hybridfree/eevblog-posts huggingface dataset:
BM235 Cannot Change Temperature Units - Page 1
Forum section: electronics / testgear

author: bji900
author_rank: Contributor
timestamp: March 01, 2021, 03:08:48 pm
content: Hey All,I was doing some temperature profiling on some parts last week, and had both my 121gw and BM235 setup, I normally operate in degrees C but my BM235 was set to degrees F, for the life of me I cannot get the meter to change units, I have pressed the select button, held the select button, reviewed the manual, etc. the meter just will not change units.The software revision of the meter is d, I don't think the BM235 is updateable like the 121gw is.The select button works to change range and units on all other ranges. The batteries are good, no leaking is observed. I have removed and reinstalled the batteries. I am at a little bit of a loss here. Any thoughts would be appreciated!

author: Kean
author_rank: Unknown
timestamp: March 01, 2021, 04:41:04 pm
content: So when you press select it isn't even cycling between mV and temp readings? It should cycle between AC mV, DC mV, temp C, and temp F?I have 3 BM235's - 2 with FW C, and one with FW 9 - and all cycle between these with no issues.You are correct that FW is not end user updatable.

author: bji900
author_rank: Contributor
timestamp: March 01, 2021, 05:06:33 pm
content: Correct, That is the only location on the meter switch, where the select button does not change units for me.All other ranges the select button changes the modes correctly.

author: wraper
author_rank: Unknown
timestamp: March 01, 2021, 05:12:25 pm
content: Why are you are only concerned about C/F not changing when you have no millivolt range whatsoever?

author: bji900
author_rank: Contributor
timestamp: March 01, 2021, 05:26:47 pm
content: Well the problem at hand has been the degrees C, but I agree not having mv stinks too. Just trying to diagnose.Also I have many other meters, so not super worried about multiple mV measurements at once at this point
Help with an SPC Error on Tektronix DPO3034 - Page 1
Forum section: electronics / testgear

author: analogRF
author_rank: Super Contributor
timestamp: March 04, 2021, 04:49:39 am
content: I had not run SPC on my DPO3034 for a very long time and today i realize that it fails SPCIt fails at almost the end of the SPC. But self tests always pass even in loops of 10 never fail.I ran the SPC in manufacturing mode and no difference but I can now get a slightly more meaningful error message in the error logwhich unfortunately goes beyond the windowthe morons who wrote the FW didn't wrap the text so that it continues on the second line instead of disappearing out of the window....anyways, using :ERR:FIR? command from the scope's web page I can finally extract the error message as this:Code:846: 3 0 0 Calibrate 22:52:11 03/03/2021 CH4 NREJ comparator A 2mV/div -FAILED- 2mV Trig Hyst Rslt too hiany ideas? any suggestions as to where I should be looking at?I believe NREJ means Noise Reject mode in Trigger setupand the rest are pretty much self explanatory except the last two words "too hi"?what is "too high"?I noticed that if I change down to 2mv/div or 1mv/div on all channels, CH4 has more noise (some spikes actually) than the other 3 channelsThose other 3 channels dont show spike noiseany suggestion is appreciated

author: analogRF
author_rank: Super Contributor
timestamp: March 04, 2021, 03:49:11 pm
content: I posted this on the Repair forum. So if you have comment please leave it there. thanks
R&S CMU200 with Arduino GPIB interface? - Page 1
Forum section: electronics / testgear

author: Ringmodulator
author_rank: Regular Contributor
timestamp: September 21, 2019, 01:17:47 pm
content: Hi,has anyone suceeded in controlling the CMU200 with a simple Arduino GPIB interface?likehttp://egirland.blogspot.com/2014/02/arduino-uno-as-usb-to-gpib-adapter.htmlor the AR488 variant here from eevblog?This emulates a Prologix interface.I would like to use it with R&S FreRes.I have almost no experience with GPIB. Maybe it works only with a Visa Interface?Any input is welcome.Chris

author: m.p.h
author_rank: Newbie
timestamp: February 27, 2021, 06:22:03 pm
content: Hi Chris,did you make any progress with your project?Michael

author: colorado.rob
author_rank: Frequent Contributor
timestamp: February 28, 2021, 02:38:21 pm
content: The inexpensive USB-GPIB adapter available on Aliexpress works well.

author: ps
author_rank: Regular Contributor
timestamp: February 28, 2021, 04:27:32 pm
content: These DIY adapters emulate a Prologix GPIB interface. In your PC's device manager these show up as a serial COM port. You can use it with any tool that supports serial resp. Prologix-compatible interfaces. Like the KE5FX GPIB Toolkit.These adapters do not work with anything that expects a VISA interface, i.e. a National Instruments or Agilent GPIB card.

author: colorado.rob
author_rank: Frequent Contributor
timestamp: February 28, 2021, 05:13:21 pm
content: They work great if you are just writing your own Python code to control the instrument. But, yes, if the goal is to use FreRes or other "pure VISA" tools, I don't think it will work.

author: Ringmodulator
author_rank: Regular Contributor
timestamp: February 28, 2021, 05:21:03 pm
content: Hi Michael,I have bought one of these notorious 82357B USB-GPIB Interfaces.I can report, that it works.Chris
PeakTech 2170 help requested - Page 1
Forum section: electronics / testgear

author: DarrylGodfrey
author_rank: Newbie
timestamp: February 27, 2021, 09:40:08 am
content: Dear all,This is my first post to this amazing forum, so please excuse any newbie mistakes. I've done my searches and haven't come up with the answer.I recently bought myself a PeakTech 2170 and have a dumbo question for any other owners of this device ... can you please help me to understand what the serial/parallel test modes are all about? The manual is not exactly clear.From this forum, I know that the 2170 is a re-branded Shanghai Yihua V&A VA520B (thanks to the person who posted that), but haven't had any success finding a manual for this device either, in the hope that it might have a better explanation.Thanks for any advice you can give.

