hybridfree/eevblog-posts huggingface dataset:
Agilent u1241B Overload problem - Page 1
Forum section: electronics / testgear

author: romantao
author_rank: Contributor
timestamp: February 25, 2016, 10:32:31 pm
content: Hi everyone,I have an Agilent U1241B hnadhed Multimeter that has 3 years and 1 month (one month after expiring its warranty).As some members reported in the past, it had a random problem at startup where its strangely starts reporting an overload condition. Its a problem also detected in other agilent models.Unfortunately, this Overload seems to be happening very often with my device and its very anoying. In the past I would randomly switch to other modes and then back to Volt and the problem would disapear. So I would like to know if someone can confirm this problem, have possible solutions or my only chance is to cry at keysight :/regards

author: TheSteve
author_rank: Unknown
timestamp: February 25, 2016, 11:30:24 pm
content: I have been told by Keysight they give a 30 day grace extension on warranties. Not sure how universal it is or if it an official policy but it's worth a shot.

author: D3f1ant
author_rank: Frequent Contributor
timestamp: February 29, 2016, 06:53:32 pm
content: In my experience Keysight are great with dealing to intermittent faults. They will probably just replace it, you could have reported it and returned it the first time it happened. High price/quality gear tends to come with high quality customer serviceat least that's what I have experienced.

author: WackyGerman
author_rank: Regular Contributor
timestamp: February 29, 2016, 08:24:01 pm
content: I also have the U1241b but I didn t have that issue yet . But I noticed that the range switch of the meter seems not the best and I heard some people had issues with the range switch . You told that you switched the range switch and then the issue dissapeared so my guess is that it could be a range switch issue also . I would suggest to call to Keysight and tell them the issue . Maybe they will help you accomodating . Just try it and call them up. Good luck
Hantek 6022BL Setup Problems Redux (Everything old is new again!) - Page 1
Forum section: electronics / testgear

author: PP3331
author_rank: Contributor
timestamp: February 27, 2016, 05:36:21 am
content: I can see there's info relating to this scattered all over the place, but much seems conflicting, and I'm hoping to nail this down (once and for all?)I have a new 6022BL unit. It came with a normal USB cable (not the double plug extra power type some folks describe). Setting up with standard Windows 7. I have not used the supplied CD. I downloaded the 6022BL app package which included drivers. Installation of everything seemed OK. The app is version 1.04.When I plugged in the unit for the first time I saw a normal driver install sequence -- it sounded like more than one driver was installed. Button on back of unit is pushed in. Red light is blinking.So far, I haven't been able to see any signal at all on the app. When I try use the load defaults function, the app usually crashes shortly thereafter.Win7 device manager shows the Hantek driver as working -- it shows a single DRIVER 2 entry.I also downloaded the 6022BL standalone driver from the Hantek site and updated the device driver in the usual manner using that driver successfully. No obvious changes -- still blinking red, no signal displayed.Bottom line: I'm not sure what's going on here, and in fact suspect I may be overlooking something obvious.For example:I've seen conflicting descriptions on what the blinking red light means. When should it blink red? When should it blink green? When should I go get a drink?Is there some obvious aspect of the application software setup that I may be missing?What is the correct position for the button on the back of the unit? I have it pressed in. The manual simply says "press in" for Hantek software. From another source I saw a reference that suggested that with the button OUT the logic analyzer side would work with Saleae software. Is this correct?More importantly, how can I determine for sure whether this unit is operational or not, whether I have the drivers installed properly or not, or whether I am using the application correctly for a simple GO/NO GO initial test?Thanks very much!

author: PP3331
author_rank: Contributor
timestamp: February 27, 2016, 09:25:43 pm
content: Got it going. Took some driver manipulations but finally got them loaded correctly. Ya' know, I see folks kinda bitching about this unit, and maybe it's just that I'm old enough to remember what stuff used to cost, but for 80 bucks (this is a BL unit with the logic analyzer function also), this seems (for what it's designed to do) to be a pretty damned nice piece of kit.Thanks again!
CMU200 erratic levels outside 1200-2200 MHz - Page 1
Forum section: electronics / testgear

author: digitalrubbish
author_rank: Newbie
timestamp: February 24, 2016, 12:56:11 pm
content: Dear friendsI acquired a CMU200 for my HAM radio lab. The unit however has an issue. The generator works fine but the spectrum analyser shows about 16 dB too low from 0 till 1200 MHz and above 2200 MHz. Between 1200 and 2200 all is fine.Can anybody give me a hint what component could cause this. I am not afraid of digging into the boards as R&S repair service is way beyond my budget.Thanks for all help and schematics of the input boards or mixer boards where obviously this fault is located.Pedro Wyns ON7WP-AA9HXdirect mail to pedro.wyns@ the famousgmaildot com

author: _Wim_
author_rank: Super Contributor
timestamp: February 24, 2016, 06:21:53 pm
content: Hi,Just send you the service manual. A few questions:- do you have the same results on both inputs?- did you do a factory reset off all settings to be sure no correction table is loaded for the inputs (you can see this under "Connect Control" => "Ext. Att. Input" => "RX Connection Table"

author: digitalrubbish
author_rank: Newbie
timestamp: February 26, 2016, 04:20:31 pm
content: I have this on all 3 inputs.no correction table
HAMEG 103-2 Problem - Page 1
Forum section: electronics / testgear

author: ghostbox
author_rank: Newbie
timestamp: February 25, 2016, 06:49:07 pm
content: Hey guys,I'm fairly new to electronics, so I bought used Hameg 103-2 as my first oscilloscope, and this is what happens when I change Volts/Division (video).Also, when I set to 20V it smells weird, not like burning, but something similar.Does anyone have any idea what could be the problem?Any help would be much appreciated.Thanks in advance!

