hybridfree/eevblog-posts huggingface dataset:
NGMO1 0-15V 0-2.5A power supply teardown (Rohde & Schwarz) - Page 1
Forum section: electronics / testgear

author: thmjpr
author_rank: Regular Contributor
timestamp: May 25, 2013, 09:21:41 am
content: NGMO1 multi-feature power supply (manual).Basic specs:- 0-15V at 2.5A- Ripple + noise: <1mVrms- Set resolution: 1mV, 1mA- Read resolution: 1mV, 200uA/10uA/0.1uA (depending on range)- Accuracy: 0.05 % +5 mV, +/-10mA- 1A+ current sinkFront of the supply. Rotary encoder broken during shipment and will have to get a replacement (ECW0J-B24-AC0006).Oddly someone had sharpied over the "Made in Germany" text in the bottom right.Bottom of the unit contains the main processor, communications, and bulk capacitance. Caps are 85C rated but I can't see this board getting very warm.Proper mains switch seen crossing the top. Minimal input filtering on the top left.LEDs for various rails: 5V, +/-8V, 16V, 24V.Opto's going off to output section on the other side.- 16-bit micro (C167CR-LM)- 8mbit flash (M29F800)- 64K eeprom (at28hc64b)- 2x1Mbit SRAM (HY628100B)Top side of the PSU which contains either one or two mirrored supply boards + transformers.- opamps: OP27, OP275, AD823, AD825, AD829- 8-bit DAC (DAC08)- 16-bit "low glitch" DAC (LTC1650)- 12-bit dual DAC (LTC1446)- 16-bit 195kSPS delta-sigma ADC (AD7722AS)- 24-bit DSP (DSP56303PV100)- 2x256K SRAM (IS61LV256)A lot of the advanced functionality isn't usable via the front panel. A bit of a shame but expected as you would normally be using the PC analysis software (don't have it).

author: robrenz
author_rank: Super Contributor
timestamp: May 25, 2013, 01:02:34 pm
content: Nice unit and pictures, what do these go for $ ?

author: thmjpr
author_rank: Regular Contributor
timestamp: May 25, 2013, 08:28:46 pm
content: Quote from: robrenz on May 25, 2013, 01:02:34 pmThank you. Retail is something like $4500, but they are not popular used.Used prices for NGMO1 usually $3-400, NGMO2 $800.I was able to purchase for much less from ebay userszmateton. He offered to sell more units if anyone else is interested.

author: orion242
author_rank: Unknown
timestamp: January 27, 2019, 06:32:47 pm
content: Tearing into mine and figured I would add more pictures of the analog board...took off all the clothes. Above 10v it goes unreg, so in we go...

author: Qw3rtzuiop
author_rank: Frequent Contributor
timestamp: February 18, 2022, 09:26:46 am
content: Ive been asked here how i done the display swap:https://www.eevblog.com/forum/buysellwanted/(fs)(eu)rohde-schwarz-ngmo2-dual-channel-analyzerpower-supply/The acrylic glas need to be changed to enhance the vfd contrast. I used 3mm grey tinted acrylic glas.The vfd is a VFM202MDAR2-1. They are hd44780 compatible. You can get them on aliexpress and they are also in some cash registers.Some jumpers need to be adjusted (parallel and M68 mode) and the connection cable needs to be soldered.And while youre in there you should change the RIFA input caps. Why? Take a look here:https://www.eevblog.com/forum/chat/old-rifa-capacitors-and-a-disaster-story/On the picture they are already changed.
KS34465A Zero readings - Page 1
Forum section: electronics / testgear

author: mawyatt
author_rank: Super Contributor
timestamp: February 14, 2022, 06:20:40 pm
content: We have a couple KS34465A, one is ~month old, other over a year old.When reading a zero volt shunt (banana adapter with #12 Cu wire shunt) we get readings from each DMM that differ by 1~2uV. The older 34465A agrees well with the newer DMM6500 we have, but new 34465A is a couple uV different.All usual precautions warm up, self cal, all shunts swapped between all 3 DMMs, and so on.Know the reading is well within spec, just curious about what others with KS34465A are seeing??Interested in only folks with an actual KS34465A, and no "speculation" please!!Just curious to "see" what might be the spread in these specific DMMs, and don't want to create another "my DMM is better than yours thread"Thanks in advance.Best,

author: Grandchuck
author_rank: Super Contributor
timestamp: February 14, 2022, 09:08:24 pm
content: Short was #12 wire with banana plugs. Warmup was 30 minutes.
Somthing Pretty SC3100  - Page 1
Forum section: electronics / testgear

author: KG7AMV
author_rank: Frequent Contributor
timestamp: February 14, 2022, 05:25:03 pm
content: I have a Sencore SC3100 now

author: commongrounder
author_rank: Frequent Contributor
timestamp: February 14, 2022, 10:04:52 pm
content: I’ve had mine for decades and it still works great. It has been perfect for working on tube amps. With the matching probes the max input voltage is 2kv. These days those probes are probably worth more than the scope itself. Take good care of them.
Rohde and Schwarz UPL Digital I/O option - Page 1
Forum section: electronics / testgear

author: simingx
author_rank: Contributor
timestamp: February 14, 2022, 06:11:25 pm
content: Hi all…I recently picked up an UPL with what seems to be 2/3 of the 96kHz digital interface, because someone rather inconsiderately swapped the front panel with that of a unit without the front panel digital jacks…!Does anyone have some photos of the front panel digital I/O jack board? I’d love to be able to somehow roll my own front panel board. I guess layout shouldn’t be *that* critical right…?Thanks in advance…
Instek GPP-4323 - screen off &fan running continuously - Page 1
Forum section: electronics / testgear

author: pyh
author_rank: Newbie
timestamp: February 14, 2022, 12:48:07 am
content: Hi all,I've just received my instek GPP 4323 power supply. I had only switched it on for 5 minutes, setting the voltage and current on channel one. Suddenly the screen suddenly switches off and the fan runs continuously. There were no pops, bangs or smoke. When I power cycle the unit, the screen remains off, the fan runs continuously and buttons no longer have any backlight.Is there a way to hard reset the unit, rectify this issue?Thank you in advancedCheersPaul

author: nctnico
author_rank: Super Contributor
timestamp: February 14, 2022, 07:31:00 pm
content: Return it; don't mess with it. It is what they call 'dead on arrival'.
Agilent E4416A series power meter - Page 1
Forum section: electronics / testgear

author: Atifmo
author_rank: Newbie
timestamp: February 13, 2022, 06:03:53 pm
content: I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.