author: Matje
author_rank: Regular Contributor
timestamp: February 27, 2021, 07:16:03 pm
content: Quote from: DarrylGodfrey on February 27, 2021, 09:40:08 amThese are not so much different measurement modes but different ways to interpret the values the devices measures.The manual mentions that a physical (as opposed to simulated, ideal) capacitor (and inductor or resistor) can be thought of as either an ideal cap with a resistor in series or an ideal cap with a resistor in parallel, actually it will really have both parallel (the leakage) and serial (contacts, leads, etc.) resistance, and serial inductance, etc.Now the device can't find all the individual parasitics from the values measured.So it offers you two options: interpret the measured values as a cap with parallel resistance, or as a cap with serial resistance. Which one you choose depends on circumstances, the devices also offers to do it automatically - see the manual.

author: DarrylGodfrey
author_rank: Newbie
timestamp: February 28, 2021, 12:37:14 pm
content: Thanks, Matje - much appreciated.I'm more used to thinking about a capacitor (for example) as being modeled by exactly what you wrote: a capacitor with a series ESR and ESL and a parallel resistor representing leakage. I think you've clarified things for me.All the best,-d
Datron 1071, Opt 10, 41, 50 value/information - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: February 27, 2021, 09:17:46 pm
content: All-I have Datron 1071 that is fully working and in spec, with a bright display. I got it through a local university auction as non-working, but was just the +5.1 v power supply with too much ripple. Replaced the PS filter caps and all works great. I'm trying to decide whether keep it or sell it and i really can't find any historical pricing for this on fleabay or elsewhere - any input on what would be a fair amount to ask for it would be much appreciated. I really don't need it that bad - I have a 34410 as well as a 3456A as daily drivers (kept in spec via a few 5720As at work) but it *is* a nice piece of kit and I don't care to sell it if there is not a good market for them.That being said, I really am not that familiar with Datron equipment - I'm very much tend to HP - so also please let me know if there is a good reason to keep it.Thanks,Hal
Keithley 2001 or 2010? - Page 1
Forum section: electronics / testgear

author: Anders Petersson
author_rank: Regular Contributor
timestamp: February 25, 2021, 11:51:15 am
content: I'm looking to buy a used 7 1/2 digit DMM. I would like to use Keithley scanning cards for 4-wire measurements of PT100's. I also do low-voltage DC work and remote control is important.An overview of options is here:https://www.tek.com/document/product-selector-guide/digital-multimeters-selector-guideThe 2010 model doesn't seem as popular as the 2001, is there any reason for this? DMM7510 is superior to both but is too expensive.My pros and cons judged from datasheets:2010:+ RS232(+ Continuity test, diode test, dry circuit... not important for me)- 1 uA lowest DCI resolution- 7-segment-style display2001:- Needs GPIB to USB adapter+ 10 pA lowest DCI resolution+ nice-looking dot-matrix displayHave I overlooked anything? Drift specs are similar. Nonlinearity? Measurement noise? Fan noise?

author: Kleinstein
author_rank: Super Contributor
timestamp: February 25, 2021, 05:42:24 pm
content: The 2001 has relatively high noise for a 7 digit meter. The newer 2010 is considerably lower noise, at least in the 10/20 V range.The 2001 has a 20 V range - the 2010 10 V as the prime range.The 100 mV range noise specs for the 2010 look good, at least at 1 PLC - for some reason 5 PLC is not that good anymore (still not bad).I am not sure about the 2010, but quite a few of the Keithley have some extra noise, when using some 100 PLC. Theres seems to be a common weak point related to how the AZ mode is implemented. This also effects the DMM7510 and there is a seprate thread about this issue. It may not be so bad when looking at a low level signal, so using some the 100 mV or similar range. This is more a point compararing to a KS meter.The 2001 is relatively old design and may need cap replacement if not allready done. On the positive side the service manual for the older meters is more detailed and schmaitcs is available if needed.

author: Zucca
author_rank: Unknown
timestamp: February 25, 2021, 06:08:04 pm
content: 2001 to play and have fun.For all the rest 2010 or whatever you want.

author: Anders Petersson
author_rank: Regular Contributor
timestamp: February 26, 2021, 03:50:47 pm
content: Quote from: Zucca on February 25, 2021, 06:08:04 pmWhy is that? Do you mean 2001 is not capable of serious work? Or that's it's just more fun? :-)
Any thoughts on the Aim-TTI MX100Q? Also considering R&S HMP4040 - Page 1
Forum section: electronics / testgear

author: daflory
author_rank: Contributor
timestamp: February 26, 2021, 08:19:01 am
content: Hello everyone,I've been making do with cheap PSU cludges for years and want to finally get a good, versatile PSU.Aside from general electronics and radio, I am interested in vacuum tubes, magnetic amplifiers, and motor drives. Multiple outputs and a wide range of voltage and current options will probably be very useful to me.The two PSU's that look most appealing to me right now are the Aim-TTI MX100Q(P) and R&S HMP4040. EEVblog covered the HMP series very well (I was attracted immediately by the beautiful toroid transformer) and there was a fine review thread from MarkL on the MX100TP, which is probably similar to the Q.However I haven't been able to find any good firsthand info on the MX100Q specifically. If anyone has used this model I'd be very grateful for impressions and comparisons.So far it seems to me that:MX100Q Pros: Very good price at Tequipment, very versatile (i.e 5V for digital, 6V high current for heaters, 70V+70V=140V plate), nice looking interface.Cons: Little info, limited documentation, not programmable (P version is ~$500 more), complex ranges and some configurations might not work as I imagine.HMP4040: Identical rails mean no surprises. Quality looks exceptional, better regulation on paper, massive current output, programmable, limited arb output (sadly won't generate line frequency--but still looks very useful)Cons: lower max voltage output, doesn't show both selected and measured output simultaneously, higher price.Thanks in advance for any thoughts and suggestions.

