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#1
Thanks guys
Trying to remember from last night but I think it is called amprobe fp700

2A 1500V fast blow

8x65 mm

#2
Last night I learned that he/she who uses multimeter to measure current but forgets to switch positive lead back before measuring voltage finds themselves looking online for a $30 fuse

 :P  :'(  :)
#3
I thought I would I submit a graphical image of how I feel when you and the others are discussing tech in other threads





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 :P


But thanks you guys rock  8)  :)
#4
Congratulations on the fix

Very impressive

 8)  :)
#5
Yes sir thank you

:)

They also had me put a 10 ohm resistor in series and measure the voltage drop across it then calculate current V/R and it was spot on to the ammeter current reading

I was impressed kinda makes you wonder why even bother with putting an ammeter in series

:(  :P

#6
Today was somewhat exciting as it marks the first experiment to measure current

My assignment in my book was to lay out a circuit with a 1.5k resistor and measure current at 6, 12, and 18v then compare with calculated

For some reason I was really nervous shaking like a leaf idk yeah I was kinda freaked out thinking I was gonna blow something up

Especially when I had to take it up to 18v

But it went off without a hitch. All good

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 :-[  :P
#7
last night i ordered some old millammeters 0-500 and some centered plus and minus

probably too big for what I need but i figured i would start somewhere and try not to blow em up

I really want to get a blue anatek esr meter but i am gonna make myself build one (diy esr meter) on my own first

I have looked at a few put together on videos and various schematics

I guess i need to breadboard it first then try to assemble a diy version

everything i see says i need a microammeter so i may have to scare one up

 :P
#8
I need some ammeters for my little textbook exercises.

I have been trying to figure out the difference in ac and dc meters.

Im def old skool and have been browsing various junky analogue meters on the auction site. I like the ones that have different terminals so I can start out high and not accidentally blow it up.  :-X
I know i can use my dmm to measure current but i really would rather use something expendable  :P

another problem i have with analogue is im no expert at knowing polarity so maybe if i connect it backwards it wont be good for the meter...whereas a digital would just tell me minus microamps ?

I have some old ammeters that are way to big to measure stuff like micro and milliamps.  I know I can do some calculations and add resistor shunt to make a little meter measure larger but I dont think I can go the other way...ie make for example a 15 amp simpson meter measure micro or milliamps.

peace out

 :)
#9
I needed to color code my scope probes...

y was easy...put yellow there

for x I had a choice of blue green and pink

so as a tribute to Paul Gilbert I picked pink for X
:P

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#10
I was gonna break this down and put everything away then I remembered I had some zener diodes

so i grabbed one and tried it

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then swapping ends

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so that is cool i just dont know why everything is bassackwards

 :(  :P

also i used to think these were cool heck i cant get away from them

this is what i see with the circuit open

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 :P


EDIT wondering now if i should have switched the scope probes
I did swap the transformer leads but should it really matter since its alternating current

#11
I went back to try this with 120k ohm
albeit conceding there is probably a myriad of other mitigating factors messing this up that are beyond my comprehension.
but alas it was worth a shot and thanks to G1 for pointing that out... :)

so off we go..dialing in 120k ohm

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and I was able to obtain some much coveted (ugly) L shaped wave form from a diode...just not in the preferred orientation

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I spent a few mins switching ends on the diode and attaching and disconnecting scope lead ground clips and couldnt really make any progress.

I imagine there are some strict parameters that need to be observed for this to work...idk

but it was a cool experiment

 :P
 
#12
thank you sir

ha ha too funny when i went back to look at my pad I turned on my calculator and it displayed the last calculation


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 :P
#13
oh yeah forgot to put this in

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 :P
#14
the weather here has been crappy so I set out to make a little component tester
here is a schematic from a video by w2aew

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an old transformer I had was at one time showing 16.3v

so I did some math and figured i needed about 1.2M ohm

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then i went about setting everything up using the transformer, decade box, breadboard, oscilloscope

I was extremely pleased to obtain a typical y=mx+b type resistive sloped rise

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but after that nothing worked out too well.  in fact i was able to obtain a lissijou? shape and I had no capacitor connected.  yet when I tried a capacitor i just got a line.

what I really wanted was a nice L shape from a diode so I eagerly connected one but no L were to be had.

I tried different directions and ground  clips and trigger modes etc but eventually gave up.

 :'( 


#15
yes sir thanks

its also nice how the cord is not inside the tube it can rotate with the upper section

 :)