Servicing the PT878GC 9-21
April 2004
Calibrating the Analog Output and Inputs
The Calibration option allows you to calibrate the analog output
and inputs. To enter the option, scroll to the Calibrate entry on the
Service Menu and press [ENTER]. The screen appears similar to
Figure 9-14 below.
Figure 9-14: The Outputs Window
in the Calibration Option
Calibrating the Analog Output
The calibration procedure consists of calibrating the analog
output zero point (0 or 4 mA) and then calibrating the full scale
span point (20 mA). You enter, first the setpoint, and then the
actual value measured with a digital ammeter or voltmeter. The
analog outputs have a resolution of ±5.0 µA. Press the [T] arrow
key to enter the Analog Output window.
Analog Output
Calibrate/Test I/O
Analog Input
Setpoint
Cancel OK
mA
4
Calibrate
Actual 4
4 mA 20 mA
Actual 20 mA
Reset
20