10. Device configuration
10.3 Function locking
Since there is a risk that the measuring functions or relative measuring opera-
tions may lead to misinterpretation, these are normally locked at level 3. These
can, however, be individually enabled via menu item ´
Loc
´ :
Loc
parameter
Locked functions
0
None
1
Measuring functions (the previously selected function is retained)
2
Relative measuring
3
Measuring functions and relative measuring (default)
11. TROUBLE-SHOOTING
The THERM 2420 measuring instrument can be configured. If in certain cir-
cumstances the device does not respond exactly as it should, the cause of
such unexpected behavior is only very rarely a device defect; more usually it is
incorrect operation by the user, an invalid setting, or unsuitable cabling. In such
event try to pinpoint and clear the problem with the aid of the following tests.
Error:
No display, display malfunction, keys do not react
Remedy:
Check the power supply, charge the battery, switch off and then on
again. If necessary, re-initialize; (see 6.2).
Error:
Measuring functions or relative measuring cannot be started.
Remedy:
Check device configuration; see 10, 10.3
Error:
Measured values are incorrect.
Remedy:
Switch Device OFF / ON, press key and hold
CLR
.
Check measur-
ing range configuration; see 10
Error:
Fluctuating measured values or the system hangs in mid-operation.
Remedy:
Check connecting cable(s), connect hand-held sensors in air or
phantoms (for thermocouples short-circuit) and check.
Then reconnect the sensor and check; if necessary, insulate the sen-
sor and eliminate interference by using shielded or twisted wiring.
Error:
´
CALEr
´
is displayed when the device is switched on.
Remedy:
The calibration of a measuring range may have become misadjust-
ed. The device must be recalibrated at the factory.
If, after performing the above-listed checks and remedial steps, the device still
fails to behave as described in the operating instructions, it must be returned to
our factory in Holzkirchen, accompanied by an explanatory note and error de-
scription.
12 THERM 2420