author: TimFox
author_rank: Super Contributor
timestamp: February 13, 2022, 06:15:58 pm
content: Your photograph does not show the input connector. What probe is connected?

author: nfmax
author_rank: Super Contributor
timestamp: February 13, 2022, 08:08:04 pm
content: It's not the exact same model, buthttps://www.eevblog.com/forum/repair/(mended)-ep4418b-power-meter-doesnt-turn-on/describes how I fixed a very similar problem in my E4418B

author: Atifmo
author_rank: Newbie
timestamp: February 13, 2022, 09:12:03 pm
content: thank you nfmax for your answer. if you have the schematic diagram please share it. can I make the same modification as you did on E4418B.

author: nfmax
author_rank: Super Contributor
timestamp: February 13, 2022, 09:44:24 pm
content: I found the E4418B information through the link athttps://www.eevblog.com/forum/repair/looking-for-clip-for-hp-e4418b/msg3587360/#msg3587360. The site linked doesn't have anything for the E4416A, but the E4416A service manual on the Keysight website shows the main PCB assembly looking very similar, if not identical to the E4418B. I made a PDF with the relevant bits of the E4418B circuit diagram and component location drawing for the assembly: it is attached to my original post.
Agilent E4416A series power meter - Page 1
Forum section: electronics / testgear

author: Atifmo
author_rank: Newbie
timestamp: February 13, 2022, 06:10:50 pm
content: I have agilent E4416A series power meter. the voltages are ok 12v,-12v, 5v and the battery measures 2.9v the stand by light is on but when I press the power button nothing happens you can help me and thank you in advance.
BK Precision 9111 - Page 1
Forum section: electronics / testgear

author: idris5416
author_rank: Newbie
timestamp: February 13, 2022, 01:29:13 am
content: Hi everyoneToday i received new BK Precision 9111 power supply and tested voltage and current levels looks good but looks like too much noisy, is it normal?https://imgbb.com/tJ4WpByhttps://imgbb.com/0ZXzD7T

author: bob91343
author_rank: Super Contributor
timestamp: February 13, 2022, 01:48:45 am
content: I think 80 mV spikes are too big. What does the specification say?

author: idris5416
author_rank: Newbie
timestamp: February 13, 2022, 01:56:49 am
content: https://ibb.co/1JDnKgx

author: bob91343
author_rank: Super Contributor
timestamp: February 13, 2022, 03:35:34 am
content: Oh boy the ripple is specified at rms and it probably meets that. They were smart enough not to mention peak to peak. I wonder if a capacitor across the output would help much; I doubt it. That's the down side of a switching power supply.

author: idris5416
author_rank: Newbie
timestamp: February 13, 2022, 04:11:21 pm
content: 1N5048 replaced, now 40mvpp still bad but better than switch supplieshttps://ibb.co/Ss9RrGV
Reasonably cheap magnifier lamp OR digital microscope suggestions - Page 1
Forum section: electronics / testgear

author: Infraviolet
author_rank: Super Contributor
timestamp: February 13, 2022, 12:22:42 am
content: I'm trying to decide on a magnification solution for soldering. I've used very fancy digital microscopes before for very fine SMD stuff, but am after something simpler here. The issue is I'm not sure how to select the right sort of magnifier or scope, given requirements about what would be wise focal lengths and magnification factors. And this is doubly hard when going cheap, as for this I'm probably shopping at more "consumer oriented" places without proper datasheet listings.Mostly this will be for soldering, 0603, SOIC, or SOT-23, not finer pitched stuff.This will be for soldering with an iron, not a paste needle. So needs a fair bit of focal length so it can be put reasonably far above the desk level.One of the other key points is for soldering 2.54mm pitched stuff from a more comfortable position than leaning over it, so I can sit back in my chair rather than hunch over. Very easy with a digital microscope outputting to a screen, unsure what the right choice of magnifcation and focal length would be for doing this with a lense-and-lamp type magnifier.If you think the microscope idea would be better than a magnifier, can you recommend any which can go straight to HDMI, VGA or DVI, straight to a monitor, not needing a USB going in to a computer along the way. Also I worry that anything relying on USB might give software compatibility worries.For the magnifier option, can anyone point to a good guide on how much manification, how much focal length below the lense, and how far back your head can be from it, one gets with magnifiers?Thanks

author: Martin72
author_rank: Super Contributor
timestamp: February 13, 2022, 12:37:45 am
content: Hi,I got a Andonstar digital microscope:https://www.welectron.com/Andonstar-ADSM302-DigitalmikroskopIt got enough space to solder under, the visual quality is good, with external monitor excellent.Can make some pics from it, when it´s interesting enough.
Tektronix P6245 Active Probe - Probe connection problem - Page 1
Forum section: electronics / testgear

author: strong-inversion
author_rank: Newbie
timestamp: February 11, 2022, 07:26:53 pm
content: Hi EEVblog!I am trying to connect a used P6245 probe I just bought to my tds744a, and getting the following error.Both are recent purchases from ebay sold as working, an I don't have a known good scope or probe to rule out either.Code:Probe Connection ProblemThere was a problem reading the configuration data from an attached probe.Try removing the probe and reconnecting it.I've tried calibrating, but it fails every time.After checking the error log after calibration I am getting these messages:Code:Excessive probe gain errorCh 1 Probe gain of 1.997e-1Very curious, as it should be a 10x probe. I tried with 50ohm termination on and off (should be on), and after attempting the calibration the scope turns off the termination and won't allow me to turn it back on until I remove and reconnect the probe.I also found a thread with a similar problem but with no resolution posted:(https://www.eevblog.com/forum/testgear/tektronix-p6245-active-probe-issues-with-config-data/)Any ideas?Thanks in advance!

