hybridfree/eevblog-posts huggingface dataset:
MSO or DSO + PC-side tools for data acquisition use and jitter analysis - Page 1
Forum section: electronics / testgear

author: boonshen
author_rank: Newbie
timestamp: September 11, 2020, 07:37:39 pm
content: Hi everyone first time poster hereI'm looking for a scope mainly for hobbyist stuff(SBC design, motor controller, audio equipment etc) and embedded system latency/jitter analysis. My current need is to have a device that can export timing jitter histogram and jitter trend, something similar to infiniivision 6000-x can without costing an arm and a leg. AFAIK mso scope like Rigol MSO5000 or sds2000x+ have the ability to show realtime timing histogram but no jitter trend capability, can anyone with those scope confirm? Another option for me is to pick a scope that have good remote/streaming features and do the timing analysis in matlab/python/labview.Of course using mso to do some sanity check and stream data to computer is also fine.Any suggestion or insight on this type of usage? I prefer something below $500 but if scope features is good I don't mind spending $1000+.
SG-816/U High Power Pulse Generator - Page 1
Forum section: electronics / testgear

author: graybeard
author_rank: Frequent Contributor
timestamp: September 03, 2020, 11:59:19 pm
content: I bought this pulse generator about 25 years ago at theW6TRW swap meet. It has always worked, and was working the last time I fired it up about two years ago. It is capable of putting a 50 Volt pulse into a 50 Ohm load, that is 50 Watts of power.I have never been able to locate any documentation for this unit, so please chime in if you know of a source. It was built by Systron-Donner/Datapulse in Culver City California in 1969, based on the component date codes.It is an interesting hybrid circuit that uses Silicon bipolar transistors, Silicon and Germanium diodes, 2nuvistors, and a pair of of7534 high power/high reliability pentodesas cathode follower output drivers.It is a somewhat unique instrument, so I thought I would share some photos. You can click on any of the photos to see the full resolution images.... Chris

author: 0culus
author_rank: Super Contributor
timestamp: September 04, 2020, 02:16:25 am
content: Very cool...for radar testing I presume? Guessing since it says made for the Navy.

author: graybeard
author_rank: Frequent Contributor
timestamp: September 05, 2020, 02:05:13 pm
content: Quote from: 0culus on September 04, 2020, 02:16:25 amWhen I did some more online searching for a manual I found two references to it being used for Sonar tests.... Chris

author: TimFox
author_rank: Super Contributor
timestamp: September 05, 2020, 03:32:42 pm
content: I looked at the datasheet you linked for the 7534 output tubes--quite impressive. Before this, I was unaware of frame grids in power tubes, which gave the 7534 a 25 mA/V transconductance and very low screen current (4 mA).Back in grad school, I used Delco high-voltage TO-3 transistors (higher voltage part in the same series as your DTS-423) to generate 1000 V pk-pk deflection waveforms, using a cascode totem-pole output stage.

author: graybeard
author_rank: Frequent Contributor
timestamp: September 05, 2020, 03:45:31 pm
content: Running bipolars in common base mode (cascode output stage) allows you to swing the almost full base-collector breakdown voltage on the device so long as it is not in a high radiation environment.

author: graybeard
author_rank: Frequent Contributor
timestamp: September 06, 2020, 12:20:40 am
content: I fired it it up again today. Here are some output waveforms into a 50 Ohm load. I used a 20W 20db attenuator into a 2W 20dB attenuator into a 50 Ohm feed through termination.Chris

author: graybeard
author_rank: Frequent Contributor
timestamp: September 11, 2020, 06:49:09 pm
content: I was looking again online to see if I could find a manual for the SG-816/U High Power Pulse Generator. I have not, but I did find specifications for it:Chris
Looking for info on TrueTime GPS-DC-416 Rubidium - Page 1
Forum section: electronics / testgear

author: Kean
author_rank: Unknown
timestamp: September 06, 2020, 02:32:51 pm
content: I have a TrueTime GPS-DC-416 2RU unit 1993 vintage (aka Mk III) with Efratom RFS-C Rubidium - but I have found no documentation other than for the Efratom unit.It powers up and displays a firmware version on the LCD "TRUETIME Mk III sys ver 014f", but then apparently hangs. It sometimes shows random segments on the time display. The 80186 CPU gets pretty warm. The 5V rail seems OK. I've pulled out almost all the boards for a minimal system - just power, CPU, front panel - and still does the same.There is no output on the frequency or PPS BNCs. I haven't yet checked the RS232 port. I don't have a GPS antenna connected - will need to dig around for a 12V antenna or set up DC block & bias tee for my 5V ones.I've attached a couple of photos. I see there is a lot of similarity with the XL-DC chassis, but this is clearly older.Does anyone have a GPS-DC? Should it hang at this point without more external stimulus?pacAir seemed to mention having one, but not sure if it was the 1RU or 2RU version. I found only one mention of this model out there on time nuts back in 2014, and no one knew much.Maybe I should just pull out the Rb unit and try run it up on its own, and scrap most of the rest except maybe the output boards.

author: ZigmundRat
author_rank: Regular Contributor
timestamp: September 10, 2020, 08:47:18 pm
content: Looking at the back panel, it sort of implies that two power inputs are required: AC for the main system and 24VDC for the rubidium. Are you supplying both? If the Rb is not putting out 10MHz that could certainly be why you have no output from the different 1/5/10 ports and the pps. I’m not entirely sure, but it could also be why it apparently hangs. Have you checked the Rb output? If necessary you can supply it with 24V from another external supply and see what happens.

