Ahlborn THERM 2420, Руководство по эксплуатации

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8. 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
Checksum error in
device calibration :
Sensor breakage : flashes
Outside of measuring range, undershoots
cold junction compensation or cold junc flashes
tion compensation breakage :
Function is locked : This appears
briefly
Overshoots measuring range : Maximum value flashes
Undershoots measuring range : Minimum value flashes
8.2 Keypad
To operate the device a keypad with 7 keys is provided :
Function : Key
To switch ON the device : (see Section 6.2)
ON OFF
To switch OFF the device :
ON OFF
must be
pressed and held down
Selecting the units : (see Section 9.2)
M▲
or
M▼
Displaying the maximum value : (see Section 9.3)
MAX
To delete press and hold down
Displaying the minimum value : (see Section 9.3)
MIN
To delete press and hold down
Zero-setting the measured value : (see Section 9.5)
CLR
To delete press and hold down
8 THERM 2420
CALEr
NiCr
CJ
Loc