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## Introduction
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## Introduction
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This is a simple design for a UV-meter. It uses as much as possible
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This is a simple design for a handheld wideband UV-meter.
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ready-made components and will need a minimum amount of soldering.
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It uses as much as possible ready-made components and will need a
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minimum amount of soldering.
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It fully complies to the requirements, but will only need a sticker over
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It fully complies to the requirements, but will only need a sticker over
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the rightmost digit to show in mMED/hr.
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the rightmost digit to show in mMED/hr.
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... | @@ -17,20 +18,9 @@ the rightmost digit to show in mMED/hr. |
... | @@ -17,20 +18,9 @@ the rightmost digit to show in mMED/hr. |
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- Can be customised with [full colour
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- Can be customised with [full colour
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printing](http://www.serpac.com/printing.aspx)
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printing](http://www.serpac.com/printing.aspx)
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Alternatively (but too large):
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- Serpac [H659V - Handheld 9V Remote Electronic
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Enclosure](http://www.serpac.com/h659v.aspx)
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- 125.48 mm x 69.85 mm x 23.98 mm
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- [Farnell/USA
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stock](https://fr.farnell.com/serpac/h-65-9v-bk/enclosure-hand-held-plastic-black/dp/9254935)
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\< 10 Euro
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- A cool yellow protection exists: Serpac [H65 Shock Absorbing
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Boot](http://www.serpac.com/H65-Boot.aspx)
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Design
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Design
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- Need cutouts for display, pushbutton, sensor, hole for calibration
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- Cutouts for display, pushbutton, sensor, hole for calibration
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- Printed customisation by factory or with sticker
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- Printed customisation by factory or with sticker
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-----
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... | @@ -39,9 +29,9 @@ Design |
... | @@ -39,9 +29,9 @@ Design |
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- Murata [31⁄2 Digit, LCD Display Digital Panel Voltmeter
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- Murata [31⁄2 Digit, LCD Display Digital Panel Voltmeter
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DMS-20lcd-1-9-c](https://www.murata-ps.com/datasheet?/data/meters/20lcd.pdf)
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DMS-20lcd-1-9-c](https://www.murata-ps.com/datasheet?/data/meters/20lcd.pdf)
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- 2V full range
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- 2V full range, auto-zero
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- Auto-zero, full-scale calibration with
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- Full-scale fine calibration with screwdriver (only ±50 counts or
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screwdriver
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±2.5%)
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- [Arrow](https://www.arrow.com/en/products/dms-20lcd-1-9-c/murata-power-solutions)
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- [Arrow](https://www.arrow.com/en/products/dms-20lcd-1-9-c/murata-power-solutions)
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- [DMS Application note 3: Analog Common and Reference
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- [DMS Application note 3: Analog Common and Reference
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... | @@ -55,32 +45,65 @@ Design |
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sensor](https://sglux.de/en/product-category/sic-uv-tocons/broadband-tocons/)
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sensor](https://sglux.de/en/product-category/sic-uv-tocons/broadband-tocons/)
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- [TOCON\_ABC5](https://sglux.de/en/product/tocon_abc5-en/)
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- [TOCON\_ABC5](https://sglux.de/en/product/tocon_abc5-en/)
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- Gives 0-5V output
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- Gives 0-5V output
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- "Scatter" (tolerance) of ±20%. Should be able to calibrate this
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out.
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- See [sglux FAQ](https://sglux.de/en/faq): *What about the
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TOCON scatter?*
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- Lower and higher sensitive sensors exist
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- Lower and higher sensitive sensors exist
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Not needed: digital calibration could be made with a [TOCON Adjustment
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Likely not needed: digital calibration could be made with a [TOCON
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board](https://sglux.de/en/product/tocon-adjustment-board/)
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Adjustment board](https://sglux.de/en/product/tocon-adjustment-board/)
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(needs specific box to make setting).
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-----
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### Printed Circuit Board
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### Printed Circuit Board
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- Holds
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- Holds
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- TOCON (via additional board?)
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- TOCON
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- Needs to be mounted at 90 degrees as on front-side of box.
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****\*\*Needs an additional board?
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- Ask sglux if TOCON can come with wires or a low-cost
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connector allowing assembly at 90 degrees
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- Push button (height should be right)
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- Wires up to 9V holder
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- Display/voltmeter
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- Display/voltmeter
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- Needs careful adjustment in height, or with socket that
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- Needs careful adjustment in height, or with socket that
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allows movement? Or wire the display up to the PCB?
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allows movement? Or wire the display up to the PCB?
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- Allow for hole to reach calibration screw
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- Allow for hole to reach calibration screw
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- Resistors for the full-scale adaptation from 0-5V to 0-2V (1%
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- Resistors for the full-scale adaptation from 0-5V to 0-2V (1%
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metal-film)
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metal-film)
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- Final calibration on Display/Voltmeter
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- Tolerance of TOCON ±20%. Should be able to handle this.
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- Push button (height should be right)
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- Use high-precision potentiometer?
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- Wires up to 9V holder
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- Use selectable resistors?
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- Use a digital potentiometer or sglux setting
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board/schematics (requires programming with special box
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and connector)
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- Final fine (±50 counts or ±2.5%) calibration on
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Display/Voltmeter
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### Various
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### Various
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- 9V battery
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- 9V battery
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- Assembly: mask off the rightmost digit with tape or a dedicated
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sticker
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### Questions
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sglux
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1. TOCON can come with wires or a low-cost connector allowing assembly
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at 90 degrees?
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2. What is on the settings board? Digital potentiometer? Schematics
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available?
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Other
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1. Can TOCON be mounted on tilted top part of box?
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-----
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