Daytronic AA41-2F1 Bedienungsanleitung
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AA41-2F1
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1 GENERAL DESCRIPTION AND SPECIFICATIONS
The Models AA41-2 and AA41-4 are two- and four-channel conditioners (respectively)
for measuring rpm, flow, and other phenomena that can be sensed by pulse trans-
former transducers with 2-wire isolated windings (tachometer pickups, turbine
flowmeters, etc.), transistor or logic-circuit drivers, “zero-velocity” (true digital output)
sensors, and similar
frequency- generating transducers.
The AA41 accepts a wide range of waveshapes and voltage levels. A “Smart Schmitt”
threshold level for each input channel may be individually selected via internal jumper
connections, depending on the expected peak voltage input: 0.1-2 V; 0.5-10 V; 2.5-50
V; or 10-200 V. This ensures reliable triggering when the input is at the low end of the
voltage range. All ranges are protected against an overload of up to 200 V. Nominal
±5 V-DC excitation is supplied for use with a “zero-velocity” sensor.
Standard AA-card “F1” programmable filter tiles let you tailor the dynamic frequency
range and signal response of each AA41 channel to your application’s requirements.*
Setting a frequency channel’s programmable filter to the 1.6-Hz cutoff provides the fol-
lowing input ranges:
• 10% to 100% of full scale for a range of 250 or 500 Hz
• 2% to 100% of full scale for a range of 1 or 2 kHz
• 1% to 100% of full scale for a range of 4, 8, 16, or 32 kHz
If a faster response is more important than dynamic range, you may select a higher
“F1” bandwidth value (see Table 2). However, programmable filter settings above 25
Hz are not recommended for use with the AA41, because of inadequate usable
dynamic frequency range. When the card is used in System 10, its filter cutoff values
are set by means of an on-board 16-position switch for each channel.
Capacitive coupling of 0.1 or 10 microfarads is provided for low-frequency inputs, to
eliminate false triggering by signal noise and/or any positive or negative DC offset that
exists for the frequency signal.** A special trigger-level control guarantees reliable
triggering when the input is at the low end of the frequency range, while a precise
MODEL AA41-2
MODEL AA41-4
FREQUENCY INPUT
CONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS AA41-2/4.1
PLEASE NOTE: In this manual, “AA41” will be used to refer to BOTH the two-channel
Model AA41-2 AND the four-channel Model AA41-4, in cases where it is not neces-
sary to distinguish them.
*Or, if desired, a fixed filter of either 10 or 50 Hz for all channels may be specified at the time of
order.
** Noise suppression is always recommended when using a magnetic pickup as the frequency
source.
1.E.2.AA41-2/4
SYSTEM 10
ANALOG INPUT CARDS
2.4576-MHz crystal frequency reference ensures accuracy of all calibration, whether
“CALCULATED” or “TWO-POINT (DEADWEIGHT).”
A nominal ±5-V ANALOG OUTPUT is produced by each active AA41 input channel, for
purposes of real-time signal monitoring. Each of these “Auxiliary Outputs” is available
on a corresponding mainframe wire-wrap pin. Note that the AA41’s Auxiliary Outputs
represent
filtered (“postfilter”) channel outputs only (unlike most other “AA” cards).
The AA41 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 AA41 CONNECTOR
ASSEMBLY.
Fig. 1 shows the stand-off circuit boards (or “tiles”) that provide the analog filtering for
an AA41 card’s data channels.
WARNING
THE CONDITIONER TILE FOR CHANNELS 3 AND 4 OF A MODEL AA41-4 IS TO BE
INSTALLED OR REMOVED O
NLY BY A QUALIFIED TECHNICIAN, SINCE SUBSEQUENT
REALIGNMENT OF THE AA41 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
AA41-2 / AA41-4 VERSIONS ARE CURRENTLY AVAILABLE:
• Model AA41-2F010—Two input channels, with FIXED 10-Hz FILTERING for each
• Model AA41-2F050—Two input channels, with FIXED 50-Hz FILTERING for each
• Model AA41-2F1—Two input channels, with “F1” PROGRAMMABLE FILTERING for
each*
• Model AA41-4F010—Four input channels, with FIXED 10-Hz FILTERING for each
• Model AA41-4F050—Four input channels, with FIXED 50-Hz FILTERING for each
• Model AA41-4F1—Four input channels, with “F1” PROGRAMMABLE FILTERING for
each*
AA41-2/4.2 GENERAL DESCRIPTION AND SPECIFICATIONS
AA41-2 / AA41-4 DUAL / QUAD FREQUENCY CARD
Conditioner Tile
Chans. 3 & 4
(Model AA41-4 Only)
Filter
Chans.
3 & 4
(Model
AA41-4
Only)
Filter
Chans.
1 & 2
I/O Connector
FOR FUTURE USE
Fig. 1 Model AA41-2 / AA41-4 Modular Card Components
*“F1” is currently the only programmable filter tile that applies to the Model AA41.
Produktspezifikationen
| Marke: | Daytronic |
| Kategorie: | Nicht kategorisiert |
| Modell: | AA41-2F1 |
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