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
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