hybridfree/eevblog-posts huggingface dataset:
New handheld 2ch DSO, Mustool MDS120MC2, claimed 120MHz/500MSps (June 2024) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: June 11, 2024, 04:03:11 pm
content: Most of this info is from learnelectronics video below:- 120MHz single channel- 40MHz dual channel- equivalent max sampling rate 500MSps- looks like it uses MCX connectors- storage depth 12.8div (?)- vertical sensitivity 50mV-100V- time base 6nS-50S- trigger auto/normal/single, rising/falling edge- signal generator: sine/triangle 100kHz, square 3MHz, 0-3V- 320×240 2.4" display- 124×80×35mm, 187gAt Banggood for around US$80:https://www.banggood.com/MUSTOOL-2IN1-120MHZ-Dual-Channel-40MHZ+2-500MS-or-s-Handheld-Digital-Oscilloscope-+-Function-Signal-Generator-MDS120MC2-p-2011184.html?cur_warehouse=CNA short review by learnelectronics, he wasn't very impressed andthought it was a bit too expensive:https://youtu.be/JNNQ12k7EK8

author: tautech
author_rank: Super Contributor
timestamp: June 11, 2024, 07:56:15 pm
content: Quote from: tunk on June 11, 2024, 04:03:11 pmGood luck even resolving 10mV of ripple on a power rail with such poor max sensitivity.

author: tunk
author_rank: Super Contributor
timestamp: August 03, 2024, 03:58:09 pm
content: Also sold as the TOOLTOP ET120MC2, from around US$60:https://www.aliexpress.com/item/1005007156636269.html
Keithley 197 GPIB board schema - Page 1
Forum section: electronics / testgear

author: MiroS
author_rank: Regular Contributor
timestamp: August 01, 2024, 03:35:17 pm
content: Hi everyone,I am looking for schema of GPIB/488 board, model 1972-102-02D. Keithley 197 itself seems to work, but GPIB is dead cold.Thanks in advance!

author: coromonadalix
author_rank: Super Contributor
timestamp: August 01, 2024, 04:23:32 pm
content: may help a bithttps://w140.com/tekwiki/images/f/f5/Keithley_1973-901-01C.pdf62 pages, many links and dud on the web, no schematicssadly no schematics, but part numbersit refers to the classic 9914 ic so many designs floats on the web, normally comes with 2x line buffers ic'syou have on ebay at least 3 books of this interface, ask the sellers if they have schematics inside themgood luck

author: MiroS
author_rank: Regular Contributor
timestamp: August 02, 2024, 03:29:40 pm
content: Quote from: coromonadalix on August 01, 2024, 04:23:32 pmI repeired this board, relay had weak cntacts. No idea what for is this relay, but it is switching power on GPIB board side.I replaced it with random 5V relay and works now. I have no good replacement so it will fail again one dayThanks!

author: coromonadalix
author_rank: Super Contributor
timestamp: August 02, 2024, 04:40:56 pm
content: or may not loll

author: zrq
author_rank: Frequent Contributor
timestamp: August 02, 2024, 08:33:44 pm
content: Are you in Poland? I'm taking one of my Keithley 197s apart for parts and I can send you my 1972 GPIB board for little. There are many dying electrolytic capacitors in it so I consider it is beyond economical repair, and I already steal it's CPU to recover an K617.Just to cover the shipment from Switzerland (likely 9 euros) and maybe additional 10 euro to cover the bother to pack it up and for the trip to the post office.Nevermind, just realized that you managed to fix it. Hope it can be a permanent solution.
HP / Agilent Power Supply A2Interface PCA board schematic (processor Board) - Page 1
Forum section: electronics / testgear

author: Jester
author_rank: Frequent Contributor
timestamp: July 22, 2016, 02:29:52 am
content: It appears that Agilent uses the same basic processor board for many of their power supplies, I have seen the same board in the 6612C, 66309, and now a 6633B. The service manual provides pseudo schematics for the main power board, but not this interface board. It appears that I have a fault on this board, when I connect the flat ribbon cable between the A2 Interface PCA (processor board) and the A1 main power supply board one of the tantalum capacitors on the interface (processor) board gets really hot.I need a schematic of the A2 Interface PCA (processor board) to determine what's going on. Does anyone have or no where I can find the schematic for this board?Agilent part # is 5063-3429, or 5063-3439, however many other variations of this board for example for the 6611, 6612, 6613, 66309 etc will likely be close enough to allow me to determine what's gong on.

author: Jester
author_rank: Frequent Contributor
timestamp: July 24, 2016, 04:07:06 am
content: I was able to find the interface signals on a 66309 Schematic and that was enough to get me close enough to the problem. This power supply is now fixed and calibrated.

author: av500
author_rank: Contributor
timestamp: January 23, 2020, 08:36:39 am
content: Quote from: Jester on July 24, 2016, 04:07:06 amhi there, do you have 66309 schematics?

author: vaualbus
author_rank: Frequent Contributor
timestamp: August 02, 2024, 05:58:10 pm
content: Yeah good question, to my knowledge they were never been released?
Coax Cable Selection for HP 37203A HPIB Extender - Page 1
Forum section: electronics / testgear

author: ZGoode
author_rank: Frequent Contributor
timestamp: August 07, 2024, 02:38:57 am
content: Hi y'all,I'm trying to figure out what kind of coax cable to use for my pair of 37203A. The manual says to use coax with 75ohm impedance and a resistance of at most 4ohm/100m. The obvious choice seems like it would be RG6, and I was planning on just taking a 100ft antenna extension cable, but from what I could find is that most RG6 likely does not meet the resistance specification. What (cheaper) cable types should I be looking at here?

