Repetition Rates And Duty Cycle; Controller; Principles Of Operation; Rear Panel Connectors - Sutter Instrument LAMBDA 10-B Operation Manual

1.5.3.3 Repetition Rates and Duty Cycle

Operation does not require over-driving the motor windings, so the motor windings are not
damaged by frequent opening and closing over long time periods. 25 mm (one inch) versions
can usually operate well at up to 20 Hz. 35 mm versions can usually operate well at up to 15
Hz. These shutters may be operated at higher rates up to 40 Hz, but there will normally be
specific frequencies in the higher ranges that will produce errors in motion of the shutter
blade. This is the result of resonances in the mechanical and electrical systems.
If the duty cycle is substantially different from 50%, errors in movement may occur at lower
frequencies. At 40 Hz, the cycle time is 25 msec., with 12.5 msec. between open and close
commands. This is close to the absolute minimum time in either the open or closed state. If
you attempt to reduce the time in either state below 12 msec, the controller will not start to
change the shutter state until the 12-msec minimum period is over.

1.6 Controller

1.6.1 Principles of Operation

The LAMBDA 10-B controller can be operated locally (manually) from the controller keypad
or remotely from a computer either through the serial or USB port. These operational modes
(manual, USB, and serial) are functionally identical. Each allows the user to select:
Filter Wheel
◼
Filter position
◼
Filter switching speed
◼
Shutter position
◼
Shutter mode
◼
The remainder of this chapter provides a detailed description of the controller's rear panel
connectors and front panel controls. Information needed to connect the power cord and filter
wheel(s) is found in the FIRST TIME USE chapter. Instructions on operation of the
controller and manual keypad control of the filter wheel(s) are presented in the MANUAL
CONTROL chapter. The REMOTE-CONTROL chapter explains control of the unit from a
remote device, as well as supplying some technical details relevant to local operation.
Technical details, which are not required for operation, but which may help you understand
the behavior of the unit, are found in APPENDIX A: Stepping Motor Operation.

1.6.2 Rear Panel Connectors

All electrical connections are all made on the rear panel of the LAMBDA 10-B. See the FIRST
TIME USE chapter for details on connecting the power cord and filter wheel cable(s).
LAMBDA 10-B OPERATION MANUAL – REV. 1.20Q (20230227)
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