author: Thomas
author_rank: Regular Contributor
timestamp: February 26, 2021, 12:03:49 pm
content: We have several of this series TTi's at work, and I love them.I mostly use a MX180TP triple channel, but they all operate the same.Simple and intuitive to operate, no need for a manual.Flexible output ranges, for example a single channel can do 15V/10A, 30V/6A or 60V/3A. With two channels: 15V/20A, 30V/12A, 60V/6A or 120V/3A. With four channels it gets very flexible. Selected range is always visible on the display.Sequenced output switching across all channels, with separate settings for switching on and off.All channels can operate at full power simultaneously.Easy remote control over TCP/IP (P version), I guess that applies for the R&S too.Yes, I want one at home
Low Current DC Load (battery)Tester?  - Page 1
Forum section: electronics / testgear

author: clanderson
author_rank: Newbie
timestamp: February 26, 2021, 12:29:37 am
content: I need to test around 500 12v batteries for a large UPS power bank. According to the datasheet these batteries should be tested under a 3x load and confirmed voltage exceeds 9V. Being 6Ah batteries this would mean I need an ~18A load.I have a car battery tester, but it only goes down to 100A. Do you guys know of a relatively inexpensive tool which could test at such a low current? Considering how many batteries I have to process, I would greatly appreciate some direction!

author: bdunham7
author_rank: Super Contributor
timestamp: February 26, 2021, 12:36:08 am
content: All you need is 2 1-ohm 100 watt power resistors bolted to a heat sink--a chunk of aluminum will do. Connect them in parallel and put a voltmeter across them. When you connect to the battery, if it shows over 9 volts after whatever time period, it has passed the test. Use big wires.

author: HKJ
author_rank: Super Contributor
timestamp: February 26, 2021, 06:34:23 am
content: Something like KEL103 looks like a good fit for that. If you want data on a computer you can usehttps://www.eevblog.com/forum/testgear/program-that-can-log-from-many-multimetersto log the testing.

author: Hydron
author_rank: Super Contributor
timestamp: February 26, 2021, 11:17:37 am
content: Newark has the KEL103 under their own brand name:https://www.newark.com/multicomp-pro/mp710259-us/dc-electronic-load-300w-120v-30a/dp/52AH6649Unless you absolutely must save another $50 by buying a banggood special (at the cost of having something a lot less trustworthy) it would be my suggestion as well - $255 is a great price for a proper electronic load.
Datron Wavetek 1281 and 1271 Firmware Revision levels? - Page 1
Forum section: electronics / testgear

author: volvo_nut_v70
author_rank: Regular Contributor
timestamp: July 17, 2020, 03:25:11 pm
content: Going by XDEVs excellent 1281 article, the 1281 seems to have Rev 3.12 as the newest firmware, the 1271 Rev 2.10Has anyone have or seen anything newer?

author: Arhigos
author_rank: Regular Contributor
timestamp: February 26, 2021, 05:20:30 am
content: yes. mine is 3.14

author: TheSteve
author_rank: Unknown
timestamp: February 26, 2021, 06:19:48 am
content: Quote from: Arhigos on February 26, 2021, 05:20:30 amCan you please dump the firmware eprom's and share it with us?

author: Arhigos
author_rank: Regular Contributor
timestamp: February 26, 2021, 07:01:04 am
content: Quote from: TheSteve on February 26, 2021, 06:19:48 amYeah, sure. But from Xdevs website it seems like i need some sort of custom eeprom adapter, right? Do you know if there is any easier way to dump eeprom, maybe with arduino, or thru GPIB?

author: TheSteve
author_rank: Unknown
timestamp: February 26, 2021, 07:23:44 am
content: Quote from: Arhigos on February 26, 2021, 07:01:04 amI know it is possible to backup the nvram via GPIB, but I've seen nothing that suggests you can also dump the main firmware. I'm thinking you'd need a proper eprom reader. Older 1281's tend to have four 27C512's, newer units have two 27C010's.Do you have an EPROM reader of any kind with a DIP socket?

author: Arhigos
author_rank: Regular Contributor
timestamp: February 26, 2021, 10:24:44 am
content: Quote from: TheSteve on February 26, 2021, 07:23:44 ami have two 27C010. I'm pretty sure i can find a compatible socket for that chip. Do you know what the easiest way to dump firmware without any special tools or programmers?
HP 8563A vs HP 8563E Spectrum Analyzers - Page 1
Forum section: electronics / testgear

author: jkyriazis
author_rank: Newbie
timestamp: February 26, 2021, 12:01:48 am
content: Can anyone tell me the difference between the HP 8563A and HP 8563E except for production dates?HP 8563A dates: 11/1989 to 12/1997HP 8563E dates: 06/1992 to 04/2001Performance; features; upgrades from A to E models?Also, can the sub-assemblies from one be used in the other (A to E or E to A)?Looking to cannibalize a defective one as spare parts for another?Feedback/advice solicited and appreciated.Thank you.John

author: KE5FX
author_rank: Super Contributor
timestamp: February 26, 2021, 12:35:33 am
content: The 8563E had 1 Hz resolution bandwidth standard, the 8563A 10 Hz. I could be mistaken but I don't believe there was a 1 Hz option for the 856xA portables.The -E series analyzers also have noticeably lower noise.Not sure which subassemblies can be swapped. The HP part #s on the PC boards are the best guide to that.

