Olympus TH4, Instructions Manual, Page: 14 / 24

11
Fig. 6
2 Remote ON/OFF Operation (Fig. 6)
}The lamp can be turned off by shorting pins 4 and 2 of the DIN 8-pin
connector.
# The external wiring should have a wire gauge of AWG28 (0.1 mm
2
) or
more.
# The external contact should be fully capable of switching 10 mA on
and off.
# When the lamp is to be turned on/off with the open collector, connect
the emitter to pin 2.
Fig. 7
3 Controlling the Amount of Light with External VR (Fig. 7)
Inside the power
supply unit
}The amount of light can be controlled between MIN and MAX by connect-
ing an external VR.
1. Connect a VR as shown in Fig. 7.
2. Set the main switch to “
I ” (ON).
3. The amount of light is minimized when the voltage at pin 1 is 0 V and
maximized when it is +5 V.
# The external wiring should have a wire gauge of AWG28 (0.1 mm 2 ) or
more.
# Use an external VR of 10 0.1 W.
+5 V
ANALOG IN
6
1
4
2
4
Inside the power
supply unit
5.1 V
Vcc (13.5 V)
10
4.7