XYZ scan controller too slow

[lindope]

Well my problem is knowing when the coarse positioner is "close enough" to start scanning and use the fine Z movement of the piezo tube.

Right now I can send "bursts" of 1KHz sawtooth but I need to send individual sawtooth ramps so I can check for tunnel current after each step. Because typically if i send a burst of 10 ramps (which is the smallest I've been able eek out of my current design) it may be close enough after 5 so after 10 it crashes.

[lindope]

Actually, I'm getting about 20-40 ms of sawtooth bursts by changing the loop iteration equals value to 1, which at 1Khz is more than ten ramps, but that is too much to obtain the control I need. I'm not even sure if sending individual ramps will move it, but I'd like to try. I've tried changing all the values around in this vi but I'm guessing I need to make a separate vi to do a single ramp.