Daytronic IL78A Handleiding

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The Model IL78A is a single-channel conditioner ofphase-sensitive carrier-amplifierdesign.

Intended for applications involving transformer-coupling to the transducer bridge (as with rotary-

transformer torque sensors), this conditioner can also be used in conventional installations when

high sensitivity is required or where the electrical envi

ronment is especially noisy. Responding

only to the modulated carrier frequency, the IL78A rejects extraneous voltages that can cause

errors in DC systems, particularly when there is a need to “blow up” a portion of the transducer

range. User-adjustable phase and symmetry controls are provided.

1GENERALDESCRIPTIONANDSPECIFICATIONS

IN-LINE AC Strain Gage Conditioner

MODELIL78A

AC Strain Gage

C

ONDITIONERModule

IL78A

GENERAL DESCRIPTION ANDSPECIFICATIONSIL78A.1

Top View of the Model IL78A AC Strain Gage Module (cover removed)

AC Strain Gage Phase Operation

Due to theAC modulated aspects of theIL78A AC Voltage excitation circuit, the IL78A8 contains a "PHASE"

adjustment whi

ch aligns the transducer's return output signal to the conditioner's demodulator. When the

demodulator isaligned properly through calibration,maximum amplitude and linearityare achieved.

The Model IL78A's is calibrated by means of a “two-point (dead-weight)” orshunt-calibration

technique, which are outlined in section three. The user can utilizethe shunt calibration method

by adding the correct leaded shunt resistor value from "Cal Sense" to either + Senseor - Sense

depending on the polarity desired.

ShuntOperation:Located between the two screw terminal connectors, t

he 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.

92371.00 rev. B

Product specificaties