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General| Measurement range, relative humidity | 0 to 100 %RH |
|---|---|
| Operating Temperature | -40 to +60 °C |
| Protection Class | IP65 |
| Supply voltage | 10 to 35 VDC |
| Output | 4 to 20 mA |
| Resolution | 0.1 %RH |
| Measurement range, temperature | -40 to +60 °C |
Provides general notes about the manual and the product.
Lists other relevant Vaisala documentation for the system.
Contact information for user comments and technical assistance.
Covers important safety considerations, recycling, and product trademarks.
Outlines the terms and conditions for software usage.
Describes the basic RDF wind finding system and its components.
Initial setup and prerequisites before operating the system.
Detailed steps for performing a standard sounding with RT20A.
Explains the PTU and RDF status displays during operation.
Procedures for releasing the radiosonde balloon and initial observations.
Monitoring data and sending messages during the sounding.
Procedures for both automatic and manual termination of the sounding.
Introduces the RTH21 terminal, its functions, and physical characteristics.
Explains Angle, Phase, and Tune display modes for monitoring.
Details accessing additional commands and navigating submenus.
Commands for manual antenna positioning, setting home, and zero azimuth.
Covers monitoring tilt, adjusting display/keyboard light, beep, and contrast.
Explains commands for controlling the receiver, setting frequency, and finding signals.
Describes the keypad layout and functions of special operational keys.
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