Digital Data Transmission

The SRS-C34 radiosonde transmits data digitally to the

ground station. A check sum ensures that the measuring

data can not be falsified by transmission errors. Multiple

sondes can work simultaneously due to narrow band

transmission.

GPS

The Meteolabor radiosondes can be equipped with a

high-quality GPS made in Switzerland. These GPS devices

have 16 parallel channels and 8192 search bins to ensure

a short start time. High position accuracy is achieved

even WITHOUT a differential receiver because the receiver

can use correction data from additional satellites

(Satellite-Based Augmentation Systems, SBAS). These

qualities offer you the advantages of low installation costs

and simpler operation. Once the net is in full operation,

the system is ready to use the Galileo Satellites.

Ground System

ARGUS37 is a flexible ground station that can easily be

adjusted to meet the needs of the user. It starts from a

simple, portable research system and can grow to

interlinked systems where the software can receive and

display data at various workstations. For more details on

the ground stations, see the ARGUS37 data sheet.

2) The HC2 sensor is a polymer sensor which is faster

and more accurate than the hygristor.

3) For the most exact measurements of humidity,

SnowWhite® may be used to determine humidity

of the troposphere. SnowWhite® is the only

commercially produced dew point mirror of its

capabilities which can be used with radiosondes.

The sensor is constantly being developed further in

cooperation with customers and research institutes.

For users of radiosondes produced by other

companies, special versions of SnowWhite® are also

available. Please see the ASW35 brochure for

additional information.

Temperature

Meteolabor's temperature sensors are the smallest available on

the market due to our thermo element technique. The

radiation error is reduced to a minimum as the thermometer's

diameter is only 0.1 mm. The deviations between the various

sensors lie within a few thousandths of a degree, therefore

eliminating the need for extensive calibration. The result is a

thermometer with the highest level of accuracy.

Argus 37 ground system

Contact

Meteolabor AG

Hofstrasse 92

CH-8620 Wetzikon

Switzerland

Phone: +41 44 934 40 40

Fax: +41 44 934 40 99

E-Mail: info@meteolabor.ch

Internet: www.meteolabor.ch

© Meteolabor AGAll rights reserved.

Content may change without further notice • 2010-07SRS_C34_e

Pressure

The hypsometer developed by Meteolabor measures

pressure not with a conventional measuring device but

rather with the temperature of boiling water. The

measurement is thus based directly on physical law which

increases the accuracy of the measurement. Unlike other

standard measuring devices, the height accuracy remains

stable throughout the complete measuring range of 0-35

km. Additionally, the accuracy of our hypsometers is

unaffected even in very low pressure, especially in

comparison to other well-known pressure transducers.

Hypsometer

Additional Parameters

Upon request, our radiosondes can be connected to other

sensors (e.g. ozone sensors, IR-spectrometer) through

interfaces. Even your own experiments can be

connected, either through the DC voltage/current inputs

or through digital inputs. A special version enables the

user to access the measuring data during the flight via an

RS232 interface.

Technical Data

Power supply: 8.5...12 V DC with 6 standard alkaline or

lithium batteries, according to application.

Power usage:

Telemetry + transmitter ca. 175 mA

Hypsometer ca. 95 mA

GPS ca. 55 mA

Size: starting from 350 x 210 x 100 mm

Operation time: 180...300 minutes

Weight (including batteries)

Radiosonde 620 g

SnowWhite® Sensor 550 g

Ozone sensor 450 g

Telemetry

Transmitter type PLL Synthesizer

Frequency area 400...406 MHz

Frequency input Per software program

Bandwidth 12 Khz (-3 dB)

Frequency stability < 50 ppm

Frequency shift 5 KHz

Output power 100 mW

Modulation AFSK

Data rate downlink 2400 baud

Measuring cycle variable

GPS Receiver

Number of channels 16

Horizontal accuracy (CEP)1) 2.5 m

Vertical accuracy (SEP)2) 5 m

Cold start time 41 s

GPS Receiver

Sensitivity -140 dBm

Wind velocity

Resolution 0.01 m/s

Accuracy3) 0.12 m/s

Direction of Wind

Resolution 0.1 º

Accuracy3) 2 º

Thermometer

Measuring range -100...+60 ºC

Time constant 1000 hPa < 0.1 s

Time constant 100 hPa < 1 s

Time constant 10 hPa < 1.5 s

Resolution 0.01 ºC

Accuracy 0.1 ºC

Contact

Meteolabor AG

Hofstrasse 92

CH-8620 Wetzikon

Switzerland

Phone: +41 44 934 40 40

Fax: +41 44 934 40 99

E-Mail: info@meteolabor.ch

Internet: www.meteolabor.ch

© Meteolabor AGAll rights reserved.