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 07, 2024, 02:48:41 am
content: The manual specifies Belden 9248 as the recommended cable; DCR is 6.4ohm/1000ft, so I assume it will work.

author: ZGoode
author_rank: Frequent Contributor
timestamp: August 07, 2024, 03:03:50 am
content: Oh, nice. I don't know how I missed that. What page did you see that on? The specs I was looking at were on page 3-2.

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 07, 2024, 03:08:05 am
content: Quote from: ZGoode on August 07, 2024, 03:03:50 amNote 2 below in Table 1-1 and 3-1.

author: stj
author_rank: Super Contributor
timestamp: August 07, 2024, 01:27:30 pm
content: check sattelite cable such as CT100the core conductor and air-space insulator are pretty much the same as RG6 but the outer shielding is much better.copper braid followed by copper foil.
BSIDE OT2, 1ch pocket DSO, claimed 10MHz (August 2024) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: August 01, 2024, 03:52:04 pm
content: - 10MHz, 48MSps- 20mV-10V/div- 100ns-20s/div- storage depth 128Kbyte- 2.8" screen, 320*240 pixels- size 108x70x33mm. weight 166g- battery 1800mAh- currently from US$36https://www.aliexpress.com/item/1005007369354185.html
Yokogawa 3292 Optical Power Meter manual wanted - Page 1
Forum section: electronics / testgear

author: flash2b
author_rank: Regular Contributor
timestamp: July 01, 2024, 09:34:52 am
content: Hi,I am looking van a Manual for the Yokogawa 3292 (or 3293) Optical Power Meter. I was disappointed that a big company like Yokogawa does not have an archive with manuals for old equipment.The meter is the one below:

author: flash2b
author_rank: Regular Contributor
timestamp: July 30, 2024, 11:28:19 am
content: Sad that no one has an manual, spec sheet or whatever.This is the error code the device produces

author: TERRA Operative
author_rank: Super Contributor
timestamp: August 01, 2024, 06:43:36 am
content: Yokogawa told me that they only have a Japanese manual for this instrument, so I've attached what they gave me below.If the instrument was sold outside Japan then you might get lucky one day, but until then you'll have to use Google Translate on your phone or something....

author: flash2b
author_rank: Regular Contributor
timestamp: August 01, 2024, 09:12:29 am
content: Well this is greatFinally some documentation to get myself started, thank you !

author: squadchannel
author_rank: Frequent Contributor
timestamp: August 01, 2024, 09:41:58 am
content: The manual says "Error 133 : REF RECALL mode error - not selected RELATIVE mode."I am glad it is not an error that needs to be repaired.
East Tester ET3240 - Page 1
Forum section: electronics / testgear

author: Ygor
author_rank: Newbie
timestamp: August 01, 2024, 01:55:38 am
content: Is my brand new multimeter defect, the dc reading is fluctuating. The HP is stable but not the 3240 reading a calibrator source ? HP 10.003v and the 3240 from 10.02 to 9.978v
What test instrument is BNC jumper the from? - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: July 31, 2024, 05:50:48 am
content: This BNC jumper came with many RF adapters & terminations from disassembled test racks. It looks like it was part a piece of test gear.The BNC centers are exactly 1.8" apart.A part number on on of the BNC connector is 28AU100-1The date code is 4991 which I assume means the 49th week of 1991.Do you have any idea what this is from?Thank you,Chris

author: MarkL
author_rank: Unknown
timestamp: July 31, 2024, 01:52:30 pm
content: Most commonly, these fit the REF OUT to REF IN BNCs on the back of HP/Agilent 859x spectrum analyzers. Their part number is 1250-1499.People remove these from equipment and sell them individually, which is irritating when buying the equipment. The all metal ones, like you have, sell for ridiculous prices.The complete list of equipment from Keysight Find-A-Part that use it:Quote

author: floobydust
author_rank: Super Contributor
timestamp: July 31, 2024, 04:47:03 pm
content: 28AU100-1 used in HP3588A Spectrum Analyzer (HP 1250-1499) COAX BNC(M) to COAX BNC(M)https://4gte.com/products/hp-agilent-1250-1499-adapter-coaxial-male-bnc-male-bnc/

author: coppercone2
author_rank: Super Contributor
timestamp: July 31, 2024, 07:44:53 pm
content: thats a nice connector, very stable. The newer ones I think are more modular with sliding contacts so you can adjust their spacing but IMO this one is nicer, its just really specific
Agilent "OEM" E3631A? - Page 1
Forum section: electronics / testgear

author: NickyDoes
author_rank: Contributor
timestamp: July 31, 2024, 05:35:51 pm
content: I found an Agilent E3631A triple output power supply locally. It has the "en_od_r mi_si_g puls_s" problem, but that's a simple fix. The display is bright, and the outputs put out. The only weird part is the model/serial decal lists the part number as E3631A OEM. Whazzup with that, and is there anything to be aware of or concerned about?The front panel looks like any other E3631A. I've attached pictures.
HP 4191A roms - Page 1
Forum section: electronics / testgear

author: fisafisa
author_rank: Regular Contributor
timestamp: July 29, 2024, 07:45:03 pm
content: Hi.I am in the process of trying to fix an old HP4191A.Somebody has been there before me.I will try to back up roms, but if somebody has done it before, I can then verify their content.Many thanksF
Information sought on GÖRL & RÖSSLE FC2 Frequency Calibrator - Page 1
Forum section: electronics / testgear

author: RBBVNL9
author_rank: Frequent Contributor
timestamp: July 29, 2024, 07:42:45 pm
content: Hello,Would anyone, by any chance, have information on the GÖRL & RÖSSLE FC2 Frequency Calibrator?Recently, someone gave me this unit, which apparently has a broken PSU, and it made me curious...Thanks!/ rudi
PEAK DCS75 PRO, virtual machine (windows) in VMware Fusion on OSX - Page 1
Forum section: electronics / testgear

author: MBN65
author_rank: Newbie
timestamp: June 02, 2023, 03:06:42 pm
content: Hi!I'm running VMware Fusion om my Mac and most tings work's but not my DCA75 Pro.The Atlas software can't detect the device.The device shows as "unknown device" in "device manager" in windows 11.Any one got this to work?