author: eeadata
author_rank: Contributor
timestamp: February 25, 2016, 07:25:50 pm
content: it seems there is an dirty switch contact. Take it apart and clean contacts. Lube shafts .BTW service it.

author: tautech
author_rank: Super Contributor
timestamp: February 26, 2016, 02:35:27 pm
content: Quote from: eeadata on February 25, 2016, 07:25:50 pm+1Products like Deoxit are normally used to clean the gold contacts in the V/Div selector.Sometimes just "exercise" of the selectors will clean up the contacts.Service manualhttp://elektrotanya.com/hameg_hm103_oscilloscope_um.pdf/download.htmlWait until the "Get Manual" link appears, then click to download.
Schaffner/Tesek: Missing manual for the PNW 2050.8 - Page 1
Forum section: electronics / testgear

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 25, 2016, 03:11:27 pm
content: Does anyone have a pdf copy of the manual for the Schaffner/Tesek: PNW2050.8

author: Mark
author_rank: Frequent Contributor
timestamp: February 25, 2016, 07:22:24 pm
content: Hi Anders,If you contact Teseq directly they should be able to help. Let me know if they don't.

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 25, 2016, 08:12:37 pm
content: I contacted Teseq UK a few hours ago, and they sent me the manual immediately.Excellent service!With the manual I figured out why the user interface behaved as it did.Some options depend on which PNW is used.I did not understand that.My current issue now is to figure out why the open circuit output voltageis half of what is chosen on the user interface.With a load of 2.4K it drops to about half again,and the pulse length shortens, from a previously OK waveform.I get the feeling there might be something wrong with the output stage,like a high output impedance, or a bad capacitor bank switch.A high power device like this should be able to drive most anything and still maintain its output.Or am I making a simple/stupid mistake here?
HP 33120a Software - Page 1
Forum section: electronics / testgear

author: deepskyridge
author_rank: Regular Contributor
timestamp: February 26, 2016, 07:59:26 pm
content: I just picked up a HP 33120a ARB function generator on Ebay with the opt 001 for a great price.What are you using for control via RS-232, ARB generation etc. ?ThanksGary
delete - Page 1
Forum section: electronics / testgear

author: spitfire924
author_rank: Newbie
timestamp: February 27, 2016, 03:28:29 pm
content: -

author: Eheran
author_rank: Regular Contributor
timestamp: February 27, 2016, 11:37:23 pm
content: What happens if simply supply the correct voltage to the scope?Does it run happily?Can u test the battery or know someone who can do that?
Fluke 77 Series II resistance measurement is slow to settle on a value - Page 1
Forum section: electronics / testgear

author: Tallie
author_rank: Regular Contributor
timestamp: February 25, 2016, 03:52:14 am
content: What could cause my Fluke 77 to be slow to settle on an ohms measurement? It's currently connected to a 560 ohm resistor, the reading started at ~630 ohms and has taken about fifteen minutes to creep down, ohm by ohm, to a reading of 575 ohms. I think it has settled on 575 ohms now but it's difficult to tell because when connected, it creeps quickly at first, and then slower and slower. One ohm at a time. It just turned to 574 ohms...

author: retiredcaps
author_rank: Super Contributor
timestamp: February 25, 2016, 04:02:26 am
content: A number of things.1) dirty/contaminated pcb, leads, input jacks, test probes.2) bad input protection components (PTC, MOVs, fusible resistor, spark gap).3) weak, low battery. The Fluke 70 runs an amazing 2000 (two thousand) hours on a 9V battery, but a low or weak battery can cause funny readings.Try a fresh battery first. If that doesn't work, then I suggest a thorough IPA cleaning of all the components listed in #1 and then retest. Let the pcb dry completely by running a fan or letting it dry for 24 hours.For #2, the components are listed in the Fluke user/service manual and you can test all the components in circuit and compare them to the values listed in the manual.
Tektronix TSG4106A RF Signal / Vector Generator Review, Teardown & Experiments - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 23, 2016, 04:33:05 pm
content: You can watch the video here: [53 Minutes]youtu.be/Fp-ZVez08m0More videos at The Signal Path:www.TheSignalPath.com

author: HAL-42b
author_rank: Frequent Contributor
timestamp: February 23, 2016, 10:21:45 pm
content: Cool gear I can never afford.

author: TheSteve
author_rank: Unknown
timestamp: February 23, 2016, 10:28:39 pm
content: Looks more like it's the Stanford Research TSG-4106A

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 24, 2016, 03:11:00 am
content: Quote from: TheSteve on February 23, 2016, 10:28:39 pmI think that it is, the front-panel looks like it is designed by Tek.

author: nowlan
author_rank: Frequent Contributor
timestamp: February 24, 2016, 11:39:29 am
content: Was about to ask if SRS were related to tek/danaher. Doesnt appear to be any releation.Certainly looks similar from back of this unit.Vector Signal Generators, SG390 Series — Up to 6 GHz vector signal generators

author: Lukas
author_rank: Frequent Contributor
timestamp: February 24, 2016, 06:44:26 pm
content: I've taken a look at the firmware upgrade for the TSG4000 series and couldn't find any reference to SRS.As to be expected from Tek, this thing runs linux. Seems like the code name is 'arcteryx'

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 25, 2016, 12:01:32 am
content: Quote from: Lukas on February 24, 2016, 06:44:26 pmInteresting. I hope that they start implementing more features into it.

author: TheSteve
author_rank: Unknown
timestamp: February 25, 2016, 12:05:18 am
content: Perhaps only the hardware was contracted out and Tek is still doing the software in house.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 25, 2016, 12:07:13 am
content: Quote from: TheSteve on February 25, 2016, 12:05:18 amWell the software all runs inside the LCD screen module and that is the component which is different from the SRS model, so it makes sense.

