hybridfree/eevblog-posts huggingface dataset:
Low depth 3 kW VFD - Page 1
Forum section: electronics / general

author: gaminn
author_rank: Frequent Contributor
timestamp: September 14, 2022, 08:20:38 am
content: Hi,do you know any 3 phase 400V AC motor VFD drive capable of this:3 kW powerlow depth of less than 135 mm (5.3 inchprogrammable relay outputdigital and analog control inputsscalar (V/f) control is enoughbreaking capabilitySo far I found only Yaskawa GA50U4009AJA but it is not available in any VFD store.It seems there are drives on AliExpress with low profile (low depth) but I'm unsure about quality.
PSA: Check HP Probe / RF Accessory Cases for Degraded Foam (Oxidizes Connectors) - Page 1
Forum section: electronics / testgear

author: garrettm
author_rank: Frequent Contributor
timestamp: February 02, 2025, 09:06:49 am
content: So, I feel that most people probably already know this, but old (<90s) and somewhat newerish HP/Agilent probe cases and RF accessory kits often have crappy foam that degrades into a viscous black goo that corrodes connectors and probe tips (anything metal really). Primarily it attacks nickle plating (forming a green crust), but it can cause thin gold platings to peal off and will also attack stainless steel (rusty splotches).I have an HP 35676A reflection/transmission kit for the 3577A where the foam had corroded the SPC type N barrel connectors to such an extent that I just threw them away. All of the stainless steel parts had rusty splotches that interfered with the threads when mating and was annoyingly hard to clean off.As of today, I just got the 87512A reflection/transmission kit (made ~ 1992) for a nice deal, but the foam padding had already began degrading and partially corroded a few unprotected connectors. Additionally, the previous owner must have stored the case somewhere with high humidity as there was mold growth on two of the soft red plastic connector covers. The mold looked like it was literally eating the plastic... The soft black plastic connector cover, on the other hand, wasn't affected.Anyways, I was able to successfully clean up the kit, but had it sat there any longer... Well, it wouldn't have been pretty.

author: garrettm
author_rank: Frequent Contributor
timestamp: February 02, 2025, 09:15:07 am
content: Hit the limit for number of photos, so here's the last one.I used an old tooth brush to clean off most of the foam and then used some Windex (ammonia) to remove the green nickel compound (as a soluble nickel ammine complex) and then some Never Dull polish cotton to finish cleaning / lightly polish and a final wipe down with isopropanol. In the end, the oxidation wasn't was bad as I feared and I can barely see the pitting on the exterior of the male connectors. And most importantly, the internal mating surfaces look fine (whew!). I honestly hate cleaning off corrosion, but sometimes it's gotta be done...

author: garrettm
author_rank: Frequent Contributor
timestamp: February 03, 2025, 01:28:26 am
content: Another "evil foam" incident is when I bought a kit of Maury thermal converters, where the foam had "gone to town" on these very expensive AC calibration standards. I got the kit for $50 bucks, which made the effort of cleaning them worth it. But cleaning them was a real pain to do.
Couple of fun things from DesignCon 2025 - Page 1
Forum section: electronics / testgear

author: jayk
author_rank: Regular Contributor
timestamp: February 02, 2025, 09:19:42 pm
content: Went to the DesignCon EXPO on Thursday. Took a couple of pics... one shows a PCIe 6.0 PAM4 waveform (64Gbps) on a 65GHz 320GSps 12bit scope from Lecroy. The other is the PCBite probe system, which is very cool and really seems to work pretty well. They've even got some high bandwidth passive probes coming out with several GHz of BW.Rigol, Siglent and UNI-T all had decent-sized booths, but not a ton of traffic.
Is there anyone who have older N7800A softwware with version 2.x - Page 1
Forum section: electronics / testgear

author: wldshy
author_rank: Contributor
timestamp: February 02, 2025, 04:27:52 pm
content: As the topic.I got a second hand MXA Spectrum Analyzer with several fault, during serval months work, it seems almost functions work fine now, but full alignment need.keysight release calibration software under N7800A TME, newer version of N7800A newer than v3.0 seems very difficulty to hack.so is there anyone who have older copy of N7800A softwware with version 2.x or 1.x.Thx.
Yokogawa TY720 without gas discharge tubes - Page 1
Forum section: electronics / testgear

author: Bobson
author_rank: Regular Contributor
timestamp: February 01, 2025, 04:22:57 pm
content: I've got second hand TY720 which lacks both GDTs. Since I have dozens of other DMMs, I don't plan to use it to measure higher voltages, but would like to know, what max voltage would be safe without GDTs?If up to 300V AC is ok, it would be ideal.tia

author: Kean
author_rank: Unknown
timestamp: February 02, 2025, 09:02:47 am
content: Presumably whatever it is specified to measure - which seems to be 1000V AC & DC. The GDTs should not normally conduct under those measurement conditions.But be aware that it may not survive any unexpected spikes/surges, and it may not still meet its specified CAT rating.Why are the GDT parts missing?

