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Subsections

B.1 Temperature Sensors

Detector Temperature  

To convert ERD voltage to actual detector temperature one should apply the following relationship:

\begin{displaymath} T = B \frac {1} {~^{10}{\rm log}(R_s)+ {\frac {K} {~^{10}{\rm log}(R_s)}} - A}~~~~~~~(K)\end{displaymath} (B.1)

where: 


A, B, K = constants, different for each detector
Rs = sensor resistance in $\Omega$, according to

\begin{displaymath} {\rm \frac{R_s}{1000} = \frac{1}{\frac{1}{C_1 {\times} tmd - C_2}-\frac{1}{R_p}} -R_k}~~~~~~~~(\Omega)\end{displaymath} (B.2)

Where: 


tmd	= telemetry data value
C1, C2	= constants
Rk 	= harness resistance in k$\Omega$
Rp 	= EEU shunt resistor in parallel to sensor in k$\Omega$

Sensor A B K
FCS1 6.54 2.90 10.67
FCS2 6.54 2.90 10.67
C100 5.44 3.05 7.34
C200 4.51 3.12 4.92
P1 6.02 3.61 8.77
P2 7.59 3.13 14.40
P3 5.11 3.49 6.29
S1 6.54 2.94 10.66
S2 6.54 2.90 10.67

Sensor $C_1 (k{\Omega}$ $C_2 (k{\Omega}$ $R_k (k{\Omega}$ $R_p (k{\Omega}$
FCS1 0.259 495.83 1.12 1000
FCS2 0.256 495.83 1.12 1000
C100 0.099 146.38 1.34 infinite
C200 0.048 -78.32 0.67 infinite
P1 0.174 344.55 1.12 499
P2 0.210 388.13 1.34 499
P3 0.182 288.11 1.34 infinite
S1 0.173 341.63 1.12 499
S2 0.170 336.88 1.12 499

EEU temperature  

\begin{displaymath} T = \frac{B}{A+ln(R_s)} ~~~~~~~~~~~~~~~~~~(K)\end{displaymath} (B.3)

with

\begin{displaymath} R_s = \frac{tmd-2048}{4096-tmd} \times 7500~~~~~~~~~~~~~~~~~~~(\Omega)\end{displaymath} (B.4)

where 


A 	= 3.9489
B 	= 3442 K
Rs	= sensor resistance in $\Omega$
T 	= EEU Temperature in K
tmd 	= telemetry data value
next up previous contents
Next: B.2 Selected FCS Power Up: B Conversion Algorithms for Previous: B Conversion Algorithms for

ISOPHOT Data Users Manual, Version 4.1, SAI/95-220/Dc