Gauss-/Teslameter
FH 52
BA - Nr.: 1620010102
Page 24
Fig. 12: Power Off menu
The automatic
Power Off
function is not active if the FH 52 is powered from the USB.
3.3.16
Test Menu
When the
Test
menu is invoked, the FH 52 will carry out some self-tests. The results of the tests
are shown.
Fig. 13: Test menu
First the
Offset
of the probe that was obtained during the last run of the
Zero
is shown. An
offset with an absolute value of more than 20 mT can indicate that the probe is defective. If a
high offset is shown you should first check if the plug of the probe is properly inserted. Then
leave the menu and carry out
Zero
again. Check the result in the
Test
menu. Please also take
notice of the hints in chapter 4.4.
Secondly the
Voltage
path of the probe is checked. If no probe is connected or if the voltage
path is interrupted, “
open
” is shown. If “
OK
” is shown, the voltage path is operational.
For third the probe
Current
is measured. It should be about 1 mA. Small deviations (up to
approx. 5 %) are automatically corrected by the FH 52. A probe current that is much too small
can indicate damage to the sensor. A probe current of 0 mA is shown if no probe is connected
or if the current path is interrupted, i.e. the probe is defective.
At last the probe memory (
Eeprom
) is checked. “
Missing
” is shown if no memory is detected. If
a memory is present, a check of the cyclic redundancy of the data is carried out (CRC). On
success “
OK
” is shown, otherwise “
CRC error
”.
3.3.17
Measuring Data Memory
Up to 120 measured values can be saved to the measuring data memory of the FH 52. These are
also kept in memory when the device is switched of. Saving is carried out during the measuring
