E
EdV
- Jan 1, 1970
- 0
I have a dedicated production test system that uses a Tektronix
oscilloscope which does not have isolated channels. I have to measure
the "lag time" between the falling edge of one IGBT H bridge drive leg
and the rising edge of another. It is specified to be 3 to 5
microseconds. Of course these signals are referenced to to different
"grounds".
I thought a simple opto isolator circuit would do the trick but as I
look at parts I get the feeling I am going to stack up enough
propagation delay that measuring 3 to 5 microseconds is not going to
have the needed preciscion.
Maybe drive a resistor and then use diff amps?
Your thoughts as always are welcome.
Thanks,
Ed V.
oscilloscope which does not have isolated channels. I have to measure
the "lag time" between the falling edge of one IGBT H bridge drive leg
and the rising edge of another. It is specified to be 3 to 5
microseconds. Of course these signals are referenced to to different
"grounds".
I thought a simple opto isolator circuit would do the trick but as I
look at parts I get the feeling I am going to stack up enough
propagation delay that measuring 3 to 5 microseconds is not going to
have the needed preciscion.
Maybe drive a resistor and then use diff amps?
Your thoughts as always are welcome.
Thanks,
Ed V.