Table of Contents:
Relevant Devices
Description | Qty | Source | Part Number | |
|---|---|---|---|---|
Lamp Intensity Monitor Controller | 1 | Newport | 1830-R-GPIB | |
Lamp Intensity Monitor Detector | 1 | Newport | 818-SL/DB | |
RS-232 to Ethernet Adapter | 1 | Lantronix | UDS2100 | This is the version with two serial ports (and standard 9-pin RS-232 connectors) |
Relevant Functional Block Diagram
Most recent version. Going forward, lamp intensity monitor and its connections are not expected to change.
Software Actions
Action | Notes | |
|---|---|---|
| 1 | Single measurement. | That is, report the Wattage value the detector is currently reporting. Note calibration unit translation stage has to move detector into beam first. |
| 2 | Calculate average of ‘n' discrete single measurements taken ’t' seconds apart. | Average several single measurements together to smooth out measurement noise/detector variability. This value reported as telemetry (see below). This approach was used for measurements at SSL using a similar device; see example Python code at bottom of this page. |
Required Adjustable Settings
NOTE: device automatically switches from “LOCAL” to “REMOTE” mode when it receives a remote command through either the USB, RS-232C, or IEEE 488 GPIB interfaces.
Setting | When Needed | Notes | ||
|---|---|---|---|---|
Build | Observing | Maintenance | ||
Number of measurements 'n' to include in average. | YES | NO | MAYBE | Perhaps start with 10 |
Time delay 't' between measurements used for average. | YES | NO | MAYBE | Perhaps start with 0.5 seconds. |
Device setup parameters follow: | ||||
Set offset subtraction | YES | NO | MAYBE | Equivalent to “ZERO” button on device. KPF default should be ‘Z0’ (no offset subtraction). |
Set calibration wavelength | YES | NO | MAYBE | Equivalent to wavelength buttons on device. KPF default value should be 658 nm. Remote command might be 'W0658'. |
Set attenuator mode | YES | NO | MAYBE | “ATTN” button on device. KPF default should be set to ‘off’ (i.e. no attenuator in place). Remote command is ‘A0’ |
Set measurement units | YES | NO | MAYBE | Equivalent to “UNITS” button on device. KPF default should be Watts (remote command ‘U1'). |
Set averaging mode | YES | NO | MAYBE | Equivalent to “AVG” button on device. KPF default should be set to ‘Fast’ mode (no averaging by device). Remote command for ‘Fast’ mode is ‘F3’. |
Set audible beep on/off | YES | NO | MAYBE | Equivalent to “BEEP” button on device. KPF default should be ‘off’ (remote command ‘B0’) |
Set automatic range | YES | NO | MAYBE | Equivalent to “AUTO” range on device. KPF default should be auto-range (remote command ‘R0’). |
Turn display on/off | YES | NO | MAYBE | KPF default should be ‘off’ (remote command ‘K0’). Likely device produces less heat (and isn’t a light source) with the display off. |
Local lockout | YES | NO | MAYBE | I presume KPF default should be ‘locked’ while under remote operation (remote command ‘L1’) |
Required Telemetry
Parameter | Report Frequency | Purpose | Notes | |
|---|---|---|---|---|
| 1 | Source 1 intensity | TBC | Monitor calibration source outputs over time | Report this value if Source 1 is selected at octagon. |
| 2 | Source 2 intensity | TBC | Report this value if Source 2 is selected at octagon. | |
| 3 | Source 3 intensity | TBC | Report this value if Source 3 is selected at octagon. | |
| 4 | Source 4 intensity | TBC | Report this value if Source 4 is selected at octagon. | |
| 5 | Source 5 intensity | TBC | Report this value if Source 5 is selected at octagon. | |
| 6 | Source 6 intensity | TBC | Report this value if Source 6 is selected at octagon. | |
| 7 | Source 7 intensity | TBC | Report this value if Source 7 is selected at octagon. | |
