hybridfree/eevblog-posts huggingface dataset:
Pulsar PSU - Page 1
Forum section: electronics / testgear

author: kcs
author_rank: Regular Contributor
timestamp: August 15, 2017, 03:17:32 pm
content: I was looking for a SMPSU (12V, ~3A) for a home security system. I wanted it to have an UPS function, so that it could be powered from a battery under power failure, and I also wanted it to be able to detect when battery is low. The only thing I could find was a PSU made by Pulsar (Poland). Maybe someone will find it interesting to see higher resolution photos of its insides. All the caps are branded as DTDZ. Overall, I was not impressed. Does anyone know any similar but better built products?

author: IAmBack
author_rank: Regular Contributor
timestamp: August 15, 2017, 09:41:44 pm
content: Aren't DTDZ capacitors a Chemi-con products?http://www.o2xygen.com/photo/dtdd2e474k/dtdd2e474k_001.pdf

author: kcs
author_rank: Regular Contributor
timestamp: August 15, 2017, 11:42:23 pm
content: No, I don't think so.

author: 0xPIT
author_rank: Regular Contributor
timestamp: August 16, 2017, 05:06:43 pm
content: If you were OK with using 3 of these:https://www.pollin.de/p/usv-converter-concepts-adxc0017-ausgang-12-v-350245it would at least be cheaper

author: kcs
author_rank: Regular Contributor
timestamp: August 16, 2017, 06:57:16 pm
content: For that price, it looks to be a good one and it is better built:https://www.mikrocontroller.net/attachment/326001/20170404_230137.jpg

author: kcs
author_rank: Regular Contributor
timestamp: August 22, 2017, 10:06:00 pm
content: Quote from: 0xPIT on August 16, 2017, 05:06:43 pmDid you happen to have a datasheet for that device? I am very tempted to buy a few of those, but there is almost no information available about it.I would like to know if it has short circuit, overload and battery cut-off protections and if it can indicate when battery is low.

author: LaurentR
author_rank: Frequent Contributor
timestamp: August 22, 2017, 10:18:45 pm
content: Have you looked at products from alarm companies.For instance, in my alarm panel, I have one of these:http://www.elkproducts.com/products/elk-p212s-supervised-remote-power-supplyto run some auxiliary functions that are higher current than supported by the main alarm panel.They are one the popular DIY-friendly manufacturers in the US. They have several power supply products that could meet your requirements.
HP 8568B (85680B) H16/ OPT E16 ???? - Page 1
Forum section: electronics / testgear

author: xwarp
author_rank: Frequent Contributor
timestamp: August 22, 2017, 02:53:35 am
content: I could swear there was a thread somewhere here regarding a weird option for the 8568B, but for the life of me, I can't find it.In any case, does anyone have any idea what the H16 or E16 option is?Thanks!

author: MadTux
author_rank: Frequent Contributor
timestamp: August 22, 2017, 08:12:12 am
content: Looks like it has increased frequency span, 1,65GHz instead of normal 1,5GHz. If you look at these pictures, you can see it at the input:http://www.ebay.com/itm/HP-8568B-Spectrum-Analyzer-OPT-H-16-With-HP-85622A-Display-Buss-Cables-Included-/292196009102?https://www.eevblog.com/forum/testgear/hp-8568b-repair-with-a-screwy-story/?action=dlattach;attach=137645;imageBe careful with other "options" though, OPT462 and OPT E96 are nothing but misery for normal users.

author: xwarp
author_rank: Frequent Contributor
timestamp: August 22, 2017, 11:48:00 am
content: That seller HAD two of those. I took one home because the price of it was unbelievably low since it did not have cables, but I took care of that problem rather inexpensively.Thanks for pointing out the 1.5Ghz 1.65Ghz difference. I might have never noticed that, and, maybe that is what the E16 stands for "expanded 1.6Ghz"?There are no other options on this unit.
Burster Digistant 4405 Calibartion Source Teardown - Page 1
Forum section: electronics / testgear

author: kilobyte
author_rank: Regular Contributor
timestamp: October 30, 2016, 06:34:56 pm
content: I want to share some pictures of the Burster Digistant 4405 Calibration Source that i got on Ebay. Build Date of this Device is 16 March 1990 according to the type plate.Voltage range 10 µV to 11.000 VCurrent range 2 µA to 22.00 mASome technical data from the Datasheet:It was not that well packed, so I decided to take it apart.I noticed that the 2716 ROM didn't sit correctly in its socket. This was one reason more to take it apart.They have used a CDP1802 as the CPUhttps://en.wikipedia.org/wiki/RCA_1802.

author: kilobyte
author_rank: Regular Contributor
timestamp: October 30, 2016, 06:38:42 pm
content: Part two, the board where the magic happens.The Main Components are:ICL7134 14Bit DACREF01 as the Main ReferenceThe 10V Range ist a bit off with 10.011V.I also think the old NiCd Cells needs to be replaced.Does anybody have a full manual for it?

author: Vgkid
author_rank: Super Contributor
timestamp: October 30, 2016, 10:25:57 pm
content: Thanks for the teardown. Amazing how much smaller those portable calibrators can get now .

author: adrie
author_rank: Newbie
timestamp: August 11, 2017, 08:37:36 pm
content: Thanks for the pictures. I guess the battery pack has 5 cells, so about 6 V. Do you happen to know what the original power supply voltage was, or what range the charge circuit tolerates?

