hybridfree/eevblog-posts huggingface dataset:
Rigol DP832A or Instek GPP-4323? - Page 1
Forum section: electronics / testgear

author: rbooth84
author_rank: Newbie
timestamp: February 10, 2020, 01:21:00 am
content: I'm torn between getting the Rigol DP832A or Instek GPP-4323 with the LAN Option. I can find all kinds of information on the Rigol DP832A but the Instek GPP-4323 seems to be lacking a lot of reviews.Is the GPP-4323 worth getting over a DP832A?

author: maginnovision
author_rank: Super Contributor
timestamp: February 10, 2020, 03:03:03 am
content: Looking at the GPP series I'd PERSONALLY go for the 3323 over the 4323. The third channel is only a selectable voltage but it offers up to 5V/5A and has a USB output for the channel. As someone who routinely uses a USB adapter on my supplies I think that's great. Also you just buy the DP832 and unlock all the options. If you want the silly UI you can add that too.

author: nctnico
author_rank: Super Contributor
timestamp: February 10, 2020, 10:25:11 am
content: Spec & feature wise (it is also a DC load) I'd go for the Instek but I have no hands-on experience with it. I disagree with maginnovision on the GPP4323; I think this is the best choice. The 3323 has a fixed output channel which isn't current limited. The GPP4323 has 4 channels with variable voltage and adjustable current limiting. All the models have a USB port which you can use as a fixed 5V power supply if you want to.

author: rbooth84
author_rank: Newbie
timestamp: February 10, 2020, 01:59:41 pm
content: From everything I’m reading the GPP-4323 is better feature wise against the DP832. I will get that ordered this week.

author: Gandalf_Sr
author_rank: Super Contributor
timestamp: February 10, 2020, 02:07:41 pm
content: You could buy a DP832 and then use a 'magic' USB stick to convert it to a DP832A.

author: nctnico
author_rank: Super Contributor
timestamp: February 10, 2020, 02:56:24 pm
content: Quote from: Gandalf_Sr on February 10, 2020, 02:07:41 pmStill the GW Instek GPP-4323 offers a whole lot more bang-per-buck compared to the DP832. The price difference isn't that big anyway.

author: maginnovision
author_rank: Super Contributor
timestamp: February 10, 2020, 04:17:01 pm
content: Quote from: nctnico on February 10, 2020, 10:25:11 amI didn't look closely enough to see that it is only limited at 5A for 3rd channel. That can be a downside for some but for my specific use case I'd end up having to put 3/4 in series at 5V to get the current I need, and even then it could occasionally hit the current limit which is no good. That's just for me though, as this wouldn't be a primary lab supply for me.Quote from: rbooth84 on February 10, 2020, 01:59:41 pmAfter you use it some let us know what you think.

author: rbooth84
author_rank: Newbie
timestamp: February 10, 2020, 04:42:42 pm
content: Quote from: maginnovision on February 10, 2020, 04:17:01 pmWhat would you use as a primary lab supply?

author: maginnovision
author_rank: Super Contributor
timestamp: February 10, 2020, 05:40:21 pm
content: Where I diagnose and develop I use the Rigol DP832 with the Siglent SPD3303X as a standby and vref supply. Where I repair and build I use two R&S single channel supplies.
Solartron 1285A DC Potentiostat Galvanostat, what animal is this ? - Page 1
Forum section: electronics / testgear

author: DC1MC
author_rank: Super Contributor
timestamp: February 09, 2020, 09:11:12 am
content: Hello everybody, I've seen $subject in thisbay link:eBay auction: #https://www.ebay.de/itm/324067594048?ul_noapp=trueAfter reading a bit of datasheet:https://www.ameteksi.com/-/media/ameteksi/download_links/documentations/1285/model-1285.pdfI'm still wondering if it could be used for something, or at least a source of good stable components ?Cheers,DC1MC

author: Kleinstein
author_rank: Super Contributor
timestamp: February 09, 2020, 09:44:58 am
content: I don't think this part would be very useful for other than the intended use. At best one might get a kind of low power lab supply (20 V up to 1 A at lower voltage ?). Maybe a little like a low end, limited range 5.5 digit source meter with an extra sense input (a kind of 3 wire mode).The SW may be limited in control.I won't expect really high end components. At least one would not need them for the specs. Likely CMOS OPs and SD-ADC chip (e.g. LTC2400).
REED Instruments R5010  Digital Multimeter  - Page 1
Forum section: electronics / testgear

author: Roger Need
author_rank: Regular Contributor
timestamp: February 09, 2020, 10:47:00 pm
content: I was looking for a lower cost DMM and came across the Reed Instruments R5010 which is a 40,000 count unit for a little over $100 USD.Brief specs are:• True RMS AC/DC voltage and current, also measures frequency, resistance, capacitance and temperature• 4-20 mA process loop measurements with % readout• Backlit LCD readout with analog bar graph• Cat. IV 600V, Cat. III 1000V safety rating, IP67 dust and waterproof• Includes test leads, temperature input adapter, thermocouple wire, weatherpoof plugs, battery and carrying caseDetailed specs are at this URL..https://www.itm.com/pdfs/cache/www.itm.com/r5010/datasheet/r5010-datasheet.pdfIf you think it is a rebadged version of another product that would be interesting to know.Anyone have any experience with this product or comments on the specs? Good deal or not?Roger

author: coromonadalix
author_rank: Super Contributor
timestamp: February 09, 2020, 11:17:46 pm
content: look like an dt-9939 copy with less functions or an Extech EX530rebadged ...seems decent for the price ?
Fluke DTX 1800 Repair help / Schematics - Page 1
Forum section: electronics / testgear

author: BMK
author_rank: Regular Contributor
timestamp: May 31, 2017, 10:25:17 pm
content: One half My Fluke DTX 1800 set (smart remote part) has died. Powers on, but then LEDs just randomly blink, seemingly under the influence of the presence of my hand near the meter. I'm thinking some GPIO pins are undefined/high impedance whilst CPU is not yet booted??So far I have found one supply rail ( coming off an LT1763)reading near short to ground (0R4).Main PCB is identical in both main and remote units, so I can compare any measurement.This is an insanely dense/multilayered PCB and I think it will be tough to locate all components powered off this rail. Any tips to locate the component that is shorting the rail. Short of putting a bench supply on it and watching for smoke?I've already eliminated the LDO itself and some tants that hang off the rail.Maybe someone has a schematic /service manual??

