DewPro<Superscript>® MMR31 Installation & Operation Manual
23
Chapter 4. Optional Display/User Interface
4.4
Matrix Functions
This section describes the functions available to the user through the matrix, grouped by common function areas
(see
). Each function is accessed by moving to its specified location within the matrix.
4.4.1
System Administration Functions
Table 5:
Function
Location
Description
Locking/
Unlocking
the Matrix
VH 89
This location allows the user to lock and unlock the matrix input functions. When the
matrix is locked, the
V
and
H
keys are still functional but the
+
and
–
keys are disabled.
This prevents unauthorized modification of any of the user input functions, such as
output ranging or units selection. Entering the value
50
in this location unlocks the
matrix. Any other value locks the matrix. (Default: 0)
System Reset
VH 99
This location allows the user to reset the system electronics in a manner similar to
removing and re-applying power. No system parameter settings are modified. Entering
the value
50
in this location initiates the reset, and after approximately five (5) seconds
the reset is executed. After the reset, normal operation is resumed at location
VH 00
.
Transmitter
Identification
VH 92
This location displays the identification number of the transmitter. The display should
read
200
.
Software
Version
VH93
This location displays the version number of the instrument software.
Two-Point
Calibration
Using Any
Low and High
RH Value
VH67
In this location, the calibration using
VH 68
and
VH 69
is enabled by entering any digit
other than
0
. Follow the steps described in
“Calibration Steps” on page 16
. Enter
11.3
in
VH 68
and
75.4
in
VH 69
.
If a different moisture source is being used (e.g., a variable moisture generator or other
saturated salt solutions), any low value can be entered in
VH 68
and any high value in
VH 69
. Be sure the high and low values differ by at least 20%.
The hardware buttons on the printed circuit board are still active, performing an
11.3
and
75.4
calibration. As described in
“Calibration Steps” on page 16
, location
VH 68
would
reset to
11.3
and location
VH 69
to
75.4
.
Low RH Point
Calibration
VH68
Enter the low RH value in % when the reading is stable.
VH 67
has to have a value other
than
0
. Be sure the high and low values differ by at least 20%.
High RH Point
Calibration
VH 69
Enter the high RH value in % when reading is stable.
VH 67
has to have a value other than
0
. Be sure the high and low values differ by at least 20%.