hybridfree/eevblog-posts huggingface dataset:
HP 8560E problem: need calibration or repair? - Page 1
Forum section: electronics / testgear

author: tektech
author_rank: Newbie
timestamp: September 09, 2024, 01:17:33 am
content: I have a HP 8560E that was working fine when it was put on the shelf a couple of years ago but when I dusted it off last week the signal amplitude from the cal out was showing down about 40dbm. I setup the tracking generator sweeping the full range and it was down across the range.I checked the cal out with my 8594E and it was off a couple of dbm and it was down the same 40dbm using the cal out of the 8594E into the 8560E. I did try the internal cal and it did not change anything,I've never worked on a SA, just used them so I don't know if calibration could fix this of if I should start digging through the circuits.Any hints appreciated.

author: tektech
author_rank: Newbie
timestamp: September 09, 2024, 01:02:16 pm
content: I found the sections in the service manual on testing the input attenuator and other front end modules so I'm going to step through those.
SLA1016 not recognized by SDS1104XE after firmware update - Page 1
Forum section: electronics / testgear

author: FrankDS
author_rank: Newbie
timestamp: February 13, 2024, 02:53:00 pm
content: I accidently downgraded my SLA1016 to revision 7.8.1.8 and now it is no longer recongnized by my SDS1104 running the latest firmware (6.1.37R10). I think I will need to downgrade my scope's firmware back to a point where it will recognize the SLA1016 - just not sure how far back to go though for SDS1104 firmware to recover from this mistake!Thanks,Frank

author: Performa01
author_rank: Super Contributor
timestamp: February 13, 2024, 04:53:04 pm
content: It should be V6.1.26 (Release Date 09.26.18 ).

author: FrankDS
author_rank: Newbie
timestamp: February 13, 2024, 06:46:16 pm
content: Thanks a lot. Worked immediately after I reverted back to the old firmware!

author: analog pro
author_rank: Newbie
timestamp: September 11, 2024, 09:36:21 pm
content: Hello. Can anyone please send me owon sds1104 firmware. Thanks in advance

author: tautech
author_rank: Super Contributor
timestamp: September 11, 2024, 09:45:25 pm
content: Quote from: analog pro on September 11, 2024, 09:36:21 pmBest you go look on Owon websites.
Tektronix Report Generator for Windows XP (TDS6804B) - Page 1
Forum section: electronics / testgear

author: cmed9
author_rank: Newbie
timestamp: September 04, 2024, 08:59:36 pm
content: Can someone please point me to a version of Tektronix Report Generator that will install under Windows XP on a TDS6804B scope? V3.3.3 on the Tektronix website claims to work with XP and TDS6000B series scopes. When trying to install, it stops with a message that at a minimum Windows 7 is needed.Thanks!

author: calibrationfixture
author_rank: Regular Contributor
timestamp: September 08, 2024, 07:39:06 am
content: Hi cmed9,Report Generator is an Option Addition. You must enable the Option first. The software is part of the Option Software. You don't have to install it separately. This is the case for the CSA/TDS7000B and TDS6000B/C Series as far as I know.Calibrationfixture
Tektronix T935A Oscilloscope Repair - Page 1
Forum section: electronics / testgear

author: jimthegreek
author_rank: Contributor
timestamp: September 08, 2024, 10:28:44 am
content: Does anyone know if there is a support group to repair this tektronix scope? There is a slight bit of smoke coming up from one of the boards but I can’t seem to get to it to see it. I have the manual downloaded already. Can anyone point me in the right direction? Thanks.

author: squadchannel
author_rank: Frequent Contributor
timestamp: September 08, 2024, 10:42:54 am
content: For vintage Tektronix, visit here.https://groups.io/g/TekScopes

author: jimthegreek
author_rank: Contributor
timestamp: September 08, 2024, 01:14:34 pm
content: Thanks! However, it doesn’t have an option to search from thousands of models for my T935A. How can I get around that?
Recommendation for insulation tester for automated testing line - Page 1
Forum section: electronics / testgear

author: georgd
author_rank: Regular Contributor
timestamp: September 04, 2024, 03:43:56 am
content: I need an insulation tester that can be controlled from a computer, with 1000V test voltage. This would be part of an automated production line.Could someone recommend such a device?Thank you,Georg

author: Tjuurko
author_rank: Regular Contributor
timestamp: September 04, 2024, 06:25:06 am
content: UT512 can connect to a computer.https://eleshop.eu/uni-t-ut512-insulation-resistance-tester.htmlI don't know about the possibility of control from a computer.

author: jonpaul
author_rank: Super Contributor
timestamp: September 04, 2024, 06:29:30 am
content: "insulation tester" is a wide term.Safety?AC/DC 1000V?leakage current to earth?range of current?application eg transformer/motor insulation test?Medical equipment compliance?Instrument manufacture?For old line USA firms, see Rod-L, Hipotronics, Stangenes Industries...Jon

author: georgd
author_rank: Regular Contributor
timestamp: September 04, 2024, 06:46:08 am
content: Here is a more detailed description of requirements:- The factory produces mains (230/380 V) cables equipped with cable head on both side- Instrument is intended to use in a factory line as test gear.- Test test voltage is 1000V DC and the resistance between the cable conductors needs to be measured.Georg

author: jonpaul
author_rank: Super Contributor
timestamp: September 08, 2024, 07:25:52 am
content: https://www.megger.com/en/type/electrical-insulation-testingROD-LDanbridgeHiPotTronicshttps://www.hubbell.com/hipotronics/en/products/electrical-electronic/test-equipment/instruments/cl/547141enjoy,Jon

