Electrical Calibration Page - ABB ZDT Installation And Operating Manual

A.3 Electrical Calibration Page
In this section the actual values denoted by 'x x x x x ' are unimportant and are used to determine display reading stability, when
carrying out the electrical calibration procedure.
-----
ELECTRICAL CAL.
xxxxx
Calibrate
xxxxx
mV Zero 1
xxxxx
mV Span 1
xxxxx
mV Zero 2
xxxxx
mV Span 2
25. 0
Adjust CJ Value
-----
Adjust RTX Zero
-----
Adjust RTX Span
Operating Page

Electrical Calibration Page

(To access this page see Fig. 7.1)
Calibrate
Select YES to access the electrical calibration sequence. Select NO to
advance to the
NO
YES
mV Zero 1
Set the Cell simulator millivolt source to –20mV and allow the display to
stabilize.
-20mV
mV Span 1
Set the Cell simulator millivolt source to 180mV and allow the display to
stabilize.
180mV
mV Zero 2
Set the Temperature simulator millivolt source to 10mV and allow the display to
stabilize.
10mV
mV Span 2
Set the Temperature simulator millivolt source to 40mV and allow the display to
stabilize.
40mV
Adjust Cold Junction Value
Measure the ambient temperature and set the display to the measured value,
in °C.
Adjust RTX Zero
Adjust the display until the milliammeter reads the minimum retransmission
level. i.e. 4mA.
Adjust RTX Span
Adjust the display until the milliammeter reads the maximum retransmission
level. i.e. 20mA.
Press
Press
APPENDIX A – ELECTRICAL CALIBRATION
parameter.
Adjust RTX Zero
to return to the top of the
Electrical Calibration Page.
to advance to the
Operating Page.
23