190-01115-01
G3X/G3X Touch Install Manual - GDU 4XX Config and Post Install Checkout
Rev. AC
Page 34-153
34.4.26.15.1 Current Calibration
The two electrical current inputs can be calibrated (if desired) as detailed below.
Scale Factor – Either Multiplier or milliVolts per Amp (mV/Amp) can be selected, For most installations,
the Multiplier setting will remain set to the default (1.00) value. A typical use for the Multiplier setting is
for a Hall Effect current sensor that has the current-carrying conductor looped through the sensor twice; in
that case the scale factor should be set to 0.50 to give the correct current reading. The mV/Amp setting is
useful when using a current sensor (either shunt or Hall effect) where the sensor response is specified in
mV/A.
Amps Offset
–
The Amps Offset calibration can be performed to compensate for any residual current
readings that cannot be “zero’ed out”. For example, if the Amps gauge reads +0.2 Amps, with no current
being drawn, an Amps Offset of -0.2 can be entered and saved, thus correcting the Amps gauge reading to
0.0 Amps. If no compensation is needed, calibration is not necessary and the default value of 0.0 will be
used. This setting is most commonly used with Hall effect current sensors because of the inherent
variability of some of these type sensors.
Zero Deadband
–
Sets a range of values that will be displayed as zero on the gauge. In the example shown
in the following screenshot, any readings from -0.5 to +0.5 will be displayed as zero.
Sensor Value – Displays the actual or ‘raw’ current value as measured by the sensor.
Calibrated Amps – Value shown will be displayed on current gauge. This value is derived from the Sensor
Value plus any adjustments made by the Scale Factor, Amps Offset, and Zero Deadband settings. The
measured current is first multiplied by the scale factor, then the offset value is added. If the resulting
current value is less than the deadband value, the displayed current will be zero.