Content may change without further notice • 2010-07SRS_C34_e

Barometer

Measuring range 5...1100 hPa

Response time < 1 s

Resolution 0.1 hPa

Pressure accuracy 0.2%

Dew Point / Relative humidity

Dew point sensor SnowWhite®

SnowWhite®

Measuring range TP -80...+40 ºC

Relative humidity calculated from TP and T:

Measuring range %RH 2...100%

When detecting oversaturated water: up to...110%

Time constant (1000 hPa, +20 ºC) < 1 s

Time constant (1000 hPa, -40 ºC) < 2 s

Time constant (100 hPa, -40 ºC) < 4 s

Resolution TP 0.1 ºC

Resolution %RH 0.1%RH

Accuracy TP 0.2 ºC

Accuracy %RH 1 %RH

Humidity (with Hygristor)

Sensor type Sippican hygristor

Measuring range 5...100 %RH-20...+40 ºC

Accuracy 2 %RH (rms)

Resolution 1 %RH

Humidity (with HC2 sensor)

Sensor type Polymer

Measuring range 1...100 %RH-40...+50 ºC

Accuracy 1 %RH (rms)

Resolution 0.1 %RH

Ozone Sensor

Ozone Sensor

Sensor type ECC 6 A

Operating range 0...+40 ºC

Accuracy According separatespecifications of ECC

Aerosol Sensor

Sensor type Cobald

Operating range 0...35 km

Accuracy According separatespecifications of ETH Zürich

Input Ports for Additional Sensors

Voltage -4...+1 mV

Accuracy 1 uV

Resolution 0.1 uV

RS232 Input

Voltage 5 V or 3 V TTL

Baud rate 2400...9600 baud

Data rate downlink Up to 20 values/s

1) CEP Circular Error Probability, horizontal positioning error,

radius of a circle with center on the true position, 50% of all

measurements lie within this circle.

2) SEP Spherical Error Probability, spherical positioning error,

radius of a sphere with the center on the true position, 50%

of all measurements lie within this sphere

3) GPS wind velocity and directional accuracy with an

integration time of 3 seconds

Contact

Meteolabor AG

Hofstrasse 92

CH-8620 Wetzikon

Switzerland

Phone: +41 44 934 40 40

Fax: +41 44 934 40 99

E-Mail: info@meteolabor.ch

Internet: www.meteolabor.ch

© Meteolabor AGAll rights reserved.

Content may change without further notice • 2010-07SRS_C34_e

The Most Important Radiosonde Types at a Glance

Pressure

Temperature

Hygristo

r

HC2 Polymer

Sensor

SnowWhite®

Day

SnowWhite®

Night

GPS

Ozone

Order No.

Remarks

x MRS-SRS-C34/012 Temperature sonde

x x x x MRS-SRS-C34/021 RS232 sonde

x (opt) x MRS-SRS-C34/057 TU-GPS sonde

x x (opt) x MRS-SRS-C34/058 PTU-GPS sonde with Hypsometer

x MRS-SRS-C34/063 Wind sonde

x x (opt) x MRS-SRS-C34/059 SW Sonde, night usage

x x (opt) x MRS-SRS-C34/060 SW Sonde, day usage

x (opt) x MRS-SRS-C34/056 Ozone sonde

x x (opt) x MRS-SRS-C34/062 Ozone sonde with Hypsometer

x x (opt) x MRS-SRS-C34/064 SW Sonde, night usage with input for Cobald

x x (opt) x MRS-SRS-C34/055 PTU-GPS sonde with input for Cobald

Additional types are available on request … Additional types

Contact

Meteolabor AG

Hofstrasse 92

CH-8620 Wetzikon

Switzerland

Phone: +41 44 934 40 40

Fax: +41 44 934 40 99

E-Mail: info@meteolabor.ch

Internet: www.meteolabor.ch

© Meteolabor AGAll rights reserved.

Content may change without further notice • 2010-07SRS_C34_e