author: dibro
author_rank: Contributor
timestamp: June 02, 2023, 05:33:18 pm
content: I have also a DCS75 Pro and never got the software working under Linux-wine or in virtual-box with windows 7 and 10.Very disappointing.

author: tautech
author_rank: Super Contributor
timestamp: June 02, 2023, 08:26:39 pm
content: Quote from: magnus@brynhagen.com on June 02, 2023, 03:06:42 pmHave you asked Peak for help ?They are members here:https://www.eevblog.com/forum/profile/?u=84715You could also try their Support webpage or their tech assistance:https://www.peakelec.co.uk/acatalog/peak-product-support.htmltechnical@peakelec.co.uk2 minutes with Mr Google brings you these results.....

author: Paul Ed
author_rank: Contributor
timestamp: June 15, 2023, 02:17:18 pm
content: Hello Magnus, in short Yes! It does work:-Quote from: magnus@brynhagen.com on June 02, 2023, 03:06:42 pmAfter reading carefully the included User Guide (dca-pro-user-guide-en.pdf) and following it as closely as possible:- thus NOT plugging in the DCA-75 Pro until after all the VirtualMachine WIndows/.Net/USB drivers/etc. had been installed- ensuring the "Connect to Virtual Machine" when prompted by VMware Fusion after pluggin DCA-75 init all "just worked"Here are a few screenshots to show the install then the application running drawing nice curves...

author: MBN65
author_rank: Newbie
timestamp: June 30, 2023, 05:15:09 pm
content: Hi!Thank's for your tips.I think I have tried it just like this with no luck.Will try again.

author: neuhauser
author_rank: Newbie
timestamp: July 31, 2024, 11:48:45 pm
content: Hey guys. It was working on qemu and virtualbox. You had to bring up the transfer usb device in the virtual machine menu, plug in the peak, and select it from the menu within 5 seconds after it popped up to get it to transfer to the virtual machine. The last DCA firmware update seems to have broken the linux acp standards and won't allow it to be transferred. Gives timing and can't reset device errors in the linux acp logs.
JunTek PSG9080 Sweep Trigger Out ? - Page 1
Forum section: electronics / testgear

author: Pierre_Montreal
author_rank: Newbie
timestamp: September 08, 2023, 09:13:10 pm
content: If any of you have experience with JunTek PSG9080.I want to know if it is possible to generate a trigger pulse at the start of each sweep with this generator. I know the SYNC OUT at the back will generate a pulse at every zero crossing of the signal but not at the beginning I have check that.The reason is to get a frequency response curve on the oscilloscope.Thank you, bye.

author: radiolistener
author_rank: Super Contributor
timestamp: July 29, 2024, 01:40:51 am
content: No, there is no way to get sync pulse for sweep.SYNC OUT is to synchronize two generators.

author: Aldo22
author_rank: Super Contributor
timestamp: July 29, 2024, 09:07:58 am
content: I recently discovered that the TinySA can do this.Config -> More -> Pulse High.You can see this in the picture. The trigger point is at the blue arrow under the logo. Trigger source is external.That would be a cheap solution.Can you perhaps " abuse" the second channel of your PSG9080 for this?

author: Zenith
author_rank: Frequent Contributor
timestamp: July 29, 2024, 11:39:16 am
content: Maybe the JunTek can be made to do this. RTFM and use Google. I suspect it can't.My experience of this was with a FeelTech FY6800 (also sold under several other brands). It has a sweep function but no sync or gate output. This was something I found very irritating as one of the reasons I bought it was to use it as a sweep generator. It does have a VCO input. It has the peculiar sync output for synchronising other units.I found two ways of making it produce a synchronised sweep. I set up a five step staircase sweep, and made it slow enough that a frequency meter would have long enough to determine which frequency it was at, at each step.Use Channel 2 to produce a sweep voltage for the VCO and connect the Channel 2 output to the VCO with a BNC cable. This can be done, but the VCO isn't completely linear and you can't assume the start and end frequencies are what you would like then to be. It involves a specially set up sweep. Possible but painful and the sweep might have to be different for different ranges. If you are using it to check scope Y amps, you may not care if the sweep starts at 20kHz or 50kHz and ends at 19.5MHz or 20.5MHz. Maybe the Juntek doesn't have the problem with the VCO.Use Channel 2 to produce a sweep, the amplitude doesn't matter much, and use that to FM modulate Channel 1 using the parameter set up for Channel 1 modulation. Trigger the scope on the falling edge of the sweep from Channel 2. I found that worked very well and was convenient. You could also set up a scope in X-Y mode and use the sweep directly.Since then I've bought a Siglent function generator, and that has properly implemented sweep function with a sync output for the sweep. It works as expected with no messing about, but it's about twice the price of the Juntek.
HP 400EL AC voltmeter - Page 1
Forum section: electronics / testgear

author: carlos2007
author_rank: Newbie
timestamp: July 28, 2024, 10:27:37 am
content: Hello all,Recently I am in the process of making alignments in some HF receivers, Panasonic RF-2200, Drake R4B and SPR4, need to have the IF, mixers, premixers preamps and other RF parts been calibrated.I have already purchased a TinySA signal generator and a Sanwa multimeter in order to start but I have realizad that I had hidden in a cupboard and old HP 400EL AC voltmeter and I have some doubts in how to use it.VTVM is across voice coil in order to read the maximum output in the scale. Could I place the HP in the same configuration? Is it more accurate than the analog multimeter? One think that bother me is that I do not understand the range switch and display.Only works to 10Mhz or may it be used to 30 Mhz (shortwave bands)Any help and advice is greatly wellcome I am a bit lost about this device.Thanks in advance.

