i'm not familiar with multisim i got the demo yesterday so i can test some circuits without actually build them... but before that i had to learn Multisim a bit, so i had to start with simple ones as the photo shows.
But i'm facing difficulties... the multimeter doesn't always measures and also the oscilloscope.
in the photo i'm posting i was able only to use the oscilloscope but the multimeter shows nothing no matter how i'm connecting it.
and i'm also having the impression that sometimes the multimeter gives false readings...
Oscilloscope doesn't work because you didn't connect the - of A channel. Connect it to your circuits ground.
I used to use Multisim and all i have are bad experiences with it. It's performance is slow when simulating circuits and if there is any active elements it tends to be vary inaccurate and mostly produce false results. I tried simulating the vary basic transistor circuits as well as more complex circuits with integrated circuits and >2 active elements.
I switched to LTSpice VI and it is A LOT better. It is fast and so far accurate.
You can get LTSpice here: Linear Technology - Design Simulation and Device Models
I tried and everything is working. Oscilloscope is working and multimeter gives all readings. Works fine. As i said in my post before. YOU NEED GROUND !
I tried and everything is working. Oscilloscope is working and multimeter gives all readings. Works fine. As i said in my post before. YOU NEED GROUND !
I tried and everything is working. Oscilloscope is working and multimeter gives all readings. Works fine. As i said in my post before. YOU NEED GROUND !
What do you mean,"it does nothing"? Your scope seems to show an output. That indicates that Multisim is working. It may not be what you expect. That is generally a problem with you circuit, not with the software.
What were you expecting?
What do you mean,"it does nothing"? Your scope seems to show an output. That indicates that Multisim is working. It may not be what you expect. That is generally a problem with you circuit, not with the software.
What were you expecting?
I was wondering about the 4.7pF cap. If the scope has infinite input impedance, then it doesn't matter what value the cap is. Personally, I would get rid of the cap and connect the scope directly to the collector.
I don't know why the multimeter doesn't work.
I think this statement of yours is ironic:
Ltspice is known to me long time now...but it's not so friendly as multisim.
but for some reason i think that i must be doing something wrong and that's why it behaves like that! i can't believe that it can't work correctly with such simple circuits.
Put the cap back in after you figure out why you are getting pulses on the output (I'm assuming you were expecting a sine wave).
PS I know why. Do you?
That generator your using i never used anywhere.
So i tried with it and with an AC source. Results were the same.
Considering multimeter, it takes time for it to start displaying values (5-10 sec).
Also values oscillate from 40mV - 350mV (it doesn't oscillate for ac source).
Put the cap back in after you figure out why you are getting pulses on the output (I'm assuming you were expecting a sine wave).
PS I know why. Do you?
i'm getting pulses no matter what i do with the capacitors! the difference without capacitor is that dc offset exists.
i guess the signal is clipping... but that's minor... while i don't know wht's wrong! maybe i should change vesion of multisim?! to be exact it's not 10 it's 10.1.............................................
i'm getting pulses no matter what i do with the capacitors! the difference without capacitor is that dc offset exists.
i guess the signal is clipping... but that's minor... while i don't know wht's wrong! maybe i should change vesion of multisim?! to be exact it's not 10 it's 10.1.............................................
You get pulses because the gain is too high for your signal amplitude, as Audioguru said. Make the input voltage lower, or put a resistor between the signal generator and the input capacitor.