Recent Posts

1

Beginners / Re: Quickly Triggering Sensors - need an oscilloscope? what specs? (AU)

« Last post by DimitriP on Today at 01:28:24 am »

Oscilloscopes are for displaying signal waveforms, not creating them.

At least add that this is a job for a pulse generator or a fancy function generator and save me some typing    
https://www.edn.com/create-short-pulses-with-a-function-generator/

2

Test Equipment / Re: Siglent SSA 3021X... Ooops

« Last post by tautech on Today at 01:21:11 am »

Hi,

I think I accidentally overloaded the input to my SA one too many times. My input impedance is no longer 50 Ohms. It still functions sortof.

I took the input board out and started looking around. I saw a 49R9 resistor which I assume is the termination resistor, it actually measures fine. I it looks like there are some clamping diodes on the input path and they seem fine. the input cap measures at 1uF, seems OK. Nothing looks like it got toasty.

The first IC in the input path is U1 a 956p, the 49R9 resistor is after that component in the path. Makes me wonder if that is the part I damaged.

I can't find any info on what that part is, anyone here know? Has anyone found schematics for this SA?

After some research, I believe the part is a GaAs MMIC. Still can't find a datasheet for the 956P to be sure.

Thanks
Joel

Sanity check:
Preset.
Connect TG to RF IN and apply -20dB TG signal.
Sweep should be at a -20dB level.

Post screenshot.

3

Beginners / Question about use of Differential using scope USB port

« Last post by watchmaker on Today at 01:16:22 am »

The MicSig probes use the USB port of your scope for the power supply.

Excluding operator error (ignorance? stupidity?) such as putting both hands on the work or working in an electrically unsafe environment, does this mean that the things discussed here about grounding out the scope are avoided?

And for those who missed it in Test Equip, Amazon has a coupon for the Micsic DP10013 which drives the price to $150 USD.  This price is only marginally higher than a store bought isolation transformer.

4

Test Equipment / Re: Siglent SDS2000X Plus - Bugs / Missing Features / Feature Requests

« Last post by Wrenches of Death on Today at 01:14:01 am »

The backlight is LED, so it's not likely to ever wear out, as it were.

I've replaced a a large number of them in flat screen televisions. LED's don't last as long as it is commonly believed.

WoD

5

Test Equipment / Re: Siglent SDS2000X Plus - Bugs / Missing Features / Feature Requests

« Last post by BillyO on Today at 01:09:53 am »

I don't want to waste extra energy on the screen,

Understood.

6

Microcontrollers / Re: Has anyone used ASAN & MSAN, and relevance to embedded arm32

« Last post by NorthGuy on Today at 01:08:49 am »

If you want to test memory allocation/use on Linux, use Valgrind.

7

Projects, Designs, and Technical Stuff / Re: general purpose optics equipment?

« Last post by coppercone2 on Today at 01:08:16 am »

OK i got some collimator lens and a diode mount that sits diodes in a place where I can attach a little heat exchanger to them do temperature control for experiments (copper)

the prices are not people friendly (and fuck europe shipping!!!), but getting the emitter section and safety right, lets me allow for messing around with the subsequent optics, hopefully at a much lower cost. (adjust prisms, mirrors, screens, etc), hopefully maybe with some scavanged and DIY stuff. I have a bad feeling about the cheap chinese mounts and optics, as simple as it seems. at least the first stage will be quality and I can maybe identify or qualify subsequent parts if I have confidence about the first part

Building your own laser diode mount seems akin to building your own power supply chassis, which is a bit much for beginners. I hope the thermal contact surfaces will be good and that it mounts well and is more stable then something I can put together myself, that I will not need to fight with a tapered, oval or otherwise messed up bore for mounting diodes. That will probobly end with buying a special reamer and lapping tools lol


I can also do some testing on the electrical supply and hookup method with cheap diodes before I start getting optical system elements. I want to standardize the electrical hookup in my own way

also trade the steak for a baked potato to pay this expensive ass shit off. glad i did not throw away that old potato, its actually fine to eat. and I spent the entire week sharpening damaged ass kitchen knives so I don't buy that new set I was planing on

8

Test Equipment / Re: Siglent SDS2000X Plus - Bugs / Missing Features / Feature Requests

« Last post by KungFuJosh on Today at 01:07:49 am »

Is there any reason or evidence to think that a screen saver is even required for this kind of screen?

The backlight is LED, so it's not likely to ever wear out, as it were.

I don't want to waste extra energy on the screen, especially when the screen is supposed to be off. Whether or not the screen itself needs it, I dunno.

9

General Technical Chat / Re: Post a picture of a cat!

« Last post by xrunner on Today at 01:06:57 am »

Walked up to him and he was sleeping - no movement. I said "Maxim it's time to get up". His tail twitched a few times. I waited and he remained motionless. Then I said the same thing again. His tail twitched a few times again. He must be aware of my voice but remains asleep - or so it looks like. 

10

Beginners / Re: Quickly Triggering Sensors - need an oscilloscope? what specs? (AU)

« Last post by Ian.M on Today at 01:06:17 am »

Oscilloscopes are for displaying signal waveforms, not creating them.