author: Kean
author_rank: Unknown
timestamp: September 11, 2020, 02:28:12 pm
content: Great suggestion! I had assumed it was just a backup power source. I will give that a go sometime next week.
Help! high power supply ripple? - Page 1
Forum section: electronics / testgear

author: Ryanfawcett
author_rank: Newbie
timestamp: September 11, 2020, 02:37:09 pm
content: I have a Manson EP-613 linear power supply, output ripple should be 5mV pk-pk according to data sheet, however I am getting 400mV pk-pk as seen from photos regardless of load.I’m sure I measured it when I bought it and it was within spec, have I damaged it somehow?Cheers,Ryan

author: jsantoro
author_rank: Regular Contributor
timestamp: September 11, 2020, 02:41:24 pm
content: Change the scope to AC coupling.

author: Kean
author_rank: Unknown
timestamp: September 11, 2020, 02:44:17 pm
content: And turn on 20MHz BW limit

author: Kean
author_rank: Unknown
timestamp: September 11, 2020, 03:49:47 pm
content: Aha, the PSU is off in second photo!You likely have an external noise source being picked up by the probe. New LED lighting maybe?Dave has talked about similar PSU ripple measurement issues in a recent video.

author: Kosmic
author_rank: Super Contributor
timestamp: September 11, 2020, 04:02:28 pm
content: Also the ground lead of the probe is too long. It's better to use a probe<->BNC adapter, then BNC to Banana to the power supply.

author: tautech
author_rank: Super Contributor
timestamp: September 11, 2020, 08:25:44 pm
content: Quote from: Ryanfawcett on September 11, 2020, 02:37:09 pmWelcome to the forum.There are a few traps for the unwary in accurately measuring low levels of PSU ripple especially the background noise. LED lighting is particularly bad. Adding a resistive load to the PSU and measuring ripple at it terminals also helps suppress external noise.Some tips for you in the screenshots in this thread:https://www.eevblog.com/forum/testgear/a-good-scope-for-measuring-low-levels-of-noise-(e-g-linear-ps-noise)/

author: David Hess
author_rank: Super Contributor
timestamp: September 12, 2020, 01:05:25 pm
content: Use a differential or isolated probe to remove common mode noise.
LQ-9101 LCR meter high resolution pictures - Page 1
Forum section: electronics / testgear

author: nmccl1
author_rank: Newbie
timestamp: May 11, 2019, 01:33:43 pm
content: Recently got one of these LQ-9101 LCR meters from ebay and wanted to post some pictures of the insides since when researching it I couldn't find any.Also heres a link to a previous thread with its manual:https://www.eevblog.com/forum/testgear/lq-9101-lcr-meter-manual/

author: pizzigri
author_rank: Regular Contributor
timestamp: September 10, 2020, 12:51:31 pm
content: Hi, can anyone comment on this Chinese meter performance?I have the XWJ01 previous generation LCR meter, and was wondering whether it would be Worthwhile to “upgrade”.Also, in some instances the XWJ01 returns 5 significant digits, and they are not so distant from my HP 34401A resistance measurements, is that so with the LQ-9101?In short what is your experience with this bridge?Best, franco
DMM 34401A ) I would like to link the device with Arduino. Please help me.  - Page 1
Forum section: electronics / testgear

author: GwakPyoSung
author_rank: Newbie
timestamp: September 12, 2020, 05:43:10 am
content: I would like to link the device with Arduino.Reference site address:Like the video above1) Schematic implementation method2) Source code contentHelp. Please help me.

author: calin
author_rank: Regular Contributor
timestamp: September 12, 2020, 06:01:59 am
content: Why wold you want to do that , I mean that complicated with arduino? The guy in the video most likely is using the arduino to "proxy" the serial port connection on the meter to the PC.My advice - get a simple R232 to USB adapter from ebay like this onehttps://www.ebay.com/itm/New-USB-1-1-to-RS232-DB9-Serial-Port-Adapter-Converter-with-USB-Cable-Adapter-US/182297261602(they are super cheap like 4-5$) and call it a day.If you want GPIB not serial .. look at this thread -https://www.eevblog.com/forum/projects/ar488-arduino-based-gpib-adapter/msg2191794/#msg2191794.I built one and it actually works decent with my older 3478A meter, for the 34401A you also have the serial option.

author: coromonadalix
author_rank: Super Contributor
timestamp: September 12, 2020, 11:44:09 am
content: Totally hate youtubers who show a project and dont even answers the questions or post their code to the community ....The arduino is polling the meter and send the stuff on the serial terminal. oh right the meter can be set to talk mode, the adruino is acting as an interface to pc.@GwakPyoSung time to learn Arduino codingHere's the link providedhttps://www.societyofrobots.com/robotforum/index.php?topic=16988.0
SLA5032 logic Analyzer & Pulseview - Page 1
Forum section: electronics / testgear

author: Electroalice
author_rank: Newbie
timestamp: September 09, 2020, 02:30:40 am
content: HiI purchase one of these off ebay but can not get it to run on Windows 10.I have an older LWLA1034 that works well with Sigrok PulseView ( a very nice GUI for any LA)The SLA5032 was redesigned in about 2019.and reports version 1.2.Has anyone been able to one of the new version SLA5032 to worK ?Any suggestions would be appreciated.ThanksRobert

author: coppice
author_rank: Super Contributor
timestamp: September 09, 2020, 02:56:58 am
content: I have an SLA5032 that is maybe 6 or 7 years old. This is currently working OK with Sigrok Pulseview on a Fedora 32 machine, using whatever revision of Pulseview is in the Fedora repositories RPMs.You didn't say what fails. Does Pulseview fail to recognise the hardware? Is it recognised but won't run?

