Gen II User Manual
4-3 – Propeller Balance Chapter 4 Revision 2.2, Apr 2020
Phototach
The Phototach is a short-range optical sensor used in acquiring speed and phase angle data. Its
optimum range is 12 to 18 inches from the target (reflective tape, 3M 7610). It is supplied with a
three-inch by three-inch base. An optional camera-type swivel mount is available from ACES
Systems.
Hardware (screw, nut, and washers) for assembly of the supplied mount is contained in the tackle
box which is also supplied with the propeller balance kit. The three-pin MS connector attaches
directly to the Phototach cable. Other speed/phase sensors that can be used with the analyzer can
be purchased separately. They include the ACES Systems’ LASETACH, Magnetic Interrupter,
or specific-application speed interfaces. Call ACES Systems for further information.
Tachometer Sensor Cable
The tachometer sensor cable connects the analyzer to a Phototach, an ACES Systems’
LASETACH

, or an interface for optional speed sensors such as a magnetic pickup or pulse
generator. The cable is a three-wire shielded cable, insulated in a bright yellow, petroleum-
resistant jacket. Attached to one end of the cable is a female three-pin bulkhead-type socket
connector. On the opposite end of the cable is a male three-pin, quarter-turn-locking MS
connector. The connectors are constructed of aluminum alloy with olive drab chromate coating
for corrosion resistance. The male end connects to the tach input of any ACES Systems’
analyzer/balancer or to the female end of another cable of the same type. The opposite (female,
bulkhead) end will accept another 10-320-0126 cable for extension or connect to an aircraft or
sensor interface. There are 50-ft. and 25-ft. variants of this cable. The 25-ft. cable was built
generally for propeller balancing applications, which normally require less distance to the
sensors. LASETACHs (Part Number: 10-100-1300) and Phototachs (Part Number: 10-100-
1773) have a socket connector that connects directly to the bulkhead connector end of this cable.
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