DayTronic IL78A Manual

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IL78A

IN-LINE AC Strain Gage Conditioner

ENERAL

The Model IL78A is a single-channel conditioner of phase-sensitive carrier-amplifier design.

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 environment 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.

The Model IL78A's is calibrated by means of a "two-point (dead-weight)" or shunt-calibration

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

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

depending on the polarity desired.

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

Shunt Operation:

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.

AC Strain Gage Phase Operation

Due to the AC modulated aspects of the IL78A AC Voltage excitation circuit, the IL78A8 contains a "PHASE"

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

demodulator is aligned properly through calibration, maximum amplitude and linearity are achieved.

92371.00 rev. B

ESCRIPTION AND

Located between the two screw terminal connectors, the IL70A contains a Shunt resistor jumper

GENERAL DESCRIPTION AND SPECIFICATIONS

ODEL

AC Strain Gage

ONDITIONER

PECIFICATIONS

IL78A

Module

IL78A.1