author: Electroalice
author_rank: Newbie
timestamp: September 09, 2020, 06:42:15 am
content: I have renamed the FPGA bit file and placed it in the correct directory as directed.Pulseview finds the hardware.The error message I get is "Failed to open device generic/ unspecified error" but reading the log file give a different storyssr: hwdriver: Scan found 0 devices (saleae-logic16).sr: hwdriver: Scan found 0 devices (siglent-sds).sr: hwdriver: Scan found 0 devices (sysclk-lwla).sr: hwdriver: Scan found 1 devices (sysclk-sla5032).sr: hwdriver: Scan found 0 devices (yokogawa-dlm).sr: hwdriver: Scan found 0 devices (zeroplus-logic-cube).sr: device: sysclk-sla5032: Opening device instance.sr: usb: Trying to open USB device 2.17.sr: usb: Opened USB device (VID:PID = 2961:66b0, bus.address = 2.17).Notifying user of session error: "generic/unspecified error"if I then used the device drop down menu to attempt to connect again the following is added to the log file.sr: device: sysclk-sla5032: Device instance already active, can't re-open.Notifying user of session error: "generic/unspecified error"I have just started to look at the USB dialog with Wireshark to get more details.There was a PCB redesign last year changing it to a single PCB. My board is labeled SLA5032_2019A.Maybe the new card is not compatible with Pulseview?

author: Electroalice
author_rank: Newbie
timestamp: September 10, 2020, 07:54:24 am
content: Looks more like a driver issue. When I checked events on the driver I sawDevice USB\VID_2961&PID_66B0\5&887acb0&0&9 was not migrated due to partial or ambiguous match.Last Device Instance Id: USB\VID_067B&PID_2303\5&887acb0&0&9Class Guid: {4d36e978-e325-11ce-bfc1-08002be10318}Location Path: PCIROOT(0)#PCI(1400)#USBROOT(0)#USB(9)Migration Rank: 0xF000FFFF00000023Present: falseStatus: 0xC0000719As I have well and truly cross the boundary into an area of my knowledge where "a little knowledge is dangerous" it is time to stop and put it on the shelf for 6 months or run over it with my 4WD.Fortunately I have an old LWLA1034 that works.
Experience with / Recommendation for Velleman LABPS3005SMU Power Supply - Page 1
Forum section: electronics / testgear

author: shaunakde
author_rank: Contributor
timestamp: July 27, 2020, 04:57:32 pm
content: I came across this switching power supply (Velleman LABPS3005SMU) onAmazon(also on TEquipment.net) and was wondering if anyone had any experience with this particular supply.Looking at the specs on theirofficial websitethis is what I could find:Input Voltage: 230 VAC 50 HzOutput Voltage: 0-30 VDC adjustable max.Output Current: 0-5 A adjustable max.Ripple Voltage: 200 mVp-pDimensions: 85 × 160 × 205 mmWeight: 1.62 kgFuse: T3.15The ripple voltage seems to be in line (or slightly worse) then theRD6006for example, but I am not sure if these values are typical.The reason I am in the market for a supply is that we won't have access to our local makespace anytime soon due to the pandemic, (and in any case I would like to start building up some basic test-equipment at home). Currently my choices are 1. A RD6006 from a US Aliexpress warehouse ($126 - case+supply+module) and 2. the LABPS3005SMU from Amazon/TEquipment ($60)Any thoughts or alternate suggestions would be appreciated.

author: Tarko
author_rank: Newbie
timestamp: September 10, 2020, 11:18:42 am
content: Im new EE enthusiast and been looking at bench PSU too.I have been looking at the RD6006 too but haven't committed yet.Did you?

author: ledtester
author_rank: Super Contributor
timestamp: September 10, 2020, 11:50:38 am
content: QuoteYou should also look at the Korad KA3005... it's received a lot of attention on this forum.https://www.eevblog.com/forum/beginners/korad-ka3005p-253088/msg3223152/#msg3223152https://www.eevblog.com/forum/beginners/cheap-power-bench-supply-any-recommendations/msg3211034/#msg3211034oh, and also the Gophert NPS-1601.
E-Load Kunkin KP184 vs East-Tester ET5420, Accuracy ADC DAC?? - Page 1
Forum section: electronics / testgear

author: lambcutlet
author_rank: Contributor
timestamp: August 30, 2020, 07:59:39 pm
content: Hi, I'm trying to choose between these two Electronic Loads Kunkin KP184 vs East-Tester ET5420the Kunkin looks very robust slightly dated perhaps and has lots of online information regarding manufacturing issueswhereas the ET5420 seems to be newer with a simplified PCB design and I just wondered if it has the accuracy of the KunkinDoes anyone know what DAC & ADC the ET5420 uses? or Does it rely on the 12bit DAC & ADC inside the STM?the specs listed by vendors on AliExpress show identical resolution values of 0.05% for both units (voltage & current) so i can't distinguishKunkin KP184,Single channel, 0-150V, 400WSTM32F030C8ADC AD7799 24bitDAC MCP3421 18bit, DAC8831I 16bitEast-Tester ET5420,Dual channel 0-150V, 200WSTM32F103ADC ??DAC ??

author: aristarchus
author_rank: Regular Contributor
timestamp: August 30, 2020, 09:04:05 pm
content: Got the Kunkin KP184, board ver04.One difference that does mean something for me, between those two loads, is that there is no sense input in the ET5420.That could mean something for its accuracy.Also seen a thread in here for ET5420https://www.eevblog.com/forum/testgear/east-tester-et5410-et5420-et5411-et54-series-software/you could ask them.

author: Hydron
author_rank: Super Contributor
timestamp: August 31, 2020, 01:31:59 pm
content: Quote from: aristarchus on August 30, 2020, 09:04:05 pmI am also trying to pick an electronic load and have similar concerns about the East Tester - would definitely like a sense input.However in it's favor the East Tester does have a 500V option for a little more money, which is quite attractive for me (I am working on a PFC design), and a front mounted power switch (the lack of which seems kinda insane on the Kunkin given there is room there!)The other possibility I found is a "Dingchen" DCL6104(A), again with a 500V option (the A model) but also again without many reviews etc. Any comments on either the Dingchen or East Tester from someone who has one would be welcome.Finally given you're in the UK it's worth looking at the Tenma loads from CPC/Farnell (use the former for better pricing) - they do a rebrand of the 300W Korad load for 222 GBP inc VAT.

