GE DigitalFlow GS868, Service Manual

Page: 17 / 74

DigitalFlow™ GS868 Service Manual 7
Chapter 1. Calibration
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.)
3. Press
[Fx]
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 the previous
page for the correct pin numbers. To calibrate a 0/4-20 mA input card, see the section below.
Note:
To calibrate an RTD input card, refer to page 9.
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
on page 8.
1.5.2 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.
1.5.3 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. Go to Procedure Options below.
1.5.4 4 mA Option = [F3]
1. Connect the 4 mA current source to the currently selected analog input, as shown in Figure 3 on page 6.
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.