author: Muxr
author_rank: Super Contributor
timestamp: June 01, 2017, 01:31:44 am
content: These are my go to sites for Service Manuals/Schematics when I can't find it with a simple google search:http://artekmanuals.com/manuals/other-manuals/http://bama.edebris.com/manuals/fluke/I checked for DTX 1800 and there isn't one. It looks like a somewhat recent device so I doubt you'll find a schematic for it. I've been looking for a Fluke 8845/8846 service manual and I can't find it either.

author: BMK
author_rank: Regular Contributor
timestamp: June 01, 2017, 09:26:32 am
content: Thanks for the resource.Unit is not that recent, 2001 design (at least according to PCB markings), 2008 manufacture.Some more info..It seems that the rail in question feeds the 1.8V? Core of the main FPGA. There's maybe half a dozen decoupling caps that are connected to it under the FPGA. Pulling the 256 ball FPGA is not something I want to get into so I'd like to rule out everything else on that rail first.

author: obs_cy
author_rank: Newbie
timestamp: February 10, 2020, 07:34:02 am
content: Hello and sorry for resurfacing an old thread but there seems to be no information online about fluke testers.I have a similar problem with dtx-1800 with the main unit screen pcb, the main pcbs seems to be identical but they are not.Did you had any luck with your pursuit?I can provide pictures of the pcbs.
Linux remote control app for Micsig scopes - Page 1
Forum section: electronics / testgear

author: HwAoRrDk
author_rank: Super Contributor
timestamp: February 08, 2020, 03:58:29 pm
content: Something I came across today: a Linux desktop app for remote control of Micsig scopes.https://github.com/GothAck/oscopeSeems to be in relatively early stages of development, but I'm sure some people here will find it interesting.
How to output first LO from HP8594E - Page 1
Forum section: electronics / testgear

author: Miti
author_rank: Super Contributor
timestamp: January 30, 2020, 02:39:08 am
content: Hi,I have an HP8594E without tracking generator or first LO output, and I would like to add an external TG. I wonder what's thebest wayto get the first LO out of the SA. I've attached a screen shot of the 8594E RF section and an edited picture with what I think would be something that, most likely, doesn't require a calibration. Can you think of something better? I bet you can...

author: Miti
author_rank: Super Contributor
timestamp: January 30, 2020, 08:20:34 pm
content: No one can suggest something?

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 06, 2020, 02:07:38 am
content: Perhaps the 8562E or 8563E documents can help since they do have outputs ??But for a quick and dirty TG, sweeping a synthesizer at the same speed as the SA sweep can be done in a pinch. Be sure the SA RBW is wide enough to capture any frequency tracking error between SA and synthesizer with this crude method.

author: Miti
author_rank: Super Contributor
timestamp: February 09, 2020, 12:47:16 am
content: Thanks EE-digger,Yes, the best way is to use the LO distribution amplifier, I have the 8490 series service manual. The problem with that is the price and that I need the driver board that happens to be the same driver board used for the original tracking generator. I was thinking of a more simple solution.I could use the external trigger input to synchronise them but I'm not sure if they stay in sync. Maybe use the 300MHz cal output, divided by 20 for the sweeper clock. I'll give it a thought.
Alford Slotted Line Set 3050 - Any info? - Page 1
Forum section: electronics / testgear

author: Tony_G
author_rank: Super Contributor
timestamp: February 08, 2020, 12:44:38 am
content: Hey All,I just picked up an old Alford Slotted Line Set 3050 and I'm wondering if anyone has any docs or knows anything about it? Did the usual searches and found a bunch of old US Mil/Gov entries (along with some auction listings). I haven't cleaned out the bench to test it yet but I thought I might reach out and see if anyone happens to know about it or might have a manual/datasheet.Thanks,TonyG
Using a Prema 5017 - Page 1
Forum section: electronics / testgear

author: Resonant
author_rank: Contributor
timestamp: October 04, 2019, 07:13:53 pm
content: I have a question about the use of the Prema 5017. I purchased it about 3 years ago and it came from the estate of a deceased voltnut and it was in good cosmetic condition. It has been calibrated by Prema twice recently last time April 19.When turned on and allowed to warm up for a couple hours it seems accurate when checked against a calibrated source. However, if it is left on in 7.5 digit mode on 30V range using a 10V standard for more than a day it starts to drift a lot, around 0.000171V. Using my own 34401a and borrowed Keithley 2002 they shows almost no drift over the same period against the same Standard.I have checked the internal reference LM399 over the same period and that also seems stable. The big difference seems to be the Prema shows a large offset, if you short the leads.My previous experience has been using US made meters like 34401a and Keithley which don’t develop much of an offset and can be connected up and left for long periods.So do I have a faulty meter or is a characteristic that the Prema needs regular zeroing to be accurate?Resonant

author: Kosmic
author_rank: Super Contributor
timestamp: October 04, 2019, 07:58:49 pm
content: Mine is pretty stable over multiple days. You should check the electrolytic capacitors. Had to change all of them on the analog board and some on the digital board. With the old cap my unit was drifting badly.