author: wn1fju
author_rank: Frequent Contributor
timestamp: July 29, 2024, 11:34:31 am
content: Meters like the HP400 series are particularly useful when trying to adjust things to peak a signal level. Much easier to see the peak than on a digital multimeter. Whether the HP400 is more accurate than your Sanwa, the answer is probably yes. Typically, HP analog meter accuracies are in the 1-2% range (of full scale).The meter is easy to use. Just set the range switch until you get a reading. The bottom scale is for the "3" ranges (0.3, 3, etc) and the middle scale is for the "1" ranges (0.1, 1, 10, etc.). The top scale is a decibel reading and is referenced to 600 ohms. In other words, about 0.773 volts through a 600 ohm load will give you a 0 dBm. You can pretty much ignore the top dBm scale if you like. The meter has a 10 Mohm input impedance and should be able to measure things without loading the circuit down.These meters don't have overlapping scales. By that I mean you will find there is only one range where you will get a valid reading. The other ranges will either move the needle all the way to the right or to the left.This is an average responding meter, not a "true RMS" meter. In other words, for any signal input more complicated than a sine wave, the readings may be incorrect. But again, if you are using the meter to make adjustments while peaking a signal, it is fine.
Triplett 630 made in USA - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: July 28, 2024, 01:07:15 pm
content: Since I have the Simpson 260 and 270. I recently get and old Triplett 310 and it's quite nice. I want to get a Triplett 630 but the current version is made in Taiwan. Which is the newest model 630 that was made in the USA?
Anritsu MS420K VNA Service Manual, or Perfomance Test? - Page 1
Forum section: electronics / testgear

author: cincin
author_rank: Regular Contributor
timestamp: July 27, 2024, 05:38:59 pm
content: Trying to fix an Anritsu MS420K VNA, and while I've found the User Manual online, the Performance Test section is missing. I also can't seem to find the Service Manual or schematics.Does anyone here have either? It would be immensely useful.Thank you!
Anybody here familiar with this Chinese USB oscilloscope? - Page 1
Forum section: electronics / testgear

author: Ben321
author_rank: Frequent Contributor
timestamp: July 26, 2024, 07:08:37 pm
content: One thing that caught my eye about thishttps://www.ebay.com/itm/125689810910is that it has a way to directly save to a file up to 4GB in size, and it has a sampling rate up to 25MHz for this signal recording mode. Now what it doesn't say on the eBay page is if this recording mode just records a sequence of blocks (each block having enough data for one screen of a waveform), or if it's a true stream recording mode (acts like a sound card line-in but at a much higher sample rate). The difference is that in block recording mode it would record a sequence of short blocks and miss any signal between blocks (it takes time for an oscilloscope to be re-triggered), while in stream recording mode it would constantly be recording the signal until it was stopped (essentially recording a single block of any arbitrary long size).Does anybody here know which recording mode is used by this oscilloscope when saving to a file in its "Data Recorder" mode? (Data Recorder is what it's called on the eBay page).

author: thm_w
author_rank: Super Contributor
timestamp: July 26, 2024, 08:44:58 pm
content: I'm sure its stream recording as you said its called "data recorder"http://english.instrustar.com/product_detail.asp?nid=1577There is also the dscope, but I don't think it can do continuoushttps://www.dreamsourcelab.com/product/dscope-series/The USBEE ax pro can do continuous, but analog not very goodhttps://lygte-info.dk/review/Equipment%20USBEE%20AX%20PRO%20Logic%20Analyzer%208%20channels%2024MHz%20UK.htmlAny USB DAQ will be able to do continuous.I suspect that device is not a great scope though.

author: TomKatt
author_rank: Frequent Contributor
timestamp: July 26, 2024, 09:27:02 pm
content: This thing looks like a $129 of disappointment to me… Whatever you’re trying to accomplish, I suspect there’s a much better solution.Edit - watched the video. Hilarious 😂Marketing companies should make this a case study to understand what makes this “scope” appealing to anyone - especially at that price.

author: jal1234
author_rank: Contributor
timestamp: July 27, 2024, 03:26:58 pm
content: You'll get better performance if using Hscope Android software with this scope. See the page below for Hscope verified specs when using that software. The experimental mode turns on 10-12bit capability in scopes with this chipset. "Automotive mode" gives you longer recording functions.Martin Loren, the creator of Hscope, is regularly improving Hscope adding more and more capabilities. He is on Telegram everyday, and interfaces regularly with his ever increasing user base. Hscope covers a variety of USB scopes, from Hantek, Loto, and many others.If you don't need a whole lot of bandwidth, look at his own scopes, the HS502 and HS512, 12 bits, and very low noise. They are sold on his website.https://www.martinloren.com/instrustar-isds205/
RuoShui VC71B (DMM/signal gen/thermocouple/current/voltage process calibrator) - Page 1
Forum section: electronics / testgear

