Accessing The Calibration Menu; Calibrating The Low End Of The Output Range; Calibrating The High End Of The Output Range; Testing The Analog Output Linearity - GE DigitalFlow GS868 Service Manual

Chapter 1. Calibration

1.4 Accessing the Calibration Menu

[CAL]
1. Press the key to enter the Calibration Program.
[Fx]
2. Press to calibrate the desired slot. (The option bar will include a slot listing for each installed option card.)
[Fx]
3. Press to select the desired output.
IMPORTANT:
The procedure for calibrating all the outputs is the same. However, when calibrating a different output, be
sure to reconnect the ammeter to the appropriate pins on terminal block I/O. See Figure 1 on page 2 or
Figure 2 on page 3 for the correct pin numbers.

1.4.1 Calibrating the Low End of the Output Range

[F1]
1. Press to calibrate the low end of the output range.
[F1] [F2]
2. Press or to adjust the ammeter reading
Numer,
enter a numeric value for the calibration point and press
[F4] STORE
3. Press to the setting, or press
Note: If the ammeter reading cannot be adjusted within 5.0 A of the 4 mA setting, contact the factory for assistance.

1.4.2 Calibrating the High End of the Output Range

[F2]
1. Press to calibrate the high end of the output range.
[F1] [F2]
2. Press or to adjust the ammeter reading
Numer
, enter a numeric value for the calibration point and press
Note: If the ammeter reading cannot be adjusted within 5.0 A of the 20 mA setting, contact the factory for
assistance.
[F4] STORE
3. Press to the setting, or press
Note: Skip the next section if the linearity test will not be performed at this time. Go to Procedure Options on page 5.

1.4.3 Testing the Analog Output Linearity

Note: If you exited this menu and are returning, follow steps 1 through 3 in
[F3] TEST
1. Press to the linearity of the currently selected analog output.
2. Check the ammeter reading at the 50% output level.
3. Then, enter a different output level (0-100%) and press
4. Check the ammeter reading at this setting and press
Table 1 on page 5 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.
4
UP DOWN
or , until a 4 mA reading is achieved. If you press

[F1] ABORT
and to the calibration.
UP DOWN
or , until a 20 mA reading is achieved. If you press

[F1] ABORT
and to the calibration.
[ENT]
.
[ENT]
when done.
[ENT].
[ENT]
.
Accessing the Calibration Menu
DigitalFlow™ GS868 Service Manual
[F3],
[F3],
on page 4.