author: maginnovision
author_rank: Super Contributor
timestamp: October 04, 2019, 08:26:00 pm
content: Yea, I had the same issue. It was very noticeable because the bad cap was getting much warmer than the others.I added a screenshot of the graphed data from my issue(reading a short). As you see it got really bad but now it's stable again.

author: Resonant
author_rank: Contributor
timestamp: October 05, 2019, 04:20:04 pm
content: Thanks for the advice, I have new Caps on order and I'll report back on progress next week. I was slightly surprised to find CapXon and Jamicon Caps in a piece of expensive test equipment whilst none tested faulty the ESR was poor compared with premium brands like Panasonic or Nichicon.Thanks

author: Resonant
author_rank: Contributor
timestamp: February 07, 2020, 12:28:48 pm
content: Well I finally got the new Caps installed, I faced a bit of a delay with a problem on the connections on C15 which relies on the though hole plating. This stopped the unit booting correctly but was fixed by adding a link C15 to L2 and no further problems and it seems much more stable its no been on for 24hrs. For reference I used Panasonic FC range 1050C from RS.Resonant.
Digatron EW 20-70 "Electronic Resistor" Teardown - Page 1
Forum section: electronics / testgear

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: February 06, 2020, 04:05:00 pm
content: Was looking for an affordable high power capable electronic load. Found this beast for pretty cheap20A / 70V / ~1.4kWUnfortunatly zero decumentation. And the PCB is potted. Pitty.Teardown Photos:https://www.flickr.com/photos/154275690@N07/albums/72157712998387862

author: Vgkid
author_rank: Super Contributor
timestamp: February 07, 2020, 08:07:34 am
content: Very interesting E-load. How loud is it?

author: sixtimesseven
author_rank: Frequent Contributor
timestamp: February 07, 2020, 01:16:24 pm
content: Quote from: Vgkid on February 07, 2020, 08:07:34 amNot to bad. It has two PAPST fans in there. Can't really tell the model because of the fine mesh cover.Slightly less noisy than my Noctua AF14 3000, perhaps 40-45db. Audible but I have headphones on anyway
Siglent SVA1032X - Odd Full Span Sweep Time - Page 1
Forum section: electronics / testgear

author: NY2KW
author_rank: Regular Contributor
timestamp: February 07, 2020, 04:48:01 am
content: I noticed an odd thing with my SVA1032X. If I set it to factory Preset and time the full span sweep with BW at 1MHz, it takes about 0.5secAt 300kHz sweep time is ~ 1.5 secAt 100kHz sweep time is ~5 secAt 10kHz sweep time is ~8 secBUT at 30 kHz it takes 30 secs. Shouldn’t the sweep time fall somewhere between the 100kHz and 10kHZ?Nothing else changed except BW. Can anyone verify if they see the same thing or offer explanation?Jerry
Fluke DMM owner communications - Page 1
Forum section: electronics / testgear

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: February 06, 2020, 08:57:02 pm
content: Fluke has been sending me regular email with regard to their products, however, but almost of them are geared towards field electricians. Are any of you getting the same emails? If so, I wonder if their long term strategy after being acquired by Danaher is primarily the electrician market. Which would be a shame as they used to have some decent lab DMMs.

author: tooki
author_rank: Super Contributor
timestamp: February 06, 2020, 11:44:38 pm
content: Huh? Field and industrial electricians, HVAC, etc has always been Fluke’s primary customer group. Lab gear has always been a distant second for Fluke. (Danaher went after that market by acquiring Tektronix and Keithley.)Heck, for many years now, most Fluke bench DMMs have simply been rebadged Tektronix models.

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: February 07, 2020, 03:02:21 am
content: You are right, but the very one-sided email makes me wonder if Fluke will exit the lab market all together and let Keithley and Tek take that over.I have to agree that Fluke makes excellent field meters, mine is fast, accurate and dependable. Along with the lifetime warranty, it is a good buy.

author: tooki
author_rank: Super Contributor
timestamp: February 08, 2020, 05:40:29 pm
content: One-sided? It would be weird if most of their emails were NOT about electricians' tools, since that is, and always has been, their core market. Like... it seems to me you have very odd expectations!If Fluke exited the lab, what products would they be giving up exactly?? They have three bench multimeters (all rebadged Teks), and a few data acquisition products. That's it, as far as lab gear. And all of that is also sold by Fluke Calibration.Bear in mind that Fluke Calibration makes a whole bunch of lab gear, butFluke Calibration is run as a separate company(I'm not sure about the exact corporate structure, but it's listed under "Other Fluke companies" on fluke.com), so their products won't be in the regular Fluke newsletter. Fluke Cal has its own newsletter you can sign up for:https://us.flukecal.com/subscribe

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: February 08, 2020, 05:58:21 pm
content: Thanks of letting me know, as I was not aware of the separate calibration entity and newsletters, I will definitely sign up for that.
HP Agilent Spectrium analyzer 8595E - Page 1
Forum section: electronics / testgear

author: charlyd
author_rank: Frequent Contributor
timestamp: February 01, 2020, 03:56:16 pm
content: Hello i got my SA few days ago and after doing some testing i discovered the with the options 004,103,130,041Freq cal goes ok. cal stored.Ampl. Cal fail NBW gain failed ??what can this be, or what can i do to fix this.and does anybody know if there is a posibility to test band 1 2.75-6.5 GHz my SG only goes to 2.1 GHz

