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Sandia Aerospace ST26 User Manual

Page 3

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SECTION 1

GENERAL DESCRIPTION

1.1

i

nTrOduCTiOn

This sheet describes the installation of the ST 26 Tach Generator Adapter. It is intended for use by FAA

certified repair stations and original equipment manufacturers (OEM’s) to install the ST 26 and includes

both mechanical and electrical installation information. The installer should insure that the ST 26 is

operating according to its intended function.

1.2

P

rOduCT

d

esCriPTiOn

The ST 26 is a Tach Generator Adapter that converts the sinusoidal output of Tach Generator to a digital

format that can be used by aircraft display and/or control systems.

1.3

T

eChniCal

C

haraCTerisTiCs

1.3.1 P

hysiCal

C

haraCTerisTiCs

Width 5.06” Height .99”

Depth 3.35” Weight 0.5 lb

1.3.2 O

PeraTiOnal

C

haraCTerisTiCs

Operating Voltage

11-33Vdc

Current

.10 Amps per channel (.40 Amps total all channels)

Operating Temp

-55o C to +70oC

Max Operating Altitude

55,000 Feet

1.3.3 a

PPrOved

e

quiPmenT

The ST 26 requires the following input from the on-board Tach Generator.

Signal:

Sinusoidal

Signal Frequency Range:

4-100Hz

Signal Amplitude Range:

4.25-150VPP

Approved Tachometers include:

Globe

22A703

AAE

32005-007

Electro-Mech

EM-8001

Mikrotechna LUN 1333.12-8

The ST 26 digital output signal is:

Pulled up collector to aircraft power

Rise time is 15 uS nominal to Aircraft power @ 5VPP

Fall time is 10uS nominal @ 5VPP

Low voltage: 0.5VDC, 370 ohm

High Voltage: Aircraft power through 4.7 K Ohm

Approved Systems include:

Garmin G900X, G1000 Integrated Avionics Systems

2

ST 26

Tach Generator Adapter