9.6 Resetting the data logger 135
9.6.1 Processor reset 135
9.6.2 Program send reset 135
9.6.3 Manual data table reset 136
9.6.4 Formatting drives 136
9.6.5 Full memory reset 136
9.7 Troubleshooting power supplies 136
9.8 Using terminal mode 137
9.8.1 Serial talk through and comms watch 140
9.8.2 SDI-12 transparent mode 140
9.8.2.1 SDI-12 transparent mode commands 142
9.9 Ground loops 142
9.9.1 Common causes 143
9.9.2 Detrimental effects 143
9.9.3 Severing a ground loop 145
9.9.4 Soil moisture example 145
9.10 Improving voltage measurement quality 147
9.10.1 Deciding between single-ended or differential measurements 147
9.10.2 Minimizing ground potential differences 148
9.10.2.1 Ground potential differences 149
9.10.3 Detecting open inputs 149
9.10.4 Minimizing power-related artifacts 150
9.10.4.1 Minimizing electronic noise 151
9.10.5 Filtering to reduce measurement noise 152
9.10.5.1 CR6 filtering details 152
9.10.6 Minimizing settling errors 153
9.10.6.1 Measuring settling time 153
9.10.7 Factors affecting accuracy 155
9.10.7.1 Measurement accuracy example 156
9.10.8 Minimizing offset voltages 156
9.10.8.1 Compensating for offset voltage 158
9.10.8.2 Measuring ground reference offset voltage 159
9.11 Field calibration 160
9.12 File system error codes 161
9.13 File name and resource errors 162
9.14 Background calibration errors 162
Table of Contents - vii
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