Calibration 4-3
September 2004
Testing Linearity (cont.) 6. Under % Full Scale use the arrow keys to enter 50.00. Press [W]
and [X] to move the cursor to desired character position and press
[S] and [T] to increase or decrease the number to the desired
value. Then, press
[ENTER].
7. Check the ammeter reading. Table 4-1 below lists the expected
ammeter readings at various % Full Scale settings for both
4-20 mA and 0-20 mA scales. Use this table to verify the accuracy
of your ammeter reading.
Note: If the linearity test readings are not with ±5
μA of the values
listed in Table 4-1, check the accuracy and wiring of the
ammeter. Then, repeat the low and high end calibrations. If
the analog output still does not pass the linearity test, contact
GE for assistance.
8. Repeat Step 2 for a different output percentage (0-100%). Check
the ammeter reading at this setting and press
[ENTER] when done.
Table 4-1: Expected Ammeter Readings
% Full Scale 4-20 mA Scale* 0-20 mA Scale*
0 4.000 0.000
10 5.600 2.000
20 7.200 4.000
30 8.800 6.000
40 10.400 8.000
50 12.000 10.000
60 13.600 12.000
70 15.200 14.000
80 16.800 16.000
90 18.400 18.000
100 20.000 20.000
* all ammeter readings should be ±0.005 mA
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