2
Battery Replacement
Each unit comes equipped with a 9 V Lithium battery that provides power to the unit for approximately
30 hours of operation. It is recommended that the battery be replaced whenever the output signal
becomes clipped at 1 volt or less. When replacing the battery,
a Lithium unit should be used. Conventional 9 V alkaline batteries may be used if so desired but the
useful life will only be about 25
% ( 8 hours) of that of the much higher capacity Lithium types. TTI can supply these batteries if de-
sired. Replacement of the battery may be accomplished by removing the four 2-56 Philips
fl
at head
screws that retain the bottom cover of the TIA-527.
DO NOT
attempt to remove the top cover. Take
care to replace all screws tightly. This will provide optimum shielding of the unit from ambient radio
frequency noise or interference.
The TIA-527 is also supplied with a universal power supply that operates from 90 to 240 VAC, 50-60
Hz. Each unit is equipped with four interchangeable power plugs that equip the unit for use in North
America, Europe, the UK or Australia. Plugging the power supply into the unit disconnects the internal
battery.
Controls
Selects
transimpedance
of
fi
rst stage
Selects inter-
stage
coupling
Applies power
to the unit
Optical Input
Connectors
Selects gain of
second stage
