SGA01 Strain Gauge Amplifier User Guide
Contents
1. 85 C 30 04 2008 Page 5 of 6 SGAO1 Strain Gauge Amplifier Contact Information Racelogic Ltd Unit 10 Swan Business Centre Osier Way Buckingham MK18 1TB UK Tel 44 0 1280 823803 Fax 44 0 1280 823595 Email support racelogic co uk Web www racelogic co uk RACELOGIC be 25 MER Revision Date Description Author 1 24 07 2007 First Draft JH 2 11 01 2008 First Issue JH 3 30 04 08 Updated contact details MG 30 04 2008 Page 6 of 62. SGAO1 Strain Gauge Amplifier RACELOGIC eM LES SGAO01 Strain Gauge Amplifier User Guide Page 1 of 6 SGAO01 Strain Gauge Amplifier RACELOGIC oh LER Contents CONTENTS e 2 TN TFRODUCT ION Ps E 3 CONNECTION e 3 PULL BRIDGE Oniebj or EENE 3 HALF BRIDGE CIRCUIT PM M 4 QUARTER BRIDGE E OBIcCOL UU UE 4 CALIBRATION P 5 SPECIFICATION ee 5 CONTACT INFORMA TION Pro 6 30 04 2008 Page 2 of 6 SGAO1 Strain Gauge Amplifier RACELOGIC Introduction Racelogic s SGAO1 is a twin channel user adjustable strain gauge amplifier Each channel is designed for full bridge operation but can be used with half bridge and quarter bridge load cells if necessary as discussed in the Connection section of this manual Each channel is DC isolated with an output range of 9V and a signal gain adjustable between approximately 25 and 1000 Connection to the SGA01 is made via screw termina
3. ls with mini cable glands to allow wires to be run out of the unit when the lid is in place preventing interference with the screw terminals and the scale and setting adjusters Connection Wires can be run into the Strain Gauge Amplifier using the three mini cables glands This allows the lid to be replaced enabling secure connections to the internal screw terminals without leaving them or the scale and offset adjustment screws exposed This section details connection methods for use with full bridge half bridge and quarter bridge circuits Full Bridge Circuit RACELOGIC Channel B Input DI kel ue E Amplifier Offset Gain RLVB SGA 01 Channel A Input Signal Ground Signal Output C output B Signal 1 SS output A ona Offsct Gain Output A Signal y f When using the SGA in conjunction with a full bridge load cell no additional equipment is required Simply connect the load cell to the SGA as shown in the diagram above 30 04 2008 Page 3 of 6 SGAO1 Strain Gauge Amplifier C RACELOGIC Half Bridge Circuit Addtional resistors fitted to complete bridge When using the SGA with a half bridge load cell two additional resistors must be placed in the circuit The resistors should be rated to the same value as the maximum resistance of the load cell s internal resistors and must be placed as shown in the diagram above Quarter Bridge Circuit Addkional resistors fitted to complete bridge Quark
4. r Bridge Channel B input Losd Coll Power In Oft Gain e 8 Channel A Input Output B Gnd N ERN output B Signal Q Output A Gnd Offest Gain Output A Signal L8 s When using the SGA in conjunction with a quarter bridge load cell three additional resistors must be placed in the circuit These resistors should be rated to the same value as the maximum resistance of the load cell s internal resistors and must be placed according to the diagram above 30 04 2008 Page 4 of 6 SGAO1 Strain Gauge Amplifier RACELOGIC pu ms ES Calibration Calibration of the Strain Gauge Amplifier takes place in two steps or two steps per channel if more than one channel is being used offset calibration and scale calibration First calibrate the offset by subjecting the load cell to the conditions that relate to a zero value typically no load With the required load applied adjust the Offset screw for that channel until the output voltage reads OV Next calibrate the scale by subjecting the load cell to a known non zero value With the required load applied adjust the Scale screw for that channel until the output voltage gives the voltage desired for the applied load Repeat for the second channel if necessary Specification Supply Voltage 6V 18V DC CMRR 90cB typical 77dB minimum Bridge Supply Voltage 5V 2mV Output Range 9V Gain 25 1000 adjustable Operating Temperature 40 C
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