hybridfree/eevblog-posts huggingface dataset:
GW Instek MFG-2000 Newbie question - Page 1
Forum section: electronics / testgear

author: Agosto
author_rank: Contributor
timestamp: April 18, 2024, 05:33:59 pm
content: I just acquired a used GW Instek MFG-2130 Function Generator. All went well during initial setup until I tried to enter a specific amplitude for a desired sine wave output: When I key in an amplitude of 100mV RMS, I measure at the output 202mV RMS (measured with 3 different meters). When I press the various function keys at the bottom (e.g. "RMS, PP", etc), the amplitude value changes on the display (e.g. 100mV RMS changes to 282mV PP), but the output voltage remains the same. "200mV RMS" on display gives me 410mV RMS at the output.Am I doing something wrong here or is there a problem with the function generator?Thanks for any assistance

author: nctnico
author_rank: Super Contributor
timestamp: April 18, 2024, 05:41:32 pm
content: Read the manual about the load setting. This can typically be set to high-z and 50 Ohm. This setting determines the scaling of the displayed amplitude. You probably have it set to 50 Ohm load while you have a high impedance load attached.

author: KungFuJosh
author_rank: Super Contributor
timestamp: April 18, 2024, 05:44:22 pm
content: Yup, sounds like mismatched load. That will happen trying to connect any AWG to a DMM. You can test on your oscilloscope and see if it makes more sense (still needs to be properly loaded).

author: Agosto
author_rank: Contributor
timestamp: April 18, 2024, 05:49:18 pm
content: Thanks to both of you! Yes, I read the manual but while changing the load parameter I was focusing on the output and not on the generator display. So indeed the displayed value doubles in "High Z" mode.Now: After changing the load to "High Z" generator display shows 300mV rms, output is 308mV rms. Is the accuracy appropriate for a generator in this price range?

author: KungFuJosh
author_rank: Super Contributor
timestamp: April 18, 2024, 06:09:17 pm
content: Quote from: Agosto on April 18, 2024, 05:49:18 pmAccuracy should be stated in the spec sheet. However, is the meter calibrated and in spec also? If you only test with one piece, it's hard to know which one is telling the truth.

author: Agosto
author_rank: Contributor
timestamp: April 18, 2024, 06:13:32 pm
content: Agreed. I tested with 3 different meters, analog and digital (including scope). Could not find the accuracy in the specs, will check again. Thanks

author: Agosto
author_rank: Contributor
timestamp: April 18, 2024, 07:22:43 pm
content: 2% accuracy according to spec. I guess that is ok....Thanks again for your feedback
Anritsu MS462X / Scorpion Noise Figure measurement - Page 1
Forum section: electronics / testgear

author: alan.bain
author_rank: Regular Contributor
timestamp: April 13, 2024, 10:49:17 am
content: I've been trying to make some NF measurements with an Anritsu MS4622 "scorpion" which says that it has the 6GHz NF Option on the HW options screen, but every time I try and measure I get a Noise Figure overload error. There also seems to be a distinct lack of 28V out of the back port for the HP346B.I'm wondering if the software is present but some hardware element is not present, although I would have thought the firmware would have detected that.Photo shows the front of the RF board. I'm wondering if there should be some other modules behind the input modules marked 46720.Alan

author: DaJMasta
author_rank: Super Contributor
timestamp: April 13, 2024, 06:39:37 pm
content: You want to confirm what hardware you actually have, the 4622 is a 3GHz unit, the 4623 is the 6Ghz version. I wonder if the CPU board in your unit is from another unit or if some of the stored data has been configured for a different model. There also should be the 28V BNC on the back for the power supply.

author: alan.bain
author_rank: Regular Contributor
timestamp: April 14, 2024, 10:30:57 pm
content: There is indeed a socket on the rear for the 28V supply to the noise source. It is the 3GHz variant (4622) but the BBRAM snaphat has had to be replaced. I remember this being a painful process, but the screenshot from before I did this shows the Noise Figure option present.

author: RFMWdude
author_rank: Contributor
timestamp: April 17, 2024, 09:16:02 pm
content: Noise Figure Measurement requires option 4. This should be mentioned on the rear panel.The A2 Option Module is required for this:You can set some DIP switches on the CPU board to configure the options (and make the software believe NF Measurements are possible). But without the A2 Option Module present, this obviously doesn't work as expected.

author: alan.bain
author_rank: Regular Contributor
timestamp: April 18, 2024, 07:12:28 pm
content: Thank you very much RFMWDude that photo makes it clear. There is no A2 option module. Now that I look at the schematics I see that the noise figure receiver is on this board and as suspected the DIP switches are set incorrectly. Actually rather makes sense since this is a 3GHz VNA and the options available listed 6GHz NF measurement which should have seemed incongrous. I will re-set the DIP switches and look for a NF meter!
The Fluke 8810 - Any information? - Page 1
Forum section: electronics / testgear

author: djhack
author_rank: Newbie
timestamp: April 02, 2016, 04:47:10 pm
content: I have acquired a Fluke 8810. It has the AC and the Ohms options. At first the display was erratic, there was a faint hum, and there was a clicking noise on some of the functions. This turned out to be a bad capacitor in the -35 volts section. Having fixed that The AC and the DC functions seem normal. However the Ohms function seems to settle on flashing what the manual describes as an overload display -18.8888 or something like that. I suspect that the Ohms board itself has an issue. There is what appears a little LED on the board that does not light up. I think the board is not getting power.However there is precious little information on the board itself. Which lead is the power lead and what should be the expected voltage? Does anyone know anything about this "ohms conversion assembly"? Does anyone have one laying around? I might buy another meter for parts, but before I do, as any tech would, I want to find and fix what is wrong.DJ...

