User guide

Veloce 50 Operating Manual
1
7
APPENDIX A COMMUNICATION VIA RS-232 PORT
8.1.1 CONVERSION FROM VOLTAGE TO DEGREES CELCIUS
The temperature is obtained by multiplying the analog output span (AP
f
), the voltage output (mV) and the
calibration factor (CF).
ΔT = CF
*
AP
f
*
ΔV
Variable Example Sources
CF
1.012
o
C/nm
*
Note1
Calibration Factor, written on each sensor box.
AP
f
0.01 nm/mV *
Note1
Analog Span
f
, stored in the conditioner memory.
ΔV 3000 mV
Voltage output, measured by the user at the
conditioner front panel (Analog output).
ΔT 30.36
o
C
*Note1: «nm» stands for nanometers, which are FISO Technologies internal units. By multiplying CF and
AP together the nanometers units cancel out to leave an
o
C/mV scale factor.
Each of Fiso fiber optic temperature transducer is delivered with a Calibration Factor designated both on
the storage box and on the calibration sheet. The Calibration Factor of each probe can be retraced using
the serial number affix on the connector which also appears on the storage box and calibration sheet.
By default, the Veloce voltage output span (AP
f
) is scaled at 0.01nm/mV.
8.1.2 ADJUSTABLE
PARAMETERS (REMOTE CONTROL)
Parameters of importance like signal averaging and voltage output span can be modified remotely via the
RS-232 port. Other functions like resetting the system and getting access to the versions of hardware,
software and calibration date are also accessible remotely.
8.1.2.1 Voltage output span
The analog output span can be adjusted to meet the dynamic range required to resolve both small and
large temperature variations. The span is defined as the total cavity length change per 5Volts. By default,
the span is set at 50nm/5V. Considering the probes sensitivity is of about 1 nm/
o
C, the system will be able
to measure a temperature change limited to 50
o
C. The command [APXXXXX] is used to adjust the span,
where XXXXX is the total cavity length change per 5V.