author: Hugoneus
author_rank: Frequent Contributor
timestamp: February 25, 2016, 07:50:37 pm
content: Quote from: HAL-42b on February 23, 2016, 10:21:45 pmI hope that you still found the review helpful.

author: HAL-42b
author_rank: Frequent Contributor
timestamp: February 25, 2016, 07:55:54 pm
content: Quote from: Hugoneus on February 25, 2016, 07:50:37 pmYes it was. I watched it twice and I'll watch it again when I have time, just like the rest of your videos. Thank you.
Gossen/Dranetz Metraclip M312L clamp meter - Page 1
Forum section: electronics / testgear

author: nytefog
author_rank: Newbie
timestamp: February 24, 2016, 08:08:09 am
content: Hello,Are their any reviews on gossen new clamp meter? The Gossen/Dranetz Metraclip M312L clamp meter? I was considering buying the clamp meter and gossen products but wanted to find to find review or first hand experience with it or a si m ilar model in the range. I'm also wanting n to get the metrahit extra or etech. I've gOT an energy and coil dmm and love them. I do love my Flue 87v and 289 a lot also, but do find gossen product accuracy and German quality pits them ahead of the game from my experience with other german madecombustion analysis equipment and amazing hand tools m knipex, nws, wera and wih.Sorry to get off topic but I'm really looking for reviews on the new gossen clamp meters. If any reviews are in the works please let me know. I'm in need of a new clamp meter and want to make a correct choice for an expensive current clamp meter.Any input would be appreciated greatly.THANKS!-Patrick

author: Speeder
author_rank: Newbie
timestamp: February 24, 2016, 06:58:34 pm
content: For sure Gossen Metrawatt make a lot of great test equipment! But this clamp is not made in Germany. I guess you would save some money if you check out the CA units..http://chauvin-arnoux.co.uk/index.php?orderby=product_price&DescOrderBy=DESC&Itemid=33&option=com_virtuemart&page=shop.browse&category_id=69&manufacturer_id=0&keyword=&keyword1=&keyword2=&limit=20&limitstart=0
Help with PCB ELECTRICAL TEST - Page 1
Forum section: electronics / testgear

author: jman
author_rank: Contributor
timestamp: February 23, 2016, 05:54:59 am
content: Hi Everyone,what brand of Test Equipment is good for testing the PCB at High Voltage (Test the Insulation between points)i'm not sure what type of test equipment i need for this. is it HIPOT Testing?Thanks

author: Neilm
author_rank: Super Contributor
timestamp: February 23, 2016, 07:35:03 pm
content: Basic question - what voltage? 100V? 1000V? 10kV

author: jman
author_rank: Contributor
timestamp: February 24, 2016, 09:03:08 am
content: Voltage Range from 0-3KV (Max 5KV)Thanks in advance

author: Rerouter
author_rank: Super Contributor
timestamp: February 24, 2016, 10:03:25 am
content: the most generic item you could find for that, would be a variable output "megger" aka insulation resistance tester,
In general is a Tektronix 2205 oscope worth my time to repair? - Page 1
Forum section: electronics / testgear

author: Planobilly
author_rank: Regular Contributor
timestamp: March 03, 2016, 12:49:22 am
content: Hi guys,I have a new Owan Ds7102V 100mhz digital scope and a Hameg 20mhz HM 203-5. The Hameg is working without issue.A friend gave me a Tektronix 2205-40mhz that is not working correctly and I assume it will not do much the Hameg won't do. I work on audio stuff so I don't need a high end scope in the first place.I have never tried to rebuild a scope so I have no idea of the general cost or how much work is involved. I may just sell it for scrap unless you guys think I should repair it . I don't really need the scope but perhaps I could give it to some kid who would love to have it after it is repaired. The CRT is working but no amplification.Cheers,Billy

author: jwm_
author_rank: Frequent Contributor
timestamp: March 03, 2016, 03:12:21 am
content: That is a fine analog scope. It's certainly worth checking the voltage rails and opening it up to look for anything obvious like a blown cap.

author: vk6zgo
author_rank: Super Contributor
timestamp: March 03, 2016, 03:24:29 am
content: It will probably be easier to fix than some of the Guitar amps you work on.Tektronix certainly don't share the "laid back" attitude to documentation that amp manufacturers seem to display.http://w140.com/tekwiki/wiki/2205

author: Planobilly
author_rank: Regular Contributor
timestamp: March 03, 2016, 04:32:28 am
content: Thanks guysI guess I will take a look under the hood. Who knows, could be something simple.
Data Logging Meter - Page 1
Forum section: electronics / testgear

author: Pack34
author_rank: Frequent Contributor
timestamp: February 22, 2016, 03:37:46 pm
content: It looks like I'm now in the market for some data logging equipment. I'm a big fan of Fluke meters and found a good listing for the Fluke 289 on Ebay. Now, my only concern is the price. The fluke looks like it'll do everything I want, but I'm simply looking for a way to monitor voltage and current levels over extended periods of time (1 to 7 days). Does anyone have another suggestion? It doesn't have to be an actual meter, maybe some simple USB device?http://www.ebay.com/itm/Fluke-289-True-RMS-Data-Logging-Multimeter-/191809783841?hash=item2ca8c10821:g:QlQAAOSwFNZWx3qT

author: dadler
author_rank: Unknown
timestamp: February 23, 2016, 05:50:09 am
content: I have a 287, it cannot log both current and voltage at the same time.Consider the Mooshimeter:https://moosh.im/product/mooshimeter/I have one, and it works well
Rigol DS2072 - different memory depth options Ch1 vs Ch2 - Page 1
Forum section: electronics / testgear

author: Circlotron
author_rank: Super Contributor
timestamp: February 22, 2016, 10:37:56 am
content: Was looking at the scope tonight and I noticed that Ch2 has memory depth options of 14K, 140K, 1.4M etc but CH1 has only 7K, 70K, 700K etc like as if Ch2 was on as well when the mem depth is shared. Is this a bug? I don't think it always did this but not sure. See pics.