author: kirill_ka
author_rank: Frequent Contributor
timestamp: February 26, 2021, 09:29:12 am
content: Quote from: jkyriazis on February 26, 2021, 12:01:48 am8563E has a totally different RF frontend arrangement. The 8563E uses an integrated thing called RYTHM as the center of its frontend. I tends to go out of alignment and it is expensive to align/replace. I think 8563A is much more serviceable because of that.The digital assemblies of the two are very similar, but probably most of them can't be used interchangeably. I wouldn't count on that.

author: jkyriazis
author_rank: Newbie
timestamp: February 27, 2021, 10:18:10 pm
content: Thank you kirill_ka and KE5FX.Looking to get a HP 8563E which is "non-functional".Current issue is screen does not show up when power switch turned on- may be (hoping) HV power supply (PS).Saw YouTube video to repair HV PS.I am hoping I can get the 8563E up and running, but worst case make it a parts bin for 8563A I currently have.As you said, can't tell until I look inside and compare part numbers.Thank you for your insight.As for noise floor and frequency resolution, luckily that is not critical for me right now.John N6VEG

author: kirill_ka
author_rank: Frequent Contributor
timestamp: February 28, 2021, 08:09:21 pm
content: Quote from: jkyriazis on February 27, 2021, 10:18:10 pmDo you mean the part numbers for the assemblies?Then they are not the same. I just checked both service manuals...The only matching number I found is 08562-60042. The GPIB connectorBut at the component level you'll find a lot of parts which can be substituted.I wouldn't bet on the easy repair of 8563E if the condition is "unknown". The working mixer/filter assembly alone seems to cost ~$1500 on ebay.
BK Precision 8500 (original, not 8500B) - missing commands for remote control? - Page 1
Forum section: electronics / testgear

author: toli
author_rank: Frequent Contributor
timestamp: February 25, 2021, 01:21:30 pm
content: Hi All,Looking at the original BK 8500 series manual (download here:https://www.bkprecision.com/products/dc-electronic-loads/8500-300-w-programmable-dc-electronic-load.html#docsoft), I see there are a few operations which aren't included in the list of commands for remote controls:1 - Switch voltage/current range2 - Set/read "voltage on set" and "voltage off set" values3 - Read back the Ah value of the measured battery when in battery test modeIt is obviously possible to work around the last 2 by monitoring it via the remote computer and set load on/off accordingly for (2) and calculate Ah and also Wh for (3) which I plan to do. Still, being able to use the internal functions of the instrument is something I'd like to be able to do, it might come in handy.Anyone knows what the commands for these functions are (if they even exist)?I asked BK support, but they were unable to give an answer to this so far.Thanks.

author: toli
author_rank: Frequent Contributor
timestamp: February 25, 2021, 07:30:56 pm
content: Got another response from BK support. Apparently there are no such commands, so these functions will have to be handled via front panel, or by polling the instrument and reacting accordingly in SW (for the on/off voltage for example).
Feelthech FY6600 60Mhz Noisy Carrier - Page 1
Forum section: electronics / testgear

author: Jomac
author_rank: Newbie
timestamp: February 24, 2021, 07:06:59 pm
content: I recently bought a used FY6600 generator for aligning radio receivers. It was 'as new' and reasonably cheap compared to the new price.I had a good play and set CH1 to 50Mhz and CH2 to 700Hz, CH2 was set to modulate CH1 in AM mode. However the problem i encountered was a very noisy carrier. I reset everything and this time just had an unmodulated carrier set to 50Mhz and the noise is still there. It sounds like a mixture of a buzz and a very sick diesel engine, the more you turn the carrier level up the worse it seems to get.Ive read a few stories about these generators having a very poor power supply and the noise does remind me for poor filtering/decoupling. If it means having a serious revamp on the power supply then so be it.Has anyone come across this before?TIATIA

author: radiolistener
author_rank: Super Contributor
timestamp: February 24, 2021, 07:12:49 pm
content: most of all this is firmware bug

author: rf-loop
author_rank: Super Contributor
timestamp: February 25, 2021, 06:27:00 am
content: Quote from: radiolistener on February 24, 2021, 07:12:49 pmJunk crap HW can not repair with FW. Period.

author: radiolistener
author_rank: Super Contributor
timestamp: February 25, 2021, 04:57:28 pm
content: I cannot check HW quality because I don't have experience with FY6600
UNI-T UTG932 Rotary Encoder Replacement - Page 1
Forum section: electronics / testgear

author: thyself
author_rank: Contributor
timestamp: February 23, 2021, 04:32:45 am
content: Hi,I got my UTG932 Function Generator, and I like it very much.Unfortunately, its Rotary Encoder got broken during my flight back home.I decided to try repairing the unit myself, and replaced the Rotary Encoder withEC12E20-24P24C-SW.But unfortunately it is doing nothing on pushdown (click).So now I wonder, maybe this is not the correct part.On the original encoder there are no marks, so I can't find out exactly which it is.Thus, can anyone please point me to the right direction?Which is the correct Rotary Encoder for UTG932?Or, why the push/click would not work on the new Encoder.After I replaced it, I checked it with the multimeter on the board, and it shows the push button is clicking fine.But does nothing on the menu.Thank you

author: Algoma
author_rank: Frequent Contributor
timestamp: February 23, 2021, 05:05:20 am
content: Check for hairline fractures in the traces of the circuit board, if the switch got pushed too hard it could have cracked the circuit board. Dave had a video where he found such an issue in an unresponsive front panel.