author: wingnut7091
author_rank: Newbie
timestamp: August 28, 2016, 03:32:44 pm
content: Did you find that there is a manual available online as a PDF?Failing that, I have many of these and can assist you, let me know on this forum.

author: peterkos2
author_rank: Contributor
timestamp: March 16, 2024, 07:22:27 am
content: Good day. I got my hands on this Fluke 8810a multimeter. It looks like it can measure, but the numbers on the display alternate. For example, when measuring DC voltage, it fluctuates by 1-2 volts. After disassembly, I found that the voltage fluctuates on the test points. Can you advise me where to look for the error? Thanks for the answers

author: GigaJoe
author_rank: Frequent Contributor
timestamp: March 17, 2024, 02:32:01 am
content: usually , psu filter caps to replace

author: peterkos2
author_rank: Contributor
timestamp: April 17, 2024, 04:07:34 am
content: Quote from: GigaJoe on March 17, 2024, 02:32:01 amThose are fine
RIGOL launches official second-hand store - Page 1
Forum section: electronics / testgear

author: Wong
author_rank: Newbie
timestamp: April 14, 2024, 07:55:02 am
content: RIGOL launches official second-hand store.https://mall.rigol.com/gallery.html?n=%E4%BA%8C%E6%89%8B

author: ebourg
author_rank: Contributor
timestamp: April 15, 2024, 09:56:35 am
content: A used DHO804 at 260€, that looks interesting.https://mall.rigol.com/item.html?item_id=1577But I guess that's for China only.
Siglent 1104X-E -- Custom Screensaver? - Page 1
Forum section: electronics / testgear

author: jaystraw
author_rank: Newbie
timestamp: April 15, 2024, 08:20:58 am
content: Hi all!First post, though I used this forum to decide on my 1104 -- I absolutely love it. The last scope I had I left in Australia when I moved back to the US in 2012. It was a small CRT model, and I've been enjoying -- or when frustrated, telling myself I'm enjoying -- wrapping my head around how these new DSOs work.I've seen some neat stuff with customizing the boot screen, but I was wondering if anyone's tried or heard of a way to customize the screensaver?I searched "siglent screensaver" and found nothing about customizing it. I still read a bunch of posts hoping to catch something. But all I caught was the feeling that no one likes it. Maybe it was from that guy who posted, "maybe you should update your firmware to get rid of the screensaver, no one knows why it's there in the first place"Thanks everyone for everything. And since it's my first post, lemme know if I'm in the wrong place etc.Be well! - Jay

author: tautech
author_rank: Super Contributor
timestamp: April 15, 2024, 08:24:15 am
content: Welcome to the forum.Best use of a screensaver is set to OFF !
UT60S change to current measurement without touching the button - Page 1
Forum section: electronics / testgear

author: ndarjo21
author_rank: Regular Contributor
timestamp: January 29, 2024, 07:18:05 pm
content: This 6 month multimeter have strange behavior. It change to current measurement mode itself. When teardown the meter i didnt see any damage. After covering trace below current mode button with a isolation tape(black tape) i havent encounter this problem again.https://youtube.com/shorts/6ggqvz2dYH4?si=97CbYRASmro-hcVv

author: ndarjo21
author_rank: Regular Contributor
timestamp: April 13, 2024, 05:20:23 pm
content: it happen again. even the tape still in the place. other mode button didnt repsond. just backligh/power, hold, range, hz/% which give respond

author: coromonadalix
author_rank: Super Contributor
timestamp: April 13, 2024, 05:21:49 pm
content: keypad contaminants ??

author: sonpul
author_rank: Regular Contributor
timestamp: April 13, 2024, 09:21:16 pm
content: UT60S has detection of correct probe connection. Perhaps the two separated halves of the uA connector are shorting each other. When they close, they command the multimeter to turn on the current measurement mode.The contact plates themselves can short out, or something metal could get in there.

author: ndarjo21
author_rank: Regular Contributor
timestamp: April 14, 2024, 01:53:25 am
content: i dont have another multimeter so didnt know how to diagnose it. but the pcb seems clean. i already resolder allmost all component with new solder in case there are bad connection but the problem still persist

author: ndarjo21
author_rank: Regular Contributor
timestamp: April 14, 2024, 05:27:26 am
content: after removing the transistor/mosfet/anything. now it work in V, mV and resistance mode. the problem when measuring voltage is 500mV floating in V mode

author: ndarjo21
author_rank: Regular Contributor
timestamp: April 14, 2024, 10:03:44 am
content: shorted probe in resistance or continuity show 600 ohm. in diode mode 0.1v
Rigol DHO 4400 - Page 1
Forum section: electronics / testgear

author: dan_d_engineer
author_rank: Newbie
timestamp: April 16, 2024, 10:42:54 am
content: Hi every one.Since the DHO 4000 series operates on Android, it is plausible that a WiFi dongle could be used to connect to a network.Any ideas on how to proceed?Thank you all.

author: Pinkus
author_rank: Frequent Contributor
timestamp: April 16, 2024, 11:04:58 am
content: Check the DH0800 thread. I remember, they made it possible to have access to Android and they installed a driver for an USB Wifi dongle.

