Model 3770
DC STRAIN GAGE PANEL METER
3770
1.A.0.3770
1
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E N E R A L
D
E S C R I P T I O N A N D
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P E C I F I C A T I O N S
The Model 3770 is a single
-
channel panel instrument for traditional wheat-stone bridge type
sensors; intended for applications involving conventional full arm bridges from 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. The 3770 is front panel configurable with user selectable wide
gain, zero, symmetry, and selectable analog output of voltage and current signals. Display is user
configured and can be independently adjustable for engineering unit scaling up to ± 199950
independent 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 or rear
connections for simulated calibration using a known resistance provided internally by the 3770
or through a user installed resistor value.
FRONT PANEL VIEW OF 3770 CONTROLS
(Front Display Cover Removed)
1 2 3 4 5 6 7
C
F
C
C
F
F
1 . X . X . X . X 0
FINE ADJUST
ZERO
SPAN
1. X. X. X. X 0
ZERO
SPAN
WIDE ADJUST
5000
10000
20000
SYM
DISPLAY SPAN
TARE
+ CAL - CAL
1 2 3 4 5 6 7
ANALOG CTRL
FINE ADJUST
COARSE ZERO
FINE ZERO
COARSE SPAN
FINE SPAN
WIDE ADJUST
ZERO
SPAN
DISPLAY CONFIGURATION
Sw 1,2,3,4 DECIMAL POINT PLACEMENT
Sw 5
DUMMY ZERO
Sw 6 & 7 DISPLAY RESOLUTION
+ CAL
Shunt Positive
- CAL
Shunt Negative
TARE
ANALOG CONTROL SETTINGS
1 – VOLTAGE OUTPUT – 5.0 or 10.0 VDC
2 - CURRENT OUTPUT – 4-20 mA
3 - ANALOG FILTER – 20 / 200 Hz
4 - ANALOG FILTER – 20 / 2 Hz
5 - SHUNT – INTERNAL or EXTERNAL
6 - EXCITATION VOLTAGE - 10 or 5 VDC
7 - Not Used
DISPLAY SPAN
COARSE
FINE
SYMMETRY
OFF
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