4WHB10K 10 kohm, 4-Wire Half-Bridge Terminal Input Module

Overview

The 4WHB10K provides the completion resistor required for 4-wire half-bridge measurements. This module should be used with sensors that have a 10 kΩ resistance.

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Benefits and Features

  • Makes accurate measurement of 10-kohm, 4-wire half bridges simple
  • Easy to install or remove
  • Connects directly into datalogger input terminals
  • Compatible with most Campbell Scientific dataloggers

Images

Detailed Description

4WHB10K Schematic 

4WHB10K-to-Sensor Hookup

Specifications

Completion Resistor 10 kΩ (bulk metal foil)
Tolerance ±0.01% (@ 25°C)
Maximum Temperature Coefficient ±0.8 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)

Compatibility

Datalogger Considerations

The 4WHB10K uses two sequential differential analog inputs; the first differential channel must have an adjacent analog ground channel to accept the "ground prong" of the 4WHB10K. 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 and the CR10XTCR Thermocouple Cover are deep enough to cover the datalogger input channels with a Terminal Input Module attached; older CR10TCRs are not deep enough.

Programming

The 4WHB10K is measured either with CRBasic's BrHalf4W Instruction or Edlog's Instruction 9 (Full-Bridge with Excitation Compensation).

Compatible Contemporary Dataloggers

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

Compatible Retired Dataloggers

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 4WHB10K are too short to fit the CR7. If you're determined to use the 4WHB10K with a CR7, you can solder wire to the prongs, thereby extending their length.


Frequently Asked Questions

Number of FAQs related to 4WHB10K: 2

  1. For more information, refer to the “PRT in 4 Wire Half Bridge” section in the 4WPB100, 4WPB1K PRT Bridge Terminal Input Modules Instruction Manual. Figure 2-1 in the manual provides a circuit schematic.

  2. 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.