author: thyself
author_rank: Contributor
timestamp: February 25, 2021, 12:07:02 am
content: Thank you Algoma!You are absolutely right, there were micro cracks on the board, just not visible, I checked the continuity of the paths, and only then I found it.I fixed it, it is working fine now, like new.I 've learned a lot from this board, so thank you Dave too!

author: Electro Fan
author_rank: Super Contributor
timestamp: February 25, 2021, 02:31:30 pm
content: Glad you got it fixed.Plz let us know more about how you like the UTG932 - UI, accuracy, etc.
STG-1000W autotrafo: anybody knows it? - Page 1
Forum section: electronics / testgear

author: piranha32
author_rank: Unknown
timestamp: February 25, 2021, 06:31:46 am
content: I'm looking for an autotrafo, and I found on Amazon something called STG-1000W. On the pictures it looks decent, but all I can find on the internet are store pages, and sketchy looking websites scraping listings from ebay. Not a single opinion, or review. Does anybody have any experience with it?For reference, I attach picture from one o sellers on Amazon.
DG4000/DG4162 SCPI arbitrary waveform programming - Page 1
Forum section: electronics / testgear

author: Fabian
author_rank: Contributor
timestamp: February 24, 2021, 04:31:40 pm
content: Hi everyone!I am just working on a little script to remote-control my Rigol DG4162 over python with pyscpi. Works actually quite wellHowever, I am struggeling programming an arbitrary waveform. The programming guide is available here:https://beyondmeasure.rigoltech.com/acton/attachment/1579/f-00b8/0/-/-/-/-/file.zipI obviously need the functions in :TRACE:DATA:*, but a lot of things are unclear.Here are a few more concrete questions:What is the differences between :DATA:DAC16, :DATA:DAC and :DATA:DATA?What is the difference between the DDRII and volatile memory? DDR is volatile, so thats a bit strange.How do I select which channel to program? It seems to be the currently selected one, but how do I select it without changing some setting? For example, the selection is changed if I set the frequency, as this commands allows to pass a channel number. Is there a better way?What is this :DATA:LOAD? command good for? You can list the packets (what packets?) in the volatile memory and then load one of them into the volatile memory. Why would I want to load them from the volatile into the volatile memory? They are obviously already in the volatile memoryA short description of the internals would help, but I could not find anything.Any insight is welcomeFabian

author: Fabian
author_rank: Contributor
timestamp: February 24, 2021, 06:07:14 pm
content: Ok, I was able to figure out a few things by try&error, some of them make sense somehow but my brain just didn't got it rightThe :DATA function is to send real-valued, ascii encoded data in the range -1 to 1. DAC and DAC16 on the other hand expect unsigned 16 bit integer values, which correspond directly to the DAC values. :DATA:DAC16 will write directly to the 16384 byte buffer of the channels' DAC, which means you always have to write 16384 samples, otherwise the rest will just stay unchanged. :DATA::DAC on the other hand will interpolate your data to fit (I guess) in the 16384 sample buffer.A few (new) questions remain:According to the programming guide :DATA accepts up to 16k samples (I guess they mean kibi samples) and the total data amount may be up to 512 k(i) samples. I don't see how I can program multiple packets of 16k samples to achieve 512k samples, as there is no mechanism like the <flag> in DATA:DAC16. Also I cannot send 16k(i) samples (not even 16k), the instrument will just not react to the command. Similar things happen with the :DATA:DAC16 command, which only accepts close to 16384 samples. I guess there is a buffer of 32768 bytes, which includes the command itself. So how can I send the 16/512 k(i) samples using :DATA and :DATA:DAC?Proper channel selection and the :DATA:LOAD? command are still unclear.
Agilent DSO1000 series - is it hackable? - Page 1
Forum section: electronics / testgear

author: nikodem
author_rank: Regular Contributor
timestamp: March 01, 2021, 09:23:06 am
content: I've recently acquired an DSO1002A scope. As it is a low-end scope from the DSO1000 series I came to wonder - is it hackable? can one e.g. get higher bandwidth using some resistor shenanigans?Regards!
help IDing OEM of '80s/'90s Mastercraft, Selfix, & Circuit Test multimeters - Page 1
Forum section: electronics / testgear

author: mistereous
author_rank: Newbie
timestamp: February 22, 2021, 07:47:56 pm
content: Curious to figure out who manufactured three multimeters I've had kicking around for years.The pocket-size analog one branded Mastercraft would have been purchased at Canadian Tire, best guess being sometime in the 1980s. It has no model or catalog number on it. Was Colluck supplying Canadian Tire that far back?The old Selfix model 5785 looks similar to other brands I've seen from maybe as far back as the 1960s. It was imported from Japan by the former Perfect Manufacturing & Supplies Corp. of Montreal.The Circuit Test model DMR-2250 3½ digit multimeter is likely from 1996, imported by RP Electronics of Burnaby, BC, Canada. Many Wavetek 'Meterman' made-in-Taiwan designs from that period appear to be built very similar.Thoughts on OEMs, anyone?
DIY Active Differential Probe Set -Based around TI INA826EVM Evaluation Kit  - Page 1
Forum section: electronics / testgear

