I am looking for a PC scope capable of measuring duty cycle of a 15V/500 HZ square wave. The duty cycle is checked at three percentage levels, 10%, 50% and 90%. The accuracy required will be 1.8 +/- .036 mseconds for 90%, 1.0 +/- .020 mseconds for 50% and .200 +/- .004 mseconds for 10%. The normal procedure is to connect the signal to a scope and adjust it to the above tolerances. My main question is this possible with one of your PC scopes. If not, please let me know what tolerances are capable at each level. The other measurement that will have to be made is a 10 V PK-Pk sine wave at 3847.5 HZ to a +/- 120 HZ. I would think that this wouldn't be a problem with any of your scopes. Please let me know the which scope is required. I will need dual input with internal triggering (minimum). We are currently using a digital scope but I would like to replace it with a PC scope and use the digital scope for another application. I was looking at the ADC-100, ADC-42 and Picoscope 3204. How about calibration? Is there away verify the calibration periodically.
Michael V. Ray
Sr. Electrical Engineer, Controls
Westinghouse Air Brake Company