author: TomThomas
author_rank: Contributor
timestamp: February 22, 2016, 10:56:52 am
content: Quote from: Circlotron on February 22, 2016, 10:37:56 amHiYour Trigger Setting is the key... You Show CH1 but Trigger on CH2... hence Ch2 Needs resource and you share ADC and MEM between the two channels.Try to set the Trigger on CH1 and you should again see 14k, 140k...Right?Thomas

author: Circlotron
author_rank: Super Contributor
timestamp: February 22, 2016, 11:31:04 am
content: TomThomas you are so right!
Micsig tablet oscilloscope tBook upgrade notification  - Page 1
Forum section: electronics / testgear

author: Micsig_support
author_rank: Regular Contributor
timestamp: February 22, 2016, 06:10:38 am
content: hello customers,if you buy our products from some distributors, and we hope you can see this information. we upgrade tablet oscilloscope tBook recently, pls contact us to get the newest SW. all new function of tBook is free right now.
34401a Measurement setting time - Page 1
Forum section: electronics / testgear

author: thewyliestcoyote
author_rank: Regular Contributor
timestamp: February 20, 2016, 10:59:02 pm
content: Hello,I just purchased 2 34401a. One is a Agilent and the other is a HP with the red and black terminals. The HP one is when measuring systems the measurement seems noisy but settings to a reasonable value. The Agilent one measures the final value right away. Is this common or is there something wrong or out in the HP unit. The resistance measurement is where it is most noticeable.Thanks,Wylie

author: Andy Watson
author_rank: Super Contributor
timestamp: February 20, 2016, 11:16:49 pm
content: Under the Measurement menu A, there is the option to set the resolution. There are permutations of 4, 5, 6 digits with slow or fast measurements. I have read somewhere that one of the differences between the HP and Agilent units is that they default to different "resolutions" when powered-up. I have the Agilent version and it powers-up in "Slow 5 digit" mode.

author: thewyliestcoyote
author_rank: Regular Contributor
timestamp: February 21, 2016, 12:49:04 am
content: Its interesting that they are different but I had set the resolution to 6 digits fast for both of the units. This was one of the first things that I had checked.

author: ManateeMafia
author_rank: Frequent Contributor
timestamp: February 21, 2016, 02:29:16 am
content: The older 34401A have been reported to have front/rear switches going bad. It may not be your problem, but you can check it by shorting the inputs on 2W ohms and set it to the lowest range.Work the switch back and forth to see if it changes.

author: thewyliestcoyote
author_rank: Regular Contributor
timestamp: February 21, 2016, 07:25:31 am
content: ManateeMafia,Thanks for recommendation,I can not seem to find evidence of this failure mode.I would describe the problem like a the charging and discharging of a RC filter with some added noise. For a jumper wire short it starts at 3 ohms and settles to 40 milli-ohms with some noise over the course of 2 to 3 seconds.
Another Fluke 8840 question - Page 1
Forum section: electronics / testgear

author: BoneHead
author_rank: Newbie
timestamp: February 25, 2016, 01:27:00 am
content: Browsed / searched for this but didn't find anything.Have a couple of 884os (plain A & an A/AF) and both respond in the same way described here.When i make a DC voltage measurement, the measured DC voltage is correct; however when the probes are removed from the DC voltage source the readouts (display) don't return to zero or auto-range down they stay up around the max measured DC voltage. i.e. I measure 14.80Vdc form a power supply, display shows 14.7970 Vdc, removed probes from supply, display changes to 14.7955 (approximate) and stays there dropping very very very slowly or almost not at all.Is this normal?Have an 8845 at work and it return to it near zero displayed voltage state when probes removed from source.Wondering about my 8840s.Thanks,Steve, the BoneheadHave an 8845 at work and when v

author: edavid
author_rank: Super Contributor
timestamp: February 25, 2016, 02:12:44 am
content: Quote from: BoneHead on February 25, 2016, 01:27:00 amIt's been asked many, many times, but the question is always worded differently, for example:https://www.eevblog.com/forum/testgear/fluke-8810a-meter-not-rezeroing-after-making-a-reading/msg706371/#msg706371https://www.eevblog.com/forum/testgear/keithley-2015-10v-range-'holds'-previous-dc-voltage-w-leads-disconnected/msg606177/#msg606177https://www.eevblog.com/forum/testgear/keithley-2000-problem/msg732584/#msg732584QuoteCompletely normal.

author: deadlylover
author_rank: Frequent Contributor
timestamp: February 25, 2016, 02:27:12 am
content: Totally normal, it's due to the very high input impedance (>1G Ohm).The 8845 defaults to 10Meg input impedance mode which is why you don't see this effect.

author: BoneHead
author_rank: Newbie
timestamp: February 25, 2016, 03:18:45 am
content: Thanks edavid, & deadlylover, makes perfect sense; hadn't thought about that; and am used to most of the handheld that have 10 meg ohm input. I didn't really think it was a problem as both units pass all power up and self tests.BoneHead
Does this Rigol hack actually work as of 2016? - Page 1
Forum section: electronics / testgear

author: teamSMITHusa
author_rank: Contributor
timestamp: February 20, 2016, 01:10:55 am
content: Does this actually work? Could it be this simple? Just entering my serial number and selecting 'all options', and using the key it generates?Has anyone used this, confirmed, as of this year?http://gotroot.ca/rigol/riglol/Thanks.

author: D3f1ant
author_rank: Frequent Contributor
timestamp: February 20, 2016, 02:16:50 am
content: Yes, but not for all products. You'll have to be specific about which bit gear you are interested in.

