hybridfree/eevblog-posts huggingface dataset:
HP 8481D power sensorand 11708A reference attenuator. - Page 1
Forum section: electronics / testgear

author: ytterligare
author_rank: Regular Contributor
timestamp: April 02, 2021, 11:09:25 pm
content: Never owned any power meter, got one ( Agilent E4418B ) from one eBay source and a sensor from another eBay source last week.The sensor arrived yesterday, and, besides the musty stench, I noticed that the reference attenuator mentioned in the user guide ( 11708A 30dB ) was missing.Now, I believe this sensor was used years ago by a professional knowing what he's doing or at least I hope so, but what if the seller never used the attenuator to calibrate...?Is it really that sensitive to require this attenuator ? English is not my first language and the manual says that the attenuator "SHOULDbe connected" prior the calibration, which is confusing me...Thanks for any opinion...A.P.S. the probe data :HP 8481D -> 10 Mhz to 18 Ghz100 pW to 100 µW ( -70 dBm to -20 dBm )

author: xmo
author_rank: Regular Contributor
timestamp: April 03, 2021, 03:26:34 am
content: The calibrator in the power meter outputs a 50 MHz signal at a very accurate milliwatt level (0 dBm)The 11708A 30 dB attenuator is used to calibrate the 'D' model sensors at 1 microwatt.The 11708A 30 dB attenuator is a special model manufactured to be extremely accurate at 50 MHz.You can use another high quality 30 dB attenuator - it just may not be quite as accurate.

author: jjoonathan
author_rank: Frequent Contributor
timestamp: April 03, 2021, 04:06:04 am
content: Yes, but could the 0dBm signal fry the sensor?I have wondered that too. My guess would be no, and that the -20dBm limit is about keeping the diode(s) in the quadratic region rather than avoiding damage, but that's just a guess and not a basis for staking (price of power sensor) on it.

author: Tony_G
author_rank: Super Contributor
timestamp: April 03, 2021, 05:24:37 am
content: For the 8481D the max power is 100mW avg or pk so the 0dBm cal won't hurt it. However, as jjoonathan mentioned it is only accurate to 10μW and once it goes outside of the square-law region it is no longer accurate.Those 11708A attenuators come up on eBay fairly often and they aren't matched to a given sensor so you can pick one up.TonyG

author: ytterligare
author_rank: Regular Contributor
timestamp: April 03, 2021, 04:43:54 pm
content: Thank you, I was able to get an 11708A used, at a fair price.Interesting info tho, make me use the sensor with more confidence.CiaoAndrea
HP 33120A 15Mhz Function Generator square wave  - Page 1
Forum section: electronics / testgear

author: Helix70
author_rank: Unknown
timestamp: April 03, 2021, 11:27:34 am
content: Hi Guys,I have an HP 33120A 15Mhz function generator. I was trying the square wave output into a 50 ohm load at the DSO (output set to 50 Ohms also, 1V p/p) and it looks pretty rubbish at higher frequencies.Is this the same for others, or is mine broken? Below is 1Mhz, 10Mhz and 15Mhz respectively. Looks like the output filter is in circuit, but why for a square wave?Josh

author: capt bullshot
author_rank: Super Contributor
timestamp: April 03, 2021, 11:37:40 am
content: Mine looks basically the same. The output amplifier isn't fast enough for a 15MHz square wave. You'll find that behaviour on many function gens, the highest frequency square wave looking more like a sine.

author: David Hess
author_rank: Super Contributor
timestamp: April 03, 2021, 11:53:39 am
content: That sort of performance when making square waves is typical for a function generator because of limitations in the linear output amplifer. A pulse generator is more suitable if you require cleaner square waves.

author: Helix70
author_rank: Unknown
timestamp: April 03, 2021, 11:57:07 am
content: Thanks Guys. I mainly use it for sine waves and the odd arb, but was trying to use it for a clock on a micro. Might need a comparator to square it up a bit.

author: capt bullshot
author_rank: Super Contributor
timestamp: April 03, 2021, 12:05:14 pm
content: Just use the sync output for that.

author: Helix70
author_rank: Unknown
timestamp: April 03, 2021, 12:24:37 pm
content: Great idea. I just tried it and thats a good solution. I will need to deal with the amplitude as it is fixed between 3 and 4.5 volts, but even the duty cycle works.
Anyone work at Fluke or know someone who does? - Page 1
Forum section: electronics / testgear

author: dorkshoei
author_rank: Frequent Contributor
timestamp: March 05, 2021, 07:04:20 pm
content: Weird question I realize.I'm trying to get in contact with someone who works at Fluke. Ideally someone senior.I'm trying to get authorization for the release of an old training manual from the late 1980s. I know where the manual is but the person who possesses it won't release without Fluke auth. The class was only given once, to 10 people, so another copy is unlikely to show up.I figure trying to contact Fluke legal directly is pointless and I need some "inside help".I don't want to go into more details on what the manual is, or what the course was.If you think you can help,please PM me (click here)

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 02, 2021, 05:56:22 pm
content: Bump. Anyone?

author: coromonadalix
author_rank: Super Contributor
timestamp: April 02, 2021, 06:49:29 pm
content: have you tried different country Fluke service center(s) ?

