Honeywell VXP, System Maintenance Manual, Page: 26 / 105

1-16 Honeywell
Introduction
1.2.9 Photocell
The photocell is used primarily to generate a speed signal pulse for tail rotor smoothing. It consists
of a weather-tight optical probe housed in an all metal enclosure that transmits a modulated light
and receives the reflected signal. All connector pins, signal, power and return pins are filtered
behind the sensor contact. Leading particulars are provided in Table 1-9.
Max Flash Tube Energy Control Auto Range (no operator adjustment)
Effective Strobe Range Bright Sun - 60 ft (18.3 m)
Overcast - 150 ft (45.7 m)
Night - 500 ft (152.4 m)
Dimensions 6.0 H x 4.5 W x 5.0 L (inches
152.4 H x 114.3 W x 127.0 L (mm)
Weight 3.5 lb (1.59 kg)
Table 1-11. Photocell Leading Particulars
Parameter Characteristic
Supply Voltage 10-30 Vdc at less than 25mA (exclusive of
load). 10% maximum ripple
Response Time 300 microsecond (0.3 millisecond) duration
(independent of signal strength)
Light Beam Visible red (650 nm)
Operating Temperature Range -20° to +70° C (-4° to +158° F)
Table 1-10. Strobex Leading Particulars (Continued)
Parameter Characteristic