author: strong-inversion
author_rank: Newbie
timestamp: February 11, 2022, 08:29:52 pm
content: Some more thoughts.It seems all the scope is doing is reading off a "probe id" off the eeprom when it is plugged in.Now as to what information is encoded and how might be interesting.I assume they would include:* Some globally unique identifier (serial no?) for compensation data reuse* The capabilities of the probe (attenuation, scope termination settings) or a model number so the scope can look up this information in a lookup table.The latter seems unlikely because it would break compatibility of new probes without a firmware update.later, I'm going to have a go at pulling the data off that eeprom and see if I can make sense of anything (maybe it's just dead lol)

author: strong-inversion
author_rank: Newbie
timestamp: February 12, 2022, 05:30:17 pm
content: Link to a related thread for posterity:https://www.eevblog.com/forum/testgear/tektronix-p6245-active-probe-issues-with-config-data/new/#new
Tek 577 curve tracer and low-current looping - Page 1
Forum section: electronics / testgear

author: precaud
author_rank: Frequent Contributor
timestamp: February 12, 2022, 06:10:47 pm
content: I just recently put a long-dormant Tektronix 577 curve tracer back into service, got a transistor test fixture for not-too-silly money, and am getting to know the unit. Definitely more flexible than the 7CT1N. But worse in one respect.When sweeping low-current beta, looping is much worse. See attached pics of 577 and 7CT1N measuring the same 2N3904 at 1uA/step Ib, 200uA/div and 2V/div display. (This is, perhaps not coincidentally, the lowest current range on the 7CT1N). Numerous NPN's were tested, with the same result.Adjusting the 177 "looping compensation" had no affect on the trace.I don't see any adjustment in the cal procedure to normalize it.I do, however, see several entries in the op manual warning "When measuring beta at lower currents, DC mode is necessary toprevent looping."Would like to hear from other 577 users, is this normal behavior in AC mode? I expected it would be better; 1uA/step isn't terribly low.
SW repository for discontinued scopes - Page 1
Forum section: electronics / testgear

author: Rosomak
author_rank: Newbie
timestamp: February 12, 2022, 06:03:26 am
content: Would someone have an idea on how to locate discontinued scope software, which is not available from the manufacturer anymore?For example an obsolete Agilent DSO80000 still has some umph in it, but the HDMI compliance package SetupInfHDMIHEAC0104.exe is not available anymore. Versions newer than 1.04 would not work Agilent DSO80000 series scope.I can contribute to such repository, if you think that it is a good and helpful idea.
RTA4004 why no Spectrum Analysis in North America? - Page 1
Forum section: electronics / testgear

author: jayk
author_rank: Regular Contributor
timestamp: February 11, 2022, 05:17:10 pm
content: Anyone know why R&S excludes this for units sold in NA?

author: Fred27
author_rank: Unknown
timestamp: February 11, 2022, 05:38:02 pm
content: There was a smimilar restriction for the RTM3000 (option K18?) which I heard was down to a patent issue. That was later resolved with a different option K37 which I asume was re-written to avoid the patent. Maybe it's something similar for the RTA4004.
Software for cheap old USB oscilloscope/Signal/PWM Generator/logic analyzer - Page 1
Forum section: electronics / testgear

author: okw
author_rank: Frequent Contributor
timestamp: January 15, 2022, 03:07:06 am
content: I just found my old USB oscilloscope + Signal / PWM Generator + logic analyzer. It's based on PIC18F24J50.It's crap, but quite handy to put in the pocket for easy tasks.But I've lost the software. I found this page, but the guy doesn't answer his email.https://isp51.blogspot.com/2009/12/usb-multi-programmer.htmlWould anyone have the driver and software for it?

author: scopeman
author_rank: Frequent Contributor
timestamp: February 11, 2022, 03:27:06 am
content: Trysigrok.org

author: ledtester
author_rank: Super Contributor
timestamp: February 11, 2022, 03:47:14 am
content: I realize it would be nice to find the original PC software for you device.It is possible these days, however, to create a very inexpensive and featureful alternative. Have a look at this:https://www.cnx-software.com/2020/11/14/turn-1-5-blue-pill-stm32-board-into-a-sigrok-compatible-logic-analyzer/and the README for the github repository:https://github.com/thanks4opensource/buck50
Reply: Juntek JDS6600 Question Answer - Page 1
Forum section: electronics / testgear

author: Kang le
author_rank: Newbie
timestamp: August 13, 2020, 04:07:14 am
content: Hello everyone,this is Hangzhou Juntao Instrument Co. , Ltd. .I will give you answers to any questions you have about the JDS6600I will give you the best regardsjuntek

author: Kang le
author_rank: Newbie
timestamp: August 14, 2020, 01:16:49 am
content: If you want to know or if you have any questions that I need to answer, you can also contact my email: juntek.xw@gmail.com

author: Mariocar
author_rank: Newbie
timestamp: December 10, 2020, 02:37:43 am
content: Good night. Would you know where I can get the jds6600 wiring diagram? My device is showing white dysplay, and I would like to try to repair it. Thanks in advance for your help.

