hybridfree/eevblog-posts huggingface dataset:
Looking for Toellner 8851 PSU Manual - Page 1
Forum section: electronics / testgear

author: LADmachining
author_rank: Contributor
timestamp: January 27, 2021, 02:05:20 pm
content: Good Afternoon all,I am looking for a user manual for a Toellner 8851 power supply, prefereably in PDF format if such a thing exists. Usual web searches come up blank, and contacting the manufacturer has not even met with a response.Any help appreciated.Thanks,Anthony

author: larsdenmark
author_rank: Regular Contributor
timestamp: January 27, 2021, 04:45:49 pm
content: This page:https://www.wellenkino.de/manuals/says they have a printed copy of the manual (BDA = Bedienungsanleitung = User's manual)

author: doktor pyta
author_rank: Frequent Contributor
timestamp: January 27, 2021, 05:20:45 pm
content: I own 8435 power supply.The common issue of Toellner PSU is dry cap ~10uF in the voltage doubler which generates auxiliary negative voltage.It is located on a separate board on the back of the unit.There is a schematic of the similar model somewhere in the internet. It is useful, because Toellner use similar circuit in other PSUs.https://blog.alexander-tuxen.de/index.php/2014/10/10/toellner-lab-bench-psu-repair/

author: doktor pyta
author_rank: Frequent Contributor
timestamp: January 28, 2021, 06:01:18 pm
content: Lot of info and schematics under this forum:https://www.mikrocontroller.net/topic/503607C29 is a common failure point.
Yihua 8786D i - Page 1
Forum section: electronics / testgear

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: January 27, 2021, 08:02:16 pm
content: Hello, in my country there is an offer for the yihua 8786d welding station, I would like to know what opinion you have of this equipment? It is for hobby use.

author: retiredfeline
author_rank: Frequent Contributor
timestamp: January 27, 2021, 11:57:59 pm
content: I've got one. I've used the hot air gun for rework a few times and the soldering iron a few times with a chisel tip (I have a 936 knockoff with a conical tip for most work). Seems to work ok, no complaints. I'm just a hobbyist too.

author: BrokenYugo
author_rank: Super Contributor
timestamp: January 28, 2021, 03:59:22 am
content: I can't comment on the specific model or cheap hot air stations in general but Yihua is an ok brand, an actual manufacturer so a tier above the super cheap no name ebay stuff with missing ground connections and whatnot. I have a older 939D station that's been great for the occasional hobby use it sees. Only real problem is the usual problem with the Hakko 936 style clones (likely including the model in question), heaters tend to run smaller than a real Hakko and the cheap tips run larger than real Hakko tips, the loose fit leads to reduced performance on larger joints. This can be solved by buying legit Hakko tips though (start with the cheap assortment to find what shapes you find most useful), or do what I do and run a big knife tip and/or crank the temperature up for the occasional big joint that needs the extra energy.

author: TheNewLab
author_rank: Frequent Contributor
timestamp: January 28, 2021, 05:54:19 am
content: I have two dif models. I'm OK with it.There is a YT on how to add a power on light in case you're someone like me who keeps worrying if I turned it off. Plus another to repair and isolate the ground.I am really trying to keep this as a weekend hobby. Seriously, so Frckin' addictive!!

author: Adrian_Arg.
author_rank: Frequent Contributor
timestamp: January 28, 2021, 12:44:12 pm
content: Thank you all for your contribution, I liked it because it takes up little space, when placing the heat gun on its base it turns off, the same happens with the soldering iron after 10 minutes and they improved the PID system
HP34401A - Need a US/Wyoming cal lab recommendation - Page 1
Forum section: electronics / testgear

author: casterle
author_rank: Regular Contributor
timestamp: January 28, 2021, 12:59:27 am
content: I've got an old HP34401A that literally hasn't been calibrated since I bought in back in the mid-90's. I'd like to fix that so I have a trustworthy reference instrument I can use to judge the quality of the too-cheap-to-be-true Chinese items I seemingly can't resist.I live in Casper, Wyoming, USA, so I don't expect to find a lab within driving range, but do hope to find a reliable yet inexpensive lab close enough that shipping won't cost an arm and a leg.Thanks in advance, and stay healthy!

author: cruff
author_rank: Regular Contributor
timestamp: January 28, 2021, 01:05:27 am
content: There is a TransCat location in Aurora, CO. I used them to calibrate my 3468A, which had lost its cal memory due to a dead battery, last year.
Converting HP8566A to 8566B - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: January 27, 2021, 02:32:35 am
content: I will be getting an HP8566A shortly and I have a lot of HP8568B already.I know there was an 8566A to B conversion kit that mostly consisted of CPU board that used MC68K rather than HP's own calculator CPU. Does anyone have more information than this? Can I for example, take 8568B CPU board, somehow get the 8566B PROM image, replace it, and use it on 8566A to make it a B? What else was involved?There's almost no information that I can find on Internet except for brief description and existence of such a kit.

author: tkamiya
author_rank: Super Contributor
timestamp: January 27, 2021, 05:20:15 am
content: Information was made available to me via PM. Case closed!

author: dxl
author_rank: Regular Contributor
timestamp: January 27, 2021, 07:40:19 am
content: Hmm, is this information secret? I would appreciate if people would post that public as some people (like me) are also interested :-)

author: tkamiya
author_rank: Super Contributor
timestamp: January 27, 2021, 06:06:47 pm
content: I am sorry. I am not at liberty to override the wishes of person provided me with the information. There must be a reason he didn't want to publish it openly. That, we must respect.

