Apogee SI-431 Instrukcja obsługi - Strona 6

Przeglądaj online lub pobierz pdf Instrukcja obsługi dla Przyrządy pomiarowe Apogee SI-431. Apogee SI-431 20 stron. Infrared radiometer
Również dla Apogee SI-431: Instrukcja obsługi (20 strony), Instrukcja obsługi (20 strony)

Drukuj stronę

SPECIFICATIONS

Input Voltage Requirement

Current Drain

Calibration Uncertainty (-20 to 65 C),

when target and detector temperature are

within 20 C

Calibration Uncertainty (-40 to 80 C),

when target and detector temperate are

different by more than 20 C

(see Calibration Traceability below)

Measurement Repeatability

Stability (Long-term Drift)

Response Time

Field of View

Spectral Range

Operating Environment

Dimensions

Mass

Cable

Calibration Traceability

Apogee SI series infrared radiometers are calibrated to the temperature of a custom blackbody cone held at

multiple fixed temperatures over a range of radiometer (detector/sensor body) temperatures. The temperature of

the blackbody cone is measured with replicate precision thermistors thermally bonded to the cone surface. The

precision thermistors are calibrated for absolute temperature measurement against a platinum resistance

thermometer (PRT) in a constant temperature bath. The PRT calibration is directly traceable to the NIST.

Spectral Response

SI-411

SI-421

0.6 mA (quiescent),1.3 mA (active)

0.2 C

0.5 C

less than 2 % change in slope per year when germanium filter is maintained in a

clean condition (see Maintenance and Recalibration section below)

0.6 s, time for detector signal to reach 95 % following a step change; fastest data

transmission rate for SDI-12 circuitry is 1 s

22º half angle

18º half angle

8 to 14 µm; atmospheric window (see Spectral Response below)

-45 to 80 C; 0 to 100 % relative humidity (non-condensing)

23 mm diameter; 60 mm length

190 g (with 5m of lead wire)

5 m of two conductor, shielded, twisted-pair wire; additional cable available in

multiples of 5 m; santoprene rubber jacket (high water resistance, high UV stability,

flexibility in cold conditions); pigtail lead wires

Spectral response of SI series infrared

radiometers. Spectral response (green line) is

determined by the germanium filter and

corresponds closely to the atmospheric window

of 8-14 µm, minimizing interference from

atmospheric absorption/emission bands (blue

line) below 8 µm and above 14 µm. Typical

terrestrial surfaces have temperatures that yield

maximum radiation emission within the

atmospheric window, as shown by the blackbody

curve for a radiator at 28 C (red line).

SI-431

5.5 to 24 V DC

0.3 C

0.6 C

less than 0.05 C

14º half angle

SI-4H1

0.2 C

0.5 C

32º horizontal half

angle; 13º vertical

half angle