author: jdev99
author_rank: Regular Contributor
timestamp: February 11, 2022, 08:14:39 am
content: I also would like to know if you can provide a circuit diagram.Mine are having issues after 20seconds, when the 1.2V regulator starts to heat up.
Can SDS1104X-E be unlocked to 200MHz - Page 1
Forum section: electronics / testgear

author: Dashy81
author_rank: Newbie
timestamp: February 07, 2022, 06:03:59 pm
content: Hi All,I'm revolving around SDS1104X-E 4 channel osc. I considered Rigol 4 channel 50 MHz which can be unlocked to 100 MHz. But SDS1104X-E seems more promising to me in case it can be unlocked to 200 MHz BW.My selection is easy.... if it can be unlocked reliably as Rigol then I'd go with this, for sheer extra BW may come handy when I need.May I call upon experienced techies here to my rescue

author: tautech
author_rank: Super Contributor
timestamp: February 07, 2022, 11:29:49 pm
content: Welcome to the forum.Yes, the SDS1*04X-E range is a 200 MHz design running dual 1 GSa/s ADC's to provide 500 MSa/s with all channels active so to meet Nyquist.Have a read of this thread where later on at reply 158 lists a python script that generates BW and option keys.https://www.eevblog.com/forum/testgear/unlocking-siglent-sds1104x-e-step-by-step/The python scripts have proven to be simpler and less risky than diving into the Linux OS to find keys.

author: pope
author_rank: Frequent Contributor
timestamp: February 08, 2022, 09:13:25 am
content: Quote from: tautech on February 07, 2022, 11:29:49 pmWhat do you mean by"less risky"? What are the risks of trying to unlock the scope?

author: tautech
author_rank: Super Contributor
timestamp: February 08, 2022, 09:21:19 am
content: Quote from: pope on February 08, 2022, 09:13:25 amIf you are not familiar with Linux there is risk of bricking the scope.The python key generators generate the license keys based on the model and SN# or in some cases the ScopeID and these generated licenses match the official ones you/we might get from Siglent.I've tested official against python generated licenses on a few occasions in curiosity and they always match.

author: Dashy81
author_rank: Newbie
timestamp: February 08, 2022, 10:24:15 pm
content: Thankyou guys !!!!The FW links mentioned in those chats does not seem to be working... Could it be that Siglent stopped providing that...Also, is there a way to come back to original 100MHz state in case Siglent distributes any FW upgrade ?

author: tautech
author_rank: Super Contributor
timestamp: February 08, 2022, 11:00:55 pm
content: Quote from: Dashy81 on February 08, 2022, 10:24:15 pmThere's more homework for you to do....not everything is just handed to you on a plate.QuoteSure, python scripts give the 100 MHz BW code however with Siglent equipment most FW updates are NOT model specific. FW updates are accepted just fine.

author: C.J.S.
author_rank: Contributor
timestamp: February 10, 2022, 08:18:12 pm
content: Quote from: Dashy81 on February 08, 2022, 10:24:15 pmYou don't need to flash Firmware for increasing the bandwidth. As tautech said, it is easier and safer to run a python script to generate unlock keys.https://www.eevblog.com/forum/testgear/unlocking-siglent-sds1104x-e-step-by-step/msg3592646/#msg3592646https://www.makermatrix.com/blog/hacking-the-siglent-1104x-e-oscilloscope/
Anyone have a handle for an HP 546XX series scope - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 10, 2022, 02:08:46 pm
content: Hello,The handle for my HP 54645D scope just exploded. Does anyone have one for sale? None on Keysight's parts site (no surprises there).SamW3OHM

author: gslick
author_rank: Frequent Contributor
timestamp: February 10, 2022, 05:36:39 pm
content: These have been listed on eBay for a while. 7 still available:Agilent 54622D Handle. Part Number 54622-44801. New In Boxhttps://www.ebay.com/itm/224471995242$20 + shipping

author: Stray Electron
author_rank: Super Contributor
timestamp: February 11, 2022, 12:40:50 am
content: Have you checked with HP? About five years ago I bought a handle from them for one of my meters and it was stupid cheap IMO. I think it cost me $17 and they shipped it via Fed-Ex overnight at no charge!

author: alm
author_rank: Super Contributor
timestamp: February 11, 2022, 01:23:32 am
content: Quote from: Stray Electron on February 11, 2022, 12:40:50 amHP? Or Keysight? Also, from what I've read on this forum, service to individual consumers has gotten much worse, so while it might not hurt to ask, I wouldn't count on Keysight being very helpful even if the handle is still a product they stock.

author: scopeman
author_rank: Frequent Contributor
timestamp: February 11, 2022, 02:14:00 am
content: Thanks Guys!
Looking for HP3311A function generator service manual - Page 1
Forum section: electronics / testgear

author: Lacibácsi
author_rank: Contributor
timestamp: February 08, 2022, 06:28:06 am
content: Hi all !My (rather old and) much loved HP3311A function generator won't work any more. I would like to rescue it. I bought it used many-many years ago and it came without any manual.I am looking for the service manual, The version which could be found on the web has the last 8 pages with unreadable voltage values and part numbers. Scanning resolution was obviously not high enough.I would really much appreciate, if anybody could point me to a usable download link or send me directly those pages.Thank you !

author: alm
author_rank: Super Contributor
timestamp: February 08, 2022, 02:16:55 pm
content: Artek Manuals sells a scan:http://artekmanuals.com/manuals/hp-manuals/. Their scans have always been good quality for me, and if there were any issues Dave was always quick to respond and fix it.

author: nfmax
author_rank: Super Contributor
timestamp: February 08, 2022, 02:38:32 pm
content: I have a paper copy here - which exact page numbers do you need scans of?

author: Lacibácsi
author_rank: Contributor
timestamp: February 08, 2022, 04:46:22 pm
content: Hello nfmax !3x troubleshooting graphs:7-3/7-47-5/7-67-7/7-8Figure 7-4 functional circuit diagram.Then comes the page with oscillograms of the testpoints.Circuit diagram on 7-11/7-12This would be the most important, because it is quite unreadable in the PDF which is circulating on the web.You will find my email-address on my profile-page.Thanks a lot !