author: tkamiya
author_rank: Super Contributor
timestamp: January 28, 2021, 12:58:13 am
content: DXL,Here is what was said in private mail in a nutshell. I have a permission from the originator to share. As I thought, he has his reasons to not get directly involved. So I'm going to rephrase this a bit:On 8568A, it is simple as replacing a card. On 8566A; unfortunately, it will involves more work. Replacing a card and changing some passive components. It's all explained on this PDF.https://www.keysight.com/upload/cmc_upload/All/08566-90151.pdfBy going from A to B, GPIB speed is improved and functions are added (mostly in GPIB) New card uses 680000 CPU.From me:By the way.... extensive re-calibration is required after performing these changes. That is, assuming, you want and need factory fresh performance. Most second hand 8568 (I have more than a dozen) are way off. You can quickly try to use 10Hz bandwidth. (not video bandwidth) Most used ones won't work well at this setup. I have one set that was professionally calibrated. It works perfectly. Calibration is rather involved on these machines. (not cheap to have it done either!) This is just one example. It should kind of sort of work without recal. Often, that's all we need....I will be glad to help if I can.
HP E1740A time interval analyzer - Page 1
Forum section: electronics / testgear

author: davorin
author_rank: Unknown
timestamp: October 31, 2015, 02:51:30 pm
content: I just stumbled upon this VXI card as I read a time interval analyzer selection guide from HP.Can this card also be used to measure precisely a 1Hz clock source and determine the +/- deviation in seconds per year?

author: Vgkid
author_rank: Super Contributor
timestamp: October 31, 2015, 03:33:36 pm
content: It is funny you mentioned this module, i was reading the time-nuts post about it. The lack of software tends to make them unuseable.

author: davorin
author_rank: Unknown
timestamp: October 31, 2015, 03:36:44 pm
content: Where did you read this?Yes..the E1741A/42A/43A seems to be nowhere available...but I assume it just reads out data via GPIB and does some funny things to it (o;Well the card is around a quarter of a 5372A in costs and wouldn't occupy shelf space when I already decided on VXI main frame.

author: HighPrecision
author_rank: Unknown
timestamp: February 28, 2016, 04:38:34 pm
content: Quote from: Vgkid on October 31, 2015, 03:33:36 pmI've reinstalled the software of a E1725B from scratch. Some years back I got bad sectors on HD of the embedded PC (EPC-7) and unfortunately the system VXI drivers, libraries and software was lost, after some hard research on the web I was able to reinstall and configure the full system (on win95/98)HP

author: davorin
author_rank: Unknown
timestamp: August 05, 2016, 10:44:43 am
content: Kinda old reply..I know (o;But finally found a cheap E1740A card to play with...Do you have apointer of the software you could restore your system?Hmm...I still don't know what's the minimum frequency it can measure...like measuring a 1Hz signal for deviation...

author: HighPrecision
author_rank: Unknown
timestamp: August 05, 2016, 05:46:33 pm
content: Quote from: davorin on August 05, 2016, 10:44:43 amFor Win95/98 VXI EPConnect software/drivers (Radsys EPC-7 embedded PC):ftp://ftp.keysight.com/mpusup/vxi/epcon95/and the measurement packages:http://www.leapsecond.com/museum/e1725a/E1747A is the same as E1741A with the option 'Timing Pattern Analysis'.E1725A system use an external PC connected to E1406A VXI GPIB controller module and E1740A TI counter, see this document (chapter 2):www.keysight.com/main/redirector.jspx?action=doc&lc=ita&cc=IT&id=1000004506%3Aepsg%3Adow&ltype=External%20Filein chapter 3 is described a system with embedded PC as my unit (E1725B), I'm not sure if epcon95.exe is valid also for external PC system.Quote from: davorin on August 05, 2016, 10:44:43 amE1740A specifications (page 17-2 of User's Manual E1740-90005) clearly describe maximum sequential TI of 26.2mS (~38Hz), also see page 7-3 and table 7-1.http://literature.cdn.keysight.com/litweb/pdf/E1740-90005.pdf

author: nikodem
author_rank: Regular Contributor
timestamp: January 27, 2021, 10:20:40 pm
content: Hi!Sorry for the post necromancy / archeology.Did you had any luck with the card? I have a chance to obtain this card with the intention to precisely measure some short periods of time (for Time Correlated Single Photon Counting - TCSPC).
[SOLVED] How to start Brymen BM869s in serial mode? - Page 1
Forum section: electronics / testgear

author: JarnoKai
author_rank: Newbie
timestamp: January 27, 2021, 08:19:03 am
content: How do you start the brymen bm869s in serial mode?Mine just arrived yesterday and I am trying to test out a custom USB cable for it, but I have been scouring the internet for about an hour to find the button combination that enables it, with absolutely no luck.I already found dozens of forum posts and articles about custom cables, protocol sniffing, sigrok problems but absolutely nothing seems to mention the button to turn it on!Is it always on? I see that the BM251 needs you to press the "hold" button while turning the meter on - for me this simply freezes the screen until I let go of it, just like Rec and Crest. The other three buttons activate their own functions (APO, Beep, weird diagnostic code)

author: 2N3055
author_rank: Super Contributor
timestamp: January 27, 2021, 08:51:14 am
content: There is nothing to do on the meter. Plug in the original cable, start the software from Brymen and it works.It is not a serial protocol, it is USB device, there is no serial port emulation...For custom cables and custom converters you need to follow it's instructions..
HP33120A option 001 phase lock on a pair of FGs - Page 1
Forum section: electronics / testgear