author: Kean
author_rank: Unknown
timestamp: September 08, 2024, 12:26:30 pm
content: One of my customers uses the GW Instek GPT-9804 on the production line for their final insulation and ground bond tests.It is controlled via LabView.GW Instek have cheaper models in the series if you don't need all the features.https://www.gwinstek.com/en-global/products/detail/GPT-9800
Leeds & Northrup 8690 Millivolt Potentiometer - Page 1
Forum section: electronics / testgear

author: trobbins
author_rank: Frequent Contributor
timestamp: September 07, 2024, 09:33:35 am
content: I'm starting to check out a 101 mVdc FS null potentiometer - originally for thermocouple measurements, but I'll likely use it for millivolt measurement comparisons as it has 20uV minor tabs, so down to and below 10uV resolution.The 8690 model is identified in the L&N 1972 catalog (on xdevs.com), but not much else is on-line of similar relevance afaik. The 8690 has a base 0.05% spec, with switched 10mV steps using 0.01% divider resistors, and a nice 2 turn slider with a robust cam for 11mV FS dial, from what would be a 100mV FS internal reference (derived from what was a corroded 3x D-cell battery pack).Null measurement on my unit appears to use the L&N 324050 null detector kit (from 1972 catalog) - but it's not obvious if this was a retrofitted kit, or came original. This detector appears to be used in the 8695-2 temperature potentiometer. The detector uses 2x 4.05V batteries (each battery made up from 3x MR50 mercury oxide cells in a 'AA' style cylindrical pack). Interestingly, the detector uses a pcb with a single 8-pin can IC made by National Semi that has an unknown (as yet) part number "S:/H8340 193207 SL60015". Any clues on this part (presumably an opamp)? I'll have a go at reverse engineering the pcb schematic.The internal reference is an L&N Weston cell, which so far seems to be displaying reasonable stability, and with a voltage indicating maybe more than a decade of service life still to go (using HP 34401A hi-z loading).The instrument didn't come with a manual, so I'd appreciate anyone able to make a scan (even the schematic would be useful), as that would make it easier to confirm the internal divider resistors haven't been stressed and to confirm calibration with the present Weston cell voltage.Ciao, Tim

author: trobbins
author_rank: Frequent Contributor
timestamp: September 08, 2024, 03:11:58 am
content: The null detector appears to be based on a 100x gain 741 opamp, given the vintage, and IC pin assignments on the pcb.Given a 2x 4.05V HgO battery feed, the opamp may well have been a factory selected 741 part with confirmed operation down to at least +/-4V, rather than the datasheet cutoff of +/-5V for performance. That indicates a simple replacement of two 4x AA (or AAA) packs should be fine, and should fit in the plastic battery housing provided for the main 1.5V battery.The 10mV switched step dividers use 5 ohm 0.01% L&N resistors. The 2-turn slider is about 11.5mV span for 720deg rotation, so about 6 deg for 100uV, and 0.6 deg for 10uV resolution (half a minor tab) of the ww resistance wrapped on the support wire. Rotation of half a minor tab is also about the available turn resolution of ww resistance turns and the wiper contact.
Help - thread where replacing cheap caps in SMPS improved analyzer noise floor - Page 1
Forum section: electronics / testgear

author: EE-digger
author_rank: Frequent Contributor
timestamp: September 06, 2024, 04:44:06 am
content: Searching for an hour and need help.I'm sure it was for a Siglent spectrum analyzer but by replacing a handful of cheap capacitors in the SMPS, the noise floor of the instrument was improved, most noticeable as the frequency increased.Searched by key words, looked for the photos of the removed caps ... NADA

author: EE-digger
author_rank: Frequent Contributor
timestamp: September 07, 2024, 05:27:15 pm
content: The thread I'm looking for had photos of a handful of cheap, replaced capacitors in the Siglent or Rigol instrument. The noise floor improved with frequency with the new caps.Cannot find it

author: EE-digger
author_rank: Frequent Contributor
timestamp: September 07, 2024, 09:04:09 pm
content: Found it. The thread was on the Rigol RSA5000 and had w/wo images of the noise floor improvements.
Teardown of SilverCrest H14338 "UV monitor" - Page 1
Forum section: electronics / testgear

author: CosteC
author_rank: Regular Contributor
timestamp: September 06, 2024, 05:28:22 pm
content: Not exactly EE test equipment, but interesting piece if you need to measure if UV A for resin curing or need to check if UV lamp for lizard is working...I got it cheaper than UV photodiode at Digi-Key (photodiode alone, without shipping) so I considered it a success.Dongle is small, not greatly done and powered from CR2032 so quite handy. Documentation is quite horrible, not mentioning any measurement qualities, only UV index and rough estimation of estimated time safe to be exposed to UV. No wavelengths, no powers (mW/m2), nothing measurable.It is entirely blind to visible light from LED bulbs, also for near UV - around 420 nm. Sunlight through double glazed window also is not visible. As expected.Inside - nothing particularly fancy, including MCU under resin blob. Except sensor - I was curious what it is.Obviously no marking. But accidentally, I know how GUVA-S12SD looks like, you can do comparison yourself. As GUVA-S12SD is sensitive in 240 nm to 370 nm so far from "normal photodiodes"As expected, sensor is quite directional. It is easy to get UV index reading between 1 and 4 just by changing angle. Photos taken around 11:00, UV index = 4 early September is not impossible.

