16.5.1 Table definitions 83
16.5.1.1 Header rows 83
16.5.1.2 Data records 85
16.6 Creating data tables in a program 85
17. Data memory 88
17.1 Data tables 88
17.2 Flash memory 89
17.2.1 CPU drive 89
18. Measurements 90
18.1 Voltage measurements 90
18.1.1 Single-ended measurements 91
18.1.2 Differential measurements 92
18.2 Current-loop measurements 92
18.2.1 Voltage ranges for current measurements 93
18.2.2 Example current-loop measurement connections 93
18.3 Resistance measurements 95
18.3.1 Resistance measurements with voltage excitation 95
18.3.2 RTD and PRT 98
18.3.3 Strain measurements 98
18.3.4 Accuracy for resistance measurements 100
18.4 Period-averaging measurements 101
18.5 Pulse measurements 102
18.5.1 Low-level AC measurements 103
18.5.2 High-frequency measurements 103
18.5.3 Switch-closure and open-collector measurements 104
18.5.3.1 P_SW Terminal 104
18.5.3.2 C terminals 105
18.5.4 Quadrature measurements 105
18.5.5 Pulse measurement tips 106
18.5.5.1 Input filters and signal attenuation 107
18.5.5.2 Pulse count resolution 107
18.6 Vibrating wire measurements 107
18.6.1 VSPECT® 107
19. Communications protocols 108
19.1 General serial communications 109
Table of Contents - iv
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