author: teamSMITHusa
author_rank: Contributor
timestamp: February 20, 2016, 03:27:11 am
content: Ooops. Sorry...Rigol Oscilloscope DS2072A. Hardware Version 2.0 / Software Version 00.03.01Thanks.
New Fluke 120B Series - Page 1
Forum section: electronics / testgear

author: wptski
author_rank: Newbie
timestamp: February 17, 2016, 02:24:06 pm
content: Just stumbled upon this today and it's brand new with a press release yesterday:http://www.cbs19.tv/story/31229505/fluke-scopemeter-120b-series-simplifies-and-speeds-electro-mechanical-troubleshootingSpecs:http://support.fluke.com/find-sales/Download/Asset/6006986_0000_ENG_B_W.PDF

author: R_G_B_
author_rank: Frequent Contributor
timestamp: February 18, 2016, 01:46:37 pm
content: Flukes response to:http://www.aemc.com/products/html/moreinfo.asp?id=1817&dbname=productsThe new fluke 120b series seems pretty much the same apart from having higher sampling rate a colour screen and a record mode.R_G_B

author: wptski
author_rank: Newbie
timestamp: February 19, 2016, 01:50:39 am
content: Quote from: R_G_B_ on February 18, 2016, 01:46:37 pmThe Fluke 120B Series uses Li-Ion battery packs now and that AEMC unit doesn't.

author: hgjdwx
author_rank: Regular Contributor
timestamp: February 19, 2016, 02:59:29 am
content: Sampling rate, storage depth, waveform update rate, is still garbage

author: wptski
author_rank: Newbie
timestamp: February 19, 2016, 03:28:42 am
content: Well, it's not really a bench scope.
Tektronix 2236 scope - Page 1
Forum section: electronics / testgear

author: Donomite
author_rank: Contributor
timestamp: February 18, 2016, 07:21:17 pm
content: Yesterday i received a free tektronix 2236. It all seems to work but the controls are corroded. It lived its entire life on a oil&gas platform in the gulf of mexico. The knobs and switches move but i get distortion on the display when turning knobs and such. Last night i attempted to remove the guts from the cabinet but the faceplate end appears to be holding it. Ive removed all the hardware needed to remove it but its stuck! There are no catches on the end that i could have missed. Does anyone have any tips on getting this thing out? ThanksSent from my iPhone using Tapatalk

author: Donomite
author_rank: Contributor
timestamp: February 18, 2016, 10:12:22 pm
content: Got it!! Had to use my foot on the rear to push lolSent from my iPhone using Tapatalk
HP 8644 (866x) internal modulation generator jitter, need firmware update?  - Page 1
Forum section: electronics / testgear

author: Juris
author_rank: Newbie
timestamp: February 17, 2016, 03:04:27 am
content: Working with my repaired 8644A (options 002,004,007,010) I noticed quite jitter on generator modulation audio output.If I choose square output there is 600 ns waveform jitter present.When using sine output there isnt any.Same internal modulation generator (NSM OSC) PCB is used in whole 8644/64/65 generators series, can you look at it ?Is it known bug / limitation of internal LF generator ?My suspect is old firmware - 2.10.0 on bay I seen 8644 advertised with 4.2 (?) firmware versions.Can you look what FW version is in your 8644A/B (showing for couple of seconds at startup)?Anybody have firmware files newer than 2.10? more information about firmware versions ? is firmware inter changeable between 8644 and 8664/5 ?Jurisyl3cbp.s.If anybody want to upgrade 8644 to 2GHz option, on bay is available doubler module for 70$, also other modules from 8644...

author: dthung
author_rank: Newbie
timestamp: February 17, 2016, 02:46:47 pm
content: Hi,Do you know the std doubler on bay is compatible with 8644B or not? Thz.

author: Juris
author_rank: Newbie
timestamp: February 18, 2016, 02:11:17 am
content: There isnt any difference between 8644A and 8644B, what I can find, except default configuration - 8644B include option 004 (COAX DSC - low noise) and 007 (NSM OSC - modulation generator) by default.Both use same STD DOUBLER (08644-61040) module for 2GHz range extension.Jurisp.s.what is your 8644 FW version ?

author: dthung
author_rank: Newbie
timestamp: February 18, 2016, 03:11:13 pm
content: Thz for the information. My 8644B can't power up at this moment. I bought it cheap on bay when it was listed as not-working (didn't power up). Now I just need a good weekend to fix it so that it can power up, hopefully.Dick.
ALL-11 adapter schematic for Cypress CY8C25122 micro controller - Page 1
Forum section: electronics / testgear

author: AndersJ
author_rank: Frequent Contributor
timestamp: February 18, 2016, 02:15:59 pm
content: The ALL-11 programmer needs an adapter to program the Cypress CY8C25122 8-pin micro.Does anyone have a schematic diagram or other information so I can build an adapter?
DS1052E hacking to 100Mhz  - Page 1
Forum section: electronics / testgear

author: BenjaminCreator
author_rank: Newbie
timestamp: February 15, 2016, 04:37:47 am
content: Hi Everybody does anyone know if you can still upgrade the DS1052E to a 100Mhz version ?Thanks Benjamin

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 15, 2016, 09:38:12 am
content: Yes.https://www.eevblog.com/forum/blog/changing-the-rigol-ds1052e-to-ds1102e-using-usb-the-dummy-guide/

author: BenjaminCreator
author_rank: Newbie
timestamp: February 16, 2016, 03:13:38 am
content: Thanks crispy tofugood to know it still work's in 2016

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 16, 2016, 10:06:21 pm
content: You're welcome.

author: Jkb242
author_rank: Newbie
timestamp: February 18, 2016, 02:33:44 am
content: Quote from: crispy_tofu on February 16, 2016, 10:06:21 pmI also have the 1052e Rigol with new firmware 4.02 SP1, was your response to Bengamin also apply to this latest release.Much thanks indeed

