PRECISE-LOG Data Loggers User’s Manual
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Channel Range
This field specifies the measurement range the channel will use. Different channel types have
different input range selections. Please refer to
Channels and Sensor Connections
chapter
for details.
Description
This field specifies the name or the description of the channel (maximum of 30 characters).
Equation
This field specifies the equation used for the channel. Different channel ranges have different
default equations. Please refer to
Channels and Sensor Connections
chapter for details.
In order to convert a process signal to a correct measurement value an equation must be
applied to the channel.
For example, if you want to use the 0 – 5 VDC channel to record a battery voltage output,
the logger will first convert the battery voltage values to digital values and save them in the
memory. Later when all data are downloaded to a computer, SiteView will use equation
“VoltageDC” to convert the digital values back to voltage values.
If you are recording the voltage output of a transducer or transmitter and the range of the
voltage refers to another measurement unit, you will need to create your own equation for
this conversion. For instance, if your CO2 transducer outputs 0 – 5VDC representing 0 –
5000PPM of CO2, the custom equation you need to create looks like this:
public
double
CO2Equation(
double
Input)
{
double
output;
output = 5000 * Input / 5 ;
return
output;
}
For detailed instructions on how to create a custom equation please refer to the
SiteView
User’s Manual
available for download online.
Cali. Low & Cali. High
These two fields specify the custom calibration values that are used for measurement
adjustment.
Cali. Low value specifies the digital value that is over zero when the input value is in the low
range value (for 0 – 5 VDC channel the low range is zero volt). The equation will subtract
this value from the original digital value when doing the conversion.
Cali. High value specifies the digital value that is over 65535 when the input value is in the
high range value (for 0 – 5VDC channel the high range is 5 volt). The equation will subtract
this value from the original digital value when doing the conversion.
