jrz126
Active Member
Hi all, I'm working on this simulator at work and I'm having a problem.
I'm trying to measure the 'on' time of this 100Hz PWM signal, but I kept getting a measurment of 2uS (the smallest pulse width that the simulato card can read). I hooked up an O-scope and I'm getting a bunch of high freq. noise. So I think the noise is causing my 2uS reading.
The card that is putting out this PWM signal basically just switches a mostfet with this pwm signal. (so it basically acts as a switch). I know that I am getting a good PW signal because I am able to read it just fine using a handheld fluke.
So whats the best way to filter this?
oh, and this is kinda what the scope looked like. only Im using a 0-5V square wave
**broken link removed**
I'm trying to measure the 'on' time of this 100Hz PWM signal, but I kept getting a measurment of 2uS (the smallest pulse width that the simulato card can read). I hooked up an O-scope and I'm getting a bunch of high freq. noise. So I think the noise is causing my 2uS reading.
The card that is putting out this PWM signal basically just switches a mostfet with this pwm signal. (so it basically acts as a switch). I know that I am getting a good PW signal because I am able to read it just fine using a handheld fluke.
So whats the best way to filter this?
oh, and this is kinda what the scope looked like. only Im using a 0-5V square wave
**broken link removed**