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 18, 2016, 03:13:37 am
content: Quote from: Jkb242 on February 18, 2016, 02:33:44 amhttps://www.eevblog.com/forum/blog/changing-the-rigol-ds1052e-to-ds1102e-using-usb-the-dummy-guide/It says to downgrade to 02.02 SP2, it's all on the thread.
Noob question regarding which USB Scope/Signal Generator Option to get - Page 1
Forum section: electronics / testgear

author: sfox7076
author_rank: Newbie
timestamp: February 17, 2016, 02:48:57 pm
content: I am considering buying a USB based scope/signal generator to measure vacuum tube audio amplifier/preamplifier projects I am messing around with building. Some that may include winding my own transformers. I have no real use for the scope/generator otherwise (for now anyway). That said, I don't have the room for an older scope and signal generator in my NYC apartment. I thought I had bought a Red Pitaya calibrated kit last week when it was on sale, but they have no record of my order and don't appear to care about my order. I am still open to buying from them, but feel like I have been bait and switched. Before that sale, I was going to buy the Analog Discovery 2. Now I am not sure which to buy or if there is a better solution to my problem.Shawn in NYC.
Suggestions for RS232/4wire 422/485 Afordable handheld decoding with analyzer - Page 1
Forum section: electronics / testgear

author: manzini
author_rank: Regular Contributor
timestamp: February 15, 2016, 09:12:14 pm
content: I'm starting a personal project, a concept test, and I need to go to places where there are computers (mostly industrial or post) connected to devices using RS232 and 4wire 422 or 485 with proprietary (closed) software. As they do me a favor, I can’t disturb due to very small space with a lot of gear.I'm looking for a little sniffer, handheld or USB signal analyzer and more important with real time decoding protocol.I'm a bit lost with the options available (SALEAE and similar), and would like a recommendation for a device, handheld or USB to laptop that does not have problems with balanced 4 wire 422 balanced, 232, 485, nor a solution need to add more gear to drive voltages or wires (like my DS2000) etc.I also don’t know, until I'm in front, if behind a supposedly db9 or rj11/422, RJ45’s there is an excessive voltage or non-expected interface, not well labeled or simply missing information, or unorthodox use of the connectors, for example, an RJ45 carrying USB and 12V or excesive signal voltage swing. (Not interested in USB, only to prevent burn device). A little DMM with decoding ?I have a Rigol DS 2000 but I find excessive in size, don’t need over analog capacity or FFT, and should acquire the decode option (the trial passed) and with only two channels, would have to add hardware to obtain a balanced and bidirectional 422. I prefer to spend on a specific solution even if only for this idea.Something like a DSO Nano form factor or Saleae like with RS422/485 probe & over voltage protection, no crap software or firm, would be my goal.Thanks in advance.

author: uncle_bob
author_rank: Unknown
timestamp: February 15, 2016, 09:26:42 pm
content: HiThe simple answer is that there is no one piece of gear that meets all your requirements.The closest you will get is either a group of devices (all pretty small) or something custom.You have multiple things you are trying to do:1) Deal with a vast number of connectors wired who knows how. 25 pins probably should be on your list. There a a few more RJ's out there than just the RJ-112) Dealing with a bunch of voltages. What if the RJ has POE on it at 48V ... oopss. This does indeed happen.3) Working with a bunch of termination issues. If it's RS-485 how is it biased (or not).Once you have a box with all those connectors on it (and a mux behind each pin) you will need a hand cart to move it around.I'd start off with a couple of adapters, A DVM and a plug panel (jumpers). A $10 DVM is fine. The jumpers from an Arduino kit wold work. Adapt all the weird connectors to one common one. (25 pin maybe). Work out what's what with the DVM. Jumper it where it needs to go.Next grab the right USB dongle and plug that in. Instant decoding, a little work on baud rates. You could also go with a logic analyzer. The decoding will be horrid if you have to look at thousands of lines of communication.I'm sure some of that is off on the wrong track ...Bob
uCurrent Gold meter - basics - Page 1
Forum section: electronics / testgear

author: electronicsfun
author_rank: Newbie
timestamp: February 15, 2016, 02:59:48 am
content: I'm still a newbie at electronics, and I could use some clarification on how to not overload this device.From the PDF for the uCurrent, it saids not to put more current than the range for that current selection, or else you might blow the shunt resistor. This is the top end for each range selection.QuoteLet's say I have a microcontroller that sleeps for 10 seconds, wakes up and lights up LED, and then sleeps for another 10 seconds. I want to measure sleep current. I would keep the selector switch in [uA range] to measure the sleep current consumption. But when the microcontroller wakes up, the wake up activity consumes more current than the 1mA allowed in the [uA range]. Would that blow the shunt resistor? Would I have to move the selector switch from  to  quickly before the microcontroller wakes up? It seems like a pretty risky operation. Wondering if my understanding of overload current is correct, and if there's a better way of making this measurement?Also, if you opt to use 3xAAA, would you solder wires from the AAA battery holder directly to the coin cell contacts? Or is there a better way I'm not seeing?Thank you.Jason

author: michaeliv
author_rank: Frequent Contributor
timestamp: February 15, 2016, 03:34:34 am
content: For the exact scenario you're describing it should be fine. The uA resistor is 10Ohms @ 0.125W so it should be good for up to 110mA on the uA range.Though you will get a rather large voltage drop in your circuit ... so that might reset your micro(unlikely).Also not sure if you might damage the rest of the uCurrent circuit, though at first glance it doesn't look like you would.

