Scan Function - piezosystemjena d-Drive Bedienungsanleitung

Example:
An actuator with a closed loop stroke of 80 µm is used as follows: rising edge (trgedge,1), start
point 10 µm (trgss,10) end point (trgse,30) and interval 5 µm (trgsi,5), i.e. trigger points are at 10,
15, 20, 25, 30 µm. After reaching Position 10 µm (from a lower position; rising edge!) the trigger is
set and the next trigger point will be calculated (15 µm), the trigger output will be reset after n*20
µs (trglen,n) and the trigger function is waiting to reach the next trigger position (15 µm) and so on.
After reaching the 30 µm position, the next Trigger position is set to 10 µm, the trigger impulse will
be generated when the 10 µm position is reached from a lower position than 10 µm (rising edge).
The recognition of edges works as follows:
During the rising edge, the highest measurement value (position) will be stored. If there is a
decrease in the measurement value of more than 0.2% (of total stroke) under the stored value, a
falling edge will be recognized. During the falling edge, the lowest measurement value (position)
will be stored.
If there is an increase in the measurement value of more than 0.2% (of total stroke) over the stored
value, a rising edge will be recognized.
This principle depends on whether or not trgss and trgse are bordered by a working area that
crosses at least 0.2% (of total stroke) out of the borders.
lower trigger position
trgss
this is the lowest value where a trigger signal is
generated
trgse upper trigger position
this is the highest value where a trigger signal is
generated
trgsi trigger interval
this is the distance between the trigger points
trgedge trigger edge
this value depends on which direction the trigger
point must be reached for trigger generation
trglen trigger length
this values depends on the duration of a trigger
impulse

8.8 scan function:

The scan allows the output of exactly one period of the function generator (sine or triangle). This
will require that the relevant functional parameters be set (frequency, amplitude, offset or
symmetry). The function generator does not need to be activated (gfkt,0). To select a scan, set the
scan type to sine (sct,1) or triangle (sct,2).
The scan starts with "ss,1". During a scan, the status can be requested with "ss<CR>". The answer
"ss,2" means the scan is still running, and "ss,0" indicates the scan is complete. A running scan be
aborted by setting the status to zero (ss,0<CR>).
Geschäftsführer: Dr. Bernt Götz • Telefon 03641/66880 • Fax 03641/668866 • www.piezojena.com
74
unit µm or mrad
unit µm or mrad
unit µm or mrad
0: trigger disabled
1: trigger at rising edge
2: trigger at falling edge
3: trigger at both edges
(n*20 µs n=1...255)
table 13: commands for trigger generation