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 26, 2024, 09:26:15 pm
content: Randomly stumbled across this thing:More here on AliExpress:https://www.aliexpress.com/item/1005007036399063.html?spm=a2g0o.home.0.0.650c76dbzOVSYF&mp=1#nav-descriptionWhat exactly is that thing? I can see it's a DMM (and a flashlight...) but what about the "signal gen / thermocouple / current / voltage process calibrator" part? Is this device used to calibrate other equipment? It can apparently simulate different types of thermocouples, has some form of signal generator and perhaps most interesting can serve as some kind of precise CC or CV source? What exactly is the difference between 'mA Source' and 'mA Simulate'? What is that 24V loop thing?

author: MAS3
author_rank: Regular Contributor
timestamp: July 26, 2024, 11:30:39 pm
content: It seems to be a very limited DMM, but also a calibrator for other equipment, which would be it's main function (hence it's name).Calibrators are supposed to be high precision devices, so you can rely on it.You'd have to question yourself what level of precision a $ 40 device would be (even if it's at it's normal price of almost $ 100).The "24 v loop thing" means it will supply (a hopefully reliable) 24 volts, and will measure the current your sensor sends, 0 - 20 mA is an industry standard, there's quite some sensors that can be set or have such an output.For it to function properly, you'd have to supply a (24 volts) power to that output, and for the measurement to function properly, your supply have to be reliable enough.So this calibrator can also be used to test said sensors without having to set up a supply.It's a bargain at that price, but "(0,2% + 4)" precision for most ranges doesn't impress me much for a calibration device.1 sold and no reviews doesn't help, OTOH it might be new to Aliexpress.

author: Rooster Cogburn
author_rank: Regular Contributor
timestamp: July 27, 2024, 12:29:16 am
content: Makes sense, thanks!Finally managed to find a manual:https://ueeshop.ly200-cdn.com/u_file/UPAY/UPAY087/file/products/2307/03/ec040f9542.pdfMight also be useful for injecting a voltage / current into a circuit for things like short finding etc. without having to use a precision bench PSU.

author: Poroit
author_rank: Frequent Contributor
timestamp: July 27, 2024, 06:39:13 am
content: This is a Process calibrator and mainly used by Instrument Techs for Souring or Sinking 4-20mA signals associated with Process Instrumentation.Heaps of different brands available with the most popular ones being Fluke,Beamex
ILX Lightwave LDT5910B - help with GPIB ICs - Page 1
Forum section: electronics / testgear

author: pshersby
author_rank: Newbie
timestamp: April 01, 2024, 04:46:38 pm
content: I've just done a reapir on one of these thermoelectric Temperature controllers. Video herehttps://youtu.be/elwUcfqSWdY?si=X5owFA6owSzTzzDb. I made a replacement linear Power supply board because I couldn't find a suitable replacement transformer. I'll try and get schematics and gerbers uploaded somewhere.BUT my problem is that my unit is missing the GPIB ICs, everything seems to be populated except three ICs in the corner and the DIL header to GPIB connector cable.Anyone know what the 3 ICs are please or could send me a photo of that corner of their board - sorry picture is not great, taken from video capture.Link to Github for Gerbers etc for those who might need themhttps://github.com/pshersby/ILX-LDT-5910B-PSU

author: coromonadalix
author_rank: Super Contributor
timestamp: April 02, 2024, 01:35:15 am
content: https://www.artisantg.com/info/ILX_LDT5910B_Manual.pdfno schematicscould be a Intel 8291 gpib talker listener and the other should be line drivers ?? stated in this manualor 8292 8293https://www.manualslib.com/manual/1932192/Ilx-Lightwave-Ldt-5910.html?page=43#manualhttps://w140.com/tekwiki/images/5/57/I8291A.pdfintel 8282 for the 20 pin ic?? or Intel 8282 is functionally identical to 74573 or 74373 octal latch, although the pinout differ slightly.

author: picburner
author_rank: Frequent Contributor
timestamp: April 02, 2024, 07:29:07 am
content: DIP-40: NAT9914 (TMS9914)DIP-20: SN75160BDIP-22 Wide: SN75162B

author: pshersby
author_rank: Newbie
timestamp: July 27, 2024, 05:20:11 pm
content: Thanks for the info, now just need to find them!
Pendulum | CNT-90 - TimeBase - Page 1
Forum section: electronics / testgear

author: liszt955
author_rank: Newbie
timestamp: July 23, 2024, 08:53:45 am
content: Hi guys!Recently, I've been changing the TimeBase of my second-hand CNT-90 by replacing it with an OCXO, and When calibrating with a GPSDO, I encountered the problem "Impossible to calibrate timebase. Bad reference signal?"I have followed the methods found online and have already changed the software options to option 30.I would like to ask everyone, what methods are there to solve this problem?By the way, how do I insert pictures? It's my first post.

author: coromonadalix
author_rank: Super Contributor
timestamp: July 23, 2024, 09:45:52 am
content: normally as a first do not double post, it is not appreciated, you already posted in the repair section, and the guy hasn't showed for 2 years there

author: liszt955
author_rank: Newbie
timestamp: July 23, 2024, 01:07:59 pm
content: I'm sorry.I tried to remove this topic,but it seems unsuccessful.I deeply apologize for the inconvenience caused.

author: liszt955
author_rank: Newbie
timestamp: July 24, 2024, 08:19:37 am
content: HI，guys:The issue has been resolved. I found a document for the Fluke PM6690. The key to this problem was that my OCXO, pin 2, Vref could not output voltage.However, during calibration, or when the OCXO is operating normally, Vref must output a 5V voltage. (Page 85 of the document)I added a variable resistor between pins 3, 2, and 5 of the OCXO to allow Vref to output a 5V voltage.When it can output 5V, I was able to correctly calibrate the time base.