author: Bobson
author_rank: Regular Contributor
timestamp: February 02, 2025, 10:08:48 am
content: I don't know why are they missing, the DMM is well used. All functions work ok, and measurements are still to specs.
Repair Microhmmeter Cropico DO5000 - error the front panel control IC  - Page 1
Forum section: electronics / testgear

author: chinhcheng
author_rank: Contributor
timestamp: April 14, 2023, 07:27:06 am
content: Hi,Is there any body have Microhmmeter Cropico DO5000?I have an unit that failed to activate the front panel (the buttons)I hope If you have this unit, could you please support to send me the program of the front panel control IC (PN: CP82C55AZ)Thank you so much in advance

author: neverendingstudent
author_rank: Regular Contributor
timestamp: February 02, 2025, 06:23:38 am
content: So, I know your post is from over a year ago, honestly I only stumbled across it because I wanted to see if anyone else was working on a DO5000.I have one, it's shelved at the moment as I'm partway through a repair and got distracted by other things, but it is functional. I've never extracted chip firmware before, though I've seen others do it on YouTube, and I've meant to get a Xgecu for a while anyway...Do you still need the firmware from the front panel chip?Also, I think I have an older version compared to the one you have a picture of. Adding a picture of what mine looks like. No idea if the chips will be the same, though I could probably get a picture of the chip and we could compare the numbers on them.
HP 54542A button time response? - Page 1
Forum section: electronics / testgear

author: StrayElectrons
author_rank: Contributor
timestamp: January 31, 2025, 05:33:25 pm
content: For normal use on this HP 54542A, how responsive this scope during button presses? I hear some parts of it is very slow response, what is these items?Another time response, how responsive when doing the real time waveforms, not waiting for it to digitize?Lecroy 9354TM fell through as someone bought it first.Cheers,

author: garrettm
author_rank: Frequent Contributor
timestamp: February 02, 2025, 12:02:44 am
content: I have an HP 54542C (C is for LCD screen instead of CRT). It's quite "responsive" to the user interface controls. So I don't know what you've been reading. Where it becomes slow is acquisition at slow time bases like you would use for looking at 60Hz AC mains and such. If you are looking at "fast" signals (say 1kHz and up) its not an issue. You can, of course, increase sample rate manually to speed up acquisition time, but the limited 32k sample memory sets the practical limit on how much of the waveform can be viewed WRT the selected sample rate. And noise goes up as sample rate is increased (by necessity, as nyquist bandwidth increases).These aren't bad scopes, but you really need to get a good deal to make it worth it. Some issues that might appear are low/dead volatile memory backup battery and faulty attenuators (the attenuation elements are fine, the actuators get stuck or won't reliably switch ranges). Other than that, these are pretty reliable and decent for their vintage--mid 90s. It's possible some cheap-ass Chinese scope may better fit your needs, as integrated circuit technology has improved so much that the grey beards from mega corps like HP and Tektronix aren't needed to make basic 100+ MHz scopes now-a-days.

author: garrettm
author_rank: Frequent Contributor
timestamp: February 02, 2025, 12:15:31 am
content: Something to think about is what active probes you have. I have a bunch of HP probes that are supported by the 54542C's rear probe power connector, but it isn't as good as using the dedicated probe power supply that allows for better DC offset adjustment and lower frequency AC-coupling.Here's some photos of a homemade charge line pulse gen measured with my scope. And a few more of compatible probes.
Amplifier Research 1W1000 manual/service manual - Page 1
Forum section: electronics / testgear

author: implor
author_rank: Regular Contributor
timestamp: January 31, 2025, 09:08:41 pm
content: Hi.I got an Amplifier Research 1W1000 RF amplifier and is wondering if someone has a PDF manual or service documentation?I'm also looking for information how big difference it is between 1W1000 and 5W1000. Is it just the output amplification stage that's different?

author: coromonadalix
author_rank: Super Contributor
timestamp: February 01, 2025, 11:59:30 am
content: only doc ive seen so far

author: implor
author_rank: Regular Contributor
timestamp: February 01, 2025, 01:47:36 pm
content: Quote from: coromonadalix on February 01, 2025, 11:59:30 amExactly the same I found online. I have seen manuals on eBay for higher end models but right now 1w1000 is missing.
Choice of two oscilloscopes:   HP 54542A or Lecroy LeCroy 9354TM - Page 1
Forum section: electronics / testgear

author: StrayElectrons
author_rank: Contributor
timestamp: January 30, 2025, 07:59:12 pm
content: Looking for a 500MHz scopes and I'm willing to repair either one.Studied both models specs and both are very similar.HP 54542A might need battery backed cell replaced based on the issue symptoms only that calibration failed.Lecroy 9354TM might need more work, passes internal tests and calibration except channel 3 input is not generating signal.And slow to respond to button inputs. CRT has burned in where lines and text had been there for long time but still usable.Seller's description says:"The unit passed POST, self test, internal calibration & diagnostics. Performed verification test and passed (but not all done due to lack of matching equipment). Being sold for parts due to CH 3 Input not working (doesn't generate any input signals, all other channels are working). And, the unit responds time very slow. There is a delay of 5 to 10 seconds before any input commands shows up on the display screen. "Had tried to search here and internet searches related to repair or mods on this Lecroy 9354TM and I came up nothing. Hopefully anyone knows these could respond.Lecroy has several sub models for the 9354 including 9354A.Thanks for your responses.Cheers,

author: bobxyz
author_rank: Contributor
timestamp: January 30, 2025, 09:57:50 pm
content: "Quote from: StrayElectrons on January 30, 2025, 07:59:12 pmSeriously??? #2 link from a google of "lecroy 9354 service manual" is:https://ia902804.us.archive.org/26/items/LeCroy_9354A-M-L-TM_Service_Manual_Complete/LeCroy_9354A-M-L-TM_Service_Manual_Complete.pdf(Instead of repairing an old scope, I'd get an entry-level Rigol and Siglent 4channel 500MHz scope.)

author: StrayElectrons
author_rank: Contributor
timestamp: January 30, 2025, 11:12:08 pm
content: Good suggestion, but the cost is 5 to 8 times costly for Siglent or Rigol when one factored in the Canadian pulp paper, aka toughest, colourful plastic sheets.These used either one, can snatch one for around 300-400 CDN, shipping cost included.Besides, I enjoy repairing these as money comes in over time.