author: ebastler
author_rank: Super Contributor
timestamp: April 16, 2024, 05:34:01 pm
content: It's quite likely that this also works for the DHO4000 -- my DHO1000 certainly behaved the same.A driver is pre-installed for one specific type of WiFi chip. The TP Link TL-WN725N is the USB dongle of choice. The WiFi network parameters are entered via the regular Android configuration UI, which is available by connecting a USB keyboard (before booting the scope) and pressing Windows-N. Remaining network setup via the scope's UI, as for wired LAN.Here's a nice video walk-through:https://youtu.be/ECc2BdJzZfs
Need pinouts for two Wenzel oscillators - Page 1
Forum section: electronics / testgear

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: January 09, 2024, 05:59:12 pm
content: Hi,I have a Wenzel 500-0854 and a Wenzel 500-01366. Does anyone have pin outs for these units?The 500-01366 is also marked Wiltron 630-30 so it's probably removed from a piece of Wiltron gear.Cheers,Corby

author: KE5FX
author_rank: Super Contributor
timestamp: January 10, 2024, 12:30:42 am
content: If you have a couple of photos, let's see those -- there are only so many classes of OCXOs in their catalog and they tend to share pinouts.

author: edpalmer42
author_rank: Super Contributor
timestamp: January 10, 2024, 01:43:56 am
content: On the Wenzel website (quanticwenzel.com), you can browse the list and match the size and pinout 'style' (e.g. sma + 6 pins) to your unit. Then download the pdf for that unit. As KE5FX states, there aren't that many possibilities.Of course, since you've got 500 series units, they could have scrambled the pinouts to match the customers request.

author: 5065AGuru
author_rank: Frequent Contributor
timestamp: January 10, 2024, 03:50:32 am
content: Here are PIX of the two units

author: KE5FX
author_rank: Super Contributor
timestamp: January 10, 2024, 05:37:44 am
content: Not sure on the -01366 but the -0854 looks to be a Timekeeper or similar part. Seepinout in .PDF(but no guarantees that it's right, of course.)If it's a 24V part, the pinout may be somewhat different. I've seen those but don't have any documentation on hand for them.

author: Damperhead
author_rank: Contributor
timestamp: April 13, 2024, 08:36:39 pm
content: Wenzel 500-22969 ended up on my desk. No idea of origin. Where can I find the Datasheet or information in general for this?
HP 8642A Signal Generator Output Clipping - Page 1
Forum section: electronics / testgear

author: sfoster
author_rank: Newbie
timestamp: April 13, 2024, 03:13:32 pm
content: I just picked up an HP 8642A. The fan wasn't working so I replaced it. I see clipping on the top of the output at lower frequencies and it increases with amplitude. By 5000Hz it's good. Perhaps a thermal issue happened before the fan was replaced. Any thoughts on this issue are appreciated. I work on vintage receivers so picked this up for tuner alignment (overkill!) and the inside is a bit daunting. Output picture on my scope is attached.-Thanks
Evaluating Noise on Tektronix TCA Differential Probes - Page 1
Forum section: electronics / testgear

author: calibrationfixture
author_rank: Regular Contributor
timestamp: April 01, 2024, 07:20:52 am
content: Hi to All,Some time ago I acquired a few Tektronix TCA Differential Probes. They all pass the Standard Tests, but the only two P7380 Probes show intriging noise results.One of them has a little DC-Offset with open inputs, The other not. When shorted to ground both Probes have no DC-Offset. On both I observed with 5x Attenuation and highest TDS7404B Sensitivity (thus 10 mV/Div on Scope) a little drifting Noise-Baseline (Burst/Pop-Corn Noise?) in comparison with the other Differential Probes (P7330 and P7380SMA). Is that normal for P7380 Probes? Even more strange on one of the P7380 Probes (with signs of repair!) there is no difference between Noise Measurement Values (Vpp and RMS) with open or shorted inputs. Anybody with some clues on this?Calibrationfixture

author: KrudyZ
author_rank: Frequent Contributor
timestamp: April 02, 2024, 03:21:49 am
content: Count yourself lucky if that is the only problem you have with a 8 GHz diff probe.These probes are not very robust.I have a couple where one input is blown.They are also basically not repairable.

author: David Hess
author_rank: Super Contributor
timestamp: April 02, 2024, 07:07:28 am
content: Quote from: calibrationfixture on April 01, 2024, 07:20:52 amOffset when open is caused by excessive leakage, which is usually from overload damage or ESD. If the leakage is across a PN junction, then it produces the same current noise as input bias current does.

author: calibrationfixture
author_rank: Regular Contributor
timestamp: April 13, 2024, 07:35:31 am
content: Hi David,Thank you for your reply. Reading the User Manuals of these Probes and how they are configured (Service Manuals) there seems no problem (= damage) when there is a little (steady nature, thus not drifting) DC-Offset on highest Sensitivities in case of open inputs.Calibrationfixture
TDS724A Maximum Spec? - Page 1
Forum section: electronics / testgear

author: nicnac117
author_rank: Contributor
timestamp: April 11, 2024, 10:31:59 pm
content: I have searched here but to no avail for a n answer to the question . What is the max spec you can hack the 724A to . I know about the hack/upgrade that can be done on the 744..to 784 , but would i be right in thinking 500mehgs is as far as the 724 goes ?. Please advise if its known that the 724A can go to 1 gig .