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 02, 2021, 06:57:04 pm
content: Quote from: coromonadalix on April 02, 2021, 06:49:29 pmI don't mean to be rude but this isn't going to work. It's also not answering the question I asked.

author: KE5FX
author_rank: Super Contributor
timestamp: April 02, 2021, 07:27:21 pm
content: Why don't you believe that contacting the legal department will be helpful? That's exactly what was done to secure permission to copy and distribute unsupported Tektronix manuals a number of years ago. The company's chief IP counsel provided anon-exclusive license to copy and distribute obsolete publications, and that was the end of it.I'd suggest getting in touch with their legal department and ask if they would be willing to agree to the language found in the Tektronix release. Fluke and Tektronix have a common parent company now, so you could basically write toFortiveand propose that they adopt the same license for all of the individual T&M equipment companies under their control. It's not an unreasonable thing to ask, especially since Tektronix's legal department already did the work of drafting the license. If they say "No," then you can try contacting Fluke's own legal department.

author: joeqsmith
author_rank: Super Contributor
timestamp: April 02, 2021, 07:52:06 pm
content: I contacted Fluke's legal department to grant permission for me to digitize a VHS training tape and make it available free of charge on the internet. They were very helpful.

author: dorkshoei
author_rank: Frequent Contributor
timestamp: April 02, 2021, 07:58:35 pm
content: I just reached out to them. I should have years ago. They pointed me to the person to talk to.Thanks everyone. I assumed it would be a royal PITA and I'd need "inside help".Thank you all again. I'll followup with how I get on.
Rohde & Schwarz SMS Signal Generator parts wanted - Page 1
Forum section: electronics / testgear

author: Helix70
author_rank: Unknown
timestamp: April 03, 2021, 11:51:53 am
content: Hi Guys,I have just acquired my first boat anchor, a Rohde and Schwarz SMS Signal Generator 0.1-520MHz in working condition, but it is missing a key cap, one of the stand plastic side caps is broken, the power switch mechanism is broken and RCL button falls off when pressed. I would love to restore the unit if I can find the parts, as the signal quality is still great.Anyone got and old parts unit sitting idle with some parts to share? I also believe there is a frequncy doubler option for it to go to 1040Mhz. If you have that board lying around, I could give it a good home.Thanks,Josh
Spare for multimeter Finest 7130 wanted - Page 1
Forum section: electronics / testgear

author: Neper
author_rank: Frequent Contributor
timestamp: April 03, 2021, 11:57:27 am
content: The foil covering the keys of my multimeter is disintegrating. Finest have no spares. Does anyone know of another source or have a 7130 that's broken and can be had for parts?Ralf
Fluke 289 "Si"? - Page 1
Forum section: electronics / testgear

author: hendrick
author_rank: Newbie
timestamp: September 21, 2016, 04:29:11 pm
content: Does any one know what the marking on this Fluke 289 FVF multimeter stands for?It appears to say "Fluke 289 Si TRUE RMS MULTIMETER" on the screen bezel.It looks like an "Si" to me, but I don't have another photo...

author: Marco1971
author_rank: Contributor
timestamp: April 03, 2021, 10:46:59 am
content: Hi, this is a review of Fluke 289 SìMarco

author: Wytnucls
author_rank: Super Contributor
timestamp: April 03, 2021, 09:37:17 pm
content: Asian market 289. Temperature in degree C only. No F.

author: Hydrawerk
author_rank: Super Contributor
timestamp: April 03, 2021, 10:49:53 pm
content: Is itSifor Sinology?https://en.wikipedia.org/wiki/Sinology

author: Arhigos
author_rank: Regular Contributor
timestamp: April 04, 2021, 12:31:45 pm
content: This is for Japan only. It cannot measure F, only C. No other difference
Drift of thermocouple elements - Page 1
Forum section: electronics / testgear

author: Roman oh
author_rank: Regular Contributor
timestamp: April 02, 2021, 10:12:10 am
content: I have finally dusted off my Fluke 540B, and made a little battery eliminator, and have started playing with it. Having satisfied myself that all the circuits are working correctly, I watch it in DC transfer mode (DC from a Fluke 332B which I am confident is far more stable than the effect I am about to describe). The unit nulls correctly, reversal error with the original thermal element is within spec, but over a period of several minutes, the null detector needle drifts to the left - about 5-10 minutes to end of scale in high sensitivity mode (about 0.01% of FS).If I apply 7mV from a stable source in lieu of the thermocouple, the reading remains rock solid. The reversing switch in the A54 appears to be repeatable and work as expected.Now, I happen to have a small number of vacuum mounted thermocouple elements and octal bases in my “junk box” (some look unused, till now) so I made up some adapters and tried some of these plugged into the socket of the A54 voltage unit of the 540B. To a greater or lesser extent, they ALL seem to show some drift over a period of minutes - some positive, some negative. As Murphy would have it, the one with (almost) imperceptible drift also has a shocking reversal error.Is this a common issue with vacuum mounted thermocouple elements? Is my small cache just junk? Or should I be looking elsewhere for something?Appreciate any help or advice.
HP 1707B Scope - No Horizontal Sweep - Page 1
Forum section: electronics / testgear

author: DaddyMac
author_rank: Newbie
timestamp: April 02, 2021, 07:09:09 pm
content: Vertical sweep appears to work. All push buttons OUT (auto sweep mode), 10:1 TEK probe connected to CAL output, A Input on AC, 0.1 v/div. With sweep mode in EXT HORIZ or DELAYED, I get 2 dots 1cm apart (height) on the screen. The height tracks the Volts/Div. In MAIN or MIXED, no display. Both Horiz and Vertical position adjustments work. I do not have another scope (that works), only a DVM and counter. I do not have the extender boards needed check voltages, etc. So it looks like all I can do is pull the likely circuit boards for inspection and to check resistors, replace any likely capacitors and perhaps shotgun some likely failed transistors. Any suggestions? I have the HP Operating and Service Manual on CD and some hard copies (can make more). I do have an HP 1703A scope for parts, but little or no common boards.
TEKWAY DST1102B Won't Start When Cold - Page 1
Forum section: electronics / testgear

author: Talbot
author_rank: Newbie
timestamp: March 31, 2021, 07:16:15 am
content: I have a Tekway DST1102B oscilloscope and it has trouble starting up. The front panel flickers and I can hear some relays clicking but the screen has trouble firing up. If I persist it will eventually start. It's obviously temperature related. The fault could be anywhere. I want to check and see if anyone has a solution before I go poking around. Thanks in advance for your help.
Tek 2467B Options - Page 1
Forum section: electronics / testgear

