3.4 Speaker
A piezo buzzer emits audible signals using the housing area among the four keys as a diaphragm, so that
no hole is required for a loudspeaker.
3.5 Keys
The top side carries four keys made of silicone rubber, which provide a clear tactile feel, and which can
be easily operated even with heavy working gloves. The keys are:
1. On/off key, symbol
2. Function key (arrow key) to select various functions, symbol
3. Illumination key, symbol
4. Signal key for audible signals and selecting alarm thresholds, symbol
3.6 Probe Socket
A socket on the left-hand side of the instrument serves to connect external probes. The probe connector is
equipped with a locking, which has to be observed when plugging or unplugging the connector, see
section 5.1.
03/2004
Operating Manual 6150AD
Page 7
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