author: lambcutlet
author_rank: Contributor
timestamp: September 08, 2020, 08:35:40 pm
content: Hi, thanks for your commentsyes, you were quite right the ET5420 doesn't have external sense but i did plan on modding it. I still haven't found any further detail.Dingchen DCL6104(A) i hadn't come across this one before, the spec sheet looks similar to the kunkin kp184 but with a TFT display and no external sense, but interesting nonetheless.But your suggestion of the Tenma brand from CPC the spec looks better, it has better measurement tolerance, LAN for comms, one years warranty and requires no mods.Kunkin KP184, needs stripped and modified as suggested by several people.Head says Tenma but the heart says Kunkin because i like doing mods
R&S UPA Audio Analyser : adding options - Page 1
Forum section: electronics / testgear

author: psykok
author_rank: Frequent Contributor
timestamp: September 08, 2020, 10:32:27 am
content: Hi,Does someone know how we can add extra option to an R&S UPA Audio Analyzer?Alex

author: Sighound36
author_rank: Frequent Contributor
timestamp: September 08, 2020, 12:15:33 pm
content: Hello AlexFrom experience you have to buy them, especially all of the digital audio side, its a hardware and software upgrade along with the second generator.Buying a quality used UPV is the least expensive part of owning one
Faulty BM235 Meter - Page 1
Forum section: electronics / testgear

author: DrRunCMD
author_rank: Newbie
timestamp: September 07, 2020, 06:37:27 pm
content: Hi all,I have an issue which I not log ago posted in the comments section in video #884. There are a number of issues I noticed when I came to test a circuit:When I noticed iffy values when I was testing the voltage drop of a 20 Ohm 2W TH resistor in series on a 12v PC fan circuit. Fan specs are 12v @ 0.23 A.I noticed, the readout on the meter was not right, so I checked the output voltages on various supplies to rule out my bench supply being faulty:Normal v (DC) auto-ranging mode:30v Output = 2.759v12v Output = 1.104v10v Output = 0.919v05v Output = 0.460vHigh Impedance mode: all bang on output voltage.Other strange issues:1) When in normal V test mode, pressing range button 3 times causes the meter to alert saying 'Insertion Error' briefly then spazzing out.2) When turning on the LED back light, the buzzer makes a strange beep.3) Continuity mode just beeps with or without test leads connected.There is more, but I will post a video shortly. My first port of call was the batteries, so I changed them out twice. No change in problems.Similar signs of the meter that Dave took back with the strange rotating switch glitches.LoZ mode on the meter seems to be the only mode that works without problems.Any ideas or similar issues reported??My firmware version is reported as '9' by the way.

author: MiroS
author_rank: Regular Contributor
timestamp: September 08, 2020, 09:26:06 am
content: Quote from: DrRunCMD on September 07, 2020, 06:37:27 pmWhy you are nots ending it to seller for repair / replacement ? Brymen has good customer service .
Problems with left side menu of new DS1054Z - Page 1
Forum section: electronics / testgear

author: Bart1965
author_rank: Newbie
timestamp: September 07, 2020, 06:28:30 am
content: Last week I received my new DS1054Z oscilloscope. Yesterday I noticed the left hand menu not functioning properly. The top button should toggle between horizontal and vertical, which it doesn't do anymore. The two lower scroll buttons don't scroll. The +width and -width buttons are non functional as well. After rebooting the oscilloscope +width and -width are also activated (Power set is on default). It's like these two buttons are continuously pressed and messing with the other keys. Pressing the other options like frequency twice gives me the message "Existed item", like they should (the English texts could be better). The +width and -width buttons do nothing, though pressing Menu seems to do something with the delay time in the top right.Firmware version is 04.04. I don't know which SP. I will update this as soon as I can check it.Anyone has seen this behaviour or has a way to solve it?Update: firmware version is 00.04.04.04.03. Reflashing it did not resolve the issue.One of the unresponsive buttons is also the "magic" reset button, and it happens that reset is not working either.

author: Fungus
author_rank: Super Contributor
timestamp: September 07, 2020, 07:43:44 am
content: Quote from: Bart1965 on September 07, 2020, 06:28:30 amThere's something very wrong, send it back.
DS1000Z with DS1000Z-E firmware - Page 1
Forum section: electronics / testgear

author: fresird
author_rank: Newbie
timestamp: September 08, 2020, 09:37:52 am
content: Hi Guys,I accidently updated my ds1054z to ds1000z-e firmware(https://beyondmeasure.rigoltech.com/acton/ct/1579/p-00ac/Bct/-/-/ct67_0/1?sid=TV2%3AQ2jKaGpUj). I looks like the software is newer, but there are bug. I want to downgrade the ds1000z firmware, but failed. I think the new firmware is not downgradable. Any idea to fix this?

author: tv84
author_rank: Super Contributor
timestamp: September 08, 2020, 10:09:58 am
content: Here. Read the last messages.

author: Fungus
author_rank: Super Contributor
timestamp: September 08, 2020, 11:21:39 am
content: Quote from: fresird on September 08, 2020, 09:37:52 am"Accidentally"??

author: fresird
author_rank: Newbie
timestamp: September 09, 2020, 03:05:05 am
content: Hi tv84,thanks for the information. It is a lot of information. I didn't managed to restore the firmware yet. I downloaded another firmware from Rigol and now the model is "DS1104Z" and software version is "04.06.01". This one the wave noise is back to normal so I think I can use this firmware for some time.Hi Fungus,I didn't mean to update the old ds1000z scope to a ds1000z-e scope.(e means enchanced?). I was using the UART decoder function, and it lags. I didn't check the firmware updates since I bought it and entered the option code a few year ago. so I hope rigol has made a better firmware. and then I "accidently" updated the wrong firmware.
Tektronix DPO 7000 series users? - Page 1
Forum section: electronics / testgear

author: Sighound36
author_rank: Frequent Contributor
timestamp: October 08, 2019, 08:53:30 am
content: Any Tek DPO7000 series regular users wishing to comment on these scopes as in day to day usage, GUI interactions, quirks and BW are these model hardware or software crippled?All feedback welcome.

