3WHB10K 10 kohm, 3-Wire Half-Bridge Terminal Input Module


The 3WHB10K provides the completion resistor required for a 3-wire half-bridge measurement. It is typically used with 100 Ω and 1000 Ω platinum resistive thermometers (PRTs).

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Benefits and Features

  • Makes accurate measurement of 3-wire half bridges simple
  • Easy to install or remove
  • Connects directly into datalogger input terminals
  • Compatible with most Campbell Scientific dataloggers


Detailed Description

3WHB10K Schematic 

3WHB10K-to-Sensor Hookup


Completion Resistor 10 kΩ (bulk metal foil)
Tolerance ±0.01% (@ 25°C)
Maximum Temperature Coefficient ±8 ppm/°C
Power Rating 0.25 W (@ 70°C)
Dimensions 1.5 x 1.5 x 2.7 cm (0.6 x 0.6 x 1.0 in.) for body with prongs
Weight 6 g (0.2 oz)



The AM16/32-series and AM25T multiplexers are compatible with the 3WHB10K.

Datalogger Considerations

The 3WHB10K uses two adjacent single-ended analog inputs; an adjacent analog ground channel accepts the "ground prong" of the 3WHB10K. Not all datalogger terminal strips have this sequence on all channels, so please check your datalogger's wiring panel to confirm channel assignments, especially if you plan to use multiple terminal input modules.

Newer CR10X Wiring Panels can accommodate both the 3WHB10K and the cover associated with the CR10XTCR (reference thermistor for thermocouple measurements). Specifically, the physical configuration of the thermocouple cover, the datalogger input terminals, and the terminal input modules allow sufficient room for the cover to be used with a Terminal Input Module attached. In contrast, older CR10TCRs are not deep enough.

Compatible Contemporary Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR9000X CR6 CR300 Series

Compatible Retired Datalogger

CR500 CR510 CR10 CR10X 21X CR23X CR5000 CR7X CR9000
** *

Datalogger Notes:
*Compatible CR9000(X) modules are the CR9050 and the CR9052; the CR9051 is partially compatible.

**As shipped, the prongs on the 3WHB10K are too short to fit the CR7. If you're determined to use the 3WHB10K with a CR7, you can solder wire to the prongs, thereby extending their length.

Frequently Asked Questions

Number of FAQs related to 3WHB10K: 3

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  1. Yes. The 3WHB10K is required to measure three-wire temperature probes on the AM16/32B. As both RTDs and thermistors can be measured on the 3WHB10K, refer to the AM16/32B Relay Multiplexer Instruction Manual for the proper programming.

  2. Yes. The CR1000 can measure eight PT100 sensors with a 3WHB10K terminal input module. The measurement instructions, however, have to reflect that more than one sensor is being excited with the same excitation channel (MeasPEx argument) in the BrHalf() or BrHalf3W() instruction.

  3. The 4WPB100, 4WPB1K, and 4WHB10K terminal input modules can be used instead of the 3WHB10K module. However, to maintain the enhanced accuracy of the four-wire half-bridge instruction, it is pertinent when adding the fourth wire to maintain the same resistance as the other three wires (same wire size and manufacturer). Note that simply adding a short jumper wire on the 4WPB100, 4WPB1K, or 4WHB10K modules to complete the fourth wire will not maintain the accuracy.