I have been trying to find a better way to measure current on a 20khz PWM signal. This amplifier is 3 phase and is connected to a brushless servo motor with a leadscrew and about a 300 to 400 lb mass. On the 10 khz amps I have been able to use a DC clamp but the 20khz is out of the clamps range. I have a couple of emails out for a Wavetek Meterman AC68 clamp but no replies to date. I am trying to analyze the quality of the attached leadscrew's preload and have been monitoring it from the analog +-10vdc drive signals oscillation. The problem with this method is the mass and speed varies from situation to situation so it is only of marginal use. Any and all replies are appreciated, even if it's just a guess it may put me on the right track. Googled out on this one! Thanks in advance, Ross
- posted
20 years ago