Newport NPC DIG Series, Инструкция по эксплуатации, Страница: 23 / 34

23
1 = starts scan
trgss trigger generation stroke position start minimum: >0.2% of total stoke to
maximum: total stroke minus 0.2% of total
stroke [µm] or [mrad]
trgse trigger generation stroke position end minimum: >0.2% of total stoke to
maximum: total stroke minus 0.2% of total
stroke [µm] or [mrad],
always keep: trgse > trgss !
trgsi trigger generation position intervals >0.05% of total stroke in closed loop
[µm] or [mrad]
trglen duration of trigger impulses n * 20µs n=1...255
trgedge trigger generation edge 0= trigger generation off
1= trigger generation at rising edge
2= trigger generation falling edge
3= trigger generation at both edges
table 7: commands with values
Note
*
1
: The controller cyclically transfers the newly measured value to the signal buffer of the
interface every 500 milliseconds. This value can then be read out via the interface.
Subsequent increasing of the query sequence for this value does not increase the
refreshing rate. If the piezoelectric actuator moves with higher frequencies, aliasing occurs.
In this case the displayed values no longer correspond with the actual motion value!
Example:
An actuator with 80µm displacement in closed loop should take a swing in rectangle mode from
20µm to 50µm. It should stay 50ms on 20µm and 150ms on 50µm. The reaction of the
measurement system is connected to the monitor output.
commands:
- cl,1
Enter switch on closed loop
- gfkt,3 Enter generator function rectangle
- gfrec,5 Enter frequency rectangle = 1 / (50ms + 150ms) = 5Hz
- garec,37.5 Enter amplitude rectangle = (50µm
– 20µm) / 80µm * 100% = 37.5%
- gorec,25 Enter offset rectangle = 20µm / 80µm * 100% = 25%
- gsrec,25 Enter symmetry rectangle = 50ms / (50ms + 150ms) * 100% = 25%
- monsrc,0 Enter set monitor source to position value in closed loop