The Model IL70A is a single-channel instrument which is easily configured, rugged, analog based
signal conditioner made to operate with traditional Wheatstone mv/V stain gage bridge sensors
used to measure force, pressure, torque and other DC strain gage related measurements. The Model
IL70A has an extremely wide DC power input range with user selectable gain, zero and anaolg output
making it adaptable to any users sensor application that requires stable, repeatable and noise free
analog signals for control or data acquisition.
1
G
ENERAL
D
ESCRIPTION AND
S
PECIFICATIONS
IN-LINE DC Strain Gage Conditioner
M
ODEL
IL70A
DC Strain Gage
C
ONDITIONER
Module
IL70A
GENERAL DESCRIPTION AND SPECIFICATIONS IL70A.1
Top View of the Model IL70A DC Strain Gage Module (cover removed)
DC Strain Gage Symmetry Operation:
For applications requiring precision in both tension and compression (CW & CCW for
torque cells), the IL70A contains a symmetry adjustment which corrects for negative span or slope of the transducer.
The Model IL70A is best calibrated by means of a “two-point (dead-weight)” or shunt-calibration
technique, which is outlined in section three. The supplied calibration resistor is 59 kilohms, 1%
which is located internally to the IL70A
pcb circuit.
Shunt
Operation:
Located between the two screw terminal connectors, the IL70A contains a Shunt resistor jumper
selection. "EXT" is for an external - user installed shunt or "INT" for the internal - built in - 59K Ohm shunt. Installing the jumper
enables the selected feature. For an external shunt resistor, install the leaded resistor between the "Cal Sense" (pin 7) terminal
and either the + Signal (pin 5) or the - Signal (pin 6) terminals. Use the SW4 "Shunt" button to engage the shunt resistor across
the selected side of the bridge or "SHP or "SHN" logic input lines. For transducers with an installed shunt resistor, place the
jumper on the "EXT" teminals and wire the "Cal Sense" line to the transducer's shunt connector pin.
9237
5
.00 rev.
B
