DigitalFlow™ GF868 Service Manual (1 and 2-Channel) 9
Chapter 1. Calibration
1.5 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.
1.5.1 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.
1.5.2 Probe Option = [F1]
3. Press [F1] to select Input A, or [F2] to select Input B.
1.5.2a Set Point Temperature
4. Press [F1] to enter the set point temperature (formerly known as the zero point). This temperature should be at the
low end of your expected operating range.
5. Enter the desired set point temperature, and press [ENT].
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.
1.5.2b 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. Proceed to Procedure Options on the next page.
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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