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: March 29, 2021, 07:18:22 pm
content: Do any of you know how options are implemented on the 2467B? Specifically, is the counter option in the ROM firmware, or is there circuitry associated with it? I have a parts mule with counter option that I would like to implement in another.

author: ps
author_rank: Regular Contributor
timestamp: March 29, 2021, 09:30:19 pm
content: Counter and/or TV trigger is an extra PCB sitting between power supply and CPU board. There might be a Lemo socket at the back for an optional word recognizer trigger probeGPIB is a smaller PCB left to the PSU. Both GPIB and CTT options are connected to the CPU board with a 40 pin flat cable on the top.

author: Ground_Loop
author_rank: Frequent Contributor
timestamp: March 29, 2021, 09:45:13 pm
content: Quote from: ps on March 29, 2021, 09:30:19 pmI see it now. Thanks. So, If I pull this board out and put it in another scope do you know if there are any enabling jumpers or settings to make it active?

author: Testtech
author_rank: Regular Contributor
timestamp: April 01, 2021, 12:13:11 am
content: The CPU will recognize the options, but note that the boards are s/n range specific.
Does the Bryman BM235 Sensor Ambient temp when using the K type probe? - Page 1
Forum section: electronics / testgear

author: Qmavam
author_rank: Regular Contributor
timestamp: March 31, 2021, 02:55:19 pm
content: I'm confused about using the K type probe on my multimeter. But I understand that if the meter has an RTD to measure the cold connections, a correction can be made in the meter to make it read correctly. Does the Bryman BM235 do this making for no need to be concerned about ambient temperature. To illustrate my point, I have a sauna, if I take the meter inside and the meter itself is 180*F, will it measure floor and ceiling temps correctly if I leave the meter at the 180*F height?OK, my illustrative point is moot, because the operating temp is 14*F to 113*F, (-10*C to 45*C)But it does go to the point of my question.Unneeded info, I'm curious about heat stratification in my sauna, I'm amazed at the difference between the floor temp and ceiling temp and want to quantify it.

author: Qmavam
author_rank: Regular Contributor
timestamp: March 31, 2021, 03:07:57 pm
content: I just reviewed Dave's thermocouple video,It leads me to believe that most decent meters do have the compensation built into the meter.So, I think the Bryman BM235 will have that. If you have more information please post it.Thanks, Mikek

author: wraper
author_rank: Unknown
timestamp: March 31, 2021, 03:17:21 pm
content: It's not certain if it will compensate for such high temperature and how accurate it will be. However I do not suggest bringing meter into such ambient temperature at all. You may damage LCD, and stickers or anything else holding on adhesive likely will come off. If you want to make measurements, buy a long thermocouple if existing is not long enough, and keep the meter out of sauna.

author: Qmavam
author_rank: Regular Contributor
timestamp: March 31, 2021, 04:13:52 pm
content: Quote from: wraper on March 31, 2021, 03:17:21 pmYes, I noted the operating temp of the meter is limited to 113*F .
Hantek clamp meters no effect on waveform - Page 1
Forum section: electronics / testgear

author: Roverfan
author_rank: Contributor
timestamp: March 28, 2021, 11:20:31 pm
content: Hi I am newb with oscilloscopesDelighted to have just taken delivery of a hantek 6074be a few days ago. Got it to display the 1khz waveform no probs...... When trying to use the hantek amp clamp meters cc65/cc650, the meters have little to no effect on the displayed waveform even when meters are turned off. It has a waveform and the Vrms sometimes shows uV and sometimes mV all by itselfRight now it's showing Ch1:Vrms 6.58mA but moving around, zeroing clamp has no effect (sometimes it does have an effect but only a temporary effect)Is this user error? Or something else?

author: Roverfan
author_rank: Contributor
timestamp: March 29, 2021, 03:54:12 pm
content: Had a measure of the output of the clamp meter cc65 with a multimeter, its definitely not working as it should. It zeros OK but then starts floating immediately . Also it's output is not effected by what it's measuring. The biggest reaction you can get from it is by opening and closing its jawsScope is a bit suspect too, if you unplug the clamp meter it continues to show similar readings on the screenIf I'm missing anything please let me know. This is my first time using such equipment

author: Roverfan
author_rank: Contributor
timestamp: March 30, 2021, 08:36:26 pm
content: ResolvedIn a word User errorEmbarrassingly I was not measuring a single conductor wire.

author: tautech
author_rank: Super Contributor
timestamp: March 30, 2021, 08:44:32 pm
content: You won't do that again !You can increase the sensitivity of current probes by wrapping the conductor around the head and passing it through the clamp again to double the sensitivity however you need be careful not to overload the current rating of the clamp and damage it.
Siglent sds1102cnl start up stuck even with math pressing  - Page 1
Forum section: electronics / testgear

author: Sermad
author_rank: Newbie
timestamp: March 27, 2021, 10:45:53 pm
content: Hi allMy scope siglent stuck in siglent screen ! Ihave been read some topic simillar to my issue and tried press math button butDidnot fix my issue ! Isthere other way?Thank advance

author: tautech
author_rank: Super Contributor
timestamp: March 28, 2021, 03:13:23 am
content: Welcome to the forum.It is important Math is pressed rapidly and repeatedly from the moment of turn ON.Try several times.