author: kilobyte
author_rank: Regular Contributor
timestamp: August 11, 2017, 10:43:12 pm
content: I can't find my notes for the original power supply at the moment, but I think it was something like 12,8VDC with round about 800mA.12V connected to the DC jack works also.The cells(Sanyo KR-2000C) on my 4405 are mostly dead and need to be replaced for use without the power supply.NiCd cells are still available for about 4-5€Maybe I will reverse engineering the power supply/charger pcb on a rainy day during my vacation

author: adrie
author_rank: Newbie
timestamp: August 12, 2017, 02:02:59 pm
content: By the way, I recently acquired one of these as well. I like the user interface.Did you figure out which potentiometer adjusts which range? I'm guessing there is a gain and offset for each of the four ranges.If you don't know, I may send a mail to Burster--who knows, maybe they will answer.

author: adrie
author_rank: Newbie
timestamp: August 22, 2017, 08:22:40 am
content: Here is the manual (in German) including calibration instructions. Thank you Burster!

author: kilobyte
author_rank: Regular Contributor
timestamp: August 22, 2017, 08:35:33 am
content: Great to have a manual with calibration instructionsI used an online contact form in the past, but never got an answer.

author: The Soulman
author_rank: Super Contributor
timestamp: August 22, 2017, 09:12:12 am
content: Quote from: kilobyte on August 22, 2017, 08:35:33 amI've contacted them for manual for the digistant 6425 T a while ago, they where very responsive and help-full.
HP 8711A/B stuck keys? - Page 1
Forum section: electronics / testgear

author: wd5jfr
author_rank: Regular Contributor
timestamp: August 20, 2017, 10:09:38 pm
content: Just acquired one with 8711A on panel but after booting it shows 8711B so I guess it's been upgraded. The first problem was that several of the rubber keypads were stuck under the panel and I was able to get them to pop out, ( I wonder if this was abuse by a disgruntled employee?). The second problem is that it doesn't always respond to button pushes more so with the soft keys. The AVG, CAL, and FORMAT key pads not seem to be protruding as much as the rest. Haven't had a chance to open it up but I wonder what kind of membrane matrix iOS under the panel and if it's fixable or replacements are available.? Is it a big job to get under the front panel for a look see? I also see there's a DIN plug on the back for an IBM PC keyboard and if I can find one can I control the unit with the keyboard before I have to tear into it?ThanksHank WD5JFR Green Valley AZ

author: TheSteve
author_rank: Unknown
timestamp: August 20, 2017, 10:40:32 pm
content: The front comes off very easily if the screws on the front edges are removed. There is one ribbon cable that connects it to the chassis. Someone likely kept pushing harder and harder on the keys as they stopped responding. Once the front panel is removed you can easily remove the PCB, clean the board and the push buttons with alcohol and reassemble. Chances are it will work a million times better. I have done that with a few VNA in the series now all with excellent results. The disassembly diagram is usually on a sticker on the bottom of the unit.

author: wd5jfr
author_rank: Regular Contributor
timestamp: August 21, 2017, 03:31:14 pm
content: Well I took it apart last night and could see that the keys were pressed so hard that several of the snap retaining clips were disengaged and one broken, so the keyboard pcb was not correctly in place. So I pushed the board back in position and it worked a bit better but not right. So I disassembled again and separated the keyboard circuit board totally and found that the silicon button substrate was torn between the middle softkeys. One of those buttons was hit so hard that the snap retainer was broken and the stress on the silicon button substrate caused it to tear. I taped across the tear with some scotch tape, cleaned the pads with a qtip and alcohol and after assembly it worked a lot better but several buttons require real hard pressure or multiple attempts. So I guess I can live with that till I find a good used keyboard or total front panel. Any tips on a surplus panel appreciated. Now to try to learn how to use it and see if I can figure out a way to use it for 50 ohms because it's 75. I live in an HOA with antenna restrictions so this 8711b should help me especially if I can get meaningful use with 50 to 75 adapters and then get the eprom upgraded so I can do Smith chart plots.Hank WD5JFR
Need SysComp Mac software - download links broken.  - Page 1
Forum section: electronics / testgear

author: Chalky
author_rank: Regular Contributor
timestamp: August 17, 2017, 06:40:58 am
content: Help! Can you help me get a copy of SysComp's Mac software for WGM-201 waveform generator? Their download links for Mac have all been broken for a while, and I can't get any response from SysComp.Seehttp://www.syscompdesign.com/Downloads_ep_44.htmlThanks!

author: JFJ
author_rank: Regular Contributor
timestamp: August 17, 2017, 05:10:16 pm
content: You can download the software from a cached copy of the SysComp web site on the Internet Archive:https://web.archive.org/web/20161031080926/http://syscompdesign.com/Downloads_ep_44.html

author: Chalky
author_rank: Regular Contributor
timestamp: August 20, 2017, 10:18:54 pm
content: Do you know, I'd tried that, without success, but your link to 2016-09-15 worked. Cheers!I gave up trying to contact SysComp, I got in touch with Saelig, who re-sell SysComp, turns out their webhost now blocks DMG files. SysComp have not put all their Mac DMGs inside ZIP files and updated their website.
Data Precision 8200 IEEE-488 - Page 1
Forum section: electronics / testgear

author: deepskyridge
author_rank: Regular Contributor
timestamp: June 10, 2016, 11:30:39 pm
content: I just got a DP 8200 standard and it work fine in local mode (from front panel). I cannot get an output using the IEEE-488 interface. Does anyone have the docs for this option. They are not in the service manual.ThanksGary

author: e61_phil
author_rank: Frequent Contributor
timestamp: August 19, 2017, 07:43:11 pm
content: Did you make any progress?