author: bdunham7
author_rank: Super Contributor
timestamp: February 08, 2022, 04:50:08 pm
content: Manual still available from HPAK!https://www.keysight.com/gb/en/assets/9018-05938/user-manuals/9018-05938.pdf?success=trueI'd suggest you download it.

author: nfmax
author_rank: Super Contributor
timestamp: February 08, 2022, 05:21:13 pm
content: Best I can manage, I'm afraid - the printing on the paper isn't perfect everywhere. I hope it's good enough!

author: Lacibácsi
author_rank: Contributor
timestamp: February 09, 2022, 07:23:39 am
content: That is perfect for me, thank You very much indeed !
Clare Y160 - Flash Tester Fault Simulator - Page 1
Forum section: electronics / testgear

author: mendip_discovery
author_rank: Super Contributor
timestamp: February 08, 2022, 08:05:44 pm
content: It is amazing what can be sold for ~£150 for regular checks/tests for Test Gear. The following is just some basic teardown and info of a Seaward/Clare Y160 Fault Test SimulatorA customer had this wonderful example and I couldn't resist taking it apart. As you can see someone at some point left the Earth Bond test on a little long, but that is expected.From what I can tell there is 2 x 800 kΩ 5% Resistors connected between Earth and Neutral. With another 0.1 Ω between an external bolt head and Earth for testing Earth Bond Resistance.I must admit I am tempted to make one myself and test it on the next flash test I see just to see how good I can make one, plus if its any good I can make a few for customers. Some 80/20 Nickel Resistance wire should do the trick.
Meguro MSG-2050A - Page 1
Forum section: electronics / testgear

author: ua4yhz
author_rank: Regular Contributor
timestamp: February 11, 2022, 11:40:43 am
content: Hi everybody.I bought this device on Ebay, but without software. If anyone has software for this device, please share.To control the device via a computer, I applied to the manufacturer for software, but they politely refused me.I wrote a small program that works via the RS-232 port, via a homemade RS-232 to GPIB adapter, GPIB adapter and USB port.
Need Manual / Hi-Res Schematic For DLVP-50-300-3000A Dynaload - Page 1
Forum section: electronics / testgear

author: The Doktor
author_rank: Regular Contributor
timestamp: February 08, 2022, 08:19:50 am
content: I've just purchased a Transistor Devices Inc. (TDI) DLVP-50-300-3000A Dynaload. It arrived with shipping damage, hasn't made it to my test bench. It may even be in working condition, but I still like to have service data on all my toys.I've downloaded a few manuals for it, but schematics are all either missing or shit quality. I would like to find an "Artek quality" schematic if possible. I did get an original manual for a DLP 50-150-3000A, but there are some major differences in the control circuits.Suggestions?
Set external trigger on a Siglent 1204XE - Page 1
Forum section: electronics / testgear

author: n4idaham
author_rank: Newbie
timestamp: February 08, 2022, 01:08:55 am
content: I've been successful at setting up external trigger on channel 2 of the scope to look at data on channel 1.However it seems I have to also have channel 2 active and displayed also before the trigger works.Is this the way it is for this scope, or can I kill channel 2 display and still have it trigger the sweep?Al Harper

author: tautech
author_rank: Super Contributor
timestamp: February 08, 2022, 02:23:37 am
content: Quote from: n4idaham on February 08, 2022, 01:08:55 amHi AlUsing an external trigger for Ch1 is best used on channel 3 or 4 so to retain max sampling and memory depth.On P2 of any of the channel menus is an option to hide the channel when display of it is not required and doing so will show a little H in the channel tab.
Where to find Brymen BM869s and  BM079 in Canada? - Page 1
Forum section: electronics / testgear

author: applepro
author_rank: Newbie
timestamp: February 08, 2022, 12:29:59 am
content: Hi,Anyone know where I can get a Where to find Brymen BM869s and BM079 in Canada?I don’t care if is a rebranded one.

author: J-R
author_rank: Super Contributor
timestamp: February 08, 2022, 01:02:17 am
content: Mail order OK?Welectron has them, plus some other goodies:https://www.welectron.com/Brymen-BM869s-Multimeter_1https://www.welectron.com/Brymen-BMP-86x-Carrying-Pouchhttps://www.welectron.com/Brymen-BAC3-Snap-On-Alligator-Clipshttps://www.welectron.com/Brymen-BMH-01-Magnetic-Hangerhttps://www.welectron.com/Brymen-BKP60-Type-K-Temperature-Probehttps://www.welectron.com/Brymen-BU-86X-USB-Interfacehttps://www.welectron.com/Brymen-BM079-Current-Clamp-Multimeter

author: applepro
author_rank: Newbie
timestamp: February 08, 2022, 01:08:58 am
content: Yes but they are in Germany.I think the only way to get a Bryman Multimeter in North America is to import on form Europe.

author: bdunham7
author_rank: Super Contributor
timestamp: February 08, 2022, 01:09:09 am
content: They're remarketed by Greenlee. They probably cost more, but Greenlee offers a lifetime warranty on some products, at least in the US.The models are the DM-860A and I believe the current clamp would be the CMI-600. Here's a catalog from Graybar, but you can search locally for Greenlee dealer.https://www.graybarcanada.com/ASSETS/DOCUMENTS/CMS/EN/Vendors/Greenlee/2019_Greenlee_Catalog_LR.pdf
Tek 335 or Telequipment D34 CRT 154-0726-05 CRT Needed (or dead scope) - Page 1
Forum section: electronics / testgear

author: scopeman
author_rank: Frequent Contributor
timestamp: February 07, 2022, 09:36:03 pm
content: I am looking for a Tek 154-0626-05 CRT used in either a Sony/Tek 335 or a Telequipment D34would also entertain a dead scope if complete with a CRT.I am repairing a dead D34 for a Ham friend.Thanks,SamW3OHM
Firmware for Rohde & Schwarz FSE(A,B,M)  DOS version with  BIOS 3.1 - Page 1
Forum section: electronics / testgear