author: nctnico
author_rank: Super Contributor
timestamp: January 30, 2025, 11:31:45 pm
content: I'd look for one of the Tektronix TDS500 or TDS700 series (don't buy the TDS600 series as these don't have peak detect!).
Are people interested in new front labels for BW upgraded TEK. TDS3000 scopes? - Page 1
Forum section: electronics / testgear

author: benj38
author_rank: Frequent Contributor
timestamp: March 22, 2024, 08:20:41 pm
content: I guess that quite a few forum members have upgraded the bandwidth of their Tektronix TDS3000 series scopes. As a result, the front-panel label no longer indicates the true identity of the upgraded scope. For example, it may say TDS3032 300MHz 2.5GS/s, when in reality the scope is now a TDS3052 500MHZ 5GS/s unit.I was thinking that it would be nice to have new front-panel labels manufactured that would be as close as possible to the original labels that were fitted to the higher BW models.Note that replacing the label is mainly for aesthetic reasons, as the serial-number label on the back would still indicate the old identity of the scope.Unfortunately, the original labels are silk-screen printed in 4 spot colors on 10mil Lexan, and are quite expensive to manufacture in small quantities. However, if we spread the cost it may be worth the effort.It looks like if 20 people are interested, each one can get 4 (not necessarily identical) labels from TDS3052, TDS3052B, TDS3054, or TDS3064B, for about $15 per person. If more people are interested, we can even get it down to $10 per person with first-class mail shipping included in the US.I can also enlist the help of a friend in Europe for the benefit of our EU friends.If there is interest, I can handle the whole process, and mail the labels around.I do not know if this post is in the right place or not, and what is the correct way to gather the list of interested people, so please let me know what is the accepted way to do this.

author: tonykara
author_rank: Contributor
timestamp: March 23, 2024, 08:31:01 pm
content: Yes!!!!! I replied to you over on the tek forum, but I wanted to reach out to you here as well.

author: JMcC
author_rank: Contributor
timestamp: April 12, 2024, 09:12:00 pm
content: I'd have an interest in this as well.JMcC

author: matth
author_rank: Contributor
timestamp: April 22, 2024, 06:35:06 am
content: I would be interested in a TDS3054 label.

author: RolandK
author_rank: Regular Contributor
timestamp: May 18, 2024, 06:04:41 am
content: Very fine. if not to late:1x 30544x 3064bgoes to europe

author: PaulM1234
author_rank: Newbie
timestamp: December 16, 2024, 07:51:17 pm
content: Did you ever end up with any leftover stickers?I've just gone on a bandwidth-hacking spree at work and I'd love to buy some 3052 and 3054 stickers if there were any left...Cheers,Paul

author: uggy
author_rank: Newbie
timestamp: December 17, 2024, 11:03:00 pm
content: Maybe it is time for another batch?

author: BobBeBob
author_rank: Regular Contributor
timestamp: January 28, 2025, 03:06:04 am
content: I will take a couple of tds3054 and 1 tds3043B

author: benj38
author_rank: Frequent Contributor
timestamp: January 30, 2025, 04:53:16 pm
content: I did end up making some labels, so if anybody is interested please PM me.
Keysight / Agilent N9000A Spectrum Analyzer - Page 1
Forum section: electronics / testgear

author: mattik
author_rank: Newbie
timestamp: January 30, 2025, 02:32:00 pm
content: Hi all,I recently sourced an "for parts or repair" N9000A that has a PSU issue.The analyzer wont start at all, looking at the midplane board LEDs and measuring from the testpoints the 5 volt standby voltage is present but the 15 volt standby voltage is not.The PSU unit itself doesn't have any burnt components, blown caps etc. on the PCB.The PCB doesn't have any useful silkscreen and as the documentation doesn't list any pinouts the thing is quite difficult to measure. The PSU type is TDK-Lambda CWN200AGL, Keysight P/N 0950-5093. Apparently a compatible model is Cherokee International SP595-2A, Keysight P/N 0950-4894.Would soneone happen to have any experience with fixing these/experience on any typical problems? A schematic or pinout would help a lot in finding out what should go where. Any help would be greatly appreciated!
Anrtisu SiteMaster S331L stuck in Loading OS mode - Page 1
Forum section: electronics / testgear

author: EIKA
author_rank: Contributor
timestamp: October 10, 2020, 11:08:19 am
content: Hi all!I come across with a problem. When I tried to upgrade firmware on my SiteMaster S331L from 2.90 to 4.00, process failed with error message: Could not find file V4.00_SM-L.bin. Even when that file in place.Now device shows:CPL V1.4Loading OS… Anrtisu SiteMasterAnd stuck in this modeI believe that problem can be fixed via forced bootstrap mode, but sadly I can’t fine information how to get there in S331L model. S331E model offers Shift + 4 + 0 + Power On for this mode, but L model has no Shift button.Any ideas?

author: EIKA
author_rank: Contributor
timestamp: October 12, 2020, 05:41:25 pm
content: S331L forced bootstrap mode (secret key combination, never described):Connect external power supplyTurn device offHold down 4 + 5 + 6 and briefly touch Power button (for 1-2 seconds). Then, release Power button, but keep holding 4 + 5 + 6 .Here you go - bootstrap app will load in 15-20 secondsUse Update firmware button thenP.S.WARNING! Do not use huge USB sticks with S331L. 32GB sticks and especially PNY sticks might kill your device during FW upgrade. Use 8GB or smaller sticks from SanDisk or Kingston.

