MT5 Multi-Tracer Operating Manual
page 32
9.8362 mV at one sun (1000 W/m^2). In this case, the constants would be entered as
shown.
On the other hand, if this constant were given as a single value, such as 9.8362
uV/W/m
^2 (same effective value), the “Converted” value could be set to a value of 1.0
while the “Volts” values could be entered as 9.8362E-6 (9.8362 uV). Alternatively, the
“Converted” value could be entered as shown, or as 1,000,000 (1E6) and the “Volts”
value as 9.8362. In effect, the ratio of these two numbers, for example 1000/0.0098362,
is the slope of the line of the linear conversion.
In addition to scaling, an offset value can also be set. Therefore the complete
conversion equation is a standard linear conversion of the form:
y = m * x + b
In this case:
x = Measured voltage
m = Converted/Volts
b = Offset
Recorded Value = (Measured voltage x Converted/Volts) + Offset
For common inputs, like those from pyranometers, the offset would be 0. However, as
shown above
for the “Temp Sensor”, there is an offset of 25 °C. In this case, the output
changes 1 unit (1 °C) for every 0.01 V (10 mV) of signal change. Therefore the signal
changes 1 °C for every 10 mV of input change. But, with an offset of 25 °C. This means
that if the input signal voltage were 0 mV, the resulting computed value would be 25 °C.
For this signal, the effective conversion equation is:
Recorded Value = (Measured voltage x 1.0/0.010) + 25
Note that the offset is in the converted units and applied after the scaling.
As with all settings pages
, be sure to press the “Apply” button to save any changes.
