Mode Of Operation - GE DewPro MMY30 User Manual

November 2005
Special Calibration (cont.)

Mode of Operation

4-6
8. Adjusting the Current Loop Hardware at 4 mA
Location
in Matrix
VH By connecting an ammeter in the loop, the correct cur-
rent (4 mA) can be adjusted by increasing or decreas-
38
ing the displayed digits.
Note: If the matrix input is locked (VH89), the calibra-
tion values are displayed but the current output is
unaffected. To enable adjustments, VH89 has to be
unlocked by entering "50" into this field.
9. Adjusting the Current Loop Hardware at 20 mA
Location
in Matrix
VH Selection of this field assists during calibration, gener-
ating a nominal 20 mA signal, but the actual value
39
must be 21.92 mA, an over range to a dewpoint of
22°C. By connecting an ammeter in the loop, the cor-
rect current (21.92 mA) can be adjusted by increasing
or decreasing the displayed digits.
Note: If the matrix input is locked (VH89), the calibra-
tion values are displayed but the current output is
unaffected. To enable adjustments, VH89 has to be
unlocked by entering "50" into this field.
10. Input Locking.
Location
in Matrix
VH Any number other than "50" will lock the instrument
settings from inadvertent or unauthorized changes.
89
(The instrument is only unlocked at "50.")
Description of Function
Description of Function
Description of Function
The Optional Display/User Interface (Option G)