1
G
ENERAL
D
ESCRIPTION AND
S
PECIFICATIONS
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
M
ODEL
AA41-2
M
ODEL
AA41-4
F
REQUENCY
I
NPUT
C
ONDITIONER
C
ARD
G
ENERAL
D
ESCRIPTION AND
S
PECIFICATIONS
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
S
YSTEM
10
A
NALOG
I
NPUT
C
ARDS
Summary of Contents for System 10
Page 31: ...GETTING YOUR SYSTEM 10 ON THE AIR SB 2 FOR A SIZED MAINFRAMES...
Page 67: ...GETTING YOUR SYSTEM 10 ON THE AIR SB 2 FOR B SIZED MAINFRAMES...
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Page 174: ...10A16 4C 6 THIS PAGE INTENTIONALLY BLANK 10A16 4C QUAD PLATINUM RTD CARD...
Page 186: ...10A18 4C 8 THIS PAGE INTENTIONALLY BLANK 10A18 4C QUAD PLATINUM LINEAR RTD CARD...
Page 212: ...10A40 8 THIS PAGE INTENTIONALLY BLANK 10A40 FREQUENCY CARD...
Page 224: ...10A43 4 THIS PAGE INTENTIONALLY BLANK 10A43 DWELL ANGLE CARD...
Page 234: ...10A48 6 THIS PAGE INTENTIONALLY BLANK 10A48 FLOW CARD...
Page 242: ...10A61 2 4 THIS PAGE INTENTIONALLY BLANK 10A61 2 DUAL 4 20 MA CARD...
Page 252: ...10A63 2 6 THIS PAGE INTENTIONALLY BLANK 10A63 2 DUAL DC VOLTAGE CARD...
Page 270: ...10A69 4 6 THIS PAGE INTENTIONALLY BLANK 10A69 4 QUAD AC RMS CARD...
Page 276: ...10A70 2 6 THIS PAGE INTENTIONALLY BLANK 10A70 2 DUAL DC STRAIN GAGE CARD...
Page 288: ...10A72 2C 12 THIS PAGE INTENTIONALLY BLANK 10A72 2C ENHANCED DUAL DC STRAIN GAGE CARD...
Page 320: ...10A74 4C 18 THIS PAGE INTENTIONALLY BLANK 10A74 4C QUAD DC STRAIN GAGE TRACK HOLD CARD...
Page 342: ...10A96 8 THIS PAGE INTENTIONALLY BLANK 10A96 AMPLIFIED ACCELEROMETER VIBRATION CARD...
Page 362: ...AA30 4 12 THIS PAGE INTENTIONALLY BLANK AA30 4 QUAD LVDT CARD...
Page 374: ...AA41 2 4 12 THIS PAGE INTENTIONALLY BLANK AA41 2 AA41 4 DUAL QUAD FREQUENCY CARD...
Page 390: ...AA72 2 4 16 THIS PAGE INTENTIONALLY BLANK AA72 2 AA72 4 DUAL QUAD DC STRAIN GAGE CARD...
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