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

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: Open

Relevant Functional Block Diagram

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

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Cable Details

Photos of Devices

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The HK spectrometer shutter VED24 within the AO Rack, zip-tied to the wall of the rack.. The power supply for the VED24 sits to its left.

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:

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Front face of a KPF VED24 controller.

The function switch has the following settings:

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

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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.

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The HK shutter system in the lab. The VED24 is at the top left. There are two shutter cables required; the first is the black 510F cable (with 5-pin Switchcraft connectors) and the second is the red-and-black 5M203D cable that goes between a Switchcraft connector and the 2-pin flex cable connector on the shutter (shown within a lab-test mounting on the front of the Newton 920 HK Spectrometer detector).

Relevant Datasheets & Manuals

	Description	File	Source

	Description	File	Source
1	Uniblitz VED24 Controller Datasheet	Open	VED24 Shutter Driver
2	Uniblitz VED24 Controller Manual	Open
3	Uniblitz DSS25B Shutter Datasheet	Open	DSS25B 25mm Optical Shutter
4	Uniblitz DSS25B Shutter Solid Model	Open