POLIFEMO-RADIO
User manual
Doc: POL_R_200_006_E
Version: 2.0
Page
9
of
11
6. THE OUTPUTS
The Polifemo photocell emits a signal on the output, normally open, and is brought to the reference
level (COM socket – BLACK banana jack) if the infrared beam is interrupted The signal is
presented on the green banana jack (OUT2) and is compatible with every type of timing device.
6.1. OUTPUT
SIGNAL
The output signal has a minimum duration of 3 hundredths of a second and has a constant delay
relative to the event of a thousandth of a second. Of course the delay does not affect resolution,
which for Polifemo is 125
μ
s (0.125 milliseconds). The output level passes from high to low
(contact closes) and is kept in this situation until the end of the interruption of the infrared beam
Δ
T
Interruption of beam
Δ
T
Output signal
1 ms
1 ms
7. POWER SUPPLY
The Polifemo photocell can be powered in 2 different ways:
•
with batteries
•
from recharge power source
Before continuing, it would be better to make clear what the various terms mean:
•
batteries: Size AA batteries, both rechargeable and non-rechargeable types;
rechargeable:
both NiCd and NiMH 1.2V
non-rechargeable:
Alkaline 1.5V
•
recharge power source: power applied to recharge jack (see fig 1 n° 6). Voltage must be between
8V and 13V (we strongly advise you not to use voltages above 13V; for higher voltages a
security mechanism - varistor – breaks the supply circuit. The circuit is restored when voltage
has returned within the operative range).
Polifemo can manage both types of power supply simultaneously. If the photocell is on and
powered from an external power source or from a recharge power source, the batteries are protected
by using 'external' power sources; moreover, if recharge power is sufficient, the batteries are kept
charged by a recharge current with a suitable duty cycle.
