Panametrics DigitalFlow GM868, Руководство по обслуживанию

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Chapter 1. Calibration
4 DigitalFlow™ GM868 Service Manual
1.4 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.)
3. Press [Fx] 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 above for the correct pin numbers.
1.4.1 Calibrating the Low End of the Output Range
1. Press [F1] to calibrate the low end of the output range.
2. Press [F1] or [F2] to adjust the ammeter reading UP or DOWN , until a 4 mA reading is achieved. If you press [F3],
Numer, enter a numeric value for the calibration point and press [ENT].
3. Press [F4] to STORE the setting, or press

and [F1] to ABORT the calibration.
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
1. Press [F2] to calibrate the high end of the output range.
2. Press [F1] or [F2] to adjust the ammeter reading UP or DOWN , until a 20 mA reading is achieved. If you press [F3],
Numer, enter a numeric value for the calibration point and press [ENT].
Note: If the ammeter reading cannot be adjusted within 5.0

A of the 20 mA setting, contact the factory for
assistance.
3. Press [F4] to STORE the setting, or press

and [F1] to ABORT the calibration.
Note: Skip the next section if the linearity test will not be performed at this time. Proceed to Procedure Options on
the next page.
1.4.3 Testing the Analog Output Linearity
Note: If you exited this menu and are returning, follow steps 1 through 3 in Accessing the Calibration Menu on
page 4.
1. Press [F3] to TEST 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 [ENT] .
4. Check the ammeter reading at this setting and press [ENT] when done.
Table 1 on the next page 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.