author: EE-digger
author_rank: Frequent Contributor
timestamp: February 06, 2020, 01:59:01 am
content: Have you run the YTF (YIG tuned filter) calibration? I have an 8596E but haven't used or cal'ed it in a while, so am not sure if your frequency cal is the same thing.The YIG tuned filter can have some serious degradation of alignment from heat and age and not generally adjustable by most humans. If you get the YTF to pass, then there's hope for the unit.To experiment (yes, play) with higher frequencies a few years ago, I've used a Hitite (now Analog Devices) frequency multiplier eval board (4x input frequency, but $500 for eval board, chip is around $40 or so), inexpensive tuned YIG oscillator (ebay) and some $7 , 10GHz location sensors (fun to play with, work on Doppler principle).But there are some USB, GHz synthesizers out there now like this one for $249 (https://windfreaktech.com/product/usb-rf-signal-generator/) which goes to 4.4GHz. Not sure about output leveling or accuracy.
Keysight UXR vs Z-series EVM comparison - Page 1
Forum section: electronics / testgear

author: TheUnnamedNewbie
author_rank: Super Contributor
timestamp: February 04, 2020, 01:38:18 pm
content: For high speed IQ data measurements I often use a real-time oscilloscope combined with the VSA software package from keysight. Right now, I use a Z-series scope for that.I was told by keysight that I would see significant improvement in EVM by simply switching from a Z-series scope to the UXR scope with similar bandwidth. Also, the higher ENOB would result in being able to calibrate out more errors because of higher resolution and linearity.Does someone have any/know of any A-B comparisons done to back up this claim? I am somewhat skeptical of the marketing material Keysight provides me and would like some independent feedback. We are also asking for a demo unit for a few days to do the A/B myself but that would require a lot of setup-time from my part and availability of all the other instruments required in such a setup.

author: Wuerstchenhund
author_rank: Super Contributor
timestamp: February 04, 2020, 07:44:33 pm
content: We use Z-Series and now UXR scopes for wide-band signal analysis, and while I don't know of a direct A/B comparison we've seen some decent improvements in EVM with the UXR, probably thanks to the improvements in the front end, and the 10bit ADC.If that's enough to justify replacing a Z with a same BW UXR, I don't know. The UXR is, after all, pretty much just an improved Infiniium Z. And you'd think that a scope like the UXR which starts somewhere around $130k and which can easily exceed $1M would deserve something more modern than what is still the same old 3rd generation i5 processor that we've seen in the Z.But at the end of the day the only way for you to see if the UXR is worth it for you is really to get one in and test it using your application. This is not a price class in which you want to rely solely on spec sheets or 3rd party accounts.
NVRAM replacement in a Tektronix TDS3014 - Page 1
Forum section: electronics / testgear

author: TechCB
author_rank: Newbie
timestamp: February 03, 2020, 04:05:31 pm
content: Hello everyone,The TDS 3014 series are great oscilloscopes. However when the batterie of the DALLAS DS1745-150 starts to fail its frustrating to find a replacement that works.First things first, desolder the Dallas chip was painful since I do not have a Desoldering Tool. So, if you find yourself in the same situation I will recommend to use solder wick. Using a desoldering pump may cause damage to the board (lift traces or pads). Make sure you cut off the part of the solder wick that you already used to avoid loss in the heat transfer.I'll recommend to use a 24 pins socket, to make it easy in the future to replace the NVRAM. If you are having a hard time getting the DALLAS chip you can use the M48T02-150PC1 it works fine, the only thing is that the DALLAS chip has a supply voltage 3.3V while the M48T02-150PC1 needs from 4.7 V - 5.5 V.Voltage supply is on pin 24, so, if you used a socket you could cover the hole on pin 24, bend the leg of the chip and solder a cable you can connect to pin 2, 3 or 4 of J900. Once you turn ON your oscilloscope you will see the screen turns pinkreally frustrating after all that effort... But it has an easy solution, just press SAVE/RECALL → FACTORY RECALL SETUP → OK CONFIRM FACTORY INIT.Don't forget to configure the right date and time.I hope this was helpful

author: james_s
author_rank: Super Contributor
timestamp: February 03, 2020, 05:18:41 pm
content: This has already been discussed at length in another thread. I designed a little adapter to replace it with the PowerCap version which has an easily replaceable battery. I also worked out where the power-on hours is stored and manually set that to the correct value in the replacement part prior to installing it.Surely if you can afford such an expensive oscilloscope you can also get your hands on a proper desoldering tool? It will cost you a lot more than the cost of even something like a Hakko if you write off the scope by mangling the board trying to get the NVRAM out. I would not even consider trying to do it with wick.

author: TechCB
author_rank: Newbie
timestamp: February 03, 2020, 05:31:27 pm
content: I'm glad you found another solution to the same problem.I replaced almost 20 NVRAM on the TDS3014 with solder wick and works fine. Anyhow, this is another way to get the same results, without an adapter.

author: james_s
author_rank: Super Contributor
timestamp: February 03, 2020, 07:37:03 pm
content: The adapter is only necessary if you want to use the PowerCap package so you can easily replace the battery again in 10 years when you may not be able to get the chip anymore.I've also replaced the batteries in the potted Dallas chips but that's kind of a pain and the result looks messy.
Rigol DG1022 Firmware help please! - Page 1
Forum section: electronics / testgear

author: gm0otb
author_rank: Contributor
timestamp: October 26, 2015, 08:05:57 pm
content: I recently updated my firmware on the DG1022 as per instructions in other forum topic, It now reads "00.03.00.08.00.02.10" and my Numerical keypad, left/right buttons and the last two blue soft keys all ask to be unlocked. I also can not access the DG1022 via SPCI or Ultrawave to unlock keys that way.If someone has the original loader and/or firmware file or has the correct SCPI command to try in the USB port it would be greatly appreciated.I have requested firmware from Rigol, but not holding my breath.Thanks.Ray.