author: TERRA Operative
author_rank: Super Contributor
timestamp: April 12, 2024, 12:45:56 am
content: The TDS782A is 1GHz 2-channel TDS700 series scope, so it is possible you may be able to do the hack to your TDS724A to get the extra bandwidth. I have never tried to verify this (Maybe I have a TDS724 in my collection, but I can't remember...)Unfortunately I've never had a TDS782 scope on my bench so I don't know the pattern of resistors needed, but it wouldn't be hard to test, only 16 combinations!You'll need to play with R1061, R1062, R1063 and R1064. They are on the acquisition board (bottom board) in the corner of the PCB over near the fan somewhere. If you are lucky, it'll be a board revision that has them accessible without removing the PCB. If not, I suggest soldering a DIP switch with thin wires so you can flick the switches (only with the scope turned off!) until the scope boots as a TDS782A.If you are successful, let us know the sequence for future reference!You will also have to remove one bandwidth-limiting capacitor per input too, I think they are C1266, C1267, C1268 and C1269, they are located near the hybrid input modules.I'll have to physically check for the 700 series, but the 2-channel 500 and 600 series had less acquisition parts than the 4-channel models, so it is not possible to convert a 2-channel to a 4-channel (I tried with a 600 series scope, and it just doesn't recognise the upgrade). A 2-channel scope will always be a 2-channel scope...Bear in mind that if you do perform the 1GHz hack on any of these scopes, they will only be calibrated to 500MHz, so they will not be calibrated in the top half of the frequency range, and the calibration process is not a simple task...... The scope will work to the full bandwidthUnlocking options is really simple if you have GPIB communications to the scope though, so that can yield some nice features if you don't have them yet.

author: nicnac117
author_rank: Contributor
timestamp: April 12, 2024, 09:39:55 am
content: Thaqnks , That has answered my question . I didnt know that there was a higher spec,d 24 varient . with a bit of luck i might find out !
What is the latest FW version for OWON HDS2102s? - Page 1
Forum section: electronics / testgear

author: TheRegister
author_rank: Newbie
timestamp: April 10, 2024, 06:13:09 pm
content: I have recently purchased OWON HDS2102s from AliExpress. It came with FW V4.3.0. I went to Owon support websitehttps://www.owon.com.hk/download.asp?category=Digital%20Oscilloscope&series=HDS200%20Series&model=HDS2102(S)&SortTag=Latest%20Firmwareand the latest FW version there is V1.5.1. Now I wonder if I should "downgrade" to that version or stick with FW V4.3.0. Is anybody familiar with this version?

author: csuhi17
author_rank: Frequent Contributor
timestamp: April 10, 2024, 07:28:01 pm
content: Quote from: TheRegister on April 10, 2024, 06:13:09 pmNo.Updates are not compatible.The number after the letter V is your main version number, if you have V4.x.x. then you can only update to the one that starts like this.The V1.5.1. and the V2.0.4. not good for you.There are no downloadable updates for V3 and V4.

author: TheRegister
author_rank: Newbie
timestamp: April 11, 2024, 08:36:47 am
content: Thanks for prompt response. Your reply is spot on - actually I've contacted Owon and they promptly responded with the following statement"Thanks for purchasing OWON product, there is not latest firmware version for HDS2102S on our website, don't upgrade any of firmware. "
Fluke 199B - Battery or board? - Page 1
Forum section: electronics / testgear

author: W4PJB
author_rank: Regular Contributor
timestamp: April 10, 2024, 12:58:12 am
content: I recently picked up a 199B with a bunch of test leads and an i2000 Flex high current probe for a nice price. The battery is completely hosed, but after letting it sit on the charger for a bit I was able to get it powered on, though it dies the second the AC adapter is pulled.The DMM inputs seem to work fine (just tested off of a 9v battery that was handy) but both the "A" and "B" channels of the scope are non-responsive.Could this be from the low battery? Or is it pretty safe to say there is a board issue with the RF inputs?My inkling is to return it ASAP and get a refund, but if there's a possibility that it's due to the low battery, maybe it's worth gambling $35 on a new one before giving up on it.

author: mahi
author_rank: Regular Contributor
timestamp: April 10, 2024, 06:05:35 am
content: The Fluke 190 series ScopeMeters should work just fine on the external power supply - even if there's no battery installed.The unresponsive A and B channels hint at a more common problem of these ScopeMeters: Dead ASIC(s)...

author: ZGoode
author_rank: Frequent Contributor
timestamp: April 10, 2024, 06:09:10 am
content: I agree with Mahi here, there is probably something else wrong here. If it turns on it should work completely fine regardless of battery condition. He's probably right about something wrong with the basics.If it was listed as completely functional, definitely return it. Its not worth the hassle since I don't think there is a schematic posted for this unit. Plus you probably wouldn't be able to source new ASICs anyways due to them being custom and all.

author: W4PJB
author_rank: Regular Contributor
timestamp: April 10, 2024, 11:59:40 am
content: Thank you very much for the replies and for confirming my suspicions. I had one of these years ago for work and it was a great unit for field use. I never recalled a dead battery giving me any issues when connected to AC power, but then again, I only ever had a battery that was drained and not failed. My thought was a failed / shorted battery could be pulling down a bus voltage or doing something else causing weird problems.I had read some posts about the ASIC chip. I am going to suspect this is the problem here, since both channels are failed.

