hybridfree/eevblog-posts huggingface dataset:
Heath Schlumberger SP-2717 Power Supply--Any Good? - Page 1
Forum section: electronics / testgear

author: Dumpsterholic
author_rank: Regular Contributor
timestamp: December 14, 2022, 08:04:30 pm
content: Hi all:Just brought home a "Regulated H.V. Power Supply" that I found on Craigslist for $100. I brought along my DMM and tested the B+ HV supply, which delivered around 404 VDC. I didn't bother to test the other outputs, since they are redundant to my needs.A quick search of the Eevblog forum yielded this thread, which got me a little nervous:https://www.eevblog.com/forum/testgear/do-you-have-any-test-equipment-in-your-lab-that-uses-vacuum-tubes/msg2676798/#msg2676798In that thread, user Martin.M pointed out a potential pitfall, stating:"Set it to 12 Volts or 15 Volts to feed any small transistor experiment,Then press STANDBY and look what the voltage output will do before shutting down finally.. (a typical 30V Transistor will be RIP )Heathkit made a bullshit there, it may be better to remove "Standby" and type there "WORST CASE SWITCH""I'm guessing that he refers here to some kind of voltage spike which will result from switching either the HV B+ 0-400V supply or the C- 0-100V supply from the "On" position to the "Standby" position while the DUT is still attached to the output terminals?My question is, couldn't a person simply disconnect their DUT before switching from "On" to "Standby" to avert this problem, or is there another aspect to this potential pitfall which I'll need to look into before I start testing and using the new power supply?BTW: the photo posted in that original thread depicts a device which appears identical to the one I have, except mine is labeled not "Heath/Zenith" but "Heath/Schlumberger".Thanks for reading. Any comments, jokes, suggestions or criticisms will be greatly appreciated.
Keysight DSO/MSO 5000/6000 encoder replacment? - Page 1
Forum section: electronics / testgear

author: jayk
author_rank: Regular Contributor
timestamp: December 18, 2022, 08:21:09 am
content: I have a DSO6034A and the timebase encoder it starting to flake out. Anyone know a source for a replacement part? I emailed Keysight and they said the scope is no longer supported and could not give me a p/n for the encoder.

author: HighVoltage
author_rank: Super Contributor
timestamp: December 18, 2022, 08:30:09 am
content: I have not taken a 6000 model apart but most likely it is a standard encoder, that Agilent / Keysight have been using for many years on many models. You can get this at mouser or digikey.

author: jayk
author_rank: Regular Contributor
timestamp: December 18, 2022, 07:26:57 pm
content: Do you have a p/n?

author: coromonadalix
author_rank: Super Contributor
timestamp: December 18, 2022, 07:32:25 pm
content: The best prsctice would be to dismantle your scope and check the brand and part number if any written on them, to be sure you wil get the right model
Choosing bandwidth on an oscilloscope current probe - Page 1
Forum section: electronics / testgear

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: December 12, 2022, 06:57:38 pm
content: I am about to purchase a Micsig 2100A or B.I already have a Rigol MSO5000 series 'scope and the rather good Micsig DP-750 diff probe.My intended purpose is primarily power quality analysis - AC 50Hz driven SMPS and other PSUs, with secondary analysis of valve amplifier and test equipment.What I'm not sure enough about is what bandwidth I actually need i.e. the A or B version, and would appreciate some sage advice. To some extent the seeming over-performance of the A has thrown a spanner into the works.I CAN run to the B version so if it ends up as A OK but B more desirable then I'm OK with that.Thank you.

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: December 13, 2022, 04:37:40 pm
content: No-one, really?

author: Martin72
author_rank: Super Contributor
timestamp: December 13, 2022, 09:12:52 pm
content: Hi,You know "my" thread about the micsig currentprobe ?https://www.eevblog.com/forum/testgear/micsig-current-probe-cp2100b-tests-and-comparing/msg3072460/#msg3072460The 800khz version could be enough for your purposes but be aware that the clamp is not the smallest on the market.When using power analyzis on the rigol, don´t forget the channel deskew between voltage and current probe.

author: Fungus
author_rank: Super Contributor
timestamp: December 13, 2022, 09:14:53 pm
content: A is OK and will do what you want but B is obviously more desirable.

author: Hydron
author_rank: Super Contributor
timestamp: December 14, 2022, 04:37:47 am
content: The "800kHz" one I got for work seemed to have a -3dB point of >2.5MHz, so not really sure how they decide what differentiates the A and B versions. Maybe I just got lucky? Or maybe there is something more subtle they use to pick the best ones to sell as the higher BW model?

author: 6SN7WGTB
author_rank: Regular Contributor
timestamp: December 14, 2022, 07:32:44 am
content: Quote from: Martin72 on December 13, 2022, 09:12:52 pmYes Martin, a really good thread and without it I probably would not have spotted the need to deskew.It did seem the B may just be a 'selected' version although thought I saw that it has one additional component on the main PCB.Putting the question a different way, what sort of tasks would I NOT be able to do with a B vs. an A?

author: Martin72
author_rank: Super Contributor
timestamp: December 14, 2022, 10:40:29 pm
content: Hi,Good question..For correct amplitude measure the signal´s frequency should be under the bandwith of the clamp.For correct displaying the waveform (square) you got more "reserves", otherwise the signal looks like the pic below.(measured with a clamp which bandwith is 120khz).What else....Actually I don´t know, maybe other do.
Erroneus trace on my HP 3585A Spectrum Analyser - Page 1
Forum section: electronics / testgear

author: John_Sinha
author_rank: Newbie
timestamp: December 14, 2022, 04:07:52 pm
content: I recently purchased this old spectrum analyser off eBay for a few quid. What is causing this erroneous trace. I have nothing connected to the input of this spectrum analyser. Any idea why the response is not flat at the low end (under 900Hz)?