author: liszt955
author_rank: Newbie
timestamp: July 25, 2024, 03:30:16 am
content: Because the document is too large, I will upload it in two parts. This is the second part of the document.
Zurich Instruments MFIA Impedance Analyzer (Z = 1mΩ - 1TΩ) Review & Teardown - Page 1
Forum section: electronics / testgear

author: Hugoneus
author_rank: Frequent Contributor
timestamp: July 24, 2024, 08:34:48 pm
content: You can watch the video here: [1 Hour & 2 Minutes]youtu.be/Q2kojqYr6F8In this episode Shahriar reviews the Zurich Instruments MFIA Impedance analyzer. The unit is capable of measuring impedances from 1mΩ to 1TΩ and across a frequency range of 1mHz to 5MHz while providing a basic accuracy of 0.05%. However, this instrument is much more than just an Impedance Analyzer, it is build on a lock-in amplifier architecture with sophisticated capabilities and features:https://www.zhinst.com/americas/en/products/mfia-impedance-analyzerThe review is organized as follows:00:00:00 - Introductions00:00:39 - Digital lock-in fundamental theory of operation00:06:00 - Block diagrams, LCR capabilities, performance metrics00:14:29 - MFIA I/O and interface overview00:15:48 - Detailed teardown, circuit components, design architecture00:21:57 - GUI introduction, software flow, API capabilities00:24:51 - MFITF Impedance Fixture details00:25:38 - Calibration & initial measurement setup, numeric display00:30:41 - Frequency sweep, self-resonance, plotting functions00:34:07 - High-Q filter measurements, phase & impedance analysis00:36:07 - Varactor CV characteristic measurements, bias & signal sweep00:39:32 - Trend sweeps, temperature measurements, statistical plots00:43:52 - Threshold Unit, generating waveforms, AUX IOs, DAQ capabilities00:49:18 - Lock-in amplifier overview & signal flow diagrams00:51:23 - Ultra-sound radar, spectrum view, digitizer, AUX routing01:00:48 - Zurich Instruments product ecosystem overview01:01:48 - Concluding remarks
LCR ET4410 - Calibration doesn't seem to work - Page 1
Forum section: electronics / testgear

author: MichaelB
author_rank: Newbie
timestamp: July 23, 2024, 08:59:47 pm
content: I hope I'm posting this in the right spot - I'm not too bright on these blogs...I purchased a new ET4410 from Banggood about 2 weeks ago. It seems to work fine (i.e. makes reasonable measurements) - but... I need help with the calibration. I'm following the manual's (4.7 Calibration) directions for a short calibration. I connect the Kelvin leads and Pres "CAL" to enter calibration - but, absolutely nothing happens. I don't get the "SHORT" picture that's in the manual and there is no countdown. I tried rebooting the machine - rinse/repeat - but still no calibration. Am I missing something? I thought it might be obvious and someone might have seen this before.Thanks!

author: Martin72
author_rank: Super Contributor
timestamp: July 23, 2024, 09:17:47 pm
content: Hi,With ET44/4510 it is as follows:If you want to do a short calibration, short-circuit the test lead and press the CAL button -and hold it downuntil the short cal message appears.A timer then runs backwards from 20 to zero.-If you want to do an Open Calibration, leave the test leads open and press the CAL button - and hold it down until the Open Cal message appears.

author: MichaelB
author_rank: Newbie
timestamp: July 23, 2024, 09:23:24 pm
content: YEP - you nailed it..." and hold it down" was NOT in the instructions, and that was the most important part! LOL. I had to hold it for about 3-5 seconds before it finally entered the CAL mode. I hope this helps someone else.Thanks!
Mini VNA Question - Page 1
Forum section: electronics / testgear

author: ko4nrbs
author_rank: Regular Contributor
timestamp: July 21, 2024, 11:16:59 pm
content: How was the resistance and reactance values determined from the Smith Chart -435m -j48.3m? What calculations are used to arrive at those values of resistance and reactance? It's my understanding that the VNA normalizes the resistance and reactance as displayed in the Smith Chart values.In addition, can the Smith Chart display units be changed. I have no idea what the m in -435m -j48m repesents.Thank you,Bill

author: shabaz
author_rank: Frequent Contributor
timestamp: July 22, 2024, 01:04:26 am
content: Hi Bill,(disclaimer: I'm a newcomer to NanoVNA, so please don't assume I know the best method for doing this)Please see the attached screenshots.In brief, the values you see on the display at the top are for four traces, all set to S11 in your case, and displayed in various formats.If you click onDisplay, you can click onTraceand choose the color of interest (for instance, green in your case, which is displaying the (-453m-j48.3) value). Make sure you don't accidentally gray it out, since that disables the display of it. You can simply tap it again to un-gray it.Then, click onBack, then selectFormat S11 (refl), then click on the textSmith. In my screenshot, it's defaulted to impedance(R+jX), not normalized. Yours will be different. You'll see a large selection; you can choose the one of interest.

author: ko4nrbs
author_rank: Regular Contributor
timestamp: July 22, 2024, 02:26:24 am
content: Thank you!!Bill

author: pdenisowski
author_rank: Super Contributor
timestamp: July 22, 2024, 10:55:49 am
content: Quote from: ko4nrbs on July 21, 2024, 11:16:59 pmI presume "m" stands for milli, so -435m - j48m would be the same as -0.435 - j0.048.Just a guess: we do this on some of our instruments (using "m" for "milli-")
Peaktech 4250 calibration - Page 1
Forum section: electronics / testgear

