EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 13
SECTION 3
OPERATING INSTRUCTIONS
This section explains the essential functions performed by the EPD and describes
operating instructions that will allow the user to display data, acknowledge alarms
and operate the EPD.
3.1 LCD Display and Backlight
A custom-designed LCD display on the top of the EPD provides a visual interface for
viewing dose and other EPD data. The EPD display is illustrated in Figure 3.2, which
shows all segments in the on state. All segments are activated in this way
temporarily during the start-up sequence, and during user initiated Confidence Test,
(see Section 3.5.7). On completion of the start-up sequence or Confidence Test the
default display will appear.
The default display is preset at the factory to show Hp(10) (the penetrating or deep
dose), or another default display as specified by the customer. The default display
can also be changed by the customer after delivery, to any display shown in Figure
3.4. Default settings and other display controls are changed using a suitable IR
communications link and software (e.g. EasyEPD2). For example, the display can
be configured to display values in either Sieverts or rems.
The EPD is provided with many different displays in order to provide a powerful
‘stand-alone’ facility for users not having direct access to communications software
such as EasyEPD2. However for many users the sheer number of displays
available may lead to confusion and Thermo Electron has therefore provided a
facility for unwanted or unnecessary displays to be disabled.
Backlight Operation
The EPD is equipped with a display backlight to enable the display to be read in the
dark. The following points should be noted:
♦ The backlight will only function if it is enabled over the IR communications link.
♦ The backlight only operates for a short period after the button is pressed. This
is to conserve battery life.
♦ When the backlight is enabled but currently off, the first short press of the button
serves only to activate the backlight and does not cause a change of display
selection. This may cause confusion in bright day-time conditions when the
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