author: thm_w
author_rank: Super Contributor
timestamp: September 06, 2024, 09:43:28 pm
content: Where did you purchase from?Aliexpress has some for $10-20 but not sure what sensor its usinghttps://www.aliexpress.us/item/3256806167858753.html

author: CosteC
author_rank: Regular Contributor
timestamp: September 07, 2024, 01:24:32 pm
content: Silvercrest is LIDL brand. A large groceries (mainly) shop network, German origin.KF-90 from Aliexpress - no idea what is inside.Now, if I would like get UV photodiode itself cheaply, I would go for things like "UV sensor" daughter boards like this:https://www.aliexpress.us/item/32242855827.html?spm=a2g0o.productlist.main.3.c0db6e1eTWS4wi&algo_pvid=267bfb36-1a9a-49f7-a26e-cb7fa495c80d&algo_exp_id=267bfb36-1a9a-49f7-a26e-cb7fa495c80d-1&pdp_npi=4%40dis%21PLN%217.67%213.91%21%21%211.94%210.99%21%40211b815c17257152346835332ef5f9%2151679812052%21sea%21PL%210%21ABX&curPageLogUid=PzofzDeD5Nb4&utparam-url=scene%3Asearch%7Cquery_from%3AFor more reliable applications I still would go to reseller like Farnell or TME.
Telequipment CT71 Curve Tracer - Teardown - Page 1
Forum section: electronics / testgear

author: sean0118
author_rank: Frequent Contributor
timestamp: September 09, 2024, 11:04:25 am
content: Hey, just having a look at a curve tracer I've had for awhile, not a lot of photos online so thought I'd take some.I'm unsure of its history but the blue axial cap on the main board has leaked and the horizontal Volt/Div knob is loose too. Also no test fixtures....https://w140.com/tekwiki/wiki/Telequipment_CT71
Vintage Teardown: RFT G-1004.501 (DMM) - Page 1
Forum section: electronics / testgear

author: kblue
author_rank: Regular Contributor
timestamp: September 03, 2024, 11:06:54 pm
content: Vintage Teardown: RFT G-1004.501 (DMM)Part Nr. 1 - The outsides!Greetings!Mayhaps stuff like this is kinda interesting for some folks. Its a simple one but i do like this old stuff and techThis particular unit was sold on:25. October 19903 1/2 CountsDC V ranges:200 mV, 2 V, 20 V, 200 V (0,25% +2) // 1000 V (0,5% + 2)DC A ranges:200 mA, 2 mA, 20 mA, 200 mA, 1000 mA (0,5% +2) // 10 A (1% +2)AC V ranges:same as DC (1% +4 for all ranges)AC A ranges:same as DC (1,25% + 4 for all ranges)Ohms:200, 2k, 20k, 200k, 2000k, 20M (0,5% +3)Diodetest:0,1 mA / 0 - 1,999 V (max. out: 3,4 V) + ContinuityBatterylife:>1500 hThis meter seems to be working just fine, except for the black zones within the LCD. So far it seems to be within spec! So nothing to repair i guessFor the first post, i'll show some pictures from the outside, the battery compartment and the schematics. There will be more from the inside later this week.With the original box, documents in rus + ger language, schematics and a warranty card its quite a good catch!The display (9mm in heigh) has its problems. But its usable! I could remove the polarization filterBut as some of you know, it wouldn't be usable from that point forward.The original schematics. In this case the RUS variant. The other one would be in german.The bottom side with some markings like "RFT veb mikroelektronik >karl marx< erfurt" (RFT = Rundfunk- und Fernmelde-Technik / veb = Volkseigener Betrieb [publicly owned enterprise) and yes, this meter needs 6 batteries! And no, your eyes don't deceive you ... i use miserable Vartas. I had these on hand. I'm sorry! Please put the stones back to the ground where they belong and don't use them as a throwing weapon!

author: kblue
author_rank: Regular Contributor
timestamp: September 07, 2024, 07:19:46 am
content: Part Nr. 2 - The inside!But wait, there is more!Ye, switches are big and they take a lot of space.Big solderjoints for the 10 A Shunt. Guess something like that wouldnt pass safety ratings today?1kV Input Section with a big resistor. Speaking of Resistors ...This meter is packed with resistor-networks. Some might be even precision work (-: What else do we need in such a nice meter? Mhmm.Chunky diodes of course! Who does not want some chunky diodes in his / her meter? It seems these diodes or rather the legs are cursed with tin whiskers?One of two main attractions! The Chip C7136D, which seems to be a copy of theICL7136 (Data Sheet from analog.com).The second main attraction! Our 1,235 V Vref B589Nm (50 ppm/C°) which is a copy of the AD589. No surprise at all, eh? So far the meter seems stable and accurate for its 2000 Counts. The display is a bummer, mayhaps i'll source another unit with missing parts or something for a display-swap.Best wishes!

author: coromonadalix
author_rank: Super Contributor
timestamp: September 07, 2024, 01:24:09 pm
content: must be a rebranded intersil 7106 lcd dmm
Agilent (Keysight) VEE old versions running in Compatibility mode? - Page 1
Forum section: electronics / testgear

author: Uky
author_rank: Regular Contributor
timestamp: September 07, 2024, 11:33:14 am
content: Greetings forum members,I have a couple of boxes "NOS" with Agilent VEE. Version 8.0 and 8.5complete with license information. Never installed. (Boxes dated "2007")They are listed as useable with Windows Vista (32bit), 2000 SP4 or higheror XP SP2 or higher.Anyone tried using any of theese releases in a W10 environmentusing compatibility mode?