author: Sermad
author_rank: Newbie
timestamp: March 28, 2021, 07:58:28 am
content: thanks taui will try and back later

author: Sermad
author_rank: Newbie
timestamp: March 28, 2021, 07:34:40 pm
content: Hi guysI tried alot of several time pressing math but didnot success is there apother way like recovery or reflashing

author: tautech
author_rank: Super Contributor
timestamp: March 28, 2021, 07:41:32 pm
content: Can you please confirm the model SDS1102CNL or SDS1102CNL+ ?

author: Sermad
author_rank: Newbie
timestamp: March 28, 2021, 07:46:00 pm
content: It is sds1102cnl+

author: tautech
author_rank: Super Contributor
timestamp: March 28, 2021, 07:54:51 pm
content: Quote from: Sermad on March 28, 2021, 07:46:00 pmAhh, quite different.I don't have the CNL+ recovery package but will try and get it today from the factory....don't go anywhere but it might be 12 hrs or so before I get a reply.Send me a PM with your email and I'll be in touch later.

author: Sermad
author_rank: Newbie
timestamp: March 28, 2021, 09:00:01 pm
content: Tautech thanksBut i newbie so have no idea what pm how can send can explain to meOr other wayThanks

author: tautech
author_rank: Super Contributor
timestamp: March 28, 2021, 09:33:12 pm
content: Quote from: Sermad on March 28, 2021, 09:00:01 pmPM is personal message using the forum however I have sent you mail so now you can edit your last post and remove your email.

author: Sermad
author_rank: Newbie
timestamp: March 28, 2021, 09:45:59 pm
content: Thanks and sorry to breaking secure restriction

author: Sermad
author_rank: Newbie
timestamp: March 30, 2021, 07:41:00 pm
content: Dear tautech i really appreciate your time and effort , the recovery pack successed and my scopeStart again thanks for you and for the eevblogSolved

author: tautech
author_rank: Super Contributor
timestamp: March 30, 2021, 07:56:38 pm
content: Quote from: Sermad on March 30, 2021, 07:41:00 pmGot your email.Good work.Enjoy.
HP 8566B vs 8563E any major performance differences? - Page 1
Forum section: electronics / testgear

author: jplle
author_rank: Contributor
timestamp: March 29, 2021, 04:31:34 pm
content: I am looking to buy either of these models for home lab. Mainly for preliminary EMI emissions testing, pre-compliance and RF experimentation.Other than the 1Hz minimum on the 8563E, is there any major performance differences? I don't care about weight, portability, or noise. I'd like higher reliability/repairability.Looks like the 8563E will cost about 500-1000 more than the 8566B.Anyone with experience? Thanks!

author: tkamiya
author_rank: Super Contributor
timestamp: March 30, 2021, 03:40:05 am
content: That's really not a fair comparison....8566B is a top-of-the-line 22GHz Spectrum Analyzer from 1980ish.8563E is a portable 22/26.5GHz and much more recent unit. I think the most recent version came with LCD display from factory.In US, we can find a good working unit of 8566B for $1000US, and 8563E for a bit more than $3000.Minimum bandwidth of 8566B is 10Hz. 8563E is 1Hz but it's digitally enhanced.8593E is quite a bit cheaper and still covers 22/26.5GHz. (depending on options) but bandwidth is limited to 1KHz. But an option can take it down to 30Hz.I think reapir-ability of 8566B is great but because of age, reliability is lower. It is getting harder to find a unit with bright enough CRT.Is this for hobby or work? If budget is not an issue, I'd be inclined to buy something quite a bit more recent. None of these are supported by HP/Agilent/whatever anymore. You'll have to rely on third party and eBay will be source of parts. Be careful with ones that lowest frequency is below few KHz.... these are DC coupled. It will NOT tolerate any DC input.8591EM comes with emission testing option already included. (limited to 1.8GHz)
Rigol VS5102D hack/VS5202D firmware - Page 1
Forum section: electronics / testgear

author: nihonjin
author_rank: Newbie
timestamp: March 28, 2021, 06:56:51 pm
content: Hello everybody, I'm... new here (well not exactly) since I don't remember my old account, and I know that as a presentation of oneself isn't apropiate to be asking for something, but it's what I need.I do work in a little sat company and the other day, one client gifted me with an oldy Rigol VS5102D usb oscilloscope/digital analyzer. Then I started looking for info about hacking/converting it into a VS5202D since both share the same guts, but I wasn't able to find any information about hacking this model nor a download link for the VS5202D's firmware.Does anyone here have one and did hack it? thanks a lothttps://sigrok.org/wiki/Rigol_VS5000_serieshttps://www.batronix.com/shop/oscilloscopes/Rigol-VS5202D.html

author: nihonjin
author_rank: Newbie
timestamp: March 29, 2021, 03:27:58 pm
content: Well, rigol replied my mail and here you have the firmware:https://www.dropbox.com/sh/sl91l77m91rzm6u/AAAKmlxeZDHAJPTnNz20I7dYa?dl=0
Entry Level Tenma Oscilloscopes - worth the buck? - Page 1
Forum section: electronics / testgear

author: astrocyte
author_rank: Newbie
timestamp: March 29, 2021, 07:47:15 am
content: Hi Dave and everyone! First and foremost - thank you for the inspiring content and the effort you put in your videos! I'm considering oscilloscopes in the <£500 range and I came across the Tenma 72-14530 UK. I was unable to find any elaborate reviews of this scope, but just looking at the datasheet and user manual, it looks promising. The menus are laid out professionally with plenty of screen estate for the waveform, the protocol decoder looks very decent (though I'd mostly use a logic analyser for this, I do appreciate this feature on the scope). The measurement menu also seems to have received the necessary attention from its creators, just like the statistics display below the waveform. 70Mhz is plenty for what I need, so I don't worry too much about the sample rate either. I'm more about the 4 channels and math and statistics.Previously, I've used a Rigol DS1054Z and I think the statistics display was worth all the money. Now I have a Hantek DSO5102P, and, well... yeah. I'm considering the Tenma scope, going back to the Rigol DS1054Z or a Siglent SDS1104X-E (I'm mostly in favour of this, because of the MSO and bode plot). I wouldn't want to request another video review for an entry-level scope, but I'd appreciate your thoughts on this, if anyone has experience using it.