author: JimBeam
author_rank: Contributor
timestamp: December 06, 2015, 03:36:55 pm
content: I had the same problemand after reading your message, I had the idea to take a look inside the DG10x2Update.GEL file, perhaps I could find something interesting there, and while doing so, I stumbled upon the string "KLOC" rsp. "KLOCK" - mmhh, I thought, could mean KEY LOCK - and as this string was in the neighborhood of a few other SCPI commands, I just assumed it also being a SCPI command.So I fired up the UltraSigma Software, right-clicked my device and selected the "SCPI panel control". Entering "SYST:KLOC?" gave me a "0000000000000000111111111111111100000". Ahh, this looks promising! There are 16 bits being at 1 - exactly the number of keys that are lockedSo I quickly entered "SYST:KLOC 0" and a "SYST_KLOC?" again, and BINGO - all zeroes now!Power-cycling the DG1022 and while keeping my fingers crossed, I pressed the '7' key (which was one of the keys that didn't work before), and YEAHthat was it!After doing a pro-forma Utility -> System -> Setting -> Default, I now have an operational DG1022. Easy as 123 - if you know what to doOH, btw. my version now reads as 03.03.00.08.00.03.00. Does anybody know, what the first 03 means?AFAIK the first two numbers are the bootloader 03.03 (which everywhere I read, is 00.0x !), the next 2 numbers are the DSP version 00.08 and the rest is the firmware version (0.3.0)

author: mcinque
author_rank: Unknown
timestamp: December 06, 2015, 07:37:33 pm
content: +1 JimBeam!

author: mgc997
author_rank: Newbie
timestamp: February 03, 2020, 06:22:26 pm
content: FYI, I was unable to connect to my DG1022 using Ultra Sigma to send the SCPI commands. After hours of trial and error I was able to access the DG1022 by using Ni Max Version 5.5.0f0. Under "Devices and Interfaces" I selected the DG1000 Series usb connection. I then selected "Open VISA Test Panel" then under "Input/Output" panel "Basic I/O" under "Select or Enter Command" I cleared the data in the window and typed in: "SYST:KLOC 0" and selected "Write" then "SYST_KLOC?" "Read" it confirmed that now all "zeros" keys are now unlocked.Hope this helps those who couldn't clear the locked keys after firmware update
California Instruments Dynamic AC Line Corrector, LC-1201B - Page 1
Forum section: electronics / testgear

author: HalFoster
author_rank: Frequent Contributor
timestamp: January 28, 2020, 11:23:54 am
content: All:Picked this up recently but can find no manuals or detailed information anywhere and am hoping someone here can point me in the right direction. From limited testing it seems to work fine (it did come from the NBS, after all) but that's not guaranteed to last. I can always RE it of course, but I really prefer to have the original manuals if at all possible.Thanks,Hal

author: HalFoster
author_rank: Frequent Contributor
timestamp: January 28, 2020, 11:26:42 am
content: Also: I have not been able to cross reference the RCA output transistors - again, any help will be much appreciated.Thanks,Hal

author: HalFoster
author_rank: Frequent Contributor
timestamp: February 03, 2020, 05:21:27 pm
content: Anyone?
How to use a potentiometer QuantumX MX840 DAQ + HBM Catman Software - Page 1
Forum section: electronics / testgear

author: Random Model Maker
author_rank: Regular Contributor
timestamp: February 05, 2020, 05:39:43 pm
content: [TLDR: Ever used a QuantumX MX840 or the Catman software? If not, you probably can't answer this question either]Hello you all,Let me preface this by stating that the problem at hand is not my area of expertise, nor is it my occupation. I currently work at the faculty of civil engineering as the only electrical engineer, so I am the "eletrics guy".I am facing the challenge to connect a potentiometric sensor to a HBM QuantumX MX840 DAQ/Amp device, and read the sensor value in their Catman DAQ software. Now this supposedly very clever DAQ box is apparently capable of detecting on its own what it is connected to, but it does not do so in case of this sensor to be connected, which is in itself just a 1K pot.Now in the software you can assign a type of sensor to an input, and it lists all kinds of sensors, but not a potentiometer.This is clearly a PEBCAK on my part, because I can't figure out where you find potentiometric sensors to save my life, but it must work, because the documentation of the MX840 clearly lists how to wire a potentiometer.If anyone has used this software before and knows how this is done, I would be very thankful for a tip.
HPAK 34410A webserver (and firmware) - Page 1
Forum section: electronics / testgear

author: H.O
author_rank: Frequent Contributor
timestamp: February 08, 2020, 03:18:22 pm
content: Hi,I've got a Agilent branded 34410A. I have no troubleaccessingthe internal web server but when I click theBrowser Web Controltab it's all blank. I expected to see (and be able to do) what's shown in this video:But all I get is a LXI logo, no GUI what so ever.Thinking that perhaps a firmware update might help I went to Keysights website and heyhave v2.41while my instrument says it's got2.43-2.21-0.09-46-09.So the question is: Do I have 2.43 (an even newer version than what's available) or do I have 2.21 or perhaps even something else? If I do have 2.43 I don't want to wipe that with 2.41.

author: JDubU
author_rank: Frequent Contributor
timestamp: February 08, 2020, 04:06:21 pm
content: What web browser are you using?Take a look at this:https://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=2595745&nid=-11143.0.00&id=2595745and this:https://www.keysight.com/main/editorial.jspx?cc=US&lc=eng&ckey=2573860&nid=-11143.0.00&id=2573860

author: H.O
author_rank: Frequent Contributor
timestamp: February 08, 2020, 04:43:30 pm
content: Thank you!I'm using Windows 10 with Edge. I don't seem to even have Java installed on this machine and even if I did it looks like Edge does not support it. Great stuff :-)Looks like I need to install Java 8 and use IE./Henrik.

author: HighVoltage
author_rank: Super Contributor
timestamp: February 08, 2020, 04:46:58 pm
content: You need to activate / install JavaAnd make sure all access to the particular IP are enabled.The first time I did this on a 34410A, it took forever to get all the Java settings right.Hopefully a newer version of Java is easier to handle.