author: HighVoltage
author_rank: Super Contributor
timestamp: September 07, 2024, 12:51:54 pm
content: Most likely will not run under W10, not even in compatibility mode.But on a Win7, installed virtually, on a W10 machine should run it perfectly.
iron core xformers vs switch mode (hot air stations, soldering, etc) - Page 1
Forum section: electronics / testgear

author: linux-works
author_rank: Super Contributor
timestamp: September 06, 2024, 01:25:41 pm
content: wondering why vendors are still building (shipping modern products) using big heavy transformers instead of switch mode psu.I'm shopping for a hot air station and most of them are overly heavy for no reason other than the big trafo (custom one, too) inside. but not all stations do that. same for soldering; many are now using switchers for their psu but there are hold-out vendors and models that dont.is there any advantage to the iron core style? negatives that I see are:- cost (I have to believe its more expensive to get custom wound heavy trafos)- smell (reviews talk about the laquer smell that takes a lot time to wear off to where the smell is not a problem)- vibration/whine (eventually they all make noise unless they are very well made)- weight/shipping (can cost $50 and more to ship products vs the same one in switch mode)- efficiency (way less efficient than a switcher)and you dont even have to 'design' a switcher; you can just use standard designs. its hard to believe each new box needs a new psu designed for it.so, what's the deal? is it just ignorance?when I see a pure DIY from someone and it has a linear psu, I excuse them. but when a vendor who knows better does it, I really wonder.

author: ftg
author_rank: Frequent Contributor
timestamp: September 06, 2024, 01:30:23 pm
content: I can't hear the transformer in my Aoyoe 852 hot air station from under the air pump and other general rattling.The transformers mass is a feature, not a bug (imo), as it helps damp the mechanical vibrations.

author: BrokenYugo
author_rank: Super Contributor
timestamp: September 06, 2024, 01:53:34 pm
content: IIRC most of the soldering stations with a transformer feed the low voltage AC directly to the heater and switch using a triac so it's sort of design related.The other thing that comes to mind is a basic split bobbin mains power transformer will probably have less leakage than a cheapo SMPS.I'll hazard a guess hot air sells less than irons, so that may just be reusing common stuff they already have.In the case of cheap imported stuff I trust a power transformer to be built right with proper insulation a lot more than a SMPS.
Rohde & Schwarz UHP BN1950 High Voltage Tester Restoration. - Page 1
Forum section: electronics / testgear

author: thejazzcat
author_rank: Newbie
timestamp: September 06, 2024, 12:35:57 pm
content: Hi,I'm trying to restore this old unit from R&S to test the insulation of an output power transformer.First thing I noticed was a low voltage at the multiplier output, about 900 VDC. I checked the capacitors in this section and found that most were leaking at low voltage and their capacity has dropped to around 0.33 µF. I then replaced these capacitors (the next ones I could find were 0.33 µF at 630 V) and the 4 selenium rectifiers for 1N5408 diodes. Now I get about 2.25 K VDC at the output of the multiplier. One thing solved.The device measures the resistance in the 50 V range correctly, almost exactly! But when I start increasing the voltage range, the resistance begins to decrease.I have recorded some measured values that I get in megaohm with different resistance values. R(M) = resistance to be tested in megaohms. You can find them in the attached pictures. The second table was recorded to document something that happens when I try to measure the output voltage at the + and - connections. The first column corresponds to the measured value that I receive on a Simpson 467 DMM (which offers the BN1950 an input impedance of 10M), the second with the same DMM and an additional 5 kV probe (input impedance of 100 M). With the probe I can check all the voltages up to 2 KVDC.I have been working in guitar tube amplifiers for a while, but my electronics experience is limited. This circuit seems so simple, but I don't know exactly what to do to fix this behavior or to understand the reason for the lower readings at higher voltages.All resistors measured to specs, the multiplier ones have drifted in vale from 10M to 10.5 (I guess no problem here). The ones for the voltaje selector measure within specs. The meter was tested getting full deflection at a 100uA, consistent with the specs.I attached the corresponding schematic for reference.If anyone can give me some suggestions, that would be truly appreciated.All the best.Carlos
SIGLENT SDS3034X HD rate of rise measurement - Page 1
Forum section: electronics / testgear

author: BaNaN85
author_rank: Newbie
timestamp: September 06, 2024, 08:28:24 am
content: HiI need some help.I'm using the scopes automatic measurement function, looking at the 10-90% rise time measurement.The measuement is super off. It is not showing correct at all.A LeCroy wavesurfer is showing ~575ns 10-90% measurement which is pretty accurate compared to manually measuring with cursors.The Siglent scope is showing 260-300ns using the 10-90% measurementI try to change the threshold values between % and absolute values, no differenceI change the amplitude strategy between histogram and MAX-MIN values, no differenceI go to Analysis and change the analysis gate, no differenceI go to Analysis and change the histogram gates, no differenceAlso the measurement values is constantly jumping on the y-axisThis is like the most standard easy measurement and this scope can't do it

author: BaNaN85
author_rank: Newbie
timestamp: September 06, 2024, 08:54:32 am
content: Ok,So I tested another scope we have, same 10-90% measurement and that one shows correct.So I copy that ones setup to the scope showing wrong but still same. It cannot measure 10-90%.Doing a self calibration right now....

author: Martin72
author_rank: Super Contributor
timestamp: September 06, 2024, 09:03:47 am
content: Hi,Why not using the screenshot fumction ?

author: noisyee
author_rank: Contributor
timestamp: September 06, 2024, 09:45:02 am
content: That's weird.Try to set Cursors Mode to Measure, it will show you how the measured value come from.That may give more information to find out what's going wrong.