author: eurofox
author_rank: Unknown
timestamp: August 19, 2017, 09:58:47 pm
content: Quote from: deepskyridge on June 10, 2016, 11:30:39 pmI have the service manual but it is to big to upload. I is available on the net but don't remember where

author: alm
author_rank: Super Contributor
timestamp: August 20, 2017, 07:54:49 am
content: There are some DP 8200 service manuals availableat KO4BB's site. If you have something that is not there,uploading it to KO4BBwould be useful.Looks to me like the command syntax is on page 2-2 ofthis service manual. Looks like a listen-only device. If the output does not change, there is most likely an error in the command string you are sending, since it appears it does not have any error reporting.

author: 0xPIT
author_rank: Regular Contributor
timestamp: August 20, 2017, 09:52:11 am
content: OT: anyone of you 8200 owners have the 1000V option?

author: e61_phil
author_rank: Frequent Contributor
timestamp: August 20, 2017, 10:01:52 am
content: Ahh...It seems to me, like you have to send the complete set of characters every time. To set +7V for example, you have to send "V1+07.00000" that seems to work.I tried a lot of time with the "L" command, because I thought one can't do anything wrong with just one character, but it still doesn't remove the "REM" light.But that is ok. I can control it via GPIB, now@0xPIT: Mine has no 1kV option.Another problem I have is the linearity calibration. It seems to me, like one of the steps cannot be tuned, because the pot is already at the end. Therefore, it seems like I have to replace a resistor. Shouldn't be a great deal, I think.
Linear scale of RCL bridge PM6302 Philips - Page 1
Forum section: electronics / testgear

author: sandor626
author_rank: Regular Contributor
timestamp: August 18, 2017, 06:01:04 pm
content: Hi,My bridge's scale does not want to work anymore: the teflon inner ring is broken, so the index ribbon does not flow freely over it. This is a very rare component. Does anyone know which dealer sells it?

author: markce
author_rank: Regular Contributor
timestamp: August 18, 2017, 07:40:40 pm
content: Are you sure the ring is teflon?A picture of the ring, a part number and a drawing would be helpfull.
ProPlus (Celestry) 9812B Noise Analyser User Manual - Page 1
Forum section: electronics / testgear

author: tec5c
author_rank: Frequent Contributor
timestamp: August 18, 2017, 01:07:25 pm
content: Hi all,I have bought a Celestry (now known as ProPlus) 9812B 1/f noise analyser online however all efforts at finding any documentation on this bit of equipment have resulted in nothing. Even though this bit of gear has been superseded by the 9812D and just recently the 9812DX I still cannot find a user manual for any revision.I have looked all over the internet, contacted ProPlus (no response) and yet still nothing. This line of equipment is claimed to be the golden standard in the industry, so one would think that there would be some documentation available?If anyone has a copy or knows of where I could locate one then I would be most appreciative. Even if you have experience with this bit of gear, I'd love to pick your brain.
Fluke 8020A LCD display - Page 1
Forum section: electronics / testgear

author: IconicPCB
author_rank: Super Contributor
timestamp: August 20, 2017, 09:42:24 pm
content: Recently ( a couple of weeks ago ) I had cause to take my old vintage 1980 Fluke 8020A DMM out into the field literally to work on a wood chipping machine.The day was bright and warm, the job lasted about 5 hours and by end of day the LCD display had developed some random black spots.I was wondering if there were any similar experiences with the display and whether this is going to progress and become detrimental.

author: Fungus
author_rank: Super Contributor
timestamp: August 21, 2017, 12:21:07 am
content: Quote from: IconicPCB on August 20, 2017, 09:42:24 pmYes. 8020A displays are very fragile. It's surprising that it lasted this long.Quote from: IconicPCB on August 20, 2017, 09:42:24 pmVery probably.

author: lowimpedance
author_rank: Super Contributor
timestamp: August 21, 2017, 12:48:11 am
content: As Fungus said it is surprising it has not gone black already. All is not lost though you can with a little bit of work fit a new LCD and the meter will be good to go for many decades again..See my first post on this forum about my 8020a and a very black display.https://www.eevblog.com/forum/chat/recovery-of-an-old-fluke-8020a-with-a-bad-lcd/msg31154/#msg31154And to find a nice write up on how to do it see Modemheads blog on how he did his.

author: IconicPCB
author_rank: Super Contributor
timestamp: August 21, 2017, 03:44:48 am
content: QuoteIt has LED a sheltered existenceEDIT: thanks for the link
Global Specialties 1320 Triple Output DC Power Supply? - Page 1
Forum section: electronics / testgear

author: Lee Leduc
author_rank: Regular Contributor
timestamp: December 10, 2015, 03:58:30 pm
content: I'm looking for a basic triple output power supply. Computer control is not required.Is anyone familiar with this power Supply? Any opinions would be welcome.http://www.globalspecialties.com/test-equipment/power-supplies/816-1320.htmlThank you

author: pascal_sweden
author_rank: Super Contributor
timestamp: December 10, 2015, 04:16:56 pm
content: I would be very careful with opening that URL link. My virus killer started playing bells and whistles, and raised security warnings about this website

author: rdl
author_rank: Super Contributor
timestamp: December 10, 2015, 04:32:48 pm
content: My observation over the years has been that Global Specialties primarily targets the educational sector and their products seem to be priced accordingly.