author: jonpaul
author_rank: Super Contributor
timestamp: December 14, 2022, 04:32:39 pm
content: normal, no problem!Baseline displays noise floor, see specifications.Large peak at left is mixed 0 Hz, every Analyzer has similarread up on sweep mixer lo type RF Analyzer theory, many HP applications notesget manualj

author: 807
author_rank: Frequent Contributor
timestamp: December 14, 2022, 06:11:31 pm
content: Yep. It's called the "zero response". Just a 0Hz marker aligned with the left hand side of screen. It's mentioned on page 3.2.1 & a few other times in the manual.https://pearl-hifi.com/06_Lit_Archive/15_Mfrs_Publications/20_HP_Agilent/01_HP_3585A-B_40MHZ_SpecAn/HP_3585A_Operating.pdf
Agilent/Keysight 9000 series bandwidth upgrades  - Page 1
Forum section: electronics / testgear

author: darkstar49
author_rank: Frequent Contributor
timestamp: December 13, 2022, 08:31:05 pm
content: I’m trying to find out whether the bandwidth upgrades on the Agilent/Keysight DSO/MSO9000 require servicing or if these are ‘field-installable’ (i.e. by key)Some docs mention that returning it to a Keysight service center is mandatory, but I’d like to know whether that’s in fact for the calibration only, or if this is ‘really’ required for the bandwidth upgrade as well ? In other words, is anything achievable by option key only (although without the proper calibration/adjustment tables) ?Any pointers/feedback welcome !
Most economic USB-C PD test equipment? - Page 1
Forum section: electronics / testgear

author: nctnico
author_rank: Super Contributor
timestamp: December 12, 2022, 08:31:04 pm
content: I'm looking at a project that involved USB-C PD at both host & device side. It looks like it is a good idea to get some test equipment that can mimic various chargers and devices. So far I have found these two units:Acroname 'USB-C Hub with Power Delivery Analyzer':https://acroname.com/store/programmable-industrial-power-delivery-hub-s99-usbhub-3c-pro?sku=S99-USBHUB-3C-PROIt looks like it can do the business but it has many more features than I need. With the options I would need, it ends up costing ballpark $2kPassmark 'USB Power Delivery Tester'This is a device (load) only and priced somewhat nicer at $750 but only does half of what I need.However, both products don't really fit the bill and look fiddly to setup. Are there any other options out there? Maybe some USB-PD demo board I have overlooked? Ultimately my goal is to be have some confidence that the product I might design 1) works well and 2) has a good chance of passing USB-C PD qualitication testing.

author: ogden
author_rank: Super Contributor
timestamp: December 12, 2022, 09:06:28 pm
content: Google for FNIRSI-C1, preferably on aliexpress. It may provide more functions for MUCH lower price.

author: nctnico
author_rank: Super Contributor
timestamp: December 13, 2022, 08:00:08 am
content: Quote from: ogden on December 12, 2022, 09:06:28 pmInteresting; I have to see what it can do in terms of simulating a host & device where it comes to power delivery.
WAVETEK 27XT multimeter - Page 1
Forum section: electronics / testgear

author: Mcircuits
author_rank: Newbie
timestamp: December 12, 2022, 11:55:37 pm
content: Does anyone here has the Wavetek 27XT? Long time ago it was working well until a co office worker uses it and probably put on the wrong probe slot then uses it to test AC voltage. When he returned it, the Capacitance and Inductance went berserk.

author: bc888
author_rank: Regular Contributor
timestamp: December 13, 2022, 03:46:10 am
content: I do not. However, there is a You tube vid of someone who over currented theirs and they show what happened. Assuming you checked the fuse, this one said the fuse was fine and it blew a trace. Easy fix. Worth watching if nothing else so you are watching out for the balls to fall.The manual appears to have a maintenance and repair section. ( I didn't download it) here:https://www.opweb.de/english/company/Wavetek/27XTGOOD LUCK! Hope your issue is so easy. Let us know how it goes.
Fluke  287  or  289  conditions inside - Page 1
Forum section: electronics / testgear

author: Jon.C
author_rank: Unknown
timestamp: December 11, 2022, 07:09:26 am
content: Hi guyswhat do you preferFluke 287 completely new made in the USA, manufactured in February 2022 for €440orFluke 289 manufactured in 2011 very little use (some small dirty stain) made in the USA manufactured in 2011 for €440for 100% electronic bench workI already have 1 177 and 1 87VThank you so much

author: J-R
author_rank: Super Contributor
timestamp: December 11, 2022, 08:58:55 am
content: My vote is the 287. No supercap to worry about, will have a fresh calibration and of course is new.Now what about the extra features with the 289? Well, your 87V has the 1kHz filter, but the LoZ and 50 Ohm range could be handy in rare cases. Personally I would use a 4-wire setup for low resistance measurements and LoZ can be handled easily enough with a simple resistor.You said 100% electronics bench work, so the obvious question is why not a bench meter?