author: BaNaN85
author_rank: Newbie
timestamp: September 06, 2024, 10:29:25 am
content: Ok, after 1h selfcalibration over lunch the bad oscilloscope still showed wrong read on the rise times.I hooked up the good one and recorded with cursors on measure on CH2 rise time.Then I connected the bad scope and wanted to record how that ones cursor measure behaved.After restarting the bad scope, the measurements seem to work fine...Check pictures attached now
Telequipment CT71 Test Fixtures - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: September 06, 2024, 02:20:38 am
content: I am looking for the TO3/TO66 fixture for the Telequipment CT-71 Curve Tracer. If anyone has one they would like to part with and if not could provide some hi res pictures of the unit so I could make my own I would greatly appreciate it.The Tek part number for the fixture is 013-0119-00 but the number probably is not on the fixture.ThanksSamW3OHM
Serial decode on Rigol DHO814 - Page 1
Forum section: electronics / testgear

author: Bdm222
author_rank: Newbie
timestamp: September 05, 2024, 12:57:14 am
content: I'm finding the serial decode fails if the Channel menu is set for 10x probes. Has anyone else had this problem?

author: Fungus
author_rank: Super Contributor
timestamp: September 05, 2024, 05:11:07 am
content: Quote from: Bdm222 on September 05, 2024, 12:57:14 amYes, everybody.There's a new firmware out today. I haven't tried it yet but maybe it fixes it.

author: Fungus
author_rank: Super Contributor
timestamp: September 05, 2024, 06:53:46 am
content: Update: This is fixed in the new firmware.

author: Bdm222
author_rank: Newbie
timestamp: September 05, 2024, 05:04:13 pm
content: It looks like the scope does not consider probe scaling when doing the decode. I tend to set the scope to 10x on the probes and in the channel menu. In this configuration a trigger level of 2.5 volts for the decode produces garbage on a 5 volt waveform. But a trigger value of 30 volts for the decode trigger works fine. So, using the "Copy Trig" button will fail.

author: Bdm222
author_rank: Newbie
timestamp: September 05, 2024, 08:33:07 pm
content: Right you are. Firmware 1.03 fixed it.

author: Fungus
author_rank: Super Contributor
timestamp: September 05, 2024, 09:14:42 pm
content: Quote from: Bdm222 on September 05, 2024, 05:04:13 pmYes, it's a well-known (around here) bug.The voltage isn't scaled with the probe so the numbers are only correct with probe attenuation set to 1x mode.(nb. you can leave the probe switch in the 10x position, the attenuation setting is just a multiplier for the numbers on screen, nothing more)
Agilent PSA E444x series SA component level information - Page 1
Forum section: electronics / testgear

author: alan.bain
author_rank: Regular Contributor
timestamp: September 05, 2024, 08:42:23 am
content: Does anyone know of a source of component level service inftormation for the HP PSA series Spectrum Analysers?I have just repaired a PSU and suspect I have a fault in a LO - possibly the second, but the service manual only has a schematic of the backplane (which I admit was useful when fixing the PSU) but a little more information would be useful. I can find limited clip info on the ESA series but nothing on the PSA.Alan
Fluke 87-VI FC,  Prototype Product from Fluke Marketing - Page 1
Forum section: electronics / testgear

author: tomwilkinson
author_rank: Contributor
timestamp: September 05, 2024, 03:22:46 am
content: I received a marketing email from Fluke about a Fluke 87-VI FC with a link for more info:https://newproducts.fluke.com/?utm_campaign=IG-NA-MULTI-2024-AUG-VISION-VOC-EN-EML-1-A&utm_medium=email&utm_source=Eloquait is light on details and the photo looks like a mock-up.Well it turns out it is a marketing survey trick. When you click on the Download Datasheet link you get a web page "Fluke Multimeter Research Study" that states "Unfortunately, this product is not yet available. Your interest helps our researchers design a better product. We appreciate your participation in this experiment and we would love to hear any additional thoughts you may have about this prototype product."I filled out the form and asked for a review sample, we will see what happens.Tom, N8FDY
Beckman replacement probes - Page 1
Forum section: electronics / testgear

author: Benchtools
author_rank: Newbie
timestamp: September 04, 2024, 11:02:52 pm
content: I recently purchased a Beckman 9104 analog Oscilloscope that was sold in the 80's.It is a dual channel 40 MHz scope, but did not include any test probes.Any tips on buying some replacement , general purpose test probes ?Thanks
ATTEN 1102cal proble when using trigger in single mode - Page 1
Forum section: electronics / testgear

author: iostrym
author_rank: Newbie
timestamp: September 03, 2024, 09:53:40 am
content: Hi everyone,I read some stuff on this forum about ATTEN 1102CAL oscilloscope. I know original firmware may have problem but it's not mine and I can't update the firmware.for instance here :https://www.eevblog.com/forum/reviews/atten-ads1102cal-trigger-uncertaintyjitter-problem/but it is very specific whereas i'm looking for doing something really evident.I juste wanted to check because I would like to know if I'm facing a firmware bug problem or if I don't know how to use the oscilloscope.In fact, I don't succeed to make the trigger working in "single" mode.I want to display the rise of power up on a signal that will rise from 0v to 12V. I can display it at 0v, then I power up my circuit and I can see the signal at 12V.I configured the trigger in single mode and I wanted the oscilloscope to trig when the voltage rise a bit. for instance I set the trigger at 1V. but in single mode, the trigger never trig...do I miss something important ?

author: iostrym
author_rank: Newbie
timestamp: September 03, 2024, 10:27:40 pm
content: I have seen this video :I remember that ATTEN 1102cal has the same firmware than SDS1102CML+ (or SDS1102CNL?) so they are pretty identical.what I have seen in this video is identical to what I have tried so I don't understand why it didn't work in single mode.

