Daytronic AA72-4F010 Bedienungsanleitung
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AA72-4F010
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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
When connected to an optional Model 10CJB-2 Dual Bridge Completion Card (or
equivalent circuitry supplied by the user), the AA72 can accept input from a two-wire
1/4-bridge, three-wire 1/4-bridge, 1/2-bridge, or full-bridge strain gage configuration.
See Section 4 for details.
The AA72 is manufactured using the latest surface-mount technology, resulting in the
highest immunity to shock and vibration. As explained in Section 2, I/O connections
are via secure, clearly labelled screw terminals in a special AA72 CONNECTOR
ASSEMBLY.
Fig. 1 shows the stand-off circuit boards (or “tiles”) that provide the analog filtering for
an AA72 card’s data channels.
WARNING
THE CONDITIONER TILE FOR CHANNELS 3 AND 4 OF A MODEL AA72-4 IS TO BE
INSTALLED OR REMOVED O
NLY BY A QUALIFIED TECHNICIAN, SINCE SUBSEQUENT
REALIGNMENT OF THE AA72 CARD IS REQUIRED.
FILTER TILES, HOWEVER, MAY
BE INSTALLED OR REMOVED BY THE USER, IN THE FIELD. CONTACT THE
DAYTRONIC SERVICE DEPARTMENT FOR COMPLETE INSTRUCTIONS.
THE FOLLOWING
AA72-2 / AA72-4 VERSIONS ARE CURRENTLY AVAILABLE:
• Model AA72-2F010—Two input channels, with FIXED 10-Hz FILTERING for each
• Model AA72-2F050—Two input channels, with FIXED 50-Hz FILTERING for each
• Model AA72-2F1—Two input channels, with “F1” PROGRAMMABLE FILTERING for
each
• Model AA72-2F2—Two input channels, with “F2” PROGRAMMABLE FILTERING for
each
• Model AA72-4F010—Four input channels, with FIXED 10-Hz FILTERING for each
• Model AA72-4F050—Four input channels, with FIXED 50-Hz FILTERING for each
• Model AA72-4F1—Four input channels, with “F1” PROGRAMMABLE FILTERING for
each
• Model AA72-4F2—Four input channels, with “F2” PROGRAMMABLE FILTERING for
each
AA72-2/4.2 GENERAL DESCRIPTION AND SPECIFICATIONS
AA72-2 / AA72-4 DUAL / QUAD DC STRAIN GAGE CARD
Conditioner Tile
Chans. 3 & 4
(Model AA72-4 Only)
Filter
Chans.
3 & 4
(Model
AA72-4
Only)
Filter
Chans.
1 & 2
I/O Connector
FOR FUTURE USE
Fig. 1 Model AA72-2 / AA72-4 Modular Card Components
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | AA72-4F010 |
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