author: time27
author_rank: Contributor
timestamp: January 27, 2021, 04:28:55 am
content: Hi;I have 2 HP33120A with option 001.I tried to obtain Phase lock as described in "To Phase lock using a trigger burst mode".Unable to get a stable Phase lock - signal Phase drifts so much so that is one provides a oscilloscope plot of ch1 v ch2 the figure produced drifts from a Pi/4 line to a full circle - if same frequency is set on both FN generators.Do I have a faulty opt 001 board?normal operation of 33120A is ok ( frequency set on each unit - oscilloscope shows good signal shape )//Nick
anyone tried the dreamsource labs u3 pro 16? - Page 1
Forum section: electronics / testgear

author: psxpetey1
author_rank: Regular Contributor
timestamp: January 26, 2021, 11:09:59 pm
content: This product seems ok for my uses I need 14-16 lines currently however it only comes with 16 clips, do I need to buy more to use the full range of connectors because their will be grounds etc? Product reviews are vague and there are not many youtube videos on this device any advice would rock. I'm trying to use it to decode commands going to and from a 48pin tsop nand datasheet here:https://datasheetspdf.com/pdf-file/607807/Samsung/K9HAG08U1M/1.A few members of sigrock said I may need to write my own python for that but I may be able to get started with parallel or something. So What all do I need to use the device to its fullest potential and to work when it hits my doorstep and also do you recommend. I using a nand socket:https://www.ebay.ca/itm/1PCS-TSOP48-TSOP-48-Socket-For-Programmer-NAND-FLASH-IC-NEW-S/182395938731?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649so leads will be easy to connect.
siglent sds1104x_e - Page 1
Forum section: electronics / testgear

author: peter2
author_rank: Contributor
timestamp: January 24, 2021, 03:14:24 pm
content: hello,iam new here,i have a sds1104x-e ,and have it on the pro mode,(factory).is it possible to get it out ?i want to search for the license keys on the memorydump.bin file.Please help me for thisiam new beginner

author: thaistatos
author_rank: Contributor
timestamp: January 26, 2021, 08:38:16 am
content: https://www.eevblog.com/forum/testgear/unlocking-siglent-sds1104x-e-step-by-step/
MHS-5200A function generator command line utility - Page 1
Forum section: electronics / testgear

author: peters
author_rank: Newbie
timestamp: January 26, 2021, 04:56:18 am
content: If you have a MHS-5200A function generator and are sick of the terrible controls or do't use Windows, I have written a small command line utility that allows remote control of most functions and parameters from your computer. You can find it on githubhttps://github.com/peterska/go-mhs5200a
Upgrading HP53132A from medium to high stability OCXO. - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: November 07, 2020, 05:01:20 am
content: I have an HP53132A with a medium OCXO option. Since the board itself is the same from high and ultra-high stability options, I removed the medium oscillator and plugged in 10811-60111.Looking at schematic though, I found something odd.Pin 14 which is a heater power input is fed by 12V. According to manual, this is supposed to require 20 to 30 volt. I measured it and surely, 12V is present. Is there something I'm missing?Also, there is a jumper J2. A shorting plug was there from medium oscillator. Retrofit manual says to plugin a cable from power supply IF EXISTS. Mine doesn't have such cable. Looking at schematic, this shorting plug makes ground connection for the heater. Obviously, it is necessary. As far as I know, heater on HP53132A is always on, thus fan is always on. Is there a historical reason for this connection?Finally, OVEN stable signal is pin 11 on 11801. On oscillator board side, this is unconnected. Typically, there is a "OVEN" warning sign on most HP equipment. There is no such indicator on 53132A. How odd....Can anyone shed any light on these?

author: tkamiya
author_rank: Super Contributor
timestamp: November 07, 2020, 05:09:16 am
content: I found out HP53132A used 11801-60160 which heater spec calls for 12 to 30V.... that's why for 12V heater voltage. Rest of the stuff still doesn't make sense though.

author: tkamiya
author_rank: Super Contributor
timestamp: January 26, 2021, 02:57:52 am
content: Responding to my own old thread....I went ahead and removed the medium OCXO, and plugged in an ordinary 11801-60111, then set the jumper accordingly.Although this is an ordinary 20 to 30V oven piece, it works just fine. It took a while to fully heat up. It has been stable for a couple of days now. It may be that in extreme temperature, it cannot keep up with the ambient, but I am in air conditioned room. I see no issues.
Test equipment that supports an external 10 MHz reference-and adding them.  - Page 1
Forum section: electronics / testgear

author: cdev
author_rank: Super Contributor
timestamp: January 25, 2021, 09:37:29 pm
content: Has anybody ever compiled a list of1. hardware that accepts a known good external 10 MHz oscillator /frequency standard, or2. general modification techniques to add one.I vaguely remember a list having been compiled here at some point, but can't find it.Ahh.. here it is..https://www.eevblog.com/forum/testgear/list-of-test-equipment-with-external-10mhz-reference/
Selecting an LCR meter to measure PCB traces - Page 1
Forum section: electronics / testgear

author: kuon
author_rank: Regular Contributor
timestamp: January 25, 2021, 07:22:26 pm
content: Hello,I am working on a project that will use capacitance sensor and I need to measure my PCBs trace capacitance for calibration.Do you have recommendation on a LCR meter for this kind of job? Most LCR meter I find have big aligator clips which is not very practical.I also don't know if I need "high end" test equipment (keysight bench top LCR meter) or if there are some possible lower cost alternative.So I guess my question is twofold:- What kind of test equipement is best suited for this? Any LCR recommendation?- I would love a fixture that can hold the probe for me (also for other uses, like when scoping), maybe some X/Y table.

author: bob91343
author_rank: Super Contributor
timestamp: January 25, 2021, 07:28:01 pm
content: Sometimes I use a clamp, adjustable, to hold a test probe to the board. They are cheap, around a dollar. Best to measure at more than one frequency to make sure you aren't seeing a resonance.