author: iostrym
author_rank: Newbie
timestamp: September 04, 2024, 08:19:53 pm
content: it worked, I guess I didn't correctly configure the trigger that has a AC or DC setting...I successfully did a lot of observation but I don't succeed to do one.do you know if I could observe a clock signal around 100 Mhz and trigger the 12V signal of the alimentation ? clock signal should be approx 3.3Vduring my first observation I have the feeling that the clock signal generated a lot of noise on the other channel.my goal is to observe the generation of the clock when the 12V is rising...
Help with Differential Probe Limits - Max Differential vs Max to Ground  - Page 1
Forum section: electronics / testgear

author: NY2KW
author_rank: Regular Contributor
timestamp: September 04, 2024, 04:18:46 pm
content: I would appreciate help understanding correct use of a high voltage differential probe specification (MicSig MDP702) maximum input differential Voltage versus maximum voltage to ground. I want to use the probe as a single end active probe to trace small signals (~ 3MHz) in a RF tube amplifier with plate voltages ~ 200-300VDC. I believe my problem is in one of the LC tuned circuits between stages and there is full plate voltage at certain points I need to test.My basic question: am I correct that I can the probe at the 20x setting for single input referenced to chassis ground based on the CAT II limits or must I use it at the 200x setting (which has a much higher noise floor)? My signal levels at some point are in the 100mV range.Maximum differential input ratings:@ 20x : 70V (DC+AC PK)@ 200x : 700V (DC+AC PK)Max. Voltage to ground rating:CAT II 450VThanks in advanceJerry
HP 5350B LED Upgrade - Page 1
Forum section: electronics / testgear

author: W4PJB
author_rank: Regular Contributor
timestamp: September 03, 2024, 09:55:27 pm
content: Today I upgraded the LED's in my HP 5350B frequency counter. First, a huge thanks to Mr. Kerry Wong for his excellent writeup back in 2017http://www.kerrywong.com/2017/01/30/hp-5350b-backlight-upgrade/My backlight board was a little different than Kerry's, but the steps and components for the upgrade were the same none the less. I figured I'd do a quick writeup of my upgrade, in case anyone else is planning to do the same.As you may be aware, the 5350 has a terrible backlight from the factory. Practically invisible, really, under ordinary room light. Five very dim, yellow, LED's on each end of the display that edge-light the LCD screen. The upgrade is to use modern white LED's to replace them. Another issue I had was a lot of scratches and hazing on the plastic window covering the LCD. I didn't get any pictures of the process, but I solved this by using a small propane torch and gently "flaming" the surface of the window (once out of the unit) to polish the lens. I followed up with a microfiber towel and automotive "optical grade" polishing compound. It's not perfect, but it's FAR better than when I got the unit.Another challenge was bending the LED's and positioning them for soldering. To solve this, I 3D printed a fixture that held the LED's at the proper spacing at exactly 4.85mm from the surface of the board to the bottom of the LED's. A bit of 3/8" Kapton tape held it in place during soldering. I think the results speak for themselves; all of the LED's are pointing straight and exactly at the proper height. I'll be sure to include a link to the file if anyone is interested once I get it hosted.From here on out the pictures, along with Kerry's write up, pretty much speak for themselves. So without further delay, let's get to the pictures!Parts: Digikey # 1516-QBL8IW30C-NW-ND (quantity 10).

author: W4PJB
author_rank: Regular Contributor
timestamp: September 03, 2024, 11:10:54 pm
content: Here is the 3D file for the fixture. Please note the holes are slightly offset top to bottom by 0.15mm. The shorter side (4.85mm from edge of hole to edge of block) is what should be used on the board side.

author: Tony_G
author_rank: Super Contributor
timestamp: September 04, 2024, 03:40:43 pm
content: Nice - Was the result with the block better than the one without? Just wondering if it is more than just for holding the LEDs in place.TonyG

author: W4PJB
author_rank: Regular Contributor
timestamp: September 04, 2024, 03:41:44 pm
content: Thanks! I used the block for both. No way I was going to try to get those all lined up and soldered by hand!
Krohn-Hite Model 4200 Oscillator - Page 1
Forum section: electronics / testgear

author: sneily
author_rank: Contributor
timestamp: September 03, 2024, 09:12:20 pm
content: This Krohn-Hite model 4200 Oscillator had a blown resistor on the Attenuator PCB. The one resistor that blew, left a scorch mark on the pcb and took out two adjacent resistors. The original resistors are unobtainium but the power of parallel ohmage allows for "good enough" repair. (see pic)All electrolytic capacitors tested within spec and so none were replaced. The sine wave output is clean.Before returning this test instrument to the workbench, I restored the worn and missing lettering on the pushbuttons. I used dry transfer decals from the model train hobby.Now back to service!
DHO 900 series USB hub - Page 1
Forum section: electronics / testgear

author: Gadjet
author_rank: Contributor
timestamp: September 02, 2024, 06:21:46 pm
content: I have just bought a DHO914 scope and really like it so far but the lack of WiFi is a pain, I found the hacks to get it working with a WiFi dongle but I'd like to use a USB memory stick and possibly a mouse as well all at the same time.So I've designed a custom USB hub shaped for the DHO900 series that I hope will work with the logic analyser plugged in at the same time.Here is a picture of the case for the hub (the electronics are on order) and I was wondering if anyone who has the logic analyser module could give me an idea if you think it will still plug in with this USB hub fittedI have a design also for the DHO800 series that would cover the socket for the logic analyser.

author: ebastler
author_rank: Super Contributor
timestamp: September 02, 2024, 06:33:36 pm
content: Yes, it will fit -- the plug of the PLA2216 logic analyser is not wider than the cutout in the scope's front panel. It may be a bit of a fumble to pull the plugoutagain while the USB hub is installed, since you can't get a good grip. But you are not supposed to hot-plug (or unplug) the logic analyzer anyway.

author: Fungus
author_rank: Super Contributor
timestamp: September 02, 2024, 09:07:16 pm
content: Get the files over FTP once you have WiFi working.Buy a stylus instead of using a mouse.

