Helicopters Magazine

Current transducers offer fast broadband response

November 8, 2010  By Carey Fredericks

Nov. 8, 2010, Farmingdale, N.Y. - American Aerospace Controls has released a series of bi-directional current transducers capable of accurately following extremely fast (DC and/or AC) current waveforms. The 929 Series consumes a very low 80 to 270 mW during operation, and provides an ultra fast response (less than a micro second) to complex current waveforms in the range of DC to 350 kHz, making the transducers ideally suited for demanding environments where high speed current monitoring is needed.

The transducer offers superior accuracy (+/-1.0% FS) over a wide temperature range -40°C to 85°C (-40°F to 185°F).
The 929 Series features a compact, rugged, flame-retardant package that
measures only 1.9” x 3.3” x 1.9” (48 mm x 84 mm x 48 mm) and weighs only
6 oz. (170 grams) maximum. The units can be powered by any DC voltage
within the range of +10VDC to +34 VDC, eliminating the need for a
negative power source. During normal operation and at overloads up to +/- 5,000 ADC, the transducer draws a maximum of 8mADC.
The unit’s input power connection can withstand a +/-60 V transient
power surge (T < 5 m-sec), and is reverse polarity and short circuit
protected. The unit’s output is capable of following IGBT currents from
DC to 350 kHz with an output load of 5 k&#937; to infinity, and an
output impedance of 25&#937;.

This transducer features excellent environmental characteristics to endure harsh operational conditions.
Internal circuitry is epoxy encapsulated to increase insulation (500
M&#937; @ 500 VDC), and to protect the unit from moisture and
foreign contaminants. In addition, the transducer’s case is manufactured
from a molded plastic that tolerates very high temperatures, meets the
UL94V-0 flammability rating, and allows the 929 Series to withstand
random vibration levels per MIL-STD-810F of 12.0 G-RMS and shock of 50 g
11 m-sec half sine pulse.

The 929 Series is available in eight models with input current ranges from 0 ADC to +/- ADC through 0 ADC to +/-400 ADC.
The transducers come standard with five-pin terminal barrier and a 0.75”
(20 mm) pass-through aperture; optional six-pin connectors or nine-pin
D-Sub connectors are also available. For more information visit, www.a-a-c.com.



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