Calibration Bench Shutter Controllers

Table of Contents:

Introduction

Five Uniblitz VED24 shutter controllers are located underneath the Calibration Bench, each of which powers and controls a Uniblitz DSS25B bi-stable shutter.

Four of the shutters and controllers are described here. with the fifth described within Flat Field Fiber System (Wide Flat).

The controllers are placed underneath the Calibration Bench to be in close proximity to their shutters: two shutters are placed within the Calibration Unit enclosure (the Cal Sci/Sky Arm and Simult. Cal shutters), and the other two are placed beside the Calibration Unit enclosure (the SoCal Sci Fiber and SoCal Cal Fiber shutters).

Relevant Devices

Relevant Functional Block Diagram

Photos of Devices

Installation Instructions

The shutter controller has a set of DIN “Function Switches” (second from right in image below) and an Octal switch for “Pulse Duration” (far right in image below) that need to be configured for the particular shutter being used:

For the DSS25B shutter which is used with the CaHK system, the settings are:

The setting for Switch 1 does not depend on the shutter type, but should be set to ‘UP’ for ‘LOCAL’ (this disables the USB port and enables the BNC Pulse Input):

Note that there is also a toggle switch on the front that sets the ‘Normally Open’ or ‘Normally Closed’ polarity of the switch (second from left in image above). The manual is not clear on how this affects a bi-stable shutter. For consistency within KPF, all shutter controllers should be set to ‘N.O.’.

To manually operate a shutter, click this switch back and forth. Be sure to leave it at ‘N.O.’ when done.

cables in PN and diagram (same with Galil Enclosure)

For the cable between the VED24 and the DSS25B shutter, it is a Uniblitz SM203D, which ships with the VED24.

picture of NO sticker

Relevant Datasheets & Manuals