Daytronic AA72-4F2 Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

The Models AA72-2and AA72-4 are general-purpose two- and four-channel condi-

tioners (respectively) for use with

DC-excited load cells, pressure sensors, and

any other conventional strain gage transducer

employing a 4-arm bridge of nomi-

nal 350 Ωor higher, with a full-scale range of 0.75, 1.50, or 3.00 mV/V.

The AA72’s advanced design techniques overcome errors that traditionally plague the

strain-gage conditioning process. Separate excitation for each channel uses remote

sensing of bridge voltage and is slaved to a common System Reference Voltage. The

result is consistently stable ratiometric measurement, unaffected by possible power-

supply drift. Input impedances in excess of 10,000 MΩare presented to signal leads

to eliminate cable resistance as a source of error. Allowable cable length has virtually

no practical limits.

The AA72 features selectable per-channel excitation (1, 5, or 10 V-DC). Using low

excitation helps reduce gage heating effects in

stress analysisof materials with low

thermal conductivity. Table 1 gives the full-scale mV/V ranges that correspond to

each excitation level.

Like most Daytronic “Advanced Analog”(“AA”) cards, the AA72 features optional PRO-

GRAMMABLELOW-PASSACTIVEFILTERING for the removal of unwanted high-fre-

quency measurement-signal components. Selectable analog filtering is offered for

the AA72 either from 0.2 through 200 Hz in 16 steps (“F1” filtering) or from 2 through

2000 Hz in 16 steps (“F2” filtering). Or, if desired, a

fixedfilter of either 10 or 50 Hz for

all channels may be specified at the time of order. When the AA72 is used in System

10, its filter cutoff values are set by means of an on-board 16-position switch for each

channel.

A nominal ±5-V ANALOGOUTPUT is produced by each active AA72 input channel, for

purposes of real-time signal monitoring. Each of these “Auxiliary Outputs” is available

on a corresponding mainframe wire-wrap pin. Each output may be individually set, if

desired, to represent the

prefiltered value of the corresponding input. When such is

the case, the output bandwidth is limited only by that of the AA72 card (see “Specifica-

tions”).

A convenient shunt calibration technique is provided. Each channel’s shunt resistor

may be switched in and out by software command or by means of logic-level inputs

through the rear I/O CONNECTOR.

GENERALDESCRIPTIONANDSPECIFICATIONSAA72-2/4.1

MODELAA72-2

MODELAA72-4

STRAINGAGE

CONDITIONERCARD

PLEASENOTE: In this manual, “AA72” will be used to refer to BOTH the two-channel

Model AA72-2AND the four-channel Model AA72-4, in cases where it is not neces-

sary to distinguish them.

1.E.2.AA72-2/4

SYSTEM10

ANALOGINPUTCARDS

Product specificaties