUTO mode.I'll have to check. Thank you!

author: rastro
author_rank: Frequent Contributor
timestamp: September 17, 2018, 01:36:51 am
content: Is there any difference if you place a 50-ohm terminator on the input of SA?This would help eliminate external RF noise entering an unconnected input.Have you run any functional tests covered in the service manual?

author: tkamiya
author_rank: Super Contributor
timestamp: September 17, 2018, 11:33:30 am
content: Answer is no. I've tried that.BUT, odd thing now is, it no longer reproduces. It is quite possible something systemic was happening. Thank you for all replies, and sorry, I wasn't as careful. It may have been just some silly mistakes.

author: rastro
author_rank: Frequent Contributor
timestamp: September 17, 2018, 04:02:24 pm
content: Quote from: tkamiya on September 17, 2018, 11:33:30 amI've been down that path at one time or another...
UT61E backlight wire routing - Page 1
Forum section: electronics / testgear

author: seanspotatobusiness
author_rank: Regular Contributor
timestamp: September 17, 2018, 01:50:48 pm
content: I'm putting a backlight into my UT61E DMM, controlled by a cheap TTP223 touch sensor module. I would like to know if my intended location for the module and wiring could affect the accuracy of the meter. I wanted to put the module on the front (there seems to be enough room) to avoid threading my wires from front to back but maybe there's a good reason most mods seem be placed at the back?I did find this image on another forum. Is that the only area sensitive to interference?Thanks!

author: Nisei
author_rank: Regular Contributor
timestamp: September 17, 2018, 03:27:01 pm
content: Check my tutorial here:https://www.eevblog.com/forum/testgear/uni-t-ut61e-backlight-mod-with-touch-sensor-(tutorial)/The pics are showing exactly where I placed the wiring and module and it's working fine that way.

author: seanspotatobusiness
author_rank: Regular Contributor
timestamp: September 17, 2018, 03:29:25 pm
content: Quote from: Nisei on September 17, 2018, 03:27:01 pmUnfortunately the finest wire I have is still too thick to feed through those via holes from the back of the board to the front so I'm hoping for an alternative route.

author: Nisei
author_rank: Regular Contributor
timestamp: September 17, 2018, 03:51:38 pm
content: Why not spend less than $5 and have enough wire for the rest of your life?https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F302864621867
Anritsu MA4601A power sensor cable - Page 1
Forum section: electronics / testgear

author: rodd
author_rank: Regular Contributor
timestamp: September 16, 2018, 09:36:01 pm
content: Hi folks,I need the reference number of the 10 pin cable used in this sensor, and if possible, a possible source for it.The new cables use 12 pins and are not compatible.Any information will be highly appreciated.ThanksEnviado do meu iPhone usando Tapatalk
Does anyone have Hutale 4.2 LCR-DDS-F meter? - Page 1
Forum section: electronics / testgear

author: txescientist
author_rank: Regular Contributor
timestamp: September 16, 2018, 08:29:06 am
content: Does anyone have Hutale 4.2 LCR-DDS-F meter?Is it good? I need LCR meter under 50$...Thanks!

author: hli
author_rank: Frequent Contributor
timestamp: September 16, 2018, 10:46:28 am
content: I build an older version (I think it was 3.5) by myself, and just bought the firmware. I'm quite happy with it. My only improvement was to add some additional button together with LTC6993 monoflops - these trigger the correctly timed button presses for the different modes.The new versiomn has some more features, and seems to improve the accuracy further. (I don't own a real professional LCR meter so I cannot verify this, though).

author: hendorog
author_rank: Super Contributor
timestamp: September 16, 2018, 09:17:20 pm
content: I have one, cant comment about accuracy either due to lack of a reference.Downsides are the ui is very cumbersome and slow to use and the leads are quite short and twisted out of the box. I untwisted them which no doubt adds noise but it was too annoying before that.
Keysight U1281A faulty from new - Page 1
Forum section: electronics / testgear

author: targit
author_rank: Regular Contributor
timestamp: September 16, 2018, 09:31:50 am
content: Hi, Thought I had a good result with getting a new U1281A off eBay (Singapore) for a little over $400AUD, and when it arrived all brand new in the box all seemed well.Reading the manual like all good boys do, and playing around with the setup, I noticed every now and then it would show OL on the DC range, even with no leads connected.I had a play and it seemed to be normal most of the time, then I was trying out the resistance range and it started showing random resistance figures in the KiloOhm range for a known good lead across the inputs. I opened it up and had a look under the microscope and here's what I found..A probe with my trusty old Fluke 85 shows this is open circuit between the pin and the via next to it, and the data sheet says this is the inhibit pin of the 4053 multiplexer.As I don't have a circuit diagram, I can't be certain if this is the fault I am seeing so I dont want to void my warranty (if I haven't already) by "fixing" this joint. It is very tempting though.....

