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Calibrating analog inputs
With any type of sensor connected to an analog input, either directly to the
ezeio
™
or on one of the expansion modules, calibration may be necessary for
accurate readings.
To calibrate the system you will need two reference points. Ideally these
points should be well separated but within the expected operating range of
the application.
In this example we will calibrate a current sensor, but the procedure is the
same regardless of the type of sensor or unit.
1. Connect the sensor to the ezeio
™
or the expansion unit and make sure we get
a reading of the sensor on the status page in the
raw
column. Do not worry
about setting up the correct type at this point. We will only need the raw
reading.
2. Apply the first reference current to the sensor and let the sensor stabilize.
Current sensor and reference meter, 5.67A
3. When stable, make note of the
raw
reading from the status page, and also
what the reference current is, so in this example we got “1693 at 5.67A”
Status screen, RAW column for input 1 showing “1693”
Page 44 of 121
Содержание AAC
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