Sandia Aerospace ST26 User Manual

ST 26

Tach Generator Adapter

SANDIA aerospace
Albuquerque, New Mexico

www.sandia.aero

305662-00-IS

The document and the information contained herein is the proprietary data of SANDIA aerospace, Inc. No part
of this document may be transmitted, reproduced or copied in any form or by any means without the prior writ­ten consent of SANDIA aerospace, Inc. Due to SANDIA aerospace’s continued product and quality improve­ment programs, information contained in this document is the subject to change without prior notice. Copyright
2011 SANDIA aerospace, Inc. All rights reserved. Printed in USA

reCOrd Of revisiOns

Revision Date Description Approval

A 20061208 DRN289 J. Fiala
B 20120625 ECN3915 L. Harrison

C 20130702 ECN3989 L. Harrison

Table Of COnTenTs

Record of Revision ............................................................................................................1

Table of Contents ...............................................................................................................1

Section 1 General Description ..........................................................................................................1

1.1 Introduction .......................................................................................................................2

1.2 Product Description ..........................................................................................................2

1.3 Technical Characteristics ..................................................................................................2

1.3.1 Physical Characteristics .................................................................................................... 2

1.3.2 Operational Characteristics .............................................................................................2

1.3.3 Approved Equipment ........................................................................................................ 2

1.3.4 Certication .......................................................................................................................4

Section 2 Installation Considerations...............................................................................................4

2.1 Introduction .......................................................................................................................5

2.2 Mounting Considerations .................................................................................................5

2.3 Cooling................................................................................................................................5

Section 3 Installation Procedures .....................................................................................................6

3.1 General ...............................................................................................................................6

3.2 Equipment Required ......................................................................................................... 6

3.2.1 Supplied .............................................................................................................................. 6

3.2.2 Required But Not Supplied ..............................................................................................6

3.3 Mounting ............................................................................................................................ 6

3.4 Electrical ............................................................................................................................7

3.5 Operating Instructions and Limitations .........................................................................7

3.6 Calibration .........................................................................................................................7

3.7 Continued Airworthiness .................................................................................................. 7

lisT Of illusTraTiOns

Figure1ST26QualicationTestForm ............................................................................................ 4

Figure 2 Dimensional Outline Drawing ........................................................................................... 6

Figure 3 Interconnect Diagram ........................................................................................................ 7

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ST 26
Tach Generator Adapter

SECTION 1

GENERAL DESCRIPTION

1.1 inTrOduCTiOn

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

certied 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 PrOduCT desCriPTiOn

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 TeChniCal CharaCTerisTiCs

1.3.1 PhysiCal CharaCTerisTiCs

Width 5.06” Height .99”
Depth 3.35” Weight 0.5 lb

1.3.2 OPeraTiOnal CharaCTerisTiCs

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 aPPrOved equiPmenT

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

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