Testing Output Linearity - GE AquaTrans AT868 User Manual

Testing Output Linearity

Procedure Options
Calibration
1. Press [ESC], [ENTER], [ESC]. The meter enters the user program.
2. Press [ ] until CALIB appears and press [ENTER].
3. Press [ ] until SLOT0 appears and press [ENTER].
4. Press [ ] until A or C appears and press [ENTER].
5. Press [ ] to select Test and press [ENTER].
6. Under % Full Scale enter 50.00 by using the arrow keys. Press
]
[ and [ ] to move the cursor to desired location and press
and [ ]
to increase or decrease the number and 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. Refer to this table to verify the accuracy
of the ammeter readings taken above.
Note: If the linearity test readings are not with 5
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
the factory for assistance.
8. Repeat Step 2 but enter a different output (0-100%). Check the
ammeter reading at this setting and press [ENTER] when done.
Table 4-1: Expected Ammeter Readings
% Full Scale
0
10
20
30
40
50
60
70
80
90
100
* all ammeter readings should be ±0.005 mA
After completing the above steps, the meter returns to the ANALOG
OUTPUT window. Do one of the following:
•
To perform another programming function, refer to Appendix
A, Menu Maps, to navigate to the desired menu.
To leave the User Program, press [ESC] three times.
•
µ
4-20 mA Scale* 0-20 mA Scale*
4.000
5.600
7.200
8.800
10.400
12.000
13.600
15.200
16.800
18.400
20.000
September 2004
[ ]
A of the values
0.000
2.000
4.000
6.000
8.000
10.000
12.000
14.000
16.000
18.000
20.000
4-3