Daytronic 10A74-4C Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

Intended primarily for stress analysis applications, the Model 10A74-4C 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.”

To minimize “time-skew” effects, each 10A74-4C input has a separate TRACK/HOLD

circuit. Upon application of a “HOLD” command, the channel will instantly freeze its

present value in analog memory until application of a “TRACK” command, whereupon

normal tracking of the input signal is resumed. By applying a “HOLD” command

simultaneously to all four channels, the user can be assured of a set of readings

coherent to within a few microseconds.

As explained in Section 3.e, the TRACK/HOLD function is normally controlled through

an external logic signal to the 10A74-4C’s rear I/O connector, when a System 10

Bridge Completion Connector or the optional Model 10VAC is not being used. When

the conditioner is used in a “B-sized” System 10 mainframe (only), the TRACK/HOLD

function may be alternatively controlled through an optional Model 10A1 Control Sig-

nal Card mounted in the same “A-card” rack.* Setup of the 10A1 for use with the

10A74-4C is discussed in Section 3.b.

Unless all four inputs originate from full-bridge transducers, the 10A74-4C 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);

•equivalent circuitry supplied by the user**

*In System 10, the Model 10A1 uses the same system bus as the Model 10A11 Thermocouple

Processor Card; therefore, a “10A” THERMOCOUPLE CONDITIONER such as the Model

10A9-8C or 10A10-4 cannot be used in the same System 10 “A-card” rack as a Model 10A1.

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

instructions on connections and calibration.

MODEL10A74-4C

QUADSTRAINGAGETRACK-HOLD

CONDITIONERCARD

GENERALDESCRIPTIONANDSPECIFICATIONS10A74-4C.1

1.E.2.10A74-4C

SYSTEM10

ANALOGINPUTCARDS

Product specificaties