Daytronic AA30-4F1 Bedienungsanleitung
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AA30-4F1
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The AA30-4 is a four-channel conditioner for measurement of displacement, force,
pressure, and other parameters obtained with a
linear variable differential trans-
former (LVDT)
or variable reluctance transducer.
Based on the
synchronous carrier-demodulator principle, the AA30-4 supplies regu-
lated, remotely sensed AC excitation for each active transducer channel—thus allow-
ing direct measurement of
thickness (when two separate inputs are summed) or of
taper (when their difference is calculated). It then demodulates, filters, and amplifies
the resulting signals to produce system outputs precisely proportional to LVDT core
displacement. The AA30-4 automatically adjusts to the signal phase shift of the trans-
ducer in use, thereby insuring optimum sensitivity and linearity.
Unlike the Model 10A30-2C or 10A31-4, the Model AA30-4 does
not require special
cabling to accommodate “long-stroke” LVDT's (full-scale range of ±1 inch or greater).
Also, the AA30-4's enhanced linearity correction lets it accommodate a wider range of
displacement transducers.
Like most Daytronic “Advanced Analog” (“AA”) cards, the AA30-4 features optional
PROGRAMMABLE LOW-PASS ACTIVE FILTERING for the removal of unwanted high-
frequency measurement-signal components. Selectable analog filtering is offered for
the AA30-4 from 0.2 through 200 Hz in 16 steps—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 AA30-4 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 AA30-4 input channel,
for purposes of real-time signal monitoring. Each of these “Auxiliary Outputs” is avail-
able on a corresponding mainframe wire-wrap pin. Each output may be individually
set, if desired, to represent the
prefiltered value of the corresponding input.*
Separate excitation for each channel uses remote sensing of excitation voltage and is
slaved to a common System Reference Voltage. The result is consistently stable ratio-
metric measurement, unaffected by possible power-supply drift. A “Slave Excitation”
input is available if the user wishes to provide an external excitation voltage and fre-
quency instead of the AA30-4's internal supply.**
MODEL AA30-4
LVDT
C
ONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS AA30-4.1
* In the case of the Model AA30-4, an active 300-Hz filter is applied to each input channel as part
of the standard signal demodulation process, prior to delivery of the signal either to an
installed filter tile or to a wire-wrap pin. See “Specifications” for response characteristics of the
“prefiltered” AA30-4 output.
** The external excitation input must be 2 to 3.5 V-AC (rms) and 2 to 6 kHz, referenced to “center
wire” (Signal Common). See Section 3.a for details.
1.E.2.AA30-4
SYSTEM 10
ANALOG INPUT CARDS
The AA30-4 is manufactured using the latest surface-mount technology, resulting in
the highest immunity to shock and vibration. As explained in Section 2, I/O connec-
tions are via secure, clearly labelled screw terminals in a special AA30-4 CONNEC-
TOR ASSEMBLY.
Fig. 1 shows the stand-off circuit boards (or “tiles”) that provide the analog filtering for
an AA30-4 card’s data channels.
FILTER TILES (ONLY) MAY BE INSTALLED OR
REMOVED BY THE USER, IN THE FIELD. CONTACT THE DAYTRONIC SERVICE
DEPARTMENT FOR COMPLETE INSTRUCTIONS.
THE FOLLOWING
AA30-4 VERSIONS ARE CURRENTLY AVAILABLE:
• Model AA30-4F010—Four input channels, with FIXED 10-Hz FILTERING for each
• Model AA30-4F050—Four input channels, with FIXED 50-Hz FILTERING for each
• Model AA30-4F1—Four input channels, with “F1” PROGRAMMABLE FILTERING for
each*
ADDITIONAL AA30-4 SPECIFICATIONS
Transducer Types
: 5- or 7-wire LVDT's capable of 3280-Hz operation and having pri-
mary impedance of 80 Ω or greater (all Daytronic LVDT transducers are suitable);
3- or 5-wire variable reluctance transducers
Input Ranges (rms, full-scale): Automatically selected—on an individual channel
basis—when the channel is configured; for System 10 channel “type” codes
assigned to AA30-4 data channels, see Table 1, below
Standard: 70, 140, 280, or 410 mV/V
Long-Stroke: 820 mV/V or 1.64 V/V
On-Board Excitation (per channel): Nominal 3 V-AC (rms) at 3280 Hz; 37.5 mA
(rms), maximum, for each voltage, subject to 120 mA total current draw for all 4
channels
Amplifier (per channel):
Normal-Mode Range: ±6 V operating; ±12 V without instrument damage
Common-Mode Range: ±5 V operating; ±12 V without instrument damage
Common-Mode Rejection Ratio: DC: infinite; at 60 Hz: -120 dB; at 3 kHz: -60 dB
Input Impedance: Differential: 200 kΩ; Common-Mode: 125 kΩ
Offset: Initial: ±1% of full scale; vs. temperature: ±0.20 ppm/°C; vs. time: ±0.01% of full
scale/month
Gain Accuracy: ±0.02% of full scale, following calibration
AA30-4.2 GENERAL DESCRIPTION AND SPECIFICATIONS
AA30-4 QUAD LVDT CARD
Filter
Chans.
3 & 4
Filter
Chans.
1 & 2
I/O Connector
FOR FUTURE USE
Fig. 1 Model AA30-4 Modular Card Components
*“F1” is currently the only programmable filter tile that applies to the Model AA30-4.
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | AA30-4F1 |
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