author: joe
author_rank: Newbie
timestamp: September 05, 2020, 03:20:33 pm
content: Just picked up a DPO 7104 and unable to restore the Tek 2.0.11 firmware. Says not a DPO7000 series scope. I changed the systeminfo to be DPO7000 Series Oscilloscope but no success. Has someone been through this process to restore the firmware for TekScope DPO7104? Many thanks!

author: joe
author_rank: Newbie
timestamp: September 05, 2020, 03:32:40 pm
content: Quote from: joe on September 05, 2020, 03:20:33 pm
Tekway/Hantek LCD Panel - Page 1
Forum section: electronics / testgear

author: Mike Warren
author_rank: Unknown
timestamp: June 30, 2020, 10:22:18 pm
content: Does anyone know where to get a replacement LCD panel for a Tekway DST1102?

author: tautech
author_rank: Super Contributor
timestamp: June 30, 2020, 10:35:26 pm
content: Reseating the display ribbon cables is worth a try.

author: Microcheap
author_rank: Frequent Contributor
timestamp: June 30, 2020, 10:36:04 pm
content: The picture shows that the model is the AT070TN83, you can easily find it on Aliexpress or eBay.Note that some sellers sell the LCD diplay and the touch panel, you need only the LCD.

author: Mike Warren
author_rank: Unknown
timestamp: June 30, 2020, 10:41:31 pm
content: Quote from: tautech on June 30, 2020, 10:35:26 pmThanks for the reply. I've already tried that.

author: Mike Warren
author_rank: Unknown
timestamp: June 30, 2020, 10:47:27 pm
content: Quote from: Microcheap on June 30, 2020, 10:36:04 pmThanks for that. I just found one on eBay for $50, but from China so I might as well get one from AliExpress since they are about half that price.

author: tautech
author_rank: Super Contributor
timestamp: June 30, 2020, 10:47:50 pm
content: Quote from: Mike Warren on June 30, 2020, 10:41:31 pmBoth ends ?

author: Mike Warren
author_rank: Unknown
timestamp: June 30, 2020, 10:59:08 pm
content: Quote from: tautech on June 30, 2020, 10:47:50 pmYes. That's what I was hoping it was going to be. I had a problem with the display not long after buying it and reseating the ribbon fixed it.

author: Mike Warren
author_rank: Unknown
timestamp: September 07, 2020, 04:47:17 am
content: The replacement display finally arrived.
Tektronix DPO4104 self test errors. Repair attempt diary (referral) - Page 1
Forum section: electronics / testgear

author: analogRF
author_rank: Super Contributor
timestamp: September 05, 2020, 11:48:31 am
content: I have got a DPO4104 with acquisition errors and I have been talking only to myself here:https://www.eevblog.com/forum/repair/tektronix-dpo4104-self-test-errors-is-there-any-description-available/for days with no comment from anyone else, not even about the configuration and design of this scope which I posed a couple of questions about.so I thought maybe I started the thread in a wrong place.I don't want to repeat everything here, so please visit the above thread and go through the posts and leave comments if you have any.thanks
HP 1653b buyer advice  - Page 1
Forum section: electronics / testgear

author: AlexandruOprea
author_rank: Newbie
timestamp: September 04, 2020, 10:49:44 am
content: Hi!I have been looking to buy some older fairly cheap equipment to play with and learn some new stuff. I came across an HP 1653b scope/logic analyzer that comes with the probes, but there is a catch. It comes with a floppy disk for the 50b/51b/54b not for its actual model (according to the photos of the floppy disk and the front panel). Moreover, on the self test screen it shows that it failed the disk drive test (maybe it is caused by the mismatched floppy). I am buying it also for the probes because I want to see if I can use them on my SDS2000X plus MSO (I know I need an adapter). I want to know the opinion of other people who know this device, if it is worth it.I have downloaded a guide on burning a floppy for the 1652b version which has the same software as 1653b fromhttp://www.hp1652bmanual.com/,but I do not know if it is possible for me to do it. I know it might be a silly question but I haven't ever used a floppy.Thank you for your time!
Witschi Q Test 4000 - Page 1
Forum section: electronics / testgear

author: miffe
author_rank: Newbie
timestamp: September 03, 2020, 11:43:08 pm
content: I found this Witschi Q Test 4000 in the trash. It looked awesome so I picked it up.But what does it do?Also, my first post here so be gentle.

author: miffe
author_rank: Newbie
timestamp: September 04, 2020, 12:02:55 am
content: They have a support page where you can register the serial number athttps://www.witschi.com/en/support/create-account.htmlI just did, let's see what happens.

author: radiolistener
author_rank: Super Contributor
timestamp: September 04, 2020, 01:05:25 am
content: looks like quartz clock tester.Here is more new model:https://www.witschi.com/assets/files/sheets/Leaflet_qt6000.pdf
Keysight 34465A DMM stops working on power on  - Page 1
Forum section: electronics / testgear

author: limata
author_rank: Contributor
timestamp: August 28, 2020, 06:41:46 pm
content: Just power on my Keysight 34465A DMM and it takes much longer to boot. Once it boots, it displays "Firmware update failed. Current version is A.03.00". I didn't update the firmware so not sure where this is about. The meter cannot do any mesurements and some buttons are working but very slow response.Thanks for help.Wei

author: coromonadalix
author_rank: Super Contributor
timestamp: August 28, 2020, 08:07:43 pm
content: Have you tried to contact Keysight ? is it still under warranty ?