author: Gadjet
author_rank: Contributor
timestamp: September 02, 2024, 09:45:51 pm
content: Quote from: Fungus on September 02, 2024, 09:07:16 pmThat would mean having the scope within arms reach
Spec for: Induced error from adjacent current-carrying conductor - Page 1
Forum section: electronics / testgear

author: quixotix
author_rank: Newbie
timestamp: September 05, 2024, 02:42:13 am
content: I just received my BM036 meter. I was reading the specs and came across the "Induced error from adjacent current-carrying conductor" for measurements made with the clamp. I'm guessing the BM036 has the same specs as the BM037 and BM035. The specs listed for this error for ACA are:<0.1A/A for BM037 & BM035<0.6A/A for BM033 & BM031The specs are shown here:https://www.eevblog.com/wp-content/uploads/2022/12/BM030_Catalog.pdfIt appears to me that this is saying the BM037 & BM035 can have up to an added 10% error from an adjacent conductor, and the BM033 & BM031 can have a rather large 60% error.Is this the correct interpretation? Most of the accuracies are given as percentages, making me wonder why this isn't listed as a percentage -- maybe I'm missing something? Note: I'm just a layperson that will use the meter in my garage, so I'm not really concerned. I'm just curious if my understanding is correct.
Black Star PVG1000  programmable video generator docs ? - Page 1
Forum section: electronics / testgear

author: zippysticks
author_rank: Newbie
timestamp: September 02, 2024, 02:31:13 pm
content: Hi folks - I have one of these and am having some intermittent challenges with it .Does anyone have a manual (user or service) for it please ?When I received it, there was some very minor NiCd battery leakage damage. I have cleaned this all up - mostly confined to the daughter board on which the battery sat.I'm currently waiting for a replacement NiMH battery and will check the small number of through hole via locations and reflow some of the solder connections.A manual would really helpThanks
GPSDO - Leo Bodnar 1420 vs. Precision GPS Reference Clock - Page 1
Forum section: electronics / testgear

author: W4PJB
author_rank: Regular Contributor
timestamp: September 04, 2024, 02:30:29 pm
content: I've been in the market for a GPSDO to use as an external clock and calibration tool for some RF test equipment. Last night I placed an order for a Leo Bodnar LBE-1420, partly based on some posts on this forum that seemed to give it high praises.I looked at their "Precision GPS Reference Clock", but for $100 more, I couldn't really see any advantage, at least not based on the website descriptions. They're both 1x10-12 accuracy, both use TCXO's, both have 3.3v output for active antennas, both produce a 50 ohm, 3.3v CMOS level square wave output. But the 1420 has a larger frequency range and lower phase noise. No reference of the Allan Deviation for the 1420.Other than adjustable output amplitude and ability to be powered by USB or a 5-12v adapter, what is the benefit of the "Precision GPS Reference Clock" over the LBE-1420?

author: J-R
author_rank: Super Contributor
timestamp: September 04, 2024, 09:20:18 pm
content: The LBE-1420 is a more recent release and essentially replaced the older single output product. The "Precision GPS Reference Clock" is also an older version, but dual output, although the second output is limited in some ways.The two older versions do have the four output drive currents available, while the new one doesn't have this feature.

author: EvgenyG
author_rank: Regular Contributor
timestamp: September 05, 2024, 12:18:13 am
content: They've recently released command line tools to control the device, and there is an option to not save the set frequency. Can use that to automate some of the tests.

author: W4PJB
author_rank: Regular Contributor
timestamp: September 05, 2024, 01:41:55 pm
content: Thanks all! I don't know how I missed the Precision GPS Reference Clock having two outputs. I guess I was just scanning the description for numbers. I certainly don't need dual output.The variable output levels could be helpful. The 1420 outputs 11dBm. I can't find specs for all of my equipment, but the maximum input on my 8566B, for example, is 10dBm. I've seen limits for some equipment as low as 0.8vpp so I think some attenuation is in order. I picked up a JFW step attenuator (0-30 in 1dBm steps) for $65, so that should cover any input requirement. Plus, now I own a nice step attenuator
Looking for manual for HP/Agilent 16340A RC Box - Page 1
Forum section: electronics / testgear

author: TERRA Operative
author_rank: Super Contributor
timestamp: September 01, 2024, 10:52:19 pm
content: I'm looking for a manual for the HP/Agilent 16340A RC box.It looks pretty simple to make, but I just want to check the details etc.Here's a link to xdevs with some nice photos showing the thing:https://xdevs.com/review/hp16340a/If anyone has this manual they can upload/scan/sell, please let me know!Thanks!
Crazy Cal station auction, whats it worth?  - Page 1
Forum section: electronics / testgear

author: Vertamps
author_rank: Contributor
timestamp: July 10, 2024, 05:47:10 pm
content: Id assume it goes for $30k+. Hopefully someone lucky gets it on the cheaper end. Im betting companies like Alltest are in the bid. Let us know if you mortgage the house orsell the GTO to buy this lot of joy. Scary though if you cannot verify function.5500A + 5700A calibrator, Fluke 732B, 742A-1Ω standard, 742A-10KΩ standard, HP3458Ahttps://www.bidspotter.com/en-us/auction-catalogues/maynards-usa/catalogue-id-bscmayn10266/lot-5fd210e3-a524-472b-a764-b1a20188c1dc

author: Pilatus
author_rank: Contributor
timestamp: July 10, 2024, 05:58:51 pm
content: bid price + 20% buyer's premium + 5% sales tax + crating cost + shipping costWondering what it will go for as well...