author: GrievousAngel
author_rank: Contributor
timestamp: February 19, 2021, 01:12:29 am
content: A friend mentioned using a TI INA826EVM Instrument-grade Diff Opamp Evaluation Kit as the center of an excellent active diff probe set! So found one at DigiKey I think, costing a little over $30USD. Banana & BNC connections and project box were additional cost if you don't have some laying around.BTW . . . there a 2nd area on the TI PCB for adding another opamp for buffering to improve CMRR loading of lower impedance signal sources. I haven't added that enhancement yet.It can run off a single voltage rail or a +/- supply. I used a small external switching power supply (+/- 16VDC, dropping the 48VDC) I had from previous DIY studio-grade audio projects (API-like Series 500 DIY modules offered by CAPI).Bottom line is the DIY Active Diff Probe really preforms exceptionally, bettering any diff probe I've used previously. These things ain't cheap ($150USD to $1000+USD). It is an easy build. I use it to check out DIY analog modules for use in studio settings. The DIY Diff Probe is used with my RIGOL DM3058e DMM and a PICO 4262 Purpose-built Analog OScope/Spectrum Analyzer. It cancels out most of the induced noise at the 'front door'! Also allows you to 'grab' most any interqual circuit measurement without concern of signal or power ground. My version is designed for low voltage analog circuits only.If interested, search these items Online. If you have a few questions, I'll try to answer them. It took about 2 hours once all items were on the table.Later,GrievousAngel

author: egonotto
author_rank: Super Contributor
timestamp: February 19, 2021, 09:36:26 pm
content: Hello,why you choose a INA826?best regardsegonotto

author: exe
author_rank: Unknown
timestamp: February 20, 2021, 09:31:30 am
content: Huh, ina826 datasheet made me itching. It seems on the "Output Offset Voltage Drift (mV/°C)", what they really mean is uV/C, not mV/C. Otherwise it's the worst inamp I've ever seen.

author: ogden
author_rank: Super Contributor
timestamp: February 20, 2021, 10:20:18 am
content: Quote from: exe on February 20, 2021, 09:31:30 amCould be so. You are welcome to offer better inamp. Preferably with low cost development board which could be used as diff probe adapter without heavy modifications.

author: egonotto
author_rank: Super Contributor
timestamp: February 21, 2021, 04:06:24 am
content: Hello,perhaps the AD8421 with boards from ebay is a good choice.Best regardsegonotto

author: SilverSolder
author_rank: Super Contributor
timestamp: February 22, 2021, 03:13:34 pm
content: Have you got a picture?
Noise on Philips PM5515 Colour Pattern Generator - Page 1
Forum section: electronics / testgear

author: tabajaralabs
author_rank: Regular Contributor
timestamp: February 21, 2021, 11:58:11 pm
content: Greetz ALLI just got a pair of PM5515. The first one I recapped everything on the motherboard, and the diagonal bar noise kept running on screen. The second one, not yet recapped, shows the same noise. I see lots of noise on 5V line, tried recapping other boards, putting ceramic/elco caps around the board, nothing tames this noise. Am I being just dumb (as usual) or there is something wrong on these Philips colo(u)r bar generators?Thanks!Alexandre, PU2SEXhttps://youtu.be/qpToDrAfVaI(noise is very faint in youtube video, more noticeable on the end)

author: tabajaralabs
author_rank: Regular Contributor
timestamp: February 22, 2021, 03:00:56 am
content: Update:Changed all the capacitors of mainboard, Digital Board, Multiburst, PAL/NTSC, and the noise keeps there, nice and shiny.I have no more options. Took off the mono audio board, changed nothing (this is the only board I haven't recapped). Power supply still looks noisy. One option would be change the regulators, but I don't believe the regulators would be responsible for this.Any tips?Thanks!

author: tabajaralabs
author_rank: Regular Contributor
timestamp: February 22, 2021, 05:17:07 am
content: News from the front:Now the noise keeps stationed on the screen, the bars keep stopped. The problem was in the master clock generator, the two crystals/trimmers besides the digital board. Adjusted the trimmer near the panel to the correct frequency, and voila! The interference - albeit present - is stopped. I'll put some photos tomorrow showing the exact problem and solutionStill needs to clear this interference. keep working...
Oracle Virtual Box PCIe Printer Port Question - Page 1
Forum section: electronics / testgear

author: joeqsmith
author_rank: Super Contributor
timestamp: February 22, 2021, 03:07:44 am
content: BackgroundI have some equipment that uses the printer port. I had found a PCIe card that works with DOS up to Windows and was able to get my old tools working with it. We had a storm which damaged some of my equipment including this port. I found the same board and have run some hardware tests on it and it's now working.ProblemI would like to run the software under Oracle VirtualBox. There is some support for printer ports but I wonder to what extent. After reading the following:https://forums.virtualbox.org/viewtopic.php?f=24&t=54187https://www.reddit.com/r/virtualbox/comments/eo7jzd/how_to_enable_parallel_port/All the software will be doing direct I/O calls. I am able to see the port under a virtual machine but sniffing the port, I am unable to create any activity. Has anyone here been successful in getting the printer ports to work?
Siglent SDS1000X(-E) with sigrok - Page 1
Forum section: electronics / testgear

author: MadS
author_rank: Newbie
timestamp: February 21, 2021, 07:26:27 pm
content: Hi,I saw that the SDS1000X(-E) series is supported by sigrok. (https://sigrok.org/wiki/Siglent_SDS1000X_series)Did anybody try this already? Mind sharing some images/thoughts?So far I only used digital inputs with sigrok/pulseview. So is the analog data representation the same as in the digital domain? Is it turning the SDS1000X into a USB oscilloscope?And: Does sigrok work even with the optional logic analyzer attached to the scope? So you can see both digital and analog values next to each other?Thanks!

