Ca HK Shutter Controller

Table of Contents:

Introduction

A Uniblitz VED24 shutter controller is located within the AO Rack, and it controls a Uniblitz DSS25B bi-stable shutter within the Ca HK spectrometer enclosure.

The trigger signal used to open and close the shutter is generated by the Ca HK Galil Controller.

Relevant Devices

Description	Qty	Source	Part Number	Notes
Shutter Controller	4	Uniblitz	VED24
Shutter	4	Uniblitz	DSS25B1T0	25mm Optical Shutter Bi-stable (only requires power for transitions) Ordering options:

Relevant Functional Block Diagram

Complete Ca H&K Spectrometer electronics schematic (shutter controller is near the top right):

Cable Details

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:

The function switch has the following settings:

For the DSS25B shutters the function switch and pulse duration settings are:

Note 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 also 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.’. Each KPF VED24 has a label on the front to indicate this, as show in the picture above.

To manually operate a shutter, one can click the N.O./N.C. switch back and forth. However, be sure to leave it at ‘N.O.’ when done.

Two cables are needed to connect the VED24 and the DSS25B shutter, as shown in the photo of Ashley’s lab setup below.

Relevant Datasheets & Manuals