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 10, 2024, 04:07:38 pm
content: I had a 199C at work. I can run it with AC even when the battery is completely dead. So I think there is problem with your scope rather than just the battery.
Uni-T UT58E on the 200MΩ scale - Page 1
Forum section: electronics / testgear

author: cosmicray
author_rank: Frequent Contributor
timestamp: April 08, 2024, 07:29:51 pm
content: I'm well aware that this meter is down-market for EEVBlog, but work with me for a moment.On the 200M Ω scale, with either the jumper clips or the test probe leads shorted together, I see9.96 MΩon the display.The manual says two things, and presumably they are additive ...Range 200M ΩResolution 0.01MΩAccuracy ±5% (reading-1000)+10)At 200MΩ range, the test leads are shorted and the displayed value is 1000 digits. To ensure the accuracy, please subtract this value from display reading.A '1005' chip resistor (in theory 10MΩ 2512 footprint) reads 19.92MΩIs all of that telling me that our ability to come anywhere near 0.0MΩ is non-existent and what you get is what you deserve ?

author: siealex
author_rank: Regular Contributor
timestamp: April 08, 2024, 09:53:58 pm
content: Subtract 10 MΩ from anything you see on the display. Such devices use a different method on 200 and 2000 MΩ ranges that always gives a constant shift by 10 or 100 counts. On the other hand, this method allows to measure up to 2 GΩ without using 100 MΩ or 1 GΩ calibrated resistors.

author: cosmicray
author_rank: Frequent Contributor
timestamp: April 10, 2024, 11:27:25 am
content: Thanks ! I'm still trying to wrap my head around the why. Measuring anything at that high of a resistance (in this situation above 2M Ω) has to be tricky, as the current flows will be very small. I guess the associated question is, why they chose to jump from 2M to 200M, instead of merely doing 20M instead. Are there that many valid use cases for measuring resistance above 20M Ω ?Otherwise, the DMM seems to be quite accurate on the other scales.
Help Rohde & Schwarz CMU200 Display Issue - Page 1
Forum section: electronics / testgear

author: jessejgm
author_rank: Newbie
timestamp: April 09, 2024, 10:48:53 pm
content: Goodnight. I'm wanting to buy this cmu200. But I'm in doubt because of the problem with the display turning orange. And there is no clarity.Could there be a problem with the screen? In the Capes?It is worth it?I'm a beginner in the area.

author: richnormand
author_rank: Unknown
timestamp: April 09, 2024, 11:02:01 pm
content: I think many old cmu200 have this issue.1)Usually from the corners and it creeps in.Fortunately here it looks like the display proper is OK.If I remember correctly it is an issue with the RF shielding layer on top and it can be removed.Should you need the ultimate RF specs you might consider some ITO coated glass , if not, then you are OK with a protective plastic.2)The display needs to be disassembled to see if the fluorescent lamps are the issue (brightness low) which would make the issue here worse from a colour point of view.3)some issue with the colour drivers to the display.Never seen that before but who knows???Again dismantling the front screen will be the way to know.Hopefully people more familiar with the issue will chime in.Cheers.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 09, 2024, 11:13:28 pm
content: Dont double post or triple post

author: jessejgm
author_rank: Newbie
timestamp: April 10, 2024, 01:03:13 am
content: I thought it might be the EFI glass.

author: gnif
author_rank: Unknown
timestamp: April 10, 2024, 02:43:39 am
content: Posting the same thing to multiple sections of this or any other forum is very poor form. Please refrain from doing this again in the future.
New toy scope, Fnirsi DSO153, claimed 1MHz/5MSps (April 2024) - Page 1
Forum section: electronics / testgear

author: tunk
author_rank: Super Contributor
timestamp: April 08, 2024, 07:23:21 pm
content: Looks like an update of the DSO152 with better specs:- one channel- 1MHz/5MSps- 10mV/Div-10V/Div- 500ns-20S- signal generator 0-10KHz, 0.1-3.3V, sine/square/etc.- screen 2.8", 320*240- size 99x68.3x19.5mmManual:https://img.wqdres.com/res/0/20240314/d0eadab1ea5140aa8328d3e987f7d77b.pdf

author: tunk
author_rank: Super Contributor
timestamp: April 09, 2024, 06:16:17 pm
content: A short review:https://mysku-club.translate.goog/blog/aliexpress/99752.html?_x_tr_sl=auto&_x_tr_tl=en&_x_tr_hl=noLooks like the price starts at $30 on aliexpress.Screendump of the PCB from the link above:

author: radiolistener
author_rank: Super Contributor
timestamp: April 10, 2024, 02:03:36 am
content: this voltage detector is too expensive
RF Test Automation  - Page 1
Forum section: electronics / testgear

author: vino
author_rank: Newbie
timestamp: April 12, 2024, 05:27:20 pm
content: Good Day Guys,I would like to ask expert advices because I'm very interested in doing RF test automation. As a newbie I would like to know where should I start? Is there a step by step procedure that I need to follow?Is there any websites, reading materials ,videos and etc. that this forum can provide. Thank you very much

author: alm
author_rank: Super Contributor
timestamp: April 12, 2024, 07:18:43 pm
content: This topic has been discussed a couple of of times on this forum (not specific to RF, but the principles are the same). Try using google (with site:eevblog.com) to search for topics like test automation, gpib or lxi. You will have to decide on an automation platform like NI LabVIEW (graphical programming, which might (or might not) be easier if you don't have much of a programming background), a real programming language like Python or C#, or scripting embedded in a tool like lxi-tools. It also depends on what type of instruments you use: Are they modern stand-alone instruments with LXI, older stand-alone instruments with GPIB or mainframe-based instruments like VXI or PXI(e). You probably already have some instruments.Depending on the type of tests, you may want to look into an RF switching matrix that can change connections under computer control. This allows you to for example connect 10 DUTS and 5 test instruments and connect each DUT to each test instrument in sequence.There is no step by step procedure because the steps depends on your use case. Just like there's no step by step procedure of "how to design a PCB". What kind of instruments do you have? What kind of programming background do you have and in which language(s)? What kind of tests are you planning to run?

