MPR
E-S
CAN
OPERATION
/
CALIBRATION
The final option of the calibration menu is “
Anlg. 0
" which activates the following display:
The analog zero is used to adjust the
displayed reading to agree with
customer testing methods. The
analog zero function can be thought
of as a fine zero adjustment of the
measurement reading, whereas the
R61 potentiometer on the sensing
head analog board is used for course
zero adjustments.
Auto Adjustment
To perform an automatic analog zero
adjustment, press the
“+/-”
button
while viewing the main screen. This
will display an
“S”
character
indicating the current displayed reading is stored. This should be done at approximately the same
time as the lab sample is taken for optimum accuracy. Once the sample has been read by the lab,
the operator can adjust the stored measurement reading to match by pressing the
“right arrow”
button, entering the desired lab reading using the numeric keys, and pressing
“enter”
when
complete. The display will show the change at the bottom of the screen. Press
“enter”
again to
store the changes.
The adjustment is only capable of changing the measurement voltage plus or minus 1.5 volts or
from 1433 to 2661 counts with 2047 being no correction.
If the adjustment requires more than plus or minus 1.5 measurement volts, an alarm “LAB
READING OUT OF ANALOG 0 RANGE” will be displayed. If this occurs then the course
zero adjustment R61 on the analog board in the sensing head will need to be adjusted.
Manual Adjustment
This allows the operator to directly adjust the 1433 to 2661 counts. This function is normally
only used to return the count to the 2047 “no correction” setting.
Analog Zero Adjustment Screen
2-14