author: Jon.C
author_rank: Unknown
timestamp: December 11, 2022, 09:56:31 am
content: thanks for your answerI had 2 bench multimeters and I sold them, too much space, I have kept a fun OWON XDM1041 that I am happy with.I have a strange "attraction" for handheld multimeters and not for bench onesThe more I think about it, I think that 287 also convinces me...ummmh

author: BeBuLamar
author_rank: Super Contributor
timestamp: December 11, 2022, 12:30:30 pm
content: I have both of them. The 289 was made in 2016 and the 287 in 2022. Both are rarely used so cosmetically not different. I have them both so no decision but I think I would keep the 289 if I have to let 1 go.

author: J-R
author_rank: Super Contributor
timestamp: December 12, 2022, 01:38:22 am
content: With bench use in mind, will either come with calibration data? When I purchased my new 287, it came with a verification report from Fluke, which is a great credibility booster.

author: Arhigos
author_rank: Regular Contributor
timestamp: December 12, 2022, 03:36:53 pm
content: If you do 100% electronic bench work you probably will never need low-impedance and low-ohms functions. (both functions on this meter is for troubleshooting industrial electric motors)
Fan Air Flow Direction in Agilent 54845b Scope Power Supply - Page 1
Forum section: electronics / testgear

author: DrNefario
author_rank: Contributor
timestamp: December 12, 2022, 02:02:18 pm
content: I have completed a repair on an Agilent 54845B, and before I put all the covers back on, I noticed something that seems counter intuitive.Per the picture, all 6 of the fans on the left side of the unit blow into the scope so that the air flow is left to right as viewed from the front of the scope.However, there is a small fan at the power supply end that is just in back of the display. I tested this and am sure it is blowing right to left. This is against what the upper front left fan is doing.Can someone confirm this is wrong? The air intake to the power supply in my case is at the front right side of the scope which is drawing air into that spot. I did a test with a smoking match to be sure.I'm thinking that I need to reverse the fan at the power supply. Comments?
HP 11710A Teardown - Page 1
Forum section: electronics / testgear

author: amc184
author_rank: Regular Contributor
timestamp: December 10, 2022, 11:45:46 pm
content: I picked up an HP 11710A recently to use as a case for a project I'm working on. I've done this a few times before, as I think buying up an older, fairly obsolete piece of test equipment is a way to get a good enclosure and reuse something which otherwise is not that useful any more.There's very little information on the 11710A, so I thought I'd post a teardown as I get the enclosure ready for its new life. Feel free to PM me if any of the internal parts you see would be useful. The 11710A uses the same style of case as most HP test equipment of this era, I think they called this System 1.The white and red squares were added by the previous owner, which looks like it was the Radio Centre of the NZ Navy. Considering its age (build date of around 1978) it's in great shape.Like most system 1 cases the top, bottom and sides are simply removed, leaving the cast aluminium side panels with the front panel, rear panel and support panel sandwiched in between.The unit is made up of a few main parts:A linear, regulated power supply, starting with an IEC C14 inlet / voltage selector / fuse / line filter assembly, then a transformer, then a regulator PCB with external pass transistor and smoothing capacitor.A signal path, with N-type input and output connectors and hardline coax between these connector and a pair of RF relays. The relays seem to be set up so that the signal could either be routed to the downconverter PCB or bypass the unit without modification.A downconverter PCB. My understanding is that this mixes the incoming RF with a local oscillator to produce an IF output. I'm not an RF guy.The power supply regulator PCB and downconverter PCB are shown below:

author: Robert763
author_rank: Super Contributor
timestamp: December 11, 2022, 02:05:18 pm
content: While I also repurpose Sysem cases I would not break that unit.The 11710A is an add-on for the 8640A/B to extend the frequency range to below 500 kHz i.e. VLF.It is still a usable bit of kit and will of course work with any RF generator that covers 5 MHz.

author: factory
author_rank: Super Contributor
timestamp: December 11, 2022, 07:06:22 pm
content: Please don't scrap that for the case, I'm looking for one to go with my 8640B, find something more common & actually useless to use for a case, such as a 435 power meter (useless without the often destroyed sensor).David
Wiltron 6600A series sweep generator - late(?) version CPU daughterboard/1 EPROM - Page 1
Forum section: electronics / testgear

author: wb0gaz
author_rank: Frequent Contributor
timestamp: December 15, 2022, 01:59:30 am
content: Digging into a Wiltron 6653A sweep generator today, discovered the CPU/EPROM/RAM board (behind the front panel) has a plug-in daugherboard (plugs in where the 8085 CPU would normally go) with a CPU (8085), an address latch, and a single 28-pin EPROM (part number TBD, covered by label.) None of the service manuals I've surveyed document this module (otherwise, the sweepers have five 24-pin EPROMs on a board behind the front panel,a long with CPU and RAM.)The daughterboard has part number 6600A-D-34053 REV A.Attached is a photo of the daughterboard.If you recognize this version of the Wiltron 6600A series sweep generator, would you let me know?Thanks very much,Dave
Advantest Service Manuals and Service Password? - Page 1
Forum section: electronics / testgear

author: jschatzman
author_rank: Newbie
timestamp: February 04, 2017, 03:53:31 pm
content: I have been trying to locate a service manual for the Advantest R3477. Advantest responded to my query "Advantest no longer sells or supports spectrum analyzers. Contact Microlease for service manuals". Microlease told me that they ae forbidden by their contract with Advantest to sell service manuals. That seems like a catch-22. When I relayed the information from Advantest to Microlease they then told me that they do not have the service manual, but would have to get it from Advantest. I am still waiting to hear more.I have to believe that Advantest did print an English language service manual. But where can one obtain a copy??Also, anyone know the service password for the R3477?