author: Bud
author_rank: Super Contributor
timestamp: April 12, 2024, 08:58:25 pm
content: @OP do not double post same question in multiple subforums, this is not welcome here.
SDS814X SCPI Trigger Issue (Firmware bug?) - Page 1
Forum section: electronics / testgear

author: Omega Glory
author_rank: Regular Contributor
timestamp: April 10, 2024, 12:00:40 am
content: When issuing SCPI commands via USB to an SDS814X, I am running into what appears to be a firmware issue involving single capture triggering, and retrieving the waveform data.I can set the scope to single capture by issuing: "TRIG:MODE SING", but then when it comes time to retrieve the data by issuing "WAV:DATA?", while I'm able to capture data, it puts the scope back into RUN mode. This worries me because sometimes waveforms have to be transferred over with multiple calls to "WAV:DATA?" depending on how many sample points there are, and I worry that since the scope gets flipped into run mode, I might actually be retrieving chunks from different captures. Even if it is all coming from one capture, it doesn't seem like issuing "WAV:DATA?" should put the scope back into run mode.Has anyone else encountered this problem?Edit: Mods, I'm moving this to a different thread as suggested by tautech, please feel free to delete this.

author: tautech
author_rank: Super Contributor
timestamp: April 10, 2024, 12:03:43 am
content: Best place for this is here where more eyes will get to see it:https://www.eevblog.com/forum/testgear/sds800x-hd-bugswanted-features/
Fluke doesn't service the 11x series  DMM. - Page 1
Forum section: electronics / testgear

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 09, 2024, 01:11:41 pm
content: To my surprised that Fluke told me that they can't service the 116 DMM. The unit was under warranty and they told me to send it in for them to destroy and they sent me a new one. If it's out of warranty then you just have to buy a new one.

author: bdunham7
author_rank: Super Contributor
timestamp: April 09, 2024, 01:25:38 pm
content: Service by replacement makes economic sense if your average total cost of servicing it is more than the total cost of production in Malaysia or wherever they are made. They do list replacement parts and provide calibration procedures if you or a third party want to service it, so they aren't totally condemning them to disposability. For example, the LCD is p/n 2509955 and you can pick it up for about $46.What happened to yours? I had to send my first one back because all the letters were falling off the face.

author: BeBuLamar
author_rank: Super Contributor
timestamp: April 09, 2024, 02:22:50 pm
content: I don't know what the guy did to the meter. It seems that the jacks are no longer connected to the internal of the meter. The meter acts like you don't connect anything to it. All the switches work fine.
EEVBlog DM786 Gone Full Circle? (Edit: Not) - Page 1
Forum section: electronics / testgear

author: SeoulBigChris
author_rank: Regular Contributor
timestamp: April 07, 2024, 10:28:19 pm
content: Here is my EEVBlog BM786 at my rework test station in a short production run I just completed last week in South Korea. I was about to say that the meter has gone full circle, from Korea to Australia and back again. But on further checking, I don't think the Bryman is made here, unlike the 121GW. I should've brought it instead. I have both, but I've been using the BM786 more these days, and I think the reason is silly ... the size and shape of the 121GW make it a bit unstable on its bail. Surprisingly, the BM786 is taller but seems more stable on its bail. Time to 3D print my own custom bail.
R&S CMU200 trying to update  - Page 1
Forum section: electronics / testgear

author: MoodyRepair
author_rank: Newbie
timestamp: October 08, 2022, 02:10:50 am
content: I have a new to me Rohde&Schwarz CMU200 that is running V3.05. I am trying to update it to V5.22, it will load the update and restart.Boot looks normal until it defaults to a DOS prompt C:\INTERNAL\LOGS>I can set the default version back to V3.03 and it boots and operates normally.Wondering if anyone has seen this.Would like to update this unit but not a huge deal if I cannot.Also, I have no FM modulation option on the RF Analyzer/Generator screen. Is this normal?THANKS in advance for any information.George

author: bdunham7
author_rank: Super Contributor
timestamp: October 08, 2022, 03:08:33 am
content: This thread may be helpful. A lot depends on your installed hardware, but I ended up with FM Stereo signal capability on mine.https://www.eevblog.com/forum/testgear/enabling-options-for-rs-test-equipment/?topicseen

author: MoodyRepair
author_rank: Newbie
timestamp: October 08, 2022, 04:13:21 pm
content: This unit is a low serial number, S/N 100286 so it might not be able to update to the latest version V5.22

author: Robert999
author_rank: Newbie
timestamp: April 08, 2024, 09:10:16 am
content: Hello to all CMU200 device experts.I have two cmu200s that differ in options and age, the younger one does not have two generators and does not have an audio option and does not have OCXO B11. The older one, better equipped, has Audio options, OCXO B11, and two RF generators.My question is whether it is possible to replace the FRONT MODULE 1090.9244.XX. which is younger and put it in my older cmu200 but it is better equipped.Thank you very much for help .Robert
Pytanie do znawców  R&S CMU200 - Page 1
Forum section: electronics / testgear

author: Robert999
author_rank: Newbie
timestamp: April 08, 2024, 08:55:56 am
content: Hello to all CMU200 device experts.I have two cmu200s that differ in options and age, the younger one does not have two generators and does not have an audio option and does not have OCXO B11. The older one, better equipped, has Audio options, OCXO B11, and two RF generators.My question is whether it is possible to replace the FRONT MODULE 1090.9244.XX. which is younger and put it in my older cmu200 but it is better equipped.Thank you very much for help .Robert

