9. Display and keypad
Special operating states and faults
Display segment test :
runs automatically after switch ON
Supply voltage
Display after segment test
Under 3.8 V :
LOBAT
arrow lights up
Relative measuring with respect to a reference value :
REL
arrow lights up
Measured value corrected :
CORR
arrow lights up
Checksum error in
device calibration :
Non-connected sensors,
deactivated measuring points :
Measuring range / function not permitted :
Multiplexer M5 (D-B) is not permitted :
Sensor breakage :
flashes
Outside of measuring range, undershoots
cold junction compensation
flashes
or cold junction compensation breakage :
Overshoots values range (>65000) :
flashes
Overshoots measuring range :
Maximum value flashes
Undershoots measuring range :
Minimum value flashes
9.2 Keypad
To operate the device a keypad with 7 keys is provided :
Function :
Key
To switch ON
the device : (see Section 7.5)
ON OFF
To switch OFF
the device :
ON OFF
must be pressed and held down
18 ALMEMO
®
2450-1
CALEr
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