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Model 3770

 

DC STRAIN GAGE PANEL METER 

3    

C

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 

Switch 5 - 

enables dummy zero display digit  

XXXXX

0

 

Switch 6 & 7 - 

selects Display Full Scale Range. 

Range will equate to an analog output value of ± 5 Vdc or ± 10 Vdc per Analog Control switch placement. 
Selection is set for 1 count in 5000, 2 counts in 10000 and 5 counts in 20000. 

Analog Zero and Span Adjustments 

Coarse Zero - 

22 Turn potentiometer adjustment for balance control of analog offset signal 

Fine Zero - 

25 Turn potentiometer for fine balance control of analog offset signal  

Coarse Span - 

22 Turn potentiometer adjustment for analog control of gain  

Fine Span - 

25 Turn potentiometer adjustment for analog control of fine gain 

Page 

7

 

Summary of Contents for 3770

Page 1: ...MODEL 3770 DC STRAIN GAGE CONDITIONER SB 1 1 INSTRUCTION MANUAL 3700 Instrument Series...

Page 2: ...of the analog full scale signal The Model 3770 can be either calibrated by the two point dead weight process involving known input parameters or through the Shunt method using front panel push buttons...

Page 3: ...30 ppm C vs Time 10 ppm month Linearity better than 0 03 of full scale 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...

Page 4: ...el Function J1 1 N C No connection J1 2 N C No connection J1 3 HOLD Input Analog Hold command J1 4 TARE Input Analog TARE command J1 5 TARE ENABLE External TARE enable input J1 6 LOGIC COM Logic Commo...

Page 5: ...nd a shorting wire in place of the external shunt resistor position This provides the electrical path for the Calibration Sense line to enable the sensor s internal shunt resistor when the or Shunt Ca...

Page 6: ...rnal or external across the connected four arm bridge sensor for simulated calibration verification check of the sensor s electrical characteristics LOGIC COM R CAL N O Switch J2 HOLD TARE Connections...

Page 7: ...KHz Analog Voltage Output 5 Vdc or 10 Vdc with front panel selectable cutoff filter 2 20 200 Hz Analog Current Output 4 20mA 4 12 20mA at selected cutoff filter SIGNAL SIGNAL SIGNAL SIGNAL SIGNAL SIGN...

Page 8: ...selects Display Full Scale Range Range will equate to an analog output value of 5 Vdc or 10 Vdc per Analog Control switch placement Selection is set for 1 count in 5000 2 counts in 10000 and 5 counts...

Page 9: ...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 th...

Page 10: ...ion voltage The full scale analog output will be 5 000 Vdc The current output will be set for 4 ma zero and 20 ma will positive full scale The analog low pass filter will be set for 20 Hz Shunt calibr...

Page 11: ...nse leads of the bridge CAL Negative Calibration Activates the SHUNT Negative by switching in the external or internal shunt calibration resistor across the Cal Sense and Sense leads of the bridge TAR...

Page 12: ...t Note that changes in Span Gain will affect Zero Span and Zero re adjustments may need to be repeated to obtain the desired reading Note that the 3770 meter also has independent display adjustment ca...

Page 13: ...potentiometers fully CW Coarse is 22 turns Fine is 25 turns then reverse direction CCW Coarse 11 turns and Fine 13 turns to obtain mid authority of the controls Typically this is done on initial cali...

Page 14: ...scale analog output signal will be 5 VDC or 10 VDC as selected by the Analog Controls of the unit To accomplish the display adjustment change the user would first set the desired display range and dec...

Page 15: ...a factor of 2 Wide Span Position SPAN Low mV V SPAN High mV V 0 3 90 5 80 1 3 30 4 90 2 2 90 4 20 3 2 50 3 60 4 2 10 3 10 5 1 80 2 70 6 1 50 2 30 7 1 30 1 90 8 1 10 1 70 9 1 00 1 40 A 0 84 1 20 B 0 72...

Page 16: ...hase price to the Buyer ANY PRODUCT FOUND TO BE DAMAGED THROUGH CUSTOMER NEGLIGENCE OR MISUSE MAY BE EXCLUDED FROM ANY AND ALL POLICIES CONTAINED IN THIS DOCUMENT ALL EQUIPMENT TO BE REPAIRED OR REPLA...

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