author: dannyazs
author_rank: Newbie
timestamp: May 03, 2024, 04:36:42 pm
content: Thank you, The solution worked, and its probably the same on the S820E as well. Really unfortunate that anritsu wouldn't include that into any of their manuals or update procedures, unless i missed it somehow. Been looking into it for a few hours and the manual only specifies that the SOM or main PCB need to be replaced.

author: vishaldotgupta
author_rank: Regular Contributor
timestamp: February 02, 2025, 06:12:23 am
content: HiI have a issue with s331L. When i press power button the charge light turns solidamber and power led is green flashing.No change in status with charger connected or disconnected.I even removed batter and just with charger connected. Same status.Both battery voltage around 7.5 volts.Any idea how to troubleshoot
OQ 0260 ASIC failure for which generation of Fluke scopemeters? - Page 1
Forum section: electronics / testgear

author: shockpoint
author_rank: Contributor
timestamp: June 12, 2024, 12:43:04 am
content: Hi all,based on research on this and other forums it seems that the Philips OQ 0260 ASIC chip in a few models of scopemeters including the 99, 97, 192, 196, 199, were causing trace problems.I also understand that sourcing the OQ 0260 is quite difficultIs there a rule of thumb of which models have this rare chip in them?I am looking at a 105B scope meter and I am wary of purchasing it because if it breaks then I do not have the means to repair it - I have done a search for OQ0260 scraps on ebay but they don't come cheap!

author: mnrmaster
author_rank: Newbie
timestamp: January 30, 2025, 08:00:00 am
content: Hi. I'm looking for it too, I can't find it
Riden 6018 damaged during LED ON/OFF mod - Page 1
Forum section: electronics / testgear

author: NickyDoes
author_rank: Contributor
timestamp: September 25, 2024, 12:19:57 pm
content: I was attempting to add the output on/off red LED mod to a RIDEN RD6018. In the process, I blew a pin on the STM32 microcontroller that drives the green on/off LED. I have a replacement STM32 and can replace the component, but I do not know how to initially program a STM32. I have a ST Link V2 and I see what looks to be a programming header @ J2. Please point me in the right direction.

author: darkspr1te
author_rank: Frequent Contributor
timestamp: September 25, 2024, 01:31:29 pm
content: You will need a copy of bootloader and firmware, the firmware that comes from Riden is encrypted and is decrypted by the bootloader,i dumped my bootloader+firmware from a 6012 found herehttps://www.eevblog.com/forum/microcontrollers/rd60xx-mcu-controlled-power-units/msg4543973/#msg4543973you might be able to flash that and get to the bootloader, but no promisesdarkspr1te

author: NickyDoes
author_rank: Contributor
timestamp: January 30, 2025, 02:28:51 pm
content: I had put this project aside for quite a while. Flashing bootloaders isn't something I'm good at (yet). I now have a ST Link, and the current device works - just the output for the LED is burned out. I should be able to recover the bootloader from the failed microcontroller, replace the microcontroller, and possibly re-flash the bootloader?I would really appreciate a bit of guidance. I've done similar tasks with the PIC family, but I'm not familiar with the ST parts, and feel a bit out of the water on this.
Siglent SDL1020X-E - Noise when turning over - Page 1
Forum section: electronics / testgear

author: nephilim
author_rank: Newbie
timestamp: January 29, 2025, 04:43:03 pm
content: Hi,today I received a Siglent SDL1020X-E and when taking it out of the box I noticed a rattling noise. I can trigger it by turning it over (top side facing down) and vice versa. It sounds as if a couple of small metal parts are sliding and hitting against something. I found this video (https://youtu.be/8pmkzDK-oZQ?si=h5Mbv3LFrzZYQeZu&t=855) where at 14:15 the noise can be heard. Being no native speaker I have a hard time understanding what might cause it. Do your units make the sound, too? And should I worry?ThanksTorsten

author: Grandchuck
author_rank: Super Contributor
timestamp: January 29, 2025, 04:49:26 pm
content: Ferrite beads are sometimes loosely fitted on wires for EMI suppression, among other reasons. It is normal if that is what is making the noise and there is nothing to worry about.

author: nephilim
author_rank: Newbie
timestamp: January 29, 2025, 04:51:34 pm
content: Fantastic! Many thanks for the quick feedback.
HP 3314A - Function Generator - Intermittent Output - Page 1
Forum section: electronics / testgear

author: MarshallPlexi
author_rank: Contributor
timestamp: January 28, 2025, 03:04:34 am
content: Evening All!I have an HP 3314A that works great. I have recapped it, scraped every ribbon connector pin with a razor blade, and cleaned the female pins of those ribbon cables with contact cleaner, and it's been working great. However today, the output just randomly stops for a second and then resumes. I would swear it's a dirty connection if I hadn't already cleaned all the pins etc.All of my power supply voltages are spot on.I have a couple of repair 3314A's lying around so my question is, which board would you swap out first? I assume the output board under the unit?Thanks!

author: awesomechapro
author_rank: Contributor
timestamp: January 29, 2025, 10:20:16 am
content: I would start by tracing the output signal back through the output drivers and back to the DAC with a scope, to see if the problem is in the output drivers or if it is more of a digital fault.If you've got spare boards I would start by swapping the output board. And as is typically for test equipment made at the time, the 3314A has a very comprehensive service manual, might be worth a look if you haven't already.https://www.keysight.com/au/en/assets/9018-05762/service-manuals/9018-05762.pdf