author: nctnico
author_rank: Super Contributor
timestamp: January 25, 2021, 07:33:39 pm
content: The cheap XJW01 digital bridge (look on Aliexpress or Ebay) works fine for this purpose. You might want to make special probes/cables though to make sure you measure the PCB traces and nothing else.

author: kuon
author_rank: Regular Contributor
timestamp: January 25, 2021, 07:52:15 pm
content: On my current PCB, the exposed pads are 0.3mm x 1mm so I need something quite precise to adjust and ensure a good contact.I was thinking on investing on some fixture to holds probes, with X/Y/Z wheels to adjust it precisely, but except insanely expensive lab thing I cannot find anything. I guess I could build one with some 3d printer parts (leadscrew, profiles...) which are cheap now, but if I can find something assembled I would gain some times.
R&S RTO1000 Mainboard Flash error - Page 1
Forum section: electronics / testgear

author: TRN
author_rank: Unknown
timestamp: January 22, 2021, 09:16:20 pm
content: Yesterday my RTO1024 threw a spanner in the works, and now gives me the following error messages:Error reading Mainboard configuration file, switching to Service ModeError reading ANT-TRG configuration file, switching to Service ModeLooking at the Mainboard information tab, I noticed that the Material number, Serial and Product Index number do not contain any data.So I checked the Mainboard config.ini file, which is O.K, and contains the correct Material number, Serial and Product Index number information.Next I flashed the mainboard EEPROM which terminated correctly, but after reboot the same error messages popped-up.So I flashed the mainboard CxC, and this one does not terminate and appears to lockup, with as only possible solution to reboot the RTO.After this I flashed the mainboard CxC Fallback, which halfway through the process terminates, and initiates a reboot.I also re-flashed the FPGA which terminates correctly, however does not resolve the issue.Has anybody else ever had this problem, and give me any clues as how to fix this?Thanks

author: TRN
author_rank: Unknown
timestamp: January 28, 2021, 04:02:13 pm
content: I found the problem.The mainboard config.ini file had somehow lost part of it's information, and the ANT.ini file was completely missing.reinstalling those files, in the \EEPROM\Mainboard\ folder, and re-flashing the mainboard EEPROM, fixed the issue.
856XE memory module card format - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: January 21, 2021, 08:29:33 pm
content: Look like a PCMCIA, but it has card edge fingers under a retractable shield.So not a PCMCIA, also much thinner than a type 1.Any one has an idea on the format name, adapter to something that can adapt to something modern, etc etc ?

author: kirill_ka
author_rank: Frequent Contributor
timestamp: January 24, 2021, 09:42:13 pm
content: It's a SRAM card. It contains some static memory and a battery. That's it.HP48gx calculators used the same type of cards.Advanced users of HP48g calculators used to solder SRAM chips instead of the cards.http://www.finetune.co.jp/~lyuka/interests/calc/hp48g/hp48g-ram256k-sch.pngSo the picture above essentially shows the card schematics (red color).Obviously replacing SRAM with ROM makes the card read-only (= ROM card).

author: tchiwam
author_rank: Regular Contributor
timestamp: January 25, 2021, 02:33:43 am
content: Thank you for the schematic, so all in all I could cannibalize an hp48g (get scolded for it) and read it from my eprom programmer or something to that effect...No other less destructive manner to get the data out ?

author: kirill_ka
author_rank: Frequent Contributor
timestamp: January 25, 2021, 06:51:12 am
content: Quote from: tchiwam on January 25, 2021, 02:33:43 amSo you just want to get the data out? If I got you right, the HP48g won't work. It doesn't have the connector.Then you need 48gx. But I think 85620A would be a better option as a connector source.If you do have an HP856XE, you can read the card using the GPIB interface.https://www.eevblog.com/forum/testgear/hp856xe-hackers-corner/Also in theory* it's possible to read both the 85620A and the card by connecting a parallel programmer to the 85620A's bus interface.* This may not work with of the shelf software as you'll need to configure address multiplexers in the 85620A.
Agilent E5062A ENA Network Analyzer - Page 1
Forum section: electronics / testgear

author: Marcel G
author_rank: Contributor
timestamp: August 02, 2020, 04:01:41 pm
content: Hello All,I have an old but good Agilent E5062A network analyzer here.The device is now just 10 years old and it is time that I started to equip the device with a new hard drive.Here in the forum I find a lot of information about Rohde & Schwarz where the hard disk has been replaced but i can,t find anything about Agilent.Many older generation devices have a decent IDE hard disk.Does anyone have experience with converting the old (Windows 2000 professional / 3.5 inch 40 pin) IDE disk to a CF card or SSD hard disk?

author: Eugene1970
author_rank: Newbie
timestamp: January 05, 2021, 11:29:17 am
content: Hello.I have some experience in converting hdd to cf card.You need any program that creates a disk image to create a sector-by-sector disk image, then write it to the card.But some devices do not recognize the card as a disk image, you may need a specific driver.Another way is moving from win2000 to xp.I bought 5062A without hdd. And need hdd image.Сan you share the hdd image?If yes i will try to move it to xp and to cf card.Eugene.

author: joeqsmith
author_rank: Super Contributor
timestamp: January 05, 2021, 12:21:47 pm
content: Yes, I've installed SSDs in a few of my vintage 2000/XP instruments. Two of them have been in use for over five years now with zero problems. I've used both PATA to SATA adapter and standard IDE drives.