author: Robert999
author_rank: Newbie
timestamp: April 08, 2024, 08:58:38 am
content: Hello to all CMU200 device experts.I have two cmu200s that differ in options and age, the younger one does not have two generators and does not have an audio option and does not have OCXO B11. The older one, better equipped, has Audio options, OCXO B11, and two RF generators.My question is whether it is possible to replace the FRONT MODULE 1090.9244.XX. which is younger and put it in my older cmu200 but it is better equipped.Thank you very much for help .Robert
Fluke 867B - Question about contrast - Page 1
Forum section: electronics / testgear

author: kblue
author_rank: Regular Contributor
timestamp: April 06, 2024, 09:04:51 pm
content: Greetings!I've got myself a Fluke 867b - looks and feels like new. Except for the screen itself ... if i change the contrast-setting to the far left, everything is good to read. One step to the left, its "okay-ish" ... one more step to the left and reading values becomes difficult. Now i ask myself, should i already buy a replacement from China? Will it get worse very fast with contrast to max to be able to read something?Are these screens "replacements", new-old-stock or already used? It's hard to find any information.Best wishes from germany!

author: mahi
author_rank: Regular Contributor
timestamp: April 07, 2024, 11:16:33 am
content: Setting the contrast only affects the LCD bias voltage. It has no effect on the lifespan of the LCD, but I've noticed that it can drift away from its center position over (many) years.I'm a bit confused by your description, though:QuoteThat does indeed sound like the center point has drifted away.QuoteWait, how can you go further left than "far left"? I assume you meant one step to the right?Anyway, the good news is the LCD voltage center point can be reset quite easily on the 867B:Rotate the dial to SET UPChange the contrast so that the display provides the best clarityPress the "Save Set Up" soft keyRotate the dial directly to the mV/HiZ positionPush the calibration button (hole on the right side, just below the DC barrel jack, that may be covered by a calibration sticker)Press the "Set Lcd Voltage" soft keyPress the "Abort Cal." soft keyThat's it. The new LCD voltage center position is stored!If you change back to SET UP, the current position should be in the middle. Since you were previously at the far left, you may want to test whether you can now improve contrast even further. If the contrast gets even better, you may want to repeat the steps above to update the center position once more.

author: kblue
author_rank: Regular Contributor
timestamp: April 07, 2024, 12:36:26 pm
content: Thank you very much! Ye, my description wasnt on point - my bad. Now everything is "back to normal" i guess. Right at center is good enough. Too far to the left, the display starts to flicker. Would be too much contrast anyway.
Power consumption logging using RD6006 over wifi - Page 1
Forum section: electronics / testgear

author: csvke
author_rank: Newbie
timestamp: April 06, 2024, 09:07:31 pm
content: Hi,Just joined this forum and tried to search for the answer but couldn't quite find it.Is there a way to use the Riden Rd6006, supply power to an appliance (say a ESP32), and logs its power consumption and control the Riden Rd6006 and export it's data via a web GUI in .csv?And thanks for the community, I have just flashed the Unisoft firmware and the ride-dongle alternative firmware.Thanks a lot.
Uni-T 8803E vs 8803N difference? - Page 1
Forum section: electronics / testgear

author: ms4sman
author_rank: Newbie
timestamp: March 29, 2024, 02:37:03 pm
content: Can anyone help me understand the difference between the 'E' and the 'N' versions of the 8803 bench meter?I can't seem to find anything online explaining what's the difference.Thanks!

author: JPKlitz
author_rank: Newbie
timestamp: April 06, 2024, 08:34:10 pm
content: HII'M not sure what the difference is. But I just got the 8803E model . big disappointment!Here's what I found so far and I've only had it for one day.I tested it against a fluke 87 and a BK PRECISION 391AList1 Defective test lead has intermittent fault. bad connection2 Reads low on DCV AND ACV COMPARED TO a fluke 87 and a bk precision3 Very slow reading takes significant amount of time for the reading to lock in.4 Reading diodes is defective. IT shows diode conducting in both directions I tested dozens5 Capacitor reading a 2200uf reads 2uf checked 8 caps same issue will not display property6 Using the usb to PC link software locks up the meter. I unplugged the meter from the usb cable still locked up. turning it off and back on still locked up! turned off foran hour. started working again.I haven't tested the current setting yet WOW do I want too.It came with a calibration cert I think that's got to be a joke.The case is huge heavy steel but the meters all on one board in the front display. the power supply is in the rear. It could be half the size would be way better takes up alot of space.THIS THING GOING BACK AT ITS JUNK. I know i can do better at 168.00:'(
Software for Hantek6074BC - Page 1
Forum section: electronics / testgear

author: badbyte
author_rank: Newbie
timestamp: April 05, 2024, 07:39:33 am
content: I have bought a Hantek6074BC and I wasn't able to connect it to the Digital Scope software. When starting the Digital Scope I get a popup with the message "The device is not connected!", I have attached a screenshot.Under File->Connect I was able to choose USB since I have connected it the DSO through USB. But no luck.Maybe someone could point me to the right direction about what I'm doing wrong...Thank you in advance.

author: coromonadalix
author_rank: Super Contributor
timestamp: April 05, 2024, 10:18:10 am
content: is the peripheral drivers are installed if it needs them, in device manager of windows do you see some errors related to that ?