| 8 | Source 8 intensity | TBC | Report this value if Source 8 is selected at octagon. |
Required Alarms
Parameter | Threshold | Notes | |
|---|---|---|---|
| 1 | Calibration Source 1 intensity low | TBD | |
| 2 | Calibration Source 2 intensity low | TBD | |
| 3 | Calibration Source 3 intensity low | TBD | |
| 4 | Calibration Source 4 intensity low | TBD | |
| 5 | Calibration Source 5 intensity low | TBD | |
| 6 | Calibration Source 6 intensity low | TBD | |
| 7 | Calibration Source 7 intensity low | TBD | |
| 8 | Calibration Source 8 intensity low | TBD |
Relevant Datasheets & Manuals
Description | File | Source | |
|---|---|---|---|
| 1 | 1830-R-GPIB Quick Start | ||
| 2 | 1830-R-GPIB Manual | ||
| 3 | Controller Computer Interface Software | ||
| 4 | Controller Firmware | ||
| 5 | 818-SL/DB Detector Manual | ||
| 6 | Lantronix UDS 2100 Quick Start Guide | https://www.lantronix.com/products/uds2100/#tab-docs-downloads | |
| 7 | Lantronix UDS 2100 User Guide |
Relevant Software
Description | Files | Notes |
|---|---|---|
Example python code from VPH measurement system at SSL. Written for a Newport 1936-C intensity meter, which perhaps uses similar code to the KPF intensity meter (Newport 1830-R-GPIB) |
Dispatcher Implementation
Keyword | Value | Type |
|---|---|---|
CALMON_POW | Power measured by detector every time delay (see above) | Double - read only |
CALMON_AVGPOW | Power measured by detector averaged over a number of steps specified in NAVG | Double - read only |
CALMON_AVGTIME | Time stamp of last average measurement | Time in ascii format or unix timestamp in binary format - read only |
CALMON_NAVG | Number of POW measurements to average to compute AVGPOW. Dispatcher requires > 1. | Integer - writable as as well readable, default set in configuration file |
CALMON_AVG | Averaging is on or off. | Boolean |
CALMON_CONN | Connection on or off to the device | Boolean |
CALMON_IP | IP address of the Lantronix | String - read only but set in configuration file. |
CALMON_PORT | Port id on the Lantronix for the serial connection | String - read only but set in configuration file. |
CALMON_ID | ID string returned by device. Only valid when there is a connection. | String - read only. |
CALMON_ATT | Attenuator on / off | Enum - 0 Off - 1 On |
CALMON_BEEP | Device Beep on / off | Enum - 0 Off - 1 On |
CALMON_DISPLAY | Front panel display on / off | Enum - 0 Off - 1 On |
CALMON_FILTER | Averaging on the device | Enum - 1 Slow (16) - 2 Medium (4) - 3 Fast (1 or no averaging) |
CALMON_LOCK | Front paneled locked remotely, on locks | Enum - 0 Off - 1 On |
CALMON_RANGE | The device does automatic scaling of the output (0) or has eight preset ranges | Enum - 0 Auto - 1 2 3 4 5 6 7 8 |
CALMON_UNITS | The output units of the power measurement. Can be relative (REL) to a previous value. | Enum - 1 Watts - 2 dB - 3 dBm - 4 REL |
CALMON_ZERO | Use a previous value as a zero point, can be turned on or off. | Enum - 0 Off - 1 On |
CALMON_WAVE | Wavelength of light used for the detector calibration, specified in nanometers. | Integer - dispatcher enforces range between 0 and 2000 |
DISPSTA | Dispatcher status. | Enum and read only. If value is 4 or “Not Connected” the connection to the Vaisala or the Lantonix is not available. If value is 3 or “Connecting” the dispatcher is attempting to connect to the Vaisala through the Lantronix. |
Configuration | Value | Explanation |
|---|---|---|
ip | 192.168.23.102 | IP address of the Lantronix |
port | 10002 | Port that is used, 10002 means port 2 |
poll_time | 0.5 | Time between data requests for the measured power value. |
navg | 10 | Default starting value for NAVG. Keyword can be written. |
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