author: tautech
author_rank: Super Contributor
timestamp: February 21, 2021, 08:39:26 pm
content: No experience with sigrok but if it accepts all of the SCPI commands in the programming manual it should return the info you seek:https://www.siglenteu.com/download/9103/All Siglent scopes can be controlled via USB and LAN and some like the X-E's have a webserver that has a SCPI command panel where you can enter scripts and get data from the scope.The programming manual linked above has many examples of the correct command syntax for you to study.
Philips PM551x easter eggs - Page 1
Forum section: electronics / testgear

author: Scratch.HTF
author_rank: Regular Contributor
timestamp: November 15, 2018, 01:04:53 am
content: On a Philips PM551x video pattern generator, I discovered three hidden patterns:Two tone Greyscale+Colour Bars+Greyscale(press Purity Red then White)Horizontal RGB+CMY Bars(press Purity Green then White)Checkerboard with White Rectangle and Black Border(press Purity Blue then White)

author: ps
author_rank: Regular Contributor
timestamp: November 15, 2018, 06:49:23 pm
content: With my PM 5518-TX VPS I have to press R/G/B then Color Bar.

author: tabajaralabs
author_rank: Regular Contributor
timestamp: February 21, 2021, 11:47:40 pm
content: PM5518 is using RGB and Color Bar too
SIGLENT SDS 1202X-E Oscilloscope- goes blank after 60 seconds. - Page 1
Forum section: electronics / testgear

author: Voxman
author_rank: Contributor
timestamp: February 21, 2021, 02:26:10 am
content: Forgive me please but I cannot find any reference to the issue I’m having with my brand new SIGLENT oscilloscope.Turn it on and start probing circuit, and 60 seconds later the screen goes blank. It comes right back if I press practically any button. Then 60 seconds later the same thing happens. I know it shouldn’t do this but there isn’t any reference to this hiccup in the manual that I can find.I’m sure it’s a setup issue but I haven’t been monkeying around with the settings at all.Anyone know what and how to correct this annoying problem?ThanksVoxman

author: tautech
author_rank: Super Contributor
timestamp: February 21, 2021, 02:33:26 am
content: Utility menu>P3>Screensaver = OFF

author: Voxman
author_rank: Contributor
timestamp: February 21, 2021, 02:52:48 am
content: Thanks!! I knew it was something dumb I was missing. Puzzling why it started doing that after a few weeks on its own.?Appreciate your quick help.Voxman

author: tautech
author_rank: Super Contributor
timestamp: February 21, 2021, 03:03:49 am
content: Quote from: Voxman on February 21, 2021, 02:52:48 amSomeone changed the setting, there's no other reason and as it's one of the user settings it's not reversed by a press of Default.The only way to get fully back to a factory default is use Secure Erase and factory Default.IIRC these units also have a User Default so you can have your fav settings returned with the Default button.You set this up in the Save/Recall menu.
HP 4338A milliohmmeter with leaking capacitors (preventative maintenance) - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: February 21, 2021, 11:47:45 am
content: A heads-up. If you own a HP 4338A milliohmmeter, some preventative maintenance may be in order.On this one with serial prefix 3427JXXXXX (Japan) all of the Nichicon 22uF 50V capacitors are leaking.Many traces have turned black indicating corrosion.

author: coppercone2
author_rank: Super Contributor
timestamp: February 21, 2021, 08:10:37 pm
content: the 22000uF can go off also. This is actually a good unit to bother with
AC Insulation Tester - Page 1
Forum section: electronics / testgear

author: Propaganda
author_rank: Newbie
timestamp: February 19, 2021, 06:14:02 pm
content: I am looking for a test device that outputs 500VAC/50Hz and performs a impedance measurement on the device under test(>10MOhm). Anything off the shelf that can perform this type of measurement?

author: Monkeh
author_rank: Super Contributor
timestamp: February 19, 2021, 07:13:32 pm
content: Why AC?

author: Gyro
author_rank: Super Contributor
timestamp: February 19, 2021, 07:45:53 pm
content: The AC ones are usually known as Hipot testers rather than insulation testers.Edit: Actually, that's not what you seem to be describing.

author: Ice-Tea
author_rank: Super Contributor
timestamp: February 19, 2021, 08:09:33 pm
content: Most of the devices that are designed for insulation testing are DC only. Any reason why you would want it to do AC? I don't think there are any/many standards that require it?

author: Propaganda
author_rank: Newbie
timestamp: February 19, 2021, 08:12:01 pm
content: I can't really go into specifics of the application, but my standard I'm trying to test to is 500VAC/50Hz.

author: Propaganda
author_rank: Newbie
timestamp: February 19, 2021, 09:18:55 pm
content: I decided that using a hipot tester(GPT-9801) was probably as good as I was going to get and I can obviously relate the current output measurement to impedance...

author: threephase
author_rank: Regular Contributor
timestamp: February 19, 2021, 09:54:59 pm
content: Yes, it would be a high pot or a machinery tester that would give you 'AC Insulation Resistance'. All the standards that I work to though always express it as a leakage current.The only one I have found different is BS7671, which is based around our LV Installations (less than 1000V) where they use impedance for line loop and earth measurements.

author: helius
author_rank: Super Contributor
timestamp: February 19, 2021, 10:15:24 pm
content: HVI supplies AC dielectric test sets. the PFT-103CM outputs up to 10 kV AC and displays leakage current, up to 300 mA.
Connecting to Tek TDS3000B using Google Chrome - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: August 05, 2020, 09:13:22 am
content: For some reason, Connecting to a Tek TDS3000B (or C) does not seem to work with Google Chrome. Firefox works OK, as does IE.If you have a connection to the scope with Chrome, Firefox won't be able to connect at all until you close the Chrome browser.Has anyone been able to do this? Is there a setting in Chrome that fixes this?

