GE DigitalFlow DF868, Руководство по обслуживанию

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Chapter 1. Calibration
6 DigitalFlow™ Multipurpose Ultrasonic Liquid Flowmeter Service Manual
1.4.1 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.)
3. Press
[F1]
to select the desired input.
The procedure for calibrating
Input A
is identical to that for calibrating
Input B
. However, when calibrating
Input B
, be
sure a calibrated current source is connected to the appropriate pins on the terminal block. See Figure 3 on page 5 for
the correct pin numbers.
4. Press
[F1]-[F4]
to select the reference point to be calibrated.
Do one of the following:
•
If you selected
[F1] (aLOW),
proceed to
aLOW Option
below.
•
If you selected
[F2] (aHIGH)
,
proceed to
aHIGH Option
below.
•
If you selected
[F3] (4 mA),
proceed to
4 mA Option
below.
•
If you selected
[F4] (20 mA)
, proceed to
20 mA Option
below.
1.4.2 aLOW Option = [F1]
1. Enter the low reference value and press the
[ENT]
key.
2. Press
[F1]
to store the current low reference value or press
[F2]
to cancel the entry. In either case, the
ANALOG INPUT
prompt will reappear.
3. Press
[F2]
to proceed to the next section.
1.4.3 aHIGH Option = [F2]
1. Enter the high reference value and press the
[ENT]
key.
2. Press
[F1]
to store the current high reference value or press
[F2]
to cancel the entry. In either case, the
ANALOG INPUT
prompt will reappear.
3. Proceed to Procedure Options on page 7.
1.4.4 4 mA Option = [F3]
1. Connect the 4 mA current source to the currently selected analog input, as shown in Figure 3 on page 5.
2. Press
[F1]
to store the current 4 mA value or press
[F2]
to cancel the entry. In either case, the
ANALOG INPUT
prompt
reappears.
3. Press
[F4]
to proceed to the next section.