author: H.O
author_rank: Frequent Contributor
timestamp: February 08, 2020, 05:28:14 pm
content: Installing Java 8, adding the IP-address of the instrument to the exception list in the Security tab of the Java configuration (or whatever), using Internet Explorer and accepting all the safety warning dialogs popping up does indeed bring me to the interface. It could've "just worked" but I suppose it could also have been a lot (like A LOT) worse.About the firmware, I'm stupid.I was apparently looking at the "Previous version" tab on the website. Right next to it is the "Current version" which does say 2.43 so I suppose that's what I already have.
Function Generator LCD Repair - Page 1
Forum section: electronics / testgear

author: ARGLaser
author_rank: Contributor
timestamp: December 24, 2014, 06:44:23 pm
content: I got a second hand function generator (Rigol DG1022) off of ebay, and it arrived with some damage that was not mentioned in the descriptionIt's got this weird distortion on the display, like soand it is still sort of visible when the display is off.Does anyone know what this is, how it occurred, and is there a fix for it? I've never seen anything like it before.Are there replacement LCD's available for the Rigol DG1022 function generators?

author: Nermash
author_rank: Frequent Contributor
timestamp: December 24, 2014, 07:05:24 pm
content: It doesn't look like lcd damage to me, more like some dirt or string. Have you tried cleaning it, maybe take it apart and try to remove it from the back side?

author: miguelvp
author_rank: Super Contributor
timestamp: December 24, 2014, 07:09:19 pm
content: I've seen that on DMMs that have been left out in the cold below freezing but while running.As for a replacement screen I couldn't find the part number, only that it's a 256 x 64 with 4 gray levels. So if it bugs you enough, you'll have to open it up or find a teardown that has the part number. Also if you have the LCD physical dimensions and number of pins going to it, it might help find the part.But if it was me, I will live with it unless it's growing. Maybe you can contact the seller for a partial refund.

author: gazebo
author_rank: Newbie
timestamp: February 01, 2020, 05:57:08 pm
content: HI, I have a DG1022 and I also have the same problem. It's an internal leakage from the LCDSee the post:https://www.eevblog.com/forum/testgear/rigol-dg1022-bad-lcd-engineered-owners-leave-your-hopinion/
Ultra Sigma Broken - DSA815 - Page 1
Forum section: electronics / testgear

author: g0mgx
author_rank: Regular Contributor
timestamp: February 02, 2020, 01:00:00 pm
content: Hi GangI'm hoping there will be a whizzo on Ultra Sigma here able to offer me some help.I have 3 Rigol devices (2 'scopes and 1 DSA815) - I can see and command the DSA815 from Ultra Sigma and the "Rmt" indicator comes on, but the screen printing to the PC fails with this error:The two 'scopes work fine with this operation.It was all working until I re-built the PC and hasn't worked since then..... so something is amiss but I am at a loss to see what.Any input very much appreciated.MarkG0MGX

author: g0mgx
author_rank: Regular Contributor
timestamp: February 02, 2020, 07:54:44 pm
content: Thank you, thank you, thank you!The image type was set to PNGYour software is clearly excellentMarkG0MGX
Can't read using RS232 from RIGOL - Page 1
Forum section: electronics / testgear

author: majdgh
author_rank: Contributor
timestamp: February 01, 2020, 12:18:19 pm
content: Hello everyone,after i tried to connect DS1302CA with USB and nothing worked, i decided to connect it using RS232.I bought an adapter USB/RS232 and it is working when i try to connect to the Device and i can read the configurations using Ultrascope but when i try to read wave form data, i become an error as photos.. i tried all possible options to edit the handshake in the driver of the adapter or changing Baudrate.. but nothing worked.. i saw that i should add a termination character and i added it in Ultrasigma software to be /n or /n/r ...etc but also nothing worked..The device is seen using ultrasigma and is added correctly but when i try to read waveform data i got the error.Please help and Thanks

author: majdgh
author_rank: Contributor
timestamp: February 01, 2020, 01:56:00 pm
content: I have used LabView with the driver from NI, it gave me the same error although i tried to add the Termination Character inside the a proprety node of The VI..

author: majdgh
author_rank: Contributor
timestamp: February 01, 2020, 02:03:53 pm
content: I tested the Measurment Panel in ultrascope and its reading data, only reading data from the waveform is not working.my goal is to see the screen of the scope in real time..
LeCroy LC584 / DDA-12X Service Manual Wanted - Page 1
Forum section: electronics / testgear

author: niconiconi
author_rank: Frequent Contributor
timestamp: January 31, 2020, 07:41:51 am
content: Has anyone ever seen a service manual for the LeCroy LC584 oscilloscope? Service manuals for the LeCroy DDA-12X series are appreciated as well.On the market there are still some LeCroy 1 GHz scopes from the late 90s for a reasonable price, but if there is no technical information available for troubleshooting, I don't think it's worth the risk purchasing them, sooner or later the scope's going to stop working. I searched the web and I was only able to find service manuals for LC554 and LC574, not LC584.

author: Stray Electron
author_rank: Super Contributor
timestamp: February 01, 2020, 01:15:32 am
content: A LOT of people are having failures with the leCroy LC series scopes and I don't think anyone has been able to repair one or has found a manual for them. There are several threads about them already.there is a lecroy mailing list on Groups.io

author: nctnico
author_rank: Super Contributor
timestamp: February 01, 2020, 02:08:26 am
content: Quote from: niconiconi on January 31, 2020, 07:41:51 amThese seem to be from the same series so the difference is likely to be minimal. If you want to fix equipment you have to be creative anyway because a) the schematics you have may be different from your model b) the schematics don't help to find the fault. In 95% of the cases faults are due to bad wiring, bad connectors and electrolytic / tantalum capacitors. And even without schematics you can fix a lot by using the datasheets and applications notes from the chips used.The worst problem you can have is when a custom chip dies; then you'll need to hunt down a spare.
Hantek MPO6204D - Page 1
Forum section: electronics / testgear

author: hedehede81
author_rank: Contributor
timestamp: January 10, 2020, 08:50:11 pm
content: Hello guys,I was checking Hantek website since I would like to buy a new scope and saw MPO6204D, a 200mhz mixed signal 4 channel scope with 16ch LA and various other functions. I couldn't find any info about it on the web, anyone knows if it will be selling soon? It has some nice specs and good memory depth.