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 17, 2024, 07:38:07 am
content: Hi,has anyone tried to recalibrate the Peaktech 4250? It´s design is very similar to the Hantek CC-65, but not the same.Anyhow, it has67 trimmers, it would be perfect to know their function.My own unit is not so bad that I want to do "trial-and-error". It´s working quite good as a scope clamp up to 50kHz, I don't see any bad linearity or frequency response issues, it just always measures 8% too high in the low range.Thanks a lot in advance!

author: Tjuurko
author_rank: Regular Contributor
timestamp: July 19, 2024, 04:56:54 am
content: You need to look for a variable resistor, which is connected to the 10mA/mV switch.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 19, 2024, 07:45:35 am
content: Thanks a lot Tjuurko, you have made a simple current clamp very happy!These are the gain trimmers for 10x (10A/V) and 100x (100A/V). The 10x-trimmer seems not be independent of the 100x, so you have to calibrate 100x first.

author: J-R
author_rank: Super Contributor
timestamp: July 19, 2024, 09:43:03 pm
content: I found some information for the CA60 version of this. I am going to give it a whirl this weekend. But here is the gist of the procedure as I understand it:- Set clamp to 10mA/mV- Adjust VR7 for zero- set calibrator for 200mA DC and loop wire 5x through clamp (1A)- adjust VR6 for 100mV indicated on DMM- Set clamp to 100mA/mV- Set calibrator for 2A DC and loop wire 5x through clamp (10A)- Adjust VR2 for 100mV indicated on DMM- Set clamp back to 10mA/mV- Set calibrator for 200mA DC and loop wire 5x through clamp (1A)- Adjust VR1 for 100mV indicated on DMMI don't see anything about AC readings.

author: Phil1977
author_rank: Frequent Contributor
timestamp: July 22, 2024, 08:23:39 am
content: I did a few more tests with this device:First, linearity before and after calibration:It seems calibration is already off by 1% again after the weekend but all in all I think this more than okay for a clamp measurement. I do not have a Tektronix or Fluke available right now, else I´d love to compare.Then, I did a quick test about frequency response. It was done with a waveform generator feeding a 12Ohm-resistor and a scope measuring RMS on the resistor and RMS of the current clamp. The plotted value is the deviation of the measured current to the calculated current by Ohms law. Current level for this test was only around 60mA RMS because of the limit of the waveform generator.I wouldn't give the values over 100kHz to much confidence due to the setup. But it seems this clamp is quite okay to measure RMS up to 25kHz and resolve current spikes down to the microsecond range. I´m quite happy with this result.This frequency response shows that a separate AC calibration is not necessary. If you connect this clamp to a RMS multimeter, then the DMM cares about the "rectification". In the mains frequency range the deviation will be quite low.
Good voltage regulator tester? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: July 21, 2024, 11:43:05 pm
content: Is there a good, inexpensive voltage regulator tester? Most transistor regulators I want to test are from 5 to 18 volt.

author: Kim Christensen
author_rank: Super Contributor
timestamp: July 22, 2024, 03:22:37 am
content: Probably better to buy a power supply and an electronic load. Those would be useful for other tasks as well, as opposed to a dedicated regulator tester.

author: JoeyG
author_rank: Regular Contributor
timestamp: July 22, 2024, 04:57:40 am
content: You could look at a regulator data sheet like the classic LM7805 and see what parameters are critical for you and these theses.https://www.sparkfun.com/datasheets/Components/LM7805.pdfDatasheet used to give clues in the test method but now they don'.t

author: Messtechniker
author_rank: Frequent Contributor
timestamp: July 22, 2024, 06:15:50 am
content: Some time ago I rolled my own:

author: indman
author_rank: Super Contributor
timestamp: July 22, 2024, 06:31:40 am
content: Quote from: Axtman on July 21, 2024, 11:43:05 pmA transistor tester that has a high-voltage voltage source in its circuit for testing zener diodes can easily be converted into a voltage regulator tester. A photo of such a modification is below.
SIGLENT 3045 Remote EasyDMM Logging Issue? - Page 1
Forum section: electronics / testgear

author: sbeckert
author_rank: Newbie
timestamp: July 21, 2024, 05:12:55 pm
content: Wondering if anyone else has seen this remote logging issue using EasyDMM s/w?When collecting remote measurements using EasyDMM (USB or LAN) I've found that Manual sample rate settings (tried fast to very slow) return duplicate readings about every 5-15 readings. The time increment increases normally but the reading is idential to the previous reading. When I go to Auto mode, which samples about 5sa/sec, the problem seems to disappear.I've attached a pix what a clean sine wave input to the DMM produces when using Manual sampling in EasyDMM.Anyone else seen this?Thanks - Scott

author: KungFuJosh
author_rank: Super Contributor
timestamp: July 21, 2024, 06:02:47 pm
content: I don't like EasyDMM. You should check out TestController which is free and made by a member of this site.https://lygte-info.dk/project/TestControllerIntro%20UK.htmlThere's a small learning curve, but it's far superior to EasyDMM.

author: sbeckert
author_rank: Newbie
timestamp: July 21, 2024, 09:51:32 pm
content: Thanks - I'll take a look at it. Scott
Agilent 1690A self test failures - Page 1
Forum section: electronics / testgear

