Calibration Bench Shutter Controllers
- Steve Gibson
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).
The shutter trigger pulses are generated by the Shutters and Timing Galil.
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
Cable Details
Cable | Qty | Details |
|---|---|---|
Cal. Unit. Sci/Sky Arm Shutter (BNC) | 1 | |
Cal Unit Simultaneous Cal Shutter (BNC) | 1 | |
SoCal Sci Fiber Shutter (BNC) | 1 | |
SoCal Cal Fiber Shutter (BNC) | 1 | |
Uniblitz-Supplied 510F Cable | 4 | Ships with Uniblitz VED24 Shutter Controller |
Uniblitz-Supplied 5M203D Cable | 4 | Ships with Uniblitz VED24 Shutter Controller |
Photos of Devices
Installation Instructions
The settings below must only be used for the DSS25B shutter, or damage will result. |
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 settngs:
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 VED 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.
Relevant Datasheets & Manuals
Description | File | Source | |
|---|---|---|---|
| 1 | Uniblitz VED24 Controller Datasheet |  | |
| 2 | Uniblitz VED24 Controller Manual
|  | |
| 3 | Uniblitz DSS25B Shutter Datasheet |  | |
| 4 | Uniblitz DSS25B Shutter Solid Model
|  |