author: chick0n
author_rank: Regular Contributor
timestamp: December 08, 2022, 12:31:10 pm
content: Sorry for grave digging...But this is maybe interesting:"Advantest Measuring Instruments repair/calibration support havetransferred to third party company "Three-R Corporation (in Japan)"since April-2017 so we will reply you on behalf of Advantest."http://www.three-re.co.jp/english_top.htmlAnd of course:"In any case, we do not provide maintenance manuals, circuit diagrams,instruments internal technical information and any other sensitivetechnical information to customers."So they have the stuff we want.
RIGOL MSO5000 Parallel Decode issues - Page 1
Forum section: electronics / testgear

author: JetForMe
author_rank: Contributor
timestamp: December 08, 2022, 12:15:04 am
content: I recently got a Rigol MSO5074 and did all the hacks to fully upgrade it. So far so good.Last night I was working on troubleshooting a serial-to-parallel shift register circuit, and used the scopes D8-D15 channels to view the shifted data. The output is a simple 8-bit value that increments by one each iteration. The data line traces show the correct value, but the decoder sets every other MSB bit high. I have the decoder configured to decode on the falling edge of RCKHere’s a wider view (annoyingly, if you zoom in too far, the Rigol won’t show the decoded values) for context:(Huh, i can't figure out how to get an inline thumbnail for the attached images. Image "12.png")Here it is zoomed in. The bitstream shown is 0b01010011, as shown by the AX cursor value in the lower-right. But the decoded value (as seen on the zoomed-out view above) is 0xD3.(Image "13.png")As far as I can tell, this is just a bug in the Rigol, but perhaps there’s something else going on with the signaling that I'm misunderstanding?Also, you can configure "Bit X" and "CH" when setting up the Decoder, but the manual doesn’t explain what those are. Does anyone know?

author: thm_w
author_rank: Super Contributor
timestamp: December 08, 2022, 01:18:20 am
content: Yeah don't worry about the inline, its a bug, you can fix it if you really want but I don't think its needed:https://www.eevblog.com/forum/blog/inserting-attached-images-inline/msg3692618/BITX and CH are described in the users guide:https://www.batterfly.com/PDF/RIGOL/mso5000/MSO5000_UserGuide_EN.pdfif you want to trigger off a specific bit.Did you zoom in more to see if there are no glitches when RCK falling edge occurs? Maybe check that channel with an analog channel measurement as well, to make sure its not doing anything weird.I would also consider buying a $10 saleaea clone, if you prefer debugging on the PC.
(UK) - Can anyone spare some 'scope probes - even basic ones? - Page 1
Forum section: electronics / testgear

author: eti
author_rank: Super Contributor
timestamp: December 08, 2022, 04:45:15 am
content: Hi everyone.I was evicted back in July (horrible experience, lots of back story, but no sob story) - I've managed to just about get my mental health back to almost normal. In the process, my equipment has been shipped off into storage units somewhere (I do not drive, have no income - govt being an absolute NIGHTMARE what with my inability to travel, and them unwilling to SANELY process my claim for UK "Universal Credit"), so I am here with my parents right now, have been since July, zero income, and a few boxes of my bits and bobs.Long story short, I have managed to find my JYETech scopes - "DSO Shell" and "DSO112a", but neither have probes with them (they are in storage - and inaccessible for now).I am trying to keep my mind occupied, mental health has suffered a lot. My appeal is this - can anyone spare some basic 1x/10x scope probes (BNC ends) and maybe post them to me, within the UK? I am not one to ask such things usually, but I am the kind of chap who likes to help others, and would gladly do the same if someone else was in this situation.No pressure, no guilt, but I have no income - LITERALLY none - and no way to pay you. If you are willing to do this, I would be most grateful indeed to you, but if not, no worries.Take it easy have a lovely day.Matthew.

author: ADT123
author_rank: Regular Contributor
timestamp: December 08, 2022, 07:30:02 am
content: Assume you just need 2 probes (x1,x10)? Send me a private message with your address and consider it sorted.

author: eti
author_rank: Super Contributor
timestamp: December 08, 2022, 08:20:15 am
content: Quote from: ADT123 on December 08, 2022, 07:30:02 amThanks ever so! Have PMd you
LCR Meter for In-Circuit Testing - Page 1
Forum section: electronics / testgear

author: mapleLC
author_rank: Frequent Contributor
timestamp: June 01, 2022, 05:35:03 am
content: I was wondering what the characteristic/feature of this meter is called that allows for in-circuit testing as you see here in this video:https://youtu.be/mxz3-fGs1Lk?t=1160My impression was that you had to pull caps to test them, so I would like to be able to repeat this with a bench meter.

author: Kleinstein
author_rank: Super Contributor
timestamp: June 01, 2022, 07:23:49 am
content: A in circuit test is not 100% reliable, and it depends on the circuit. The relatively large electrolytics at the supplies are usually OK to test unless there are several in parallel. A common and relatively reliable in circuit test is to check the ESR of large electrolytics - when showing to high an ESR the capacitor is usually bad. However there is a chance to have a parallel capacitor that is not obvious and may result on low ESR even if the capacitor one thinks to check is bad. In theory an inductor can cause a resonance and this way get a wrong result, but this is rare.There is always a chance to have a parallel path and thus read a higher capacitance than the part one is measuring at. So to low a capacitance reading is usually a sign of a bad part.Ideally an in circuit test would run with different frequencies and check for a consistant result. This way one could detect things like a resonance.As a common failure mode, that is reasonable measurable in circuit is high ESR, it would make sense to have a meter that also shows ESR.For in circuit tests it helps if the test runs with a relatively small voltage, like < 400 mV peak. This way diodes and similar junctions are usually off and there is little chance to damage the circuit. A test with higher voltage is more likely to get effected from other circuit parts.The low test voltage would be the main point on how well a meter is suitable for in circuit measurements.Having a somewhat higher test frequency (e.g. >= 10 kHz) also helps as this reduces the effect of parallel resistive paths.

