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Appendix B. Example Programs

B.1 Single-Ended Voltage Measurement Example

Below is an example CR1000 program that uses the single-ended voltage

instruction to measure the sensor and uses the datalogger’s SW12V terminal to

power the sensor only when it is being measured. TABLE B-1 shows the

wiring used for the example.

Other CRBasic dataloggers are programmed similarly.

TABLE B-1. Wiring for Single-ended

Measurement Examples

Color Description CR1000

Yellow Temperature SE 2 (1L)

Blue Relative Humidity SE 1 (1H)

White Signal Reference

Red Power SW12V

Black Power Ground

Clear Shield

'CR1000 program to measure HMP155A with single-ended measurements

Public AirTC

Public RH

DataTable(Temp_RH,True,-1)

DataInterval(0,60,Min,0)

Average(1,AirTC,IEEE4,0)

Sample(1,RH,IEEE4)

EndTable

BeginProg

Scan(5,Sec,1,0)

'HMP155A Temperature & Relative Humidity Sensor measurements AirTC and RH:

PortSet (9,1)

Delay(0,2,Sec)

VoltSE(AirTC,1,mV2500,2,0,0,_60Hz,.14,-80)

VoltSE(RH,1,mV2500,1,0,0,_60Hz,0.1,0)

PortSet (9,0)

If RH>100 And RH<108 Then RH=100

CallTable(Temp_RH)

NextScan

EndProg

B-1

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Campbell HMP 35A Bedienerhandbuch Seite 29