author: modoran
author_rank: Regular Contributor
timestamp: March 29, 2021, 07:54:54 am
content: Never buy Tenma, they don't make anything, just rebadges from somewhere else and add to the price. That model is most likely an Owon scope, can't figure out right now which model it is exactly. Most likely you will find cheaper by the original name.

author: astrocyte
author_rank: Newbie
timestamp: March 29, 2021, 08:02:05 am
content: Indeed, many thanks!

author: Wytnucls
author_rank: Super Contributor
timestamp: March 29, 2021, 09:41:55 am
content: Tenma rebadges a lot of Uni-T products.This one is probably the UNi-T UPO2074CShttps://www.reichelt.com/de/en/digital-oscilloscope-70-mhz-4-channels-ultra-phosphor-upo-2074cs-p239599.html?r=1
Rigol DS1104Z resolution across the voltage ranges - Page 1
Forum section: electronics / testgear

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: March 28, 2021, 10:53:52 am
content: Hi! so just to see what shape the mains voltage was, out of curiosity, i decided to probe mains voltage with my oscilloscope, and found it strange that it looked quite blocky, especially when compared with smaller signals, I've read that to get the most out of the adc in the oscilloscope, one should try to fit the signal across the entire display. I tried this with the mains voltage and it was even blockier than it looks in the attached picture. the one with the circles marking the blockiness is the mains and the other one is the probe compensation signal zoomed in vertically and horizontally, and it doesn't look nearly as blocky. So now i wonder, does the oscilloscope have less vertical resolution in the higher voltage ranges? and if not, why am i seeing such a blocky signal? Thank you!

author: Fungus
author_rank: Super Contributor
timestamp: March 28, 2021, 11:26:29 am
content: Leaving aside the very real dangers of clipping a grounded crocodile clip onto mains wires, it's all going to depend on the oscilloscope settings, which we don't know. The DS1054Z has all sort of settings to clean up input signals (eg. "hi-res" mode).I'd be more worried by the strange square bit in the signal after each peak. Is this real mains or a generator/inverter?PS: Don't do it again. You can easily damage your 'scope.Quote from: Anthocyanina on March 28, 2021, 10:53:52 amNo. Any "blockiness" is due to the input signal and/or the 'scope settings.

author: Anthocyanina
author_rank: Frequent Contributor
timestamp: March 28, 2021, 11:20:05 pm
content: Quote from: Fungus on March 28, 2021, 11:26:29 amThank you! yes, it was actual mains, maybe the deformation is from the things plugged in nearby? i have 5 things plugged in, 3 computer monitors, a pc, and speakers, i thought since only the pc has power factor correction maybe the deformation is because of the other things which don't have it? i measured the mains voltage and the probe compensation signal using the same settings except for the seconds and volts/division, high res mode was enabled, yes. Thanks!
UT61+ / UT61E / B41T+ (can't put the puzzle :( ) - Page 1
Forum section: electronics / testgear

author: Number-nine
author_rank: Newbie
timestamp: March 28, 2021, 08:12:03 pm
content: Hi everyone.I'v read a lot of related topics, viewed reviews but realy can't make the final desition.I need DMM "to go" for home use, amateur electronics, automotive electronics and electrics.Features needed:- accuracy\speed not lower then ut61e has- quick analogue bar graph- 22k counts or more (depends on accuracy)- quick and correct continuity test- temp is not necessary, but nice if has- datalogging (offline is better, offline+BT is best)- reasonable functionality set-20A possibilityOwon is closest, but i don't shure about it. It is not so popular, like 61e, so this confuses.61e+ has problems with a continuity: It don't stops a long beep on a break if was short more, than 1 second (if I understood correctly). Can this be fixed? Firmare update? Third part firmware?61e is old and has no many features 61e+/owon do.I guess all will finish with bm867s/869s, but may be there is a reasonable way below 100$... I like 867/869, but just don't need their functionality.Thanks.
Philips PM93 - Page 1
Forum section: electronics / testgear

author: minnwell
author_rank: Newbie
timestamp: June 22, 2016, 04:25:27 am
content: hello,i am a beginner in this forum, i think that i have selected the right place to ask my question,so, i have a old philips PM93 that is working like a charm, but the fluke 93/philips PM93 are missing the print function, but have the RS-232 Optical IR port.i have already build the IR transceiver for pc (here is the linkhttp://omapalvelin.homedns.org/fluke/) to connect to my philips PM93, and Scopegrab 32 detect my scopemeter but it can show anything and return "cannot change to 9600 baud".after a lot of research, I concluded that the PM93 and PM97 have the same internal components (EPROM, microprocessor...) !so i think that the difference is just in the firmware or the software.my question, if i put the PM97 firmware in PM93, is it possible to have print function ?thanks in advance

author: minnwell
author_rank: Newbie
timestamp: June 22, 2016, 04:43:26 am
content: just to show pictures of internal PM93

author: Hairystuff
author_rank: Contributor
timestamp: September 16, 2020, 06:14:06 am
content: Hi, would it be possible for you to dump the eprom content as the one in my PM93 has been corrupted

author: harrimansat
author_rank: Regular Contributor
timestamp: March 28, 2021, 09:18:34 pm
content: https://www.eevblog.com/forum/testgear/fluke-flash-utilities-for-early-scopemeters/