author: SpambotPrime
author_rank: Newbie
timestamp: August 16, 2017, 06:54:22 pm
content: Sorry for resurrecting an old thread, but I'm also looking at this supply. Does anyone have any experience with it?It's the cheapest supply with 2 or more variable outputs:https://www.digikey.ca/short/31mrpd
Siglent SSA3032X 9kHz - 3.2GHz Spectrum Analyzer Review, Teardown & Experiments - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: August 13, 2017, 11:56:42 pm
content: You can watch it here: [1 Hour]youtu.be/Fn7uaEVeOPkMore videos at The Signal Path:www.TheSignalPath.com

author: TheSteve
author_rank: Unknown
timestamp: August 14, 2017, 08:13:42 pm
content: Shahriar thank you for another video with great detail.At around 31:50 you mention the front of the antenna as being a reflector, I would have thought it was more of a director myself.When doing return loss the portion of the LCD used seemed very small with poor resolution - is that the best you were able to get?

author: Hugoneus
author_rank: Frequent Contributor
timestamp: August 14, 2017, 08:31:03 pm
content: Quote from: TheSteve on August 14, 2017, 08:13:42 pmYou are right. I meant to say it is a coupled plate for gain and directivity.The built-in app for measuring return-loss is as you saw it. I could not modify it.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: August 15, 2017, 02:55:27 pm
content: Siglent has also noted that if you have any questions, please send them an email.
Teardown & Repair of a SRS DS345 30MHz Synthesized Function Generator - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: August 14, 2017, 01:02:39 pm
content: You can watch the video here: [30 Minutes]youtu.be/SKUT11VDuXcMore videos at The Signal Path:www.TheSignalPath.com

author: Arjan Emm
author_rank: Regular Contributor
timestamp: August 14, 2017, 01:40:03 pm
content: Hello Shahriar,thanks for the great videos i watch them all the time.I noticed something in your video about the sync cpr error. It might not be a level problem, but actually a synchronization error between the sync and function outputs.At 4:40, after the generator started up without error, the scoop shows the two outputs perfectly in phase/sync. The zero crossings line up nicely.At 6:14 the sync out put is slightly ahead of function output. This is only a little bit before you turn the generator off and on and the error shows the first time.At 7:38 and 8:24 with the error the sync is delayed compared to the function output. After fiddling with the pot the error disappeared and at 18:51 the two outputs are perfectly aligned again.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: August 14, 2017, 06:41:58 pm
content: Quote from: Arjan Emm on August 14, 2017, 01:40:03 pmInteresting! Thanks.

author: bitseeker
author_rank: Super Contributor
timestamp: August 14, 2017, 07:16:01 pm
content: Thanks, Shahriar. That was a fun puzzle.I wonder what that long bodge resistor(?) is about on the upper PCB.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: August 15, 2017, 03:34:22 pm
content: Quote from: bitseeker on August 14, 2017, 07:16:01 pmYeah, not a pretty sight! Seems to go to the ribbon cable.
Heathkit Model T4 Aural Visual Signal Tracer - Page 1
Forum section: electronics / testgear

author: jcrubin
author_rank: Frequent Contributor
timestamp: July 24, 2017, 01:19:56 pm
content: This thread documents the restoration of the T4Video 1 of 5https://youtu.be/91TeWRYuFFoVideo 2 of 5https://youtu.be/nDS8HUKxMRw

author: jcrubin
author_rank: Frequent Contributor
timestamp: July 31, 2017, 12:21:52 pm
content: Video 3 of 5https://youtu.be/OTnnLz6xzHY

author: jcrubin
author_rank: Frequent Contributor
timestamp: August 07, 2017, 12:03:50 pm
content: Video 4 of 5

author: jcrubin
author_rank: Frequent Contributor
timestamp: August 14, 2017, 12:37:44 pm
content: Video 5 of 5
"eBay test gear lot", part 1: Keithley 191 - Page 1
Forum section: electronics / testgear

author: Bendba
author_rank: Regular Contributor
timestamp: August 13, 2017, 01:25:15 pm
content: Hi,As some may know, I recently purchased this massive lot of aviation test gears from eBay:http://www.ebay.com.au/itm/263014645608I'll be sharing some details about most of them as I get to identify, test, fix, use or scrap them. So, many old gears tear downs to come.The first one on the list is a Keithley 191 bench DMM, with AC option installed.I was really hoping this one would "plug and play" but not quite. As I plugged it in and turned it on, it blinks, alternating between 1. (as in the photo) and -0.00000Which, according to the notes on the case means overload.But nothing is connected to it.It doesn't read anything in any of the ranges of any function.I left it on for a while as I thought maybe something was temperature sensitive, but no improvement. After a few minutes, the display just blanked.So, some troubleshooting to do there. I downloaded the manual and I am investigating, praying that it's not a damage ROM.Here are a few photos of the meter.PS: Please, let me know if another section of the forum would be more appropriate for those ancient test gears discussions.
Interesting (and amusing) Siglent power supply issue - Page 1
Forum section: electronics / testgear

author: Gary350z
author_rank: Regular Contributor
timestamp: August 13, 2017, 05:50:07 am
content: While browsing YouTube I came across the following video:

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: August 13, 2017, 10:23:09 am
content: This has been linked to before. I have a SPD3303X-E and have tried but been unable to reproduce anything like this, I also think (not sure) that others have tried and failed to reproduce this 'issue' leading to speculation that it was a 1-off bad unit.I bought my SPD3303X-E after watching Dave's teardown - the internals are excellent, especially the huge toroid transformer.I am VERY happy with my SPD3303X-E power supply; the latest firmware shows the set volts/amps in small font with the measured volts/amps in large font and I'm impressed with the accuracy of the measured outputs.
Hioki 3244-60 Pocket Multimeter - Page 1
Forum section: electronics / testgear

author: Locator
author_rank: Contributor
timestamp: August 12, 2017, 04:24:16 am
content: Hello. Has anyone used one of these small Hioki 3244-60 multimeters? If so, how do you like it? How is the continuity testing function?I have several larger MMs, but am looking for a small one. I recently purchased a Uni-T UT120C, but am disappointed with the continuity tester on it. It's extremely scratchy and weak sounding. I would like something better.Thanks much.
Vintage Multimeter/tester question - Page 1
Forum section: electronics / testgear

author: n3vti
author_rank: Contributor
timestamp: August 10, 2017, 04:13:01 am
content: Hello everyone,I'm looking for some help looking for a particular model. We've all seen Dave's first DMM, and I got to thinking about what mine was. At first I thought it was a RadioShack True-RMS handheld type (model 22-174) that I got for my 18th birthday. However, I remember building one when I was about 12 or 13 years old. During my freshman year in high school, we were given a multimeter kit that we had to solder and put together. Sure, it wasn't all that accurate, but it did the super basic of things. It was about maybe 4 inches tall and about 2-3 inches wide. It was a light blue in color. I don't remember who made it, but it looks very similar to the Micronta 22-027 model.Anyone have any ideas?Thanks!

author: floobydust
author_rank: Super Contributor
timestamp: August 10, 2017, 04:51:21 am
content: Are you talking about a vintage analog or digital multimeter kit?My first DMM was the Sabtronics 2000kitcirca late 1970's. I have the manual and stuff, not sure if it's in my junk box lol.It is blue, a kit, and quite old.picture is copy pasta from a ham sale

author: floobydust
author_rank: Super Contributor
timestamp: August 10, 2017, 04:57:26 am
content: Reread your post, I'm half awake.How about Radio Shack’s ArcherKit Multimeterkit28-4012AI had the same meter (before the Sabtronics) but can't remember if I soldered it together, but it's that old blue colour...The assembled Micronta 22-027 one is black.

author: n3vti
author_rank: Contributor
timestamp: August 12, 2017, 04:05:17 am
content: Bingo, that's it. I loved that little meter, even if it wasn't all that great. I think I will attempt to find one. What's another meter... I only have about 8 multimeters(All RS, except for one Fluke... should probably get rid of most of them and get the Bryman 235 eevblog one)
Sylvania Electric Products type 112 oscilloscope - Page 1
Forum section: electronics / testgear

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: August 06, 2017, 06:10:24 am
content: Does anybody know where I can get a schematic for an old oscilloscope. I bought it a few years ago at an antique store in Ontario for $85. It is a Sylvania Electric Products type 112.It looks like this:http://www.radiomuseum.org/r/sylvania_oscilloscope_112.htmlI plan to get around to it sometime this month but I would like to have the schematic in hand when I start. Any help will be appreciated.Thanks, Tim

author: floobydust
author_rank: Super Contributor
timestamp: August 06, 2017, 08:37:06 pm
content: I could only find aSylvania Model 108 Operating manual (has schematic).It might be close to the model 112, they look very similar. Certainly used in World War II with the "beam off" switch?; circa 1939-1940 I'd guess. OMG weighs 58lbs!I really like the headphone terminals on most of these, connecting to the vertical-deflection plates. I've never listened to an oscilloscope before, at 250V no less. Wow.The 1939 Sylvania 104 dual-trace optionat Hackaday.I think I'm in love.

author: basinstreetdesign
author_rank: Frequent Contributor
timestamp: August 12, 2017, 01:22:11 am
content: Thanks loads. Even if it isn't EXACTLY like mine it should be close enough.
Keysight 3000T. Mask testing and segmented memory - Page 1
Forum section: electronics / testgear

author: sibeen
author_rank: Frequent Contributor
timestamp: August 05, 2017, 07:29:20 am
content: Is there any way that you can use mask testing in conjunction with segmented memory on this unit. I would like to be able to set up a mask on a 240V mains waveform and then using segmented memory be able to closely examine each occurance of a failure, similar to what can be done with zone triggering etc.And a follow up question, I cannot save a Mask (*msk) file to a usb. The 'file name' and 'press to save' soft keys remain dim and pressing them only brings up the "The selection is not available in this mode". I have tried with the cro in run and stop modes. Any hints?

author: sibeen
author_rank: Frequent Contributor
timestamp: August 08, 2017, 12:52:18 pm
content: Bumping this up the once on the off chance that Daniel, or someone else, from keysight spots it on the list.I should have also pointed out in the original post that the cro has the latest version of software installed (07.11) and it also comes with the full application pack minus the MSO.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: August 08, 2017, 08:34:07 pm
content: Hi! Sorry, just getting back from vacation, thanks for the bump. I don't believe that the mask testing works in conjunction with segmented memory, and mask files should be save-able to USB. I'll double check with my scope and reply here.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: August 09, 2017, 11:18:42 pm
content: I've confirmed that segmented memory and mask testing cannot be used at the same time nor would a software update make it possible.I'm able to save a mask to USB with the latest firmware, can you try doing a secure erase and see if that helps? Also, make sure you have "usb" selected in the location. Finally, try a different flash drive?If none of those work, can you post a pic of the issue?Thanks!