author: joeqsmith
author_rank: Super Contributor
timestamp: January 05, 2021, 12:30:39 pm
content: https://www.eevblog.com/forum/testgear/imaging-old-te-disk-drives-for-backup-repair-and-upgrades/msg2894856/#msg2894856https://www.eevblog.com/forum/testgear/teledyne-lecroy-waverunner-64xi/msg651413/#msg651413

author: analogRF
author_rank: Super Contributor
timestamp: January 23, 2021, 03:10:19 pm
content: Quote from: Eugene1970 on January 05, 2021, 11:29:17 amwere you able to convert E5062A to WinXP? How do you migrate the drivers and the application?

author: Eugene1970
author_rank: Newbie
timestamp: January 25, 2021, 06:18:51 am
content: I think it's possible.I need a disk image.Can you share it?
Agilent 66312A with EEROM checksum error - Page 1
Forum section: electronics / testgear

author: ranaraych
author_rank: Newbie
timestamp: January 24, 2021, 09:01:27 pm
content: I recently bought an Agilent 66312A Dynamic Measurement DC source on a "well-known auction site", but it always gives me error 1 at power on, and the protection cuts in as soon as the output is enabled.The service manual says that this error is Checksum in Read-only Non-volatile ROM, but does not suggest how to resolve or troubleshoot further.Can anyone suggest how to troubleshoot (or better, resolve) this problem please?
HP 339A Distortion Set - Page 1
Forum section: electronics / testgear

author: gdnichols31
author_rank: Regular Contributor
timestamp: January 19, 2021, 02:30:14 am
content: I have an HP 339A and it works great!The only problem is that the meter falls back into the case. There are 2 vertical brackets, one on each side, but they twist and allow the meter to fall out. I think there is a part missing that I don't know about. I haven't been able to find any pics on the web of the back of the meter.Can someone send me a pic of the back of their meter and show me what it should look like?Thanks,Gary

author: bob91343
author_rank: Super Contributor
timestamp: January 19, 2021, 06:24:57 am
content: The manual shows two meter brackets. MP3. They are positioned vertically with short flanges at the rear, facing inward.

author: gdnichols31
author_rank: Regular Contributor
timestamp: January 20, 2021, 12:56:50 am
content: Yes, I saw those in the manual, but I can't tell what holds them in. Mine are really loose.Gary

author: bob91343
author_rank: Super Contributor
timestamp: January 20, 2021, 06:12:41 am
content: Aren't there spaces for screws, threads, clamps, whatever?

author: gdnichols31
author_rank: Regular Contributor
timestamp: January 24, 2021, 04:12:33 am
content: No screw holes or anything else.There is a groove in the bracket and an indent in the meter housing. It looks like the groove should slide over into the groove, but I can't get it to go that far.

author: HalFoster
author_rank: Frequent Contributor
timestamp: January 24, 2021, 05:59:37 pm
content: It goes in the groove. Maybe make sure there is no buildup around the frame - they are *tight* and hard to get in place; you have to push inwards once it is far enough back. Also, I am pretty sure that there is a top and a bottom side.Hal

author: gdnichols31
author_rank: Regular Contributor
timestamp: January 24, 2021, 07:41:53 pm
content: Thank you for the input.I suspected that is the way it should work but wasn't sure.Gary

author: gdnichols31
author_rank: Regular Contributor
timestamp: January 24, 2021, 08:03:36 pm
content: I finally got it to 'snap' in place!Thank you again,Gary
Identify bugs in Tek TDS5054 - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: January 23, 2021, 02:13:03 pm
content: This came to me for repair from a customer. I thought they might be termites, but the larvae is fairly large...At least they had the decency to set up shop on the easily replaced DIMM.

author: Someone
author_rank: Super Contributor
timestamp: January 24, 2021, 01:27:51 am
content: Wasps?

author: tautech
author_rank: Super Contributor
timestamp: January 24, 2021, 02:51:52 am
content: Quote from: Someone on January 24, 2021, 01:27:51 amYep.https://en.wikipedia.org/wiki/Potter_wasphttps://en.wikipedia.org/wiki/Mud_dauberSufficiently fine ventilation grill designs keep them out.

author: james_s
author_rank: Super Contributor
timestamp: January 24, 2021, 04:20:32 am
content: That looks like a mud dauber nest. They built one in the muffler of my generator, I didn't notice before starting it up and wondered why it was sagging so badly under load. It's also a common problem with the old Coleman gasoline pressure lanterns, they'll build a nest in the air tube and cause the lantern to malfunction.

author: wolfy007
author_rank: Frequent Contributor
timestamp: January 24, 2021, 05:15:08 am
content: WOW, inside the scope, not the easiest access in the world but they still went there.

author: james_s
author_rank: Super Contributor
timestamp: January 24, 2021, 06:38:21 am
content: They can be pretty small and slip through small gaps like vent holes. It's common to find them in attics and sheds too.

author: tautech
author_rank: Super Contributor
timestamp: January 24, 2021, 07:24:54 pm
content: Quote from: james_s on January 24, 2021, 04:20:32 amThey can certainly be a problem in small petrol motor exhausts depending on the muffler port design where small round ports are the worst which they block completely and the motor refuses to start. The observant can hear a different note when pulling the starter as the normal pop on the exhaust cycle is missing and this is more prevalent on older designs without exhaust spark arrestors.In another life when I worked on small motors NZ Mason bee's work was a welcome source of additional income.
Power Designs HV-1565 schematics/manual needed - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: January 24, 2021, 02:43:33 pm
content: Have just refurbished one of these and it would be very helpful to have a copy of the manual and/or schematics to fine tune the calibration. I've looked everywhere I know and can not find anything either electronic or printed, so any help would be greatly appreciated.TIA,Hal
Low cost dual channel AWG or used Tektronix afg3021b, for power electronics/repa - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: January 31, 2021, 04:28:35 am
content: I have a 33120a, is good but, I need more powerful generator, I see lots of chinese brands with affordable prices ranges, but normally sample rate is not clear in their specifications, I can buy a used tektronix afg 3021b, for 400 usd, in these range of price, any low cost dual channel AWG that can work fine?Regards.