author: MLXXXp
author_rank: Frequent Contributor
timestamp: February 15, 2016, 04:27:14 pm
content: I've done some calculations of maximum safe currents. I'm not aware of anyone disputing them.https://www.eevblog.com/forum/crowd-funded-projects/current-gold-on-kickstarter/msg375819/#msg375819Edit:For maximum current if you keep the uCurrent powered up, or add diodes for input protection, see:https://www.eevblog.com/forum/crowd-funded-projects/current-gold-on-kickstarter/msg376311/#msg376311And for my mod that adds the input protection diodes:https://www.eevblog.com/forum/crowd-funded-projects/current-gold-on-kickstarter/msg448208/#msg448208

author: Gyro
author_rank: Super Contributor
timestamp: February 15, 2016, 07:37:36 pm
content: It doesn't have diode clamping as standard?Sounds like something to add immediately on delivery.Edit: I've just searched out the schematic... I'm a bit surprised that it doesn't seem to have any input protection at all, even for the opamp. I'd always assumed it was better than that.The absolute maximum rating on the Max4239 inputs is Vgnd-0.3V to Vcc+0.3V, I suspect that will be damaged before the resistors.
Simpson 265  pictures - Page 1
Forum section: electronics / testgear

author: Excavatoree
author_rank: Frequent Contributor
timestamp: February 13, 2016, 11:59:06 pm
content: I recently purchased a Simpson 265, and thought some may want to see pictures. This is the only Simpson I've see without different positions on the range switch for the differing current ranges; there are multiple jacks for the three current ranges in AC and DC current modes.The interior is similar to the Triplet Dave took apart in EEVBLOG 634, (Analog meter teardown) The newer Simpson Dave had wasn't built as well as this one and the Triplet - I agree with Dave, a real Bobbydazzler.

author: radhaz
author_rank: Regular Contributor
timestamp: February 14, 2016, 12:49:12 am
content: Very cool, thanks for the pics!

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 14, 2016, 02:55:06 am
content: Neat!

author: AF6LJ
author_rank: Unknown
timestamp: February 14, 2016, 02:58:45 am
content: Looks Good...

author: radhaz
author_rank: Regular Contributor
timestamp: February 14, 2016, 04:50:26 am
content: Ive been wondering if it's possible to have a high accuracy digital display connected to the meter movement input, to see how it stacks up against modern gear.
CIE 7905C - Page 1
Forum section: electronics / testgear

author: Vortigern
author_rank: Newbie
timestamp: February 23, 2016, 11:32:34 am
content: Hi there,I've found an old CIE (CHUNG INSTRUMENTS ELECTRONICS) 7905C multimeter, which should be equivalent to many other brand multimeters, like: Knight K-7905, Emmes, Radio App. Fabr. 7905, etc.Unfortunately I have only the bare multimeter: no manuals, no schematics etc.I really would like to find some more documentation about this multimeter and the differences among various issues (A, B, C etc.).I'm also interested in a calibration procedures and schematics about this multimeter, may someone provide them?If needed and helpful, I may provide some detailed pictures of my CIE 7905C.Thanks in advance,Alessio Bolognini
Test-Um Validator batteries - Page 1
Forum section: electronics / testgear

author: ddor847
author_rank: Newbie
timestamp: February 12, 2016, 07:19:23 pm
content: Hi All,Recently had to find replacement batteries my Test-Um NT-9500Validator. Since Test-Um was purchased more than once, getting support and parts has been difficult. So i was quite a bit of luck when I discovered my Nikon camera batteries (model NT-550) work great in the unit. And you can buy them on Amazon for $21.00. That price includes 2 batts and the charger.Dean

author: haveissues
author_rank: Contributor
timestamp: February 12, 2016, 10:35:00 pm
content: Did you mean batteries for a NP-F550 work? That is good to know. I'm thinking of buying a second hand validator since they are pretty inexpensive.
HP 16533 vs 16534 - Page 1
Forum section: electronics / testgear

author: fisafisa
author_rank: Regular Contributor
timestamp: February 11, 2016, 11:03:13 pm
content: HiI have just got hold of two 16533.I inspected the boards and noticed that the PCB is infact of a 16534 and that it was relabelled 16533.I have also noticed 2 resistors that have been changed near the main chip.The two values are 1MOhm and 0.I wonder if this is an attempt to change the card to 16534?Anybody has detailed pictures of the two boards, so that I can compare them?Thanks

author: fisafisa
author_rank: Regular Contributor
timestamp: February 12, 2016, 03:58:42 pm
content: Here are the photos of the cardThe folder:https://www.dropbox.com/sh/2rw2yf4dsdkx0zf/AABbXunP1vkF7xeaC5_B7lmua?dl=0An overview:https://www.dropbox.com/s/ribu2nt1sa8uwrf/16533-A1.jpg?dl=0https://www.dropbox.com/s/2ffdzlhjwwncvgz/16533-A2.jpg?dl=0In the folder above there are zoomed in photos.Also contains pictures of the 16555D card

author: gslick
author_rank: Frequent Contributor
timestamp: February 12, 2016, 05:06:44 pm
content: Here are some photos of a 16534A that I had. I sold this one to a friend recently. I still have a couple more left.https://goo.gl/photos/n157WK1RqNCaWycN6

author: fisafisa
author_rank: Regular Contributor
timestamp: February 12, 2016, 08:03:02 pm
content: ThanksThe resistors are swapped compared to 16534Everithing else seems to be exactly the same.....So I guess the previous owner tried to convert a 16533 into 16534 by swapping resistor and mimic the 16534.Simething must not have worked as it left the resistors in a configuration different from 16534.Now I need a picure of a 16533 unmodified to confirm my guess.I also guess that the 16533 and 16534 differ in the main FPGA programming....Cheers
USB powered Fluke 123  - Page 1
Forum section: electronics / testgear

author: TTLLOGIC
author_rank: Newbie
timestamp: February 08, 2016, 05:35:15 am
content: I decided to ditch the internal 3000mAh NiMH battery pack in favor of a 10400mAh Li-Po USB battery pack. Please share your thoughts, I certainly enjoy the increased run time and ability to recharge from USB instead of having to use the bulky Fluke power adapter.