author: sibeen
author_rank: Frequent Contributor
timestamp: August 11, 2017, 09:15:50 am
content: Daniel, thanks for your response to this and responding to my follow up question before I even got to ask it. Well playedAs to the issue of saving the .msk file I strongly suspect that there may have been a*cough*fair*cough*chance that there was a PEBCAK error involved somehow.

author: Keysight DanielBogdanoff
author_rank: Unknown
timestamp: August 11, 2017, 03:46:09 pm
content: I've been around long enough to anticipate the software question. I'm glad the save is working now, PEBCAK errors are definitely the easiest ones to fix!
AEMC SR759 AC Current Clamp Teardown and Q's - Page 1
Forum section: electronics / testgear

author: noidea
author_rank: Unknown
timestamp: August 10, 2017, 03:48:12 pm
content: Hi AllI purchased an AEMC SR759 AC current clamp recently after finding one for a good price on fleebay and realising that it was the same as the Chauvin Arnoux C-173 that is a jack of all trades for AC current measurement from 1-10-100-1000A and with a 1V/ Amp output on the 1A scale useful for doing earth leakage current measurements. Anyway I have used it so far with my Keysight U1252b and Fluke 196C and its worked well except that I've only been able to use the multimeter inputs on the scope as the output lead is banana plugs not a BNC.Now that my leakage current issues have been sorted I want to try to see if it's useful for doing some standby power measurements with the Fluke 196C but for that I need to use it on one of the scope inputs so I can use the math functions. The easy way I guess is to just buy a dual banana socket to BNC plug adapter but the isolated plastic Multicontact / Fluke ones are not cheap and it will also make things a bit unwieldy and more likely to get damaged as I take the meter out on site with me regularly.So I am thinking of buying a pre made Multicontact coax test lead with the insulated BNC plug on it, cutting the end off and swapping the output lead over as most of the time I will be using it with the scope rather than the meter so would prefer this anyway. I know that other versions of what appears to be the same basic clamp design are available with a BNC lead attached but with different current range switch options. The AEMC SR661, Chauvin Arnoux C160 and Tektronix A621 all appear to be identical and use the same clamp casing / materials but I don't know if the little board inside with the range switching is the same.I took it apart today and took some photos which are below, I knew that the outputs for each range had adjustment pots but I was surprised to see in what I thought was a passive device (beginner electronic understanding) that the two current transformer coils are feeding into BC547 transistors. The board also looks slightly generic as it has the tabs for mounting banana sockets to it that is another option.Am I overthinking this, should I just leave it as is and use an adapter to change it to a BNC output?Or if anyone has one of the clamps above do you mind opening it up and sharing some pictures of its insides?
How to read Siglent DAV files (Rigol?) - Page 1
Forum section: electronics / testgear

author: tarantula
author_rank: Contributor
timestamp: August 10, 2015, 02:54:17 pm
content: Hi,I have a Siglent SHS1102 oscilloscope and it's software is pretty shitty. The csv export doesn't work, and I'm stuck with the ability to save BMPs of the low res screen or DAV files. Those files contain all the memory of the scope plus settings and the scope itself can read them. However, the Siglent Software cannot. Does anybody know how to read those files? Since the software of the scope looks like a total Rigol rippoff, maybe there is something from this side that might be able to read the file?

author: abraxa
author_rank: Frequent Contributor
timestamp: August 10, 2017, 07:53:00 am
content: Quote from: tarantula on August 10, 2015, 02:54:17 pmI, too, don't know how to read these. However, judging fromhttp://www.batronix.com/pdf/Siglent/SDS1000X/SIGLENT_Digital_Oscilloscopes_RemoteControlManual.pdfit seems that the DAV format follows the "waveform template" format that Siglent uses. Unfortunately, I couldn't find a description of that template anywhere. Since Siglent also built the WaveSurfer 3000 for LeCroy and LeCroy started the waveform template concept, it's possible that they use the same format.Alternatively, you could reverse-engineer the format and document it on the sigrok wiki, along with some DAV files. Then, someone can write an input module for DAV files.

author: alm
author_rank: Super Contributor
timestamp: August 10, 2017, 12:24:12 pm
content: I would expect tarantula to have found a solution or workaround sometime during the part two years.

author: abraxa
author_rank: Frequent Contributor
timestamp: August 10, 2017, 03:16:40 pm
content: Quote from: alm on August 10, 2017, 12:24:12 pmArgh, good point...Didn't notice the date
Rohde & Schwarz CMU200 CMU-B95 ADDITIONAL RF GENERATOR removal? - Page 1
Forum section: electronics / testgear

author: Ringmodulator
author_rank: Regular Contributor
timestamp: June 24, 2017, 09:10:39 am
content: Hi,for my understanding, the CMU-B95 ADDITIONAL RF GENERATOR limits the max RF input to 2W.Is it sufficient to remove this unit, to be able to use the full RF input of 50W, or do I need some kind of "jumper cable" to bridge the connections of the removed board?Chris

author: Ringmodulator
author_rank: Regular Contributor
timestamp: July 26, 2017, 09:53:23 pm
content: My further investigation turned out, that the B95 is mounted directly to the RF frontend module and replaces the heatsink with air channels and fan of the standard frontend module.So simply removing the B 95 module will not work, as the heatsink with the fan will still be missing.If someone has a defective unit, I would be interestef in the heatsink and fan. Please feel free to contact me.

