Sacher Lasertechnik LB2001 - Page 20

Operation Manual LB2001 Sacher Lasertechnik
GmbH
_____________________________________________________________________________________________________
Adress:
Sacher Lasertechnik GmbH
Rudolf-Breitscheid-Str. 1-5
D-35037 Marburg, Germany
Tel.: +49 (6421) 305-0
Fax.: +49 (6421) 305-299
EMail: contact@sacher-laser.com
Web: http://www.sacher-laser.com
Sacher Lasertechnik, LLC
5765 Equador Way
Buena Park, CA 90620, USA
Tel.: 1-714-670-7605
Fax: 1-714-670-7662
Email: sales@sacher-
laser.com
Page 20
Version:
Preliminary 2011-01-01
The PI Filter is fully configured on the front panel with the following elements
Filter Transfer Functions
The filter is specifically designed to have independent control over the three main
parameters that shape the filter frequency response:
• P-I Corner (fPI): This is the 3-dB break frequency beyond which proportional
gain dominates over integral gain.
• Gain (K): This is the amount of proportional gain. The gain can be adjusted
continuously on a log scale. Changing this gain does not alter any of the corner
frequencies of the filter.
• LF Gain Limit (g): This is the gain limit for low frequencies, as measured
from the proportional gain value. The integrator is turned off for frequencies lower than
the following 3-dB corner frequency
For the switch LFGL = 0dB the integral gain is completely turned off (g = 0), and the
filter operates only in proportional mode.
PI Corner adjust
Low Frequency
Gain Limit adjust
Gain Level adjust
PI Filter Parameter
Display
Output Level
Indicator
Filter Mode
switches