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Metrology / Re: ADR1001 - Ovenized Voltage Reference System
« Last post by iMo on Today at 07:41:52 am »My ADI's ordering page shows out of stock, ordering in min 260pcs. quantity, ships in 10 business weeks..
Recent Posts
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Test Equipment / Re: Test Equipment Anonymous (TEA) group therapy thread
« Last post by Robert763 on Today at 07:33:49 am »Hi,
Nice PCB.
Was there a reason you didn't include the tip isolation network?
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Just a 91k resistor on each line would get the DC levels correct. Even a 100k which is easily available as 8 in a single package would be better than nothing.
Information on LA probing is available from Keysight. https://www.keysight.com/gb/en/assets/7018-06707/data-sheets/5968-4632.pdf
See page 47.
Robert.
Nice PCB.
Was there a reason you didn't include the tip isolation network?
[ Guests cannot view attachments ]
Just a 91k resistor on each line would get the DC levels correct. Even a 100k which is easily available as 8 in a single package would be better than nothing.
Information on LA probing is available from Keysight. https://www.keysight.com/gb/en/assets/7018-06707/data-sheets/5968-4632.pdf
See page 47.
Robert.
3
Power/Renewable Energy/EV's / Re: Aussie Fast Charger Company Tritium Goes Bust
« Last post by .RC. on Today at 07:33:44 am »It was aptly named. Bright to begin with, then faded with time.
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Test Equipment / Re: SDS800X HD - Issue disscusions - is it me, or the scope?
« Last post by 2N3055 on Today at 07:33:24 am »I have setup a qualified trigger that does not trigger at all on a 100mv/div scale. The edge trigger does trigger on this signal down to 5mv. Signal is from ~0 - 2.7V
Let's see, analyse and think:
At 100mv/div full scale is ± 400mV.
Signal is 2.7V P-P, but if it is not centered on the screen with offset it has 2.7 V peak value.
That means that signal is 3-6,5x larger than dynamic range of scope. You are overdriving inputs and ADC.
For scope functions to work properly signal has to fit on screen of the scope.
That is basic thing.
Since Edge trigger only looks for a slope in vicinity (close to) trigger level it usually works even in this situation of completely overdriven signal.
But other trigger types (or any other function of the scope to that matter) that relies on state, and previous states, it might not work. If it has no valid data.
It might work but it doesn't have to.
That being said, on my scope, it seems to (miraculously) work.
I start wondering if my scope hase some issues itself, but then many other issues were confirmed by others...
What was also confirmed by many others are many false alarms and errors you made and then blamed scope . That is why we say a methodical approach is needed and good detailed explanations are needed.
For instance, you NEVER write what FW you are running at the time you encountered something that is suspicious behaviour or bug.
So in few weeks from now, when stuff is fixed nobody in the world will know if all the stuff you reported is still suspicious or that was some old initial FW that is not relevant anymore.
Like I said before but it fell on deaf ears.
You can stop writing about bugs, looking for them, or investigate them at this moment.
You are wasting your time (and ours if we decide to read).
There is imminent FW release being tested, as we speak.
Wait for a bit until new FW comes out. Then start first with all the stuff that was reported in release notes that will come with it, then all the stuff that was reported and you don't see them in release notes.
This is my advice to you. You don't have to listen, of course.
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Manufacturing & Assembly / Re: AXI (xray inspection) licencing / regulatory requirments in Australia
« Last post by loki42 on Today at 07:32:47 am »Thanks for the info. Process and prices don't look too nuts. There was one at an auction that I thought might go cheap. I'm also wondering about the utility vs aoi given the extra effort required. Mostly I'm keen to spot soldering issues.
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Buy/Sell/Wanted / LFS I want to buy a Fluke 9100
« Last post by qudianzhuang on Today at 07:30:30 am »I am looking for a Fluke 9100, fault machine and normal function are acceptable, the price is not too expensive.
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Projects, Designs, and Technical Stuff / Re: Precision Load Cell (Wheatstone Bridge) Simulator
« Last post by hozone on Today at 07:29:01 am »Thank you for suggestion.
I know falstad.com but I've simulated it in LTSpice, that is a little better than falstad.com
You can find the LTSpice simulation file above in my posts (it's the .asc file).
I know falstad.com but I've simulated it in LTSpice, that is a little better than falstad.com
You can find the LTSpice simulation file above in my posts (it's the .asc file).
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Test Equipment / Re: SDS800X HD - Issue disscusions - is it me, or the scope?
« Last post by ebastler on Today at 07:20:54 am »I just gave the Qualified trigger a quick try and cannot reproduce your issue so far.
Using 0V .. 3V pulses on both, the Qualified and Edge channel, I can happily overdrive the channels at 100 mV/div and higher sensitivity. Qualified trigger remains stable for me. Please provide further details on your setup and signals.
One caveat: In Qualified trigger mode, pushing the trigger threshold encoder has a different function than normally. It does not set a default (halfway) threshold, but toggles the threshold knob between controlling the Qualified and Edge channels. Did you possibly set unintended threshold values due to that?
Using 0V .. 3V pulses on both, the Qualified and Edge channel, I can happily overdrive the channels at 100 mV/div and higher sensitivity. Qualified trigger remains stable for me. Please provide further details on your setup and signals.
One caveat: In Qualified trigger mode, pushing the trigger threshold encoder has a different function than normally. It does not set a default (halfway) threshold, but toggles the threshold knob between controlling the Qualified and Edge channels. Did you possibly set unintended threshold values due to that?
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Repair / Re: HP 8566B CRT focus problem
« Last post by Greybeard on Today at 07:15:19 am »Check all voltages at the CRT.
Check resistance of all resistors and potentiometer and solder joints in the focus resistor chain.
May be this helps:
https://www.jvgavila.com/hp8566a.htm
Check resistance of all resistors and potentiometer and solder joints in the focus resistor chain.
May be this helps:
https://www.jvgavila.com/hp8566a.htm
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RF, Microwave, Ham Radio / Re: RF 2.4GHZ through Via
« Last post by uer166 on Today at 07:14:20 am »At 2.4GHz the via is likely not the problem. That antenna layout is crap-tastic. When you say you have low Tx, did you measure it at the SMA connector conducted using a spectrum analyzer? What dBm do you expect and what did you get?