author: RF_fanatic
author_rank: Regular Contributor
timestamp: August 03, 2017, 09:57:50 pm
content: You would need a different frontendI do not have my data here but I think you need a 1100.3120.02 module and probably now have a 1100.3120.04 or similarI can check if you want when I'm back in the hobby lab.

author: CJay
author_rank: Super Contributor
timestamp: August 04, 2017, 10:43:59 am
content: Interesting, so is the front end different inside or is it just the lack of heatsink and fan that limits it to 2W...I have both types, if I get a day spare I might investigate.

author: sparkchaser98
author_rank: Newbie
timestamp: August 10, 2017, 05:04:30 am
content: I'm curious about this issue too! I just purchased a CMU200 online and it has a sticker saying 2W on the front as well! I haven't actually received the unit yet so I can't see what options it has yet. But I need to be able to measure 40 watt VHF mobile radios, and I was hoping to do so without worries of needing an additional attenuator or such. So, if there were a simple mod to handle 50 watts that would be great! But what would the tradeoffs be?

author: oh2ftu
author_rank: Regular Contributor
timestamp: August 10, 2017, 06:27:18 am
content: Just use a suitable pad. It can be preprogrammed into the CMU (Attenuation values per frequency).Even Motorola recommends using a 20dB pad while tuning their radios. Just in case.

author: Ringmodulator
author_rank: Regular Contributor
timestamp: August 10, 2017, 12:18:41 pm
content: Thank you for all the responses.Quote from: oh2ftu on August 10, 2017, 06:27:18 amYes, that was also my thought and I am awaiting the delivery of a 20dB/50W attenuator.
RIGOL DS1000z & DS2000a Record Problem - Page 1
Forum section: electronics / testgear

author: Matthew
author_rank: Newbie
timestamp: August 09, 2017, 04:16:47 pm
content: I have been looking around on the forum and can't seem to find this problem discussed. Maybe I'm overlooking it.When I try and record an I2C signal triggering on the SCL line the recording will start but will never finish the recording. It just sits on the first or second frame with the record light flashing on theDS2000a & (2/24) frame recorded on the DS1000z). It never records the last frame of the sequence. Acting as though there was no change in the signal so it has nothing to record. But if I single shot capture it I can get the whole sequence so I know its there. But at a low resolution so that if fits on one screen. If I hit stop on the recording I can play back all the frames but the end of the I2C sequence is never recorded. It's strange because if I use the same setup on another signal (like a clock) it will record all the way until it runs out of memory. Then I can play it back without a problem.Sorry, it's a little hard to explain but I'm hoping this is just operator error someone can tell me what I'm doing wrong or replicate the problem.I have tested this on both the DS1000z and the DS2000a and I'm having the same problem with both.Thanks for any help you can provide, You all are great.
Rigol DS2072 - screen persistence ~4 sec on 20 sec range. - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: August 07, 2017, 01:33:35 pm
content: As the title says, only about 4 seconds persistence when the setting is 20 sec. Actual persistence is shorter on the lower ranges but i didn't check the actual values. Mem depth is set to 14K. Scope has latest firmware and runs fine otherwise. Does anyone else have the same problem?https://youtu.be/uzcYnX_6GiQ

author: pantelei4
author_rank: Regular Contributor
timestamp: August 07, 2017, 02:36:58 pm
content: Quote from: Circlotron on August 07, 2017, 01:33:35 pmYes.

author: TurboTom
author_rank: Super Contributor
timestamp: August 08, 2017, 12:23:35 am
content: My source (unfortunately) doesn't "feature" as much jitter as yours (tried with a delay of 20ms) but I found the same discrepancy between set and actual persitance. So I guess I can confirm your findings on an MSO2072-S ("improved" to 300MHz). Seems to be a bug in the DS2000 F/W. But at least for my applications, that's not a serious one....Cheers, Thomas

author: David Hess
author_rank: Super Contributor
timestamp: August 08, 2017, 04:38:28 pm
content: Apparently it is a common problem for persistence on DSOs to have little to nothing to do with time. They all seem to base persistence on the number of triggers with the time calibration applying only when the holdoff time (time between triggers whether you have a holdoff control or not) is low in comparison.
Keysight 34470A - Input Terminal Dimension - Page 1
Forum section: electronics / testgear

author: onemilimeter
author_rank: Frequent Contributor
timestamp: August 08, 2017, 02:31:25 pm
content: Hi...I'm looking for the input terminal dimension of Keysight 34470A (as shown figure below) but no avail. Is it 19mm x 19mm? Kindly advise.Thanks

author: Alex Nikitin
author_rank: Super Contributor
timestamp: August 08, 2017, 02:37:57 pm
content: Yes.CheersAlex

author: HighVoltage
author_rank: Super Contributor
timestamp: August 08, 2017, 02:52:04 pm
content: To be very exact, they are suppose to be 3/4 of an inch, = 19,05 mmAnd they are the same as in other previous Agilent / Keysight models, so all gadgets will fit.

author: onemilimeter
author_rank: Frequent Contributor
timestamp: August 08, 2017, 03:23:12 pm
content: Thanks Alex and HighVoltage...I wish to buy Fluke 884X-SHORT (as shown in attached figure). I guess the dimension of Fluke 884X-SHORT is also 19.05mm x 19.05mm and will fit the 34470A input terminal well. Please correct me if I'm wrong.Thanks.

