GE DigitalFlow DF968, Руководство по обслуживанию

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Calibration 1-7
March 2008
Calibrating the Analog
Inputs (cont.)
For this discussion, assume that the option card has been installed in
Slot x
.
Note:
The zero point of the analog input may be set for either 0 mA
or 4 mA. However, the calibration procedure always uses the 4
mA point, as the meter will extrapolate this value to obtain the
0 mA point.
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 1-3 on page 1-6 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
on the next
page.
•
If you selected
[F2] (aHIGH)
,
proceed to
aHIGH Option
on the next
page.
•
If you selected
[F3] (4 mA),
proceed to
4 mA Option
on the next
page.
•
If you selected
[F4] (20 mA)
,
proceed to
20 mA Option
on the next
page.