author: TurboTom
author_rank: Super Contributor
timestamp: March 28, 2021, 09:41:22 pm
content: I'ld urgently recommend to replace these electrolytics. Once I owned a scopemeter of this heritage and its demise started with these caps leaking, finally resulting in (at least that's what I assume after considerable time spent testing) a failed bonding wire in the LSI Logic chip -- which sealed its fate.BTW: Mine was a PM97 and it had both EPROM footprints populated. During failure analysis I had both the chips out and read them. For the rare event anyone might find the contents useful, here's the archive!
Tektornix 2465B brought to life! - Page 1
Forum section: electronics / testgear

author: Teknow
author_rank: Regular Contributor
timestamp: March 28, 2021, 07:12:01 pm
content: No sooner I bought a Tektronix 2465B than I started reading and immediately imitating without knowledge!I set out buying and replacing the caps, mounting a heat sink on the notorious U800 without knowing if there's deficiency at all, and how much pressure the Chip can withhold before cracking inside while mounting!!!!.I had little experience at that time and later on as I acquired knowledge and fun in measurement, I discovered the appliance needed calibration and I got the notorious problem of the X10, mainly the magnifier not working where the trace started disappearing immediately after pressing it or as soon as the U800 got hot. Things went worse as the U800 wouldn't work at all.I sought for a solution but all in vain. There was a bulky engineered replacement:https://www.davmar.org/TE/Tek2465/lafay.htmlBut that was too expensive and inconvenient for me lots of hard to order chips.I read about the baking adventure and feeling frustrated that was the only choice I had. So I embarked on the task of baking the chip.At the beginning I mounted the chip in zipped position using some metal piece or aluminum and a goldsmith hand vise (see image please) and heated both the spanner and the chip with a heat gun and cooled both immediately in water. It worked OK but the magnification got back to blurring and consequently the trace faded away.There were a few attempts like this but with similar results. Fortunately, I had success! How?I brought wood clips for their metal bar and heated the bar on a gas stove for almost 450 -500 degrees Celsius before glowing red.I didn't have in mind video recording as I had little hope. As soon as the bar got the heat I "felt, hoped, thought!!" is OK, I placed the U800 belly to hot bar and I spanned it to the bar with another spanner firmly (how many Newtons??) and cooled it almost immediately.It worked great the X10 works fine, even the readout intensity and position got better. The appliance needs only calibration.
TEK MDO3024 - Page 1
Forum section: electronics / testgear

author: Jakethepython
author_rank: Newbie
timestamp: March 28, 2021, 04:36:08 pm
content: I have a TEK MDO3024 4 channel 200 MHz. Channel 4 seems to read incorrectly. The first 3 channels read the 2.5 V and channel 4 reads 2V and has ringing at the beginning and end of the signal. I am using the TPP0250 probes. If i switch the probes around or use a standard probe it shows the same issue. I am wondering if this sounds like an input hardware issue or if there is a calibration issue within the scope. Attached is a picture of CH1 and CH4 with the same input signal.
Thinking of getting a used Tek TDS 3012 - Page 1
Forum section: electronics / testgear

author: erikaeick
author_rank: Newbie
timestamp: March 29, 2021, 01:50:34 pm
content: I have a Rigol DS1052 and I'm thinking of getting a used Tek TDS3012 scope. I like antique TMDE, I have a Simpson 260, and Triplett 630 meters. I tinker with old radios and other old electronics. Anyone have any experience with the TDS 3000 series???-Erika

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: March 29, 2021, 04:31:52 pm
content: Hi Erika,welcome to the Forum (I am pretty new here myself...)I'd recommend to get a TDS30xxB or TDS30xxC series instead. Nobody would want to use Floppy Disks in the 21st century. The communications module were optional for the initial TDS30xx series.The TDS30xxB series added the Ethernet port as a standard feature, and the TDS30xxC added USB host (read: you can connect it to a USB memory stick) and Ethernet as standard features.https://w140.com/tekwiki/wiki/TDS3012.While a waveform memory of 10k points may sound silly these days, they were definitely a lot better than the 2.5k points the TDS10x/20xx provided.Cheers,THDplusN_bad

author: erikaeick
author_rank: Newbie
timestamp: March 29, 2021, 07:46:33 pm
content: Thank you for the info! I've no idea how old the TDS3000 is. My Rigol 1052 is a pretty old unit I guess. A friend recommended I look into a Tek DPO2000 series but the prices seem high for used ones.-Erika

author: wizard69
author_rank: Super Contributor
timestamp: March 30, 2021, 12:20:44 am
content: Just go for it! If you like working on the old stuff think of this as an intermediate step to getting a room heating tube based scope.Just realize that almost all used equipment needs a little TLC.
NRP-Z11 in Matlab not working - Page 1
Forum section: electronics / testgear

author: benkm
author_rank: Newbie
timestamp: March 27, 2021, 03:33:58 pm
content: Hello,I'm trying to get the Rohde&Schwarz power meter NRP-Z11 working in Matlab R2021a. I have the Instrument Control Toolbox.The R&S Power Viewer software is working with the power meter.I've studied all the application notes. Installed the NI visa, nrptoolkit, rsnrpz.mdd. But I can't get it working.Hopefully someone can help me in the right direction.Thanks in advanceBen

author: alm
author_rank: Super Contributor
timestamp: March 28, 2021, 09:40:45 am
content: Have you asked R&S technical support about it?The MATLAB driver has not been updated in a while, so it could be that it's not compatible with the latest versions of Matlab or their own drivers. It could be worth uninstalling the nrptoolkit and installing the VXIplug&play driver version 3.6.0.0 from their website.
R&S RTB2004 buggy - position/offset permanently hosed - Page 1
Forum section: electronics / testgear

