NATURAL SOURCE MAGNETOTELLURICS
Section 13, Page 29 May 2002
There can be up to 8 individual time schedule entries as shown in the above display. All entries
are executed in the order shown in the menu.
Start Time. The time entered here determines when the automatic time schedule for
data acquisition begins.
Total Time. The sum of the times entered under the Duration column. This sum is
automatically calculated and inserted as shown below.
Freq Band. Very high, high, medium and low frequency bands, as listed in Section 1 of this
manual, are selected by using the
Home
SELECT UP
and
SELECT DN
End
keys. The low frequency band is further
selected by changing the number of levels in the Levels column.
Duration. This is the time, in minutes, specified for data acquisition for each frequency
band. If Duration is set to 0 for an entry, that entry will not be run. When the program
reaches the last entry, it will automatically go back to the top of the schedule and start over.
Stacks. The number of stacks to be acquired for each frequency band.
Levels. This column is fixed at 5 for all frequency bands except the lowest. The default
value for the low frequency band is 5 also (0.1875 - 4 Hz). Changing the levels for the low
frequency band changes the frequency band automatically, and can be done by either using the
Home
SELECT UP
and
SELECT DN
End
keys or by entering the level from the numeric keypad.
ExtAmp. If
is pressed while the cursor is in the Start Time field, then the
default external amplifier menu will be displayed. This allows the user to input external
amplifier settings that will be used for ALL TIME SCHEDULE ENTRIES.
When the time schedule cursor is in any other field, the External Amplifier Menu can be called
up by pressing . This will permit changing the parameters for external amplifier gains
for that particular Frequency Band entry only.
Notice that each frequency band entry can have separate external amplifier settings. Make sure
the correct gain value is input to obtain the correct resistivity values.
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