author: bdunham7
author_rank: Super Contributor
timestamp: January 31, 2021, 05:12:55 am
content: What do you mean by 'more powerful'--signal output, some feature, bandwidth or what?
10811-80111 - Page 1
Forum section: electronics / testgear

author: tchiwam
author_rank: Regular Contributor
timestamp: January 23, 2021, 03:39:27 pm
content: OK, seems that 10.0000000009 +/- 6µHz is the best I can get for now... that is after 24h warm up. The 1st 3 hours were all over the place.I am using a PRS10 as a reference, but I suspect that the 10MHz distribution has a lot of jitter... need to investigate...The trim pot on this one is not that friendly, just tapping the screw like a mini impact in the direction you need makes a big difference.Oh yeal and use an isolated screw driver, or a ceramic one if you can. The screw is part of the circuit.
T3 NC950 Net Chaser cable tester - Page 1
Forum section: electronics / testgear

author: confiarus
author_rank: Newbie
timestamp: January 22, 2021, 09:20:56 pm
content: I have a T3 NC950 Net Chaser with AR104 Active Remote. Owned it for 3 years and it quit working. It turns on but every test fails. I sent it in to Platinum Tools (they are the only repair company i can find) and they said they couldn't fix it and they couldn't get the circuit board for either the main unit or the remote. Reaching out to find out if anyone may have a T3 NC950 or AR104 to sell for parts. We paid close to $1700 for this equipment new and it only lasted 3 years . Any info would be greatly appreciated about parts, or, repair.
BK 5492B multimeter (personal) reviews? - Page 1
Forum section: electronics / testgear

author: Old Goat
author_rank: Contributor
timestamp: January 22, 2021, 07:13:34 am
content: Ok, did a search and found nothing like what I'm curious about. And that is I'm looking for personal experience reviews of a BK 5492B multimeter. If you have one, have used one, etc, do you give it a yes, no, or maybe?Thanks in advance.
An oddball oven reference board for HP 53132A / no questions, just information - Page 1
Forum section: electronics / testgear

author: tkamiya
author_rank: Super Contributor
timestamp: January 22, 2021, 06:39:31 am
content: I have several HP53132A. One of them came with an unusual board with a medium reference oscillator. What's odd is, this board does not have a socket for HP10811 like the most I've seen. It appears to be an earlier version. It does have extra holes and unused mounting holes. No information what-so-ever on Internet.My board had an OCXO that drifted out of adjustable range, so my project became finding a replacement. The medium OCXO isn't that great, so I wanted something better. Interestingly enough, I noticed outer holes supply 12V. (medium one is 5V) After tracing connections, I found the pattern and pin out is a good match for MV89a. I happened to have one, so soldered in and tried to auto-cal. First attempt failed. I noticed a jumper W1 on outer edge of the board. With no documentation and nothing to lose, put a jump plug on it and retried auto-cal. It took 2 hours but it actually cal'd. Tried it one more time. It finished in 10 minutes this time.I just wanted to provide this information in case someone has this old style board with his/her/their HP53132a and want to improve stability. As far as I know, MV89a has a spec better than the best OCXO HP has provided for this counter. Of course, MV89a coming from China is always a suspect. I'll have to age mine and see what happens in a month or so.
NanoVNA V2+4 CW Output - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: December 06, 2020, 09:32:05 pm
content: I've notice the V2+4 version is pulsed CW, while the SAA-2N version is continuous when using CW output. Both are running the same 20201013-32077fd firmware. Anyone know why the V2+4 version has a pulsed CW output rather than the desired continuous CW output of the SAA-2N, while both are utilizing the same firmware? This makes the V2+4 version basically useless for use as a signal generator!!Best,

author: harrimansat
author_rank: Regular Contributor
timestamp: January 21, 2021, 12:30:45 pm
content: Do you know any more about plus4 and CW?
RIGOL DS1202Z-E and SALEAE test probes impedance - Page 1
Forum section: electronics / testgear

author: marcel22
author_rank: Newbie
timestamp: January 20, 2021, 01:32:29 pm
content: Hi everyone - I have been using DS1202Z-E and official Saleae for a while now, however I have an issue now debugging a low power circuit. The circuit under test contains a few 1MOhm pullups / pulldowns where the 1MOhm Saleae input probe impedance interferes with the circuit.The question I have - DS1202Z-E datasheets says the input impedance is also 1MOhm, however where is this resistor actually located? - is this in the probe - so replacing the probe to (lets say) 10MOhm would give me less circuit interference from the scope? If so can you recommend a specific probe to get?I use Saleae much more often than the scope, but if Saleae is not modifiable Im fine with the Rigol.Thanks a lot for any suggestions!MarcelPS: Is this the 10x thingie switch on the probe? 1x = 1MOhm, 10x = 10MOhm input impedance?Edit: Typos

author: Fungus
author_rank: Super Contributor
timestamp: January 20, 2021, 02:15:37 pm
content: The switch will change the impedance, yes.You should almost always have it in 10x mode when you use the 'scope. 1x is a special use case.
Using a VGA monitor in 19,2KHz HP equipment (E8285A as an example, also 8020, 24 - Page 1
Forum section: electronics / testgear

