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- “Audio and visual” or “audio” clearing of an alarm
- Exit from a current menu
- Start a self-test manually
- VALIDATE
4.1.2. Maintenance keys
PROGRAMMING key (Fig 4 item D): accessible after opening and swivelling the front panel.
- Combined with the “-” key to go back in a menu.
- To quit normal display mode and access the various menus (see block diagram of
the various menus).
- To scroll through a menu.
CALIBRATION key (Fig 4 item C) : accessible after opening and swivelling the front panel.
- To set a channel to CALIBRATION mode.
- To quit that mode.
4.1.3. Potentiometers
Each measuring channel has 5 potentiometers. These are accessible by opening and swivelling the
FRONT panel of the MX48 unit and are laid out as follows (see Fig. 5):
1 detector ZERO potentiometer
1 detector sensitivity potentiometer
1 potentiometer 4 mA / current output
1 potentiometer 20 mA / current output (for full scale)
1 potentiometer filaments power supply (340 mA)
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