Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 274

Section 8. Operation basic code requirements. The DataTime() instruction is a more recent introduction that facilitates time stamping with system time. See Data Table Declarations (p. 475) and CRBasic Editor Help for more information. CRBasic Example 63. 'Declare Variables Public value Time Stamping with System Time 'Declare data table DataTable(Test,True,1000) Sample(1,Value,FP2) EndTable SequentialMode BeginProg Scan(1,Sec,10,0) 'Delay -- in an operational program, delay may be caused by other code Delay(1,500,mSec) 'Measure Value -- can be any analog measurement PanelTemp(Value,0) 'Immediately call SlowSequence to execute CallTable() TriggerSequence(1,0) NextScan 'Allow data to be stored 510 ms into the Scan with a s.51 time stamp SlowSequence Do WaitTriggerSequence CallTable(Test) Loop EndProg Other time-processing CRBasic instructions are governed by these same rules. Consult CRBasic Editor Help for more information on specific instructions. 8.1.2 Voltage The CR1000 incorporates a programmable gain input instrumentation amplifier (PGIA), as illustrated in figure PGI Amplifier (p. 275). The voltage gain of the instrumentation amplifier is determined by the user-selected range code associated with voltage-measurement instructions. The PGIA can be configured to measure either single-ended (SE) or differential (DIFF) voltages. For SE measurements, the voltage to be measured is connected to the H input while the L input is internally connected to signal ground ( ). CRBasic instructions BrHalf(), BrHalf3W(), TCSE(), Therm107(), Therm108(), Therm109(), and VoltSE() perform SE voltage measurements. For DIFF measurements, the voltage to be measured is connected between the H and L inputs on the PGIA. CRBasic 274