author: coromonadalix
author_rank: Super Contributor
timestamp: June 01, 2022, 10:55:36 am
content: +1Some tests who are done with an meter may not be good at all, an good lcr meter will have an serial and or an parallel mode to test ''in circuit'' capacitor or inductances, sure it can measure an resistor tooit can help pinpoint a few things BUT for better results, you alway have to remove the part from the board, many things can affect the ''read'' valuesEX: working in smps psu's, they are design to work with frequencies, not in pure DC / linear mode, sometimes you tests a few things and they appear as shorts, but when under a normal functionning mode they are okay ....Same for other electronic equipment, it can vary a lot

author: ve7vie
author_rank: Contributor
timestamp: December 07, 2022, 10:49:24 pm
content: MrCarlson likes his Circuit-test for that:https://www.eevblog.com/forum/testgear/lcr-meter-for-in-circuit-testing/Circuit-test still has a similar model......https://www.circuittest.com/dlm-260-digital-lcr-meter.html
Omicron Lab B-AMP 12 Power Amplifier - Page 1
Forum section: electronics / testgear

author: trinacria
author_rank: Contributor
timestamp: December 07, 2022, 01:58:09 am
content: https://www.omicron-lab.com/products/vector-network-analysis/accessories/b-amp-12-amplifierI'm looking for something like the Omicron Lab B-AMP 12 Power Amplifier, but less expensive and with reduced specs. I only need 1 Hz to 20 MHz, while the B-AMP 12 is DC to 50 MHz. Also voltage can be lower, and the gain can roll off in the higher frequencies.Basically what I want to do is amplify my AWG, and then script the AWG and oscilloscope to make a frequency-response analyzer. It's for hobby use, otherwise I'd shell out for a real FRA.I've searched quite a bit, but it seems pretty difficult to search with Google or on the various marketplaces. I keep finding either audio amps without high frequency, or RF amps without low frequency. Browsing test equipment sites hasn't turned up anything comparable, either. The closest I've seen is a demo board for a variable gain amplifier, but the specs were too low.Does anyone know of a similar alternative?Or how to find something like this? Thanks in advance.
LD400P electronic load - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: December 06, 2022, 07:40:55 pm
content: Hi,Does any body have a quik start guide or vid for this?We searched but manual not that readable.Just want to set basic constant resistance.And make sure power limit is above 120W

author: thm_w
author_rank: Super Contributor
timestamp: December 06, 2022, 10:53:18 pm
content: https://resources.aimtti.com/manuals/LD400+LD400P_Instruction_Manual-Iss4.pdfManual seems fairly readable to me. Has A and B level modes, and an enable.From the main screen:- Press the Mode softbutton, then select "CR" constant resistance.- Press the Levels softbutton, set levels, or none to disable.
Elgar sw1850 power supply - Page 1
Forum section: electronics / testgear

author: Faringdon
author_rank: Super Contributor
timestamp: December 10, 2022, 03:49:11 pm
content: Hi,Just been kicked out of the lab as closed for the night.Failed to get the Elgar sw1850 power supply working.....needed it to test a 115vac 500w smps.Do you know why it might have kept tripping out whenever i tried to enable it?....it gave some "limit" type error.Is there some signal input you have to give to get this thing working.A engineer was using it last week, but that guy was off today.Elgae sw1850 1850 va power supplyhttp://www.signaltestinc.com/v/vspfiles/assets/datasheet/Elgar_SW_Datasheet.pdf
HP 4141 manuals - Page 1
Forum section: electronics / testgear

author: chilternview
author_rank: Frequent Contributor
timestamp: December 06, 2022, 06:05:52 pm
content: Picked up a HP 4141 today that was going cheap on eBay. For those that have never heard of it, it has 4 SMUs to force/measure current and voltage, plus 2 voltage sources and 2 voltage measurement units. It's in pristine condition and powers on and passes self test, but I have no manuals for it (it needs to be controlled via the IEEE488 bus). Does anyone know where I can find them? In particular the programming manual.Thanks.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 06, 2022, 06:49:45 pm
content: I did not look specifically for your manual but this person has lots of good copies of HP and other manualshttp://artekmanuals.com/manuals/hp-manuals/Possibly this can help:https://forums.ni.com/t5/Instrument-Control-GPIB-Serial/help-talking-to-hp-4141/td-p/1143322

author: chilternview
author_rank: Frequent Contributor
timestamp: December 06, 2022, 10:01:56 pm
content: Thanks, that is just what I'm looking for!

author: Swainster
author_rank: Frequent Contributor
timestamp: December 06, 2022, 11:07:45 pm
content: Just to add a +1 for Artek - I've been very satisfied with the 2 or 3 manuals that I've purchased and downloaded from them. They were all professional quality reproductions from originals scanned by themselves.

