8588A/8558A
Operators Manual
Enter the appropriate information for each of the fields listed with the navigation
keys and numeric keypad.
Power uncertainty = Power coefficient x {1 - (Measured current/Power ref level)
Push to (Save as new) the ACI Ext Shunt, or push (Save
changes) to save the shunt changes. See the screen below:
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•
Asset number (shown as the first field on the shunt information line of
the main DCI Ext Shunt screen)
•
Manufacturer
•
Model (shown as the second field on the shunt information line)
•
Serial Number
•
Resistance value: Use the numeric keypad and to input the
resistance value of the shunt, for example from the most recent
calibration certificate. Resistance value is displayed as the fourth field in
the shunt information line.
•
Maximum current: Use the numeric keypad and to input the
maximum current that can be applied to the shunt without causing a
resistance value change. Maximum current is displayed as the third field
in the shunt information line.
•
Power ref. level: Enter the current level used when calibrating the shunt
resistance value.
•
Power coefficient: Enter the power coefficient of the shunt, in μA/A.
The Power ref level and Power coefficient entries show the uncertainty of the
displayed current due to self-heating of the shunt. The Power uncertainty is
shown as an integer value between 0 μA/A and 999,999 μA/A, and does not
affect the calculated current. See the screen below.
Calculation of the Power Uncertainty:
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