author: javadesigner
author_rank: Contributor
timestamp: March 27, 2021, 02:06:53 am
content: So, I'm playing with my R&S RTB2004 (has the latest firmware), right ?Edit: I set the probe attenuation to custom 0.1: 1 (not10:1or1:1but -->0.1: 1)When I drag the screen up and down an bit, randomly, somehow I start seeingVertical -> Offset/Positionshowing "clipping".But I should be able to reset this by either hitting the vertical center knob or by simply entering 0 for the offset/position numbers, right ?Well, no! At this point:1) The visual channel markers can't be dragged (top left on the screenshots)2) Clicking the center knob does nothing3)No number can be entered for either offset or position - at ALL. Upon enteringanynumber (including 0), I get a "high limit reached" error message.This is bad enough. Buggy. So I do a soft shutdown and restart (power button in front).Scope reboots to exact same situation as above.I tried again with all probes unplugged (all channels unplugged) - same situation as above.I'll do a hard reboot then. I do a soft shutdown and then turn off the power switch on the back.Scope again reboots to exact same situation as above.You will note that there is literally no data going into the scope (all probes disconnected) but Offset/Position continue as "clipping" - even after a hard reboot. And no way to change this at all.Please see attached screenshots.PS: I finally managed to fix this by hitting "preset" on that channel.Edit 2: was able to get to this state again - by twiddling vertical scale/position knobs. Track grid is turned on under display. Although the channel is set to 0.1:1 attenuation,no probes are connected to the oscilloscope at all. (note: 0.1: 1 isn't theoretical, it is necessary when for example, using a current probe that sends 10 mV for every 1 mA it reads).
Harmonic Distortion Meter? - Page 1
Forum section: electronics / testgear

author: Axtman
author_rank: Regular Contributor
timestamp: March 27, 2021, 09:43:43 pm
content: I am in the process of calibrating an old BK Precision function generator. The calibration procedures call for me to use a harmonic distortion meter. Does anyone have any suggestions or is there possibly and online app? Thanks.

author: Fungus
author_rank: Super Contributor
timestamp: March 27, 2021, 09:44:54 pm
content: Quote from: Axtman on March 27, 2021, 09:43:43 pmA spectrum analyzer will do the same thing. Any distortion in a sine wave will show up as harmonics in the spectrum and you can twiddle to minimize them.What won't do is produce a nice neat THD number for you.

author: bob91343
author_rank: Super Contributor
timestamp: March 27, 2021, 10:48:44 pm
content: It depends on how much distortion you need to measure. If it's not too low, an oscilloscope may do the job. If you are working down well under 1% than you need a dedicated meter such as HP 331 that I have.There aren't too many spectrum analyzers that measure in the audio range, at least for a reasonable price.

author: TimFox
author_rank: Super Contributor
timestamp: March 27, 2021, 11:14:49 pm
content: The old rule of thumb was that 5% THD was visible on a CRO.If you are looking for a used -hpTHD meter, I recommend the 333A, 334A, or 339A, which all have auto-null capability (after gross tuning). The 331A and 332A require manual nulling, but otherwise work well. The 332A and 334A also have an AM detector, which is only needed for broadcasters. My 339A is better than the spec of 0.002% THD (instrument-induced distortion). An advantage of the 339 is that it will normalize to the input level should it change during your adjustments.

author: JDubU
author_rank: Frequent Contributor
timestamp: March 27, 2021, 11:39:02 pm
content: If it's for the audio range, you might be able to use a computer sound card with a spectrum analyzer app.For example:https://trueaudio.com/rta_abt1.htmFor others, do a Google search for: sound card audio spectrum distortion analyzerEdit:Here's a free one:https://www.roomeqwizard.com/features.html

author: Axtman
author_rank: Regular Contributor
timestamp: March 27, 2021, 11:40:22 pm
content: The calibration procedures say 0.7% distortion on sine wave. See attached file.I'm considering "faking" it by putting a sine wave (from a reliable source) in one channel and the BK Precision sine wave in the other. Then I would overlap the two waves and try to match them up.

author: DaJMasta
author_rank: Super Contributor
timestamp: March 28, 2021, 01:39:12 am
content: If you've got a DSO with an enhanced resolution mode, you can probably at least spot check that with its FFT feature. Otherwise a spectrum analyzer has the high bandwidth, and audio analyzers (sound cards would be fine) or power meters in the lower frequency range should both work well.
About Timeter RT-200 gas flow analyzer - Page 1
Forum section: electronics / testgear

author: daisizhou
author_rank: Super Contributor
timestamp: March 20, 2021, 03:04:08 am
content: I got a RT-200 gas flow analyzer,test function is normal.I want to know if any individual or organization is using it now?If you are still using, please contact me, send an email daisizhou#sina.com (#=@)I disassembled it,and backup 6 EEPROM programs,if there is a failure in the future, please use it for future maintenanceI see that the microcontroller on the motherboard has been polished,if you know the model number please let me knowBy observing the motherboard, I found that it has RS-232 function,I guess it may be used for calibration,you can contact me if you are interestedI hope to increase the functionality of this machine through my own effortsIf you are interested or related questions, you can contact me, thank you

author: daisizhou
author_rank: Super Contributor
timestamp: March 20, 2021, 06:26:21 am
content: Pressure module and flow module

author: daisizhou
author_rank: Super Contributor
timestamp: March 27, 2021, 04:08:59 am
content: I disassembled it,And tested the dataI will share it herehttps://www.ebme.co.uk/forums/ubbthreads.php/topics/76167/about-timeter-rt-200#Post76167If you are currently using it and calibrate the ventilator with it, please contact me
R&S RTB2004 - FFT bug with scale markers - Page 1
Forum section: electronics / testgear

author: javadesigner
author_rank: Contributor
timestamp: March 26, 2021, 06:20:43 pm
content: On an R&S RTB 2004 (with latest 02.300 firmware), I'm seeing various wonky FFT related behaviors.For example, changing the horizontal scale in FFT mode makes the graticule markers display wrong! Instead of "mV" and "mS", now they just show "m".Please see attached screenshot. This can't be expected behavior so many years later after its release can it ?