author: limata
author_rank: Contributor
timestamp: August 28, 2020, 08:29:36 pm
content: About 3 years old and it might not under warranty anymore. Issue a serivce ticket on Keysight website and haven't got any feedback in 2 days.

author: Grandchuck
author_rank: Super Contributor
timestamp: August 28, 2020, 08:42:57 pm
content: Have you unplugged it from the AC mains and then reconnected it. Some times this will elicit a different type of booting. Don't know if this is relevant to this meter, but sometimes it works.

author: limata
author_rank: Contributor
timestamp: August 28, 2020, 09:18:44 pm
content: Have tried that and reboot many times. Just check the website and it carries 3 year warranty. It migh still cover by warranty.

author: TheSteve
author_rank: Unknown
timestamp: August 29, 2020, 02:54:31 am
content: You could try a firmware update. Not something you always want to try on a machine that is having issues. But at the same time it might fix the problem.It can be updated via USB or via the network.

author: limata
author_rank: Contributor
timestamp: August 29, 2020, 05:01:19 am
content: I was able to update the firmware to the latest one. It wasn't easy. I rebooted a few times and every time different keys stop responding. Now, it's pretty much the same problem but it displays" "Firmware update failed. Current version is A.03.02". It actually recongises the new firmware but it still cannot do any measurements. It might be a hardware issue.

author: Electro Fan
author_rank: Super Contributor
timestamp: August 29, 2020, 03:21:36 pm
content: Keysight support answers the phone with real people. The hold time is generally minimal and while you might get switched from one person to another you will get to someone who either has the info you need or they will dig it up and get back to you. Hopefully it’s still in warranty. Good luck!

author: limata
author_rank: Contributor
timestamp: September 04, 2020, 07:02:39 pm
content: The DMM carries 3 years warranty. Keysight is going to do a warranty repair.

author: Electro Fan
author_rank: Super Contributor
timestamp: September 04, 2020, 07:10:49 pm
content: Cool!!
Rigol DSA815 without TG - Bootloader 1.04 how to enable features? - Page 1
Forum section: electronics / testgear

author: forgoden
author_rank: Newbie
timestamp: August 21, 2020, 05:43:39 am
content: Hello,I bought used Rigol DSA815 without TG from ebay and it has still 8h and 40 mins trial leftModel: DSA815mainboard: 00.09radioFPGA: 00.05digitalboardFPGA: 00.05firmware: 00.01.18boot: 00.01.04gotroot serials will not work.People said that I should connect pin 7 with 8, but I dont like it, because that means that all the store functions are not working after the mod, this is a big disadvantage of this mod.Is it possible to downgrade firmware using programs from peter.dreisiebner? Because I get totaly confused when I am reading this long topichttps://www.eevblog.com/forum/testgear/spectrum-analyzer-rigol-dsa815/Can someone make more clear steps here?

author: Wall-E
author_rank: Contributor
timestamp: August 25, 2020, 11:39:06 am
content: Quote from: forgoden on August 21, 2020, 05:43:39 amPLEASE -What is this about, and why do you think that there is something that won't work, or STORE in memory, after installing the FRAM Write Protect modification?I have used this Mod. for several years without seeing any issues, so I'm concerned about what I and others may have possibly (if anything) been missing. Thank you!

author: chronos42
author_rank: Regular Contributor
timestamp: August 26, 2020, 03:20:15 pm
content: Quote from: Wall-E on August 25, 2020, 11:39:06 amAs I wrote in another thread: System setups are not stored anymore after the mod, all other storage functions are still working. This is the disadvantage you have to live with, there is nothing for free...

author: Wall-E
author_rank: Contributor
timestamp: September 04, 2020, 12:17:56 am
content: This is why we use the 'FRAM Write Protect Switch' as described previously. With it all bases are covered and it provides the functionality to change the Rigol defaults to what ever available choice you want as your default. Of course turn the 'FRAM WPS' ON/OFF or OFF/ON with the DSA700/800 Series Powered OFF to Retain/Store Setting, Data, and Option Trial Times. This information has all been provided with details.
HP 54201A/D scope - Page 1
Forum section: electronics / testgear

author: stj
author_rank: Super Contributor
timestamp: May 20, 2017, 04:04:15 pm
content: what is one worth these days?i may add one to my collection of old scopes if they are cheap enough.

author: nikodem
author_rank: Regular Contributor
timestamp: September 03, 2020, 12:09:52 pm
content: I am fully aware, that this post is old, but the scope in the topic is much older. I have a chance to buy this scope (54201A) for approx 150 EUR, which seems like a bargain..? or does it?

author: precaud
author_rank: Frequent Contributor
timestamp: September 03, 2020, 12:34:24 pm
content: Seems pricey to me for a slow, 6-bit DSO with a clumsy user interface. The 545xx series were much improved.

author: merox
author_rank: Regular Contributor
timestamp: September 03, 2020, 06:30:47 pm
content: Quote from: nikodem on September 03, 2020, 12:09:52 pmHoly crap, that's way too expensive for that scope. I wouldn't pay more than like 50 € or sth. for that thing. And I have to say that as an owner of a 54200A.It works fine for me, but as mentioned by precaud it uses a 6-bit ADC so I wouldn't really recommend it for "serious" analog stuff. For working on mostly digital circuits it works fine though as soon as you get used to the user interface since there are no knobs to turn, only arrows and numberpad to enter values like trigger levels etc. But really: 150€ is waaaaay tooo much.Quote from: nikodem on September 03, 2020, 12:09:52 pmThat's true and they should be in the same price range as the 54201A. The usability is greatly improved due to the "scroll wheel" thingy it has, it makes usage much nicer. But at all cost avoid the 54501A. It has a sample rate of miserable 10 Megasamples per second which makes it usable to about 1 MHz on non repetitive signals which is the most common use case.In this case the 54201A is way better since it has a sample rate of 200 Megasamples per second which makes it usable to about 20 MHz on non repetitive signals (HP says 50 MHz in their datasheet). So if you would have to choose between both of them at the same price, I'd go for the 54201A.
Atten AT6011 Died... - Page 1
Forum section: electronics / testgear

