Thermo Scientific ThermoFlex Manual De Instrucciones página 197

Appendix D
The following values are the factory defaults for the millivolt setting that will effectively yield 10mv/°C:
MilliVolts (10mv/°C)
High mv
Low mv
High temp
Low temp
Millivolts
With highlighted press enter to display:
USER MV
High MV
Low MV
High Temp
Low Temp
These values are used to calculate a gain and offset and are applied to the set point input voltage.
MilliVoltInputGain = (high temp – low temp) / (high mv – low mv)
MilliVoltInputOffset = high temp – (high mv * MilliVoltInputGain)
So that the default settings will yield the following gain and offset for set point input:
Now 100mv will yield a set point of 10° ( (100 * gain) + offset))
Just like voltage the mv range can be set for other ranges.
A separate gain and offset will also be calculated and are applied to the DAC temperature output value.
So that the default settings will yield the following gain and offset for temperature output.
Now 10° will output 100mv ((10 * gain) + offset)
D-6 ThermoFlex
1000.0mv
0.0mv
100.0°
0.0°
1000.0
0.0
100.0
0.0
MilliVoltInputGain = (100 – 0) / (1000 – 0) = 0.1
MilliVoltInputOffset = 100 – (1000 * 0.1) = 0
(100mv * 0.1) + 0 = 10.0° = 10mv/°C
MilliVoltOutputGain = (high mv – low mv) / (high temp – low temp)
MiliVoltOutputOffset = high mv – (high temp * MilliVoltOutputGain)
MilliVoltOutputGain = (1000 – 0mv) / (100 – 0) = 10
MilliVoltOutputOffse = 1000 – (100 * 10) = 0
(10° * 10) + 0 = 100mv = 10mv/°C
Highlight the desired value and then press enter, the high-
light will flash. Use the up and down arrows to change the
value. Once the desired value is displayed press enter to
accept the change and stop the flashing.
Thermo Scientific