Geonics Limited EM31-SH, Руководство по эксплуатации

Страница: 21 / 49

EM31-SH MANUAL Page
17
When taking horizontal measurements only or both
horizontal and vertical dipole measurements together the
measurements should be taken at ground level.
To take the horizontal dipole measurements rotate the
EM31 90° about the long axis so that the console is
facing horizontally and the battery pack is on the up
side.
c)
When collecting discreet data points the operator can
extend battery life by turning the instrument off between
stations. In this case, the operator will notice a slight
initial overshoot of the display at turn on. This is
normal, and at least two seconds should be allowed after
initial turn on before the measurement is recorded.
Alternatively, the operator may choose to leave the
instrument on and watch for anomalous reading between
data points. The instrument, however, has a time
constant of about one second for which the operator
should adjust his walking speed to obtain greatest
accuracy.
Again, the effect of the instrument time constant should
be recognized while logging. Fiducial marks can be
placed within the data as fixed points of reference.
The orange button on the transmitter boom is used only in
conjunction with the data recording system.
It is also possible to collect data with the use of
computer, by connecting the computer directly to the RS-
232 output port on the EM31-SH front panel (with optional
RS-232 interconnect cable). See DAT31-MK2 computer
program manual, section 7, Real Time Logging.