© Sensortech Systems, Inc. 2014 Page 6 of 15
Rev.5-2014
Diagnostics Mode
The Diagnostics mode parameters are stored and real-time measurement values, calibration values and
battery voltage.
To select the Diagnostics mode press <FUNCTION> repeatedly until ‘Diagnostics’ is displayed.
1. Press <ENTER> to select the Diagnostics mode.
2. Press <FUNCTION> repeatedly to advance through each parameter. Each parameter is displayed on
the top line and the parameter value is displayed on the bottom line of the display.
3. Unlock the Parameter Protection and press <SEND> to save changes to microprocessor memory.
The Diagnostic mode parameters are as follows:
•
‘Vref’
-
The lower display shows the reference raw-dielectric voltage level. This value should be
between 2.3 and 2.7 volts.
•
‘Vmeas’
- The lower display shows the measured raw-dielectric voltage level. This will decrease with
increasing moisture (dielectric). This value should be similar to the Vref value between 2.3 and 2.7
volts and decrease with increasing moisture near the Sensor Electrode.
•
‘Raw Diel.’
- The lower display shows the ratio of Vref/Vmeas which is the raw-dielectric. The raw-
dielectric value is the basic engineering unit proportional to moisture. In order to display actual
moisture, the PMT-330 applies a linear function involving a slope multiplier (Span) and offset (Zero).
This value should be approx. 1 in free air and increase with increasing moisture near the Sensor
Electrode.
•
‘Pre-Zero’
- The lower display shows the value that is computed when pressing <ENTER> while
‘Moisture’ is displayed. This is the value calculated during the Zero/Reference Operation calibration.
‘Pre-Zero’ value is subtracted from subsequent measurements. This value should be approx. 1 in free
air i.e. PMT-330 held upright with no moisture near the Sensor Electrode.
•
‘Std. Factor’
- The lower display shows the value that is computed during Standardization using the
Standardization Block. This value should be between 10 and 50.
•
‘Vbatt’
- The lower display shows the PMT-330 battery voltage. The PMT-330 continually monitors
the battery voltage and displays a warning when the battery is low. The Vbatt value will display
approx. +5.5 volts when the NiMH batteries are fully charged. When the PMT-330 needs to be
recharged, a ‘LB’ (low battery) warning appears on the sides of the moisture display. When the
battery is below operational voltage, a warning message ‘Recharge Batteries’ will be displayed and
the PMT-330 must be recharged before further use. If the voltage is less than the minimum operating
voltage, the PMT-330 will not power on and needs to be recharged for 30 minutes or longer.