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

i
3WHB10K Table of Contents
PDF viewers note: These page numbers refer to the printed version of this document. Use
the Adobe Acrobat® bookmarks tab for links to specific sections.
1. Function ........................................................................1
2. Specifications ..............................................................1
3. Wiring ............................................................................2
4. Programming Examples ..............................................2
4.1 CR10(X) ...................................................................................................3
4.2 21X ...........................................................................................................4
4.3 CR7...........................................................................................................4
4.4 CR9000X..................................................................................................5
4.5 CR1000.....................................................................................................5
5. 100 Ohm PRT in 3 Wire Half Bridge ...........................5
5.1 Excitation Voltage ....................................................................................6
5.2 Calibrating a PRT .....................................................................................6
5.3 Compensation for Wire Resistance...........................................................7
Figures
1-1. Terminal Input Module ...........................................................................1
2-1. Schematic ................................................................................................1
3-1. 3-Wire Half Bridge Used to Measure PRT .............................................2
Tables
3-1. 3WHB10K Connections to Campbell Scientific Dataloggers.................2
4-1. Excitation Voltage for 100 Ohm PRT in 3WHB10K Based on
Maximum Temperature and Input Voltage Range...............................3