author: Vertamps
author_rank: Contributor
timestamp: July 10, 2024, 06:08:51 pm
content: A local company would charge $3000(up to $5k?) to crate this lot i think, based on only one quote i got on a much smaller lot. I was prepared to fly into Colorado from Detroit to pack and ship myself but the auction got silly. Im already over my head with my stuff.

author: Stray Electron
author_rank: Super Contributor
timestamp: July 10, 2024, 06:33:24 pm
content: Yeas ago a friend of mine bought out a complete commercial cal lab at a local industrial auction and I helped him haul all of it to his warehouse. Later we found thateverysingle piece of the TE was missing some critical Unobtainium bits inside! It seems that the "Cal Lab" had used all of it for parts and sold off all of their good equipment sometime earlier (if they even owned away!) and reserved all of theircrapfor the auction and my friend being rather greedy bought all of it at what hethoughtwas a good price!Personally, I won't buy anything that I can't see work, except for a scrap price. And I wouldn't buy any Cal Equipment that I couldn't see working and that I couldn't check the performance of it ahead of time. Just the added costs of the 20% premium, the sales tax and the shipping costs alone usually makes buying at online auctions prohibitively expensive IMO.

author: Smokey
author_rank: Super Contributor
timestamp: September 02, 2024, 09:02:56 am
content: Quote... the world will never know....
Teardown: Cami Research CableEye M3U Cable Tester - Page 1
Forum section: electronics / testgear

author: KG7AMV
author_rank: Frequent Contributor
timestamp: August 30, 2024, 03:32:28 am
content: Just did a quick video. I will be releasing the firmware backup attempt video soon. If anyone has a M3U whats your Firmware Version?

author: KG7AMV
author_rank: Frequent Contributor
timestamp: August 31, 2024, 09:52:03 am
content: The Firmware Backup Attempt Will be Public In the Aug 31 5 AM Pacific Time.
Hantek DSO5102P - why 2 frequencies? - Page 1
Forum section: electronics / testgear

author: SparkyNZ
author_rank: Newbie
timestamp: August 30, 2024, 08:36:13 pm
content: I have a Hantek DSO5102P. CH1 is connected to a 28.6MHz signal.Can somebody please explain why there are 2 frequencies shown? The yellow bar shows 29.58MHz and the blue CH1 frequency only shows 4.996kHz?I've had a look in the manualhttps://www.hantek.com/Product/5000P/DSO5000P_Manual.pdfbut I can't figure it out.Screenshot:

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2024, 08:48:56 pm
content: Pulse trigger, right ?Try a normal edge trigger and drive the scope yourself rather than let Autoset think it knows best.

author: SparkyNZ
author_rank: Newbie
timestamp: August 30, 2024, 08:51:48 pm
content: Quote from: tautech on August 30, 2024, 08:48:56 pmYeah you're right. I switched to rising edge and moved the trigger to about 80% of the peak and its now showing only 1 frequency.. and exactly what I expect it to be.Note to self: If silliness on the screen, forget Autoset. :-) Thank you

author: tautech
author_rank: Super Contributor
timestamp: August 30, 2024, 08:59:50 pm
content: Quote from: SparkyNZ on August 30, 2024, 08:51:48 pmGood work, we all learn a little each day........

author: SparkyNZ
author_rank: Newbie
timestamp: August 31, 2024, 01:03:13 am
content: Quote from: tautech on August 30, 2024, 08:59:50 pmAnd then forget more the next day :-)
Equipment with the craziest front panel.....  - Page 1
Forum section: electronics / testgear

author: Smokey
author_rank: Super Contributor
timestamp: August 24, 2024, 02:06:29 am
content: My vote is the ADVANTEST D3286 Pulse Pattern Generator/Error Detectorhttps://www.testequipmenthq.com/datasheets/ADVANTEST-D3286-Datasheet.pdf

author: dietert1
author_rank: Super Contributor
timestamp: August 24, 2024, 07:04:11 am
content: Your image tells only half of the story since it doesn't show the generator device. A working system has the D3186 and the D3286! And one might think the complete user interface is "on screen" but it isn't. There are lots of arrow keys to select modes..Regards, Dieter

author: AVGresponding
author_rank: Super Contributor
timestamp: August 24, 2024, 09:12:46 am
content: How about this bad boy, with over a kilovolt on the binding posts:

author: martin1959
author_rank: Contributor
timestamp: August 30, 2024, 04:46:13 am
content: When I was young I repurposed this nice front panel of what had been a "Liquid Scintillation Spectrometer" sporting dekatron tubes for numeric display.
Advantest R4131 Series Spectrum Analyser - Page 1
Forum section: electronics / testgear

author: Greenkit
author_rank: Newbie
timestamp: September 01, 2024, 10:13:02 pm
content: My R4131c has lost its baseline trace i.e.: no display of 'grass' or input signals. Numerical screen information of frequency tuned, span, etc is present and can be changed from the keys as normal. Sometimes the baseline appears at switch-on from cold, then freezes within a few seconds; in this condition the marker can be turned on and tuned along the baseline. Investigations so far indicate that this coincides with the 10V and -13.5V lines starting up properly on the YTO control/IF board: these lines require a full +15V from the PSU, a Fuji PTA 465, to get them going. There are no sub-rails present with a warm start.In my case both the + and -15V lines are low, at around 11.5V. The Fuji supply also generates +5.2V and +12V rails, which are within 0.1V of nominal. All rails are reasonably clean on a 'scope.Does anyone have a schematic of the PTA 465? There's nothing in the Advantest Operations manual. At 30 years old its electrolytics have probably seen better days, but I'm curious to know if this is a common fault in this series of SAs: restoring 'solid' supply rails may help, or am I looking at something worse / CPU related?Any experience gratefully received: thanks for taking time to read...