author: Wallace Gasiewicz
author_rank: Super Contributor
timestamp: December 07, 2022, 12:03:52 am
content: I have also ordered a few manuals from Artek. They are much better than any free manuals I have downloaded from the web.The schematics, when they are available. are especially more clear from Artek

author: precaud
author_rank: Frequent Contributor
timestamp: December 07, 2022, 02:47:01 pm
content: I went through this exercise a few years ago, looking for a service manual for it. Artek doesn't have manuals for the 4141B. The only manual I found then is the one found in the link you posted.Now there are now several links like this one on xdevs, with probably the same manual:https://xdevs.com/doc/HP_Agilent_Keysight/HP%204142B%20Operation%20with%20Plug-Ins.pdfStill have not found a service manual.
Siglent SDG2042x output channel led failure - Page 1
Forum section: electronics / testgear

author: natman69
author_rank: Regular Contributor
timestamp: December 04, 2022, 11:32:26 am
content: I've found that on my SDG2042x the output led is died on channel 1I want to replace it but before opening the case I want to know which new led I need to buy (smd size, Vf, etc.). So I can order in advance the needed correct spare part.Also I have not found any picture of the front panel pcb.Someone can help?Thx

author: tautech
author_rank: Super Contributor
timestamp: December 04, 2022, 06:55:24 pm
content: I'll try and get this from Siglent for you, might take a day or 2.I had a 1000 series apart years ago but never took any notice although I'd imagine they are nothing special and in 0603 or 0805 form factor.

author: natman69
author_rank: Regular Contributor
timestamp: December 04, 2022, 07:01:33 pm
content: Thank you

author: tautech
author_rank: Super Contributor
timestamp: December 05, 2022, 04:32:28 pm
content: 0603 LED info from Siglent.

author: natman69
author_rank: Regular Contributor
timestamp: December 05, 2022, 07:39:35 pm
content: Thank you very much!I will keep you informed about the reparation. And I will post pictures of the keypad pcb.
Replacement fan for HP 5326b/5327b counter/DVM? - Page 1
Forum section: electronics / testgear

author: deafen
author_rank: Contributor
timestamp: December 05, 2022, 02:31:00 pm
content: I justified this purchase with the logic that I didn't have a standalone frequency counter, I love Nixie tubes, and another DC DVM can never hurt, right?Anyway, the soft, calming glow of the Nixies is somewhat offset by the loud, grinding, humming fan. Has anybody replaced one of these with a quiet modern fan? What part did you use?

author: veedub565
author_rank: Frequent Contributor
timestamp: December 05, 2022, 07:43:31 pm
content: I picked up one of these recently, the fan in mine was also a bit noisy. I tried a bit of switch cleaner in the mechanism and seemed to quieten it down. Might be worth a try.

author: factory
author_rank: Super Contributor
timestamp: December 05, 2022, 08:13:06 pm
content: Probably needs oiling, some of the old manuals recommend how often this was required.Or might want carefully taking apart, to clean off the old dried out oil first, before adding new oil.David

author: coromonadalix
author_rank: Super Contributor
timestamp: December 06, 2022, 05:52:12 pm
content: Most of the fans are sleeve based, even with lubrification they will jam, sometime they are sealed with an rubber bushing / washer under the sticker,You lift the sticker and the rubber, i put teflon oil "Tufoil" and extend their life that way, but if they have runned for a long time and look burned or make a grinding noise, they wont last long even oiled.You need to find "real" ball bearing ones for longevity
SPD3303X-E Imbalanced current draw between channels in parallel mode - Page 1
Forum section: electronics / testgear

author: jeraymond
author_rank: Contributor
timestamp: December 03, 2022, 04:31:00 pm
content: Hello,I'm trying to troubleshoot an issue with my SPD3303X-E (hacked to SPD3303X) power supply when running in parallel mode. In parallel mode the current draw from channels 1 and 2 are imbalanced. The unit will draw most current from CH1 up until CH1 hits the 3.2 A limit. Then further current draw will be supplied from CH2.I'm unable to get a full 6.4 A out of the unit (i.e. 3.2 A per channel) in this mode. The voltage collapses around 6.2 A total draw. Individually I can get a full 3.2 A on each channel in regular mode.If I manually wire channels 1 & 2 in parallel and operate them independently I see similar current imbalance.I can get up to 6.4 A total current though.I found a video on YT where someone with the same unit sees equal distribution of current between the channels. Is the current imbalance between channels normal or an issue with my unit perhaps?My unit is hardware version V3.0 and software 1.01.01.02.07R2 which seems to be the latest for this hw rev. I've been testing connected to a DC electronic load.

author: Tjuurko
author_rank: Regular Contributor
timestamp: December 06, 2022, 03:39:00 am
content: My SPD3303X has similar behavior. In "parallel mode", I "help" with such jumpers:

author: modoran
author_rank: Regular Contributor
timestamp: December 06, 2022, 06:37:13 am
content: Maybe the relay has problems with increased contact resistance and needs to be replaced, worth checking.

author: doppelgrau
author_rank: Contributor
timestamp: December 06, 2022, 10:34:48 am
content: My guess is, that internally both channels still run independent, just a relay birding them.So if one channel is set a few millivolts higher ...
Scope Over-shoot Measurement - Page 1
Forum section: electronics / testgear

author: daveyk
author_rank: Frequent Contributor
timestamp: December 05, 2022, 04:49:09 pm
content: Look at the attachment. Any idea why the MSO4104 can not read +Overshoot? I've tried "full record", "Screen Gating" and cursor gating. I've compressed the sweep.The only way I can get it to read +overshoot is to lower the channel amp v/division level (increase scope gain). But then since the negative part of the signal is clipping, you can get any +overshoot reading you want by varying the channel range. Once the lower portion does not clip, it no longer reads +over-shootThe TDS3000 series is better at it, but a lot of the time you must compress the sweep rather heavily for it to read.

