Some simple oscilloscope questions (an anomaly+care) - Page 1
Forum section: electronics / beginners

author: TriodeTiger
author_rank: Regular Contributor
timestamp: May 18, 2012, 11:28:11 pm
content: Today I had trekked down to the post office (missed two delivery attempts apparently) and brought home my new.. Tektronix 2215 oscilloscope! It was more awkward to carry than heavy at least.After finding out the calibration knob on the time base had to be clicked all the way to the right, I get now a stable waveform and the calibration signal is excellently clear and stable.-----------------------------------------------(Nevermind next bit, thank you amspire!)I got so excited I had to make some sort of signal, so I through some code on an Arduino. My question is: Why does it have a sluggish fall like this?Now of course I can consider that PWM/digital devices do not care about that slope, although I'd rather understand if it is the Arduino being lazy, the cabling and whatnot inbetween making some impedence/capacitor? or the scope probe itself (even if near same frequency as the test signal)Silly code was this:Code:digitalWrite(9, HIGH);delayMicroseconds(100); //10% duty @ 1kHz, or somethingdigitalWrite(9, LOW);delayMicroseconds(1000 - 100);---------------------Also on to caring.. With some common sense I have considered:- Position wave forms off screen when not in use- Turn intensity down to something reasonable, as it is all visible to me anyway- Turn off if not using for more than 5 minutesMaybe the last one I am concerned about, does turning the screen on cause more wear and tear than leaving it on for say, 5 minutes I am not using it?What are some other tips for care?The handle seems very tight against the case, is it supposed to pivot to go under the device to raise the screen up, or is that something different? May try some WD-40 if I get the nerve to.

author: amspire
author_rank: Super Contributor
timestamp: May 18, 2012, 11:37:20 pm
content: Before the commands you posted, did you have this?Code:pinMode(9,OUTPUT) ;

author: TriodeTiger
author_rank: Regular Contributor
timestamp: May 18, 2012, 11:44:03 pm
content: Quote from: amspire on May 18, 2012, 11:37:20 pmYou know, I caught that, but assumed it was all right because it was outputting data. It now makes a precise 10% width signal now with no visible slope at all. I think my excitement overtook my common sense. Can't remember why it would do that though if not set to output. Thank youI am taking a break with dinner and a movie. That'll be refreshing.

author: tekfan
author_rank: Frequent Contributor
timestamp: May 19, 2012, 12:26:30 am
content: You might want to read this thread to see how to prolong the life of your CRT and scope:https://www.eevblog.com/forum/general-chat/oscilloscope-lcd-screens-versus-crt-screens/msg61973/#msg61973

author: TriodeTiger
author_rank: Regular Contributor
timestamp: May 19, 2012, 04:02:37 am
content: Will do, the intensity hint seems like a good idea. I suppose the CRT being in good enough shape, and flyback not generating any noise over anything else in all right condition from the era I suppose it will last me well.I plan on getting a PC scope or something DIY to serve me for digital storage and will abuse that, and then only use my analogue when I need it or for nostalgia(goes off to view varying PWM signals)Alexander.