author: hafrse
author_rank: Regular Contributor
timestamp: February 08, 2022, 03:26:01 pm
content: Hello,My hard drive went bad on my FSEM and now I am looking for a HDD image for DOS version (not windows) with BIOS 3.1 , many thanks in advance!George
[HELP] SM-4TPZ-144 - C Mount driving me nuts. - Page 1
Forum section: electronics / testgear

author: datadrug
author_rank: Newbie
timestamp: February 08, 2021, 11:51:34 am
content: Hello guys,First time posting, long time reading this forum.So, I bought a SM-4TPZ-144 and i'm really happy with it. I bought a C Mount (https://www.amazon.de/-/en/gp/product/B07MZ56JSR/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1) that fits perfectly, however it's a 0.5X and the diference between the eyepieces and what I see in the monitor is really big, so that's a no go.I was browsing online and i found a SZMCTV 1/2 C-mount lens that should do what I need, and I also bought it... However it doesn't fit in any way possible.Disclaimer, I'm new to this C-Mount lens stuff, so perhaps i'm being idiot and the solution is simple, but I can't work it out.Attached are the images of the 3 ways I could "mount" this on the scope, but all are either too loose or to tight.Any help will warm my heart.Thank's in advance!

author: datadrug
author_rank: Newbie
timestamp: February 08, 2021, 02:52:31 pm
content: If you guys can't figure it out, I would also like to know what setups do you use for scope eyepieces + trinocular port.

author: datadrug
author_rank: Newbie
timestamp: February 09, 2021, 09:39:42 am
content: Update to anyone interested.Despite any information about this, Amscope does have 2 types of trinocular tubes.I happen to have the worst type.As such I 3d printed a adapter for the lense and all is good.

author: arekm
author_rank: Unknown
timestamp: February 08, 2022, 02:58:00 pm
content: I have this type of "port" in microscope but mine SZMCTV 1/2 adapter has different end."A" side goes into microscope, "B" into camera (HAYEAR HY-1136 -http://www.hayear.com/wap/product/?12_166)Turns out that end can be unscrewed and that "it" is a microscope "port" -> 28mm adapter (NOT c-mount which is 25.4mm). Just found this adapter on aliexpress Huaxin Tool Store with name "28 to 38 ring A".Unfortunately I see much less in camera than in eyepieces (and my setup is 0.5X WD165 barlow lens and WF10X/20 eyepieces), so I consider this setup very bad one.Don't know how to get the same field view in camera, especially that I want to use lumix GX80 instead of this hayear as camera.Using lumix needs some different adapter (still figuring out what one). I've tried to use the same adapter (from photo) but I only see round circle of light in middle, so it's clearly wrong type.
TEK DM501 multimeter - Page 1
Forum section: electronics / testgear

author: frantisek
author_rank: Regular Contributor
timestamp: December 12, 2021, 03:16:36 pm
content: Please help with DM501 repair. It worked normally about 2 years ago. It will now display a random number and a decimal point when turned on. The display does not respond, only the decimal point switches when changing ranges.The display shows, for example, -1.0480 when -1 is constantly lit and the decimal point with the rest flashes. I don't have pulses on transformer T300, anode CR310. Pin 9 U310B has a correct 5Hz rectangle, but it no longer passes through the C310. The transformer, diode and capacitor are OK.I would insert the diagram, but I don't know how. Thank you very much in advance for any help!

author: frantisek
author_rank: Regular Contributor
timestamp: December 18, 2021, 09:23:18 am
content: So the multimeter is repaired. Thank you to everyone who was willing to help ....

author: alm
author_rank: Super Contributor
timestamp: December 18, 2021, 11:15:10 am
content: Could you post how you repaired it, so you can at least help future people having the same problem?

author: David Hess
author_rank: Super Contributor
timestamp: December 18, 2021, 01:12:40 pm
content: When I repaired my DM502, it had a shorted tantalum capacitor.

author: THDplusN_bad
author_rank: Regular Contributor
timestamp: December 19, 2021, 05:03:06 pm
content: Good Day,a friendly hint: For expert advice and tips for your next repair of Tektronix T&M equipment, you may also want to joinhttps://groups.io/g/TektronixCheers,THDplusN_bad

author: frantisek
author_rank: Regular Contributor
timestamp: January 09, 2022, 11:45:12 am
content: KO Q245.

author: David Hess
author_rank: Super Contributor
timestamp: January 10, 2022, 02:29:27 am
content: That is an odd one to fail. The others of the same type might be marginal from old age.

author: JacobPilsen
author_rank: Regular Contributor
timestamp: January 11, 2022, 07:57:46 pm
content: What about NiCd battery ?Changed ?

author: frantisek
author_rank: Regular Contributor
timestamp: January 12, 2022, 06:28:51 pm
content: Still to find faults. I highly recommend the digital oscilloscope! I never saw very narrow needle pulses on the analog ...

author: frantisek
author_rank: Regular Contributor
timestamp: January 12, 2022, 06:31:21 pm
content: Where would the battery come from?