author: tautech
author_rank: Super Contributor
timestamp: December 05, 2022, 04:53:24 pm
content: Engage Peak detect in the Acquisition menu ?

author: 2N3055
author_rank: Super Contributor
timestamp: December 05, 2022, 05:15:44 pm
content: Try longer timebase, to capture two pulses.Peak measurement is done by establishing max peak level and a "top" of signal plateau, the voltage level of settled signal.Usually by means of histogram. If settled signal and top signal is same, there is no overshoot. If you have some peak, and then signal settles to some value and stays there, scope takes those two and calculates overshoot. There are some more things in algorithm, like peak has to come after rising edge etc..So I presume scope cannot establish clean histogram and is confused.As I said, try capturing longer period so scope captures two pulses and can see periodicity...

author: daveyk
author_rank: Frequent Contributor
timestamp: December 05, 2022, 05:28:42 pm
content: "Try longer timebase, to capture two pulses."On the TDS3000 series, that works; not on the MSO4104. The only thing that seems to work is to set High-Low Method to Histogram. Of course that looks bad for screen shots as the Fall Time, Pulse Width and +Overshoot measurements all show "Unstable Histogram", but the +overshoot measurement is correct, as is all the other "unstable: measurements. I wish I could turn off the "unstable Histogram" flags.
Hameg HM407 oscilloscope display problem - Page 1
Forum section: electronics / testgear

author: gboutique
author_rank: Newbie
timestamp: December 04, 2022, 11:39:31 pm
content: My hameg HM407 analog-digital oscilloscope is having a display problem on the screen. All display is shifted 3mm down. I have searched the service diagrams, and can't find the trimmer that will allow me to correct this problem. Can someone help me or guide me?

author: Andy Watson
author_rank: Super Contributor
timestamp: December 05, 2022, 12:16:03 am
content: It could be a trick of the camera or lighting, but is that the top of the tube that I can see? Looks like the tube has physically moved down.

author: gboutique
author_rank: Newbie
timestamp: December 05, 2022, 02:25:33 pm
content: no, no trick... the tube is fine, fixed and aligned. the problem is the whole frame display is now shown deviated a few millimeters downwards.
DMM6500 vs 34401A - Page 1
Forum section: electronics / testgear

author: jayk
author_rank: Regular Contributor
timestamp: December 03, 2022, 11:14:04 pm
content: Just got a new DMM6500 (after waiting months). Started playing with it and comparing it to my trusty 34401A, which hasn't been cal'd in probably a decade. The 34401A is really holding it's own so far - it actually looks to be slightly more accurate in terms of frequency measurement (same signal to all three instruments... the 53181A reference is coming from a GPSDO).

author: Hydron
author_rank: Super Contributor
timestamp: December 04, 2022, 06:31:43 pm
content: Looking good, my pair differ a little more than that @ 10V but still agree within the 34401A's 1yr spec, despite it not being calibrated in the 15 years since it left the factory (only the last few months were in my hands).I find it pretty handy having both on the desk - the DMM6500 is great for making more involved measurements e.g. when you want statistics, graphing, complex trigger setups, logging etc, but the 34401A always has leads in it and gets turned on first when I just want a quick measurement, or I need need two meters at once (sure a portable meter will also turn on ~instantly but you have to fish it out of the drawer and it's not as nice to use).
SOLVED: Rigol MSO5000 - Unable to change Band Filter start/stop limits - Page 1
Forum section: electronics / testgear

author: oldjackbob
author_rank: Newbie
timestamp: December 04, 2022, 04:47:57 pm
content: Solvedper this post:https://rigol.force.com/support/s/article/Setting-Filter-Frequency-on-MSO5000-MSO7000-and-MSO8000-Oscilloscopes[Original post]Hi,New user of a MSO5074 'scope. I'm unable to modify the start/stop frequencies (wc1/wc2) of any of the band filters (LowPass, HighPass, BandPass, BandStop) in the Math operators, they all seem to be locked at 40MHz/80MHz for start/stop.Any advice?
Recommend test / QA setup for qualifying analog products - Page 1
Forum section: electronics / testgear

author: loki42
author_rank: Frequent Contributor
timestamp: December 04, 2022, 01:10:31 pm
content: I need to adjust some trim pots to tune the bias of some transistor and jfet stages. I would also like to check the calibration of filters. Is there a nice way to have a go / no go Bode plot so I can measure overall gain and cut off frequency as part of the QA process? I need to measure a number of voltage during the test as well. I have a 34980A switch with a reed multiplexer, a DMM6500 from Keithley, and R&S oscilloscope with function gen and Bode plot. I also have stand alone function gens and spectrum analysers. I only need to measure up to audio frequency (20khz)Should I write something for something like a pi that coordinates the firmware flashing and QA test over scpi? Is pyvisa or something like that the best approach? I'm comfortable with programming. Should I route things to the scope and multimeter or would an audio interface be a better option for checking the filter behaviour? Has someone automated this before?
Analog discovery 2 Now $199 - Page 1
Forum section: electronics / testgear

author: simba15
author_rank: Regular Contributor
timestamp: December 02, 2021, 04:29:25 pm
content: So looks like the price had dropped to $199 on the analog discovery 2!https://digilent.com/shop/analog-discovery-2-100ms-s-usb-oscilloscope-logic-analyzer-and-variable-power-supply/At this price it is quite competitive with devices like Hantek and Owon.Any one have any recommendations for USB Oscilloscope, should i try the Saleae clones?Thanks!