author: nctnico
author_rank: Super Contributor
timestamp: January 29, 2025, 11:25:06 am
content: Quote from: MarshallPlexi on January 28, 2025, 03:04:34 amYou basically have scraped off the contact plating from the connectors and added acid to speed up corrosion. What you did is completely destroy a good instrument. Throw this one in the bin, it will probably never ever be OK again. Maybe there is a fighting chance if you manage to remove all the contact cleaner and replace all the ribbon cables and connectors with good quality ones but there is a chance you damage the circuit board in the process.For the next one: Just re-seat the connectors. If you want to clean, use a soft cloth and alcohol. No contact cleaner; contact cleaner is a quick fix to use a device for a week or so and then throw it away. As you have learned the hard way.A problem with these units are the SIL reed relays. These can get sticky and need replacing. My unit had the symptom working well when cold, but start acting up after using it for a while. Replacing the SIL reed relays fixed that.
Keithley SMU 2450 2470 Sweep using SCPI commands with PyVisa - Page 1
Forum section: electronics / testgear

author: slow_rider
author_rank: Regular Contributor
timestamp: January 29, 2025, 05:00:29 am
content: I had a LUA script that ran from Keithley's TSP, I had to translate it into SCPI commands to run with a Python script.In the LUA script the sweep is set-up, initiated and then there is a command that waits until the sweep is over before reading the buffer with the measurements:Code:smu.source.sweeplinearstep("configListName", start, stop, step, sDelay, count, rangeType, failAbort, dual, bufferName)trigger.model.initiate()waitcomplete()-- Print readingsprint("Current  / Voltage  / Rel. Time ")for i = 1, defbuffer1.endindexdoprintbuffer(i, i, defbuffer1.readings, defbuffer1.sourcevalues, defbuffer1.relativetimestamps)endI've tried to translate it, perhaps in a naive way, to SCPI and right now I have something like this:Code:smu.write(scpi_command)# Start the sweepsmu.write("INIT")smu.write("*WAI")start_index = int(smu.query(f':TRAC:ACT:STAR? "{buffer_name}"'))end_index = int(smu.query(f':TRAC:ACT:END? "{buffer_name}"'))data = smu.query(f'TRAC:DATA? {start_index}, {end_index}, "{buffer_name}", READ, SOUR, REL')I've managed to get this to work, however it seems that *WAI does not do anything (?) and the only way to get this to work is to set timeout to a large enough value so it won't timeout while running the sweep. This does not sound like the best way to do this, hope someone has any suggestions how this should be implemented? Help will be appreciated!
Frequency Linearizer EPROM re programming after YIG replacement Wiltron 6659a - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: January 29, 2025, 09:24:38 am
content: Hello,I have a Wiltron 6659a sweeper (none synthesized) where one of the 4 YIG:s went bad (12-18GHZ), after replacement with another YIG , the frequencies between 12-18 GHZ are little off since the current linearizer EPROM (2716) matches the old YIG, any info about the format of the EPROM to do a manual reprogram? attached the content of that EPROM. Thank for any help!
Multmeter wont read Amps - Page 1
Forum section: electronics / testgear

author: DordrechSeahog
author_rank: Newbie
timestamp: January 29, 2025, 03:35:29 am
content: Somthing funky is going on with my multi meter. It wont read amps in the mA uA port and when it try to read the Amps using the 10A port it arc on the probe, causes the surge protecton to trip on machine im trying to get a read off of. I can only get it to read amps in the voltage port but then i get 2 diferent readings of 1.5mA and 0.298A respectively. What am I doing wrong here?

author: joeqsmith
author_rank: Super Contributor
timestamp: January 29, 2025, 03:54:56 am
content: Quote from: DordrechSeahog on January 29, 2025, 03:35:29 amGuessing you blew a fuse and did not read the manual or understand how to use the meter?

author: garrettm
author_rank: Frequent Contributor
timestamp: January 29, 2025, 04:00:05 am
content: Check your fuse, you probably blew it.How are you measuring the current? (An ammeter needs to be placed in _series_ with the load.)Also, are you measuring DC current or AC current? If your DMM is set to AC current and you want to measure DC current, you will get nonsensical readings.

author: sleemanj
author_rank: Super Contributor
timestamp: January 29, 2025, 04:42:04 am
content: From your description, 99% likely that you tried measuring current in parallel, instead of series, and you now have at best a blow fuse, at worst a damaged meter.You may find thismultimeter notes for beginners PDFhelpful, I used to sell basic cheap multimeter to beginners and always included this, to my knowledge, nobody blew their meter up, so either I had smarter than average beginners, or it might have been useful (note your meter might have different capabilities than the PDF describes, but the principles are the same).
Hameg HM8134 how to enable calibration mode - Page 1
Forum section: electronics / testgear

author: msuthar
author_rank: Contributor
timestamp: January 28, 2025, 09:42:48 am
content: Looking for the method to put HM8134 RF frequency Generator to calibration mode.Any key combination while booting? or any special code?Eprom dump shows it possible to put this unit in cal mode but how it is unknown.
HIOKI DT4282 OHMS CALIBRATION - Page 1
Forum section: electronics / testgear

author: walter.aranda
author_rank: Contributor
timestamp: January 28, 2025, 07:55:43 am
content: I recently acquired a HIOKI DT4282, and during various tests, I noticed something I didn't like. While its ohm measurement resolution is higher than the 189, when I tested it with a shunt (one of those Chinese ones), the initial reading it displayed was a negative value! (-0.005 ohms). I’ve read the manual and can’t find a way to calibrate this value. Although REL can be used to zero it out, one would expect a new multimeter not to have this kind of issue. In the image, I show a comparative photo with the DE-5000 (previously calibrated). Could someone help me or perform the same test? Has anyone else experienced this?

