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DayTronic 3770 Instruction Manual

Dc strain gage panel meter
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MODEL
3770
DC STRAIN GAGE CONDITIONER
INSTRUCTION MANUAL
3700
Instrument Series
SB.1.1

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Summary of Contents for DayTronic 3770

  • Page 1 SB.1.1 MODEL 3770 DC STRAIN GAGE CONDITIONER INSTRUCTION MANUAL 3700 Instrument Series...
  • Page 2 120 to 10K Ohm transducers with mV/V ratings between 0.5 and 10.0 mV/V full scale. The 3770 will supply excitation, conditioning and provide a calibrated Engineering Unit's display and analog output signals for the measurement of force, load, torque, pressure and other parameters associated with DC based full bridge sensors.

  • Page 3: Specifications

    Filter: 3-pole modified Butterworth; 3 dB down at 2 Hz, 20 Hz or 200 Hz; selectable. Fast output always enabled, 5 KHz response (J3 Pin 3). Step-Response Settling Times for the 3770 (in milliseconds) 3db Frequency To within 1% within .1% within .02%...

  • Page 4: Rear Panel Connections

    O N N E C T I O N S The Model 3770 I/O CONNECTIONS are via removable screw terminals which will accept wire sizes from AWG 12 to 26. NOTE: The recommended transducer cabling would be eight wire, twisted pair, individually shielded - wired as indicated (Fig.
  • Page 5 When an externally installed resistor is used, the ANALOG CONTROL switch 5 is required to be in the External position (Switch 5 DOWN). The 3770 unit comes with an internally installed 59K Ohm resistor, as standard, and Note: enabled when the front panel ANALOG CONTROL Switch# 5 is in the Internal position (Switch 5 UP).
  • Page 6 Model 3770 DC STRAIN GAGE PANEL METER O N N E C T I O N S J1 – Shunt Command Connections. Connection is used to activate the positive or negative Shunt calibration command from the rear panel. When the + or – R CAL terminal is connected to LOGIC COM via a switch or relay, the installed Shunt resistor will be connected across + Signal and + Sense or –...
  • Page 7 Model 3770 DC STRAIN GAGE PANEL METER O N N E C T I O N S Fig. 6 - Transducer Cabling – DC Strain Gage- J2 + EXCITATION - EXCITATION + SENSE - SENSE + SIGNAL - SIGNAL CAL SENSE...
  • Page 8 Model 3770 DC STRAIN GAGE PANEL METER O N T R O L S Display Range and Decimal Point Selection Switch 1 - selects decimal point for position X.XXXXX Switch 2 - selects decimal point for position XX.XXXX Switch 3 - selects decimal point for position XXX.XXX Switch 4 - selects decimal point for position XXXX.XX...
  • Page 9 Wide Span - 16 position switch to adjust wide range gain for 0.5 to 10 mV/V sensors Display Span Adjustments Used to adjust the digital readout of the 3770 meter, the user calibrates the analog output for a specific span value and then adjusts the readout for proper engineering units display. “OFF” position indicator defines the default position.
  • Page 10 Model 3770 DC STRAIN GAGE PANEL METER C o n t r o l s Analog Control Settings Front panel controls configure the Signal conditioner section for excitation level, mode of the analog output signal, low pass filter characteristics and shunt calibration being internal or external.
  • Page 11 Model 3770 DC STRAIN GAGE PANEL METER C o n t r o l s Analog Symmetry, + CAL, - CAL, TARE Symmetry - Adjust the negative gain slope for symmetrical analog adjustment and display reading with reference to the positive span value. 20 Turn potentiometer, with approx. ± 2%...
  • Page 12 DC STRAIN GAGE PANEL METER CALIBRATION This section contains the instructions for calibrating the 3770. Included is a functional description of the instrument front-panel (see Page 1). To perform calibration, proceed as follows. Connect Sensor and Analog terminals as required. Connect and apply power to the unit. The front- ( a ) panel digital display should light indicating the application of the AC input power.
  • Page 13 Phillip head screws. Note: The 3770 unit has an internal 59K Shunt resistor installed within the unit. If a different resistor value is to be used to correspond to the transducer’s calibration sheet; install the resistor on the rear J1 terminals provided and place the Analog Control Switch 5 to External.

  • Page 14: Display Calibration

    When + CAL is depressed, input sensor is at zero, display is on the 5000 range, adjust the readout for 2472 Display Calibration he 3770 instrument display has separate adjustment controls that are independent of the analog controls which allow the user to alter the display reading to a value that is suited for the engineering units display reading required.
  • Page 15 DC Strain Gage Sensors will typically specify their electrical sensitivity in mV/V for traditional foil gage transducers or in mV full scale for semiconductor type sensors; either type will function with the 3770 unit as dictated by the excitation voltage needed along with the full scale output of the sensor. The 3770 has selectable excitation of 5 and 10 Vdc and a maximum specified input of 50.0 mV (with 20% over-range) into the meter.

  • Page 16: Product Warranty And Repair

    DC Strain gage Panel Meter Product Warranty and Repair rial Daytronic Corporation warrants its products to be free from defects in mate workmanship, under normal and proper use in accordance with our instructions, for the period of time specified below. Our liability under such...