author: Fungus
author_rank: Super Contributor
timestamp: December 02, 2021, 05:39:37 pm
content: There's already a "Pro" device. Maybe this is just stock clearance to get rid of all the IIs.PS: It used to cost $199 so this is just going back to pre-shortage prices.

author: rsjsouza
author_rank: Super Contributor
timestamp: December 02, 2021, 07:28:55 pm
content: Quote from: Fungus on December 02, 2021, 05:39:37 pmHey, it is black friday sale!

author: radiolistener
author_rank: Super Contributor
timestamp: December 02, 2021, 08:30:26 pm
content: nice tool, but 200 USD is too expensive. 50 USD will be ok.

author: Andrew_Debbie
author_rank: Frequent Contributor
timestamp: December 02, 2021, 09:23:33 pm
content: £346 from Farnell. (ugh)

author: Chris Learing
author_rank: Contributor
timestamp: December 03, 2021, 12:32:57 pm
content: I bought one just last week from DigiKey, with a couple of minor extras, for £389. This thread hasn't particulalry cheered me up

author: simba15
author_rank: Regular Contributor
timestamp: December 03, 2021, 04:07:34 pm
content: Well my hope is to only help others that may be interested.Its hard to see the history or pricing with so many factorys currently ( covid, Chipageddon ect).I agree it would fly off the shelf's at a lower price.Are there Clone options like the Saleae logic?

author: msquared
author_rank: Regular Contributor
timestamp: December 03, 2021, 04:57:16 pm
content: Back to $399 today. Must have been a 1 day sale.

author: blurpy
author_rank: Regular Contributor
timestamp: December 04, 2021, 10:34:20 am
content: It was "cyber week" sale for Thursday only.

author: rsjsouza
author_rank: Super Contributor
timestamp: December 03, 2022, 02:56:59 am
content: Sorry about reopening this thread, but the folks that were interested in the Analog Discovery for $199 might be interested in knowing this is slashed to US$159.90 during this week.https://digilent.com/shop/cyber-week-daily-deals/

author: Fungus
author_rank: Super Contributor
timestamp: December 03, 2022, 09:36:43 am
content: Quote from: rsjsouza on December 03, 2022, 02:56:59 amThatis a bargain.

author: PA0PBZ
author_rank: Super Contributor
timestamp: December 03, 2022, 11:27:33 am
content: And another 10% off with couponcode NEWSLETTER

author: voltsandjolts
author_rank: Unknown
timestamp: December 03, 2022, 11:45:07 am
content: US$160 + $60 shipping plus 20% import tax/duty = GBP220 ishThe bode plotter is quite nice but thats the only thing I would use it for.

author: precaud
author_rank: Frequent Contributor
timestamp: December 03, 2022, 03:06:14 pm
content: Almosttempting at that price...
Searching for ID and manual for a Rohde&Schwarz RF Coverage Analyzer - Page 1
Forum section: electronics / testgear

author: nikodem
author_rank: Regular Contributor
timestamp: December 03, 2022, 03:01:37 am
content: Hi All,I was offered to buy an Rohde & Schwarz "RF Coverage Analyzer PCSP" for an quite good price (the type of price, that I can just spend to have some fun), but nowhere I can find any information regarding this piece of kit. I've searched the web, old R&S catalogues and nothing. The model number is 1120.4009.03.Any ideas?

author: nikodem
author_rank: Regular Contributor
timestamp: December 03, 2022, 12:37:30 pm
content: Photo:

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: December 03, 2022, 02:25:32 pm
content: That device is just an industrial pc for test systems. It was used in the GSM Interference Analyzer ROGER (TS9958). The ancestor of the TSMx mobile network scanners and ROMES.
Peaktech 4094 - Page 1
Forum section: electronics / testgear

author: wmattias
author_rank: Newbie
timestamp: December 02, 2022, 09:15:46 pm
content: Anyone out there who has (or had tried) the Peaktech 4094 Bench multimeter? Looks nicely priced @ €250 but question is what you get. On paper 4.5 digits and has graphing/math/4-wire/…https://www.peaktech.de/uk/PeakTech-P-4094-Graphical-bench-multimeter-55.000-counts-with-TFT/P-4094

author: mcinque
author_rank: Unknown
timestamp: December 02, 2022, 09:26:35 pm
content: Stay away from Peaktech, they are just rebranded and more expensive products, nothing more.I once asked them if they sold at higher prices for a specific reason the same products that can be found on the market at lower prices (e.g., better components inside, better capacitors) but instead of bringing decent arguments in their favor (better service, support, or whatever) they just got offended and "walked away" from the discussion.I cannot think of anything worse than Peaktech: several products are junk while others are decent products but still at a higher price and without added value, but the perception is given that Peaktech it is a brand, even a serious and respectable one.If you really like that DMM find the original product and purchase that.Found, Owon XDM2041:https://eleshop.eu/owon-xdm2041-multimeter.htmlYou can buy it at least 40% cheaper.

author: wmattias
author_rank: Newbie
timestamp: December 03, 2022, 01:22:00 pm
content: Ah, thanks!!! Great info!

author: Traceless
author_rank: Frequent Contributor
timestamp: December 03, 2022, 01:31:32 pm
content: This is a rebrandedOwon XDM2041(which you can get for under 200€), I actually do have the exact same meter sold under theVoltcraft brand. The price for this one is way to high. But if there is anything particular you want to know about this meter I think I can help.P.S.: If you like this meter you might want consider to pay a bit more for either the XDM3051 or even the Siglent SDM3055.