author: Rydda
author_rank: Contributor
timestamp: March 26, 2021, 08:32:32 pm
content: Hi.I still use 02.202, and I don't have that problem.

author: javadesigner
author_rank: Contributor
timestamp: March 27, 2021, 01:11:31 am
content: Thanks - FYI it doesn't happen all the time, seems to be quite random when it starts doing this.
How to accurately inject offset voltage in active probes? - Page 1
Forum section: electronics / testgear

author: dmderev
author_rank: Contributor
timestamp: March 26, 2021, 07:54:01 pm
content: Could anyone share experience/suggestions how to inject offset voltage in something like 1:5 or 1:10 active probes?Specifically, if I have a calibrated programmable voltage (-1V...+1V), and I have a probe with 1:10 front end divider, how do I make this offset apply to the front stage (eg. FET) amplifier in a way, that does not depend on device under test impedance, or whether the probe head is connected or not?One option is to apply the voltage to the bottom end of the divider's low side resistor. But in this case the voltage applied to the amplifier will change with the probe's tip connection.Some active probes chose the dual-amp architecture, where the DC goes through a low pass DC amplifier, and AC goes through a FET buffer path. In this case, the offset is applied to the DC channel's summing node. But dual-amp architecture requires perfect match of the frequency responses to avoid "bump" at the crossover point.Any ideas how to do accurate offset injection in a single amp, wideband probe?

author: David Hess
author_rank: Super Contributor
timestamp: March 27, 2021, 01:06:21 am
content: Quote from: dmderev on March 26, 2021, 07:54:01 pmThere are three ways I have seen used.The oldest is simply to apply the ground referenced voltage to one side of a differential input amplifier. The old Tektronix 7A13 and earlier differential comparators do it this way.Another way is to apply the reference voltage to the reference input of an instrumentation or difference amplifier.A more recent way is to convert a differential input voltage to a current, and then provide current feedback from the output. Then the offset "voltage" can be applied as a current to the summing point, usually through a reference input like with an instrumentation amplifier. This is more suitable for a high frequency design. Analog Devices and Linear Technology have complete ICs which perform this function.QuotePassive offset probes do exactly that. Some active probes also do this with the offset voltage applied through the input divider.
External Printer for HP 35670A - Page 1
Forum section: electronics / testgear

author: gyoung
author_rank: Newbie
timestamp: March 27, 2021, 01:03:43 am
content: Hello,I have an HP 35670A and unable to get it to communicate with an external printer. My understanding is that the printer needs to support PCL 5 (https://www.keysight.com/us/en/assets/7018-06736/technical-overviews/5966-3063.pdf). I'm using an HP LaserJet 1100 and a parallel to mini 36-pin Centronic cable but it doesn't recognize it. Any suggestions?Thanks!
OpenHantek for 6022BE on Windows XP - Page 1
Forum section: electronics / testgear

author: Arcsandsparks
author_rank: Newbie
timestamp: March 26, 2021, 03:21:20 pm
content: I have installed OpenHantek for the 6022BE on my desktop with Windows 10 successfully and am impressed with how well it works. I would like to install it on a laptop with WindowsXP but cannot find any information how to do it. Can anybody give me advice on this? I have searched for this topic but could not find any help. If this is the wrong place to ask this where would be the appropriate place? Thanks in advance.

author: horo
author_rank: Regular Contributor
timestamp: March 26, 2021, 07:09:11 pm
content: Quote from: Arcsandsparks on March 26, 2021, 03:21:20 pmEven when I wrote onmy repo"No support for non-Linux related issues unless a volunteer steps in!", you could ask in theQ&A sectionof the discussion area. But you should prepare some info upfront: Type of your laptop, type of OS (XP 32bit?). What did you do? What did not work? If the issue is caused by the 32bit version, did you try an older release? Does e.g.https://github.com/OpenHantek/OpenHantek6022/releases/download/3.1.5/OpenHantek-Win-x86-Release-b488.zipwork at least in demo mode? etc. ...HTH, Martin

author: Arcsandsparks
author_rank: Newbie
timestamp: March 26, 2021, 09:35:21 pm
content: Thanks for your response Martin. I am using a Lenovo T61 laptop with 2.0 GHz CPU, 2.0 GB RAM, Windows XP Pro, Version 2002 SP3.When I attempt an installation of the version you referenced I receive the message "not a valid Win32 application". I also tried OpenHantek-Win-x86-Release-b341.zip, (the oldest version on the release list), with the same message. I will ask in the Q&A discussion area you suggested.Quote from: horo on March 26, 2021, 07:09:11 pm
HP 853A Mainframe and non-spectrum analyzer plugins. - Page 1
Forum section: electronics / testgear

author: Raindog
author_rank: Contributor
timestamp: March 24, 2021, 05:33:15 pm
content: Greetings all,I just wanted to know if anyone has ever tried to use the HP 180 series scope plugins with the HP 853A mainframe. I know that the the HP 8559A, 8558B and the 8557A can all be used with these older scope mainframes, but is the reverse true? I'm guessing no.

author: factory
author_rank: Super Contributor
timestamp: March 26, 2021, 08:38:40 pm
content: Apparently the 853A lacks some of the power supply rails required for the 180 series scope plug-ins.David