author: badbyte
author_rank: Newbie
timestamp: April 05, 2024, 10:50:32 am
content: Windows lists the DSO in the device manager as attached in the screenshot.
FNIRSI 1013D tablet scope - display issue or normal behavior ? - Page 1
Forum section: electronics / testgear

author: pfm
author_rank: Regular Contributor
timestamp: March 30, 2024, 02:56:29 am
content: Just got a 1013D and have a couple of questions on what to expect from the display. The manual is of no help in this regard.- When the time scale is changed to 100ms/div or higher the bottom measurement panel (where it displays Vpp Vrms Freq etc...) disappears. It appears only from 50ms/div or lower. Is there anyway to lock it for high time scales as well ?- On very small signals (~10mv) when the vertical scale is changed between 100mv/div and 50mv/div there is no difference in the size of the waveform. But on slightly larger signals even like 100mv or more it works fine. Is this a defect ? Or is there some issue related to its minimum amplitude resolution ? What adds to the suspicion is that when it is switched between 100mv/div and 50mv/div I dont hear the relay click like I hear when switching between other ranges so surely its doing something different for 50mv/div.

author: Atlan
author_rank: Frequent Contributor
timestamp: March 30, 2024, 06:08:07 pm
content: 1. switched between 100mv/div and 50mv/divThis is a software issue, data from the 100mV range is multiplied by 22. When the time scale is changed to 100ms/div or higher the bottom measurement panel (where it displays Vpp Vrms Freq etc...) disappears. It appears only from 50ms/div or lower. Is there anyway to lock it for high time scales as well ?Property of the original firmware, it cannot be changed.https://www.eevblog.com/forum/testgear/fnirsi-1013d-100mhz-tablet-oscilloscope/2150/

author: pfm
author_rank: Regular Contributor
timestamp: April 03, 2024, 11:27:05 pm
content: I want to correct/add one piece of information in my original post -I said the second issue happens only for small amplitude signals. That is not true. It happens for any amplitude signal. Basically at and above 100ms/div when you switch between 100mv/div and 50mv/div there no difference in the amplitude of the displayed waveform. I would expect the waveform to double or halve based on the selection but it just stays the same. I think this is a bug in the software/firmware. Is this issue fixed in the github firmware ?Question # 3 - what is the minimum signal this scope can detect ? Looks like it may be about 10mv ? Isn't that too high as compared to other entry level scopes ? I thought it would be around 2mv ?

author: Atlan
author_rank: Frequent Contributor
timestamp: April 04, 2024, 05:05:14 pm
content: Sensitivity is 100mV/div. 8bit ad converter. 800mV /256 is 3,1mV per bit. Interference is 1-2bit. Maybe 2x3,1 is 6mV and more.

author: pfm
author_rank: Regular Contributor
timestamp: April 05, 2024, 01:04:53 am
content: yeah by my measurement its like about Vrms 8-9mv. Below that it does not register a good stable wave or any voltage or frequency measurement value.This for signals under 40khz only as I was using a soundcard for a test signal.
Keithley 2231A-30-3 RS232 communication slow on reading values - Page 1
Forum section: electronics / testgear

author: BennoG
author_rank: Frequent Contributor
timestamp: February 19, 2024, 06:45:41 am
content: Hi I was writing a PC interface for various power supply's I have for easy control and easy measurements.See animated gif (could not post mp4 files) for the layout and control.My problem is the 2231A-30-3 responds very slow to the measurements command (350 ms or so) and you can not combine measurements for different channels as far as I know.So now I am stuk at a horrible over 2 second update rate. Anybody has found a way around this problem ?I have the full .mp4 attached as a .zip archive.P.S. the sample is from a n6700B i bought from e-bayBenno

author: BennoG
author_rank: Frequent Contributor
timestamp: February 20, 2024, 09:59:42 am
content: I solved the problem on the slow response (for anyone who has the same problem)The initial problem was the 350 ms delay caused by the MEAS:VOLT? and MEAS:CURR? commands.According the documentation you can also use this commands without the question mark, so no answer expected from the PSU.In the mean while question and set the other channels. and when you are back at this channel you can query the MEASure result with the FETC? and FETC:CUR? commands.With this trick I get an update rate of about 0.5 - 0.7 seconds.If I have time will release the C# code on GitHub (after I cleaned the code from all the prototyping)Benno

author: dsekine
author_rank: Newbie
timestamp: April 04, 2024, 10:04:09 pm
content: Hey BennoG,I’m having the same problem. The Keithley is taking 0.3 to 0.4 sec to respond to a single query.Could you post your C# code to a GitHub repo? I could really use some advice on this. Too slow = not useful for my application as well.

author: BennoG
author_rank: Frequent Contributor
timestamp: April 05, 2024, 07:06:10 am
content: as attachment to this post.It is a visual studio 2022 forms project including source code.when there is no communication or wrong serial port it minimizes to system tray and shows again when there is communication.parameters "SCPI:COM9,9600" to use it at COM9 (default COM1 9600 baud)Double click on the icon in system tray to make it appear without serial communication.Benno
[Solved] Siglent 1000X-HD - SMB Share not working - Page 1
Forum section: electronics / testgear

author: BreakingOhmsLaw
author_rank: Frequent Contributor
timestamp: April 04, 2024, 07:54:17 pm
content: Hello everyone.I've finally gotten my Siglent 1204X-HD, and I am trying to set up the SMB directory linking it to my Synology NAS. No luck so far, and all I'm getting is an error message "Mount directory Error, please check your parameters".I've set up an SMB user for the scope, and the share works just fine from my PC.My best guess is that the format needs to be something different from the//server/sharesuggested by the manual. Has anyone gotten this to work and can provide a hint?Solved. Right format is \\server\share - backslash instead of slash.

author: blackdog
author_rank: Frequent Contributor
timestamp: April 04, 2024, 07:57:29 pm
content: Hi,You may need to adjust the SMB level of your Synology nas so that it also supports SMB-1.In terms of security, that is not a good option, but you can at least try it for a while to see if you can then access the Synology share.Kind regards,Bram