DayTronic 5M78 Manual

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5M78

DIN AC Strain Gage Conditioner

ENERAL

The Model 5M78 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 5M78 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 5M78's is calibrated by means of a "two-point (dead-weight)" or

shunt-calibration technique, which are outlined in section three. The supplied shunt

calibration resistor is 59 kilohms, 1% which is located internally to the 5M78 case.

View of Side Label of the Model 5M78 AC Strain Gage Module

92342.00

AC Strain Gage

ESCRIPTION AND

ENERAL

ODEL

ONDITIONER

PECIFICATIONS

Model 5M78 AC Strain Gage Module

Access switch settings via the front

panel of the 5M78 by gently pulling the

clear plastic cover (from the bottom

side) so the cover rotates open from

the top. Use a small tool or finger to

place the switches to the left or right

position as you face the front of the

module. This process can be done with

or without power to the unit. Once

completed, return the cover to the

original position.

AC Strain Gage Phase Operation

Due to the AC modulated aspects of the

5M78 AC Voltage excitation circuit, the 5M78

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

accuracy are achieved.

ESCRIPTION AND

PECIFICATIONS

1.A.1.5M78

5M78

Module

5M78. 1