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resources:eval:user-guides:circuits-from-the-lab:cn0295 [28 Jul 2017 07:26] – [OVERVIEW] erbe reytaresources:eval:user-guides:circuits-from-the-lab:cn0295 [29 Jul 2021 07:17] (current) – Hardware Registration Harvey John De Chavez
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 ---- ----
  
-===== GENERAL SETUP ===== +===== DEMO REQUIREMENTS ===== 
-  * [[http://www.analog.com/EVAL-CN0295-EB1Z|EVAL-CN0295-EB1Z]]  circuit evaluation board+  * [[adi>EVAL-CN0295-EB1Z|EVAL-CN0295-EB1Z]]  circuit evaluation board
   * +7V to +24V power supply or equivalent power supply   * +7V to +24V power supply or equivalent power supply
   * Precision power supply    * Precision power supply 
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 ===== HARDWARE SETUP ===== ===== HARDWARE SETUP =====
-{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:functional_block_diagram.png?direct&500 |}}+
  
  
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 <note important>In order for the circuit to operate properly, the supply voltage, must be greater than 7 V in order to provide sufficient headroom.</note>  <note important>In order for the circuit to operate properly, the supply voltage, must be greater than 7 V in order to provide sufficient headroom.</note> 
 ==== Input Signal ==== ==== Input Signal ====
-     * Using Actual Sensor + 
-       * A differential output bridge type sensor should be attached to a 4 channel screw terminal block (J1) labeled with SUPPLYSNS on the PCB.  +=== Using Actual Sensor === 
-       * A differential sensor gauge like from [[https://sensing.honeywell.com/index.php?ci_id=45106|Honeywell]] or from [[http://www.nxp.com/products/sensors/pressure-sensors:DRSNSPRSSR|NXP]] can be used for evaluation.  +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:cn0295_sensor_interface.png?direct&500 |}} 
-     * Using Simulated input sensor  +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:cn0295_sensor_interface_table.png?direct&300 |}} 
-       * A dual power supply can be used to power up the board from Vout1 and to generate a common-mode voltage of 2.5 V from Vout2 shown in the block diagram for test setup. + 
-       * A precision voltage source generates the 0 to 100 mV differential input voltage at the in-amp input, which then simulates the sensor output shown in the block diagram for test setup.  +  - A differential output bridge type sensor should be attached to a 4 channel screw terminal block (J3) labeled with SUPPLYSNS on the PCB. 
-       * 3 kΩ at R_bridge simulates the bridge type sensor impedance.+  - A differential sensor gauge like from [[http://www.nxp.com/products/sensors/pressure-sensors:DRSNSPRSSR|NXP]] which can be used for evaluation.  
 +<note note> 
 +  * Vsense is where the analog voltage output of the sensor is being taken for measurement.  Pin polarity should be take into account. 
 +  * V/Iforce is the sensor excitation or is being supplied either from current or voltage source.   
 +</note> 
 + 
 +<note important> 
 +Pin polarity for Vsense and for V/Iforce should be take into consideration 
 +</note> 
 + 
 +=== Using Simulated input sensor === 
 +The following configuration can be used to simulate the sensor characteristic for evaluation purposes. 
 +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:functional_block_diagram.png?direct&500 |}}  
 + 
 +  - A dual power supply can be used to power up the board from Vout1 and to generate a common-mode voltage of 2.5 V from Vout2 shown in the block diagram for test setup. 
 +  - A precision voltage source generates the 0 to 100 mV differential input voltage at the in-amp input, which then simulates the sensor output shown in the block diagram for test setup.  
 +  - 3 kΩ at R_bridge simulates the bridge type sensor impedance. 
 + 
 +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:cn0295_r6.png?direct&100|}} 
 <note Note>For lower than 5 kΩ bridge resistance, the drive voltage can be decreased down to 5 V using a buffer configuration by removing resistor R6.</note> <note Note>For lower than 5 kΩ bridge resistance, the drive voltage can be decreased down to 5 V using a buffer configuration by removing resistor R6.</note>
-==== Current Meter ====  + 
-     * The Agilent 3458A or any equivalent current meter can be used to measure the actual loop current output of the evaluation board. + 
-==== Sensor Drive ==== + 
-     * The circuit can be switched to the current for voltage drive configuration by moving S1 to the position labeled on the PCB. + 
 +==== Sensor Drive ====  
 +The circuit can be switched to the current or voltage drive configuration by moving S1 to the position labeled on the PCB.  
 +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:cn0295_switch.png?direct&300 |}} 
 + 
 + 
 +=== Voltage Drive Configuration === 
 +  * In the voltage drive mode with VDRIVE = 10 V, the supply voltage VLOOP or system supply must be greater than 10.2 V  
 +=== Current Drive Configuration === 
 +  * In the current drive mode, the supply voltage VLOOP or system supply must be greater than 11.2 V in order to maintain sufficient headroom.
 <note Note> <note Note>
-  * The minimum loop supply voltage is also dependent on the configuration of the drive circuit for the bridge.  +Current drive configuration can be used for four-wire ohm circuit configuration where in the main advantage of this configuration is that the voltage is measured directly across the load cell, neglecting the load effect of the lead wires for long distance measurements.
-  * In the voltage drive mode with VDRIVE = 10 V, the supply voltage VLOOP must be greater than 10.2 V and in the current drive mode must be greater than 11.2 V in order to maintain sufficient headroom.+
 </note> </note>
 +<note important>
 +Both for voltage and current drive mode, the minimum loop supply voltage is dependent on the configuration of the drive circuit for the bridge. 
 +</note>
 +
 +==== Output Measurements ==== 
 +The output of the system can be measured in two ways, either through direct output current measurement or voltage output through the series resistor.  
 +
 +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:cn0295_measurements.png?direct&500 |}}
 +
 +
 +===   * Voltage Measurement ===
 +  * Voltage output measurement is done across a series 250ohms resistor though screw type terminal block (P1).
 +<note important>It is important that the 2-pin male header (J1) be populated first before doing a voltage measurement across the terminal block (P1)</note>
 +
 +{{ :resources:eval:user-guides:circuits-from-the-lab:cn0295:cn0295_r14.png?direct&100|}}
 +
 +===   * Current Measurement ===
 +  * Current output measurement is done by connecting the positive terminal of the current meter at one pin of the male header shunt terminal (J1) and the negative terminal of the meter connected to the other pin of the same male header shunt terminal.
 +
 +<note Note>
 +The system has an onboard resistor load (R14) of 500ohms that can be de-soldered to replace with a desired resistor load value 
 +</note>
 +
 ---- ----
 ===== SCHEMATICS, PCB LAYOUT, BILL OF MATERIALS ===== ===== SCHEMATICS, PCB LAYOUT, BILL OF MATERIALS =====
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 </WRAP> </WRAP>
  
 +=====Registration===== 
 +<WRAP round tip 80% >
 +Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware.  [[reg>EVAL-CN0295-EB1Z?&v=RevD|Register]] to receive all these great benefits and more!
 +</WRAP>
 // End of Document // // End of Document //
resources/eval/user-guides/circuits-from-the-lab/cn0295.1501219569.txt.gz · Last modified: 28 Jul 2017 07:26 by erbe reyta

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