Measurement Computing LogBook Series - Manual (Page 159)

Software Reference 989592 LogView LV-33
Analog Input Channel Configuration, 2-Point Cal Tab Selected
Calibration. The above figure shows the columns in the 2-Point Calibration tab. To fine tune the
accuracy of the value coming from a linear sensor, LogView provides both 1- and 2-point calibration.
One-point calibration can be used to zero a channel—as in a thermocouple, which is usually more
accurate in scale than offset. You might place the thermocouple in an ice bath and set just the 0°C point.
2-point calibration determines the scale and offset factors to convert the raw readings into accurate
calibrated readings. 2 points, of known (set) value, must be compared with 2 sensor (actual) readings.
For example, to calibrate a strain-gage scale, unload the scale, type 0.0 into the Set P1 column, then click
the Get P1 button to read the actual sensor value (2.0). Place a known 100 lb weight on the
scale; type 100 into the Set P2 column; then click the Get P2 button to read the actual sensor
value (95.0). LogView automatically computes the Cal Offset factor (near 0) and Cal Scale factor (near
1). From now on, LogView automatically applies the y = mx + b calculation to the incoming reading to
produce the calibrated reading.