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Table of Contents:
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Page Status
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Date
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Initials
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Change
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May 10, 2021
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SG
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Introduction
Three Lakeshore controllers are used for high precision temperature telemetry within KPF.
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Relevant Devices
Description | Qty | Source | Part Number |
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Green Lakeshore | 1 | Lakeshore | 224-12 |
Red Lakeshore | 1 | Lakeshore | 224-12 |
Spectrometer Lakeshore | 1 | Lakeshore | 224-12 |
RTD Sensors | 36 | Honeywell | Honeywell PN: HRTS-5760-B-U-1-12 |
NOTE: we have two three identical devices (“Spectrometer Lakeshore” and “Cryostats Lakeshore”). The only difference in the control software between the two will be the look-up table which maps the Lakeshore sensor input names (i.e. ‘C1’) to physical sensor locations within KPF (i.e. ‘Echelle’).. The same KTL dispatcher is used for all three, however each device has a its own configuration file as described within the “Dispatcher Configuration File” section below.
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Relevant Functional Block Diagram
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Spectrometer Lakeshore shown; Cyrostats Lakeshore is the same except the temperature sensors go to the cyrostats.
Software Actions
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The three Lakeshores will be set up the same, with sensors placed within (or around) the vacuum chamber. The temperature sensor cable details differ depending on where the sensors are placed, see “Installation Details and Sensor Locations” table below for more details.
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Installation Details and Sensor Locations
Description | File | Notes | |
|---|---|---|---|
| 1 |
Read 12 temperature values
Installation details and sensor locations | ||
| 2 | ||
Required Adjustable Settings
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Setting
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When Needed
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Notes
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Build
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Observing
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Maintenance
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Temperature measurement frequency
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Yes
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No
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Maybe
Device Set-up Parameters
Annotated command list with KPF settings.
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Input B Temperature [deg C]
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Input C1 Temperature [deg C]
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Input C2 Temperature [deg C]
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Input C3 Temperature [deg C]
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Input C4 Temperature [deg C]
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Input C5 Temperature [deg C]
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Input D1 Temperature [deg C]
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Input D2 Temperature [deg C]
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Input D3 Temperature [deg C]
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Input D4 Temperature [deg C]
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Input D5 Temperature [deg C]
Lakeshore Input Names/KPF Location Look-up Tables
Spectrometer Lakeshore - 192.168.23.181
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Lakeshore Input
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KPF Location
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Notes
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A
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TBC
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B
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TBC
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C1
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TBC
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C2
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TBC
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C3
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TBC
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C4
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TBC
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C5
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TBC
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D1
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TBC
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D2
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TBC
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D3
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TBC
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D4
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TBC
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D5
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TBC
Cryostats Lakeshore - 192.168.23.184
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Lakeshore Input
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KPF Location
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Notes
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A
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TBC
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B
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TBC
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C1
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TBC
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C2
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TBC
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C3
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TBC
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C4
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TBC
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C5
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TBC
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D1
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TBC
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D2
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TBC
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D3
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TBC
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D4
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TBC
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D5
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TBC
Required Alarms
Parameter
Threshold
Notes
Interconnection Diagram |  | ||||
| 3 | Sensor cable harness fabrication details |
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Required Telemetry
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Parameter
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Report Frequency
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Purpose
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Notes
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Input A Temperature [deg C]
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Once every 5 sec [TBC]
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Environmental monitoring
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| 4 | Cable details between Lakeshores and vacuum chamber | ||
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Relevant Datasheets & Manuals
Description | File | Source | |||||
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| 1 | Device Manual |
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| 2 | Rack Mounting Instructions |
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Relevant Software
Description
File
Source
Python code that sets up a Lakeshore 224 with KPF settings.
| View file | ||
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Written by S. Gibson for tests at SSL.
| 3 | RTD Sensor Datasheet |
Covers many sensors, the part number of the sensor KPF uses is: HRTS-5760-B-U-1-12. | DigiKey download. |
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Dispatcher Configuration File
Each Lakeshore has a unique name, noted as $(NAME). Currently the names are green and red but that can easily change. That name is used to denote details about the connections.
Each sensor has a unique name, noted as $(sensor). That name is set by the configuration file. The keyword for the sensor is set by the sensor name. The units, data type, and display format are also all defined in the configuration file.
Note, beyond the blocks device and dispatcher each sensor needs its own block. That block named by the sensor name, so, A, B, C1, etc.
Configuration | Value | Explanation |
|---|---|---|
address | 192.168.23.181 | IP address of the Lakeshore |
port | 7777 | port for connecting to the Lakeshore |
poll_time | 5 | Time in seconds between queries |
model | MODEL224 | Model number for the device, must in the return string when the model is queried |
name | green | Prefix of name, corresponds to which Lakeshore (could be removed) |
dispnum | 2 | Dispatcher number. |
name | sensor | Name of the sensor, must be in a block labeled by the internal sensor name (e.g., A, B, C2, etc.) |
type | double | The data type of the value |
format | %.3f | The ASCII format used for showing the data via KTL. The full data as returned by the device will be stored in the binary format. |
unit | deg C | The units of the temperature. The options that actually make sense are deg C and deg K. There is no enforcement of that here but this only impacts the displayed values, it does not change the query made to the device (which can be K or C.) |