author: Geeky907
author_rank: Newbie
timestamp: June 17, 2015, 12:01:19 am
content: I've had my AT6011 for a couple years, and the other day while taking a measurement it just flat blinked out... totally dark, no signs of life... i've opened the case and i dont see any blown fuses or obvious death signs, i was wondering if anybody has a line on any kind of schematics or service manual for this "One-Hung-Lo" basic Spec-An. Would sure like to get her back up and running i have some stuff to use it for, and not really the spare cash to drop on a new equivelent.Thanks Everyone- Mike

author: tautech
author_rank: Super Contributor
timestamp: June 17, 2015, 08:03:36 am
content: Probably a PSU failure, is it a SMPS?Is the PSU on a seperate PCB?Have you checked for any voltages?Have you emailed Atten? Just email sales, they have been quite helpful for me when needed.I'm not sure if they offer a 3 year warranty like Siglent.They'll need to know the SN.I'd be checking all this out and maybe contact them for a replacement PSU if you don't have the gear or skills to fix it.

author: Pinkus
author_rank: Frequent Contributor
timestamp: June 17, 2015, 11:48:26 am
content: I am not 100% sure but were'nt these Atten Spectrum analyzer clones of older Hameg Spectrum Analyzer?Maybe you can find some Hameg docs easier.

author: Hydrawerk
author_rank: Super Contributor
timestamp: June 17, 2015, 10:12:51 pm
content: It looks like a rebadged (?) Hameg spectrum analyzer.

author: Hydrawerk
author_rank: Super Contributor
timestamp: June 17, 2015, 10:30:54 pm
content: At least it is inspired by some Hameg spectrum analyzers.

author: bigpimp347
author_rank: Newbie
timestamp: May 26, 2020, 08:10:27 pm
content: sorry to drag this back up..any outcomejust bought one via eBay for a few quid.worked great for an hour or two,went on the tracking generator, worked once.tried something else, went back to TG and the LCD display faded, screen went off.switched off and the unit came back on, s soon as TG is switched on fade and well..did this a load of times..checked inside.found some poor soldering,well lots.a dodgy transistor and wire.and a bit of enabled wire from the power socket (front panel board) to the TG switch.i was thinking maybe this was chafing on the screw of something.moved it so it touches nothing.reflowed some solder as it was bad, tidied it up a bit.but all i get now is a faded LCD and no main screen..i can't find a service manual any where,contacted Atten but nothing yet.also mines only three years old 2017 board print.looking at maybe the voltage regulator but need voltages to compare.any one?thanks...

author: Forest1394
author_rank: Newbie
timestamp: September 12, 2020, 04:46:20 pm
content: Hi. Did you fix it? I have fixed the very similar problem on mine.
Continuity test on live circuit - Page 1
Forum section: electronics / testgear

author: lightspeed
author_rank: Newbie
timestamp: August 27, 2020, 04:43:19 am
content: I was using my Fluke 117 to test for continuity between a light switch hot wire and another outlet hot. I noticed it stayed ringing even after the probes were removed for a second or two.I do understand in retrospect that continuity tests should not be done on energized circuits.Is it possible I've damaged the Fluke or somehow compromised its accuracy?Thanks in advance

author: Fungus
author_rank: Super Contributor
timestamp: August 27, 2020, 05:03:51 am
content: There's a component inside (called aPTC) in it that heats up under stress and protects the meter when it gets hot enough.It has to cool down again for the meter to return to normal and that takes a while.Quote from: lightspeed on August 27, 2020, 04:43:19 amYes, PTCs wear out, but it's not very likely if you only did it once.

author: David Hess
author_rank: Super Contributor
timestamp: August 28, 2020, 12:18:07 am
content: I do not know what the Fluke 117 is doing that would cause that, but before we had PTCs, multimeters used other methods to protect their ohms converter circuit which did not have any cool down time.

author: lightspeed
author_rank: Newbie
timestamp: September 03, 2020, 01:53:43 pm
content: Thank you I feel more confidence in my equipment now
Anritsu Wiltron VNA 372xx BBRAM content for figuring out options - Page 1
Forum section: electronics / testgear

author: Staffan321
author_rank: Regular Contributor
timestamp: July 08, 2020, 07:24:17 pm
content: Hello,This is sort of a cross post, but since response on this group has been very good I'm taking my chances...I have a 37247A VNA and would like to see if it would be possible to figure out how different options may be stored in the BBRAM. If anyone has the content of their BBRAM available, it would be great if they could share the content. I'm especially interested in figuring out the time domain option and the 1 Hz resolution option.Of course, if anyone can tell a little more about the structure of the BBRAM or how options are stored, that would be even better!Regards,Staffan

author: eevcandies
author_rank: Regular Contributor
timestamp: September 03, 2020, 08:35:30 am
content: You might take a look here.....never knowhttps://www.eevblog.com/forum/testgear/anritsu-ms860xa-(and-likely-ms268xa)-options/msg2821740/#msg2821740
Insulation Tester ("Megger") Vici VC60B+: confusion about E and L terminal? - Page 1
Forum section: electronics / testgear

author: RK_aus_S
author_rank: Contributor
timestamp: July 24, 2019, 08:55:58 am
content: HelloLike some here, if bought this cheap Chinese Insulation Tester "Vici VC60B+" from AliExpress.There a controverse manuals available concerning theEandLterminal usage, you can read either:E: Input terminal for the measuring object.L: Terminal for connecting to the GND of the measuring object.or vica-versa:L: Input terminal for the measuring object.E: Terminal for connecting to the GND of the measuring object.When I measure the output ot this two terminals, I can see thatL is the positive (+)terminal andE is the negative (-)terminal.I assumeEstands forEarth andLstands forLine(?)If I use this terminals this way or vica-versa, I wonder if that does not matter at all? Or is important in some cases? Or is important in any case?Thanks

author: 001
author_rank: Super Contributor
timestamp: July 24, 2019, 07:29:00 pm
content: Insulation is only piece of dielectric materialso polarity is insignificant

author: bob91343
author_rank: Super Contributor
timestamp: July 24, 2019, 07:55:36 pm
content: E stands for Earth. L stands for Low. Is there an H for High terminal?