author: Synthtech
author_rank: Regular Contributor
timestamp: September 16, 2018, 09:34:30 am
content: Well spotted!

author: TheSteve
author_rank: Unknown
timestamp: September 16, 2018, 09:58:08 am
content: You've already got it open, just solder that pin. If it fixes it great. If it doesn't I don't see the big deal having it replaced under warranty.This assumes you're comfortable with soldering small parts, if you're not comfortable use the warranty.

author: Muttley Snickers
author_rank: Unknown
timestamp: September 16, 2018, 10:27:29 am
content: Keysight read this forum so before touching up the joint I would probably just wedge a sliver of aluminium foil or similar conductive material in between the pin and pad if there is a gap, then check the meters functionality again. If this doesn't fix the problem then enter the meters details on the Keysight Support page to see if the meter is still within the three year warranty period. Keysight are extremely good in regards to warranty and support, they looked after us well after the warranty had expired so I only have good things to say about them.Keysight Service.https://service.keysight.com/infoline/public/default.aspx

author: perieanuo
author_rank: Frequent Contributor
timestamp: September 16, 2018, 08:11:24 pm
content: put someone with skills in soldering nobody can notice this.life is shortregards, pierreEnvoyé de mon HUAWEI NXT-L29 en utilisant Tapatalk
Wavetek 1002 - Should I steal the nice little attenuator, or get it up to speed? - Page 1
Forum section: electronics / testgear

author: planetplabs
author_rank: Newbie
timestamp: September 15, 2018, 05:15:31 am
content: I'm new to this forum so apologies if this is in the wrong place. This is as much a general question/discussion prompt as a specific one. I'm pretty much over my boat anchor days so everything old and heavy is getting chucked/sold, parted out, or determined to have a high value to weight /volume ratio and will be allowed to stay on my bench.I searched the forum for Wavetek 1002 but didn't find anything. It is an older RF/sweep generator that goes up to about 500 Mhz. The frequency adjustment is very coarse which makes it rather fiddly to use. It works, but it doesn't seem to be quite all there and if it's going to stay on my bench then I would have to spend some time going through it.I only saw one on ebay which someone is asking a laughable $750 or so for. I'm sure that this cost me something between free and $5.Looking inside the attenuator looks like a lovely little bit to rip out for a DIY project, frankly, just having that in a box with a couple of BNC connectors on the front could be useful. I imagine the output amplifier which is in a nice shielded can might also be useful. I'm not convinced the rest is much use, maybe the main oscillator/mixer, I don't know.Anyway, my sense of stuff like this is that it is essentially worthless today. By worthless I mean below the threshold at which I would bother with selling it, which is something on the order of $100, less if I'm going to a hamfest with a bunch of stuff.As a wobbulator I find it too fiddly because the frequency is a single turn pot. I suspect that it's meant for more wideband tuning tasks than the kinds of things that I would use a sweep generator for, e.g., IF filters.Has anyone used one of these? Am I missing something? Is it pure sacrilege to part this thing out?
Digital Oscilloscope with data transfer onto USB memory - Page 1
Forum section: electronics / testgear

author: XaviPacheco
author_rank: Regular Contributor
timestamp: September 16, 2018, 10:06:25 pm
content: Hello,I'm a student. I'm looking for a digital oscilloscope with data transfer onto USB memory. I'm stuck with my project without it. What is the most affordable one? I appreciate your suggestions.

author: tautech
author_rank: Super Contributor
timestamp: September 17, 2018, 12:52:29 am
content: All modern compact DSO's can save to USB.Any recommendations would be useless without fully knowing you needs and budget.

author: XaviPacheco
author_rank: Regular Contributor
timestamp: September 17, 2018, 01:19:28 am
content: I want to see microcontrollers signals, PWMs less than 1 MHz, and FETs signals, like Vgs and Vds. My budget is around 200USD. So far, these ones seem to be the cheapest ones:https://www.amazon.com/Hantek-DSO5072P-Digital-Oscilloscope-Bandwidth/dp/B00RJPXB6Y/ref=zg_bs_393269011_19?_encoding=UTF8&psc=1&refRID=N6TGNYWHH2FDT8H25WB8https://www.amazon.com/Rigol-DS1052E-Digital-Channels-sampling/dp/B003MYND5A

author: tautech
author_rank: Super Contributor
timestamp: September 17, 2018, 01:35:37 am
content: You'll be best to increase your budget some to get more modern equipment.This is the very cheapest from Siglent America:https://store.siglentamerica.com/product/sds1052dl-2/https://www.amazon.com/Siglent-Digital-Storage-Oscilloscope/dp/B06XHJGSMPYou do want the larger 7" display if you can afford it.