author: tabajaralabs
author_rank: Regular Contributor
timestamp: January 20, 2021, 05:59:54 am
content: Hi All!I have an E8285A CDMA test set from HP and, like most of us, the EL display is failing.I got to connect a GBS8200 board on that. I know this is no news, so I did a writeup (in portuguese and english) on my blog.https://tabajara-labs.blogspot.com/2021/01/como-ligar-um-monitor-vga-no-hp-e8285a.htmlThere is nothing "special" on that. You connect composite video on G pin of RGBS connector, uses a LM1881 to separate composite sync and connect it (pin 1 of LM1881) to S input of RGBS connector.But I looked a lot for this info and wasn't able to find. Now, you can find it. Hope it helps someone.
Korad KEL103/Tenma 72-13210 - Page 1
Forum section: electronics / testgear

author: Helix70
author_rank: Unknown
timestamp: January 20, 2021, 01:40:55 am
content: Can someone tell me what the pitch and diameter of the binding posts for the Korad KEL 103 / Tenma 72-13210 are? Is the quasi standard 29.972 mm - 1.18"?Can the binding post screw caps be removed completely?I want to either buy or design an adaptor PCB for binding posts.
Tektronix TDS 520A - FFT - Page 1
Forum section: electronics / testgear

author: rfabe098
author_rank: Newbie
timestamp: January 25, 2021, 10:54:48 pm
content: Hello! I am a new user to this forum and I need some advice on an oscilloscope I recently bought.I have obtained a Tektronix TDS 520A from ebay and I have been experimenting with all of the features. I have noticed that the FFT (fast Fourier transform) function is greyed out when I try to select it.Does the Tektronix TDS 520A have the FFT functionality? Is there a way to enable it?

author: Andy Watson
author_rank: Super Contributor
timestamp: January 26, 2021, 12:19:29 am
content: Probably.You will need a method of talking to the processor. Using the GPIB bus works, however, if you do not have one I believe there is a "console" connection in the scope.Have a read of this thread:https://www.eevblog.com/forum/testgear/hackingupgrading-old-scope-(tds754d)/Also, search the forum for the password "PITBULL"
HP 5005A Signature Multimeter - What are those ROMs? (Want to backup them) - Page 1
Forum section: electronics / testgear

author: merox
author_rank: Regular Contributor
timestamp: January 19, 2021, 07:43:42 pm
content: I've got a 1981ies vintage HP 5005A Signature Multimeter sitting on my desk right now, surprisingly in almost working order apart from the cables to the pods being broken. Usually I find some unobtanium ECL stuff being broken in devices like thisSince this thing is now 40 years old (yikes, that's almost 10 years older than me) I'd like to make a copy of its ROMs in case they might fail in the future. I know that they're not as prone to failure as (E)EPROMs but I thought I'd better be safe than sorry.After looking into the schematic I'm a bit baffled, because I've never seen something like those ROM chips (maybe I'm just not old enough?).The whole meter is built around an standard Intel P8085 processor dating from the 70ies, but those ROMs (there are three of them) seem like a weird combination of a 2k ROM with an integrated data line buffer in a 40 pin package to me. I've attached a part of the schematic to this post on which one of them is visible. Does somebody recognise that thing or can point me into the right direction?Edit: The ROMs are supplied with 5V only, that part is unfortunately missing from the top of the screenshot

author: merox
author_rank: Regular Contributor
timestamp: January 19, 2021, 07:59:08 pm
content: Damn, now I feel stupid. 5 more minutes of googling and now I think they seem to be Intel 8355 (ROMs) respectively 8755A (EPROMs) which surprisingly seem to be supported by my programmer :-OSo I guess I have to change my question to: Is there any modern replacement for this or has anybody built something compatible?

author: srb1954
author_rank: Super Contributor
timestamp: January 20, 2021, 01:34:11 am
content: Quote from: merox on January 19, 2021, 07:59:08 pmI very much doubt there is a modern replacement as this has been superseded by modern micro-controllers with in-built program memory. This chip was really just a interim measure for producing a 2 chip micro-controller system before the advent of the first single chip solutions.
Fluke 87 III - Page 1
Forum section: electronics / testgear

author: rauldm
author_rank: Regular Contributor
timestamp: January 20, 2021, 03:56:21 am
content: Today it come to me a "as new" Fluke 87 III, this meter gives me great impressions, first, is incredible the quality with these meters was manufactured. I bought a 87 V on 2016 and 2019, from 2016 to 2019 the quality was decreaced, the simbols and letters are printed with minor sharpness, the 2016 says in back, "Made in USA" the 2019 says "assembled in USA", this part was a preambule only.I compared the Fluke 87 III with 87V and I have next results-Autorange is to fast, even is more than my Hioki dt4253.-Frequency response says 20 kHz true RMS, but I tested with 1 V rms sinusoidal and square waveform from 1 kHz to 125 kHz, the Fluke 87 III shows 1.010 V while the Fluke 87 V says near to 0 V, the Fluke 87 III has a frequency response similar to my Fluke 289 and keysight u1282a, really I impresed with this.Two things bad on Fluke 87 III is the high resolution mode, is very slow and capacitance mode only 5 uF, ok, the capacitance is not important for me, because I prefer use a DE-5000.I atached some pictures.

author: rauldm
author_rank: Regular Contributor
timestamp: January 20, 2021, 03:57:10 am
content: Other

author: rauldm
author_rank: Regular Contributor
timestamp: January 20, 2021, 03:57:44 am
content: .

