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values. Solder two resistors together, then solder the remaining two

resistors together. Next, connect the two junctions together using a

separate wire as shown. There is a good reason for this method of

construction, and it should be followed. Connect the substitute or simu-

lated transducer to the instrument I/O connector using a short 4-wire

cable configuration as shown in Figure 4. Attempt to balance the substi-

tute or simulated transducer. If conditions now appear to be normal, the

transducer or cable is at fault. If the previous difficulties persist, the 3178

is faulty.

Summary of Contents for 3000 series

Page 1: ...MODEL 3178 STRAIN GAGE CONDITIONER SB 5 1 INSTRUCTION MANUAL 3000 Instrument Series...

Page 2: ...reprinted reproduced or used in any form or by any electronic mechanical or other means including photocopying and recording or in any information storage and retrieval system without permission in wr...

Page 3: ...aired with CAL SENSE unconnected at Connector A SHIELD Daytronic 400 Series Transducer Connections 1 A 2 B 3 4 C 9 D A B C EXC EXC SENSE SENSE SIG SIG CAL SENSE B A Extra Wire paired with CAL SENSE un...

Page 4: ...ction 4 Wire Configuration for Cables Shorter Than 20 Feet SENSE EXC SENSE SIG SIG CAL SENSE 1 A 2 B 3 C 4 9 A SHIELD Extra Wire paired with CAL SENSE unconnected at Connector A EXC 6 Wire Configurati...

Page 5: ...DEL 3178 STRAIN GAGE CONDITIONER INSTRUCTION MANUAL Model 3178 Instruction Manual v SB 5 1 Pub No 3178M 5 1 Issued 03 01 Part No 91121 Daytronic Corporation Dayton OH Tel 800 668 4745 www daytronic co...

Page 6: ...This page intentionally blank...

Page 7: ...onditioner 1 2 Instrument Mounting Dimensions 4 3 Instrument Panel Mounting 5 4 I O Wiring 9 5 Front Panel Description 12 6 Block Diagram 17 7 Star Bridge Construction 20 LIST OF TABLES Table Page 1 S...

Page 8: ...ssary balancing and calibration controls and conditions amplifies the applied input to a standard Five Volt Data Signal Level which is the output analog signal level of 3000 Series Instruments Two ana...

Page 9: ...e Analog Outputs Two analog outputs available 0 to 5 volts with 50 overrange 5 milliamperes maximum Bandpass is dc to 2 Hz or dc to 400 Hz Active low pass filters provide for rolloff of 60 dB per deca...

Page 10: ...cteristics Positive realm calibra tion can be remotely checked by means of Remote Cal terminals on the instrument I O connector The 3178 Strain Gage Conditioner is also available in two additional for...

Page 11: ...Model 3178 A Bench Mounting B Rack Mounting C Panel Mounting Figure 2 Instrument Mounting Dimensions 4...

Page 12: ...Daytronic Corporation Figure 3 Instrument Panel Mounting 5...

Page 13: ...the front panel screwdriver adjustments and buttons are accessible These screws give approxi mately 1 8 inch of adjustment consequently this is the maximum panel thickness which should be used CAUTION...

Page 14: ...d even though the transducer calibration data mentions some other resistance value In Section 3 of this manual the tech niques described above are demonstrated If however the installed value of calibr...

Page 15: ...tor Figure 4 indicates three methods of remotely entering the calibration mode external switch transistor or TTL source The Remote Cal function provides a convenient method of periodically monitoring...

Page 16: ...I600 Fig 4 I O Wiring Data See the CORRECTION to Fig 4 in the front of this manual...

Page 17: ...I600 I600 I600 I600 I600 I600 I600 Fig 4 cont d See the CORRECTION to Fig 4 in the front of this manual...

Page 18: ...ALANCE control to obtain the minimum least positive or most nega tive output reading In some instances an integral digital indicator will be used to display the conditioner output Model 3278 or 3378 W...

Page 19: ...rols SPAN Controls The Coarse and Fine SPAN controls are used to set the output to the dead weight value when dead weight calibration is used They can also be used to set the output to the Equivalent...

Page 20: ...h the transducer loaded as in step f adjust the Symmetry control just to the right of the CAL button to obtain a dead weight reading equal to that obtained in step e If dead weight calibration is not...

Page 21: ...ide switch is used to turn ON primary power Overload protection is provided by a 0 25 ampere fuse mounted near the ac connection point When the slide switch is ON primary power is applied to the power...

Page 22: ...the output of the Integrat ing Amplifier changes the resistance of an Automatic Gain Control element FET to return the oscillator amplitude to its nominal value of 2 volts ac The Integrating Amplifier...

Page 23: ...ontacts of the CAL switch Calibration in the positive realm can also be remotely checked When the Remote Cal input at the 3178 I O connector is brought to a zero volt ground level through the action o...

Page 24: ...This page intentionally blank...

Page 25: ...Fig 6 Block Diagram...

Page 26: ...B within a decade of the cutoff frequency 5 VERIFICATION OF NORMAL OPERATION It is the purpose of this section to aid the user in determining in the event of a malfunction to which the Model 3178 is s...

Page 27: ...a transducer and cable known to be in good condition or by simulating a balanced transducer using either a commercially available transducer simulator or the simple star bridge arrangement shown in F...

Page 28: ...ason for this method of construction and it should be followed Connect the substitute or simu lated transducer to the instrument I O connector using a short 4 wire cable configuration as shown in Figu...

Page 29: ...This page intentionally blank...

Page 30: ...Daytronic Corporation Dayton OH 800 668 4745 www daytronic com...

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