author: davidshoe
author_rank: Newbie
timestamp: July 22, 2024, 01:56:11 am
content: Just picked up a 1690A and running self test I am getting two sets of failures (excerpts of the logs below, full logs attached). Any suggestions on where to start trying to track the issues down? All the other self tests pass fine.Comparators Test running...Comparator Check Chip0 - Cal Clock No Activity Passed!Comparator Check Chip1 - Cal Clock No Activity Passed!Comparator Check Chip2 - Cal Clock No Activity Passed!Comparator Check Chip3 - Cal Clock No Activity Passed!Comparator Check Chip0 - Cal Clock Levels Failed !Pod1 expected: 0xffff, actual: 0x0000Bonus Bits expected: 0x0001, actual: 0x0000Comparator Check Chip1 - Cal Clock Levels Passed!Comparator Check Chip2 - Cal Clock Levels Passed!Comparator Check Chip3 - Cal Clock Levels Passed!Comparator Check Chip0 - Cal Clock Activity Failed !The LA Chip Calibrations test:LA Chip Calibrations Test running...-- Timing Mode Calibration --Testing Delay CalMeasure Delay Cal Failed on Chips: 0 1 2 3One Shots CalOne Shot Cal Failed on Chips: 0 1 2 3Testing Clocks CalTesting PSync Delay CalPsync Delay Cal Failed on Chips: 0 1 2 3Testing Data Delay CalData Delay Cal Failed on Chips: 0 1 2 3Testing Memory Clock Delay CalChip 0: TIMING Mode Chip Calibration Failed!Chip 1: TIMING Mode Chip Calibration Failed!Chip 2: TIMING Mode Chip Calibration Failed!Chip 3: TIMING Mode Chip Calibration Failed!
TDS3034C does it have a clock/ram battery? - Page 1
Forum section: electronics / testgear

author: PwrElectronics
author_rank: Regular Contributor
timestamp: July 19, 2024, 03:20:27 pm
content: Recently got a used TDS3034C that was in unknown working condition. Seems to work so far. Does it have a clock/ram battery that should be changed out as preventative maintenance? I have read the earlier versions have one of those Dallas clock chips in them. Well aware of those from old PC's...

author: PwrElectronics
author_rank: Regular Contributor
timestamp: July 21, 2024, 02:11:41 pm
content: Ok, answered my question.This does have a Dallas DS1742W-150 in it.I actually acquired 2 of these. One seemed to work fine. One had obvious damage, the BNC and ground stud on the back were bent sideways and things rattled a little. Drop damage likely. I powered it up and got a white screen. Elected to take that one apart to investigate.The sheet metal was bent up inside around those 2 protruding items. Easy enough to straighten. The rattling was some broken off plastic bits. Also noticed the shield over the inputs was dislodged a little and had to be snapped back in place. But, the root cause of the white screen seems to have been a ribbon cable between the power supply board and main board was popped off. On reassembly, made sure everything was in place. It now boots up and seems to be working.
N9020A MXA programming Python - Page 1
Forum section: electronics / testgear

author: Yrrah
author_rank: Contributor
timestamp: July 19, 2024, 09:24:37 am
content: I am writing some small scripts to control the N9020A signal analyzer. Basically as a learning experience, when needed for "serious work" I will use the scripts as a starting point. The Spectrum Analysis and Phase Noise modes are well defined. The Noise Figure mode quite less so. I have the N9020A programming manual (abt 3300 pages) but it does not really cover the Noise Figure mode. In particular I can not find the correct commands to load the CAL/MEAS ENR tables from MMEM. I can operate the SA manually of course but that does not really give a clue how to program the instrument. Is anyone familiar with the NF mode and is there a programming manual available that I have not found (on Keysight's website)?Thanks in advance,Harke, PA0HRK

author: d3
author_rank: Newbie
timestamp: July 20, 2024, 04:37:12 am
content: Some of the advanced measurement personalities have their own programming and users manuals, I've linked ones that I bet will have the commands you are looking for. It's for a newer version of the software no doubt, but they maintain pretty good backwards compatibility on the commands and I bet most of these work.PDF version:https://www.keysight.com/us/en/assets/9018-01844/user-manuals/9018-01844.pdfOnline version:https://helpfiles.keysight.com/csg/NFIGUREMode/FlexUI.htm

author: Yrrah
author_rank: Contributor
timestamp: July 20, 2024, 08:21:37 am
content: Thank you so much! That was exactly what I was looking for.Best regards,Harke
Agilent U1272a strange zero readings in AC measurement mode - Page 1
Forum section: electronics / testgear

author: Yuriy V.
author_rank: Contributor
timestamp: July 22, 2024, 04:44:24 pm
content: Agilent U1272a strange zero readings in AC measurement mode. And the same for AC voltage modes.Has anyone encountered such a problem?

author: coromonadalix
author_rank: Super Contributor
timestamp: July 22, 2024, 04:52:14 pm
content: with leads disconneted, if so they act as antenna and pick anything in the air, induction etc ...if you remove them is the meter show less ...some brands will force a zero value ...the fluke and amprobe i have at my job don't show zero value, disconnected leadsnothing to worries about

author: Yuriy V.
author_rank: Contributor
timestamp: July 24, 2024, 04:53:50 pm
content: Quote from: coromonadalix on July 22, 2024, 04:52:14 pmThe same figures with connected, shorted and disconnected leads (AC currentmodes). And this worries me.

author: wraper
author_rank: Unknown
timestamp: July 24, 2024, 05:02:49 pm
content: True RMS converters (with rare complicated exceptions like in 34461A/65A/70A bench meter) do not properly go down to 0. True RMS meters that show zero in AC mode actually fake it by displaying zero instead of readings below certain level.

author: electr_peter
author_rank: Unknown
timestamp: July 24, 2024, 05:05:50 pm
content: That's normal, this was discussed on this forum before.
Teardown: Cami Research CableEye M2 Cable Tester  - Page 1
Forum section: electronics / testgear

author: KG7AMV
author_rank: Frequent Contributor
timestamp: July 19, 2024, 11:29:29 pm
content: I got this old unit for testing some basic cables.Took a few tries with different USB to Serial converters but found one that software works with full speed. If anyone has the version 5.5 or later software let me know.Anyways here is the teardown.