author: crispy_tofu
author_rank: Super Contributor
timestamp: February 08, 2016, 08:09:37 am
content: That is very cool.

author: quarks
author_rank: Frequent Contributor
timestamp: February 09, 2016, 08:35:47 am
content: Thats a very good idea.Thanks for sharing.

author: mariush
author_rank: Super Contributor
timestamp: February 09, 2016, 09:34:04 am
content: It's a cool idea.Just make sure you're not making measurements while the meter is connected to your PC's usb.Make sure the charger is fully isolated.

author: Jacek_Paw
author_rank: Contributor
timestamp: February 09, 2016, 10:38:16 am
content: I'm affraid that you have violated the isolation of the meter. I'm not sure how this unit is build but bare usb ground connector doesn't look safe in this solution.

author: TTLLOGIC
author_rank: Newbie
timestamp: February 12, 2016, 04:33:29 am
content: Quote from: Jacek_Paw on February 09, 2016, 10:38:16 amThe shield of the USB connector is not connected. For my application, test and measurement on battery powered material handling equipment (i.e. forklifts); I am not concerned about isolation. Of course anyone who would perform this modification should understand the inherent risks if measurements on live mains circuits were going to be performed. In my case I do not do service work on mains connected equipment, the very minimal risk is far outweighed by the benefits gained.Quote from: mariush on February 09, 2016, 09:34:04 amThank You, the point of this modification was to not have to connect a charger to the meter during extended use.
Rigol DG4000 series, or others? - Page 1
Forum section: electronics / testgear

author: neslekkim
author_rank: Super Contributor
timestamp: February 05, 2016, 11:59:06 am
content: Since there are campaigns on the dg4102 and dg4162 i was thinking about getting one of these, but are there other wavegens that is in the same pricerange/better performance like these?And are these equally usable in the whole frequencyrange?, low frequencies, audio range etc as the higher frequencies?

author: neslekkim
author_rank: Super Contributor
timestamp: February 11, 2016, 02:11:14 pm
content: Also found Siglent SDG5162 and SDG2122X which seems to be in the same price range as the Rigol, but is Siglent an good product in this area?Also seems that the cheaper SDG2000x series have some better specs, 16bit resolution, and 1.2GSa/s samplingrate compared to SDG5000 and DG4000 which are 14bit and 500MSa/s samplingrate...Nobody with experience with these?, or did I miss an thread that discuss these?

author: Macman
author_rank: Regular Contributor
timestamp: February 11, 2016, 02:58:19 pm
content: If you need the higher frequencies or more advanced modulation modes I would say go with the Rigol DG4000, if you need value I would go with the SDG2042X.I have the Siglent SDG2042X. Although the headline spec is 1.2 GSa/s this is interpolated. In DDS mode it is 300 MSa/s and true arb mode is 75 MSa/s. The Rigol has a better selection of modulation options and the other waveforms such as square and ramp go to higher frequencies. For instance the ramp waveform only goes up to 1MHZ on the Siglent. The harmonic support on the Rigol is also better, the Siglent only allows addition of second and third harmonics.I wouldn't bother with the SDG5162 I think that has it's own issues.Dave did a video a short while ago where he compares the Rigol DG4000 with the SDG2000X. There is also a recent thread on the SDG2042X.

author: neslekkim
author_rank: Super Contributor
timestamp: February 11, 2016, 03:07:48 pm
content: Ah, thanks!, i was wondering if there was videos on it, found it now:I know all to little about these things, but due to the rigol campaign the price on the dg4102 and dg4162 is kinda affordable, i know it's probably a bit on the high side for hobby, and usage, but don't want to buy something too cheap that is useless.I have the rigol ds2202a-s, but I find the signalgen too cumbersome to use.

author: Macman
author_rank: Regular Contributor
timestamp: February 11, 2016, 03:40:12 pm
content: Just be aware that in that video he was on an early version of the SDG2000X firmware and it has been improved since. There is now limited support for harmonics, many more arb waveforms and quite a few bug fixes.

author: CustomEngineerer
author_rank: Frequent Contributor
timestamp: February 12, 2016, 04:25:12 am
content: Quote from: neslekkim on February 11, 2016, 03:07:48 pmI made the same mistake and bought the DS2072A-S. I finally got tired of messing with the builtin generator and bought the Siglent SDG2042X. So much easier and less painful to use.
GDS-2072E 1Mpoints FFT -> I'm impressed. - Page 1
Forum section: electronics / testgear

author: markone
author_rank: Frequent Contributor
timestamp: February 13, 2016, 01:05:35 am
content: I tinkered a bit around mine GDS-2072E's internal FFT function and i have to say i'm seriously impressed with the results, considered the instrument's cost.The spectrum trace update rate at 1Mpoints FFT is around one per second, similar to what i get with the DS1054Z in memory mode FFT of course with waaay less points, but the rest of UI is managed a lot faster, ie cursor's position controls are very fluid, sign that we actually have multi threaded code execution spreaded on dual Zynq's cores.The FFT function UI control is not optimal but way better than Rigol, i'm getting used anyway; adding this to the overall massive performance gap renders the FFT DS1000Z spectrum less than a toy in comparison .In attachment some spectrum screens taken with 0dBm/50ohm sine carriers of 1Mhz, 28Mhz and 40Mhz and some fine AM/FM modulations applied (50hz, 1Khz, 5Khz ), 1Mpoints setting.The channel vertical setting is not optimized, the signal amplitude is always under 1/3 of the full vertical scale, so better S/N are actually achievable.Carrier and modulation settings are described in filenames.