author: thm_w
author_rank: Super Contributor
timestamp: January 10, 2020, 10:15:51 pm
content: Spec is decent:- 4CH 200MHz- 1GS/s (single channel), 250MS/s (4 channel)- 64M memory depth,- 60k/400kwfms/s- 7 inch WVGA capacitive touch screen,(800*480) TFT- USB, LAN, HDMI (option?), RS232There are some listed on ebay:https://www.ebay.com/itm/4CH-200MHz-Oscilloscope-16CH-Logic-Analyzer-Waveform-Generator-3in1-Touch-Screen-/274140679095MPO6204D $720https://www.ebay.com/itm/4CH-80MHz-Oscilloscope-16CH-Logic-Analyzer-Waveform-Generator-3in1-Touch-Screen/303401320752MPO6084D $585But if the price is anything close to that of above though, its not great value. Buying the 6204 makes no sense, when the rigol costs 26% more for 2-8x the performance.

author: hedehede81
author_rank: Contributor
timestamp: January 11, 2020, 03:40:19 am
content: Quote from: thm_w on January 10, 2020, 10:15:51 pmThanks for looking into it. yeah, I saw that on Ebay but only a single eBay seller in the entire world looked a bit suspicious.Which Rigol model are you referring to, 4 channel 200mhz MSOs I looked at are at least double ($1500) or more?

author: tux68
author_rank: Newbie
timestamp: February 01, 2020, 01:57:05 am
content: > Buying the 6204 makes no sense, when the rigol costs 26% more for 2-8x the performanceHi there,Would you mind mentioning which Rigol model you are suggesting here?Thanks much,
Impedance analyzer using the Bode Plot in scopes like SDS1104X-E? - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: January 31, 2020, 09:58:16 am
content: I seem to remember coming across posts describing how to do impedance analysis using an 1104X-E or similar with bode plot function. One using a current probe and others using a current sensing resistor. Including getting reasonably immediate numerical scales.Any pointers?

author: rf-loop
author_rank: Super Contributor
timestamp: January 31, 2020, 10:11:34 am
content: Quote from: n3mmr on January 31, 2020, 09:58:16 amSomething useful you can find perhaps in this thread what was generated originally for explain BodePlot II version features and use including some very basic performance tests.https://www.eevblog.com/forum/testgear/siglent-sds1x04x-e-bodeplot-ii-(sfra)-features-and-testing-(coming)/msg2453655/#msg2453655There reply #45 and bit later also something for your question.

author: graybeard
author_rank: Frequent Contributor
timestamp: February 01, 2020, 03:03:54 am
content: I posted a YouTube video last year on measuring impedance with a current probe and SDS1104X-E.Sample measurements, spreadsheets with calculations, and theslidesare available here:http://ChrisGrossman.com/yt/0006/
New Brymen 869s - Is it Broken? - Page 1
Forum section: electronics / testgear

author: Unknown
author_rank: Unknown
timestamp: January 31, 2020, 03:54:06 am
content: I just got a Brymen 869s from TME. The transaction went very well but I am not sure if the meter is acting right. Without leads plugged into the meter, it does not seem to matter what voltage or amperage setting that I put the meter into, it has a reading that is other than 000.00. Here are some examplesSetting ReadingHzV 000.09Hz dBm -39.40V 0.0026mV (D%) reads zero until I bring my hands near the meter. Then it will swing form 3.00 to -0.15mV (Hz dBm) 001.91mA (%4-20mA) -00.002 (the top number is -24.99)uA -000.02Some readings change when I put the leads on. For example, in the Hz dBm setting, it reads -013.36 with the leads on.Is this normal or should I get TME to replace the meter? As I said, it is one day old.Thanks-G

author: mcovington
author_rank: Regular Contributor
timestamp: January 31, 2020, 05:40:55 am
content: I think those are normal responses to ambient electrical noise.

author: Fungus
author_rank: Super Contributor
timestamp: January 31, 2020, 08:33:05 am
content: Quote from: mcovington on January 31, 2020, 05:40:55 amYep, as evidenced by:Quote from: JohnnyG56 on January 31, 2020, 03:54:06 amThis is all caused by electrons in the leads having nowhere to go. As soon as you connect it to a circuit then they'll have a place to go and the effect disappears. It's noticeable in a high-precision meter.nb. If you put the leads in and short them together then it should read zero(although it might take time to get there on the AC ranges)

author: wraper
author_rank: Unknown
timestamp: January 31, 2020, 09:05:56 am
content: Quote from: JohnnyG56 on January 31, 2020, 03:54:06 amNo decent meter will read zero, only some crap with very low input resistance.

author: Unknown
author_rank: Unknown
timestamp: January 31, 2020, 12:33:05 pm
content: Quote from: wraper on January 31, 2020, 09:05:56 amIt is better with the leads shorted. Some of the settings dropped to 0 but not all. Of the settings that did not drop to 0, they were very close to 0.Thanks Y'all! As you may have guessed, this is my 1st precision meter.-G

author: NoisyBoy
author_rank: Frequent Contributor
timestamp: January 31, 2020, 04:53:41 pm
content: Resistance will not be zero, remember there is resistance in the test leads.
Does anybody know how to contact Tektronix/Keithley for parts in the UK? - Page 1
Forum section: electronics / testgear

author: inaxeon
author_rank: Regular Contributor
timestamp: January 16, 2020, 12:02:00 pm
content: I have filled out this form twice:https://info.tek.com/www-request-parts-information.html(With different email addresses) - and 2 weeks later: Nada. Nothing.I've read plenty of stories on here of people getting Keithley/Tek parts. How's it done?!