author: 2N3055
author_rank: Super Contributor
timestamp: January 28, 2025, 09:24:34 am
content: Don't mess with the meter. It is perfect as it is.Hioki itself calibrates (tests for accuracy) by using REL on 60 and 600mV DC and up to 60kΩ ranges for resistance.See:https://www.hioki.com/euro-en/download/40099Make note that it can show up to ±0.020 Ω on display in 600 Ω range and still be in specifications. Yours is 4x better.±0.005 Ω is less than uncertainties of the measurements. Just ignore it. Resistors you are measuring will change more than that from tempco while you are touching them during measurement.If it bothers you visually, use REL.This is how it is supposed to be used for best accuracy. Short probes together and REL. In resistance measurements it will also (mostly) compensate for resistance of cables with which you are measuring.
The possibility of installing USB platform on TDS3000 oscilloscope - Page 1
Forum section: electronics / testgear

author: button.ch
author_rank: Contributor
timestamp: September 30, 2024, 07:42:53 am
content: Hello everyone, I have owned two Tektronix TDS3000/B for a long time. Following the guidelines of this forum post, I installed a floppy drive simulator. But I'm still not quite satisfied. I accidentally discovered a USB enabled chip and wanted to install it on the TDS3000/B. I'm struggling to find corresponding contacts for several related functional ports, and I don't knowhttps://hackaday.io/project/172242-extension-card-for-tds3000-scopes/log/179520-the-actual-informationsDoes the description of the 100 pin port function in this link correspond to the function shown in the attached image. Especially the four functions of INTRQ, NRD, nCS, and nWR. I would like everyone to evaluate my idea and how likely it is to be implemented? Thank you everyone!

author: BobBeBob
author_rank: Regular Contributor
timestamp: January 28, 2025, 03:01:25 am
content: hi, how are you doing. that is a good one, did get it done? could input follow up of progress?, please.
Fluke PM3370B - AutoCal Error Code - Page 1
Forum section: electronics / testgear

author: Ghostrider66
author_rank: Newbie
timestamp: January 27, 2025, 05:23:47 pm
content: Inspired by the video from Dave two years ago (https://youtu.be/CLBEe_p-xhM?si=Em34whMvdNx--KqM) I bought a Fluke PM3370B which had some minor bugs (flat cable broken).I found a very good service manual for this device and could fix all visible bugs.But one problem remains: After AutoCal the device shows error "1da". In the service manual there are no further informations regarding the error codes (only that the code will give a hint where the problem is located).Does anyone know what this code means (where I have to seach for the error) ?Many thanks !
Multimeter Probe-Clips - Page 1
Forum section: electronics / testgear

author: 2X
author_rank: Frequent Contributor
timestamp: January 28, 2025, 08:38:32 pm
content: Hi,do you know the brand or a part numer of the below Multimeter Probe-Clips that Dave used on the video "EEVblog 1655 - How to Discharge Capacitors SAFELY using a Multimeter!"? Also if you know another brand like these probes with "clip hook" please tell me.

author: mwb1100
author_rank: Frequent Contributor
timestamp: January 28, 2025, 09:41:52 pm
content: Fluke calls their version "SureGrip Alligator Clips" (part# AC220). But there doesn't seem to be a universally used name for them, so it's really hard to search for other brands or generic versions - you get inundated with regular alligator clips or hooks. But I'm sure they're out there.

author: Mad Axeman
author_rank: Contributor
timestamp: January 28, 2025, 10:16:29 pm
content: Try a search for 'test lead hook clips'. Found them on RS that way.

author: Kean
author_rank: Unknown
timestamp: January 29, 2025, 12:38:01 am
content: The search term to use is "parrot test hooks".I believe that the original ones are from a company called Parrot Invent.https://parrot-invent.com/I personally used a set for years on one of my DMMs, until the push rods broke from rough handling in my tool bag.

author: mwb1100
author_rank: Frequent Contributor
timestamp: January 29, 2025, 01:04:01 am
content: Quote from: Kean on January 29, 2025, 12:38:01 amOh! I thought what Dave was using were alligator clip style things (like the Fluke AC220's). I now see that he's using the parrot clips. They're a lot more reasonably priced than the AC220's to boot. Even with shipping to the US = $25, it's still much cheaper than Fluke's set.
Siglent SDM3045x/3055x-e dump nand plz - Page 1
Forum section: electronics / testgear

author: DemasPPC
author_rank: Newbie
timestamp: January 26, 2025, 03:31:28 pm
content: Hello everyone, please share the dump for this siglent sdm3045/3055 multimeter.

author: tautech
author_rank: Super Contributor
timestamp: January 26, 2025, 03:43:57 pm
content: Why NAND dump ? ?SDM3055 & SDM3045X are different models with different HW.What is the problem with this SDM3055 ?Image is not of SDM3045X or SDM3055X-E.

author: DemasPPC
author_rank: Newbie
timestamp: January 27, 2025, 03:06:58 pm
content: The multimeter was under repair before me, when I got it it wouldn't turn on. We need a nand memory dump to restore the firmware. The special USB recovery file received here on the forum does not help, because the contents of the nand are corrupted. With the nand firmware from Siglent SDG 2042X, I was able to start the multimeter from the generator menu, but the buttons were partially working...I was unable to select the firmware from the usb stick for the multimeter. I have a main board SDY8.007.075F DMMD-161000

author: tautech
author_rank: Super Contributor
timestamp: January 27, 2025, 03:28:34 pm
content: We also have other methods to recovery these.Please confirm model.
HP 54835A or HP 54542A oscilloscope choices. - Page 1
Forum section: electronics / testgear