author: JacobPilsen
author_rank: Regular Contributor
timestamp: February 06, 2022, 07:10:49 pm
content: Ordinary shop, maybe ges.czI did not use the exact same battery size.Only the same voltage, ie the number of cells.(It was just better than a completely dead battery.)
Hantek DSO1200 won't  boot (NOR flash dump) - Page 1
Forum section: electronics / testgear

author: kosomsk
author_rank: Regular Contributor
timestamp: February 07, 2022, 09:30:24 am
content: Hi allTrying to find U13 ic's dump. My device stuck on boot screen after update, and now he's bricked. All ics scratched, exclude U13 (39VF3201). Board marking DSO1200 Rev.1.06. Who can help with dump for this oscilloscope :broke ?
How to read from HP5316B via GPIB? - Page 1
Forum section: electronics / testgear

author: gossamer
author_rank: Contributor
timestamp: February 05, 2022, 08:54:20 am
content: I connected this freq counter to the gpib and Im using labview to communicate with it. I was able to send few commands and something is happening on the screen, but there doesn’t seem to be a command for reading the current value. Also, counter gets stuck into some limbo mode when toggling between FN0-FNx commands. RE command sometimes resets the counter, but sometimes just doesn’t do anything…User manual gives example for the basic like commands, but I dont know how that works over VISA..Did anyone had any success with reading this counter via VISA drivers?
RIGOL DSA815 or SIGLENT SSA3021X Plus - Page 1
Forum section: electronics / testgear

author: Crambone
author_rank: Frequent Contributor
timestamp: February 04, 2022, 01:07:53 am
content: I’m interested in the following 2 analyzer with Tracking Gen. I was wondering about the experimental hacks available for each one. Not that anyone would do it but just interested if it’s available to do and how to do it? 😜

author: tautech
author_rank: Super Contributor
timestamp: February 04, 2022, 08:42:59 am
content: In the SSA3kX and X+ thread there is plenty of info along with the SSA hack thread.SSA3021X+ has the advantage of being able to be enhanced to SVA1032X with all the capability of SSA models and a single port VNA.It’s been a very popular hack.
Agilent 53131A "Frequency Counter" Made in Korea - is it legit? - Page 1
Forum section: electronics / testgear

author: mightyohm
author_rank: Regular Contributor
timestamp: February 03, 2022, 11:14:24 pm
content: I recently purchased an Agilent 53131A universal counter.Immediately noticed a couple quirks:Rear panel says Made in Korea - I wasn't aware that Agilent had a factory in Korea.Front panel says "Frequency Counter" instead of Universal Counter.Any reason to believe this unit is not genuine?Also, does anyone know if the OCXO's are generally swappable between the older HP 53131A's and the later Agilent units?

author: Someone
author_rank: Super Contributor
timestamp: February 03, 2022, 11:59:24 pm
content: Some times T&M gear gets "assembled" domestically in odd countries to meet tender/contract requirements (or for dodging taxes etc). Those products might not even be publicly sold/acknowledged.

author: alm
author_rank: Super Contributor
timestamp: February 04, 2022, 12:13:06 am
content: Quote from: mightyohm on February 03, 2022, 11:14:24 pmI would be very surprised if it wasn't. The interface to an OCXO is usually fairly basic (power supply, oscillator out and frequency control), and I see no reason for them to change the interface within the same model. See if you can find service manuals for both versions and compare the part numbesr. My Agilent-branded assembly-level service manual 53131-90039 lists part numbers 10811-60160 (HS) and 10811-60260 (UHS).

author: WattsThat
author_rank: Frequent Contributor
timestamp: February 04, 2022, 12:30:41 am
content: It’s genuine. HP/A/K had a large facility there, I have several pieces of gear assembled in Korea. IIRC, there was some good history about HP’s expansion in Asia in the great book Bill and Dave.
My DIY Fluke style IR cable won't work with my Tektronix TX3 - Page 1
Forum section: electronics / testgear

author: n3mmr
author_rank: Regular Contributor
timestamp: February 03, 2022, 05:15:13 pm
content: Ir cable here:https://www.eevblog.com/forum/testgear/fluke-187-making-an-ir-cable/.That cable should work with the TX3, shouldn't it?The cable I built works with mirroring the IR in a teaspoon, and the com port setting is 9600, 7bits, 1 stop bit and even parity.I opened up my TX3 and the IR bits look positively skimpy, like two miniatyre sugar lumps about 15 mm from the plastic IR window.How can I check if the IR port of the TX3 works, independently of having a working complete serial cable? Is there some test procedure that lights up the LED or checks what thesensor element sees?And is there some required IR startup procedure or is it supposed to always be ready to answer any commands?BTW, what are those tiny components? A LED and a CDS photoresistor or what?
VICHY VC8145 display - Page 1
Forum section: electronics / testgear

author: downwind27
author_rank: Newbie
timestamp: January 31, 2022, 07:55:33 pm
content: Has anyone found a way to get the backlight to come on automatically when it's powered up? Odd how having to press an extra button becomes tiresome as you get older.

author: BlackFX
author_rank: Contributor
timestamp: February 01, 2022, 01:11:43 am
content: Maybe just short the button?

author: PatRC
author_rank: Newbie
timestamp: February 01, 2022, 11:25:05 am
content: See thishttps://www.eevblog.com/forum/testgear/vc8145-thread-it_s-here-finally/msg694781/#msg694781

author: downwind27
author_rank: Newbie
timestamp: February 03, 2022, 10:53:32 am
content: Thanks PatRc, I'll give the suggested mod a try. I did attempt to hold the button permanently pressed but it did not always work. That was more annoying than having to press the button.
Calibration service within EU / Agilent E7495B Base Station Test Set - Page 1
Forum section: electronics / testgear

author: 9aplus
author_rank: Regular Contributor
timestamp: February 03, 2022, 09:05:36 am
content: Looking for calibration service within EU forAgilentE7495BBase Station Test SetNeed to measure some avionics, but for local NAA results arenot valid if the used instruments are out of calibration period.Have received one offer, only for CW mode - level of 2500 euro,which is prohibitive because calibration is valid for only 2 years...Any recommendation?
Advantest R6551 schematic wanted - Page 1
Forum section: electronics / testgear

author: almarghi
author_rank: Newbie
timestamp: January 18, 2014, 07:37:52 am
content: Hi all!Does anyone have the schematic of the above multimeter?Thanks,Al

author: COSMOS2K
author_rank: Contributor
timestamp: December 23, 2017, 05:09:40 pm
content: Hello:If you still need it, I have the user manual.Merry Christmas

