Campbell Scientific 3WHB10K 3-Wire Half-Bridge Terminal Input Module - Manual (Page 9)

3WHB10K 3-Wire Half Bridge Terminal Input Module
5
4.4 CR9000X
'CR9000X Datalogger
Public RS_Ro, Temp_F
DataTable (Temp_F,1,-1)
DataInterval
(0,0,0.10)
Sample (1,Temp_F,FP2)
EndTable
BeginProg
Scan
(1,mSec,0,0)
BrHalf3W (Rs_Ro,1,V50,5,1,6,1,1,4200,True,30,40,100,0)
PRT (Temp_F,1,Rs_Ro,1.8,32)
CallTable Temp_F
NextScan
EndProg
4.5 CR1000
'CR1000 Series Datalogger
Public Rs_R0, Temp_C
DataTable (Hourly,True,-1)
DataInterval
(0,60,Min,0)
Average (1,Temp_C,IEEE4,0)
EndTable
BeginProg
Scan
(1,Sec,0,0)
BrHalf3W (Rs_R0,1,mV25,1,Vx1,1,2100,True ,0,250,100,0)
PRT (Temp_C,1,Rs_R0,1.0,0)
CallTable Hourly
NextScan
EndProg
5. 100 Ohm PRT in 3 Wire Half Bridge
The advantages of the 3-wire half bridge over other measurements that correct
for lead wire resistance such as a 4-wire half bridge, are that it only requires 3
lead wires going to the sensor and takes 2 single-ended input channels,
whereas the 4-wire half bridge requires 4 wires and 2 differential channels.