DayTronic 3000PLUS Instruction Manual - Page 6

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cially noisy. Responding only to the modulated carrier

frequency, the module 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.

The conditioner's advanced analog design directly

addresses the problem of measurement inaccuracy in

industrial environments of high electromechanical

noise. Exceptional signal stability and accuracy over a

remarkably wide range of sensor inputs are achieved

through

• regulated, remotely sensed AC excitation

• precise linearity / symmetry correction and signal

phase adjustment via software commands

• high-stability amplification

• configurable low-pass active filtering

• "absolute" and "two-point" software-based

calibration

• effective signal isolation & ESD protection

Plugging into the rear of the 3000PLUS meter, the 5D78

connects directly to its source strain gage sensor via

simple screw-terminal pinout (see Fig. 3). High output

accuracy over a wide temperature range guarantees

repeatable sensor signal integrity. For steady indication

and smooth, dependable control action, the conditioner

provides a true average value of the measured variable,

even in the face of substantial dynamic content.

The 5D78 features

• Powerful user-selectable low-pass active filter-

ing for removal of unwanted high-frequency mea-

surement-signal components and the elimination of

aliasing errors

• High noise rejection, eliminating errors from com-

mon-mode pickup and ground-loop coupling, with

1500 VAC isolation between input and output termi-

nals and between I/O and power supply / communi-

cations terminals

* Employing a low-capacitance cable will minimize the effects on

overall offset and span. See note (**) on page 1.4.

3000PLUS

5D78 I

WITH

1. I

NTRODUCTION

• High ESD immunity and extensive EMI protec-

tion further assure data integrity in harsh industrial

environments

Because of normal cable loading effects, it is a practical

necessity to calibrate any AC TORQUE SENSOR/

CABLE/INSTRUMENT system after installation, using a

known input standard. The "ABSOLUTE" CALIBRATION

method described in Sections 3.B and 4.E will normally

yield a very good first approximation for a sensor/

cable/5D78 system (depending, of course, on actual

cable length and capacitance).* However, absolute cal-

ibration of a 3000PLUS with installed Model 5D78

should always be followed by a conventional "in place"

TWO-POINT (DEADWEIGHT) CALIBRATION, for opti-

mum data integrity.

To perform initial ABSOLUTE CALIBRATION, you need

only use the front-panel menu or configuration software

to specify the desired relationship between the mod-

ule's measured engineering units and its ±5-VDC out-

put, given the full-scale input range for which it is

currently set and the source transducer's known full-

scale rating and sensitivity. A zero offset term may also

be entered, expressed either in engineering units or

millivolts.

TWO-POINT (DEADWEIGHT) CALIBRATION requires

the application of two independently and accurately

known values of input loading ("ZERO" and "SPAN"), fol-

lowing the entry of a phase shift adjustment. Activation

of a user-supplied shunt calibration resistor is provided

(for either a positive or negative upscale reading) for

use in the two-point method, if desired. Internal sym-

metry trimming is available for negative-domain slope

adjustments of up to ±2% of full scale, along with both

positive and negative midscale linearity correction.

NSTRUCTION

ANUAL V

. SB.3

3KP78 - 1.2