author: BreenBoks
author_rank: Newbie
timestamp: February 02, 2022, 02:28:09 pm
content: Hi all,I bought a used advantest r6551 where the ACV readings are jumping around even when the input is shorted. All caps are already replaced by the look of it and a schematic or a repair manual would really help to get me started repairing this meter. Can anyone help me out?Cheers.
Replacement Rigol scope probe ground clips? - Page 1
Forum section: electronics / testgear

author: ve7xen
author_rank: Super Contributor
timestamp: February 05, 2022, 02:05:59 am
content: After being very confused by what my scope was telling me, I realized one of the ground clips that came with the DS2072 RP3300 probes has gone open. I disassembled the alligator clip and it seems fine, so the open must be in the wire or the moulded pincer end, which is also of course the part that's not as easy to DIY replace. Anyone know where I can find a suitable replacement? I don't really want to shell out for a whole new probe if it can be avoided...
Tek 468 Service Counter IC? - Page 1
Forum section: electronics / testgear

author: Chris56000
author_rank: Frequent Contributor
timestamp: February 01, 2022, 07:58:23 pm
content: Hi!I recently picked up a '468 with acquisition faults and it looks like I'll have to make two new EPROMs and a Service EPROM for it!Can somebody post a sketch or schematic of a 28-24 pin EPROM adapter and the connections to make an adaptor to fit a 74LS590 in the "Test Counter" Socket please?I'm happy to use an SMD 'LS590 and design a suitable adapter for it!Chris Williams
Liumy LM2020 calibration? - Page 1
Forum section: electronics / testgear

author: Dave92F1
author_rank: Contributor
timestamp: February 01, 2022, 05:27:07 pm
content: I just picked up a Liumy LM2020 handheld DMM/1-channel O-scope. For USD $88 at Amazon (shpped!), it doesn't seem bad. It's not a serious oscilloscope, but for simple audio frequency work it looks useful.Anybody know how to calibrate it? Their web page says "software calibration", but it's not mentioned in the manual.https://www.liumytools.com/LIUMYARTISTORE-Oscilloscope-Multimeter-LM2020-New-Update-Professional-LED-Handheld-Oscilloscope-Multimeter-with-2-5-Msps-high-Sampling-Automatic-Waveform-Capture-Function-DC-AC-Voltage-Current-Test-p-28.htmlMine is off about 1.1% on DC (that's within the 1.5% spec, so I'm not really complaining, but closer would be nice).
Help with Testlab LCR-3000A LCR Bridge - Page 1
Forum section: electronics / testgear

author: jaycobie
author_rank: Contributor
timestamp: January 12, 2019, 01:24:07 pm
content: I recently aquired an LCR bridge that I'm hoping someone could educate me on to some degree.It's a Testlab LCR-3000A analog LCR BridgeI've been able to pretty accurately measure both resistance and capacitance on this thing, but I'm not entirely sure of the limits when it comes to large inductors (1-10H or more)My questions are as follows:1) Does anyone happen to have a manual for this thing?2) Can anyone guess as to the function of the Q/Center x 0.1 dials? I assume it's for making the sensitivity more effective but so far I have not seen any proper correlation. For resistance it seems useless and on inductors it seems sensitive but has skewed the results when not set at 0.3) The T and "Ratio" function is somewhat of a mystery to me, but I assume it's for measuring the turns ratio of transformers. How that would be achieved I am not sure, besides maybe connecting the primary to the "X" posts and the secondary to the N2 posts. Any guesses?

author: Gonzini
author_rank: Contributor
timestamp: February 01, 2022, 02:49:40 pm
content: Yeah, here you go!I just found mine and going to sell it so i looked online for a manual.Its seems i had already got it in the archives.

author: jaycobie
author_rank: Contributor
timestamp: February 01, 2022, 05:44:01 pm
content: Wow, thanks a bunch!I've moved on to a cheap digital LCR meter for caps and inductors but having the manual, I'll give it another go-over and see it's capabilities better.

author: AJ3G
author_rank: Regular Contributor
timestamp: February 01, 2022, 07:57:27 pm
content: I think that is a really cool/neat looking meter!
Pfeiffer/Balzers pirani measuring board CP 300 - pinout - Page 1
Forum section: electronics / testgear

author: Drirr
author_rank: Regular Contributor
timestamp: November 04, 2021, 11:44:20 am
content: Hi,Few days ago I received Pfeiffer " PIRANI COLD CATHODE MEASUREMENT BOARD CP 300 " with PC board, display and backplane.https://www.ajvs.com/new/product_info.php?products_id=16115Everything should be functional, I was able to found +5V for logic and ( probably ) +/-12V analog, but still getting incorrect values on Pirani gauge.Does anybody know voltages on backplane board or pinout?Thanks a lotDavid

author: KaneTW
author_rank: Frequent Contributor
timestamp: November 04, 2021, 03:01:23 pm
content: No, and that's why I generally avoid gauges without a builtin converted out.There's a tiny chance Pfeiffer might help you, but I doubt it.Why do you need it?

author: Drirr
author_rank: Regular Contributor
timestamp: February 06, 2022, 05:09:22 pm
content: Hello,I finally found out necessary voltages. So..Opamps need +/-15V ( +/-12V I used is not sufficient )5V for logic18V for Penning vacuum sensor. There is LM317 close to HV 3kV Royer. Right input pin of LM317 is +18VAll voltages are necessary and needs to be cca +/-5%, even if you are using only Pirani sensor.
Hantek DSO2D15 - Page 1
Forum section: electronics / testgear

author: ztoti
author_rank: Newbie
timestamp: February 01, 2022, 06:16:45 am
content: Hi all,I just bought DSO2D15 and update firmware to dso3kb_20220124.upk.Everything is OK ( so far ) just AWG generator has error, when I try to upload the new wave with Wave Editor, even if try to load the wave file with USB, then I get a message "Download Error". On Keysight Connection Expert I see successful connection to USB 0.What I miss ?Thank you.