author: HighVoltage
author_rank: Super Contributor
timestamp: August 08, 2017, 04:15:40 pm
content: Yes, the Fluke short will fit for the 34470A, I have both.
HP 8591A Option 105 / 85715A  -- looking for manual - Page 1
Forum section: electronics / testgear

author: ps
author_rank: Regular Contributor
timestamp: August 08, 2017, 03:04:22 pm
content: Hello All,does anybody have a manual for Gated Sweep Board (Option 105) for the HP859x spectrum analyzer series? This option adds sweep trigger input and gate outputs. I have checked the regular sources, but without any success.Or does anyone have a manual for the GSM Measurements Personality software (85715A).Thank youPatrick
If you have to pick one between Agilent 34401A vs Fluke 8845A ... - Page 1
Forum section: electronics / testgear

author: BravoV
author_rank: Super Contributor
timestamp: August 06, 2017, 07:00:15 am
content: I've read both specification, both are used condition and both in cal and working fine.Just really like to hear if any other thoughts or comments between these two, like usabilities, features wise that are handy, or even culprits.

author: blacksheeplogic
author_rank: Frequent Contributor
timestamp: August 06, 2017, 08:01:32 am
content: Quote from: BravoV on August 06, 2017, 07:00:15 amI have the 8846A It's a reasonably fast bench meter but lacks expected functionality such as touch hold, choice of thermo-couples, it has very inflexible simple triggering & logging. Not used the 8845A but based on the 8846A I would not look at another Fluke Bench DMM.

author: 2N3055
author_rank: Super Contributor
timestamp: August 06, 2017, 11:27:25 am
content: Fluke 8845 has additional 100uA, 1mA and 10A DC current range... Also better DC current accuracy on some ranges...Also has additional 100uA, 1mA, 10mA, 100mA and 10A AC current range..Both has no temperature or capacity measurement.....Agilent is more popular, and schematics are available..

author: alm
author_rank: Super Contributor
timestamp: August 06, 2017, 12:45:17 pm
content: The HP/Agilent 34401A is a classic and came out in the early nineties. A lot of information is available online, including service documentation. It is a solid performer without major flaws, which explains why it was for sale from the early nineties until the introduction of the 3446x series a couple of years ago.The Fluke 8845A/6A are much more modern, were introduced about ten years ago. Has more features: current ranges, trend plotting, modern connectivity (LAN). One thing to watch out for is that the 2x4 Ohms input connectors can become flaky. There is little to no service documentation available (the user manual refers to a "service guide", but I could find no trace of this document). You should be able to find robrenz's musings about how great the Fluke 8846A is on this forum. The 8845A is very similar to the 8846A (I believe the 8846A adds temperature, capacitance and USB host).If both are working, I would definitely prefer the 8845A to the 34401A for bench use. For systems use I might prefer the 34401A because of reliability and wide support. I would much rather repair a broken 34401A than a broken 8845A, however.

author: 2N3055
author_rank: Super Contributor
timestamp: August 06, 2017, 01:20:18 pm
content: Quote from: alm on August 06, 2017, 12:45:17 pmThis is probably best answer you'll ever get on this question. Really well said... I agree completely.

author: BravoV
author_rank: Super Contributor
timestamp: August 08, 2017, 01:01:56 am
content: Quote from: alm on August 06, 2017, 12:45:17 pmThank you Alm, as I'm expecting, excellent feedback.I guess 8845A it is, as it will be for bench use, thanks again.
Maynuo M9712 - Remote control - Page 1
Forum section: electronics / testgear

author: orion242
author_rank: Unknown
timestamp: August 08, 2017, 12:08:20 am
content: Has anyone here got the remote control working with guy?I have the official rs232 adapter and it works perfectly fine with the supplied software, so I know serial port, cable, and device are good. Looking thru the manual this guy is using modbus, which I'm fairly familiar with. Just testing it out with modscan and trying to read a few registers, I'm not getting any response from the thing. At least nothing that resembles a modbus response. Following the example from the manual reading a holding register, I have modscan sending the exact string (01xh, 03xh, 0bxh, 00xh, 00xh, 02xh, c6xh, 2fxh), nothing back (00xh, 00xh) not even a modbus error response. Switch to the Maynuo software, boom its up and displaying data. Address is 1, set to 9600-8-n-1 in both modscan and Maynuo software. There is a "Connect Mode" that has the options of MAXTIDLEXING or Standard, whatever that is. Neither choice seems to effect anything.Is there some secret knock to get this thing to start talking?Plan B is sniffing out how the Maynuo software works with it. Bit of a PITA, but should get'r'done. Hoping someone here has already crossed this road.

author: orion242
author_rank: Unknown
timestamp: August 08, 2017, 12:35:02 am
content: Do'h...Handshaking was the problem.And in case your wondering the first thing their software does is read 3 holding registers starting with b04xh (Set Mode).
MT48T02 as replacement for DS1742W - Page 1
Forum section: electronics / testgear

author: rfdes
author_rank: Regular Contributor
timestamp: August 07, 2017, 10:59:05 pm
content: The best that I can tell, this should be a drop in replacement for the obsolete DS1742W and was wondering if anyone has had success. The original 1742 was a 150nS part and the MT48T02 is a 70nS part. If anyone has any experience with this substitution I would appreciate your input.ThanksJim

author: rfdes
author_rank: Regular Contributor
timestamp: August 08, 2017, 12:23:16 am
content: Well - I researched my parts and the answer is NO, the 1742W is not compatible with the MT48T02.The 1742W is a 3.3V part and the MT48 part is a 5V part. The 1742(no 'W') is a 5V part. Oh well...Jim