author: Jwalling
author_rank: Unknown
timestamp: August 06, 2020, 08:19:55 am
content: Even a verification that it does or doesn't work?

author: wolfy007
author_rank: Frequent Contributor
timestamp: August 06, 2020, 08:29:35 am
content: Ill give it a go when I get home.

author: jgorsk
author_rank: Regular Contributor
timestamp: February 19, 2021, 10:10:23 pm
content: A little late but I can confirm that my TDS3000B works with Firefox and IE and doesn't with Chrome and Edge
Here's my 'WORKBENCH'... It's from Mrs. Anderson's discard furniture (!) - Page 1
Forum section: electronics / testgear

author: RJSV
author_rank: Super Contributor
timestamp: February 19, 2021, 11:12:35 pm
content: Hello. We aren't all the rich - tycoons, here in Silicon Valley. I'm somewhat near NASA-Ames there 30 miles away in Sunnyvale.But I make do. Other Mechanical Engineer fellow that rents a portion of house, has good old-school TEST BENCH; including a Techtronics 465 scope.Plus a 'GwINSTEK' frequency gen and power supplies and all solder tools.I like to joke, "My other bench..etcPhoto showing, on the cheap (free), security tags, with button batteries and more than 60 small loudspeakers!You make do with cheap deals... Way poor in the Bay Area (still living it)
RAM IC tester - Page 1
Forum section: electronics / testgear

author: xzswq21
author_rank: Frequent Contributor
timestamp: February 18, 2021, 03:02:30 pm
content: Hello, is there any way to test RAM chips? I have a DDR SDRAM such as K4H561638N and etc, I want to know the chip is damaged or not. I've found some component tester such as TL866 or something similar but non of them could test RAM chips.Thanks

author: Fungus
author_rank: Super Contributor
timestamp: February 18, 2021, 06:47:06 pm
content: That's got a lot of pins, it's not surprising that ordinary component testers can't test it.Testing RAM isn't easy, you have to test at full clock speed and use special test patterns. For small quantities of $4 chips it simply isn't worth investing in a testing device. Just buy a new chip and try it. If the device starts working correctly, the old chip was faulty.

author: Algoma
author_rank: Frequent Contributor
timestamp: February 18, 2021, 07:10:29 pm
content: Dedicated Ram testers do exist, with various slot types, I recall a recall using a specific one that used to test SIMM memory sticks 20 years ago. Overall its usually a scrap PC that can fit the memory type, along with known good memory in the first slot. Then a memory testing software on a minimal boot disk (USB?).The goal is to use the minimal amount of memory to startup the system, ideally in single channel mode, to avoid hitting the suspected bad memory.Ram memory is most often disposable if its even slightly suspected as bad. Even slight thermal changes can trigger unusual behaviors in bad memory chips.https://www.memorytesters.com/products.htmAdapter:https://www.memorytesters.com/ramcheck/ddr_chip_conv.htm

author: Algoma
author_rank: Frequent Contributor
timestamp: February 18, 2021, 07:30:19 pm
content: Otherwise, Basically compare the Power draw and heat generation of the chip itself, compared to a known good one.. Hook up minimal VCC and ground and see if its internally heating up and drawing a few mA more than expected when idle.

author: Algoma
author_rank: Frequent Contributor
timestamp: February 18, 2021, 07:34:51 pm
content: Option 3: Widlarizehttps://www.eevblog.com/forum/chat/the-widlar-izer!

author: james_s
author_rank: Super Contributor
timestamp: February 18, 2021, 07:36:07 pm
content: DRAM testers are expensive. I have an old model made by a now defunct company called Darkhorse Systems, it's fantastic for vintage PC stuff since it will identify and even test the speed of unknown SIMMs. It's too old to support anything like the RAM you have there though.
Advantest R3132 Spectrum Analyzer ----  RF fail ---- - Page 1
Forum section: electronics / testgear

author: Freddy2021
author_rank: Newbie
timestamp: February 15, 2021, 05:50:50 pm
content: Hello people,I'm new here.I hope I can get help here.I have a problem with my ADVANTEST R3132 Spectrum Analyzer (no options),I bought the device used.The device worked perfectly so far, except for the error when booting BACK UP RAM == NGNot OK. and CPU fail (self-test), everything else was fine so far.Today I replaced the BACK UP battery and now BACK UP RAM is O.K. and during the self-test(Shift 0) CPU O.K. but the device now shows "RF fail" during the self-test.Does anyone know what could be defective?Please helpThank you in advanceFreddy2021

author: Grandchuck
author_rank: Super Contributor
timestamp: February 16, 2021, 01:54:48 pm
content: Does it have a self-calibration function? If so, have you tried it?

author: Freddy2021
author_rank: Newbie
timestamp: February 16, 2021, 05:30:59 pm
content: Yes it does, the problem seems to be thermal.If the device is cold, everything works, Cal O.K, Self-test O.KAs soon as the device is warm, the - RF Fail- error occurs during the self-test.Problem is the RF moduleCircuit diagram ?

author: nctnico
author_rank: Super Contributor
timestamp: February 17, 2021, 09:53:35 pm
content: Did you already search the forum? I think there are other threads about this problem for the R3132

author: Freddy2021
author_rank: Newbie
timestamp: February 18, 2021, 10:34:11 am
content: Yes, thank you .I found it in the forum, there a similar problem is discussedIs it also a temperature problem? Could be?