GE DigitalFlow GS868, Service Manual

Page: 19 / 74

DigitalFlow™ GS868 Service Manual 9
Chapter 1. Calibration
1.6 Calibrating the RTD Inputs
Calibrating an RTD option card involves a different procedure than for other analog input cards. However, you access
the card in the same manner as other cards.
1.6.1 Accessing the Calibration Menu
1. Press the
[CAL]
key to enter the Calibration Program .
2. Press
[Fx]
to calibrate the desired slot. (The option bar will include a slot listing for each installed option card.)
If you have installed an RTD option card, the following screen appears:
The Probe option allows the meter to calculate the temperature vs. resistance curve, based on input from the RTD in a
temperature bath or from an RTD calibrator. The Numer option forces the user to calculate and input the curve values
numerically.
IMPORTANT:
Use only one option for RTD calibration. Do not try to calibrate with both options.
1.6.2 Probe Option = [F1]
3. Press
[F1]
to select Input A, or
[F2]
to select Input B.
1.6.2a Set Point Temperature
4. Press
[F1]
to enter the set point temperature.
5. Enter the desired set point temperature, and press
[ENT].
This temperature should be at the low end of your expected
operating range.
6. Press
[F1]
to
STORE
the entered temperature, or
[F2]
to
ABORT
the calibration. In either case, the screen returns to the
ANALOG INPUT
prompt.
1.6.2b Slope Point Temperature
7. Press
[F2]
to enter the slope point temperature. This temperature should be as far from your set point as your
temperature bath will allow, within the range -100° to +350°C.
8. Enter the desired slope point temperature, and press
[ENT].
9. Press
[F1]
to
STORE
the entered temperature, or
[F2]
to
ABORT
the calibration. In either case, the screen returns to the
ANALOG INPUT
prompt.
10. Go to Procedure Options on page 10.
CALIBRATION Press
[F1]
to select the Probe method of calibration, or
[F2]
to select the
numeric method.
Slot x Inputs
current input selected
RTD CALIBRAT
last option selected
Probe Numer