author: StrayElectrons
author_rank: Contributor
timestamp: January 27, 2025, 03:54:00 pm
content: HP AGILENT 54835A is nice to have but need to reload software (can get), yet needs to and check rest of it for 999 canadian dollars, non refundable. But hackable to 54845A if I read correctly.HP 54542A is nice green, clean and bright CRT 500MHz 4 channel scope with all channels at 2GSA/s each. Older, and very cheap price which is firmly in my budget, might be NVRAM IC battery empty causing calibration failure as I did research for several causes, of one of these is about this.HP 54835A is in Canada, but willing to pay the shipping out of country.Background:I have a 100MHz goldstar scope given to me by a friend but the vertical traces is invisible while horizontal traces is visible and I could not see how to adjust atrigment. Had B&K precision scope since new, and was not inclined to hold on it when business closed, and was not up to quality standards and difficult to lock & stabilize to view waveforms so had to use different scope at work back in the day (around 2003-2009), now prefer to acquire an quality scope for my use at home.If anyone selling a quality like HP, or Tektronix, Lecroy or straight scope or quality PC based, like the 54835A is, 1GHz or 500MHz scope that needs repair, feel free to chime in.Cheers,
Rigol DHO800/900 series 15.6 inch  Touch screen for misers - Page 1
Forum section: electronics / testgear

author: nikolatesla
author_rank: Contributor
timestamp: January 27, 2025, 07:01:31 am
content: Hi all,I could not find a specific thread for this .I purchased the cheapest 1920 1080 touch screen that I could find from Alihttps://www.aliexpress.com/item/1005007791659741.html?spm=a2g0o.order_list.order_list_main.73.60681802XDbocNThere are 3 selections which make it easy to order the lesser quality ones.I found that the main weakness for me was my fingers are too big for most touch screens . This has the problem solved.It works very well it has run for 1 week non stop and all is well . It takes power from the usb2 port of the scope.15.6" seems ideal for me so far.The touch screen power , and the touch panel/mouse, all run in the same cable.So just hdmi and usb2 to usb cYou will need to supply a usb2 to USB c cable which is not included.It also comes with a cheap and nasty 5v 3 amp wall wart power supply which is not needed.It may work better with a 4k screen but Im happy with this cheap option .I hope this has been of help to others with sausage fingers like mine .

author: Fungus
author_rank: Super Contributor
timestamp: January 27, 2025, 02:19:41 pm
content: You're running a screen off the DHO800's USB port??Me? I'd want to measure the current draw of that...

author: coromonadalix
author_rank: Super Contributor
timestamp: January 27, 2025, 02:38:16 pm
content: same hereyou may push the power consumption outside the design and overheat parts in it, do a current check
How to do a memory dump to a thumbdrive on an SDS3000HD - Page 1
Forum section: electronics / testgear

author: CrabApple
author_rank: Newbie
timestamp: January 26, 2025, 04:31:25 am
content: I'm new to this scene but I'm trying to learn about it and need some pointers. Thanks guys!

author: H.O
author_rank: Frequent Contributor
timestamp: January 27, 2025, 06:02:17 am
content: I believe what you're looking for is described in section 33 inthe manual. It sounds to me like you want to select either .bin or .csv depending on what you need to do with the data after the fact. There's aseparate documentdescribing the .bin file format.
Hantek-dso4202C stuck at boot screen - Page 1
Forum section: electronics / testgear

author: ubata
author_rank: Contributor
timestamp: January 25, 2025, 06:08:32 pm
content: To avoid duplication, please refer to the post below. I have explained my problem in detail.Thank youhttps://www.eevblog.com/forum/testgear/voltcraft-dso-1084e-(hantek-dso4084b)-stuck-at-boot-screen/msg5795225/#msg5795225

author: ubata
author_rank: Contributor
timestamp: January 26, 2025, 04:15:27 pm
content: no one can help me?
Questions about 54542C scope. - Page 1
Forum section: electronics / testgear

author: StrayElectrons
author_rank: Contributor
timestamp: January 26, 2025, 02:11:14 pm
content: Hi,Seller is selling this HP 54542C with 4 channel calibration failures. Does not clarify what errors says.Price is just right.I might buy this, but I noticed that 54542C would use color LCD according to product data but this is green monochrome CRT. Might be front plate replaced?This scope capable of live waveforms?Cheers,
LeCroy 9400 Scope repair - reverse engineering the input hybrid chip - Page 1
Forum section: electronics / testgear

author: Gulftown
author_rank: Regular Contributor
timestamp: January 26, 2025, 04:42:49 pm
content: Hi,I've been trying to repair my old Lecroy 9400 for a while now and i am certain, that the problem lies within its input attenuator hybrid chip.There are no such chips as spares available anywhere and because i have nothing to loose here, i am trying to reverse engineer the chip.I made some high res pictures of the delidded chip and figured out most of the components.I still need to figure out some components and their pin-outs.Can someone maybe help me to figure out what those components are and what kind of transistors they are?EDIT: I moved this to the Repair thread. Please answer there.Quote from: Gulftown on January 26, 2025, 04:54:08 pm
Faulty KP184 Purple PCB - Page 1
Forum section: electronics / testgear

author: ctesla75
author_rank: Contributor
timestamp: November 02, 2024, 01:55:02 am
content: Hi All,We use 20 KP184 at work for testing, all work ok with slight ripple , we have modded a few with suggestions from eevblog and improved the ripple. Will eventually do the rest. We recently bought three more from a different seller. And have had huge problems , we calibrate on the constant resistance setting, it jumps about so much that calibration is not accurate enough. The old units were not as bad. The seller has offered solutions but mainly saying increase resistance, and now out of ideas. I cannot find the manufacturers email to ask them. Has anyone had this problem PCB VER 0.71 purple all the old ones are blue .041 i think. ThankyouCtesla75

author: hp3310a
author_rank: Regular Contributor
timestamp: February 02, 2025, 12:05:58 pm
content: So did you get this sorted out?

