Daytronic 10A72-2C Handleiding

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1GENERALDESCRIPTIONANDSPECIFICATIONS

The Model 10A72-2C is a general-purpose two-channel conditioner for use with DC-

excited load cells, pressure sensors, and any other conventional strain gage

transducer

employing a 4-arm bridge of nominal 350 Ωor higher, with a full-scale

range of 0.75, 1.50, or 3.00 mV/V.

The 10A72-2C’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 10A72-2C 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.

In addition, the 10A72-2C lets the user select either 10-Hz or 100-Hz analog filtering for

each input channel. The wideband (100-Hz) filter is specially designed for measure-

ment of a highly dynamic input signal.

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.

When connected to an optional

Model 10CJB-2 Dual Bridge Completion Card (or

equivalent circuitry supplied by the user*), the 10A72-2C can accept input from a two-

wire 1/4-bridge, three-wire 1/4-bridge, 1/2-bridge, or full-bridge strain gage configura-

tion. See Section 4 for details.

ADDITIONAL10A72-2C SPECIFICATIONS

Transducer Types

: Conventional 4-arm strain gage bridges, nominal 350 ohms (or

higher); 1/4- and 1/2-bridge gage configurations can be accommodated by means

of the

Model 10CJB-2 Dual Bridge Completion Carddescribed in Section 4 (or

equivalent external bridge-completion circuitry supplied by the user)*

(cont’d)

*When conditioning input from a 1/4-bridge or 1/2-bridge strain gage configuration, a 10A72-2C

channel should be set to “Gage” mode (see Section 3.a). If you wish to provide your own

bridge-completion circuitry, you should contact the factory for instructions on connections and

calibration.

MODEL10A72-2C

ENHANCEDDUALSTRAINGAGE

CONDITIONERCARD

GENERALDESCRIPTIONANDSPECIFICATIONS10A72-2C.1

1.E.2.10A72-2C

SYSTEM10

ANALOGINPUTCARDS

Product specificaties