Geonics Limited EM31-SH, Руководство по эксплуатации

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EM31-SH MANUAL Page
15
If, on the other hand, the difference in readings has
increased, the PHASE potentiometer should be rotated in a
counter clockwise direction instead and the procedure
described above repeated until there is no change in the
readings. Always remember to set the COARSE control back
to its original position. This can be confirmed by
checking that the inphase (I) reads zero with the mode
switch set to OPER mode. If it does not read zero, use
the coarse and fine compensation controls to obtain zero
of the inphase reading.
c) To check the sensitivity of the instrument, set the Mode
switch to the COMP position and rotate the COARSE control
clockwise one step. The conductivity reading should
change between 78 to 82 mS/m. It is unlikely that the
sensitivity of the instrument will vary, however, it may
be useful to record the actual reading for comparison at
a later date.
Return the COARSE switch to its original setting and set
the mode switch to OPER. The EM31 is now ready to make
ground conductivity measurements.
NOTE:
a) When conducting the functional tests over ground of
conductivity greater than 100 mS/m, the Range switch
should be set at the 1000 mS/m range. At whatever level
the Range switch is in, the reading taken in (c) should
still be between 78 and 82 mS/m.
b)
The maximum output range of the instrument is 20 mS/m or
200 mS/m, or 2,000 mS/m for conductivity component, and
6 ppt for inphase component.
c) At the end of the survey always remember to turn off both
data logger and main console