author: AndyC_772
author_rank: Super Contributor
timestamp: January 16, 2020, 12:38:52 pm
content: I've successfully ordered Tek parts fromSJ Electronics.

author: inaxeon
author_rank: Regular Contributor
timestamp: January 30, 2020, 03:57:59 pm
content: I made another attempt at contacting Tektronix - and was put in touch with SJ ElectronicsSo yes - SJ is the way for Plebs to get parts in the UK!
Loudspeaker measurements on Rohde & Schwarz UPL Audio Analyzer - Page 1
Forum section: electronics / testgear

author: MindBender
author_rank: Regular Contributor
timestamp: January 29, 2020, 12:59:44 pm
content: Hi Guys,I need to do impedance measurements on a couple of loudspeaker drivers. I could go manually, but that is a lot of work. Fortunately, I own a Rohde & Schwarz UPL Audio Analyzer, which is perfect for that job. According to Application Note 1GA16_1L (https://scdn.rohde-schwarz.com/ur/pws/dl_downloads/dl_application/application_notes/1ga16/1ga16_1l.pdf)Now my instrument does have the requiredSeqCtrloption (B10) installed, but I do not have the mentioned 'accompanying floppy disk', nor the BASIC application SPEAKER.SCO that's supposed to be on it. I don't even know if this floppy disk is part of an additional product.Is anybody here able to help me out getting this application?Cheers!

author: KaneTW
author_rank: Frequent Contributor
timestamp: January 29, 2020, 01:08:16 pm
content: R&S GLORIS' website has "1GA16_1L.exe" with the app note. Not sure what that is since it's a DOS application (and I don't have DOSbox installed), but maybe it's what you're looking for.

author: MindBender
author_rank: Regular Contributor
timestamp: January 29, 2020, 03:06:01 pm
content: You're right, it's right here:https://www.rohde-schwarz.com/nl/applications/loudspeaker-measurements-with-audio-analyzers-r-s-upd-or-r-s-upl-application-note_56280-15861.htmlI'll give that a try tonight. Thanks!

author: MindBender
author_rank: Regular Contributor
timestamp: January 29, 2020, 10:37:25 pm
content: It's a bit cumbersome to set up, and to use, but it does the job and does it well. Follow-up project here:https://www.eevblog.com/forum/projects/building-your-own-sonos-speakers-with-ikea-symfonisk/
BM235 400 mA fuse question - Page 1
Forum section: electronics / testgear

author: rcbuck
author_rank: Frequent Contributor
timestamp: January 27, 2020, 09:59:58 pm
content: I blew the 400 mA fuse in my EEVblog meter. I accidentally put it across a 12 volt, 1/2 amp power source. One pin off on the connector.I have found several HRC fuses rated at 500 mA. That would be an acceptable replacement instead for the 400 mA original.The question I have is does the internal resistance of the fuse have any affect on the current measurement? The fuses I have found vary from 0.5 ohms to 3.5 ohms. I'm tempted to replace it with a standard 3AG fast-blow fuse as the highest voltage I ever measure is about 40 volts.Could someone please measure the resistance of the original fuse and post the result here? That would give me an idea of which replacement to buy. The SIBA fuses are unobtainium in the U.S. as far as I can tell. Amazon and Ebay have them but I wouldn't trust either one of those sources.Thanks.

author: Yansi
author_rank: Super Contributor
timestamp: January 27, 2020, 10:13:12 pm
content: SIBA can be probably bought from TME.eu, even in the US of A.

author: Fungus
author_rank: Super Contributor
timestamp: January 28, 2020, 08:36:01 am
content: I'm fairly sure you can buy fuses from the same place you bought the meter from...

author: ComradeXavier
author_rank: Contributor
timestamp: January 28, 2020, 01:21:55 pm
content: Quote from: rcbuck on January 27, 2020, 09:59:58 pmI am not a measurement expert, but I wouldn’t expect the resistance of the fuse to affect the voltage drop across the meter’s current shunt in any significant way.Quote from: rcbuck on January 27, 2020, 09:59:58 pmI can’t measure the original because I also popped mine. I found and bought a comparable replacement from DigiKey. Not cheap, but I wanted to meet the markings on the meter so I won’t surprise myself later.

author: Fungus
author_rank: Super Contributor
timestamp: January 28, 2020, 05:42:47 pm
content: Quote from: ComradeXavier on January 28, 2020, 01:21:55 pmNo, it won't......but 3.5 Ohms might add significantly to the burden voltage of the meter and affect readings that way. I'd go for the lowest Ohms.

author: rcbuck
author_rank: Frequent Contributor
timestamp: January 28, 2020, 08:55:54 pm
content: I bought the meter from Amazon but would not trust Amazon for the fuses.I'll just buy the one from Mouser that has the 2.9 ohm resistance.Edit: Actually the Mouser part has 0.587 ohms resistance.

author: jancumps
author_rank: Unknown
timestamp: January 28, 2020, 08:59:22 pm
content: they are for sale on the EEVblog shop:https://www.eevblog.com/product/multimeter-fuse-pack/

author: J-R
author_rank: Super Contributor
timestamp: January 31, 2020, 05:59:10 am
content: What I've got:BM235 - SIBA 400mA 1000V: 1.33 Ohms121GW - ASTM 400mA 600V: 1.89 OhmsASTM 400mA 1000V fuse pack from Dave's shop:1.801.891.791.741.79Total resistance on my BM235 is near zero in the 10A range, 2.35 Ohms in the mA range and about 100 Ohms in the uA range.