Sandia Aerospace ST26 - Manual (Page 3)

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