author: Neilm
author_rank: Super Contributor
timestamp: July 24, 2019, 08:31:49 pm
content: Quote from: 001 on July 24, 2019, 07:29:00 pmDepending on the application the polarity can be significant - especailly if you are charging and discharging dielectric.Normally, insulation testers are used by connecting the positive to earth and the negative to the other end - this may be why the tester is marked as it is. The E terminal could be the positive for connection to earth.If there is a third terminal then one of these is the Guard terminal used for guarding out surface leakage current.

author: RK_aus_S
author_rank: Contributor
timestamp: September 03, 2020, 08:55:19 am
content: QuoteThanks, that seems to be the right answer.In summary:Estands forEarth; should be connected (mostly with the red lead) to the Earth/Ground/outer Isolation of the Device/Conductor under Test.Lstands forLine; should be connected (mostly with the black lead) to the Device/Conductor under Test.Gstands forGuard; (if necessary) should be connected (mostly with the blue lead) to the surfacebetweenE and L to intercept/shunt out parallel, surface leakage current.Regards
Erie Instru-mation dekatron counter - Page 1
Forum section: electronics / testgear

author: xymox
author_rank: Contributor
timestamp: September 02, 2020, 10:44:47 pm
content: I have a tube based frequency counter. Also a nice oscillator I got working.. I am pretty proud of these wonderful looking devices..https://www.youtube.com/watch?v=FuC_x1ZUPXk&feature=youtu.behttp://www.xymox1.com/Projects/erie_instrumation_model_400.htm
Tektronix DPO7104 restore - Page 1
Forum section: electronics / testgear

author: joe
author_rank: Newbie
timestamp: September 05, 2020, 03:37:05 pm
content: Looking for some guidance to restore my DPO7104 after HD replacement (which aged out..) and PC memory replacement (flaked out)The scope boots into Windows XP SP2 fine with front panel display. But..when attempt to restore the Tek firmware unsuccessful..Installing the "TekScope_5_3_5_22_Firmware_066079844.exe" from Tek website.Any guidance appreciated! Thanks advance..
manual for CSC Model 3001 Capacitance Meter? - Page 1
Forum section: electronics / testgear

author: Stray Electron
author_rank: Super Contributor
timestamp: April 29, 2016, 01:32:09 pm
content: I picked up one of these a few days ago from a load of equipment that was going to be scrapped. It still works but I'd like to find a manual for it. It has a 5 pin DIN socket on the back that I think was used for some of the other optional parts that allowed it to bin components by value. These were made by CSC (Continental Specialty Corp) in about 1980 they were later taken over by, or changed their name to, Global Specialties sometime after 1980. Photo of one (not mine) shown below.Anybody have a manual or a schematic for one of these?

author: Chris Haynes
author_rank: Newbie
timestamp: January 14, 2018, 09:41:29 pm
content: I picked up one of these also ($20). Looks well made. Worked for a while and now mostly doesn't. Trips GFI when turned off; very dim or no display. Looks like a power supply issue. Could use a schematic also.

author: coromonadalix
author_rank: Super Contributor
timestamp: January 14, 2018, 11:06:14 pm
content: Maybe opening the case and take a picture for us would help, could be based on intersil 7106 7107 designs ? or ca3161 ca3162 ic's too ?

author: JacobsMess
author_rank: Newbie
timestamp: January 10, 2020, 11:04:13 am
content: I actually got thec manual from RS components. I can upload it if it's still of use?

author: worsthorse
author_rank: Super Contributor
timestamp: February 16, 2020, 04:05:47 pm
content: if you are still willing to upload the manual i could use it. thanks.

author: Grotsoft
author_rank: Newbie
timestamp: May 26, 2020, 11:56:11 am
content: Hi,I just re-discovered my 3001 and am also looking for a copy of the manual. I can only find a couple of blurry pictures of the schematic online.If you ever got one I'd appreciate you posting it.thanks

author: linearphase
author_rank: Contributor
timestamp: September 02, 2020, 05:12:37 pm
content: I could use a copy as well, can you email?
Agilent ESA-E Spectrum Analyzer personality keys - Page 1
Forum section: electronics / testgear

author: xymox
author_rank: Contributor
timestamp: September 02, 2020, 05:00:06 am
content: So.. I have a fairly fully loaded E4402B with a tracking gen and about every option.. I want to add some personalities I dont have.I can download the software from Keysight.. BUT I need a licensing key.. My guess is these keys are not verified ? and I could use a key I obtained from another unit ? Or are they generated for each serial number ?As these units are everywhere, I would like to get a web site together that has all the software and all the keys.. Maybe I can even figure out how to make a key gen if its based on the serial number of the unit..Does anyone have any experence with this ?This project would help out everyone like me with one of these at home and provide a lot more functions for each unit.I have attached my unit pic from System > More > More > Licensing > SHow license.. If someone wants to send me their screen shot of that page with ANY different personality I can check if I can install of that same key..

author: tv84
author_rank: Super Contributor
timestamp: September 02, 2020, 08:27:07 am
content: Continuehere.