Daytronic 10A73-4 Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

Intended primarily for stress analysis applications, the Model 10A73-4 receives and

conditions up to

four independent inputs from one-arm (1/4-bridge), two-arm (1/2-

bridge), and four-arm (full-bridge)

strain gage configurations attached directly to the

stressed material.

If you are measuring strain by means of a one-arm (1/4-bridge) strain gage configura-

tion, BE SURE TO STUDY SECTION 4 FOR A DISCUSSION OF “LEAD WIRE AND NON-

LINEARITY EFFECTS WITH QUARTER-BRIDGE STRAIN GAGE CONFIGURATION.”

Unless all four inputs originate from full-bridge transducers, the 10A73-4 requires

external completion of each strain gage input to

full bridge, by means of one of the fol-

lowing:

•aSystem 10 Bridge Completion Connector—one of the following models:

—

10QBC-4-120 for 2- or 3-wire 120-Ωquarter-bridgeconnections

—

10QBC-4-350 for 2- or 3-wire 350-Ωquarter-bridgeconnections

—

10QBC-4-1K for 2- or 3-wire1000-Ωquarter-bridge connections

—

10HBC-4 for 4- or 6-wire half-bridge connections

—

10FBC-4 for 5-wire full-bridge connections

•a Daytronic Model 10CJB-4 Quad Bridge Completion Card(described in Sec-

tion 2.b)

1

;

•equivalent circuitry supplied by the user

2

When the 10A73-4 is used with one of the System 10 Bridge Completion Connectors

listed above, the excitation level is

fixed at 5 V-DC. In the absence of a Bridge Com-

pletion Connector—whether or not the

Model 10CJB-4is used—the 10A73-4 provides

selectable low-level excitation (1, 2, or 5 V-DC) to help reduce gage heating effects in

materials with low thermal conductivity.

3

However, the selection of excitation level for

the 10A73-4 is not “per channel”;

the same level applies to all four 10A73-4 channels.

See Section 3.a for details.

As explained in Section 3.b, the 10A73-4 can be quickly calibrated either through

“calculated” calibration—involving application of the

MVVcommand—or through a

convenient shunt technique. Unless a System 10 Bridge Completion Connector is

being used with the 10A73-4, all four shunt resistors may be switched in and out

simultaneously by means of logic-level inputs through the rear I/O CONNECTOR.

1

The 10CJB-4 contains a switch for easy selection of the common excitation level.

2

If you wish to provide your own bridge-completion circuitry, you should contact the factory for

instructions on connections and calibration.

3

A special modification must be made to the 10A73-4 card to allow selectable excitation when a

System 10 Bridge Completion Connector is attached.

MODEL10A73-4

1/2 & 1/4 BRIDGESTRAINGAGE

CONDITIONERCARD

GENERALDESCRIPTIONANDSPECIFICATIONS10A73-4.1

1.E.2.10A73-4

SYSTEM10

ANALOGINPUTCARDS

Product specificaties