Delta-T HH2, User Manual

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Technical Reference

89
Readings can't be stored
This may occur because the HH2 has detected an error. It will have reported it once
and partially repaired it.
To clear the error condition cold-boot the HH2. Cold-booting will destroy any data that
are already stored, so you might want to try (no guarantee of success if readings are
corrupted) to download any stored readings before proceeding.
See To Cold Boot the HH2 on page 86.
Meter will not sleep
If the meter is not sleeping, then check that there is no RS232 communication from
the PC and that there is not a fault from the attached device which may be constantly
or intermittently applying power to the meter inputs.
Meter will not respond
If the Moisture Meter appears to lock up and is not responding to key presses try
disconnecting it if it is attached to a sensor or PC.
If this fails try resetting the Moisture Meter to its default values by cold-booting it.
Doing this will lose all your readings and Options settings!
See To Cold Boot the HH2 on page 86.
Error with Profile Probe
When only mm Deficit is selected, only the first Error field is used by the HH2. The
others stay blank.
If an error occurs when reading any of the sensors in a Profile Probe then the
Moisture Meter reports an error on the display. If you are recording mm deficit it is
recommended that you change the units displayed, via the Options, Display menu, to
two sets of units, i.e. mm D %vol, or mm d m
3
.m
-3
. This will allow all
good readings to display and be recorded, and the Error fields will indicate the nature
of the error affecting the other, faulty, sensors.
This does not fix the problem, but at least it allows you to recover the good data.
If faulty sensors exist and are all lowest in the PR2 then the HH2 will use the lowest
good sensor and extrapolate down to the Root Depth to calculate mm deficit.
If a faulty sensor exists which is higher than a good sensor in the PR2 then the HH2
does not try to calculate mm Deficit, and reports an error.