Campbell CR6 - Page 7

4. Working with data 48
4.1 Default data tables 48
4.2 Collecting data 49
4.2.1 Collecting data using LoggerNet 49
4.2.2 Collecting data using PC200W or PC400 49
4.3 Viewing historic data 50
4.4 Data types and formats 50
4.4.1 Variables 51
4.4.2 Data storage 52
4.5 About data tables 53
4.5.1 Table definitions 54
4.5.1.1 Header rows 54
4.5.1.2 Data records 56
4.6 Creating data tables in a program 56
5. Data memory 58
5.1 Data tables 58
5.2 Memory allocation 58
5.3 SRAM 59
5.3.1 USRdrive 60
5.4 Flash memory 60
5.4.1 CPU drive 61
5.5 MicroSD (CRD:drive) 61
5.5.1 Formatting microSD cards 62
5.5.2 MicroSDcard precautions 62
5.5.3 Act LED indicator 62
6. Measurements 64
6.1 Voltage measurements 64
6.1.1 Single-ended measurements 65
6.1.2 Differential measurements 66
6.1.2.1 Reverse differential 66
6.2 Current-loop measurements 66
6.2.1 Example Current-Loop Measurement Connections 67
6.3 Resistance measurements 69
6.3.1 Resistance measurements with voltage excitation 70
6.3.2 Resistance measurements with current excitation 72
Table of Contents - iii