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Related Manuals for Campbell 3WHB10K
Summary of Contents for Campbell 3WHB10K
- Page 1 Revision: 03/2020 Copyright © 1996 – 2020 Campbell Scientific, Inc.
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Page 2: Table Of Contents
Table of contents 1. Function 2. Specifications 3. Wiring 4. Programming examples 4.1 GRANITE 9/10 program example 4.2 GRANITE 6/CR6 program example 4.3 CR1000X program example 4.4 CR1000 program example 4.5 CR9000X program example 5. 100 Ohm PRT in 3-wire half bridge 5.1 Excitation voltage 5.2 Calibrating a PRT 5.3 Compensation for wire resistance... -
Page 3: Function
A terminal input module (TIM) connects directly to a data logger or GRANITE analog input module. It provides completion resistors for resistive bridge measurements, voltage dividers, and precision current shunts. The 3WHB10k is used in 3-wire half bridge measurements and includes a 10 kΩ completion resistor. -
Page 4: Specifications
(PRT) attach to the 3WHB10K. The black excitation wire is connected to an excitation terminal. In the following example, the 3WHB10K is connected to the 1H and 1L terminals, using them for two single-ended measurements. The excitation wire is... - Page 5 Often, sensors only have two wires. Use the 3WHB10K as a fixed, known resistor to measure them. Wire a jumper between the H and L terminals on the 3WHB10K to allow the sensor to receive excitation voltage. Without the jumper, the sensor will not function. See FIGURE 3-1 (p.
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Page 6: Programming Examples
Table 3-1: 3WHB10K connections to Campbell Scientific data loggers CR3000, GRANITE GRANITE 6, CR1000X, Function Label/Wire analog input CR9000X CR800, CR850, module CR1000 Excitation Black wire Excitation 1 V1 high reference V1 low sense Ground ⏚ ⏚ ⏚ ⏚ The GRANITE 9 and GRANITE 10 do not directly make analog measurements. Instead, they use analog input modules such as the VOLT 108 or VOLT 116. -
Page 7: Granite 9/10 Program Example
(VOLT108,10, " " ,CPI_BUSA+1) 'Main Scan Scan (5,Sec,1,0) 'Half Bridge, 3-wire measurements on the VOLT 108 CDM_BrHalf3W (VOLT108,CPI_BUSA+1,Rs_R0,1,mV1000,1,1,1,3200,True,500,60,1,0) 'PRT temperature calculation PRTCalc (Temp_C_3wire,1,Rs_R0,0,1.0,0) 'Call Data Tables and Store Data CallTable Hourly NextScan EndProg 3WHB10K 3-Wire Half Bridge Terminal Input Module... -
Page 8: Granite 6/Cr6 Program Example
CRBasic Example 3: CR1000X 3-wire half bridge example 'CR1000X-series data logger 3-wire half bridge 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,mV1000,1,Vx1,1,3200,True ,0,250,100,0) PRTCalc (Temp_C,1,Rs_R0,0,1,0) CallTable Hourly NextScan EndProg 3WHB10K 3-Wire Half Bridge Terminal Input Module... -
Page 9: Cr1000 Program Example
CRBasic Example 5: CR9000X 3-wire half bridge example 'CR9000X data logger 3-wire half bridge Public Rs_Ro, Temp_F DataTable (Temp_F,1,-1) DataInterval (0,60,Min,0) Sample (1,Temp_F,FP2) EndTable BeginProg Scan (1,mSec,0,0) BrHalf3W (RS_Ro,1,mV1000,5,1,6,1,1,3200,True,30,40,100,0) PRTCalc (Temp_F,1,Rs_Ro,0,1.8,32) CallTable Temp_F NextScan EndProg 3WHB10K 3-Wire Half Bridge Terminal Input Module... -
Page 10: Ohm Prt In 3-Wire Half Bridge
This is typically less than 35 mA. Refer to the manufacturer's data sheet for the sensor for the specific value. Once the maximum excitation current is known, the excitation voltage is then calculated. Smax Where: = PRT completion resistor value 3WHB10K 3-Wire Half Bridge Terminal Input Module... -
Page 11: Calibrating A Prt
8.3 Ω. Two percent of 8.3 Ω is 0.17 Ω. Assuming that the greater resistance is in wire B, the resistance measured for the PRT (R = 100 Ω) in the ice bath would be 3WHB10K 3-Wire Half Bridge Terminal Input Module... - Page 12 0.1 °C lower than the actual temperature of the PRT. This source of error does not exist in a 4-wire half bridge where a differential measurement is used to directly measure the voltage across the PRT. 3WHB10K 3-Wire Half Bridge Terminal Input Module...
- Page 13 See Product Details on the Ordering Information pages at www.campbellsci.com. Other manufacturer's products, that are resold by Campbell Scientific, are warranted only to the limits extended by the original manufacturer.
- Page 14 Campbell Scientific reserves the right to refuse service on products that were exposed to contaminants that may cause health or safety concerns for our employees.
- Page 15 Do not recharge, disassemble, heat above 100 °C (212 °F), solder directly to the cell, incinerate, or expose contents to water. Dispose of spent batteries properly. WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR...
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