Recording Scheme

No Recipe

• How deep you want to go?

• What is the noise level?

• How conductive is the ground?

• How is the magnetic activity?

The only available recipe is: record as long as possible.

Hint

With a minimum recording frequency of 512 Hz you are always perfectly synchronized[1].

Fluxgate

The recording time should be at least one week for periods greater than 10,000 s.
Considering that with induction coils you can measure down to 4096 s, and you purchased a fluxgate, the guess is that you are interested in periods greater than 10,000 s.
So 40,000 s to 100,000 s are needed to get significantly deeper: 3 weeks of recording time is needed.

SHFT

The SHFT-02e and SHFT-03e are used for AMT/CSAMT. Your recording time should be at least 1 - 5  min. You are depending strongly on the magnetic activity.

Coils

First of all be aware that frequencies above 1 kHz are difficult to get (see above). In countries like Brasil you can be lucky, in countries like Germany you may sad

How deep?

This is a question which can not been answered directly. Learn that please.
Question: How far do I get when I drive for one hour on a motorway?
Answer: depends on our speed (aka conductivity) and traffic jam (aka noise level).
… it sounds cruel … but you have to respect two parameters to answer one question.

Table 2 recording_scheme

coil preferred	duration	application type	environment	periods	depth
MFS-06e	1-2 days	general studies / geothermal	sediments	1000s	3-6 km
MFS-06e	3-6 days	general studies	sediments	5000s	8-12 km
MFS-06e	1-2 days	general studies	rocks	1000s	8-15 km
MFS-06e	3-6 days	general studies	rocks	5000s	20-100 km
MFS-07e	1-2 days	general studies / geothermal	sediments	1000s	3-6 km
MFS-07e	1-2 days	general studies / geothermal	rocks	1000s	8-15 km
MFS-07e	8 hours	general studies / geothermal	sediments	100s	2-3 km
MFS-07e	8 hours	general studies / geothermal	rocks	100s	4-6 km
SHFT-02e	15 mins	environmental	normal soils	1 kHz	30-100 m

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[1]

the 256 Hz synchronicity is subject of being removed in the future. It is only for working with ADU-07e systems together. ADU-08e and higher may have an optionally different 256 Hz sync. So take 512 Hz as the default for long term recording.