author: ctesla75
author_rank: Contributor
timestamp: February 02, 2025, 01:46:59 pm
content: Unfortunately not the seller we bought through have not been a great help , they say engineers will look for a solution but have found one. The pcb is visually different smaller footprint smd transistors for example. And still no way of contacting manufacturer that i could find. Would still love a solution
R&S TUNER.0,1-1000MHz. ZPV-E2 - Page 1
Forum section: electronics / testgear

author: frantisek
author_rank: Regular Contributor
timestamp: January 26, 2025, 10:39:28 am
content: Hello. Does anyone have, please!!, manual , schematic or at least wiring diagram of RohdeSchwarz receiver connector : TUNER.0,1-1000MHz. ZPV-E2? Thank you very much in advance!
Keithley Kickstart Software.......... - Page 1
Forum section: electronics / testgear

author: Smokey
author_rank: Super Contributor
timestamp: January 05, 2024, 12:43:34 am
content: https://www.tek.com/en/products/keithley/keithley-control-software-bench-instruments/kickstartIt sure looks nice to be able to drive some of this equipment with an off the shelf piece of software, but damn is it expensive. I'm not super excited about having yet another piece of software on subscription either.Is Kickstart worth it?Also, it sounds like at least the basic functionality was free in previous versions. Is that true? If so, does anyone have a link to the installer for whatever the last free version was?

author: coromonadalix
author_rank: Super Contributor
timestamp: January 05, 2024, 11:23:33 am
content: Better develop in python or else, i think they killed the momentum ...https://github.com/alson/python-ivi/tree/staging/ivi

author: jan28
author_rank: Contributor
timestamp: January 06, 2024, 11:00:47 am
content: And if you want more visual development for controling one or more instruments: EEZ Studio using dashboards and flow (https://www.envox.eu/studio/studio-introduction/). It's open source.

author: Smokey
author_rank: Super Contributor
timestamp: January 06, 2024, 09:46:42 pm
content: I do use python for everything up to now. It's just a little frustrating that none of the open source projects have very complete SCPI command coverage of the features for some of the less common instruments, like the Keithley 2700 DMM/Scanner. For example, nothing I've found has implemented the command to check the EEPROM relay closure count on the cards. I would have expected that to be straightforward, but just issuing the command times out so there must be some setup sequence I'm missing. It would be nice to just have that basic functionality working out of the box with something like the vendor supplied software (Kickstart in this case).

author: Smokey
author_rank: Super Contributor
timestamp: January 12, 2024, 05:15:36 am
content: Can anyone verify the idea that at some point at least a basic version of Keithley Kickstart was free? If so, when did that stop?

author: ArdWar
author_rank: Frequent Contributor
timestamp: January 12, 2024, 10:51:47 am
content: Quote from: Smokey on January 12, 2024, 05:15:36 amhttps://www.tek.com/en/support/faqs/i-see-that-kickstartfl-base-is-going-away

author: jjoonathan
author_rank: Frequent Contributor
timestamp: January 12, 2024, 02:26:25 pm
content: Kickstart = kick you to start learning python

author: Smokey
author_rank: Super Contributor
timestamp: January 13, 2024, 04:08:08 am
content: Quote

author: Smokey
author_rank: Super Contributor
timestamp: January 25, 2025, 04:03:55 am
content: Interesting. I guess there was another piece of software called Testpoint that was also free, that they got rid of.https://docs.ampnuts.ru/eevblog.docs/Keithley/2700/2700-2750_SW_Selector.pdf

author: KungFuJosh
author_rank: Super Contributor
timestamp: January 25, 2025, 04:12:43 pm
content: I use TestController with all my bench gear, including my Keithley DAQ.
Siglent "S bus cable" - Page 1
Forum section: electronics / testgear

author: rwgast_lowlevellogicdesin
author_rank: Frequent Contributor
timestamp: September 22, 2020, 06:32:52 pm
content: A while back I purchased an 1104 scope and shelled out the cash for the logic probe. The probe has just been sitting in a drawer and I forget to use it for that reason! Anyways the way the probe plugs in to the scope makes for a messy ackward work area and that's why I dont have it permanently set up. I'm in the middle of building new shelving for my bench and I'd like to run the sbus cable straight down through the shelf top the scope is on to a lower shelf dedicated to smaller pieces of gear. So I guess the question is, can I just use hdmi cables and right angle connectors, or are the "s bus cables" built in such a way that I risk damaging equiptment or crossing channels with a regular hdmi cable. I looked through all kinds of siglent docs and can not seem to find any information on s bus cables or even an option to buy them, so I'm assuming it's an hdmi cable but want to make sure!!

author: tautech
author_rank: Super Contributor
timestamp: September 22, 2020, 09:32:47 pm
content: Just checked for you.Unfortunately when using a cheap 1m HDMI cable the SLA1016 LA module is not recognized by the DSO.The SLA1016 module powers up just fine and the Ready light comes on but the DSO doesn't know it's connected.Other better HDMI cables might give a different result IDK.

author: kerouanton
author_rank: Regular Contributor
timestamp: October 20, 2021, 09:52:01 am
content: I confirm. Tested with several brands of HDMI cables without any success. I also tried to use the original Siglent S-BUS cable with a right-angle adapter without any success either. In the future it yould be useful to get the cable wiring diagram, I doubt there are any active components inside.

author: WowSuchName
author_rank: Newbie
timestamp: January 25, 2025, 10:38:14 am
content: Hey everyone,I know it's an old thread, but this might still be relevant to some: for me, a cheap 1m HDMI extension cable works just fine with the original SBUS cable for connecting the SLA-1016 to my SDS 1104X-E.Best regards,WowSuchName