Daytronic AA72-2F010 Bedienungsanleitung
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AA72-2F010
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The Models AA72-2 and 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 Ω or 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 MΩ are 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 analysis of 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-
GRAMMABLE LOW-PASS ACTIVE FILTERING 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
fixed filter 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 ANALOG OUTPUT 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.
GENERAL DESCRIPTION AND SPECIFICATIONS AA72-2/4.1
MODEL AA72-2
MODEL AA72-4
STRAIN GAGE
CONDITIONER CARD
PLEASE NOTE: In this manual, “AA72” will be used to refer to BOTH the two-channel
Model AA72-2 AND the four-channel Model AA72-4, in cases where it is not neces-
sary to distinguish them.
1.E.2.AA72-2/4
SYSTEM 10
ANALOG INPUT CARDS
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | AA72-2F010 |
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