author: rauldm
author_rank: Regular Contributor
timestamp: January 20, 2021, 04:42:39 am
content: Autorange speed
Schlumberger 5271B oscilloscope - Page 1
Forum section: electronics / testgear

author: BChT
author_rank: Newbie
timestamp: January 19, 2021, 01:33:28 pm
content: Hello everyone, I'm trying to find my first analog oscilloscope on the budget. I found this oscilloscope - Schlumberger 5271B for a decent price, locally, but I coundn't find any specification or anything. Does someone have a manual or maybe an advice, is this a good choice, it looks ok but again I never bought or used an oscilloscope before, I only watched Dave's guide on buying first scope so I'm a begginer in this. There are some photos from the seller, I'm not sending a link, because it's not in english and the only description is that it's working and one probe comes with it.

author: rvalente
author_rank: Frequent Contributor
timestamp: January 19, 2021, 04:33:14 pm
content: I've never seen this one, first time ever I see a scope in french, nice!Look for tek 22xx series, like 2235https://w140.com/tekwiki/wiki/2235

author: shakalnokturn
author_rank: Super Contributor
timestamp: January 19, 2021, 06:50:00 pm
content: Knowing Enertec Schlumberger equipment the build quality should be decent.Not having a user manual shouldn't be much of a problem there's nothing very complicated about it.The things that would make me think twice are the storage type CRT and the possible lack of schematics.

author: shakalnokturn
author_rank: Super Contributor
timestamp: January 19, 2021, 07:25:06 pm
content: The vertical section appears to be a plug-in module.I'm guessing that the full model name may be CRC 5271B as the look of it is very similar to the CRC (Constructions Radio électriques et électroniques du Centre) named models.CRC starts at the end of the 1920's developing TV and RADAR equipment their first scopes sold in 1947, they were bought by "la Compagnie des compteurs" in 1949, then merged with Schlumberger in 1970 until the CRC division ceased activities in 1991.
HP 8133A 3Ghz pulsgenerator power entry filter. - Page 1
Forum section: electronics / testgear

author: Elektronicos
author_rank: Newbie
timestamp: January 17, 2021, 03:21:54 pm
content: Hi guys,I recently bought an non-working HP8133A from a US seller on eBay. My objective is to repair and restore the device for personal use and while doing so I want to stay as close to the original as possible.I did find the service manual, in which there are oddly enough no schematics present, as opposed to the service manual for the HP8131A.Unfortunately my HP8133A is missing the power entry filter, of which I cannot find any information in the service manual of both the HP8131A and the HP8133A.In general these filters have a small tendency to fail once in a while, so it's probably removed in some kind of repair attempt or it's scavenged for another device.Brings me to my questions:1. Why doesn't the HP8133A service manual contain the schematics and does anyone perhaps happen to have them?2. Does anyone know the brand and model number of the power entry filter and whether or not HP applied ferrite beads around the main power wires?I know similar models are relatively easy to find, but I am not sure about the compatibility of the pinout, which fortunately is described in the service manual.I would be very grateful if someone could provide me with this little, yet illusive information.Thanks,Edwin.Service manual HP8133A:http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=08_Stuff_Not_Sorted/4_Miscelaneous/PULSE/8133Service manual HP8131A:https://www.google.com/url?sa=t&source=web&rct=j&url=http://electron.mit.edu/manuals/manuals/Agilent/8131A/08131-90001.pdf&ved=2ahUKEwi4ucinh6PuAhWMzaQKHdNfC-QQFjACegQICBAB&usg=AOvVaw34wbj-KD5INYR10TWO3Igm

author: Elektronicos
author_rank: Newbie
timestamp: January 17, 2021, 05:34:40 pm
content: Addendum:A number is visible on the back above the main voltage indication of the power entry. It can simply be read on the outside and perhaps that number can already lead me to the right part.

author: bson
author_rank: Unknown
timestamp: January 17, 2021, 08:11:01 pm
content: There's no number on the outside. All it says is "Schaffer" and nothing else, other than 120V etc. I don't know if this is original.I'm not opening mine up again...

author: George Edmonds
author_rank: Frequent Contributor
timestamp: January 18, 2021, 11:19:29 am
content: HP used various IEC/Fuse/Voltage selector assembles, look at Schaffner FN379-6-21 as a starting point, these are not cheap.George
RD60xx ps: how to get CC mode? - Page 1
Forum section: electronics / testgear

author: iXod
author_rank: Frequent Contributor
timestamp: January 17, 2021, 04:25:49 pm
content: The Riden RD6006 series ps controllers out of the box default to CV mode. I can’t find in the very brief manual download how to get to CC mode.A clue would be happily received.Thanks.

author: AaronR
author_rank: Contributor
timestamp: January 17, 2021, 08:39:39 pm
content: Quote from: iXod on January 17, 2021, 04:25:49 pmYou might want to ask here.https://www.eevblog.com/forum/testgear/ruideng-riden-rd6006-dc-power-supply/

author: S. Petrukhin
author_rank: Super Contributor
timestamp: January 17, 2021, 09:44:22 pm
content: Quote from: iXod on January 17, 2021, 04:25:49 pmCV and CC modes are always on. Their values are shown on the screen next to the current indicators and are set by the I-Set, V-Set buttons.When the load consumes current less than the limit, CV mode works, as soon as the current exceeds the set, CC mode will turn on automatically and CC indicator show.I.e. this PSU will never give voltage and current above the set automatically.It may seem strange to have CV - it's just setting the current voltage, but this mode is also necessary - it sets the maximum voltage when the PSU can not reach the set maximum current - a similar solution is used when charging the battery.

author: Tjuurko
author_rank: Regular Contributor
timestamp: January 18, 2021, 07:32:16 am
content: CC mode for all power supplies is limited: true CC mode = infinite output voltagewithoutload.