home-built high voltage controller

[xjlsu]

Hi all,

We have a home-built high voltage controller ( -5 kV ~ +5 kV). On the box, there are only two dials which adjust positive voltage and negative voltages individually. We use NI USB-6008 DAQ and Labview 8.6 version. The question is how to program the sequence as follow.

When the high voltage is turned on. Positive voltages go first from 0 to +5 kV, then negative follows from 0 to -5 kV.

When the high voltage is turned off. Negative goes first from -5 to 0 kV, then positive voltages change from +5 to 0 kV.

All the adjustment is kept at a rate of 1 kV/min.

Thanks.

[johnsold]

We need more information to answer your question.

How is the USB-6008 connected to the controller? In other words, what output from the USB-6008 correlates with what output voltage from the high voltage supply? Are you measuring the voltage so that you have closed loop control or is it just open loop control?  If the dials on the box are set to a particular voltage, what effect does that have on the USB-6008 control?

Lynn

[Dennis_Knutson]

If I understand correctly, you need a basic state machine. An initialize state where you sequence and ramp up and and shut down state where the supplies are rampled down in a specific order. There could be as many other states as you require (i.e. perhaps an error handling state).