author: Fungus
author_rank: Super Contributor
timestamp: September 17, 2018, 02:26:02 am
content: Quote from: tautech on September 17, 2018, 01:35:37 amI agree.Quote from: tautech on September 17, 2018, 01:35:37 amBut you shoulddefinitelytry to get four channels if you're into "microcontrollers".

author: Relaxe
author_rank: Regular Contributor
timestamp: September 17, 2018, 05:25:10 pm
content: May I suggest the PicoScope 2204Ahttps://www.picotech.com/oscilloscope/2000/picoscope-2000-overviewThe interface software is great and it decodes any serial bus you can imagine.It, obviously, acquire all data to be saved to many file formats.And if the Pico does not fit your needs, I agree that saving for Rigol/Siglent in the 400$ range is a good advice.
[DONE]Siglent SDS1104X-E vs Rigol DS1054Z - Page 1
Forum section: electronics / testgear

author: Thalhammer
author_rank: Contributor
timestamp: September 23, 2018, 10:17:40 pm
content: Hi EEVBlog,I'm currently in the process of buying a DSO (as well as a Saleae logic.My Budget is at most 600€ but < 500 would make me sleep a lot better.My two candidates are the Siglent SDS1104X-E which I get for about 510€ and the Rigol DS1054Z which costs me around 400€ but includes all upgrades.I have read that one can hack the Rigol into a larger model with 100mhz bandwidth (and other features, but I get those with the deal anyway), which I'm pretty sure don't need yet but I might some time down the road. Considering this it looks like the Siglent has fewer features than the rigol for a higher price.Am I missing something?It seems like this is a really good deal for a new DSO but this is my first one so it might just be lack of knowledge.My workload will mainly be "slow" analog, so most likely nothing above 5Mhz and pretty sure nothing above 20 or so.Sincerely, Thalhammer

author: nctnico
author_rank: Super Contributor
timestamp: September 23, 2018, 10:51:24 pm
content: There is already a thread with this exact subject:https://www.eevblog.com/forum/testgear/siglent-sds1104x-e-vs-rigol-ds1054z-advice/

author: Thalhammer
author_rank: Contributor
timestamp: September 23, 2018, 10:57:44 pm
content: Ah cool.I did search for both models here and for some reason it didn't show up.Consider this thread closed.
Valuable $10-20 DMM for 2018-19 winter? - Page 1
Forum section: electronics / testgear

author: 001
author_rank: Super Contributor
timestamp: September 18, 2018, 09:20:30 am
content: Any Valuable $10-20 DMM for 2018-19 winter?You can say CAT ratings sucks for this buget ... Any sign is misery... 250v rated fusesYeaIt does not matter Don`t worry becouse nobody know his death dateI`m looking for cheap but usable meters (like 830 many years ago)(to save my flukes from hosehold duties)

author: Fungus
author_rank: Super Contributor
timestamp: September 18, 2018, 10:18:40 am
content: ANENG 860B+

author: HKJ
author_rank: Super Contributor
timestamp: September 18, 2018, 12:28:40 pm
content: You can always check my list for ideas.

author: 001
author_rank: Super Contributor
timestamp: September 18, 2018, 07:30:52 pm
content: any opinions?
New Cleverscope CS448 1kV Isolated, 14 bit 4 Channel Oscilloscope - Page 1
Forum section: electronics / testgear

author: snoopy
author_rank: Frequent Contributor
timestamp: August 29, 2018, 05:12:19 am
content: Will be on display at the Electronex show in Sydney. Worth a look if anyone is going.https://cleverscope.com/news/cs448/Quote

author: snoopy
author_rank: Frequent Contributor
timestamp: September 14, 2018, 12:52:31 am
content: Checkout Daves impromptu review of this very impressive scope

author: tautech
author_rank: Super Contributor
timestamp: September 14, 2018, 05:29:06 am
content: And discussion about the PSU's required to power the isolated front end.https://www.eevblog.com/forum/projects/what-kind-of-transformer-is-this-(eevblog-1119)/

author: egonotto
author_rank: Super Contributor
timestamp: September 14, 2018, 03:22:11 pm
content: Hello,i exist since 21.1.2018 a short review in german:https://youtu.be/FmbtjOh6dTIBest regardsegonotto